Deposition of electroless Ni-P/Ni-W-P duplex coatings on AZ91D magnesium alloy

被引：3
|
作者：
陈晓明 [1 ]
李光玉 [1 ]
连建设 [1 ]
机构：
[1] Key Laboratory of Automobile Materials,Ministry of Education,College of Materials Science and Engineering,Jilin University
来源：
Transactions of Nonferrous Metals Society of China | 2008年 / 18卷 / S1期
关键词：
corrosion resistance; electroless deposition; Ni-W-P alloy; acid-sulfate nickel;
D O I：
暂无
中图分类号：
TG146.22 [];
学科分类号：
080502 ;
摘要：
The electroless Ni-P/Ni-W-P duplex coatings were deposited directly on AZ91D magnesium alloy by an acid-sulfate nickel bath.Nickel sulphate and sodium tungstate were used as metal ion sources and sodium hypophosphite was used as reducing agent.The coating was characterized for its structure,morphologies,microhardness and corrosion properties.The presence of dense and coarse nodules in the duplex coatings was observed by SEM and EDS.Tungsten content in Ni-P/Ni-W-P alloy is about 0.65%(mass fraction) and the phosphorus content is 8.18%(mass fraction).The microhardness of the coatings is 622 VHN.The coating shows good adhesion to the substrate.The results of electrochemical analysis,the porosity and the immersion test show that Ni-P/Ni-W-P duplex coatings possess noble anticorrosion properties to protect the AZ91D magnesium alloy.
引用
收藏
页码：323 / 328
页数：6
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