中文摘要：

纯钛和它的焊接的腐蚀行为由钨焊接了尽最大努力在模仿的 desulfurized 烟道气体冷凝物焊接的惰性的气体(TIG ) 植物烟囱用 potentiodynamic 极化，电气化学的阻抗光谱学(EIS ) 和沉浸被调查测试。焊接的钛的腐蚀行为上的热输入和防护气体的效果也被学习。谷物变粗和 Widmanst ? tten 结构在熔化地区和影响热的地区被发现。焊接的钛在模仿的冷凝物展出了 activepassive 行为。极化曲线和 EIS 大小证实与不同参数焊接过程的 TIG 在腐蚀行为上有很少效果。微观结构变化不是在测试条件下面影响纯钛的腐蚀行为的关键材料因素，这被证明，当氧化物电影在改进腐蚀抵抗上有显著效果时。

英文摘要：

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 Widmanst~itten 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.