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首页> 外文期刊>Journal of Materials Engineering and Performance >Crevice Corrosion of Titanium in High Temperature-Concentrated Chloride Environments
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Crevice Corrosion of Titanium in High Temperature-Concentrated Chloride Environments

机译：高温氯化物环境下钛的缝隙腐蚀

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摘要

Crevice corrosion of titanium is activated in concentrated chloride media at 100 deg C. This was possible only with the tightest gap (0.005 cm) between Ti-Ti surfaces. No crevice corrosion was observed with greater gap dimensions. The design of the crevice led to the occurrence of two concentric circular rings of corroded areas, with many pits on them. After potentiostating in the passive region for 5 h in 25 percent NaCl (pH velence 4.7)-where hydrogen evolution is thermodynamically prohibited-hydrogen gas bubbles were observed to egress out of the crevice mouth during ongoing crevice corrosion. This indicates that hydrogen evolution occurs within the crevice. The results are compatible with the occurrence of gradually increasing ohmic potential shift and localized acidification in the crevice electrolyte as judged by the measured gradual increase of the crevice corrosion current. The high acidity of the bulk electrolyte does not seem to be sufficient or even a necessary condition for crevice corrosion to occur.
机译：钛的缝隙腐蚀在100℃的浓氯化物介质中被激活。只有在Ti-Ti表面之间的间隙最窄（0.005 cm）的情况下，才可能发生钛腐蚀。间隙尺寸较大时，未观察到缝隙腐蚀。缝隙的设计导致出现两个同心圆环腐蚀区域，上面有许多凹坑。在25％NaCl（pH velence 4.7）中在被动区中增强电位5小时后，在该处氢在热力学上被禁止-在正在进行的缝隙腐蚀期间观察到氢气气泡从缝隙口中逸出。这表明在缝隙中发生了氢气逸出。该结果与通过测量的缝隙腐蚀电流的逐渐增加所判断的在缝隙电解质中逐渐增加的欧姆电势偏移和局部酸化的发生是相容的。本体电解质的高酸度似乎不足以甚至不能发生缝隙腐蚀。

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