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In-situ investigation of atmospheric corrosion behavior of bronze under thin electrolyte layers using electrochemical technique 被引量:6
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作者 廖晓宁 曹发和 +3 位作者 陈安娜 刘文娟 张鉴清 曹楚南 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第5期1239-1249,共11页
The atmospheric corrosion behavior of bronze under thin electrolyte layer (TEL) with different thicknesses was monitored using cathodic polarization curves, open circuit potential (OCP) and electrochemical impedan... The atmospheric corrosion behavior of bronze under thin electrolyte layer (TEL) with different thicknesses was monitored using cathodic polarization curves, open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS). Cathodic polarization result indicates that the cathodic limiting current density increases with decreasing the TEL thickness. EIS result shows that the corrosion rate increases with decreasing the TEL thickness at the initial stage because the corrosion is dominated by the cathodic process, whereas after long immersion time, the corrosion degree with the TEL thickness is in the sequence of 150 μm 〉 310 μm〉 10μm ≈ bulk solution 〉 57 μm. The measurements of OCP and EIS present in-situ electrochemical corrosion information and their results are in good agreement with that of physical characterizations. 展开更多
关键词 BRONZE thin electrolyte layer in-situ investigation atmospheric corrosion electrochemical technique
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Corrosion Measurements of Reinforcing Steel by Different Electrochemical Techniques 被引量:1
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作者 S.M.Morsy (Metallurgy Dept. Nuclear Research Center, Atomic Energy Authority, Cairo, Egypt) I.Z.Selim (Physical Chemistry Dept., National Research Center, Dokki, Cairo, Egypt)S. H. Tantawi (Building Research Institute, Dokki, Cairo, Egypt) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1995年第6期447-451,共5页
Electrochemical techniques of the corrosion measurements of reinforcing steeI in concrete have been evaluated. These techniques include half-cell potential measurements, impressed voltage method, impressed current met... Electrochemical techniques of the corrosion measurements of reinforcing steeI in concrete have been evaluated. These techniques include half-cell potential measurements, impressed voltage method, impressed current method and potentiostatic polarization technique. The results of corrosion behaviour of the steel in both 5%NaCl and 5%MgSO4 show that each electrochemical technique provides some information about the condition of the steel bar or the corrosivity of the environment being evaluated, yet none provides a complete data regarding the corrosion resistance of reinforcing steel in aggressive media 展开更多
关键词 Corrosion Measurements of Reinforcing Steel by Different electrochemical techniques
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Nanometeric hydroxyapatite in situ formed in demineralized bone matrix by electrochemical technique
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《Chinese Journal of Biomedical Engineering(English Edition)》 2001年第3期130-132,共3页
关键词 BONE Nanometeric hydroxyapatite in situ formed in demineralized bone matrix by electrochemical technique DBM
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Crevice Corrosion Performance of 436 Ferritic Stainless Steel Studied by Different Electrochemical Techniques in Sodium Chloride Solutions with Sulfate Addition 被引量:1
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作者 Jia-Ming Wang Sheng-Sheng Qian +3 位作者 Yuan-Yuan Liu Yang-Ting Sun Yi-Ming Jiang Jin Li 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2018年第8期815-822,共8页
The crevice corrosion behaviors of 436 stainless steels in chloride-containing solutions with sulfate addition were studied using potentiodynamic, galvanostatic and repassivation potential measurements. The results of... The crevice corrosion behaviors of 436 stainless steels in chloride-containing solutions with sulfate addition were studied using potentiodynamic, galvanostatic and repassivation potential measurements. The results of these electrochemical tests were compared and discussed. Galvanostatic test was proved to be the most powerful technique in detecting the crevice corrosion of 436 stainless steels, while the repassivation potential measurement was the most time-saving method in this study. Sulfate ions have inhibited the crevice corrosion of 436 stainless steels in chloride-containing solution, which may result from the effects of competitive adsorption and the IR drop mechanism. 展开更多
