Effect of rare earth addition on structure and properties of Ni-P coating on SiCp/Al composites

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• 作者：Jianzhong LI ; Yanwen TIAN ; Ying LI ; Xiangrong WANG
• 关键词：SiCp/Al composites ; electroless plating ; corrosion resistance ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2010
• 出版时间：October 2010
• 年：2010
• 卷：28
• 期：5
• 页码：769-773
• 全文大小：453 K

文摘

The aim of this work was to improve the properties of Ni-P coating on SiCp/Al composites. The effect of rare earths addition on Ni-P coating structure was investigated by means of scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD) and electrochemistry methods. The results showed that as Y or La concentration was 0.15 g/L in plating solution, the highest value of deposition rate of Ni-P coating was found. And the structure of the obtained coating was modified to part of crystalline state from single amorphous Ni, such as Ni₃Y or Ni₃La, Ni₅Y or Ni₅La, Ni₂P₂Y or Ni₂P₂La. The properties of the Ni-P-RE alloy coating were improved greatly, for example, crystalline size became fine and compact, the free corrosion potential of the coating enhanced remarkably. Y had a better effect on the properties of the coating compared with La.