Corrosion protection of magnesium alloys by cerium, zirconium and niobium-based conversion coatings

被引：227
|
作者：
Ardelean, Helene [1 ]
Frateur, Isabelle [1 ]
Marcus, Philippe [1 ]
机构：
[1] Ecole Natl Super Chim Paris, CNRS, UMR 7045, Lab Physicochim Surfaces, F-75231 Paris 05, France
来源：
CORROSION SCIENCE | 2008年 / 50卷 / 07期
关键词：
magnesium; cyclic voltammetry; EIS; XPS; oxide coatings;
D O I：
10.1016/j.corsci.2008.03.015
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A new Ce, Zr and Nb-based conversion coating was designed for AZ91 and AM50 magnesium alloys. The corrosion protection provided by this coating was evaluated by electrochemical measurements (polarization curves, electrochemical impedance spectroscopy) in Na2SO4 electrolyte, and accelerated atmospheric corrosion tests (humid. SO2 polluted air, and salt spray). Its chemical composition was characterized by X-ray photoelectron spectroscopy (XPS). Electrochemical measurements showed that Mg alloys treated during 24 h in the Ce-Zr-Nb conversion bath exhibit: (i) increased corrosion potential, (ii) decreased corrosion and anodic dissolution current densities, and (iii) increased polarization and charge transfer resistances. The accelerated corrosion tests revealed excellent atmospheric corrosion resistance for all Ce-Zr-Nb-treated samples, with or without an additional layer of epoxy-polyamide resin lacquer or paint. XPS analysis showed that the coating includes CeO2, Ce2O3, ZrO2, Nb2O5, MgO, and MgF2 as main components. No significant modification of the chemical composition was observed after cathodic and anodic polarization in Na2SO4. This new coating provides improved corrosion resistance, and excellent paint adhesion. It offers an alternative to the chromate conversion coating for magnesium alloys. (c) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1907 / 1918
页数：12
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