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

被引：32

作者：

Chen Xiao-ming ^{[1
]}

Li Guang-yu ^{[1
]}

Lian Jian-she ^{[1
]}

机构：

[1] Jilin Univ, Coll Mat Sci & Engn, Key Lab Automobile Mat, Minist Educ, Changchun 130025, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2008年 / 18卷

关键词：

corrosion resistance; electroless deposition; Ni-W-P alloy; acid-sulfate nickel;

D O I：

10.1016/S1003-6326(10)60225-7

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

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

页码：S323 / S328

页数：6

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