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Corrosion resistance of Mg-Al-LDH steam coating on AZ80 Mg alloy:Effects of citric acid pretreatment and intermetallic compounds

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Journal of Magnesium and Alloys 2023年第8期11卷 2967-2979页

作者： Jin-Meng Wang Xiang Sun Liang Song M.Bobby Kannan Fen Zhang Lan-Yue Cui Yu-Hong Zou Shuo-Qi Li Rong-Chang Zeng Corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China School of Engineering University of NewcastleCallaghanNew South Wales 2308Australia College of Science and Engineering James Cook UniversityTownsvilleQueensland 4811Australia College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

In this study,the effects of intermetallic compounds(Mg_(17)Al_(12)and Al_(8)Mn_(5))on the Mg-Al layered double hydroxide(LDH)formation mechanism and corrosion behavior of an in-situ LDH/Mg(OH)_(2)steam coatings on AZ80 Mg alloy were *** acid(CA)was used to activate the alloy surface during the pretreatment *** alloy was first pretreated with CA and then subjected to a hydrothermal process using ultrapure water to produce Mg-Al-LDH/Mg(OH)_(2)steam *** effect of different time of acid pretreatment on the activation of the intermetallic compounds was *** microstructure and elemental composition of the obtained coatings were analyzed using FE-SEM,EDS,XRD and *** corrosion resistance of the coated samples was evaluated using different techniques,i.e.,potentiodynamic polarization(PDP),electrochemical impedance spectrum(EIS)and hydrogen evolution *** results indicated that the CA pretreatment significantly influenced the activity of the alloy surface by exposing the intermetallic *** surface area fraction of Mg_(17)Al_(12)and Al_(8)Mn_(5)phases on the surface of the alloy was significantly higher after the CA pretreatment,and thus promoted the growth of the subsequent Mg-Al-LDH *** CA pretreatment for 30 s resulted in a denser and thicker LDH *** in the CA pretreatment time significantly led to the improvement in corrosion resistance of the coated AZ80 *** corrosion current density of the coated alloy was lower by three orders of magnitude as compared to the uncoated alloy.

关键词： Magnesium alloy Citric acid pretreatment steam coating Layered double hydroxide Intermetallic compounds Corrosion resistance

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Influence of intermetallic Al-Mn particles on in-situ steam Mg-Al-LDH coating on AZ31 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2022年第12期32卷 3926-3949页

作者： Feng LI Xiang SUN Liang SONG M.Bobby KANNAN Fen ZHANG Lan-yue CUI Yu-hong ZOU Shuo-qi LI Cheng-bao LIU Rong-chang ZENG Corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China School of Engineering University of NewcastleCallaghanNew South Wales 2308Australia College of Science and Engineering James Cook UniversityTownsvilleQueensland 4811Australia College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

The influence of intermetallic Al-Mn particles on the corrosion behavior of in-situ formed Mg-Al layered double hydroxide(Mg-Al-CO32--LDH)steam coating on AZ31 Mg alloy was *** alloy was pretreated with H3PO4,HCl,HNO3or citric acid(CA),followed by hydrothermal treatment,for the fabrication of Mg-Al-LDH *** microstructure,composition and corrosion resistance of the coated samples were *** results showed that the surface area fraction of Al-Mn phase exposed on the surface of the alloy was significantly increased after CA pretreatment,which promotes the growth of the Mg-Al-LDH steam ***,the LDH-coated alloy pretreated with CA possessed the most compact surface and the maximum coating thickness among all the *** corrosion current density of the coated alloy was decreased by three orders of magnitude as compared to that of the bare alloy.

关键词： magnesium alloy acid pretreatment layered double hydroxide intermetallic particles steam coating corrosion resistance

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维普期刊数据库

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Advances in Mg-Al-layered double hydroxide steam coatings on Mg alloys:A review

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Journal of Magnesium and Alloys 2023年第5期11卷 1505-1518页

作者： Shi-Qi Pan Fen Zhang Cuie Wen Rong-Chang Zeng Corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China School of Engineering RMIT UniversityMelbourneVictoria3001Australia School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450002China

Layered double hydroxide(LDH)coatings on magnesium(Mg)alloys shine brightly in the field of corrosion protection because of their special ion-exchange ***-of-the-art steam coating as a type of LDH film preparation technique has emerged in recent years because only pure water is required as the steam source and its environmentally friendly LDH coating fits the current need for green ***,this coating can effectively inhibit the corrosion of the Mg alloy substrate due to the chemical bonding between the coating and the Mg alloy *** review systematically explains cutting-edge advancements in the growth mechanism and corrosion behavior of LDH steam coatings,and analyzes the advantages and limitations of the steam-coating *** influencing factors including pressure,CO_(2)/CO_(3)^(2-),aluminum content of the substrate alloy,solution type,and acid-pickling pretreatment,as well as the post-treatment of steam-coating defects,are comprehensively elucidated,providing new insights into the development of the in situ steam-coating ***,existing issues and future prospects are discussed to further accelerate the widespread application of Mg alloys.

关键词： Corrosion Layered double hydroxide(LDH) Mg alloy steam coating Surface modification

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