Electrochemical investigation on the corrosion inhibition of mild steel by calcium zinc phosphate nanoparticle

摘要

The present work reports the synthesis of calcium zinc phosphate nanoparticles and the characterization of the resulting pigments by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The anticorrosion activity of this nanoparticle in comparison with the commercial zinc phosphate pigment with respect to mild steel was investigated by electrochemical impedance spectroscopy (EIS), electrochemical noise (EN) and surface analysis. Electrochemical measurements of mild steel showed an improvement in corrosion resistance for the extract of calcium zinc phosphate in 3.5% NaCl solution which was connected to better solubility proved by ICP-OES. The calcium zinc phosphate nanoparticles and commercial zinc phosphate were also incorporated into epoxy coatings and their corrosion protection was evaluated by EIS and salt spray test. Results revealed that the calcium zinc phosphate nanoparticles resulted in greater improvement of the barrier and inhibitive properties of the epoxy coating than commercial zinc phosphate.