4种镁合金在Cl^--NH4^+-NO3^-溶液体系中的腐蚀行为差异研究  

Difference in Corrosion Behavior of Four Mg-alloys in Cl^--NH4^+-NO3^-Containing Solution

作　　者：于浩冉 张文丽 崔中雨 YU Haoran;ZHANG Wenli;CUI Zhongyu(School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学材料科学与工程学院,青岛266100

出　　处：《中国腐蚀与防护学报》2020年第6期553-559,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51601182).

摘　　要：研究了化学组分和显微组织结构对AZ31,AZ91,AM60和ZK61等4种镁合金在含有不同浓度NH4NO3的0.1 mol/L NaCl溶液中腐蚀行为的影响。通过浸泡实验、电化学测试、SEM和CLSM表面分析等探讨了4种镁合金的腐蚀机理。结果表明,NH4NO3的存在会加快镁合金的腐蚀;并且由于在特定浓度范围内,Cl^-,NH4^+和NO3^-的协同作用,会发生自催化点蚀。不同镁合金的耐蚀性与合金的化学成分和显微组织密切相关。The effect of chemical composition and microstructure on the corrosion behavior of Mg-alloys AZ31,AZ91,AM60 and ZK61 in 0.1 mol/L sodium chloride solution(NaCl)containing different concentration of ammonium nitrate(NH4NO3)were investigated.The corrosion processes of the four Mg-alloys were studied by immersion tests,polarization curve measurement,SEM and CLSM.Results show that the addition of NH4NO3 accelerates the corrosion of the four alloys,whilst autocatalytic pitting corrosion occurs due to the synergistic effects of Cl^-,NH4^+,and NO3^-in solutions within a specific concentration range.The corrosion resistance of different Mg-alloys is closely related to the chemical composition and microstructure of the alloys.

关 键 词：镁合金 硝酸铵 自催化点蚀 化学组分 显微结构 

分 类 号：TG172[金属学及工艺—金属表面处理]