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Double open mouse-like terpyridine parts based amphiphilic ionic molecules displaying strengthened chemical adsorption for anticorrosion of copper in sulfuric acid solution
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作者 Yueting Shi Junhai Zhao +3 位作者 Lingli Chen Hongru Li Shengtao Zhang Fang Gao 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第5期233-246,共14页
In this study,the benign target double terpyridine parts based amphiphilic ionic molecules(AIMs 1,2)and the reference single terpyridine segment included AIMs(AIMs 3,4)were synthesized through a multi-step method,and ... In this study,the benign target double terpyridine parts based amphiphilic ionic molecules(AIMs 1,2)and the reference single terpyridine segment included AIMs(AIMs 3,4)were synthesized through a multi-step method,and the molecular structures were fully characterized.The excellent anticorrosion of the target AIMs for copper surface in H_(2)SO_(4) solution was demonstrated by the electrochemistry analysis,which was more superior over those of the reference AIMs.The standard adsorption free energy changes of the target AIMs calculated by the adsorption isotherms were lower than -40 kJ·mol^(-1),suggesting an intensified chemical adsorption on metal surface.The molecular modeling and molecular dynamic computation of the studied AIMs were performed,demonstrating that the target AIMs exhibited lower highest occupied molecular orbital-lowest unoccupied molecular orbital energy gaps and greater adsorption energies than the reference ones.The chemical adsorption of the AIMs on metal surface was revealed by various spectroscopic methods including scanning electron microscopy,atomic force microscopy,Fourier transform infrared spectroscopy,attenuated total reflection infrared spectroscopy,Raman and X-ray diffraction. 展开更多
关键词 Amphiphilic ionic molecule Adsorption corrosion Electrochemistry COPPER H_(2)SO_(4)solution
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Effect of Corrosive Solutions on C-S-H Microstructure in Portland Cement Paste with Fly Ash 被引量:3
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作者 丁庆军 WANG Huan +1 位作者 HU Chenguang 张高展 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第5期1002-1007,共6页
By means of ^(29)Si and ^(27)Al magic angle spinning nuclear magnetic resonance(MAS NMR) combined with deconvolution technique, X-ray diffraction(XRD), scanning electron microscopy(SEM) as well as energy dis... By means of ^(29)Si and ^(27)Al magic angle spinning nuclear magnetic resonance(MAS NMR) combined with deconvolution technique, X-ray diffraction(XRD), scanning electron microscopy(SEM) as well as energy dispersive X-ray system(EDX), the effect of 5 wt% corrosive solutions( viz. 5 wt% Na_2SO_4, MgSO_4, Na_2SO_^(4+)Na Cl and Na_2SO_^(4+)Na Cl+Na_2CO_3) on C-S-H microstructure in portland cement containing 30 wt% fly ash was investigated.The results show that, in MgSO_4 solution, Mg2+ promotes the decalcification of C-S-H by SO_4^(2-),increasing silicate tetrahedra polymerization and mean chain length(MCL) of C-S-H. However, the substituting degree of Al^(3+) for Si^(4+)(Al[4]/Si) in the paste does not change evidently. Effect of Na_2SO_4 solution on C-S-H is not significantly influenced by Na Cl solution, while the MCL and Al[4]/Si of C-S-H in fly ashcement paste slightly change. However, the decalcification of C-S-H by SO_4^(2-) and CO_3^(2-) attack, as well as the activation of fly ash by SO_4^(2-) attack will increase the MCL and Al[4]/Si, which are both higher than that under Na_2SO_4 corrosion, MgSO_4 or Na_2SO_4 +Na Cl coordination corrosion. 展开更多
关键词 corrosive solutions cement fly ash C-S-H microstructure /Si
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Corrosion behavior of tinplate in NaCl solution 被引量:10
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作者 夏大海 宋诗哲 +3 位作者 王吉会 毕慧超 蒋雨轩 韩哲文 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第3期717-724,共8页
