Erosion wear evaluation of HVOF sprayed WC-12Co coating on some pipeline materials using Taguchi approach

Abstract

Pipeline materials used for the transportation of bottom ash slurry generally suffer from intense wear due to slurry erosion. In this work, High-Velocity Oxy-Fuel (HVOF) spray process was used for the deposition of WC-12Co coating on the Mild steel, SS 304 and SS 202. Slurry erosion pot tester was used for erosion tests of uncoated and coated materials. Effects of three factors namely slurry concentration, the speed of impacting particles and erosion test duration on erosion rate were investigated using the Taguchi approach. Influence of speed of impacting particles on the erosion rate of uncoated and all the coated materials was found to be maximum, which was followed by erosion test duration and then slurry concentration. WC-12Co coating showed significant improvement in erosion wear resistance of three substrate materials namely mild steel, SS 304 and SS 202. WC-12Co coating showed the brittle mechanism of erosion wear. After the Taguchi analysis slurry erosion results were further validated with analysis of variance (ANOVA). From both ANOVA and Taguchi analysis, it was observed that the influence of speed is maximum on the erosion wear of all the uncoated as well as WC-12Co coated specimens, followed by time and slurry concentration. K e y w o r d s : bottom ash, slurry erosion, pipeline steel, HVOF spray

Abrasive Wear Behavior of Cryogenically Treated Boron Steel (30MnCrB4) Used for Rotavator Blades

“…Poor abrasive wear behavior makes farmers less efficient and plays a major role in raising the cost of agriculture [2] by adversely affecting farmers' productivity, thereby making the whole process of agriculture economically unviable. Scientists and researchers have applied different techniques such as coatings [3][4][5][6][7][8][9][10][11][12][13][14], carburizing [15], nitriding and carbonitriding [15], boriding [15][16][17][18][19][20], and shot peening [21] to enhance the working life of rotavator blades. These techniques have shown promising results with regard to improving wear resistance in the short term, but limited data related to the long term success of these techniques is reported in the published work.…”

Tribological Study of HVOF Sprayed Tungsten Carbide Coated Stainless Steel

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