Effect of zirconia sol in electrolyte on the characteristics of microarc oxidation coating on AZ91D magnesium

被引：46

作者：

Tang, Mingqi ^{[1
]}

Liu, Huicong ^{[1
]}

Li, Weiping ^{[1
]}

Zhu, Liqun ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Mat & Performance, Beijing 100191, Peoples R China

来源：

MATERIALS LETTERS | 2011年 / 65卷 / 03期

关键词：

Magnesium alloy; Zirconia sol; Oxidation; Surfaces; Corrosion; CORROSION-RESISTANCE; SILICA SOL; ALLOY; FLUORIDE; BEHAVIOR; FILMS;

D O I：

10.1016/j.matlet.2010.09.041

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microarc oxidation coatings were prepared on AZ91D magnesium alloy in a Na2SiO3-KOH electrolyte with and without zirconia sol, respectively. The effect of zirconia sol as an additive in the electrolyte on the surface morphologies, compositions, structures, and corrosion resistances of the coatings were investigated. It was found that the coating formed in the Na2SiO3-KOH electrolyte with zirconia sol has more uniform morphology, less micropores and cracks than that formed in an electrolyte without zirconia sol. The phase compositions of the coatings also varied after addition of zirconia sol in the electrolyte, owing to the participation of zirconia sol in the reaction and its incorporation into the oxide coating, and Zr existed in the form of Mg2Zr5O12. The results of potentiodynamic polarization analysis show that the coating formed in the electrolyte with zirconia sol increases significantly corrosion resistance for magnesium alloy. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：413 / 415

页数：3

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