Corrosion Behaviors of Pure Titanium and Its Weldment in Simulated Desulfurized Flue Gas Condensates in Thermal Power Plant Chimney
来源期刊：Acta Metallurgica Sinica2015年第4期
论文作者：Zheng-Bing Wang Hong-Xiang Hu Chun-Bo Liu Huai-Ning Chen Yu-Gui Zheng
文章页码：477 - 486
摘 要：The corrosion behaviors of pure titanium and its weldment welded by tungsten inert gas（TIG） welding in simulated desulfurized flue gas condensates in thermal power plant chimney were investigated using potentiodynamic polarization,electrochemical impedance spectroscopy（EIS） and immersion tests.The effects of heat input and shielding gases on the corrosion behavior of the welded titanium were also studied.Grain coarsening and Widmansta¨tten structure were found in both the fusion zone and the heat-affected zone.The welded titanium exhibited active–passive behavior in the simulated condensates.Both the polarization curves and EIS measurements confirmed that TIG welding process with different parameters had few effects on the corrosion behavior.It was proved that the microstructure changes were not the key material factors affecting the corrosion behavior of pure titanium under the test conditions,while the oxide film had remarkable effect on improving the corrosion resistance.
Zheng-Bing Wang1，Hong-Xiang Hu1，Chun-Bo Liu2，Huai-Ning Chen3，Yu-Gui Zheng1
1. Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences2. Center for Wear and Corrosion Resistant Materials,Huadian Zhengzhou Mechanical Design Institute Co.,Ltd.3. Laboratory of Properties and Reliable Joining of Welded Joints,Institute of Metal Research,Chinese Academy of Sciences
摘 要：The corrosion behaviors of pure titanium and its weldment welded by tungsten inert gas（TIG） welding in simulated desulfurized flue gas condensates in thermal power plant chimney were investigated using potentiodynamic polarization,electrochemical impedance spectroscopy（EIS） and immersion tests.The effects of heat input and shielding gases on the corrosion behavior of the welded titanium were also studied.Grain coarsening and Widmansta¨tten structure were found in both the fusion zone and the heat-affected zone.The welded titanium exhibited active–passive behavior in the simulated condensates.Both the polarization curves and EIS measurements confirmed that TIG welding process with different parameters had few effects on the corrosion behavior.It was proved that the microstructure changes were not the key material factors affecting the corrosion behavior of pure titanium under the test conditions,while the oxide film had remarkable effect on improving the corrosion resistance.
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