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Investigating Corrosion Performance and Corrosive Wear Behavior of Sol–gel/MAO-Coated Mg Alloy

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Abstract

In this study, a hydroxyapatite composite coating was prepared by a sol–gel technique on the micro-arc oxidation (MAO)-coated AZ31 Mg alloy to seal the micro-pores. The composite coating achieved a larger hardness value and two times thickness more than pure MAO coating. The corrosion and wear resistance of the sol–gel/MAO coating in simulated body fluid were investigated compared to MAO coating. It was found that the composite coating presented a positive corrosion potential and a lower corrosion current density than MAO coating. The sol–gel/MAO composite coating could provide more effective barrier against corrosive ions than single MAO coating for AZ31 alloy. In the wear tests, a ball-on-disk tribometer was used to study the effect of loads on the wear properties of the coatings at 37 °C. The wear resistance of sol–gel/MAO composite coatings was apparently superior to MAO coating. The wear mechanisms of abrasion and adhesion in composite coatings are investigated. Finally, two physical models for the corrosion and sliding wear mechanisms of sol–gel/MAO composite coatings are proposed, respectively.

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Acknowledgements

Y. Gu thanks the China Scholarship Council (CSC) for funding (201708110028). The supports from Graduate Innovation Project (17033981001/102) and Undergraduate Research Training Program (2015J00042) of Beijing Institute of Petrochemical Technology are greatly acknowledged. L. Zhang thanks the support from a startup fund of the University of Alaska Fairbanks.

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Correspondence to Yanhong Gu or Lei Zhang.

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Gu, Y., Zheng, X., Liu, Q. et al. Investigating Corrosion Performance and Corrosive Wear Behavior of Sol–gel/MAO-Coated Mg Alloy. Tribol Lett 66, 101 (2018). https://doi.org/10.1007/s11249-018-1052-8

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  • DOI: https://doi.org/10.1007/s11249-018-1052-8

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