Mechanical assisted electroless barrel-plating Ni-P coatings on magnesium alloy
来源期刊：Acta Metallurgica Sinica2009年第3期
论文作者：Juntao YUAN Zhaoxia PING Yedong HE Xiaogang LI
Key words：Mechanically assisted electroless barrel-plating; Ni-P coating; Crystallization; Corrosion resistance; Microhardness;
Abstract: 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.
Juntao YUAN1，Zhaoxia PING1，Yedong HE1，Xiaogang LI1
(1.Beijing Key Laboratory for Corrosion,Erosion and Surface Technology,University of Science and Technol-ogy Beijing,Beijing 100083,China)
Abstract: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.
Key words:Mechanically assisted electroless barrel-plating; Ni-P coating; Crystallization; Corrosion resistance; Microhardness;
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