Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Innovative Development of Al-Zn-Si Coated Sheet Steels for Automotive Applications

  • Jong-Sang Kim (Graduate Institute of Ferrous & Eco Materials Technology, POSTECH) ;
  • Suk-Kyu Lee (Surface Research Group, POSCO Technical Research Lab.) ;
  • Doo-Jin Paik (Surface Research Group, POSCO Technical Research Lab.)
  • Received : 2024.01.29
  • Accepted : 2024.08.14
  • Published : 2024.08.30
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Abstract

Steels have excellent mechanical properties and weldability. They are also economically producible. Thus, they are widely applied in various industries. However, they have a disadvantage in that rust can occur after a certain period of time. To compensate for this, Zn, which has excellent sacrificial corrosion resistance, can be coated on steels. With global zinc consumption increasing at the current rate, depletion is expected in the near future. Recently, POSCO has developed innovative Al-Zn-Si alloy coated steel sheets with better corrosion resistance than Zn coating. In this study, corrosion resistance, weldability, friction characteristics, and so on were evaluated compared to GI steel sheets to evaluate their applicability to automotive steel sheets. It showed excellent corrosion resistance even at a lower coating weight compared to GI steel sheet. It was also excellent in terms of galling and welding LME. Its spot welding life, electrodeposition coating, and bendability were equally excellent. This is presumed to be related to the formation of the Al-Zn-Si alloy phase at the interface of the coating layer.

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References

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