Structure and Corrosion-resistance Properties of Ru/Ti Thin Films on Pure Titanium Surface via Hybrid Surface Nanocrystallization
YU Dengde1, ZHANG Renyao2, SHEN Yue2, WEN Ming2, LIU Hongxi1
1 School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China 2 State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China
Abstract: Titanium and titanium alloys have the advantages of high specific strength, good machinability, resistance to shock and vibration, seawater and marine atmospheric corrosion-resistance, etc., making them as excellent marine metal structural materials. However, under aggressive high-concentration chloride and fluoride ions working condition, titanium and titanium alloys are liable to accelerate corrosion. In addition, when titanium and titanium alloys with high corrosion potential are in contact with other metals with low corrosion potential such as copper and iron galvanic corrosion will occur, which will easily cause corrosion of other metals. At present, various surface treatment methods can be used to improve the surface corrosion resistance of titanium and titanium alloys in order to expand their scope of application. However, the previous studies on the surface modification of titanium and titanium alloys mainly focused on the influence of a single surface treatment method on the corrosion performance. There are a few researches on the corrosion resistance of titanium and titanium alloys under a hybrid surface treatment method. The Ru/Ti films on the surface of industrial pure titanium (TA2) was prepared by surface mechanical polishing (SMAT), magnetron sputtering and thermal oxidation treatment, and to study their corrosion properties in simulated seawater. The X-ray diffractometer (XRD), field emission scanning electron microscope (FE-SEM), and electrochemical workstation were used to study the phase composition, surface morphologies, and corrosion resistance of the films. The results showed that the Ru / Ti film obtained on the surface of industrial pure titanium was uniform and dense without obvious defects. The Ti in the Ru / Ti film exhibited an α-Ti and fcc-Ti dual-phase structure. The corrosion resistance of thin film of indust-rial pure titanium in simulated seawater was significantly improved.
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2020, Vol. 34 
