温度对溴化锂溶液中Ti-6Al-4V初期空蚀行为的影响

发布时间：2018-01-20 03:24

  本文关键词： Ti-Al-V合金 溴化锂溶液 温度 空蚀 影响机理　出处：《中国有色金属学报》2017年07期 　论文类型：期刊论文

【摘要】：采用三维视频显微镜、粗糙度轮廓仪和电化学测试研究溴化锂溶液中不同温度条件下Ti-6Al-4V微观空蚀形貌、粗糙度以及电化学腐蚀行为,探讨温度对空蚀的影响机理。结果表明:温度的影响随空蚀时间增加不断加强,240 min时最为显著,之后影响减弱并趋于稳定。温度升高,空泡溃灭产生的微射流冲击强度增大,使表面钝化膜更易被破坏,同时腐蚀作用加速了点蚀形成,导致表面局部应力集中和更多电化学电池的产生,从而促进了力学和腐蚀因素,两者的协同作用加速了空蚀破坏。空蚀破坏程度在温度55℃时达到最大值,继续升高温度,腐蚀因素仍被促进,但微射流对表面的冲击强度减弱,对表面钝化膜的破坏作用降低,由于力学因素在空蚀中占据主导地位,因此使空蚀速率得到减缓。
[Abstract]:The micro-cavitation morphology, roughness and electrochemical corrosion behavior of Ti-6Al-4V at different temperatures in lithium bromide solution were investigated by three-dimensional video microscope, roughness profiler and electrochemical measurement. The effect of temperature on cavitation erosion is discussed. The results show that the effect of temperature on cavitation corrosion is the most obvious with the increase of cavitation time, and then decreases and tends to be stable. The impact strength of micro jet caused by bubble collapse increases, which makes the surface passivation film more easily destroyed. At the same time, corrosion accelerates the formation of pitting, resulting in local stress concentration on the surface and the production of more electrochemical cells. Thus the mechanical and corrosion factors are promoted, and the synergistic effect of the two factors accelerates the cavitation damage. The cavitation damage degree reaches the maximum at 55 鈩，

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