镁合金阳极的析氢、效率与电偶腐蚀放大效应  

Hydrogen evolution,efficiency and exacerbated galvanic corrosion damage of magnesium alloy anode

作　　者：黄居峰 宋光铃 HUANG Ju-feng;SONG Guang-ling(Center for Marine Materials Corrosion and Protection,College of Materials,Xiamen University,Xiamen 361005,Fujian,China;State Key Laboratory of Physical Chemistry of Solid Surfaces,Xiamen University,Xiamen 361005,Fujian,China;School of Mechanical and Mining Engineering,The University of Queensland,Brisbane 4072,Australia)

机构地区：[1]厦门大学材料学院海洋材料腐蚀防护研究中心,福建厦门361005 [2]厦门大学固体表面物理化学国家重点实验室,福建厦门361005 [3]昆士兰大学机械和采矿学院,澳大利亚布里斯班4072

出　　处：《材料工程》2021年第12期48-56,I0001,共10页Journal of Materials Engineering

基　　金：国家自然科学基金重点项目(51731008);国家自然科学基金面上项目(51671163)。

摘　　要：为了解决镁工程应用公认的主要障碍——电偶腐蚀,探明镁合金固有的负差数效应导致的阳极溶解异常放大和阳极析氢现象,本文通过阳极化镁的析氢速率、镁丝阵列电极、材料表面微观技术的测量,以及部分膜单价镁离子机制的理论推导和分析,发现阳极析氢对镁的“负差数效应”和电偶腐蚀有极强的加速作用;电极表面的微电偶并非强阳极极化条件下镁阳极效率低的根本原因;锌离子的“次生效应”对镁阳极过程有一定的抑制作用;镁表面膜的保护性是决定阳极析氢、电流效率、电偶腐蚀放大效应的关键因素。To address the galvanic corrosion issue that is critically limiting the practical application of Mg alloys,the negative difference effect(NDE),anodic dissolution efficiency,and anodic hydrogen evolution were investigated by means of the hydrogen collection,Mg wire array electrode,and surface microanalyses based on the model of monovalent Mg+dissolution at film breaks.The results show that anodic hydrogen evolution is closely associated with the negative difference effect,while the micro-galvanic process of Mg is not responsible for the low anodic current efficiency,and the secondary effect of dissolved zinc ions can to some degree reduce the anodic current efficiency.The protectiveness of the surface film is the most important factor determining the current efficiency,anodic hydrogen evolution,and galvanic corrosion damage.

关 键 词：镁合金 析氢 负差数效应 阳极效率 电偶腐蚀 

分 类 号：TG178[金属学及工艺—金属表面处理]