Abstract The present work investigated the effects of V2O5 on the microstructure and corrosion resistance of Al–Mg–Si alloy via plasma electrolysis (PE). For this purpose, the samples were subjected to PE in an alkaline-silicate solution under alternating current condition with a current density of 100 mA cm−2. The microstructures showed that both size and fraction of microdefects were suppressed considerably with increasing coating time. Such phenomena would be associated with the incorporation of V2O5 particles in the oxide layer whose concentration was observed to increase with increasing coating time. Thus, the electrochemical stability of the oxide layer was improved up to 3 order of magnitudes with the increase of vanadium content. The analysis of electrochemical behavior was interpreted on the basis of Tafel extrapolation and equivalent circuit model. The present method showed an extraordinary corrosion protection when compared to those of other surface treatment methods.

中文翻译：

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V2O5颗粒对Al-Mg-Si合金等离子电解微观结构和腐蚀行为的影响

摘要 本工作通过等离子体电解（PE）研究了 V2O5 对 Al-Mg-Si 合金显微组织和耐蚀性的影响。为此，在交流电流条件下，样品在碱性硅酸盐溶液中经受 PE，电流密度为 100 mA cm-2。微观结构表明，随着涂层时间的增加，微缺陷的尺寸和比例都得到了显着抑制。这种现象与氧化层中加入 V2O5 颗粒有关，观察到其浓度随着涂覆时间的增加而增加。因此，随着钒含量的增加，氧化层的电化学稳定性提高了3个数量级。基于Tafel外推法和等效电路模型解释电化学行为的分析。与其他表面处理方法相比，本方法显示出非凡的腐蚀保护。