Novel hybrid sol-gel coatings for corrosion protection of AZ31B magnesium alloy

被引：230

作者：

Lamaka, S. V. ^{[1
,3
]}

Montemor, M. F. ^{[3
]}

Galio, A. F. ^{[1
,2
]}

Zheludkevich, M. L. ^{[1
]}

Trindade, C. ^{[2
]}

Dick, L. F. ^{[2
]}

Ferreira, M. G. S. ^{[1
,3
]}

机构：

[1] Univ Aveiro, CICECO, Dept Ceram & Glass Engn, P-3810193 Aveiro, Portugal

[2] Univ Fed Rio Grande do Sul, BR-9004006 Porto Alegre, RS, Brazil

[3] Univ Tecn Lisboa, IST, ICEMS, P-1049001 Lisbon, Portugal

来源：

ELECTROCHIMICA ACTA | 2008年 / 53卷 / 14期

关键词：

sol-gel coating; magnesium alloy; AZ31; B; corrosion; EIS;

D O I：

10.1016/j.electacta.2008.02.015

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

This work aims to develop and study new anticorrosion films for AZ31B magnesium alloy based on the sol-gel coating approach. Hybrid organic-inorganic sols were synthesized by copolymerization of epoxy-siloxane and titanium or zirconium alkoxides. Tris(trimethylsilyl) phosphate was also used as additive to confer additional corrosion protection to magnesium-based alloy. A sol-gel coating, about 5-mu m thick, shows good adhesion to the metal substrate and prevents corrosion attack in 0.005 M NaCl Solution for 2 weeks. The sol-gel coating system doped with tris(trimethylsilyl)-phosphate revealed improved corrosion protection of the magnesium alloy due to formation of hydrolytically stable Mg-O-P chemical bonds. The structure and the thickness of the solgel film were characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The corrosion behaviour of AZ31B substrates pre-treated with the sol-gel derived hybrid coatings was tested by electrochemical impedance spectroscopy (EIS). The chemical composition of the silylphosphate-containing sol-gel film at different depths was investigated by X-ray photoelectron spectroscopy (XPS) with depth profiling. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：4773 / 4783

页数：11

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