The corrosion process of tinplate in 0.5 mol/L NaCl solution was investigated using the electrochemical impedance spectroscopy(EIS),and the morphology and structure of the corrosion products were characterized by sc... The corrosion process of tinplate in 0.5 mol/L NaCl solution was investigated using the electrochemical impedance spectroscopy(EIS),and the morphology and structure of the corrosion products were characterized by scanning electron microscope(SEM),scanning probe microscopy(SPM),X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS).The results showed that the resistance of tin coating,Rc,was essentially constant but the charge transfer resistance,Rct,decreased by 2 orders of magnitude,which indicated that the tin coating was not seriously corroded while the carbon steel substrate was corroded continuously.The corrosion of tinplate in 0.5 mol/L NaCl solution was mainly the dissolution of carbon steel substrate because of the defects in the tin layer and the corrosion product was mainly γ-FeOOH. 展开更多
关键词 TINPLATE corrosion behavior electrochemical impedance spectroscopy NaCl solution
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Corrosion and leaching behaviors of Sn-based alloy in simulated soil solutions 被引量:2
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作者 劳晓东 程从前 +4 位作者 闵小华 赵杰 周大雨 王丽华 李晓刚 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第2期581-588,共8页
The corrosion and leaching behaviors of Sn-0.75Cu solders and joints in NaCl-Na2SO4 and NaCl-Na2SO4-Na2CO3 simulated soil solutions were investigated compared with those in NaCl solution, aiming to assess the potentia... The corrosion and leaching behaviors of Sn-0.75Cu solders and joints in NaCl-Na2SO4 and NaCl-Na2SO4-Na2CO3 simulated soil solutions were investigated compared with those in NaCl solution, aiming to assess the potential risk from the electronic-waste disposed in soil. The leaching kinetics of Sn reveals that the leaching amount of Sn increases with increasing the time. The amount of Sn leached from the joint is the largest in NaCl solution.SO4^2- and CO3^2- inhibit the leaching of Sn from the joints, but accelerate that from the solders. Meanwhile, the corrosion layer of the joint in NaCl solution is more porous, and those immersed in NaCl-Na2SO4 and NaCl-Na2SO4-Na2CO3 solutions are compact. The XRD results indicate that the main corrosion products on the solders and joints surfaces are comprised of tin oxide, tin chloride and tin chloride hydroxide. The potentiodynamic polarization measurements for the solders were discussed in the simulated soil solutions. 展开更多
关键词 Sn-0.75Cu alloy corrosION LEACHING simulated soil solutions
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Corrosion behavior of Hastelloy C22 coating produced by laser cladding in static and cavitation acid solution 被引量:2
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作者 王勤英 白树林 刘宗德 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第5期1610-1618,共9页
The Hastelloy C22 coatings on Q235 steel substrate were produced by high power diode laser cladding technique. Their corrosion behaviors in static and cavitation hydrochloric, sulfuric and nitric acid solutions were i... The Hastelloy C22 coatings on Q235 steel substrate were produced by high power diode laser cladding technique. Their corrosion behaviors in static and cavitation hydrochloric, sulfuric and nitric acid solutions were investigated. The electrochemical results show that corrosion resistance of coatings in static acid solutions is higher than that in cavitation ones. In each case, coating corrosion resistance in descending order is in nitric, sulfuric and hydrochloric acid solutions. Obvious erosion-corrosion morphology and serious intercrystalline corrosion of coating are noticed in cavitation hydrochloric acid solution. This is mainly ascribed to the aggressive ions in hydrochloric acid solution and mechanical effect from cavitation bubbles collapse. While coating after corrosion test in cavitation nitric acid solution shows nearly unchanged surface morphology. The results indicate that the associated action of cavitation and property of acid solution determines the corrosion development of coating. Hastelloy C22 coating exhibits better corrosion resistance in oxidizing acid solution for the stable formation of dense oxide film on the surface. 展开更多
关键词 Hastelloy C22 coating laser cladding acid solution cavitation corrosion electrochemical impedance spectroscopy
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Corrosion behavior of brass coinage in synthetic sweat solution
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作者 梁成浩 王树森 +1 位作者 黄乃宝 王鹏 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第2期654-660,共7页
