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Carboxylates as green corrosion inhibitors of magnesium alloy for biomedical application
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作者 A.S.Gnedenkov S.L.Sinebryukhov +3 位作者 A.D.Nomerovskii V.S.Marchenko A.Yu.Ustinov S.V.Gnedenkov 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第7期2909-2936,共28页
The efficiency of the green inhibitors(sodium salts of fumarate,glycolate and gluconate)in suppressing corrosion of the structural MA8 magnesium alloy(Mg–Mn–Ce)and the biomedical Mg–0.8Ca alloy was studied using th... The efficiency of the green inhibitors(sodium salts of fumarate,glycolate and gluconate)in suppressing corrosion of the structural MA8 magnesium alloy(Mg–Mn–Ce)and the biomedical Mg–0.8Ca alloy was studied using the hydrogen evolution measurements,mass loss test,EIS,PDP,SVET/SIET.The analysis of the morphology,chemical composition,and growth kinetic of corrosion films formed in 0.9 wt%NaCl solution with and without corrosion inhibitors was carried out.The most compact surface film with the smallest thickness was formed in a saline solution with sodium fumarate.The Mg alloy samples exhibited the highest polarization resistance,the lowest localized electrochemical activity,and the lowest corrosion rate in saline with the addition of sodium fumarate and sodium glycolate.The efficiency of the applied inhibitors was up to 81%.The model of the corrosion mechanism based on the sorption of molecules of organic inhibitors is proposed.The results show the high compatibility of the used inhibitors with the calcium-phosphate PEO-matrix,indicating the possibility of forming a self-healing coating by means of these active substances. 展开更多
关键词 Magnesium and its alloys organic inhibitor Electrochemical behavior PEO-coatin Bioresorbable implant Degradation mechanism
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Synergic Mechanism of an Organic Corrosion Inhibitor for Preventing Carbon Steel Corrosion in Chloride Solution 被引量:4
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作者 刘志勇 YU Lei LI Qingzhong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第2期325-330,共6页
The inhibition effect of dimethylethanolamine(DMEA) and its composite with carboxylic acid was studied with the electrochemical tests. The experimental results indicate that DMEA is not a good inhibitor but the comp... The inhibition effect of dimethylethanolamine(DMEA) and its composite with carboxylic acid was studied with the electrochemical tests. The experimental results indicate that DMEA is not a good inhibitor but the composite of DMEA with caprylic acid exhibits excellent inhibiting efficiency. The synergic mechanism of the organic corrosion inhibitors(OCIs) was studied with quantum chemical calculations. It is found that the DMEA forms a quaternary ammonium salt with the proton in carboxylic acid, and a cyclic complex formed between the salt and Fe may be responsible for the enhancement of inhibiting efficiency. The possible hydrogen bond formed between DMEA and carboxylic acid is not enough for the inhibiting effect. This work is helpful to proposing theoretical interpretation as well as developing a functional organic inhibitor to improve the durability of reinforced concrete contaminated with chloride. 展开更多
关键词 carbon steel organic corrosion inhibitor polarization inhibition chloride solution
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Experimental and modeling study of kinetics for methane hydrate formation in a crude oil-in-water emulsion 被引量:2
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作者 Shranish Kar Himangshu Kakati +1 位作者 Ajay Mandal Sukumar Laik 《Petroleum Science》 SCIE CAS CSCD 2016年第3期489-495,共7页
A low-viscosity emulsion of crude oil in water can be believed to be the bulk of a flow regime in a pipeline.To differentiate which crude oil would and which would not counter the blockage of flow due to gas hydrate f... A low-viscosity emulsion of crude oil in water can be believed to be the bulk of a flow regime in a pipeline.To differentiate which crude oil would and which would not counter the blockage of flow due to gas hydrate formation in flow channels,varying amount of crude oil in water emulsion without any other extraneous additives has undergone methane gas hydrate formation in an autoclave cell.Crude oil was able to thermodynamically inhibit the gas hydrate formation as observed from its hydrate stability zone.The normalized rate of hydrate formation in the emulsion has been calculated from an illustrative chemical affinity model,which showed a decrease in the methane consumption(decreased normalized rate constant) with an increase in the oil content in the emulsion.Fourier transform infrared spectroscopy(FTIR) of the emulsion and characteristic properties of the crude oil have been used to find the chemical component that could be pivotal in selfinhibitory characteristic of the crude oil collected from Ankleshwar,India,against a situation of clogged flow due to formation of gas hydrate and establish flow assurance. 展开更多
