温度和电流密度对AZ63镁合金牺牲阳极在淡水中电化学行为的影响  

EFFECT OF TEMPERATURE AND CURRENT DENSITY ON ELECTROCHEMICAL PERFORMANCE OF SACRIFICIAL MAGNESIUM ANODE AZ63 IN FRESH WATER

作　　者：曾爱平[1] 张承典[1] 徐乃欣[1] 

机构地区：[1]中国科学院上海冶金研究所,上海200050

出　　处：《腐蚀与防护》1999年第7期314-317,共4页Corrosion & Protection

摘　　要：用恒电流阳极放电和腐蚀形貌金相观察,考察了在淡水中温度20～80℃、电流密度0.015～1.20mA/cm^2的范围内,不同工作温度和电流密度下AZ63镁基合金牺牲阳极的电化学行为。结果表明:在淡水中,工作温度上升对AZ63镁阳极的电流效率和腐蚀形貌影响不大,工作电位略有负移;随阳极极化电流密度的增大,AZ63镁阳极的电流效率变化不大,工作电位正移明显,腐蚀形貌变得更加凹凸不平。在上述试验条件下没有发现镁阳极出现晶间腐蚀。Electrochemical performance of sacrificial magnesium anode AZ63 in fresh water was investigated by galvanostatic polarization measurements and morphological observation over the temperature range from 20℃to 80℃and the current density range from 0. 015mA/cm2 to 1. 20mA/cm2. The current efficiency and surface morphology after testing were not significantly affected by temperature, but increase in temperature shifted its potential towards negative slightly. The current density did not alter current efficiency while higher current density made the working potential more noble and altered corrosion morphology. Under all testing conditions the inter-granular corrosion was not observed on the magnesium anode.

关 键 词：温度 电流密度 镁合金 阳极 电化学 淡水装置 

分 类 号：TG174.41[金属学及工艺—金属表面处理]