Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effects of Zn-Flash Coating on Hydrogen Evolution, Infusion, and Embrittlement of Advanced-High-Strength Steel During Electro-Galvanizing

Zn-Flash 코팅 처리가 전기아연도금 시 초고강도 강재의 수소 발생, 유입 및 취화 거동에 미치는 영향

  • Hye Rin Bang (Department of Advanced Materials Science and Engineering, Sunchon National University) ;
  • Sang Heon Kim (M.E.C. Co. LTD. Technical Research Laboratories) ;
  • Sung Jin Kim (Department of Advanced Materials Science and Engineering, Sunchon National University)
  • Received : 2023.08.25
  • Accepted : 2023.09.15
  • Published : 2023.10.30
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Abstract

In the present study, effects of a thin Zn-flash coating on hydrogen evolution, infusion, and embrittlement of advanced high strength steel during electro-galvanizing were examined. The electrochemical permeation technique in conjunction with impedance spectroscopy was employed under applied cathodic polarization. Moreover, a slow-strain rate test was conducted to evaluate loss of elongation (i.e., indicative of hydrogen embrittlement (HE)) and examine fracture surfaces. Results showed that the presence of a thin Zn-flash coating, even when it was not distributed uniformly, reduced hydrogen evolution rate and substantially impeded infusion of hydrogen into the steel substrate. This was primarily due to a hydrogen overvoltage on Zn coating and trapping of hydrogen at the interface of Zn coating/flash coating/steel substrate. Consequently, the sample with flash coating had a smaller HE index than the sample without flash coating. These results suggest that a thin Zn-flash coating could be an effective technical strategy for mitigating HE in advanced high-strength steels.

Keywords

Acknowledgement

This result was supported by "Regional Innovation Strategy (RIS)" through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE) (2021RIS-002). Also, this research was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2022R1A2C4001255).

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