EFFECT OF ANNEALING TEMPERATURE ON HARDNESS AND WEAR RESISTANCE OF ELECTROLESSNi–B–MoCOATINGS

Ihsan Gökhan Serin () and Ali Göksenli ()
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Ihsan Gökhan Serin: Department of Mechanical Engineering, Gebze Technical University, 41400 Kocaeli, Turkey
Ali Göksenli: Faculty of Mechanical Engineering, Istanbul Technical University, 34437 Istanbul, Turkey

Surface Review and Letters (SRL), 2015, vol. 22, issue 05, 1-9

Abstract: Formation of nickel–boron–molybdenum(Ni–B–Mo)coating on steel by electroless plating and evaluation of their morphology, hardness and tribological properties post heat treatment at different temperatures for 1 h is investigated. The 25 μm thick coating is uniform and adhesion between the substrate and coating is good.Ni–B–Mocoating was amorphous-like structure in their as-plated condition and by 400°C heat-treated coating, nickel fully crystallized and nickel borides and molybdenum carbide were formed. All coatings exhibited higher hardness than the substrate steel. Hardness values of all coatings up to 400°C did not change distinctively but decreased partly beyond 400°C. Friction coefficient reached lowest value post heat treatment at 300°C but later increased with increasing tempering temperature. Wear resistance was lowest in as-plated coating; however it reached the highest value at 300°C. Worn surface of the coatings showed the abrasive wear as the dominant wear mechanism. An additional adhesive wear mechanism was detected in coating tempered at 550°C. Moreover, our results confirmed that the molybdenum addition improved the thermal stability of the resulting coating. Therefore,Ni–B–Mocoating has potential for application in precision mould, optical parts mould or bipolar plates, where thermal stability is essential.

Keywords: Electroless; Ni–B–Mo; coating; heat treatment; tribological properties; thermal stability (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1142/S0218625X15500584

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