Preparation and property evaluation of electroless Ni-P coatings on AZ91D magnesium alloy
Taking a bath with basic nickel carbonate as the source of nickel,sodium hypophosphite as the reducing agent and citric acid as the complexing agent,the Ni-P coatings on AZ91D magnesium alloy were prepared.The influence of pH value of the bath on the content of phosphorus,microhardness and corrosion resistance of the deposits was examined.The XRD analysis results show that the Ni-P coatings plated under all conditions have a mixed microstructure of amorphous and nanocrystalline and undergo a phase transformation to crystalline nickel and nickel phosphide upon heat-treatment.The microhardness of the Ni-P coatings increases with the increase of pH value of the bath and has a maximum at pH=6.The potentiodynamic polarization test in 3.5％(mass fraction) NaCl solution reveals that the Ni-P coatings exhibit a very good corrosion resistance to protecting AZ91D magnesium alloy.
Ni-P coating AZ91D magnesium alloy preparation property evaluation
LI Xue-song ZHANG Wen-xue JIANG Zhong-hao
Laboratory of Automobile Materials,Department of Materials Science and Engineering,Jilin University, Laboratory of Automobile Materials,Department of Materials Science and Engineering,Jilin University, Laboratory of Automobile Materials,Department of Materials Science and Engineering,Jilin University,
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）