论文部分内容阅读
利用循环伏安法(CV)和楔型加载WOL预裂纹试样法,结合扫描电镜(SEM)研究了TC4,TC18和TC213种钛合金在3.5%NaCl溶液中的腐蚀行为。结果表明:3种钛合金的点蚀击破电位Eb分别是1.625,1.671和1.871V,均较高,耐点蚀性能均较优异,点蚀敏感性依次为:TC4>TC18>TC21。3种钛合金的应力腐蚀临界应力场强度因子KISCC分别为62.92,66.82和71.99MPa·m0.5,应力腐蚀敏感性依次为:TC4>TC18>TC21。从3种钛合金应力腐蚀宏观形貌可明显观察到预制裂纹区、腐蚀开裂区和机械断裂区的三层结构。其中,应力腐蚀开裂区以韧性断裂为主。
The corrosion behavior of TC4, TC18 and TC213 titanium alloys in 3.5% NaCl solution was studied by cyclic voltammetry (CV) and wedge pre-crack WOL loading and scanning electron microscopy (SEM). The results show that the pitting corrosion potential Eb of the three kinds of titanium alloys are 1.625, 1.671 and 1.871 V, respectively, which are high and have good pitting corrosion resistance. The pitting sensitivity of the three titanium alloys is as follows: TC4> TC18> TC21.3 titanium The stress corrosion critical stress field strength factor KISCC were 62.92,66.82 and 71.99MPa · m0.5, the sensitivity of stress corrosion corrosion as follows: TC4> TC18> TC21. From the three kinds of titanium alloy stress corrosion macroscopic morphology can be clearly observed prefabricated crack zone, corrosion cracking zone and mechanical fracture zone three-layer structure. Among them, the stress corrosion cracking zone is dominated by ductile fracture.