海水中Hg^(2+)含量对6063铝合金表面铝锌改性层腐蚀性能的影响  

Effect of Hg^(2+)Concentration in Seawater on Corrosion of Surface Modified Layer of 6063 Aluminum Alloy

作　　者：段天应 徐哲 李志强[1] 李晟[1] 王延枝 张明辉[1] 李培跃[1] DUAN Tianying;XU Zhe;LI Zhiqiang;LI Sheng;WANG Yanzhi;ZHANG Minghui;LI Peiyue(Luoyang Ship Material Research Institute,Luoyang 471023,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《材料开发与应用》2020年第6期24-29,共6页Development and Application of Materials

基　　金：河南省重大科技专项(151100210300)。

摘　　要：通过浸泡腐蚀实验和利用电化学表征手段,研究了海水中重金属Hg^(2+)含量对铝锌改性涂层耐腐蚀性能的影响.结果表明,随着Hg^(2+)含量的增大,腐蚀电流逐渐增大,阻抗谱高频区呈现的容抗弧逐渐减小,阻抗谱低频区出现的感抗消失,表明腐蚀加剧.当Hg^(2+)含量低于0.5 μg/L时,自腐蚀电位基本处于同等水平,腐蚀倾向性相近.而当Hg^(2+)含量超过0.5 μg/L后,腐蚀电位逐渐降低,腐蚀的倾向性随Hg^(2+)浓度增大而加剧.浸泡腐蚀实验结果表明,随着Hg^(2+)浓度的增大,平均腐蚀速率逐渐增大.当浓度低于0.5 μg/L时,腐蚀速率不超过20 μm/a.Hg^(2+)浓度在0.5~15 μg/L范围内,腐蚀速率基本在20~35 μm/a之间.The effect of heavy metal Hg^(2+)concentration on the seawater corrosion resistance of the aluminum-zinc coating was studied by immersion corrosion experiments and electrochemical means.According to the electrochemical test,it is found that as the Hg^(2+) content increases,the corrosion current gradually increases,the capacitive reactance arc presented in the high frequency region gradually decreases,and the inductive reactance disappears,indicating that the corrosion is accelerated.When the concentration is lower 0.5μg/L,the self-corrosion potential is basically at the same level,indicating similar corrosion tendencies.However,when the content of Hg^(2+) exceeds 0.5μg/L,the corrosion potential gradually decreases,indicating that the tendency of corrosion increases with the increase of Hg^(2+) concentration.The immersion corrosion experiment shows that with the increase of Hg^(2+)concentration,the average corrosion rate gradually increases.When the concentration is lower 0.5μg/L,the average corrosion rate does not exceed 20μm/a.In the Hg^(2+) concentration range of 0.5〜15μg/L,the corrosion rate is basically between 20-35μm/a.

关 键 词：Hg^(2+)含量 铝锌涂层 腐蚀性能 

分 类 号：TG178[金属学及工艺—金属表面处理]