한국표면공학회지 (Journal of the Korean institute of surface engineering)
- 제34권3호
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- Pages.187-194
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- 2001
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- 1225-8024(pISSN)
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- 2288-8403(eISSN)
Al-Zn-Si 3원계 합금도금강판의 부식거동에 관한 연구
A Study on the Corrosion Behavior by the Moisture on the Surface Layer of the Al-Zn-Si ternary alloys
초록
Galvalume sheet steel was developed recently, and is used widely in several fields. It has and had a good corrosion resistance in open atmosphere, but it has week corrosion resistance in the ambient surroundings of an airtight packing. Therefore, black patina was synthesized on the surface of Galvalume sheet steel. Corrosion by moisture on a Galvalume surface begins from edge of a droplet and proceeds to the center of droplet. It begins mainly on the interdendritic structure instead of dendritic structure. This suggests that corrosion by moisture occurs on the Zn shrinkage hole from rapid air cooling. In addition, the initial corrosion occurs by the local cell and continues by the oxygen concentration cell.
키워드