原生氧化膜对商用镁合金基体以及碳酸盐转化膜生长和耐蚀性的影响
Effect of Native Oxide Film on Commercial Magnesium Alloys Substrates and Carbonate Conversion Coating Growth and Corrosion Resistance.
作者信息
Feliu Sebastián, Samaniego Alejandro, Bermudez Elkin Alejandro, El-Hadad Amir Abdelsami, Llorente Irene, Galván Juan Carlos
机构信息
Centro Nacional de Investigaciones Metalúrgicas CSIC, Avda. Gregorio del Amo 8, Madrid 28040, Spain.
Departamento de Ciencias de los Materiales, Simon Bolivar University, Baruta, Caracas 1080-A, Venezuela.
出版信息
Materials (Basel). 2014 Mar 28;7(4):2534-2560. doi: 10.3390/ma7042534.
Possible relations between the native oxide film formed spontaneously on the AZ31 and AZ61 magnesium alloy substrates with different surface finish, the chemistry of the outer surface of the conversion coatings that grows after their subsequent immersion on saturated aqueous NaHCO₃ solution treatment and the enhancement of corrosion resistance have been studied. The significant increase in the amount of aluminum and carbonate compounds on the surface of the conversion coating formed on the AZ61 substrate in polished condition seems to improve the corrosion resistance in low chloride ion concentration solutions. In contrast, the conversion coatings formed on the AZ31 substrates in polished condition has little effect on their protective properties compared to the respective as-received surface.
研究了在具有不同表面光洁度的AZ31和AZ61镁合金基体上自发形成的原生氧化膜、它们随后浸入饱和碳酸氢钠水溶液处理后生长的转化膜外表面化学组成与耐蚀性增强之间的可能关系。在抛光条件下在AZ61基体上形成的转化膜表面上铝和碳酸盐化合物数量的显著增加，似乎提高了在低氯离子浓度溶液中的耐蚀性。相比之下，抛光条件下在AZ31基体上形成的转化膜与相应的原始表面相比，对其防护性能影响很小。
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