Experimental investigation on effect of water jet erosion parameters on HVOF sprayed Cr 3 C 2 -NiCr coatings on stainless steel: a mathematical approach

Chromium carbides are major components in turbine blades due to their high wear resistance, low friction coefficient, and corrosion resistance at high temperature, typically manufactured by thermal spraying for coating applications. For their excellent oxidation and corrosion tolerance, high-speed thermal spray cermet coatings are commonly used to reduce wear at high temperatures and in corrosive conditions. Coatings based on Cr 3 C 2 -NiCr have been deposited by means of the HVOF thermal spraying technique on an AISI 304 steel substrate. Furthermore, the erosion behavior of the substrate and coated samples was tested using a water jet erosion test. The effect of water jet parameters, including angle of impingement, water jet velocity, standoff distance, and erodent discharge, on the erosion rate was systematically investigated. Experiments were conducted on the basis of the core composite architecture and the surface response approach for the creation of multiple regression models. Through the analysis of variance, the precision of the regression models was sufficient to establish associations between input parameters and responses. Results revealed that the most prevailing factor impacting the erosion rate of the coatings, followed by water jet velocity, standoff distance, and eroding discharge, was the angle of impingement.