化学成分及金相组织对纯钛自腐蚀电位的影响

Effects of Chemical Composition and Microstructure on the Free Corrosion Potential of Pure Titanium

分析了采用自动焊及手工焊两种方式焊接的TA2纯钛板焊缝及母材的化学成分、金相组织及其在海水介质中的自腐蚀电位。结果表明:自动焊焊缝试样、手工焊焊缝试样和母材试样的自腐蚀电位相差不大。母材试样与焊缝试样的气体元素(C,N)含量有较大差异;母材试样的金相组织为单相等轴α组织,而焊缝试样的金相组织为粗大锯齿状α相+少量针状马氏体组织;化学成分和金相组织对3种试样在海水中自腐蚀电位的影响不大。

Chemical composition, microstructure and corrosion potential in seawater of the base metal and two kinds of TA2 titanium plate prepared by automatic welding and manual welding were analyzed. The results showed that the free corrosion potentials of automatic welding seam sample, manual welding seam sample and base metal sample had a little difference. The content of gas elements （C, N） of base metal sample and weld metal sample were different. The microstructure of base metal is a single equiaxed α phase, while the weld is a thick, serrated a phase and a small amount of needle martensite. The effects of chemical composition and microstrueture on self corrosion potential of 3 samples in seawater are little.