Abstract
The improvement of the anti-corrosion performance of reinforcing steel is crucial for extending the service life of reinforced concrete (RC) structures. This study proposes a novel approach to enhance the corrosion resistance of carbon steel in concrete exposed to aggressive environments. By applying a phytic acid (PA) composite pretreatment layer with polyvinyl alcohol (PVA) and potassium titanate whisker (PTW), a protective film containing corrosion inhibitors was formed, resulting in improved resistance to chloride attack. The PA-PVA grafting solutions effectively fixed PTW onto the steel surface due to their strong chelating ability, while the PTW skeleton structure not only increased the pretreatment layer thickness but also provided space for loading corrosion inhibitors. The fundamental characteristics of the pretreatment layer were evaluated using SEM-EDS, XRD, ATR-FTIR and XPS. Meanwhile, electrochemical results showed that carbon steel exhibited improved corrosion resistance to chloride attack with high inhibition efficiency owing to the formation of a bilayer protective film. As a newly developed pretreatment layer, it is expected that the PA composite pretreatment layer will confer multifunctional properties to RC structures.
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