| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 692805 | Progress in Organic Coatings | 2013 | 7 Pages |
The synthesis condition of potassium zinc phosphate pigment was optimized with respect to corrosion inhibition in extract solution and dispersion stability in an epoxy resin by application of Taguchi experimental design. Processing parameters, including calcinations time, quiescent time, mixing rate and KOH/ZnCl2 mole ratio are selected as the influential parameters. Corrosion inhibition of the pigments in the extract solutions and dispersion stability in the epoxy resin were evaluated by electrochemical impedance spectroscopy (EIS) and turbidity measurement, respectively. The pigment synthesized under optimal condition was characterized by XRD, which showed formation of KZnPO4 and KZn2PO4(HPO4). Corrosion protection of the epoxy coating containing synthesized pigment at optimal condition was evaluated by salt spray and compared to the unpigmented epoxy coating. Salt spray results showed higher corrosion protection of the epoxy coating in the presence of potassium zinc phosphate, which could be attributed to lower diffusivity of the pigmented coating to Cl− or formation of phosphate layer confirmed by SEM–EDX.
► Synthesis of potassium zinc phosphate pigment by Taguchi experimental design. ► Finding optimal synthesis condition regarding to anticorrosion properties. ► Finding optimal synthesis condition regarding to dispersion stability. ► Characterization of the synthesized pigment at optimal condition by XRD. ► Evaluation of the synthesized pigment at optimal condition by salt spray.
