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

摘要

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