Corrosion resistance and antibacterial activity of different zones in TA2 weldment by TIG welding
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Rare Met. DOI 10.1007/s12598-014-0395-z
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Corrosion resistance and antibacterial activity of different zones in TA2 weldment by TIG welding Yan-Ping Zhu, Chang-Yi Li, Lian-Yun Zhang*
Received: 18 October 2013 / Revised: 16 January 2014 / Accepted: 4 September 2014 Ó The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2014
Abstract The corrosion resistance behavior of TA2 pure titanium processed by tungsten inert gas (TIG) welding was investigated in artificial saliva solution at 37 °C. By metallographic examination, electrochemical measurement technology, and electrochemical impedance spectroscopy (EIS), the corrosion resistance of the base metal (BM), heat-affected zone (HAZ), and weld metal (WM) were investigated. Metallographic examination experiments show that welding process would cause the growth of grain size. In addition, phase change happens in the HAZ and WM. The change of grain size and phase would influence the generation of the original passive film. The electrochemical tests show that the BM, HAZ, and WM are all equipped with good corrosion resistance. The welded joint shows a better corrosion resistance than the original TA2. It is shown that the BM with the lowest corrosion potential and the biggest corrosion current has a worse corrosion resistance than WM as well as HAZ. Silver (Ag) nanoparticles can be distributed on the WM zone of Ti uniformly. The WM zone of Ti with Ag coating considerably enhances the antibacterial activity of Ti implants. Keywords Titanium; Tungsten inert gas welding; Corrosion resistance; Artificial saliva solution; Antibacterial activity
Y.-P. Zhu Department of Prosthodontics, Tianjin Stomatological Hospital, Tianjin 300041, China Y.-P. Zhu, C.-Y. Li, L.-Y. Zhang* School of Stomatology, Tianjin Medical University, Tianjin 300070, China e-mail: [email protected]
1 Introduction Titanium and its alloy are extensively used in dental application owing to their low density, excellent biocompatibility, corrosion resistance, high strength-to-weight ratio, and relatively low thermal conductivity [1–3]. Grade 2 commercial pure titanium, known as TA2 pure titanium, is one of the most commonly used titanium alloy. TA2 pure titanium is a typical a-type titanium alloy with a close-packed hexagonal structure [4]. Because TiO2 can easily form on the surface of TA2 pure titanium, it possesses good corrosion resistance. Hence, it can improve the corrosion resistance in most cases [5]. The joining of a metal framework is frequently necessary for dental prostheses to achieve efficient treatment procedures. Laser welding is the conventional method of joining titanium metals in different clinical settings. However, welding quality varies greatly due to the different radiation intensities used. Tungsten inert gas (TIG) welding demanding less expensive equipment is carried out under an argon environment and is extensively used in Ti industrial production; its corrosion resistance is one of the important properties of this welding syste
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