Corrosion behavior of brass coinage was investigated in synthetic sweat solution by electrochemical measurement and surface analysis methods including scanning electron microscope (SEM) and energy dispersive X-ray s... Corrosion behavior of brass coinage was investigated in synthetic sweat solution by electrochemical measurement and surface analysis methods including scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDX). It is indicated that chloride ions in sweat solution accelerate the anodic active dissolution of brass, which is the main reason of pitting corrosion and dezincification corrosion. Meanwhile, lactic acid and ammonia water also promote the anode reaction. The corrosion products on the surface are mainly composed of basic copper chloride, cuprous oxide, the complex consisting of urea in association with copper, and few lactate ion. The kinetics of pitting corrosion development obeys the following equation of J0=0.3735(t+185.93)^-1/2, and the process is controlled by dissolution of salt deposited on pit surface. 展开更多
关键词 brass coinage DEZINCIFICATION pitting corrosion synthetic sweat solution
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Corrosion properties of stainless steel 316L/Ni-Cu-P coatings in warm acidic solution
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作者 方信贤 周衡志 薛亚军 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第8期2594-2600,共7页
In order to improve corrosion resistance of stainless steel 316L in warm acidic solution, Ni?Cu?P coatings with high copper and phosphorus contents were deposited onto stainless steel 316L substrates via electroless... In order to improve corrosion resistance of stainless steel 316L in warm acidic solution, Ni?Cu?P coatings with high copper and phosphorus contents were deposited onto stainless steel 316L substrates via electroless plating. The structure of the film and its resistance to corrosion in a warm acidic environment were investigated using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction spectrometry (XRD), polarization curves, electrochemical impedance spectroscopy (EIS), and dipping corrosion tests, respectively. The results demonstrate that Ni?Cu?P coatings consist of two types of nodules, which are 19.98% Cu and 39.17% Cu (mass fraction) respectively. The corrosion resistance of the 316L substrate when subjected to a warm acidic solution is significantly improved by the addition of the new type of the Ni?Cu?P coating. The as-plated coatings demonstrate better corrosion resistance than annealed coatings. As-plated coatings and those annealed at 673 K are found to corrode selectively, while pitting is observed to be the main corrosion mechanism of coatings annealed at 773 and 873 K. 展开更多
关键词 Ni-Cu-P coating stainless steel 316L corrosion resistance corrosion mechanism warm acidic solution
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正交试验法研究模拟土壤溶液中SO_(4)^(2-)、Cl^(-)和CO_(3)^(2-)对低碳钢腐蚀的影响
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作者 李莎莎 曹雪雅 +2 位作者 赵华宇 卢彩彬 芦玉峰 《涂层与防护》 2024年第3期46-50,共5页
为了研究中性土壤中SO_(4)^(2-)、Cl^(-)和CO_(3)^(2-)3种离子对低碳钢腐蚀的影响,以中性土壤中3种阴离子的含量为基础,将3种离子作为实验因素,3种离子浓度作为水平,设计了正交试验。采用全浸实验,1 a后通过观测低碳钢的表面腐蚀形貌、... 为了研究中性土壤中SO_(4)^(2-)、Cl^(-)和CO_(3)^(2-)3种离子对低碳钢腐蚀的影响,以中性土壤中3种阴离子的含量为基础,将3种离子作为实验因素,3种离子浓度作为水平,设计了正交试验。采用全浸实验,1 a后通过观测低碳钢的表面腐蚀形貌、分析腐蚀产物成分,并对腐蚀速率和点蚀深度进行极差分析。发现模拟土壤溶液中CO_(3)^(2-)含量低时,低碳钢表面的腐蚀产物主要是Fe_(3)O_(4)、α-FeOOH和γ-FeOOH,锈层松散易清除,低碳钢以整体腐蚀为主;CO_(3)^(2-)含量增高,低碳钢表面的腐蚀产物主要是Fe_(3)O_(4)和α-FeOOH,锈层致密不易清除,低碳钢发生点蚀。在中性土壤模拟溶液中3种阴离子对低碳钢腐蚀失重速率的影响排序为:SO_(4)^(2-)>Cl^(-)>CO_(3)^(2-),对低碳钢点蚀深度的影响排序为:CO_(3)^(2-)>SO_(4)^(2-)>Cl^(-)。中性土壤中,SO_(4)^(2-)对低碳钢的整体腐蚀影响最大,CO_(3)^(2-)对点蚀的影响最大。 展开更多
关键词 正交试验法 低碳钢 模拟土壤溶液 阴离子 腐蚀 极差分析
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Electrochemical and analytical characterization of three corrosion inhibitors of steel in simulated concrete pore solutions 被引量:7
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作者 Jin-jie Shi Wei Sun 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第1期38-47,共10页
Corrosion inhibitors for steel, such as sodium phosphate (Na3PO4), sodium nitrite (NaNO2), and benzotriazole (BTA), in simulated concrete pore solutions (saturated Ca(OH)2) were investigated. Corrosion behav... Corrosion inhibitors for steel, such as sodium phosphate (Na3PO4), sodium nitrite (NaNO2), and benzotriazole (BTA), in simulated concrete pore solutions (saturated Ca(OH)2) were investigated. Corrosion behaviors of steel in different solutions were studied by means of corrosion potential (Ecorr), linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). A field emission scanning electron microscope (FESEM) equipped with energy dispersive X-ray analysis (EDXA) was used for observing the microstructures and morphology of corrosion products of steel. The results indicate that, compared with the commonly used nitrite-based inhibitors, Na3PO4 is not a good inhibitor, while BTA may be a potentially effective inhibitor to prevent steel from corrosion in simulated concrete pore solutions. 展开更多
