吉林大学学报(工学版) ›› 2010, Vol. 40 ›› Issue (06): 1562-1566.

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Electroless NiWP coating on magnesium alloy

ZHANG Wen-xue1,JIANG Zhong-hao2,LIAN Jian-she2   

  1. 1.College of Materials Science and Engineering,Chang’an University,Xi’an 710064,China;2.College of Materials Science and Engineering,Jilin University,Changchun 130022,China
  • Received:2008-12-10 Online:2010-11-01 Published:2010-11-01

Abstract:

Electroless NiWP coating with high content of W has been developed on chromiumfree pretreated AZ91D magnesium alloy by using an alkalinecitratebased baths, in which nickel sulphate and sodium tungstate were used as metal ion sources, and sodium hypophosphite was used as a reducing agent. One important modification of the NiWP electroless bath is the addition of sodium carbonate, which works as complexing agent, accelerator and buffer. Codeposition of tungsten resulted in ternary NiWP coating with phosphorus content of 4.84 wt.% and tungsten content of 4.5 wt.%, respectively. Both the electrochemical analysis and the porosity test revealed that the ternary NiWP coating exhibited good corrosion resistance in protecting magnesium alloy.

Key words: materials failure and protection, magnesium alloy, electroless deposition, nickelbased alloy, corrosion resistance

CLC Number: 

  • TG174.4
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