Improved Thermal Stability of Al-Si Alloy Coated Steel Sheet with Cr Thin Film Deposition

We investigated the effect of Cr thin film deposition on the thermal stability and corrosion resistance of hot-dip aluminized steel. A high-quality Cr thin film was deposited on the surface of the Al-9 wt.% Si-coated steel sheets by physical vapor deposition. When the Al-Si coated steel sheets were exposed to a high temperature of 500℃, Fe from the steel substrate diffused into the Al-Si coating layer resulting in discoloration. However, the highly heat-resistant Cr thin film deposited on the Al-Si coating prevented diffusion and surface exposure of Fe, improving the heat and corrosion resistances of the Al-Si alloy coated steel sheet.

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This work was supported by the [National Research Foundation of Korea (NRF)] grant funded by the Korea Government (Ministry of Science and ICT) [No. 2022R1A2C1008972]. This work was also supported by the Technology Innovation Program (20012941) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). This work was also supported in part by the Technology Development Program (00221849) funded by the Ministry of SMEs and Startups (MSS, Korea). This work was also supported in part by “Research base Construction Fund Support Program” funded by Jeonbuk National University in 2023.