Limitations of Potentiostatic Repassivation Techniques and Their Relationship to the Applicability of the High Field Approximation to the Repassivation of Titanium
Limitations of Potentiostatic Repassivation Techniques and Their Relationship to the Applicability of the High Field Approximation to the Repassivation of Titanium
复制标题
恒电位再钝化技术的局限性及其与高场近似对钛再钝化的适用性的关系
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. Scully
中科院分区：
文献类型：
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作者：
D. Kolman;J. Scully
裸露表面和氧化物再钝化动力学对于理解钛的环境裂纹至关重要。先前的研究人员已使用各种恒电位再钝化技术来获取此信息。然而，表观再钝化动力学是去钝化速度、溶液电阻、恒电位仪响应等的函数。检查了这些限制中的每一个对再钝化行为的影响。还讨论了高场近似在氯化物溶液中钛的恒电位再钝化测试中的适用性。上述实验限制，以及总测量电流（其中 90% 是由于阳极溶解）和氧化物形成电流之间的显着差异，使得氧化物生长的高场近似成为在钛上观察到的电流衰减的无效模型，并解释了文献中报道的这种材料的大范围高场参数。
Bare surface and oxide repassivation kinetics are critical to the understanding of environmental cracking of titanium. Various potentiostatic repassivation techniques have been used by previous researchers to obtain this information. However, the apparent repassivation kinetics are a function of depassivation speed, solution resistance, potentiostat response, etc. The effect of each of these limitations on repassivation behavior is examined. The applicability of the high field approximation to potentiostatic repassivation tests on titanium in chloride solutions is also discussed. The above experimental limitations, as well as a significant difference between the total measured current (90% of which is due to anodic dissolution) and the oxide formation current, render the high field approximation to oxide growth an ineffective model of the current decay observed on titanium and explains the wide range of high field parameters that have been reported in the literature for this material.