Anticorrosion Behavior of Nickel-Rich Conductive Coating in Red Soil and the Effects of Fe2(SO4)3 on its Corrosion Resistance

Anticorrosive conductive coatings were prepared by adding solvents, dispersants, nickel powders, etc. to acrylic resin coatings with high viscosity, and conductive coatings were prepared on the surface of Q235 steel. The effects of nickel powder contents on the corrosion resistance of the conductive coating were investigated in a red soil solution, for which electrochemical impedance spectroscopy, Tafel polarization curve and corrosion morphology analysis were used. Adding different concentrations of Fe2(SO4)3 to the red soil solution, the effect of Fe2(SO4)3 content on the corrosion resistance of the conductive coating was studied. The results show that anti-corrosion performance of the coating material is variable according to the degree of hydrolysis. Besides, the content of nickel powder and Fe2(SO4)3 is also related to the anti-corrosion performance. The higher the content of nickel powder, the worse the corrosion resistance. The higher the content of Fe2(SO4)3 in the red soil solution, the lower the coating impedance and the worse the corrosion resistance. Fe2(SO4)3 will accelerate the corrosion reaction. A Fe2(SO4)3 catalyzed kinetic mechanism is advanced to expound accelerated corrosion process.