Journal
CORROSION SCIENCE
Volume 183, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109339
Keywords
Hot-dip-aluminizing; Hot-press-forming; Al-Si-Mg coating; Electrochemical testing; UHSS
Funding
- HyundaiSteel Research and Development Center of the Republic of Korea
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The study focuses on the enhanced corrosion performance of Al-Si-Mg coated 22MnB5 boron steel after hot-dip-aluminizing and hot-press-forming processes. Structural changes in the coating, including a more compact surface with Mg segregation and a thicker crack-free layer, contribute to higher polarization resistance and improved anti-corrosion performance, making Al-Si-Mg coating a potential alternative for hot-press-forming steel.
This study introduces enhanced corrosion performance of the Al-Si-Mg coated 22MnB5 boron steel. Structural changes of the coating after hot-dip-aluminizing and hot-press-forming processes with the presence of Mg included compacter surface with Mg segregation and thicker crack-free layer. Electrochemical corrosion tests indicated higher polarization resistance from the Al-Si-Mg sample compared to the reference Al-Si sample, especially in an early period of immersion. Such enhanced anti-corrosion performance can be attributed to the aforementioned structural changes and pore-filling effect of corrosion products. This study depicts that the Al-SiMg coating can be considered as another option for hot-press-forming steel by its enhanced barrier protection vs. This study introduces enhanced corrosion performance of the Al-Si-Mg coated 22MnB5 boron steel. Structural changes of the coating after hot-dip-aluminizing and hot-press-forming processes with the presence of Mg included compacter surface with Mg segregation and thicker crack-free layer. Electrochemical corrosion tests indicated higher polarization resistance from the Al-Si-Mg sample compared to the reference Al-Si sample, especially in an early period of immersion. Such enhanced anti-corrosion performance can be attributed to the aforementioned structural changes and pore-filling effect of corrosion products. This study depicts that the Al-Si Mg coating can be considered as another option for hot-press-forming steel by its enhanced barrier protection vs. Al-Si coating.
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