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TY - JOUR TI - Study on Microbial Corrosion Resistance of Ni-P-Ag Coatings in Artificial Marine Environments Containing Sulphate-reducing Bacteria AU - College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China AU - Yang, Dazhang T2 - International Journal of Electrochemical Science AB - In this paper, silver was electroless-plated onto nickel-phosphorus (Ni-P) to improve its microbial corrosion resistance. The microbial corrosion behaviour of nickel-phosphorus-silver (Ni-P-Ag) in artificial 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 Ni-P-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 Ni-P-Ag were concentrated from 1 d to 31 d with almost no shift in the negative direction. The corrosion potentials and lgIcorr of the Ni-P-Ag potentiodynamic curves changed slowly. The Nyquist and Bode plots of Ni-P-Ag coating in seawater containing SRB were both relatively stable. According to the equivalent circuits, the Rct of Ni-P-Ag decreased slowly from 5.75 kΩ·cm-2 to 2.35 kΩ·cm-2. The results showed that the microbial corrosion resistance of silver coating is obvious. Although silver coating could not inhibit SRB reproduction, Ni-P-Ag can effectively resist SRB corrosion. DA - 2020/12// PY - 2020 DO - 10.20964/2020.12.18 DP - CrossRef SP - 11779 EP - 11790 LA - en SN - 14523981 UR - http://www.electrochemsci.org/abstracts/vol15/151211779.pdf Y2 - 2020/12/07/08:39:58 ER -