钛及钛合金多弧离子镀Ta-10W涂层的腐蚀性能

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Abstract To improve the corrosion performance of titanium and titanium alloy in human body and Marine environment,the Ta-10W coating was prepared on the commercial pure titanium (CP-Ti) and TC4 matrix by multi-arc ion plating. The corrosion resistance of the coating in simulated human body and Marine environment was studied by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), electrodynamic polarization and electrochemical impedance spectroscopy (EIS) test. The results show that the Ta-10W coating is continuous, dense with uniform thickness. The mainly phase is body-centered cubic α-Ta. Ta-10W coated samples corrosion potential is higher and corrosion current density is lower in ringer solution and simulated seawater solution. The Ta-10W coating on CP-Ti reduces the corrosion current density to 2.648×10^-9A/cm² in ringer solution and 2.548×10^-9 A/cm² in simulated seawater solution, which is an order of magnitude lower than that of CP-Ti matrix, and also has excellent improvements on TC4 matrix. In addition, Ta-10W increases the charge transfer resistance of CP-Ti and TC4 by 1 or 2 orders of magnitude in the two solutions. The dielectric property of the double layer is also improved by coating Ta-10W, thus the corrosion resistance of CP-Ti and TC4 in different solution environments is effectively improved. Therefore, Ta-10W coating has a good protective effect on the corrosion resistance of CP-Ti and TC4 in human body and marine environment, and is instructive for the application of titanium and titanium alloy in these environments.

Key words： surface engineering tantalum alloy coating titanium alloy multi-arc ion plating electrochemical corrosion

Received: 25 March 2019 Published: 14 November 2019

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	SUN Pei
	GU Yi
	LI Yaqi
	LIU Baoshan

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SUN Pei,GU Yi,LI Yaqi, et al. Corrosion performance of Ta-10W coating on titanium and its alloy by multi-arc ion plating[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(5): 413-421.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I5/413

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