Effect of Native Oxide Film on Commercial Magnesium Alloys Substrates and Carbonate Conversion Coating Growth and Corrosion Resistance

Materials

Sebastián Feliu²  Alejandro Samaniego²  Elkin Alejandro Bermudez³  Amir Abdelsami El-Hadad¹  Irene Llorente² 

[1] Physics Department, Faculty of Science, Al-Azhar University, Nasr City 11884, Cairo, Egypt; E-Mail:;Centro Nacional de Investigaciones Metalúrgicas CSIC, Avda. Gregorio del Amo 8, Madrid 28040, Spain; E-Mails:;Departamento de Ciencias de los Materiales, Simon Bolivar University, Baruta, Caracas 1080-A, Venezuela; E-Mail:

关键词: magnesium;    XPS;    SEM;    passivity;    segregation;   

DOI  :  10.3390/ma7042534

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland