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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。
Using constant current anodic discharge and corrosion morphology of the metallographic observation, investigated in fresh water temperature 20 ~ 80 ℃, the current density of 0.015 ~ 1.20mA / cm ~ 2 range, different operating temperature and current density AZ63 magnesium-based alloy sacrifices Electrochemical behavior of the anode. The results show that in fresh water, the working temperature increases slightly on the current efficiency and corrosion morphology of AZ63 magnesium anode, while the working potential is slightly negative. With the increase of anode polarization current density, the current efficiency of AZ63 magnesium anode does not change. Large, working potentials are moving significantly, the corrosion morphology becomes more rugged. In the above experimental conditions did not find magnesium anode intergranular corrosion.