Effect of the reinforced boron carbide particulate content of AA6061 alloy on formation of the passive film in seawater

被引：97
|
作者：
Katkar, V. A. [1 ]
Gunasekaran, G. [1 ]
Rao, A. G. [1 ]
Koli, P. M. [1 ]
机构：
[1] Naval Mat Res Lab, Thana 421506, India
来源：
CORROSION SCIENCE | 2011年 / 53卷 / 09期
关键词：
Metal matrix composites; EIS; Polarisation; SEM; AFM; Passive films; POINT-DEFECT MODEL; METAL-MATRIX COMPOSITES; ANODIC OXIDE-FILMS; CORROSION BEHAVIOR; PITTING BEHAVIOR; ELECTROCHEMICAL-BEHAVIOR; ELECTRONIC-PROPERTIES; AA2024/SICP COMPOSITES; PIT NUCLEATION; ALUMINUM;
D O I：
10.1016/j.corsci.2011.04.023
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of boron carbide (B4C) reinforcement on the corrosion of AA6061 alloy was studied by investigating passive films formed in seawater. The higher passive current and its potential-dependence for these composites indicated formation of porous passive film. Electrochemical impedance spectroscopy (EIS) graph suggests that the alloy surface is partly or totally active. The formed passive film is n-type semiconductor junction in nature. The difference between corrosion potential (E-corr) and potential at zero charge (RC) suggests that the chloride ions responsible for film breakdown exist within the passive film. A suitable mechanism is proposed for the passive film breakdown. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2700 / 2712
页数：13
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