关键词 Crevice corrosion Ferritic stainless steels electrochemical techniques Sulfate ions Competitive adsorption IR drop mechanism
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Electrochemical deposition of Mg(OH)_(2)/GO composite films for corrosion protection of magnesium alloys 被引量:6
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作者 Fengxia Wu Jun Liang Weixue Li 《Journal of Magnesium and Alloys》 SCIE EI CAS 2015年第3期231-236,共6页
Mg(OH)_(2)/graphene oxide(GO)composite film was electrochemical deposited on AZ91D magnesium alloys at constant potential.The characteristics of the Mg(OH)_(2)/GO composite film were investigated by scanning electron ... Mg(OH)_(2)/graphene oxide(GO)composite film was electrochemical deposited on AZ91D magnesium alloys at constant potential.The characteristics of the Mg(OH)_(2)/GO composite film were investigated by scanning electron microscope(SEM),energy-dispersive X-ray spectrometry(EDS),X-ray diffractometer(XRD)and Raman spectroscopy.It was shown that the flaky GO randomly distributed in the composite film.Compared with the Mg(OH)_(2)film,the Mg(OH)_(2)/GO composite film exhibited more uniform and compact structure.Potentiodynamic polarization tests revealed that the Mg(OH)_(2)/GO composite film could significantly improve the corrosion resistance of Mg(OH)_(2)film with an obvious positive shift of corrosion potential by 0.19 V and a dramatic reduction of corrosion current density by more than one order of magnitude. 展开更多
关键词 Thin films COATING electrochemical techniques Corrosion
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Electrochemical hydrogen storage performance of AB_(5-)CoB composites synthesized by a simple mixing method 被引量:2
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作者 SONG Dawei WANG Yijing WANG Yaping JIAO Lifang YUAN Huatang 《Rare Metals》 SCIE EI CAS CSCD 2009年第6期629-632,共4页
AB5 (MlNi4.0Al0.3Cu0.5Zn0.2) alloy and CoB alloy were prepared by arc melting. AB5-CoB composites were synthesized by simple mixing of AB5 alloy powders and CoB alloy powders, and their electrochemical hydrogen stor... AB5 (MlNi4.0Al0.3Cu0.5Zn0.2) alloy and CoB alloy were prepared by arc melting. AB5-CoB composites were synthesized by simple mixing of AB5 alloy powders and CoB alloy powders, and their electrochemical hydrogen storage properties were studied as negative electrodes in KOH aqueous solution. The maximum discharge capacity of the AB5-CoB(50%) composite (the content of CoB in the composite is 50 wt.%) reached 365.3 mAh.g^-1. After 100 charge-discharge cycles, the discharge capacity of the AB5-CoB(50%) composite was still much higher than that of the AB5 alloy. The high rate discharge capability (HRD) and potentiodynamic polarization were also tested. 展开更多
关键词 composite materials powder metallurgy electrochemical techniques electrochemical properties
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Combined electronic/atomic level computational, surface(SEM/EDS),chemical and electrochemical studies of the mild steel surface by quinoxalines derivatives anti-corrosion properties in 1 mol·L^(-1) HCl solution 被引量:2
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作者 F.Benhiba Z.Benzekri +6 位作者 A.Guenbour M.Tabyaoui A.Bellaouchou S.Boukhris H.Oudda I.Warad A.Zarrouk 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第5期1436-1458,共23页
This work is devoted to the study of the inhibition of corrosion of mild steel(MS)in molar hydrochloric acid(1 mol·L-1 HCl)by two named quinoxaline derivatives namely,2-(2,4-dichlorophenyl)-1,4-dihydroquinoxaline... This work is devoted to the study of the inhibition of corrosion of mild steel(MS)in molar hydrochloric acid(1 mol·L-1 HCl)by two named quinoxaline derivatives namely,2-(2,4-dichlorophenyl)-1,4-dihydroquinoxaline(HQ)and 2-(2,4-dichlorophenyl)-6-methyl-1,4-dihydroquinoxaline(CQ).The inhibitory efficacy of HQ and CQ compounds is first evaluated using the gravimetric method and using electrochemical techniques(stationary and transient techniques).The results showed that our compounds are efficient corrosion inhibitors and the inhibition rates(ηEIS%)reached up to 91%and 94.2%at 10-3 mol·L-1 for HQ and CQ,respectively.The mentioned molecules are classified as mixed-type inhibitors.The adsorption of these inhibitors on the surface of steel in hydrochloric HCl 1 mol·L-1 medium obeys the Langmuir adsorption isotherm.The results of the scanning electron microscope(SEM)showed the formation of a protective film on the surface of the steel in the presence of the inhibitors studied.Elementary analysis is obtained by energy dispersive X-ray spectroscopy(EDS).The inhibition property was further elucidated by theoretical approaches such as:Density Functional Theory(DFT),quantum chemical descriptors(QCD),local reactive indices,solvent effect,theoretical complexation,Molecular Dynamic(MD)simulation,effect of temperature on adsorption energy(Eads),Radial Distribution Function(RDF),and Mean Square Displacement(MSD).The results of these approaches support the experimental results. 展开更多
