摘要
The gray phosphate coating was formed on AZ91D magnesium alloy from the zinc phosphating bath containing sodium metanitrobenzene sulphonate in about 4 min. The structure, surface morphologies and phase compositions of the phosphate coatings were observed and analyzed by using SEM, XRD and EDS. It is shown that the phosphate coating becomes denser and has less micro holes with increasing the concentration of sodium metanitrobenzene sulphonate in the bath in the range of 2.0 to 6.0 g/L. The addition of sodium metanitrobenzene sulphonate greatly increases the micro cathode sites for the formation of the phosphate coating and decreases the porosity of the coating.
The gray phosphate coating was formed on AZ91D magnesium alloy from the zinc phosphating bath containing sodium metanitrobenzene sulphonate in about 4 min. The structure, surface morphologies and phase compositions of the phosphate coatings were observed and analyzed by using SEM, XRD and EDS. It is shown that the phosphate coating becomes denser and has less micro holes with increasing the concentration of sodium metanitrobenzene sulphonate in the bath in the range of 2.0 to 6.0 g/L. The addition of sodium metanitrobenzene sulphonate greatly increases the micro cathode sites for the formation of the phosphate coating and decreases the porosity of the coating.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2006年第3期567-571,共5页
Transactions of Nonferrous Metals Society of China
基金
Project(2004CB619301) supported by the National Basic Research and Development Program and Project 985-Automotive Engineering of Jilin University
关键词
磷酸锌涂层
镁合金
磷酸盐处理
表面形态
结构
zinc phosphate coating
magnesium alloy
AZ91 D
sodium metanitrobenzene sulphonate
phosphating process
作者简介
Corresponding author： LIAN Jian-she; Tel： ＋86-431-5095875; E-mail： lianjs@jlu.edu.cn
