静水压力和阴极极化对钛合金应力腐蚀敏感性的影响  

Effects of Hydrostatic Pressure and Cathodic Polarization on Stress Corrosion of Titanium Alloy in Seawater

作　　者：孙吉宏 毛柳伟 赵铭钰 宋卿源 杜度 SUN Jihong;MAO Liuwei;ZHAO Mingyu;SONG Qingyuan;DU Du(No.92578 Army of the People′s Liberation Army of China,Beijing 100071,China;Science and Technology on Marine Corrosion and Protection Laboratory,Luoyang Ship Material Research Institute,Qingdao 266237,China)

机构地区：[1]中国人民解放军92578部队,北京100071 [2]中国船舶重工集团公司第七二五研究所海洋腐蚀与防护重点实验室,山东青岛266237

出　　处：《材料开发与应用》2022年第1期12-16,20,共6页Development and Application of Materials

摘　　要：采用电化学极化实验、慢应变速率拉伸实验、断口形貌观察和恒变形应力腐蚀裂纹扩展实验的方法,研究静水压力和阴极极化对Ti75合金海水应力腐蚀的影响。结果表明:静水压力对Ti75合金的应力腐蚀敏感性没有明显影响。在阴极极化情况下,Ti75合金的应力腐蚀临界应力强度因子(K_(ISCC))下降,其应力腐蚀敏感性随着电位的负移而提高,-0.77 V为氢致应力腐蚀发生的临界电位。The effects of hydrostatic pressure and cathodic polarization on stress corrosion of Ti75 alloy are studied by electrochemical polarization test,slow rate test(SSRT),fracture morphology observation and constant deformation stress corrosion test.Results show that hydrostatic pressure has no obvious effect on stress corrosion sensitivity of Ti75 alloy.Under the circumstance of cathodic polarization,the critical stress intensity factor of stress corrosion(K_(ISCC))of Ti75 alloy decreases,and the stress corrosion sensitivity increases with the negative shift of the potential.The critical cathodic polarization potential of hydrogen induced stress corrosion is-0.77 V.

关 键 词：Ti75 应力腐蚀 静水压力 阴极极化 

分 类 号：TG146.2[一般工业技术—材料科学与工程]