Corrosion inhibition of galvanized steel by MnO4- ion as a soluble inhibitor in simulated fresh concrete environment

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. (C) 2020 Elsevier Ltd. All rights reserved.