Zn-Al 금속용사 코팅 철근의 콘크리트 내 부식 특성에 관한 실험적 연구

Abstract

: The steel rebar corrodes in the chloride contaminated condition where the Cl- ions breakdown the passive film and leads the corrosion reaction. Therefore, different protective schemes such as using inhibitor, cathodic protection and deposition of coating onto the steel rebar, being adopted by the researcher and engineers. In the present studies, a 100 µm thick coating of Zn and 85Zn15Al alloy coating was deposited by arc thermal spray process where in the alloy coating, 15 wt.% Al was alloyed as feedstock in pure the Zn. The coated (Zn and 85Zn15Al) steel rebar was embedded in concrete by keeping 0.5 water/cement ratio. The corrosion performance of both coatings was studied in 3.5 wt.% NaCl under accelerated condition where 4 days of drying and 3 days was wetting at different duration. It is found that the alloying with 15 wt.% Al in Zn coating improves the corrosion resistance properties under accelerated condition