Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of Ni-Flash Coating on Hydrogen Embrittlement and Liquid Metal Embrittlement of Ultra-High-Strength Electrogalvanized Steel Sheet

Ni-Flash 코팅이 초고강도 전기아연 도금강재의 수소취화 및 액상금속취화에 미치는 영향

  • Seon Ho Oh (Department of Advanced Materials Science and Engineering, Sunchon National University) ;
  • Jin Sung Park (Department of Advanced Materials Science and Engineering, Sunchon National University) ;
  • Sung Jin Kim (Department of Advanced Materials Science and Engineering, Sunchon National University)
  • 오선호 (순천대학교 첨단신소재공학과) ;
  • 박진성 (순천대학교 첨단신소재공학과) ;
  • 김성진 (순천대학교 첨단신소재공학과)
  • Received : 2024.06.27
  • Accepted : 2024.07.18
  • Published : 2024.08.30
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Abstract

The purpose of this study was to elucidate effects of a thin (tens to hundreds of nanometers) Ni-flash coating layer on hydrogen embrittlement (HE) and liquid metal embrittlement (LME) in ultra-high-strength electrogalvanized steel with a tensile strength of more than 1 GPa. Various experimental and analytical methods, including thermal desorption spectroscopy, slow strain rate testing, resistance spot welding, X-ray diffraction, and metallographic observation, were employed. Results showed that an increase in Ni target amount for flash coating resulted in a decrease in diffusible hydrogen content during electrogalvanizing, resulting in a significant decrease in HE sensitivity. Moreover, a Ni target amount of more than 1000 mg/m2 drastically reduced the occurring frequency and average depth of LME. This reduction could be primarily attributed to formation of Zn-Ni intermetallic phases during the welding process that could inhibit liquefaction of intermetallic phases in the heat-affected zone. This study provides a desirable Ni target amount for Ni-flash coating on ultra-high-strength steels conducted in a continuous galvanizing line or a high-speed batch line to achieve high resistance to both HE and LME.

Keywords

Acknowledgement

This work was supported by "Regional Innovation Strategy (RIS)" through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE) (2021RIS-002). This research was also supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2022R1A2C4001255). This research was also supported in part by the Technology Innovation Program (20016850, Development of surface blackening technology for high corrosion resistance galvanized alloy coating; 20015158, Development of processing and fastening technology to minimize damage to the plating layer of highly corrosion-resistant, highly-formed plated steel materials for plant farms) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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