In this study, a high-phosphorus Ni-P coating was prepared by electroless deposition method. The characteristics and corrosion property of electroless Ni-P coating were investigated by surface analysis techniques and electrochemical measurements, and compared with L80 steel, corrosion resistant alloys such as 13Cr steel, 316L stainless steel, Inconel and 28Cr steel. The results showed that the high- phosphorus Ni-P coating with amorphous structure contained 88.3 wt.% Ni and 11.7 wt.% P, and improved the corrosion resistance of L80 steel substrate by more than 90 % in Cl-containing medium. The corrosion resistance of Ni-P coating was close to 13Cr steel but lower than Inconel, 316L stainless steel and 28Crsteel. Nevertheless Ni-P coating, similarto Inconel and 28Crsteel, had better resistance to pitting corrosion than 13Cr steel and 316L stainless steel in Cl-containing environment.

Subject
Nickel coatings, Electrochemical impedance spectroscopy, Steel surfaces, Materials, Nickel based alloys, Passive films, Phosphorus, Steel, Pitting, Corrosion protection, Corrosion resistance, Stainless steel, Potentiodynamic polarization
Keywords:
Electroless Ni-P coating, Corrosion resistant alloys, EIS, Polarization, Pitting corrosion
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2018
Association for Materials Protection and Performance (AMPP)
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