Abstract The effects of Mg on the anodic dissolution behavior of the 55mass%Al-Zn coating layer were determined by in situ observation during galvanostatic polarization. The Zn-‍rich phases were observed to corrode at lower potentials than the dissolution potential region of the Al-rich matrix phases, and the dissolution duration of the Zn-rich phases was prolonged by Mg addition. Moreover, the corrosion products of the 55mass%Al-Zn-Mg coating layer were suggested to inhibit the oxygen reduction reaction on the steel substrate. The sacrificial corrosion protection mechanisms due to the addition of Mg to the 55mass%Al-‍Zn coating layer were discussed.

中文翻译：

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镁对55mass%Al-Zn-Mg涂层钢牺牲腐蚀保护作用的微电化学研究

摘要 通过恒电流极化过程中的原位观察，确定了Mg对55mass%Al-Zn镀层阳极溶解行为的影响。观察到富锌相在比富铝基体相的溶解电位区更低的电位下腐蚀，并且富锌相的溶解持续时间因镁的添加而延长。此外，55mass%Al-Zn-Mg涂层的腐蚀产物被认为抑制了钢基体上的氧还原反应。讨论了在 55mass%Al-Zn 涂层中添加 Mg 的牺牲腐蚀保护机制。