CORROSION-RESISTANCE OF ZN-CO ALLOY COATINGS

被引：25
|
作者：
FRATESI, R
ROVENTI, G
BRANCA, C
SIMONCINI, S
机构：
[1] Dipartimento di Scienze dei Materiali e della Terra, Università di Ancona
来源：
SURFACE & COATINGS TECHNOLOGY | 1994年 / 63卷 / 02期
关键词：
D O I：
10.1016/S0257-8972(05)80013-1
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The corrosion behaviour of commercial zinc and Zn-Co alloy coatings, with and without chromate conversion treatment, was studied by means of salt spray tests and electrochemical tests in aerated 0.6 M NaCl solution at various pH values. At almost neutral pH values, the chromated Zn-Co coatings show a better corrosion resistance than that for conventional chromated zinc coatings, as a result of a particularly protective chromate conversion layer which increases both the cathodic and anodic overvoltages. At lower pH values, the corrosion resistance of both chromated zinc and chromated Zn-Co alloy decreases. This is attributed to the depolarization of the cathodic reaction (hydrogen reduction) and to the quick destruction of the chromate layer.
引用
收藏
页码：97 / 103
页数：7
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