Mechanical assisted electroless barrel-plating Ni-P coatings on magnesium alloy

金属学报(英文版), 2009, 22(3): 225-232. doi: 10.1016/S1006-7191(08)60093-9

^1, , ^2, , ^3, , ^4,

1.Beijing Key Laboratory for Corrosion,Erosion and Surface Technology,University of Science and Technol-ogy Beijing,Beijing 100083,China

2.Beijing Key Laboratory for Corrosion,Erosion and Surface Technology,University of Science and Technol-ogy Beijing,Beijing 100083,China

3.Beijing Key Laboratory for Corrosion,Erosion and Surface Technology,University of Science and Technol-ogy Beijing,Beijing 100083,China

4.Beijing Key Laboratory for Corrosion,Erosion and Surface Technology,University of Science and Technol-ogy Beijing,Beijing 100083,China

基金项目: the National R&D Infrastructure and Facility Development Program of China(2005DKA10400-Z1) 国家自然科学基金(50671006)

Mechanical assisted electroless barrel-plating Ni-P coatings on magnesium alloy

Zhaoxia PING ^1, , Juntao YUAN ^2, , Yedong HE ^3, , Xiaogang LI ^4,

1.Beijing Key Laboratory for Corrosion,Erosion and Surface Technology,University of Science and Technol-ogy Beijing,Beijing 100083,China

2.Beijing Key Laboratory for Corrosion,Erosion and Surface Technology,University of Science and Technol-ogy Beijing,Beijing 100083,China

3.Beijing Key Laboratory for Corrosion,Erosion and Surface Technology,University of Science and Technol-ogy Beijing,Beijing 100083,China

4.Beijing Key Laboratory for Corrosion,Erosion and Surface Technology,University of Science and Technol-ogy Beijing,Beijing 100083,China

Keywords： Mechanically assisted electroless barrel-plating

A mechanically assisted electroless barrel-plating Ni-P was carried out in a rolling drum containing Mg alloy specimens and ceramic balls, which was submerged in a bath containing electroless plating solution. It is demonstrated that the Ni-P coatings deposited by this novel technique have a crystallized Ni-P solid solution structure,showing fine-grains, higher hardness, and higher corrosion resistance compared with the conventional electroless plated amorphous Ni-P coatings. After heat treatment at 400 ～C for 1 h, the structure of such Ni-P coatings were transformed to a structure with Ni-Ni3P double phases, and cracks in these coatings could not-be observed,whereas cracks appeared seriously in the conventional electroless plated Ni-P coating after same heat treatment. Therefore, both hardness and corrosion resistance of these Ni-P coatings can be improved further by heat treatment. All of these beneficial effects can be attributed to the role of mechanical attrition during the mechanically assisted electroless barrel-plating process.

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Mechanical assisted electroless barrel-plating Ni-P coatings on magnesium alloy

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