关键词 steel corrosion inhibitors electrochemical analysis CONCRETE solutionS
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Electrochemical Corrosion Behavior of Nd-Fe-B Sintered Magnets in Different Acid Solutions 被引量:8
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作者 郑精武 姜力强 陈巧玲 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第2期218-222,共5页
Electrochemical corrosion behavior of Nd-Fe-B sintered magnets in nitric acid, hydrochloric acid, sulfuric acid, phosphate acid and in oxalic acid was studied. Potentiodynamic polarization curves and immersion time de... Electrochemical corrosion behavior of Nd-Fe-B sintered magnets in nitric acid, hydrochloric acid, sulfuric acid, phosphate acid and in oxalic acid was studied. Potentiodynamic polarization curves and immersion time dependence of corrosion rates of Nd-Fe-B sintered magnets in different acid solutions were tested. Microstructures of corroded Nd-Fe-B sintered magnets were investigated by means of SEM and AFM. The results indicate that in strong acid solutions of similar hydrogen ion concentration, the corrosion current increases in the order of HCl 〉 H3SO4 〉 HNO3 solution and Nd-Fe-B sintered magnets are passivated in phosphate acid and oxalic acid. Within 25 min, the corrosion rates of Nd-Fe-B sintered magnets in H2SO4 and H3PO4 solutions show a declining trend with immersion time, while in HNO3 and HCl solutions the corrosion rates are rising. And in H2C2O4 solution, weight of the magnets increases. The brim of Nd-Fe-B sintered magnets is corroded rather seriously and the size of the magnets changed greatly in nitric acid. The surfaces of the corroded magnets in the above mentioned acid solutions are all coarse. 展开更多
关键词 Nd-Fe-B sintered magnets corrosION acid solution MICROSTRUCTURE rare earths
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Role of Chloride Ion and Dissolved Oxygen in Electrochemical Corrosion of AA5083-H321 Aluminum-Magnesium Alloy in NaCl Solutions under Flow Conditions 被引量:9
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作者 K.Jafarzadeh T.Shahrabi +1 位作者 S.M.M.Hadavi M.G.Hosseini 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2007年第5期623-628,共6页
Flow-induced corrosion consists electrochemical and mechanical components. The present paper has to assessed the role of chloride ion and dissolved oxygen in the electrochemical component of flow induced corrosion for... Flow-induced corrosion consists electrochemical and mechanical components. The present paper has to assessed the role of chloride ion and dissolved oxygen in the electrochemical component of flow induced corrosion for AA5083-H321 aluminum-magnesium alloy which is extensively used in the construction of high-speed boats, submarines, hovercrafts, and desalination systems, in NaCI solutions. Electrochemical tests were carried out at flow velocities of 0, :2, 5, 7 and 10 m/s, in aerated and deaerated NaCI solutions with different sodium chloride concentrations. The results showed that the high rate of oxygen reduction under hydrodynamic conditions causes an increase in the density of pits on the surface. The increase of chloride ions concentration under flow conditions accelerates the rate of anodic reactions, but have no influence on the cathodic reactions. Thus, in the current work, it was found that under flow conditions, due to the elimination of corrosion products inside the pits, corrosion resistance of the alloy is increased. 展开更多
关键词 corrosION FLOW NaCl solution AA5083-H321 aluminum-magnesium alloy Chloride ion OXYGEN
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Corrosion of Artificial Aged Magnesium Alloy AZ80 in 3.5 wt pct NaCl Solutions 被引量:7
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作者 Rongchang ZENG Enhou HAN Wei KE 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2007年第3期353-358,共6页
