Investigation of corrosion inhibition performance of ultrasonically prepared sodium zinc molybdate nanopigment in two-pack epoxy-polyamide coating

Abstract

In the present work, an innovative approach has been used to synthesize sodium zincmolybdate nanopigment using ultrasound-assisted co-precipitation of sodium molyb-date and zinc oxide. X-ray diffraction, Fourier transform infrared and elemental anal-ysis of sodium zinc molybdate nanopigment have been performed which confirmedthe formation of sodium zinc molybdate particles. Ultrasound-assisted synthesis gavelower particle size of sodium zinc molybdate nanoparticles (467 nm) which can beexplained on the basis of improved solute transfer rate, rapid nucleation, and forma-tion of a large number of nuclei in the presence of ultrasound. The corrosion inhibi-tion effect of sodium zinc molybdate nanopigment in 2K (two-pack) epoxy-polyamide clear coat on low carbon steel has also been studied. The results of thecorrosion rate analysis, Tafel plots, and electrochemical impedance spectroscopy ofthe prepared coatings show better corrosion inhibition performance when sodiumzinc molybdate particles were incorporated in the 2K epoxy-polyamide clear coat.