Acta Metallurgica Sinica (English Letters) >
Mechanical assisted electroless barrel-plating Ni-P coatings on magnesium alloy
Received date: 2008-07-15
Revised date: 2008-10-24
Online published: 2009-10-10
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℃ 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.
Zhaoxia PING , Juntao YUAN , Yedong HE , Xiaogang LI . Mechanical assisted electroless barrel-plating Ni-P coatings on magnesium alloy[J]. Acta Metallurgica Sinica (English Letters), 2009 , 22(3) : 225 -232 . DOI: 10.1016/S1006-7191(08)60093-9
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