Porosity evaluation of protective coatings onto steel, through electrochemical techniques

被引:336
作者
Creus, J [1 ]
Mazille, H [1 ]
Idrissi, H [1 ]
机构
[1] Inst Natl Sci Appl Lyon, Lab Physicochim Ind, F-69621 Villeurbanne, France
关键词
corrosion; electrochemical behaviour; metallic coatings; porosity;
D O I
10.1016/S0257-8972(99)00659-3
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Various electrochemical techniques, usually used to characterise the corrosion resistance of coated steel, are compared in order to evaluate the porosity of various protective coatings (Al, Ti, TiN or CrN). The porosity significantly influences the corrosion behaviour of the coated steel, tested in saline environment, and some gaps are evident in the porosity values determined from these techniques. These heterogeneous data are interpreted in terms of intrinsic behaviour of each coating and of galvanic effects between the relevant coating and the substrate. The advantages and drawbacks of each electrochemical technique are underlined in correlation with the type of tested coating. (C) 2000 Elsevier Science S.A. All rights reserved.
引用
收藏
页码:224 / 232
页数:9
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