An acetic acid-activated cementitious anticorrosive coating for rusty carbon steel was developed.Nineteen groups of mixtures were designed and the optimal mixture of the coating was ascertained by comprehensively examining the mechanical properties,bonding strength and coating performance of the cementitious materials.Based on the heat of cement hydration,X-ray diffraction tests and scanning electron microscopy tests,the mechanism of acetic acid activation of cement was elucidated.The an-ticorrosive performance of the coating was studied through electrochemical impedance tests.The results show that the acetic acid activation can accelerate the early hydration of cement,whereby the hardening time of the paste is shorted and promoting the de-velopment of early strength.The cement particles are dispersed by acetic acid,and on the coating surface are tightly connected,with a high coating density and favorable anticorrosion property.The charge transfer resistance of the coating,after soaking in a 3.5％NaCl solution for 20 days,remain attaining 3.68×105 Ω·cm2.
acid-activatedsteel corrosioncementitious materialsanticorrosive coatingheat of hydrationelectrochemical impedance
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