Passivation and chloride-induced corrosion of a duplex alloy steel in alkali-activated slag extract solutions

In this study, the passivation and chloride-induced corrosion behavior of a novel duplex alloy steel (00Cr10MoV) and low-carbon (LC) steel in ordinary Portland cement (OPC) extract solution and alkali-activated slag (AAS) extract solution were evaluated by electrochemical measurements and corrosion morphology observation. Seawater corrosion-resistant 00Cr10MoV steel with the addition of alloying elements Cr and Mo was designed to be used in concrete structures exposed to the tidal zone. The results show that 00Cr10MoV steel exhibits significantly higher corrosion resistance than LC steel in OPC extract with chlorides due to the formation of a more protective passive film. However, the high corrosion resistance of 00Cr10MoV steel is less pronounced in AAS extract with chlorides. Accordingly, this duplex alloy steel is not recommended to be utilized in combination with AAS materials in marine environments.