Evaluation of the influence of experimental parameters in the formation of a vinyltrimethoxysilane film on 1010 carbon steel through electrochemical impedance spectroscopy and contact angle techniques

• New pretreatment of steel that can replace the phosphating and chromating.
• Factorial design successfully assisting in the search for an effective coating.
• Coated samples showed results superior impedance and contact angle.
• Experimental parameters were investigated as to the degree of significance.

The influence of experimental parameters on the formation of vinyltrimethoxysilane (VTMOS) film to protect 1010 carbon steel against corrosion by electrochemical impedance spectroscopy (EIS) and contact angle measurements was evaluated. Specimens were developed from three 23 factorial designs and an uncoated sample, where the EIS and contact angle were regarded as response variables. The results of coated samples were satisfactory as compared to those of uncoated carbon steel, as the former were better protected against corrosion, besides being more hydrophobic. The optimized specimens showed considerably increased EIS and contact angle values. It is concluded that the design of experiments developed favors to obtain a best finish of VTMOS silane on 1010 carbon steel, according to the EIS and contact angle techniques.