关键词 Mild steel corrosion Quinoxaline derivatives electrochemical techniques SEM/EDS MD
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Electrochemical and Theoretical Studies of 1-Alkyl-2-substituted Benzimidazoles as Corrosion Inhibitors for Carbon Steel Surface in HCl Medium 被引量:1
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作者 施红 徐斌 朱红军 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2016年第12期1829-1839,共11页
The inhibition efficiencies of newly synthesized four 1-alkyl-2-substituted benzimidazole compounds(a^d) have been studied for the corrosion of carbon steel in 1.0 M HCl by using potentiodynamic polarization measure... The inhibition efficiencies of newly synthesized four 1-alkyl-2-substituted benzimidazole compounds(a^d) have been studied for the corrosion of carbon steel in 1.0 M HCl by using potentiodynamic polarization measurement. The four inhibitors act as mixed-type inhibitors,which mainly inhibit cathodes. The inhibition efficiency of these compounds enhanced when the concentration of the inhibitors increased. A theoretical study of the corrosion inhibition efficiency of these compounds was carried out by using the B3 LYP level with the 6-31+G* basis set. Considering the solvent effect,the IEFPCM model was selected. Furthermore,the adsorption energies of the inhibitors with the iron(001) surface were studied by using molecular dynamic(MD) simulations. The theoretical results show that these inhibitors all exhibit several adsorption active-centers. Meanwhile,the MD simulations indicate that the adsorption occurs mostly through benzene ring and the lone pair electrons of the nitro atoms. These results demonstrated that the theoretical studies and MD simulations are reliable and promising methods for analyzing the inhibition efficiency of organic inhibitors. 展开更多
关键词 benzimidazole electrochemical techniques inhibitor DFT molecular dynamic
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Assembly and electrochemical testing of renewable carbon-based anodes in SIBs:A practical guide
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作者 Darío Alvira Daniel Antorán Joan JManyà 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第12期457-477,I0012,共22页
Sodium-ion batteries(SIBs)are considered as a promising candidate to replace lithium-ion batteries(LIBs)in large-scale energy storage applications.Abundant sodium resources and similar working principles make this tec... Sodium-ion batteries(SIBs)are considered as a promising candidate to replace lithium-ion batteries(LIBs)in large-scale energy storage applications.Abundant sodium resources and similar working principles make this technology attractive to be implemented in the near future.However,the development of high-performance carbon anodes is a focal point to the upcoming success of SIBs in terms of power density,cycling stability,and lifespan.Fundamental knowledge in electrochemical and physicochemical techniques is required to properly evaluate the anode performance and move it in the right direction.This review aims at providing a comprehensive guideline to help researchers from different backgrounds(e.g.,nanomaterials and thermochemistry)to delve into this topic.The main components,lab configurations,procedures,and working principles of SIBs are summarized.Moreover,a detailed description of the most used electrochemical and physicochemical techniques to characterize electrochemically active materials is provided. 展开更多
关键词 Sodium-ion battery ANODE Hard carbon electrochemical techniques Carbon characterization
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A New Approach for the Determination of Metronidazole Using Switchable Solvent Coupled with Au-MWCNTs-Modified Electrochemical Sensor
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作者 Siamak Kiani Shahvandi Mehrorang Ghaedi Hamid Ahmar 《Journal of Analysis and Testing》 EI CSCD 2024年第2期191-200,共10页
