Abstract
The problem of rapid metal dissolution and evolution of hydrogen (RDHE) of galvanized steel in fresh concrete have attracted attention recently. In this work, Cr-free oxidant MnO4- ion was introduced in simulated fresh concrete environment to inhibit RDHE of galvanized steel (GS). Results showed that MnO4- ion presented promising inhibition on both hydrogen evolution and anodic dissolution of GS. The presence of MnO4- ion significantly increased the corrosion potential of GS, and also caused the formation of (Mn, Ca)-containing protective film at corroding interface. This gave MnO4- ion high inhibition efficiency (>98%) on anodic dissolution and hydrogen evolution of GS.
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