The corrosion morphologies of aged magnesium alloy AZ80 were investigated by immersion corrosion tests, scanning electron microscopy (SEM), electrochemical measurement. The T5 heat treatment was carried out in a vac... The corrosion morphologies of aged magnesium alloy AZ80 were investigated by immersion corrosion tests, scanning electron microscopy (SEM), electrochemical measurement. The T5 heat treatment was carried out in a vacuum furnace, holding for 16 h at 177℃, and then cooling in air. The results showed intergranular corrosion (IGC) occurred as an aged AZ80 sample was immersed in 3.5 wt pct NaCI aqueous solution for 1 h and the narrow path attack progressed predominantly along the bulk β phase in the grain boundaries or took place in the eutectic areas. IGC was attributed to the network distribution of β phase along the grain boundaries, the depleted aluminium in the precipitation areas and the breakdown potential. 展开更多
关键词 Magnesium alloy AZ80 Intergranular corrosion NaCl solution
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Influence of solution treatment on microstructure,mechanical and corrosion properties of Mg-4Zn alloy 被引量:6
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作者 Hongmin Jia Xiaohui Feng Yuansheng Yang 《Journal of Magnesium and Alloys》 SCIE EI CAS 2015年第3期247-252,共6页
The solution treatment parameters,mechanical properties and corrosion behavior of binary Mg-4Zn alloy were investigated.The results showed that after the solution treatment at 335℃ for 16 h,Mg-4Zn alloy had an ultima... The solution treatment parameters,mechanical properties and corrosion behavior of binary Mg-4Zn alloy were investigated.The results showed that after the solution treatment at 335℃ for 16 h,Mg-4Zn alloy had an ultimate tensile strength of 184.13 MPa and elongation of 9.43%.Furthermore,the corrosion resistance was evaluated by electrochemical measurements and immersion tests in 3.5%NaCl solution.The results revealed that the corrosion current density of the solution treatment Mg alloy was 11.2µA/cm^(−2),it was lower than 15.8µA/cm^(−2) for the as-cast Mg alloy under the same conditions,which was greatly associated with the micro-cathode effect of the second phases. 展开更多
关键词 solution treatment Magnesium alloy Mechanical property corrosion behavior
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(Short communication) Degradation of corrosion resistance of Zircaloy-4 in LiOH aqueous solution 被引量:2
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作者 LIUWenqing ZHOUBangxin LIQiang YAOMeiyi 《Rare Metals》 SCIE EI CAS CSCD 2004年第3期286-288,共3页
To investigate the degradation of corrosion resistance of Zircaloy-4 in LiOHaqueous solution, SIMS (secondary ion mass spectrometry) analysis was performed to examine theprofiles of Li^+, K^+, and OH^- in oxide layers... To investigate the degradation of corrosion resistance of Zircaloy-4 in LiOHaqueous solution, SIMS (secondary ion mass spectrometry) analysis was performed to examine theprofiles of Li^+, K^+, and OH^- in oxide layers formed in the same concentration (0.1 mol/L) LiOHand KOH solutions. Even though the oxide layers have an equal thickness, the pene-tration depth ofK^+ is shallower than that of Li^+, and the penetration depth of OH^- corroded in KOH solution isalso shal-ower than that corroded in LiOH solution. It shows that the diffusion of OH^- into oxidelayer is accompanied by the corresponding cation. The difference of degradation effect of LiOH andKOH solutions on the corrosion resistance of Zircaloy-4 was discussed. 展开更多
关键词 ZIRCALOY-4 corrosion resistance SIMS LiOH aqueous solution
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Evaluation of electrochemical impedance and biocorrosion characteristics of as-cast and T4 heat treated AZ91 Mg-alloys in Ringer’s solution 被引量:5
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作者 Nagaraj M.Chelliah Pambannan Padaikathan Ram Kumar 《Journal of Magnesium and Alloys》 SCIE EI CAS 2019年第1期134-143,共10页
The present study aims at understanding the electrochemical impedance and biocorrosion characteristics of AZ91 Mg-alloy in Ringer’s solution.As-cast AZ91 Mg-alloy was subjected to T4 heat treatment in a way to homoge... The present study aims at understanding the electrochemical impedance and biocorrosion characteristics of AZ91 Mg-alloy in Ringer’s solution.As-cast AZ91 Mg-alloy was subjected to T4 heat treatment in a way to homogenize its microstructure by dissolving most of theβ-Mg 17 Al 12 phase at the vicinity of grain boundaries.The electrochemical impedance and biocorrosion performances of these two different microstructures(as-cast and T4 heat treated AZ91 Mg-alloys)in