Observation of actual pitting corrosions by photoacoustic imaging

Yoichiro Hiwatashi; Haruo Endoh; Tsutomu Hoshimiya

doi:10.1117/12.347747

7 May 1999 Observation of actual pitting corrosions by photoacoustic imaging

Yoichiro Hiwatashi, Haruo Endoh, Tsutomu Hoshimiya

Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999) https://doi.org/10.1117/12.347747
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan

Abstract

In this study, imaging of the actual pitting corrosions by photoacoustic microscope (PAM) has been demonstrated for the first time. Two types of the actual pitting corrosions are generated by immersion and electrochemical method. Immersion tests are conducted in sodium chloride aqueous solutions for pure aluminum plate. Electrochemical method are conducted by electrolysis under the continuous electrode with potentiostatt in sodium chloride aqueous solutions for pure aluminum plate. Nondestructive measurement of pitting corrosions was carried out with PAM and simultaneous measurement of amplitude and phase of the photoacoustic (PA) signal at every point of scanning is carried out, and the PA amplitude and phase images are obtained. The PA amplitude signal intensity changed with both shape and depth of a pitting corrosions. Phase signal intensity relatively reflected the depth and cross section of a pitting corrosion. Furthermore, comparing of the imaging of the actual pitting corrosions and the simulated pitting made by chemical etching.

Citation Download Citation

Yoichiro Hiwatashi, Haruo Endoh, and Tsutomu Hoshimiya "Observation of actual pitting corrosions by photoacoustic imaging", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); https://doi.org/10.1117/12.347747

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