Enrichment of alloying elements in anodized magnesium alloys

被引：38

作者：

Bonilla, FA

Berkani, A

Skeldon, P

Thompson, GE

Habazaki, H

Shimizu, K

John, C

Stevens, K

机构：

[1] Univ Manchester, Inst Sci & Technol, Ctr Corros & Protect, Manchester M60 1QD, Lancs, England

[2] Hokkaido Univ, Grad Sch Engn, Kita Ku, Sapporo, Hokkaido 0608628, Japan

[3] Keio Univ, Univ Chem Lab, Yokohama, Kanagawa 223, Japan

[4] Poeton Ind Ltd, Gloucester GL4 3DN, England

来源：

CORROSION SCIENCE | 2002年 / 44卷 / 09期

基金：

英国工程与自然科学研究理事会;

关键词：

magnesium; anodizing; anodic films; enrichment;

D O I：

10.1016/S0010-938X(02)00018-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The possibility of enrichment of alloying elements in magnesium alloys as a consequence of growth of an anodic film has been investigated for sputtering-deposited Mg-0.4 at.% W and Mg-1.0 at.% W alloys. The alloys were anodized at 10 mA cm(-2) to various voltages, up to 150 V, in 3 M ammonium hydroxide/0.05 M ammonium phosphate electrolyte at 293 K. The alloys revealed enrichments of tungsten to at least 1.7 x 10(15) and 2.9 x 10(15) W atoms cm(-2) for the Mg-0.4 at.% W and Mg-1.0 at.% W alloys respectively. The enrichment behaviour appears to be similar to that in dilute aluminium alloys, which occurs for alloying elements with oxides having Gibbs free energies per equivalent for formation exceeding that for formation of alumina. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：1941 / 1948

页数：8

共 14 条

[1] MECHANISMS OF PASSIVITY OF NONEQUILIBRIUM AL-W ALLOYS [J].