Solvent Effects on the Anticorrosive Properties and Active Coating Area of a Long Alkyd Varnish

The effect of nature and composition of solvent on the anticorrosive properties of a long alkyd varnish was studied using electrochemical impedance spectroscopy (EIS) after different days of immersion in 0.5M NaCl. The protection efficiency of the long alkyd varnish containing different solvents increased with increasing the volatility of solvent or composition of a given volatile solvent and this was confirmed using scanning electron microscopy and energy-dispersive X-Ray analysis. The delaminated area, the area where the organic coating is detached from the metal surface leaving it unprotected was found