摘要
研究金属间合物Al-Mn颗粒对AZ31镁合金原位形成的Mg-Al水滑石(Mg-Al-CO32--LDH)蒸气涂层腐蚀行为的影响。该合金用H3PO4、HCl、HNO3或柠檬酸(CA)进行预处理,然后进行水热处理制备Mg-Al-LDH涂层。研究涂层样品的显微组织、组成和耐腐蚀性。结果表明,经CA预处理后,合金表面暴露的Al-Mn相的表面积分数显著增加,促进Mg-Al-LDH蒸气涂层的生长。此外,经CA预处理后的合金上LDH涂层在所有涂层中表面最致密、涂层厚度最大。与裸合金相比,含有涂层样品的腐蚀电流密度降低3个数量级。
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 investigated.The alloy was pretreated with H3PO4,HCl,HNO3or citric acid(CA),followed by hydrothermal treatment,for the fabrication of Mg-Al-LDH coating.The microstructure,composition and corrosion resistance of the coated samples were investigated.The 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 coating.Further,the LDH-coated alloy pretreated with CA possessed the most compact surface and the maximum coating thickness among all the coatings.The corrosion current density of the coated alloy was decreased by three orders of magnitude as compared to that of the bare alloy.
作者
李峰
孙翔
宋亮
M.Bobby KANNAN
张芬
崔蓝月
邹玉红
李硕琦
刘成宝
曾荣昌
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 Engineering,Shandong University of Science and Technology,Qingdao 266590,China;School of Engineering,University of Newcastle,Callaghan,New South Wales 2308,Australia;College of Science and Engineering,James Cook University,Townsville,Queensland 4811,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)
基金
supported by the National Natural Science Foundation of China(Nos.51601108 and 52071191)
the Natural Science Foundation of Shandong Province,China(No.ZR2020ME011)。
关键词
镁合金
酸预处理
水滑石
金属间颗粒
蒸气涂层
耐蚀性
magnesium alloy
acid pretreatment
layered double hydroxide
intermetallic particles
steam coating
corrosion resistance