In this work,a new liquid-phase microextraction method coupled with an electrochemical technique using a switchable solvent was proposed for the determination of metronidazole.The extraction solvent used was dipropyla... In this work,a new liquid-phase microextraction method coupled with an electrochemical technique using a switchable solvent was proposed for the determination of metronidazole.The extraction solvent used was dipropylamine(DPA),which exhibited switchable hydrophilicity.This means that it can become miscible or immiscible when in contact with carboxylic acids in the aqueous sample.The metronidazole was then measured using a glassy carbon electrode that was modified with Au-multiwalled carbon nanotubes(MWCNTs).The eff ect of diff erent parameters such as the type and amount of trigger,the addition of salt,and the volume of extraction solvent on the e fficiency of switchable hydrophilic solvent-based liquid-phase microextraction(SHS-LPME)was investigated using the one-factor-at-a-time method.After optimizing the conditions,the linear calibration curve was obtained in the concentration range of 0.005–250μmol/L.Accordingly,the limit of quantification(LOQ)of 0.005μmol/L and the limit of detection(LOD)of 0.0015μmol/L were obtained,respectively. 展开更多
关键词 Switchable solvent METRONIDAZOLE Liquid-phase microextraction electrochemical techniques
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Corrosion behavior of micro-arc oxidation coating on AZ91D magnesium alloy in NaCl solutions with different concentrations 被引量:13
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作者 郭惠霞 马颖 +3 位作者 王劲松 王宇顺 董海荣 郝远 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第7期1786-1793,共8页
Ceramic oxide coatings were prepared on AZ91D magnesium alloys in alkaline silicate solution using micro-arc oxidation(MAO) technique.The corrosion behavior of MAO coating on AZ91D magnesium alloys in NaCl solutions... Ceramic oxide coatings were prepared on AZ91D magnesium alloys in alkaline silicate solution using micro-arc oxidation(MAO) technique.The corrosion behavior of MAO coating on AZ91D magnesium alloys in NaCl solutions with different concentrations(0.1%,0.5%,1.0%,3.5% and 5.0% in mass fraction) was evaluated by electrochemical measurements and immersion tests.The results showed that the corrosion rate of the MAO coated AZ91D increased with increasing chloride ion concentration.The main form of corrosion failure was localized corrosion for the MAO coated AZ91D immersed in higher concentration NaCl solutions(1.0%,3.5% and 5.0%),while it was general corrosion in dilute NaCl solutions(0.1% and 0.5%).Two different stages of the failure process of the MAO coated AZ91D could be identified:1) occurrence of the metastable pits and 2) growth of the pits.Different equivalent circuits were also proposed based on the results of electrochemical impedance spectroscopy(EIS) for the MAO coated AZ91D immersed in different concentrations of NaCl solutions for 120 h. 展开更多
关键词 micro-arc oxidation coating AZ91D magnesium alloy corrosion behavior chloride ion concentration electrochemical techniques
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Eco-friendly corrosion inhibitor from Pennisetum purpureum biomass and synergistic intensifiers for mild steel 被引量:8
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作者 Ekemini Ituen Abosede James +1 位作者 Onyewuchi Akaranta Shuangqin Sun 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第10期1442-1447,共6页
Extracts of elephant grass (Penniseturn purpureum) blended with some intensifier halides like ammonium chloride (AMC) and potassium iodide (PTI) were investigated as corrosion inhibitor for mild steel. The corro... Extracts of elephant grass (Penniseturn purpureum) blended with some intensifier halides like ammonium chloride (AMC) and potassium iodide (PTI) were investigated as corrosion inhibitor for mild steel. The corrosion process was monitored in 3.5% HCI by mass loss and electrochemical techniques at 30, 40, 50, 60 and 90 ℃. Addition of AMC and PTI increased the inhibition efficiency with the highest inhibition efficiency obtained with PTI blend- ed extract. The blends behaved as mixed type inhibitors and were spontaneously adsorbed on mild steel surface in exothermic nature. Synergistic parameters of the intensifier ions revealed cooperative effect. Kinetic data treatment indicated increase in energy barrier by intensifier ions. The results demonstrate that elephant grass extract blended with halide ions can act as alternative ecofriendly inhibitor for mild steel at elevated temperatures. 展开更多
关键词 Adsorption Charge transfer resistance Corrosion inhibitor formulations electrochemical techniques Elephant grass
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Capsella bursa-pastoris extract as an eco-friendly inhibitor on the corrosion of Q235 carbon steels in 1 mol·L^(-1) hydrochloric acid 被引量:4
