Electrochemical behaviour of a Mg-rich primer in the protection of Al alloys

被引：118

作者：

Battocchi, D.

Simoes, A. M.

Tallman, D. E.

Bierwagen, G. P.

机构：

[1] N Dakota State Univ, Dept Coatings & Polymer Mat, Fargo, ND 58105 USA

[2] IST, Dept Chem Engn, P-1049001 Lisbon, Portugal

[3] N Dakota State Univ, Dept Chem, Fargo, ND 58105 USA

来源：

CORROSION SCIENCE | 2006年 / 48卷 / 05期

关键词：

Mg-rich primer; AA2024; AA7075; EIS; OCP; potentiodynamic polarization; sacrificial protection;

D O I：

10.1016/j.corsci.2005.04.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The electrochemical behaviour of Mg-rich primer on Al Alloys, AA2024 and AA7075, has been studied via Electrochemical Impedance Spectroscopy (EIS), Open Circuit Potential (OCP) and potentiodynamic polarization. Results showed that the Mg-rich primer provides sacrificial protection to the Al substrate by a two-stage mechanism. In a first stage, corrosion of aluminium is prevented by cathodic polarization, whereas at a later stage the precipitation of a porous barrier layer of magnesium oxide was observed. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1292 / 1306

页数：15

共 18 条

[1] Electrochemical behaviour of zinc-rich epoxy paints in 3% NaCl solution [J].