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Microstructure and corrosion resistance of Ni–P gradient coating/stannate conversion film on magnesium alloy

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Abstract

A kind of novel Ni–P gradient coating/stannate conversion film was deposited on AZ91D magnesium alloy (AZ91D alloy) by an integrative method involved stannate conversion and electroless plating. The results indicated that using sodium hypophosphite concentrations varied as 5, 10, 22, 46, and 60 g/L in the bath, the electroless Ni–P gradient coating with typical cell morphologies was successfully prepared, and the structures transited from crystalline → microcrystalline → amorphous were obtained as increasing P content from 3.31 to 12.58 wt%. Furthermore, the corrosion morphologies, polarization curves, and the electrochemical impedance spectroscopy result indicated that the corrosion resistance of AZ91D alloy substrate was significantly improved and the corrosion resistance of Ni–P gradient coating was superior than that of stannate conversion film, which might be attributed to the gradient structure and rising P content with unique function.

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Acknowledgments

The work was supported by the National Natural Science Foundation of China (50172023) and the Shaanxi Industrial Science and Technology Research (2014K08-09) and the National College Students Innovation Training Program (201810704006).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi, 710054, People’s Republic of China

    Xiao-jia Liu, Wan-chang Sun, Ya-ru Dong, Min Ma, Ya-gang Zhang, Fei Yang & Yu-yao Ruan

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  1. Xiao-jia Liu
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  2. Wan-chang Sun
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  3. Ya-ru Dong
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  4. Min Ma
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Correspondence to Wan-chang Sun.

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Liu, Xj., Sun, Wc., Dong, Yr. et al. Microstructure and corrosion resistance of Ni–P gradient coating/stannate conversion film on magnesium alloy. Journal of Materials Research 34, 1064–1072 (2019). https://doi.org/10.1557/jmr.2019.21

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  • DOI: https://doi.org/10.1557/jmr.2019.21

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