Comparative Studies on Steel Corrosion Resistance of Different Inhibitors in Chloride Environment: The Effects of Multi-Functional Protective Film

A corrosion inhibitor was widely used to improve resistance of steel bar in reinforcement concrete structure. kind multi-component inhibitor, which is composed organic and inorganic substances, developed this research. This comparatively studied with various other inhibitors by using open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) methods. The results show that the OCP values charge transfer (calculated EIS curves) remain, respectively, as high −0.45 V 932.19 kΩ·cm−2 after 60 days immersion, are significantly better than groups. Wide passivation interval peaks voltammograms were applied analyze mechanism adsorption (organic substance) oxidation–reduction reactions (inorganic substance). functional groups -OH triethanolamine (TEA) tri-isopropanolamine (TIPA) bond surface quickly, behaving an adsorbent substance early age. An additional protective precipitate related Fe3+ formed substances (Fe2(MoO4)3 FePO4), consistent equivalent circuits. As eco-friendly substitute, possess similar or even protecting effects on bars comparison calcium nitrite. In addition, concept a “multi-functional film” proposed, providing new insight achieve modified anti-corrosion capacity inhibitors.