对镁-铝合金β相模型合金在不同浓度的Cl-溶液环境中的腐蚀电化学行为进行研究. 结果表明, 随着Cl-浓度的增加, β相的自腐蚀电位依次降低. 但β相与α相之间的电位差没有随Cl-浓度的增加递增. β相在不同浓度的Cl-溶液中均能发生钝化, 随Cl-浓度的增加点蚀击破电位降低, 相应表面膜中含Mg的腐蚀产物种类也增多. 在不同浓度 Cl-溶液环境中, β相模型合金的腐蚀电化学结果可以揭示 β相的微电偶作用.
The electrochemical behavior of a model β phase Mg-Al alloy was investigated in solutions with different concentrations of Cl- in comparison with model $\alpha$ phase alloy. The results indicated that the increase of Cl- concentration may decrease the corrosion potential of β phase. However, there is no distinct in potential difference between β phase and α phase. The β phase may be passivated in solutions with different concentrations of Cl-. With the increasing of Cl- concentration the pitting breakdown potential of β phase slightly lower. There is excess Cl- doping the formed corrosion scales on β phase surface as the Cl- concentration increases. It is expected that β phase in magnesium-aluminum alloy may play certain role in micro galvanic couple with substrate in atmosphere corrosion in sodium chloride polluted environments.
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