Micro-scale Observation of Corrosion of Hot-Dip Aluminized 11% Cr Stainless Steel
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Hot-dip aluminized coating has been widely used to protect steel substrate against corrosion. In this study,the corrosion behavior of hot-dip aluminized type 409L (11% Cr) stainless steel (SS) was investigated usingmacro- and micro-scale polarization tests. An Al-Fe-Si alloy layer that was formed due to inter-diffusionof alloying elements between Al coating and SS substrate was observed between Al coating and 409LSS substrate. In both macro- and micro-scale polarization tests, the corrosion potential (Ecorr) of the 409LSS substrate was much nobler than that of the Al coating and alloy layer. Ecorr of the alloy layer wasbetween that of Al coating and 409L SS substrate. This indicates that the alloy layer can act as a bufferbetween the more active Al coating and the nobler SS substrate for pit growth in aluminized SS. Thepresence of the alloy layer appears to be helpful in hindering pitting corrosion of aluminized SS.
Abstract
Hot-dip aluminized coating has been widely used to protect steel substrate against corrosion. In this study,the corrosion behavior of hot-dip aluminized type 409L (11% Cr) stainless steel (SS) was investigated usingmacro- and micro-scale polarization tests. An Al-Fe-Si alloy layer that was formed due to inter-diffusionof alloying elements between Al coating and SS substrate was observed between Al coating and 409LSS substrate. In both macro- and micro-scale polarization tests, the corrosion potential (Ecorr) of the 409LSS substrate was much nobler than that of the Al coating and alloy layer. Ecorr of the alloy layer wasbetween that of Al coating and 409L SS substrate. This indicates that the alloy layer can act as a bufferbetween the more active Al coating and the nobler SS substrate for pit growth in aluminized SS. Thepresence of the alloy layer appears to be helpful in hindering pitting corrosion of aluminized SS.
참고문헌 (10)
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