The corrosion behavior of Ni-P coating in 3.5 wt% NaCl solution containing CO2 and H2S was investigated using electrochemical methods and surface characterization techniques. The results show that CO2 can promote the corrosion of Ni-P coating, and the corrosion resistance of the coating significantly decreases with the co-existence of the two gases, implying the accelerating effect of H2S on corrosion. Moreover, H2S also promotes the electrolyte penetration through the coating, resulting in the severe localized corrosion and coating disbonding after the long-term immersion. Nickel hydroxide and nickel sulfide are the main corrosion products in CO2/H2S environment.

Subject
Nickel coatings, Energy dispersive X-ray spectroscopy, Coatings, Corrosion rate, Surface morphology, X-ray spectroscopy, Corrosion products, Sodium chloride solution, Corrosion behavior, Carbon steel, Immersion, Nickel, Linear polarization resistance
Keywords:
Electroless Ni-P coating, CO2, H2S corrosion, EIS, SEM, electrolyte penetration
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2019
Association for Materials Protection and Performance (AMPP)
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