In this paper, silver was electroless-plated onto nickel-phosphorus (Ni-P) to improve its microbialcorrosion resistance. The microbial corrosion behaviour of nickel-phosphorus-silver (Ni-P-Ag) inartificial marine environments with Desulfovibrio desulfuricans was experimentally investigated.Fluorescence microscopy (FM), scanning electron microscopy (SEM), and X-ray fluorescence (XRF)were used to analyse the colonization of sulphate-reducing bacteria (SRB). The results indicate that NiP-Ag could not inhibit the growth of SRB, which were still able to proliferate wihin a short period.Based on the electrochemical impedance spectroscopy (EIS) results, the potentiodynamic curves of NiP-Ag were concentrated from 1 d to 31 d with almost no shift in the negative direction. The corrosionpotentials and lgIcorr of the Ni-P-Ag potentiodynamic curves changed slowly. The Nyquist and Bodeplots of Ni-P-Ag coating in seawater containing SRB were both relatively stable. According to theequivalent circuits, the Rct of Ni-P-Ag decreased slowly from 5.75 kΩ·cm-2to 2.35 kΩ·cm-2. Theresults showed that the microbial corrosion resistance of silver coating is obvious. Although silvercoating could not inhibit SRB reproduction, Ni-P-Ag can effectively resist SRB corrosion..
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