Effects on Corrosion Resistance of Ce-Sealed Ni-P Coatings with Ni-Low P and Ni-Medium P

Abstract:

The post-treatment with Ce-rich sealing of Ni-P coating (Ce-sealed Ni-P coating) was developed on Al surface. Effects of corrosion resistance with different phosphorus contents in the Ni-P coatings were investigated in this paper. The results of the polarization curves show that the Ce-sealed Ni-(10wt.%)P coatings have the higher corrosion potential (Ecorr) and the lower corrosion current (i_corr), indicating that this coating i_{Subscript text}s a better corrosion inhibitor than Ni-(3wt.%)P coating. These results demonstrate that the P content plays an obvious role on improving the corrosion resistance of Ni-P coatings. It is results of SEM analysis shows that the Ce-sealed Ni-(3wt.%)P coating has not obvious micro-cracks, the Ce-sealed Ni-(10wt.%)P surface with some micro-cracks are appeared on Ce-rich coating. But this micro-cracks phenomenon of Ce-rich coating can not effect on corrosion resistance. Otherwise, there are no peaks of Ce-riched coatings in both XRD patterns, because too less Ce elements and non-crystal tendency is more serious on these coatings.

• Periodical: Advanced Materials Research (Volumes 472-475)
• Pages: 151-156
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.472-475.151
• Online since: February 2012
• Authors: Chun Yu Wang, Huan Ran Li, Wei Zhang, Yang Yu, Guang Wu Wen
• Keywords: Ce-Sealing, Corrosion Resistance, Ni-P Coating, P Contents

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