Ringer solution were evaluated by electrochemical impendence spectroscopy,potentiodynamic polarization and weight loss method.EIS spectra showed that both microstructures exhibit similar dynamic response as a function of the immersion time;however,the value of impedance and maximum phase angle are about 50%higher in as-cast AZ91 Mg-alloy as compared to that of homogenized AZ91 Mg-alloy.Weight loss measurement indicated that corrosion resistance of as-cast AZ91 was significantly better than that of homogenized AZ91.Microstructural and XRD analysis revealed that as-cast AZ91 contains a passive film of MgCO_(3)and CaCO_(3)precipitates with near spherical morphologies,whereas homogenized AZ91 comprised mainly unstable Mg(OH)_(2)film featured by irregular plate-like morphologies. 展开更多
关键词 Mg-alloys Ringers solution HOMOGENIZATION corrosion Electrochemical impedance Spectroscopy(EIS) Weight loss
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Different role of second phase in the micro-galvanic corrosion of WE43 Mg alloy in NaCl and Na_(2)SO_(4) solution 被引量:5
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作者 Baojing Feng Guonan Liu +7 位作者 Peixu Yang Sensen Huang Dongqing Qi Peng Chen Chengduo Wang Jiang Du Shaojun Zhang Jinhui Liu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2022年第6期1598-1608,共11页
Effect of the second phase in the micro-galvanic corrosion of a commercial Mg alloy containing rare earth elements, cast WE43 alloy,was investigated in 0.6 M NaCl solution and 0.6 M Na_(2)SO_(4)solution by scanning el... Effect of the second phase in the micro-galvanic corrosion of a commercial Mg alloy containing rare earth elements, cast WE43 alloy,was investigated in 0.6 M NaCl solution and 0.6 M Na_(2)SO_(4)solution by scanning electron microscopy(SEM) observations, scanning Kelvin probe force microscopy(SKPFM) analysis, hydrogen evolution, weight loss measurement, and electrochemical techniques. It is confirmed that the second phase of cast WE43 alloy is more active than Mg matrix and exhibits an anodic role in the micro-galvanic corrosion with α-Mg matrix as cathode and dissolves preferentially in Na_(2)SO_(4)solution, in contrast to the situation in NaCl solution. The corrosion rate of cast WE43 alloy in Na_(2)SO_(4)solution is much higher than that in NaCl solution, which is different from the conventional wisdom and could be attributed to the different role of the second phase in the micro-galvanic corrosion in two solutions. 展开更多
关键词 Mg rare earth alloy Second phase Micro-galvanic corrosion Anode role solution anion
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Pitting Corrosion Behaviour of Monel-400 Alloy in Chloride Solutions 被引量:8
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作者 V.K.Gouda I.Z.Selim A.A.Khedr and A.M.Fathi(Physical Chemistry Dept., National Research Centre, Dokki, Cairo, Egypt) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1999年第3期208-212,共5页
Pitting corrosion behaviour of Monel-400 alloy in 3.5 wt pct NaCl sodium chloride solution has been investigated using the cyclic potentiodynamic anodic polarization technique. The effect of chloride ion concentration... Pitting corrosion behaviour of Monel-400 alloy in 3.5 wt pct NaCl sodium chloride solution has been investigated using the cyclic potentiodynamic anodic polarization technique. The effect of chloride ion concentration, pH values and difFerent temperatures on the pitting parameters were determined. The morphology of the pits produced after anodic polarization treatments was inspected by scanning electron microscope (SEM). The results indicated that, the increase in chloride ion concentration shifts Epit and Eprot of the alloy toward negative values and the pitting potential is much more dependent on pH value in the basic region. The breakdown of passivity with increasing temperature may be due to kinetic changes of passivating films and dissolution rate of the alloy in its passive state 展开更多
关键词 FIGURE Pitting corrosion Behaviour of Monel-400 Alloy in Chloride solutions
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Effects of applied potential on the stress corrosion cracking behavior of 7003 aluminum alloy in acid and alkaline chloride solutions 被引量:6
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作者 Xiao-yan Zhang Ren-guo Song +2 位作者 Bin Sun Hai Lu Chao Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第7期819-826,共8页
