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ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Visualization of Water in Corroded Region of Painted Steels at a Compact Neutron Source
Atsushi Taketani , Masako Yamada, Yoshimasa Ikeda, Takao Hashiguchi, Hideyuki Sunaga, Yasuo Wakabayashi, Syoichi Ashigai, Masato Takamura, Shunsuke Mihara, Shinzo Yanagimachi, Yoshie Otake, Takumi Wakabayashi, Kenji Kono, Takenori Nakayama
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Keywords: compact neutron source, neutron imaging, water distribution, painted steels, under-film corrosion, corrosion-resistant alloy, normal steel
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2017 Volume 57 Issue 1 Pages 155-161

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Abstract

Water under a film of paint in corroded steels was visualized using thermal neutrons at the RIKEN-accelerator-based compact neutron source. Two painted plate samples made of normal steel and corrosion-resistant alloy steel were prepared. Both were scratched on the painted surface and then subjected to a cyclic corrosion test to generate blisters caused by under-film corrosion. They were soaked in water for 2 h and then removed from the water. Time dependences of the water distribution in the under-film corrosion were observed using the neutron transmission imaging method for the first time. The alloy sample contained less water than the sample made of normal steel and the water in the alloy escaped from the sample more rapidly than that in the normal steel. We also evaluate the corrosion resistance performance of the painted steel sample.

Time dependence of the water distributions. The colors indicate the estimated water thickness at each pixel. Fullsize Image
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© 2017 by The Iron and Steel Institute of Japan
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