Corrosion mechanisms of Zn(Mg, Al) coated steel in accelerated tests and natural exposure: 1. The role of electrolyte composition in the nature of corrosion products and relative corrosion rate

被引：110
作者：
Azevedo, M. Salgueiro [1 ,2 ]
Allely, C. [2 ]
Ogle, K. [1 ]
Volovitch, P. [1 ]
机构：
[1] Chim ParisTech, CNRS, ENSCP, F-75231 Paris 05, France
[2] ArcelorMittal Res SA, F-57283 Maizieres Les Metz, France
来源：
CORROSION SCIENCE | 2015年 / 90卷
关键词：
Metal coatings; Zinc; X-ray diffraction; Aluminium; Atmospheric corrosion; Weight loss; ZN-AL; ATMOSPHERIC CORROSION; RAIN WATER; CHEMICAL-COMPOSITION; MG COATINGS; ZINC; CHEMISTRY; SHEET; PRECIPITATION; REACTIVITY;
D O I：
10.1016/j.corsci.2014.05.014
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The corrosion rates and the nature of the corrosion products on Zn, ZnAl and ZnMgAl coatings on steel are determined for field exposures and for accelerated tests using different electrolytes. A new test electrolyte is proposed, containing NH4+ and HCO3-, which shows an improved correlation with field exposure in particular respecting the relative corrosion rates and the absence or at least delayed formation of layered double hydroxides. The effect of pH buffering by NH4+/HCO(3)(-)mixture on the difference in corrosion mechanisms of ZnMgAl coating in accelerated tests using a "standard" NaCl and using the new electrolyte is discussed. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：472 / 481
页数：10
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