关键词 Methane gas hydrates organic inhibitors Chemical affinity model Normalized rate constant Asphaltenes
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Study of an Ionic Fluid on the Electrochemical Test of A36 Carbon Steel Ingot
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作者 Socorro Valdez Rodriguez Martin Ignacio Pech-Canul +4 位作者 Hugo Rojas Oscar Sotelo Francisco Javier Rodríguez Araceli Espinoza-Vazquez Ociel Rodríguez 《Journal of Materials Science and Chemical Engineering》 2022年第2期29-43,共15页
An ionic fluid based on aromatic heterocyclic family constituted by 1,3-diazole groups was investigated. The purpose is to describe their electrochemical characteristics in order to identify the strategy to avoid the ... An ionic fluid based on aromatic heterocyclic family constituted by 1,3-diazole groups was investigated. The purpose is to describe their electrochemical characteristics in order to identify the strategy to avoid the A36 carbon steel surface degradation by using electrochemical measurements. We found that the linear polarization resistance reveals an increasing value when the organic unsaturated cyclic ionic fluid was added to the corrosive electrolyte. The polarization curves and Tafel Extrapolation obtained to know the slopes tafel and the inhibitor efficiency from current density (i<sub>corr</sub>) shows a high efficiency inhibition value. 展开更多
关键词 A36-Steel Ionic Fluid Electrochemical Degradation Tafel Extrapolation Linear Polarization Resistance Diazole Group organic inhibitor
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Effects of Organic Corrosion Inhibitor and Chloride Ion Concentration on Steel Depassivation and Repassivation in Solution
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作者 WANG Zixiao YU Lei +1 位作者 LIU Zhiyong SONG Ning 《Journal of the Chinese Ceramic Society》 2015年第3期163-170,共8页
Effect of an organic corrosion inhibitor(OCI) named PCI-2014 added in chloride solution on the critical chloride concentration of mild steel depassivation and the critical OCI concentrations for repairing the steel in... Effect of an organic corrosion inhibitor(OCI) named PCI-2014 added in chloride solution on the critical chloride concentration of mild steel depassivation and the critical OCI concentrations for repairing the steel in different chloride solution were investigated.The results show that the critical chloride concentration increases exponentially with raises of PCI-2014 concentration in the solution.Within a certain chloride ion concentration range,the critical PCI-2014 concentration for repairing the corroded steel is also increases exponentially with enhancement of chloride content in the solution.Atomic force microscopy images display the molecular particles of inhibitor are adsorbed on the steel surface and formed a protective layer.Analysis of X-ray photoelectron spectroscopy shows the chloride ions at the surface of steel are displaced by atoms or molecules of the inhibitor in chloride condition. 展开更多
关键词 organic corrosion inhibitor critical chloride concentration critical OCI concentration repair of corroded steel bar
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Green corrosion inhibitors intercalated Mg:Al layered double hydroxide coatings to protect Mg alloy 被引量:1
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作者 Muhammad Junaid Anjum Jing-Mao Zhao +3 位作者 Vahdat Zahedi Asl Muhammad Uzair Malik Ghulam Yasin Waheed Qamar Khan 《Rare Metals》 SCIE EI CAS CSCD 2021年第8期2254-2265,共12页
Mg alloy was protected with Mg:Al layered double hydroxide(LDH)coating intercalated with three green corrosion inhibitors(sodium benzoate,3-aminopropyltriethoxysilane and 8-hydroxyquinoline).The in-situ hydrothermal a... Mg alloy was protected with Mg:Al layered double hydroxide(LDH)coating intercalated with three green corrosion inhibitors(sodium benzoate,3-aminopropyltriethoxysilane and 8-hydroxyquinoline).The in-situ hydrothermal approach was adopted to intercalate corrosion inhibitors into Mg:Al LDH coating.The intercalated Mg:Al LDH coating was successfully acquired,and the crystalline structure of Mg:Al LDH coating was verified with X-ray diffraction(XRD).The organic functional groups of corrosion inhibitors were identified with the help of Fourier transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS).The compact and uniform morphology was confirmed by scanning electron microscopy(SEM).The electrochemical measurement revealed better corrosion resistance of corrosion inhibitorintercalated Mg:Al LDH coatings as compared to that of pristine Mg alloy.The corrosion protection mechanism of corrosion inhibitors was described and unearthed the corrosion inhibitor with the best performance. 展开更多
关键词 MAGNESIUM Layered double hydroxide coating organic inhibitors INTERCALATION Corrosion resistance
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