Influence of particle size on the microstructure, hardness and corrosion resistance of electroless Ni–P–Al2O3 composite coatings

Balaraju, J.N.; Kalavati,; Rajam, K.S.

doi:10.1016/j.surfcoat.2005.03.007

Cited by 172 publications

(64 citation statements)

References 13 publications

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“…Their nature and shape differ depending on the goals. The reinforcement of the second phase can be hard oxides (Al 2 O 3 and TiO 2 ) [4] or carbide particles (SiC [3], WC [5], B 4 C [6], diamond [7] and nitride [8]). Solid lubricants (PE [9], PTFE [10], graphite [11] and MoS 2 [12]) can reduce the friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

Development of nickel–phosphorus coatings containing micro particles of talc phyllosilicates

Alexis

Gaussens

Etcheverry

et al. 2013

Materials Chemistry and Physics

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Section: Introductionmentioning

confidence: 99%

Development of nickel–phosphorus coatings containing micro particles of talc phyllosilicates

Alexis

Gaussens

Etcheverry

et al. 2013

Materials Chemistry and Physics

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“…Inclusion of hard particles like oxides, carbides, ceramics and insoluble powders in NiP coatings were attempted [10]- [12] and found increases the hardness and wear resistance. Successful co-deposition of the included particle depends on size distribution [13], bath composition and inert nature of the particle. Co-deposition of Al 2 O 3 particles in electoless nickel was attempted by many researchers [14], [15] and the co-deposition is still at the experimental stage.…”

mentioning

confidence: 99%

Influence of Nano Al2O3 Particles on the Adhesion, Hardness and Wear Resistance of Electroless NiP Coatings

Karthikeyan¹,

Vijayaraghavan²

2015

IJMMM

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Abstract-In this present study electroless NiP coatings and NiP-Al 2 O 3 coatings had been deposited on a mild steel substrate. The surface morphology of both the coatings had studied using scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction technique. Adhesion, hardness and wear behavior were investigated and compared for NiP and NiP-Al 2 O 3 coatings. Optical micrograph images were used for the evaluation of adhesion of coatings which found sufficient and acceptable according to VDI 3198 standard. Hardness of the coating had been evaluated based on depth sensing techniques and substrate effect had avoided by maintaining depth to coating thickness ratio less than 0.1. Due to co-deposition of Al 2 O 3 particles the hardness of NiP coatings increased by 20.5% (7.8 GPa to 9.4 GPa). Dry sliding wear tests were conducted on PLINT TE66 micro scale tester against steel ball of hardness 800 HV. Wear resistance of NiP coatings increased with increase in sliding distance. The co-deposition of Al 2 O 3 particles in NiP matrix arrest the deformation during sliding of steel ball and thus wear resistance of NiP-Al 2 O 3 coatings is superior to NiP coatings. Wear crater morphology were studied using SEM and EDS. Adhesive wear mechanics was observed in NiP coatings and combination of adhesive and abrasive wear mechanism were found in NiP-Al 2 O 3 coatings.

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“…Several factors influence the incorporation of hard and soft particles in an electroless Ni-P matrix including particle size and shape, relative density of the particle, particle charge, inertness of the particle, the concentration of particles in the plating bath, the method and degree of agitation, the compatibility of the particle with the matrix, and the orientation of the part being plated. [6,7] S.R. Allahkaram et al [8] reported deposition, characterization and electrochemical evaluation of Ni-P-nanodiamond composite coatings, In their study Ni-P/nano-diamond composite deposition were coated on steel substrate and the optimum concentration of diamond nano-particles was found by study of hardness measurement, linear polarization and electrochemical impedance spectroscopy (EIS).…”

Section: Introductionmentioning

confidence: 99%

Structure analysis of electroless Ni-P-Al2O3 nanocomposite coatings

Hong¹,

Yu-bao²

2017

Proceedings of the 2017 6th International Conference on Energy, Environment and Sustainable Development (ICEESD 2017)

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Abstract. Ni-P-Al 2 O 3 nano-composite coatings were successfully fabricated on a P20 plastic die steel surface by electroless plating process containing sulfate nickel, sodium hypophosphate and suspended Al 2 O 3 nanoparticles. The pH value and temperature of the electroless bath were 4.5 and 87ºC, respectively. The coating was characterized for its microstructure, morphology, microhardness and corrosion resistance. Surface analysis using a field emission scanning electron microscopy (FESEM) showed that the dispersible Al 2 O 3 nanoparticles were co-deposited with electroless Ni-P coating onto substrates, the incorporation in Ni-P matrix of Al 2 O 3 nanoparticles increases the nodularity of composite coatings. The crystallinity, phases and element distribution of coating were analyzed by X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS). It was evident that the X-ray diffraction pattern of the composite coating is similar to that of nanoparticle free coating, both coatings have amorphous structures.

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Influence of particle size on the microstructure, hardness and corrosion resistance of electroless Ni–P–Al2O3 composite coatings

Cited by 172 publications

References 13 publications

Development of nickel–phosphorus coatings containing micro particles of talc phyllosilicates

Development of nickel–phosphorus coatings containing micro particles of talc phyllosilicates

Influence of Nano Al2O3 Particles on the Adhesion, Hardness and Wear Resistance of Electroless NiP Coatings

Structure analysis of electroless Ni-P-Al2O3 nanocomposite coatings

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