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The Effects of Sodium Tungstate on the Characteristics of Microarc Oxidation Coating on Ti6Al4V

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Abstract

Microarc oxidized coatings on Ti6Al4V alloy are produced in a basic Na2SiO3-(NaPO3)6-NaAlO2 electrolyte with different concentrations of sodium tungstate. The effects of sodium tungstate on the characteristics of the coating are investigated through current–time response, microstructure, composition, hardness, bonding strength and antifriction measurements. The coating is mainly composed of Al2TiO5, TiO2, Al2O3 and amorphous substances regardless of the concentration of sodium tungstate. The sodium tungstate is transformed into trace amounts of WO3, which significantly promotes the growth of the coatings. The bonding strength and antifriction performance of the coatings are enhanced with the concentration of sodium tungstate less than 4 g/L, whereas excessive sodium tungstate results in a coarse outer layer with more microdefects, which deteriorates the wear resistance of the coating. Based on the results of scratch and wear test with energy-dispersive x-ray spectroscopy of the worn surface and debris, the optimal concentration of sodium tungstate doped into the electrolyte is identified, and this concentration yields superior tribological property. Excellent wear resistance is achieved by combining a high bonding strength and hardness with a less defective outer layer.

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Acknowledgments

This research was supported by National Natural Science Foundation of China [Grant Number 51771117] and Collaborative Innovation Center for Advanced Ship and Deep-sea Exploration (Shanghai Jiao Tong University). We are indebted to the Center for Advanced Electronic Materials and Devices (AEMD, Shanghai Jiao Tong University) for test supports.

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Authors and Affiliations

  1. State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Tong Zhou, Yuandi Ding, Qin Luo, Zhenbo Qin, Qi Zhang, Bin Shen & Lei Liu

  2. School of Material Science and Engineering, Tianjin University, Tianjin, 300072, China

    Wenbin Hu

  3. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai, 200240, China

    Lei Liu

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  1. Tong Zhou
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Correspondence to Lei Liu.

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Zhou, T., Ding, Y., Luo, Q. et al. The Effects of Sodium Tungstate on the Characteristics of Microarc Oxidation Coating on Ti6Al4V. J. of Materi Eng and Perform 27, 5489–5499 (2018). https://doi.org/10.1007/s11665-018-3613-2

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  • DOI: https://doi.org/10.1007/s11665-018-3613-2

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