The passivation behavior of sputter-deposited W-Ta alloys in 12M HCl

被引：37

作者：

Bhattarai, J ^{[1
]}

Akiyama, E ^{[1
]}

Habazaki, H ^{[1
]}

Kawashima, A ^{[1
]}

Asami, K ^{[1
]}

Hashimoto, K ^{[1
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai 98077, Japan

来源：

CORROSION SCIENCE | 1998年 / 40卷 / 4-5期

关键词：

alloy; XPS; polarization; passive films;

D O I：

10.1016/S0010-938X(97)00177-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A series of nanocrystalline or amorphous single solid solutions of W-Ta alloys are prepared by D.C. magnetron sputtering. The passivation behavior of these alloys is studied by immersion test, electrochemical measurements and X-ray photoelectron spectroscopy (XPS) analysis. The W-Ta alloys are passivated spontaneously and show significantly high corrosion resistance in 12 M HCl at 30 degrees C. Their corrosion rates are about two orders of magnitude lower than that of sputter-deposited tungsten and are lower than that of sputter-deposited tantalum. XPS analysis shows that tantalum is concentrated in both the air-formed films and the passive films formed spontaneously on the alloys after long time immersion in 12 M HCl. The surface films are composed of double oxyhydroxides of Ta5+ and W4+ ions. The formation of spontaneous passive film composed of a double oxyhydroxide of tungsten and tantalum ions is responsible for high corrosion resistance of the W-Ta alloys in concentrated hydrochloric acid solution. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.

引用

页码：757 / 779

页数：23

共 62 条

[1] THE EFFECT OF ION ETCHING ON SURFACE-COMPOSITION AND CHEMICAL-STATE [J].