Improvement of hydrogen embrittlement by void formation at coating layers of Sb-added Al-Si-coated hot-press-forming steels

Selim Kim, Sang Yoon Song, Sang Heon Kim, Seongwoo Kim, Jinkeun Oh, Byeong Joo Lee, Sunghak Lee, Nack J. Kim, Alireza Zargaran, Seok Su Sohn

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Al-Si coating prevents the oxidation or decarburization of hot-press forming (HPF) steel. However, the high reactivity of Al with moisture promotes H uptake, and the coating hinders the out-diffusion of absorbed H atoms inside the steel, leading to hydrogen embrittlement (HE). This study added Sb to adjust Fe and Al/Si diffusivity, and forming H-trapping voids within the coating. Simultanesouly, these voids provided routes for the emission of H atoms, thereby improving the resistance to crack propagation during bending. The optimal design of the Al-Si coating by adjusting the Sb content and void fraction would enable extensive applications of HPF steel.

Original languageEnglish
Article number111358
JournalCorrosion Science
Volume221
DOIs
Publication statusPublished - 2023 Aug 15

Bibliographical note

Funding Information:
This work was supported by the POSCO Technical Research Laboratories; the Korea University Grant for S.S. Sohn; the Brain Korea 21 FOUR Project for Education and Research Center for Future Materials ( F20YY7105002 ); the Fundamental Research Project of the National Research Foundation of Korea (NRF- 2019R1F1A1057687 ); the Korea Institute for Advancement of Technology ( KIAT ) grant funded by the Korea Government ( MOTIE ) ( P0002019 , The Competency Development Program for Industry Specialist); Samsung Research Funding & Incubation Center of Samsung Electronics ( SRFC-MA1902-04 ); and the Fundamental Research Program of the Korean Institute of Materials Science ( PNK8730 ); This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government (MSIT) [ NRF - 2022R1A5A1030054 ; NRF- 2023M3H4A6A01058096 ].

Publisher Copyright:
© 2023 Elsevier Ltd

Keywords

  • Al-Si coating
  • Hot-press-forming (HPF) steel
  • Hydrogen embrittlement (HE)
  • Intrusion and emission of H atoms
  • Sb addition
  • Sb-enriched zone

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science

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