草酸预处理AM50镁合金表面快速原位制备 蒸汽Mg−Al LDH涂层的耐蚀性  

Corrosion resistance of rapidly formed in-situ steam Mg−Al LDH coating on AM50 Mg alloy pretreated with oxalic acid

作　　者：潘仕琪 王金梦 张芬[1] 解浩峰 崔蓝月[1] MBOBBY KANNAN 邹玉红[4] 曾荣昌[1,5] Shi-qi PAN;Jin-meng WANG;Fen ZHANG;Hao-feng XIE;Lan-yue CUI;MBOBBY KANNAN;Yu-hong ZOU;Rong-chang ZENG(Corrosion Laboratory for Light Metals,College of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China;State Key Laboratory of Nonferrous Metals and Processes,GRINM Group Co.,Ltd.,Beijing 100088,China;School of Engineering,University of Newcastle,Callaghan,New South Wales,2308,Australia;College of Chemical and Environmental Engineering,Shandong University of Science and Technology,Qingdao 266590,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450002,China)

机构地区：[1]山东科技大学材料科学与工程学院轻金属腐蚀实验室,青岛266590 [2]有研工程技术研究院有限公司有色金属材料制备加工国家重点实验室,北京100088 [3]School of Engineering,University of Newcastle,Callaghan,New South Wales,2308,Australia [4]山东科技大学化学与环境工程学院,青岛266590 [5]郑州大学材料科学与工程学院,郑州450002

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第6期1843-1863,共21页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.51601108,52071191);the Natural Science Foundation of Shandong Province,China (No.ZR2020ME011).

摘　　要：通过暴露合金表面的金属间化合物(β-Mg17Al12和AlMn),研究草酸(OA)酸洗对AM50镁合金表面原位蒸汽Mg−Al层状双氢氧化物(LDH)涂层成膜机制和耐蚀性的影响。结果表明,OA预处理使镁合金表面金属间化合物比例显著增加,Mg−Al LDH在Al−Mn相周围成核并生长。当酸洗时间为45 s时,所得LDH涂层的厚度最大、耐蚀性最佳,与基体相比,其腐蚀电流密度降低3个数量级。最后,提出了AM50镁合金表面Mg−Al LDH涂层的成膜机制。The effect of oxalic acid(OA)etching on the formation mechanism and corrosion performance of in-situ steam Mg−Al layered double hydroxide(LDH)coatings on AM50 Mg alloy was investigated by exposing the intermetallic compounds(β-Mg17Al12 and AlMn)on the surface of the alloy.The results demonstrated that the presence of OA led to an increased fraction of intermetallic compounds on the Mg substrate.Mg−Al LDH nucleated and grew around the Al−Mn phase.The best corrosion resistance of LDH coating was obtained with the maximum thickness at a pickling time of 45 s,and the corrosion current density was reduced by three orders of magnitude compared to the substrate.Finally,the formation mechanism of Mg−Al LDH coating on AM50 Mg alloy was proposed.

关 键 词：镁合金 草酸 金属间化合物 蒸汽涂层 层状双氢氧化物 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]