Comparative Study on Failure Regularity of Anti-corrosive Coating for Waterborne Concrete in Salinity Environment
In order to analyze the service effect and life expectancy of water-borne anti-corrosive coatings on concrete structures,the factors such as high temperature alternation and various salinity environments in saline soil area are fully considered,the long-term failure regularity of concrete anti-corrosive coating is studied.The macroscopical and microscopical surface morphologies of 3 kinds of waterborne concrete anti-corrosive coatings are analyzed under the conditions of wet-dry cycle and long-term immersion,the gloss,color difference and adhesion of the coating are tested under different cycles,logistic curve,S-curve and quadratic function curve are used to analyze the gloss,color difference and adhesion of the coating and to predict the service life.The result shows that(1)the waterborne epoxy coatings(ES),waterborne fluorocarbon coatings(FS)and waterborne acrylic coatings(AS)gradually lose their effectiveness under the action of long-term salinity,resulting in the expansion of coating pores and the loss of internal fillers,the process of delamination and fracture of a coating;(2)FS coating,ES coating and AS coating lost light completely after 60 d wet-dry cycles,and the colors change obviously after 70 d,the adhesion of their respective coatings also decrease with the increase of the cycle period of drying and wetting;(3)the life of FS,ES and AS coatings predicted by coefficient-weighted method of gloss,color difference and adhesion indicator are 2.45,2.48,2.74 a respectively,that is close to the life of coatings in salinity environment.The life prediction weighted analysis method can well reflect the salt corrosion law of different resin coatings,it can provide basis for accurately evaluating concrete corrosion behavior and protective effect of coating under actual environmental factors in saline soil area.
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