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作者 胡琴 邱于兵 +1 位作者 张国安 郭兴蓬 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第8期1408-1415,共8页
The corrosion inhibition effect of Capsella bursa-pastoris extracts(CBE) for Q235 carbon steels in 1 mol·L-1hydrochloric acid solution was studied using electrochemical methods, environmental scanning electron mi... The corrosion inhibition effect of Capsella bursa-pastoris extracts(CBE) for Q235 carbon steels in 1 mol·L-1hydrochloric acid solution was studied using electrochemical methods, environmental scanning electron microscopy(SEM) and Raman microscopy analysis. The polarization plots indicate that CBE serves as an effective, mixedtype inhibitor. Linear polarization resistance shows that increasing CBE concentration and temperature results in increased inhibition ef ficiency. The highest inhibition ef ficiency can reach 97% when adding 60 mg·L-1CBE,which is better than some reported plant extracts under the similar environment. The adsorption of CBE molecules is found to obey the Langmuir adsorption isotherm. Some thermodynamic and kinetic parameters for the adsorption process, such as the adsorption equilibrium constant(K), free energy of adsorption(ΔG ads), activation energy of corrosion reaction(E a) and the heat of adsorption(Q ads), are calculated and discussed. SEM and Raman microscopy analysis also demonstrate the formation of a CBE inhibition film on the metal surface. 展开更多
关键词 Biomaterial Corrosion inhibitor electrochemical technique SEM Raman spectroscopy
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Coulometric determination of sulfur speciation in natural waters
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作者 Li Yuxian Zeng Yu Yan Huiyu(Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences, Beijing 100085,China) 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1996年第4期491-498,共8页
A systematic analytical method for the species of trace sulfur in water has been developed by using electrochemically coulometric titration in combination with several separation and concentration techniques.Based on ... A systematic analytical method for the species of trace sulfur in water has been developed by using electrochemically coulometric titration in combination with several separation and concentration techniques.Based on the reaction of iodine with sodium azide,the studies were carried out on the catalytically coulometric determination of ppb levels of ionic or molecular sulfides,thiosulfates and hydrogen sulfide in wateri constant current coulometric determination of sulfites;and indirect coulometric determination of sulfate salts and esters.Coupled with the determination of the content of total sulfur,the scope of distribution of the species of inorganic sulfur(including trace sulfur compounds in labile state)and organic sulfur in water was given.The method thus developed was found to be featured by being easy and reliable to operate with a higher sensitivity and reproducibility and to be applicable to the analysis of sulfur species in water. 展开更多
关键词 SULFUR analysis of species electrochemical technique catalytically coulometric titration indirect coulometric titration.
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Influence of surface modified mixed metal oxide nanoparticles on the electrochemical and mechanical properties of polyurethane matrix
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作者 Joseph Raj Xavier 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2023年第1期1-14,共14页
Newly synthesized functional nanoparticles,3-amino-1,2,4-triazole(ATA)/SiO_(2)—TiO_(2)were introduced to the polyurethane(PU)matrix.Electrochemical techniques were used to investigate the barrier properties of the sy... Newly synthesized functional nanoparticles,3-amino-1,2,4-triazole(ATA)/SiO_(2)—TiO_(2)were introduced to the polyurethane(PU)matrix.Electrochemical techniques were used to investigate the barrier properties of the synthesized PU—ATA/SiO_(2)—TiO_(2)nanocomposite coated steel specimen.In natural seawater,electrochemical impedance spectroscopy experiments indicated outstanding protective behaviour for the PU—ATA/SiO_(2)—TiO_(2)coated steel.The coating resistance(Rcoat)of PU—ATA/SiO_(2)—TiO_(2)was determined to be 2956.90 kΩ·cm^(−2).The Rcoat of the PU—ATA/SiO_(2)—TiO_(2)nanocomposite coating was found to be over 50%higher than the PU coating.The current measured along the scratched surface of the PU—ATA/SiO_(2)—TiO_(2)coating was found to be very low(1.65 nA).The enhanced ATA/SiO_(2)—TiO_(2)nanoparticles inhibited the entry of electrolytes into the coating interface,as revealed by scanning electron microscopy/energy dispersive X-ray spectroscopy and X-ray diffraction analysis of the degradation products.Water contact angle testing validated the hydrophobic nature of the PU—ATA/SiO_(2)—TiO_(2)coating(θ=115.4°).When the concentration of ATA/SiO_(2)—TiO_(2)nanoparticles was 2 wt%,dynamic mechanical analysis revealed better mechanical properties.Therefore,the newly synthesised PU—ATA/SiO_(2)—TiO_(2)nanocomposite provided excellent barrier and mechanical properties due to the addition of ATA/SiO_(2)—TiO_(2)nanoparticles to the polyurethane,which inhibited material degradation and aided in the prolongation of the coated steel’s life. 展开更多
