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Materials 2014, 7(4), 2534-2560;

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

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
Physics Department, Faculty of Science, Al-Azhar University, Nasr City 11884, Cairo, Egypt
Author to whom correspondence should be addressed.
Received: 4 February 2014 / Revised: 19 March 2014 / Accepted: 21 March 2014 / Published: 28 March 2014
(This article belongs to the Special Issue Light Alloys and Their Applications)
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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. View Full-Text
Keywords: magnesium; XPS; SEM; passivity; segregation magnesium; XPS; SEM; passivity; segregation

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Feliu, Jr., S.; Samaniego, A.; Bermudez, E.A.; El-Hadad, A.A.; Llorente, I.; Galván, J.C. Effect of Native Oxide Film on Commercial Magnesium Alloys Substrates and Carbonate Conversion Coating Growth and Corrosion Resistance. Materials 2014, 7, 2534-2560.

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