Experimental investigation of wear characteristics on manganese phosphate coated AISI D2 steel

Abstract

Manganese Phosphate is an Industrial coating used to reduce friction and improve lubrication in sliding components. In this study, the tribology behavior of uncoated, manganese phosphate coated, Manganese Phosphate with Molybdenum disulphide (MoS2) coated AISI D2 steels was investigated. The Surface morphology of manganese phosphate coatings was examined by Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Spectroscopy (EDX). The wear tests were performed in a pin on disk apparatus as per ASTM G-99 Standard. The wear resistance of the coated steel was evaluated through pin on disc test using a sliding velocity of 0.35 m/s under normal load of 10 to 60 N at the controlled condition of temperature and humidity. The Coefficient of friction and wear loss were evaluated. The temperature rise after 15 min and 30 min were recorded for each load. Wear pattern of uncoated, manganese phosphate coated and Manganese Phosphate with Molybdenum disulphide (MoS2) coated pins were captured using Scanning Electron Microscope (SEM). Based on the results of the wear test, the manganese phosphate with Molybdenum disulphide (MoS2) coating exhibited the lowest average coefficient of friction 0.15 and the lowest wear loss 0.6 mm3 under 60 N loads.