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

作者：Ping Zhaoxia; Yuan Juntao; He Yedong^*; Li Xiaogang

来源：Acta Metallurgica Sinica (English Letters), 2009, 22(3): 225-232.

DOI：10.1016/S1006-7191(08)60093-9

• Mechanically assisted electroless barrel-plating
• Ni-P coating
• Crystallization
• Corrosion resistance
• Microhardness

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 degrees C for 1 h, the structure of such Ni-P coatings were transformed to a structure with Ni-Ni(3)P 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.

• 出版日期2009-6
• 单位北京科技大学