Chrome-free surface treatments for magnesium alloy

被引：125

作者：

Umehara, H ^{[1
]}

Takaya, M

Terauchi, S

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058565, Japan

[2] Chiba Inst Technol, Narashino, Chiba 2750016, Japan

来源：

SURFACE & COATINGS TECHNOLOGY | 2003年 / 169卷

关键词：

magnesium alloy; chromium-free conversion; permanganate bath; film structure; corrosion resistance;

D O I：

10.1016/S0257-8972(03)00052-5

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Conversion coatings for magnesium have traditionally been based on immersion treatment in a solution containing hexavalent chromium compounds. However, the need for a replacement surface treatment has been strongly emphasized by the present environmental drive to eliminate hexavalent chromium. The development of permanganate bath chemical conversion coatings for magnesium alloys was studied, using mass gain measurements, measurements of corrosion potential, X-ray diffraction, X-ray photoelectron spectroscopy and microscopic examination. The chemical conversion coating obtained from a permanganate bath consists of a film, composed mainly of manganese oxides and magnesium oxide or hydroxide. Such films were found to be amorphous composite coatings. The corrosion resistance of permanganate chemical conversion coatings was comparable with that of chromating. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：666 / 669

页数：4

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