Corrosion protection of AZ91 magnesium alloy by anodizing in niobium and zirconium-containing electrolytes

被引：105

作者：

Ardelean, H. ^{[1
]}

Frateur, I. ^{[1
]}

Zanna, S. ^{[1
]}

Atrens, A. ^{[2
]}

Marcus, P. ^{[1
]}

机构：

[1] Ecole Natl Super Chim Paris, Lab Phys Chim Surfaces, UMR CNRS ENSCP 7045, F-75005 Paris, France

[2] Univ Queensland, Brisbane, Qld 4072, Australia

来源：

CORROSION SCIENCE | 2009年 / 51卷 / 12期

关键词：

Magnesium; Cyclic voltammetry; EIS; XPS; Anodic films; RAY PHOTOELECTRON-SPECTROSCOPY; IMPEDANCE SPECTROSCOPY; CONVERSION COATINGS; PURE MAGNESIUM; RESISTANCE; FILMS; XPS; BEHAVIOR; CERIUM; MG;

D O I：

10.1016/j.corsci.2009.08.030

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new Nb + Zr-based anodized coating was designed for the corrosion protection of AZ91 magnesium alloy. Polarization curves and electrochemical impedance diagrams plotted in Na2SO4 electrolyte showed its high protective effect. Analysis of the chemical composition by X-ray photoelectron spectroscopy indicated that the coating mainly consisted of (i) magnesium metaborate and metaphosphate, (ii) MgF2 and ZrF4, and (iii) Nb2O5, ZrO2 and MgO. A higher concentration of fluorine at both interfaces and an enrichment in Zr compared to Nb were revealed by SEM and EDS analyses. Thus, Zr-based compounds and MgF2 play a key role in the anti-corrosion ability of the coating. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：3030 / 3038

页数：9

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