Abstract
An acoustic emission (AE) monitoring for pitting corrosion on SUS304 steel was performed for discussing the source of AE signals and feasibility of AE method to detection of pitting corrosion. AE monitoring was performed for a thin SUS304 plate in 3% NaCl aqueous solution adjusted pH to 2 to 6 during cathodic and anodic polarizing. In cathodic polarization process, much AE due to hydrogen gas evaluation was detected and its frequency was kept in the range of 200 kHz to 300 kHz. Its amplitude depended on size of the bubble. In anodic process, AE was detected on only five times out of 27 measures. In three times out of those cases, growth, migration or departure of hydrogen bubbles were observed at the same timing of AE detection. The source of AE signal may be those bubble's behaviors. However, the number of AE signals was limited even when the bubbles were observed and no AE was observed without the bubbles. Additionally, No AE was detected even when an oxide film cap on a pitting hole appeared although it is reported that the cap breakage was one of AE sources in pitting corrosion. The amplitude of AE due to pitting corrosion might be very small and detecting the AE might be difficult with conventional AE monitoring equipment.
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