Abstract
A series of hybrid coatings based on epoxy resin, tetraethoxysilane and coupling agent, were synthesized through a sol-gel technique and characterized by Fourier-Transformation Infrared (FTIR), Scanning Electron Microscopy (SEM), and Atomic Force Microscopy (AFM). Their corrosion protection effect was evaluated on cold rolled carbon steel (CRCS) coupons by performing visual analysis (ASTM test) and electrochemical measurements (electrochemical noise). The best performance anticorrosive was for the 75 wt% epoxy-25 wt% silica system in 5 wt% aqueous NaCl electrolyte. Enhancement of corrosion protection effect of the hybrids coatings may be due to the increase of the adhesion strength of the hybrid sol– gel coatings on CRCS coupons relative to pure epoxy, which was further evidenced by the measuring adhesion by tape test (ASTM D3359-02).
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