Plating Bath Composition Optimization and Corrosion Resistance of Ni-Sn-Mn Amorphous Coating Prepared by Electrodeposition

doi:10.11933/j.issn.1007-9289.20170615001

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China Surface Engineering ›› 2017, Vol. 30 ›› Issue (6) : 84-94. DOI: 10.11933/j.issn.1007-9289.20170615001

MENG Qing-bo, QI Hai-dong, LU Shuai, GUO Zhao, LI Yun-gang and YANG Hai-li

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Abstract

To improve the corrosion resistance of mild steel in marine environment, Ni-Sn-Mn alloy coatings were prepared on the surface of Q235 steel by pulse electrodeposition. Plating bath composition was optimized by orthogonal experiment method. Surface morphology, element content, phase structure, and corrosion resistance of the Ni-Sn-Mn coatings were evaluated by scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS), X-ray diffraction (XRD), Tafel curve and electrochemical impedance spectroscopy (EIS). The results show that the optimized plating solution consists of 10 g/L nCl₂·2H₂O, 55 g/L iSO₄·6H₂O, 50 g/L MnSO₄·H₂O and 160 g/L Na₃C₆H₅O₇·2H₂O Ni-Sn-Mn coating deposited under optimized plating bath composition has an amorphous structure. Uniform and fine cellular particles are distributed densely on the surface of the coating. The mass fractions of Ni, Sn and Mn in the coating are 68.59%, 21.57% and 9.84%, respectively. Compared with the Ni-Sn coating, the Ni-Sn-Mn coating exhibits better corrosion resistance in 3.5% NaCl solution shown by a more positive corrosion potential (-0.346 V), a lower corrosion current density of 2.816×10^-8 A/cm², and a bigger charge transfer resistance of 12 580 Ω·cm².

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pulse electrodeposition;Ni-Sn-Mn amorphous coating;plating bath composition;phase structure;corrosion resistance

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MENG Qing-bo, QI Hai-dong, LU Shuai, GUO Zhao, LI Yun-gang and YANG Hai-li. Plating Bath Composition Optimization and Corrosion Resistance of Ni-Sn-Mn Amorphous Coating Prepared by Electrodeposition[J]. China Surface Engineering, 2017, 30(6): 84-94 https://doi.org/10.11933/j.issn.1007-9289.20170615001

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2023-12-19

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