Potentiodynamic polarization tests and slow strain rate test(SSRT) in combination with fracture morphology observations were conducted to investigate the stress corrosion cracking(SCC) behavior of 7003 aluminum al... Potentiodynamic polarization tests and slow strain rate test(SSRT) in combination with fracture morphology observations were conducted to investigate the stress corrosion cracking(SCC) behavior of 7003 aluminum alloy(AA7003) in acid and alkaline chloride solutions under various applied potentials(Ea). The results show that AA7003 is to a certain extent susceptible to SCC via anodic dissolution(AD) at open-circuit potential(OCP) and is highly susceptible to hydrogen embrittlement(HE) at high negative Ea in the solutions with p H levels of 4 and 11. The susceptibility increases with negative shift in the potential when Ea is less than-1000 m V vs. SCE. However, the susceptibility distinctly decreases because of the inhibition of AD when Ea is equal to-1000 m V vs. SCE. In addition, the SCC susceptibility of AA7003 in the acid chloride solution is higher than that in the alkaline solution at each potential. Moreover, the effect of hydrogen on SCC increases with increasing hydrogen ion concentration. 展开更多
关键词 aluminum alloys stress corrosion cracking susceptibility hydrogen embrittlement potential acid solutions alkaline solutions
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Corrosion behavior of as-cast Mg–8Li–3Al+xCe alloy in 3.5wt% NaCl solution 被引量:7
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作者 S.Manivannan P.Dinesh +3 位作者 R.Mahemaa Nandhakumaran MariyaPillai S.P.Kumaresh Babu Srinivasan Sundarrajan 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第10期1196-1203,共8页
Mg-8Li-3Al+xCe alloys(x = 0.5wt%, 1.0wt%, and 1.5wt%) were prepared through a casting route in an electric resistance furnace under a controlled atmosphere. The cast alloys were characterized by X-ray diffraction, ... Mg-8Li-3Al+xCe alloys(x = 0.5wt%, 1.0wt%, and 1.5wt%) were prepared through a casting route in an electric resistance furnace under a controlled atmosphere. The cast alloys were characterized by X-ray diffraction, optical microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The corrosion behavior of the as-cast Mg-8Li-3Al+xCe alloys were studied under salt spray tests in 3.5wt% NaC l solution at 35°C, in accordance with standard ASTM B-117, in conjunction with potentiodynamic polarization(PDP) tests. The results show that the addition of Ce to Mg-8Li-3Al(LA83) alloy results in the formation of Al_2Ce intermetallic phase, refines both the α-Mg phase and the Mg_(17)Al_(12) intermetallic phase, and then increases the microhardness of the alloys. The results of PDP and salt spray tests reveal that an increase in Ce content to 1.5wt% decreases the corrosion rate. The best corrosion resistance is observed for the LA83 alloy sample with 1.0wt% Ce. 展开更多
关键词 magnesium lithium alloys cerium sodium chloride solutions corrosion rate polarization
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Corrosion behavior of pure aluminum in FeCl_3 solution 被引量:1
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作者 屈钧娥 郭兴蓬 +1 位作者 王海人 黄金营 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2006年第6期1460-1466,共7页
The corrosion behavior of pure aluminum in FeCl3 solution was investigated mainly by in-situ AFM(Atomic Force Microscopy).The results of combined researches of AFM,SEM(Scanning Electron Microscopy)and EDAX(Energy Disp... The corrosion behavior of pure aluminum in FeCl3 solution was investigated mainly by in-situ AFM(Atomic Force Microscopy).The results of combined researches of AFM,SEM(Scanning Electron Microscopy)and EDAX(Energy Dispersive Analysis of X-ray)show that in addition to uniform attack,pitting corrosion takes place also on pure aluminum surface in FeCl3 solution at open-circuit potential,and impurity elements Fe and Cu are found enriched in corrosion product.In-situ AFM was also used to examine the initiation and development of pitting corrosion of pure aluminum induced by potentiodynamic sweep,and the repassivation of an active pit is observed.AFM tip scratching technique was used to produce a physical defect on metal surface,which is traced by in-situ AFM and it is found that the defect is likely to be preferentially attacked and evolve to pitting corrosion. 展开更多
关键词 PURE aluminum PITTING corrosion FECL3 solution AFM uniform ATTACK
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