Rapid Evaluation of Anti-corrosive Property of Marine Protective Coatings

摘要

To develop long-term anticorrosive coatings for protection of steel structures and ships and platforms, and to shorten exploitation period of this type coating, the anticorrosive property of three marine anticorrosive coatings systems with the Fluorocarbon top coating, Fluoro/acrylate top coating and Fluoro varnish top were evaluated rapidly by the accelerated corrosion environmental spectra test and Surface Stability Test (SST) based on Electrochemical Impedance Spectroscopy (EIS). A corrosive environmental spectrum, which includes salt fog test, immersion test and UV irradiation test blocks, was proposed for accelerated test of marine protective coatings. Performence of the three systems was tested with scratched specimens and uniform specimens, and evaluated by using glossimeter, stereo microscope and image process. The results show that the system with Fluoro varnish top coating has much better anti-corrosive property than the others. The results obtained by SST method agree well with those by the accelerated corrosion environmental spectra test. SST method is a more easy-to-use and more rapid method to evaluate the anti-corrosive property of metal coated by protective coatings.