Improved tribological and electrochemical behavior of concentrated chromite coatings developed by HVOF and plasma spray techniques

Surface Properties of Stainless Steel Coated by the HVOF Process

“…This finding is supported by previous research [17,19,21]. Conversely, when the distance is increased, the powders' melting problem can affect the coating's homogeneity until they reach the surface [11,18,22,25].…”

“…These values were obtained at a nozzle distance of 200 mm and after 20 passes. For example, a decrease in nozzle distance from 300m to 200m in the z6 sample increased hardness from 820 HV to 960 HV [25].…”

“…There are researchers who claim that the difference is due to issues with the focus between the sample and the nozzle [5,15]. It has been observed that changes in the chemical composition can affect the hardness values [17][18][19][20]25].…”

“…The WC hard phase has H and E values of approximately 24 GPa and 680 GPa, respectively. Additionally, the coating layer has fewer internal defects and lower porosity values, which is a crucial factor in achieving high hardness values [20][21][22][23][24][25]. The main output of these results is that the different surface hardness values exhibit additional surface wear resistance and friction coefficient.…”

“…Moreover, the adhesion of wear products to the surface can make it more challenging to establish contact. In terms of the effect of load and speed, the former has a more significant impact on wear rate than the latter [24,25,26].…”