Experimental Investigation on Hot Corrosion, Oxidation and Microstructure of WC Based Cermet HVOF Coating

Abstract

316LSS is used in various industrial applications, including heat exchangers, dyeing equipment, pulp and paper equipment, and marine equipment for chemicals, dyes, paper, oxalic acid, fertilizer, etc. Corrosion has always been the most serious problem across these applications. For this reason, this research specifies the features of 316LSS, the use of inhibitors for control, austenitic 316LSS research with inhibitor efficiency, the environment employed, its concentration, experimental analysis, and an emphasis on organic inhibitors for a sustainable industry. Applying thermally stable HVOF WC-10Co-4Cr powder coatings over the 316LSS can reduce this impact. The current study examines the effects of HVOF cermets powder coatings on the assessment of the 316L SS microstructure, oxidation, and corrosion behavior in a hostile situation of Na₂SO₄-88%Fe₂ (SO₄)₃ at 800 °C for up to 50 times. Every cycle lasted one hour at 800 °C for heating and twenty minutes at ambient temperature for cooling. The thermogravimetric method was used to study the hot corrosion kinetics, and it was discovered that these abide by the parabolic rate rule. The analysis of the results identified that the HVOF 86WC-10Co-4Cr sprayed coating on 316LSS has shown excellent oxidation and resistance to corrosion as compared to uncoated base metal and good coating adherence to the substrate under the tested environment.