Wear and Friction Properties of Electrodeposited Ni-Based Coatings Subject to Nano-enhanced Lubricant and Composite Coating

doi:10.1007/s40195-016-0470-6

Abstract

Abstract:

This paper presents research findings on the tribological performance of electrodeposited coatings subject to nano-lubricants with the addition of nano-Al₂O₃ and graphene and Ni/nano-Al₂O₃ composite coatings. Electrodeposited coatings were produced by using a pulse electrodeposition method. Tribological experiments were conducted by using a linear reciprocating ball on flat sliding tribometer. Experimental results confirmed that the wear and friction resistance properties were significantly enhanced by doping of nano-effects in the lubricating oil and composite coating. The addition of Al₂O₃ nanoparticles in the lubricating oil showed the best tribological properties, followed by Ni-Al₂O₃ composite coatings and nano-oil with graphene. The surface morphology and microstructure of electrodeposited coatings were examined by scanning electron microscopy, energy-dispersive spectroscopy and X-ray diffraction. The wear mechanisms of these coatings subjected to tribological testing were investigated by post-test surface analyses. This research provides a novel approach to design durable nano-coatings for tribological applications in various industries such as automotive, aerospace, locomotive and renewable energy technologies.

Key words: Tribology, Nanoparticles, Graphene, Nano-additives, Nano-coatings

Rizwan Bajwa,Zulfiqar Khan,H. Nazir,Vivek Chacko,Adil Saeed. Wear and Friction Properties of Electrodeposited Ni-Based Coatings Subject to Nano-enhanced Lubricant and Composite Coating[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(10): 902-910.

Figures/Tables 9

Fig. 1 Visual appearance of lubricants after combined ultrasonic and mechanical agitation: a pure oil, b oil + nano-Al2O3, c oil + graphene

Fig. 2 Schematic diagram of reciprocating sliding contact testing

Fig. 3 SEM surface morphologies and cross-sectional deposited thickness of pure nickel a, c and Ni/nano-Al2O3 electrodeposited coatings b, d, respectively

Fig. 4 XRD patterns of pure nickel a and Ni/nano-Al2O3 electrodeposited coatings b

Fig. 5 Variation in specific wear rate post-tribotesting conditions of Ni coatings under pure oil, Ni-Al2O3 under pure oil, Ni coatings under nano-oil with nano-Al2O3 and Ni coatings under nano-oil with graphene

Fig. 6 Variation in average friction coefficient post-tribotesting conditions of Ni coatings under pure oil, Ni-Al2O3 under pure oil, Ni coatings under nano-oil with nano-Al2O3 and Ni coatings under nano-oil with graphene

Fig. 7 SEM images with overall and magnified view of worn surface post-tribotesting conditions: a, e Ni coatings under pure oil, b, f Ni-Al2O3 under pure oil, c, g Ni coatings under nano-oil with nano-Al2O3, d, h Ni coatings under nano-oil with graphene

Fig. 8 EDS spectrum analysis of worn surface post-tribotesting conditions: a Ni coatings under pure oil, b Ni-Al2O3 under pure oil, c Ni coatings under nano-oil with nano-Al2O3, d Ni coatings under nano-oil with graphene

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