Development of Rapid Evaluation Method for Metal Corrosion by Random Potential Pulse
Daisuke SHINTANI, Toshio ISHIDA, Yasuyuki TAKATANI@and Yosohiro SUGIE
Abstract:Localized corrosion damages from pitting or crevice corrosion attacks frequently appear on stainless steel structure, notably on the equipment for chemical plant. It is known the initiation process of localized corrosion produces current noise. This behavior is generated by the breakdown and repassivation of passive film on an electrode, the analysis of the current noise would be important signals for monitoring the initiation of localized corrosion. We have been developing an analysis for current noise using Random Pulse method1). This paper presents the experimental results that show the analysis we have development has a capability to identify the corrosion phenomena of the electrode. Furthermore, we found the waveform of the current changes responding to the applied potential pulse gives the data characteristic of corrosion on an electrode. Key Words:Current noise, Localized corrosion, Random Pulse method, Waveform