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首页> 外文会议>Proceedings vol.2004-14; Electrochemical Society(ECS) International Meeting and Symposium on Corrosion in Marine and Saltwater Environments II; 20041003-08; Honolulu,HI(US) >THE MECHANISM OF CHLORIDE-INDUCED FILIFORM CORROSION ON IRON INVESTIGATED BY TIME-LAPSE PHOTOMICROGRAPHY
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THE MECHANISM OF CHLORIDE-INDUCED FILIFORM CORROSION ON IRON INVESTIGATED BY TIME-LAPSE PHOTOMICROGRAPHY

机译：延时摄影技术研究氯化物对铁的丝状腐蚀机理

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Time lapse photography is used to study filiform corrosion (FFC) on iron. FFC is initiated by applying aqueous NaCl onto an artificial defect, subsequently images of the FFC are obtained by repeated in situ microscope photography. An experiment was setup to allow the variation of atmospheres between the head and tail of a filament. When both the head and tail of a FFC filament were exposed to an air atmosphere, it is observed that its advance over time is saltatory. Under these conditions a thin ring of corrosion products is formed at the leading edge of the head, appearing to inhibit smooth progression. However, when the head is exposed to an argon atmosphere the ring at the front disappears and the advancement continues smoothly with increasing filament width until air is added to the system again. The ring does not affect the propagation rate of FFC filament but does govern the dimensionality and thus disbonded area. This paper gives a new insight into the established theory that the principle cathode in FFC on iron is at the back of the filament head.
机译：缩时摄影用于研究铁上的丝状腐蚀（FFC）。通过将NaCl水溶液施加到人工缺陷上来启动FFC，随后通过重复进行原位显微镜摄影获得FFC的图像。设置了一个实验，以允许灯丝的头和尾之间的气氛变化。当FFC灯丝的头和尾都暴露在空气中时，可以观察到其随时间的前进是咸的。在这种情况下，在头部的前缘会形成一层薄薄的腐蚀产物环，似乎会抑制光滑进程。但是，当喷头暴露于氩气环境中时，前端的环消失了，并且随着细丝宽度的增加，行进继续平稳进行，直到再次向系统中添加了空气。该环不影响FFC细丝的传播速率，但可以控制尺寸并因此控制剥离面积。本文对已建立的理论提供了新的见解：FFC上铁的主要阴极位于灯丝头的背面。

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