4.7 Article

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

Journal

CORROSION SCIENCE
Volume 221, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2023.111358

Keywords

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

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This study added Sb to modulate the diffusion rates of Fe and Al/Si, resulting in the formation of H-trapping voids within the coating. These voids provided pathways for the release of H atoms, 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.
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.

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