Optimization of a Waterborne Epoxy Coatings Formulation via Experimental ‎Design

W aterborne Epoxy based coatings ‎were prepared by using a water-‎borne epoxy resin and a suitable ‎hardener. The formulation and ‎optimization procedure were ‎carried out on the bases of ‎experimental designs by the ‎mixture design technique in which ‎the important paint properties are ‎modeled by using special cubic ‎model. The corrosion behavior of ‎these coatings was investigated ‎using electrochemical impedance ‎spectroscopy (AC impedance ‎spectroscopy) for a period of 21 ‎day exposure to a solution of 3.5 ‎wt% NaCl in distilled water. ‎Coating parameters such as the ‎pore resistance and the coating ‎capacitance were measured by ac ‎impedance technique and ‎considered as the response in the ‎experimental design. Prog. Color ‎Colorants Coat.‎