关键词 SiO_(2)/TiO_(2)nanoparticle nanocomposite coatings dynamic mechanical analysis electrochemical techniques corrosion colloids and interfaces
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A Study of Eruca vesicaria, Bromelia hemisphaerica and Erythrina americana as Green Corrosion Inhibitors for Carbon Steel in Sulfuric Acid
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作者 M. J. Garcia-Ramirez G. F. Dominguez Patiño +2 位作者 J. G. Gonzalez-Rodriguez M. L. Dominguez-Patiño J. A. Dominguez-Patiño 《Advances in Materials Physics and Chemistry》 2016年第2期9-20,共12页
A study of Eruca vesicaria, Bromelia hemisphaerica and Erythrina americana as eco-friendly corrosion inhibitors for 1018 carbon steel in 0.5 M H<sub>2</sub>SO<sub>4</sub> has been carried out b... A study of Eruca vesicaria, Bromelia hemisphaerica and Erythrina americana as eco-friendly corrosion inhibitors for 1018 carbon steel in 0.5 M H<sub>2</sub>SO<sub>4</sub> has been carried out by using weight loss tests, potentiodynamic polarization curves and electrochemical impedance spectroscopy measuremnts. Results have shown that the three extracts performed as good corrosion inhibitors, but the Eruca vesicaria exhibited the best performance followed by Erythrina americana. The three inhibitors formed a protective, passive film which protected the steel from corrosion. This was because they contain antioxidants present in their molecular structure with heteroatoms such as N, C and O like phenols, amino acids, etc., which react with metal and environment to form the protective film. 展开更多
关键词 Acid Corrosion Green Inhibitors electrochemical techniques
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Corrosion Inhibition of Carbon Steel in Acidic Mediaby Using Actinidia deliciosa(Kiwifruit)Extract
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作者 M.I.Arias-Montoya G.F.Dominguez-Patino +2 位作者 J.G.Gonzalez-Rodriguez J.A.Dominguez-Patino M.L.Dominguez-Patino 《Advances in Materials Physics and Chemistry》 2015年第11期447-457,共11页
The corrosion inhibition of 1018 carbon steel in 0.5 M H2SO4 by using Actinidia deliciosa (Kiwifruit) peel extract has been investigated by using potentiodynamic polarization curves and electro-chemical impedance spec... The corrosion inhibition of 1018 carbon steel in 0.5 M H2SO4 by using Actinidia deliciosa (Kiwifruit) peel extract has been investigated by using potentiodynamic polarization curves and electro-chemical impedance spectroscopy. Two kinds of extracts are investigated, one from the tender, and another one from ripe Actinidia deliciosa. Concentrations include 0, 25, 50, 75, and 100 ppm at room temperature. Results indicate that both kind of extracts acted as good corrosion inhibitors, is more efficient in the ripe extract. Corrosion inhibition efficiency increases with increasing its concentration for ripe extract, whereas for the tender Actinidia deliciosa, the higest inhibitor efficiency is obtained by adding 25 ppm and decresaing with a further increase in its concentration. Both extracts improve the passive film properties by decreasing the passive current density values. It is found that the corrosion inhibition is due to the presence of heteroatoms present in Actinidia deliciosa, mainly quercitine, which is physically adsorbed in the steel following a Frumkin type of adsorption isotherm which forms a protective film. 展开更多
关键词 Green Inhibitor Acidic Corrosion electrochemical techniques
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MICROSCOPIC CORROSION STUDIES OF DUPLEX STAINLESS STEELS 被引量:1
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作者 C.Leygraf J.Pan M.Femenia 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2004年第5期625-631,共7页
