采用动电位极化曲线、电化学阻抗谱、电偶电流监测及恒电位极化等电化学方法研究了温度和Cl-浓度对Grade-2 Ti在模拟高放废物处置环境中缝隙腐蚀行为的影响.结果表明,浸泡初期,带缝隙Ti电极在25-95℃时均呈现钝化特征.随浸泡时间延长,缝隙内介质环境侵蚀性增强,诱发Ti缝隙腐蚀.随着温度的升高和C1-浓度的增加,电偶电流增大,Ti的耐缝隙腐蚀性能下降.Ti缝隙腐蚀各阶段转变的临界温度随着C1-浓度和外加电位的增加而降低.由于发生阳极活性溶解,缝隙口处金属被严重破坏.
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