Abstract
Conductive epoxy resin based composite coatings were prepared by physical blending process and then applied onto on Q235 carbon steel surface.The results show that there existed lots of micro- blisters in the pure E51 epoxy coating without pigments,which deteriorate the protectiveness of the coatings.In the contrast,the quantity of the micro-blisters of the conductive composite coatings was decreased greatly by adding pigments.The test results of immersion in 3%Na Cl solution and salt spray indicated a superior corrosion resistance of the composite coatings.After corrosion test,no bubbling or pickling for the composite coatings could be observed and no corrosion was detected for Q235 carbon steel underneath the coatings.Electrochemical experiments revealed that the impendence of the E51 coating decreased fast,while that of the composite coatings increased with the immersion time in 3.5%Na Cl solution.The composite coatings have 'self- healing' ability.The electric resistance and adhesion strength of the composite coatings are in the order of 103Ω·cm and 9.12 MPa respectively.
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