Electrochemical Corrosion Behavior of Thermally Sprayed Nichrome Coating on Duplex Stainless Steel

Abstract

Corrosion is a natural phenomenon that gradually deteriorates any material. Mild steel structures are quickly corroded by the sea environment, and thus protective coatings are normally used to prevent corrosion. In this study, atmospheric plasma spray (APS) and detonation gun (DGun) coatings are used to deposit nichrome on duplex stainless steel (DSS 2205). The coated samples were immersed in 3.5 % sodium chloride solution to perform the electrochemical corrosion studies. Microstructural characterization was performed to determine the severity and nature of the corrosion damage. The study shows that DGun coatings are more efficient than APS coatings when combining potentiodynamic polarization curves and electrochemical impedance spectroscopy measurements. DGun-coated samples exhibit a dense microstructure and strong antiparticle adhesion as their primary attributes. This implies that the DGun coating reduces corrosion rates, increases structural longevity, decreases maintenance expenses, and stimulates economic growth.