Investigation on High-Phosphorus Electroless Ni–P Plating Technology of Stainless Steel

Abstract:

The high-phosphorus electroless Ni–P plating was coated on the surface of stainless steel. Five parameters, which have much effect on coating quality, were chosen to optimize the high-phosphorus electroless Ni–P plating technology in L₁₆(4⁵) orthogonal test. By means of x-ray diffraction and scanning electron microscopy, the morphologies and phase structures of coating were analyzed. Furthermore, the mechanical properties of coating were studied by micro-hardness tester and universal friction-wear testing machine. The results reveal that the optimal technical parameters are as follows: 20 g•L^-1 for NiSO₄, 23 g•L^-1 for NaH₂PO₂, 15 g•L^-1 for C₆H₅O₇Na₃•2H₂O, 8 g•L^-1 for H₂N-CH₂-COOH, 10g•L^-1 for CH₃COONa, 7 g•L^-1 for C₄H₆O₄, with PH value of 4.6, which leads to perfect coating quality. Besides, the P content is 11.64 wt.%, i.e. a high-P coating. The micro-hardness of the coating is 550.67 HV and the wear loss, 4.7×10^-3 g. The thermal shock test suggests that between coating and matrix exist a perfect cohesion, which is due to the homogenous and compact coating, with an amorphous structure, under the condition of the optimal technical parameters.

• Periodical: Advanced Materials Research (Volumes 291-294)
• Pages: 129-132
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.291-294.129
• Online since: July 2011
• Authors: Xiao Juan Wu, Zheng Jun Liu, Guo De Li
• Keywords: Ni-P, Orthogonal Test, Stainless Steel (SS)

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