On the mechanism of the anodic protection of aluminium alloy AA5182 by emeraldine base coatings - Evidences of a galvanic coupling

被引：46
作者：
Cecchetto, Laura [1 ]
Delabouglise, Didier [1 ]
Petit, Jean-Pierre [1 ]
机构：
[1] Univ Grenoble 1, CNRS, Lab Electrochim & Physicochim Mat & Interfaces, INP Grenoble,UMR 5631,ENSEEG, F-38402 St Martin Dheres, France
来源：
ELECTROCHIMICA ACTA | 2007年 / 52卷 / 11期
关键词：
corrosion protection; aluminium; polyaniline; emeraldine base;
D O I：
10.1016/j.electacta.2006.10.009
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Aluminium AA5182 coupons covered by a polyaniline film in the emeraldine base (EB) form showed increasing corrosion potential and decreasing corrosion current as a function of the thickness of the polymer layer. The cathodic reaction was proved not limited by diffusion of species inside the electrolyte solution and oxygen had no effect on the electrochemical behaviour of the coated samples. An EB coating on indium tin oxide conducting layer appeared slightly electroactive in neutral media. The IR spectra of aluminium, coated samples, before and after heating in argon atmosphere, confirmed a redox reaction between the polymer film and the metal. This galvanic coupling can explain the good protective behaviour of emeraldine base against corrosion of aluminium. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：3485 / 3492
页数：8
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