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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Preparation and property evaluation of
electroless Ni-P coatings on AZ91D magnesium alloy
LI Xue-song(李雪松)1, 2, ZHANG Wen-xue(张文雪)1, JIANG Zhong-hao(江中浩)1

1. Key Laboratory of Automobile Materials, Department of Materials Science and Engineering,
Jilin University, Changchun 130025, China;
2. College of Materials Science and Engineering, Changchun University of Technology, Changchun 130012, China

Abstract: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.

 

Key words: Ni-P coating; AZ91D magnesium alloy; preparation; property evaluation

ISSN 1672-7029
CN 43-1423/U

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