高Mo含量钛合金的真空制备及耐蚀性能研究

Research on Vacuum Preparation and Corrosion Resistance of Titanium Alloys with High Mo Content

针对Ti-Mo合金在真空制备时易出现Mo元素偏析、Mo金属夹杂及合金成分难于控制等问题,采用真空电弧自耗熔炼技术,从电极制备、电弧放电参数及熔炼次数等方面进行控制,制备出高Mo含量钛合金工业级铸锭,并研究了其耐腐蚀性能。结果表明:所制备Ti-Mo合金铸锭气体元素O含量不高于0.05%、H含量不高于0.001%、N含量不高于0.008%,Mo含量偏差小于0.9%;在室温H2SO4和HCl溶液中,Ti32Mo合金几乎不发生腐蚀反应;在75℃条件下,HCl溶液中Ti32Mo合金最大腐蚀速率不超过0.024mm/a,H2SO4中的最大腐蚀速率不超过0.067mm/a。

In view of the problems that Mo segregation,Mo inclusion and alloy composition are difficult to control when preparing Ti-Mo alloy in vacuum,vacuum arc consumable melting technology is adopted to control the electrode preparation,arc discharge parameters and melting times.The industrial grade ingot of high Mo content titanium alloy Ti32Mo was prepared.The gas element O content is not higher than 0.05%,H content is not higher than 0.001%,N content is not higher than 0.008%,and the deviation of Mo is less than 0.9%.The Ti32Mo alloy hardly corrodes in H2SO4 and HCl solution at room temperature.At 75℃,the maximum corrosion rate in HCl solution is less than 0.024mm/a,and that in H2SO4 is less than 0.067mm/a.