Chrome-free conversion layers on zinc alloy coatings - preliminary tests

被引：0
|
作者：
Winiarski, Juliusz [1 ]
Szczygiel, Bogdan [1 ]
机构：
[1] Wroclaw Univ Technol, Zaklad Inzynierii Powierzchni Katalizy & Korozji, Wroclaw, Poland
来源：
OCHRONA PRZED KOROZJA | 2009年 / 52卷 / 4-5期
关键词：
chromating; conversion coating; corrosion resistance; molybdate; citrate;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Molybdate conversion layers have been obtained on the Zn-Ni alloy electrogal-vanised steel from a solution containing sodium molybdate(VI) and sodium citrate, acidified with phosphoric acid. The layers were deposited at different bath temperatures and different pH values. Chromated samples were used as the reference in order to compare the corrosion resistance properties. The increasing bath's temperature causes decreasing corrosion resistance (bigger corrosion curents, smaller polarisation resistance) in 0,5 M NaCl environment. The best molybdate layers were obtained in temperature 25-40 degrees C. These layers are homogeneous and free of cracks.
引用
收藏
页码：174 / 176
页数：3
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