中国激光, 2016, 43 (4): 0403004, 网络出版: 2016-04-05   

激光增材制造TC11 钛合金的耐蚀性研究

Corrosion Resistance Research of Laser Additive Manufactured TC11 Titanium Alloy
何博文 1,2,3,*冉先喆 1,2,3田象军 1,2,3王华明 1,2,3
作者单位
1 北京航空航天大学大型金属构件增材制造国家工程实验室, 北京 100191
2 国防科技工业激光增材制造技术研究应用中心, 北京 100191
3 大型整体金属构件激光直接制造教育部工程研究中心, 北京 100191
摘要
采用浸泡和电化学腐蚀测试方法,研究了激光增材制造TC11 钛合金在盐酸溶液中的耐蚀性,利用扫描电镜分析了腐蚀前后合金表面的微观形貌。结果表明:激光增材制造TC11钛合金中α相所含Mo元素较少,易于发生选择性优先溶解;在盐酸溶液中,随浸泡时间的延长,开路电位先降低后逐步升高,电荷转移电阻Rct先急剧下降后逐渐保持稳定,自腐蚀电流密度icorr升高;激光增材制造TC11 钛合金α+β网篮组织较锻件双态组织细小,具有更好的耐蚀性;双重退火热处理后,α相含量增多并粗化,耐蚀性略有下降。
Abstract
The corrosion resistance of laser additive manufactured (LAM) TC11 titanium alloy is studied in hydrochloric acidic solution with immersion and electrochemical corrosion test methods. Surface morphologies are analyzed by scanning electron microscope. The results indicate that α phase of laser additive manufactured TC11 titanium alloy contains low-content Mo element, and easily selective dissolves preferentially. In hydrochloric acidic solution, with the extending corrosion time, the open circuit potential first decreases and then increases gradually, and the charge transfer resistance Rct sharply decreases before maintaining stability. Self-corrosion current density icorr increases with the increase of the corrosion time. The α+ β basket- weave microstructure of laser additive manufactured TC11 titanium alloy possesses finer α phase than that of bimodal microstructure of forged alloy, and exhibits better corrosion resistance. Microstructure of the heat-treated specimen contains higher volume fraction and coarsening α-phase, but a slight decrease in the corrosion resistance.

何博文, 冉先喆, 田象军, 王华明. 激光增材制造TC11 钛合金的耐蚀性研究[J]. 中国激光, 2016, 43(4): 0403004. He Bowen, Ran Xianzhe, Tian Xiangjun, Wang Huaming. Corrosion Resistance Research of Laser Additive Manufactured TC11 Titanium Alloy[J]. Chinese Journal of Lasers, 2016, 43(4): 0403004.

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