ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Special Issue on "Toward Suppression of Hydrogen Absorption and Hydrogen Embrittlement for Steels"
Hydrogen Permeation Behavior of Scratch on Zn Coated Steel during 1000 Hours Wet and Dry Corrosion Test
Kei Sakata , Masatoshi Sakairi, Junichiro Kinugasa
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Keywords: electrochemical permeated hydrogen detection, Zn coated steel, scratch, laser fabrication, simulated atmospheric corrosion environment
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2021 Volume 61 Issue 4 Pages 1127-1134

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Abstract

In this study, hydrogen permeation current from scratch formed on Zn coated steel during 1000 h wet and dry cyclic corrosion test was investigated. The scratch was fabricated by focused pulsed Nd: YAG laser irradiation. The obtained hydrogen permeation current has peaks during wetting, and the peak currents decrease with time. Formation of Zn corrosion products prevent hydrogen entry. After the test, there are Zn oxide (ZnO) on the substrate steel, hydrozincite (Zn5(OH)6(CO3)2) around the scratch boundary and simonkolleite (Zn5(OH)8Cl2) on Zn coated region. It is suggested that pH change with distance from the formed scratch is the reason for the composition of Zn corrosion products change with location.

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© 2021 The Iron and Steel Institute of Japan.

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