Electrochemical scanning tunneling microscopy and scanning electrochemical microscopy have been used for in situ monitoring of localized corrosion processes of different Duplex stainless steels (DSS) in acidic chlorid... Electrochemical scanning tunneling microscopy and scanning electrochemical microscopy have been used for in situ monitoring of localized corrosion processes of different Duplex stainless steels (DSS) in acidic chloride solutions. The techniques allow imaging of local dissolution events with micrometer resolution, as opposed to conventional electrochemical techniques, which only give an overall view of the corrosion behavior. In addition, combined scanning Kelvin probe force microscopy and magnetic force microscopy were used for mapping the Volta potential variation over the surface of DSSs. A significant difference in Volta potential between the austenite and ferrite phases suggests galvanic interaction between the phases. A compositional gradient appears within 2 micrometers across the phase boundary, as seen with scanning Auger microscopy (SAM). In all, the studies suggest that higher alloyed DSS exhibit a more homogeneous dissolution behavior than lower alloyed DSS, due to higher and more similar corrosion resistance of the two phases, and enhanced resistance of the ferrite/austenite phase boundary regions. 展开更多
关键词 duplex stainless steel corrosion mechanism local electrochemical technique surface analysis micrometer resolution
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Interaction of Hydrogen and Retained Austenite in Bainite/Martensite Dual-Phase High Strength Steel
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作者 GUJia-lin CHANGKai-di +2 位作者 FANGHong-sheng YANGZhi-gang BAIBing-zhe 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2004年第1期42-46,共5页
The hydrogen trapping phenomena in two bainite/martensite dual-phase high strength steels(U20Si and U20DSi)were investigated by electrochemical permeation technique.The hydrogen diffusivity was calculated from data of... The hydrogen trapping phenomena in two bainite/martensite dual-phase high strength steels(U20Si and U20DSi)were investigated by electrochemical permeation technique.The hydrogen diffusivity was calculated from data of permeation delay time,and the diffusion coefficient in U20 Si is far less than that in U20 DSi.Moreover,the hydrogen diffusivity decreases as the volume percent of retained austenite increases.The experiment results show that there are different hydrogen trappings and different volume percents of retained austenite in U20 Si and U20 DSi.The retained austenite is precipitated as films.The trap binding energy for the retained austenite and hydrogen is calculated to be 40.4kJ·mol-1. 展开更多
关键词 BAINITE martensite dual-phase high strength steel electrochemical permeation technique diffusion coefficient retained austenite trap binding energy
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Electrochemical behavior and electrowinning of palladium in nitric acid media 被引量:3
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作者 LIU ShengChu WEI YueZhou +1 位作者 LIU RuiQin FANG BaiZeng 《Science China Chemistry》 SCIE EI CAS 2013年第12期1743-1748,共6页
In this study,the electrochemical behavior of Pd(II)in nitric acid media was investigated using various electrochemical techniques.By analyzing the cyclic voltammogram of Pd(II)recorded at Pt electrode,a series of ele... In this study,the electrochemical behavior of Pd(II)in nitric acid media was investigated using various electrochemical techniques.By analyzing the cyclic voltammogram of Pd(II)recorded at Pt electrode,a series of electrochemical reactions associated with palladium were recognized,indicating that Pd(II)undergoes a single step two-electrons irreversible process.Electroreduction reaction of Pd(II)and auto-catalytic reactions of nitrous acid are supposed to play a leading role in low and high concentrations of nitric acid,respectively.Stirring could facilitate the reduction of Pd(II)in relatively low nitric acid concentration(3 mol/L).The value of charge transfer coefficient was determined to be 0.18 for the measurements at 298 K.The diffusion coefficient of Pd(II)increased from 1.89×10 8cm2/s at 288 K to 4.23×10 8cm2/s at 318 K,and the activation energy was calculated to be 21.5 kJ/mol.In electrowinning experiments,SEM images of palladium obtained by electrolysis reveal the dendrite growth in all cases,which is uniform all over the entire surface of Pt electrode.The recovery ratios of Pd at different nitric acid concentrations are high,and the faradic efficiency of electrolysis decreases with increasing the nitric acid concentration.When stirring was introduced during electrolysis,the electrodeposition rate of Pd increased substantially. 展开更多
关键词 PALLADIUM high-level liquid waste electrochemical technique ELECTROWINNING
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