Tribological Behavior of Electroless Ni–P Coating in Brine Environment

The present paper considers the comparative study of tribological characteristics of various electroless alloy coatings viz. Ni-P, Ni-P-W and Ni-P-Cu. The tribological behavior of these coatings depends on various parameters like load, speed, lubricant, chemical compositions and heat treatment temperature to a great extent. One of the main effects of heat treatment on these coatings is phosphide precipitation, which makes them suitable for anti-wear applications. The property of binary Ni-P can be further improved by depositing third particles electrolessly. The phase structure of the coatings depends on the amount of phosphorous and heat treatment temperature. The tribological behavior of heat treated samples reveals that Ni-P-W deposit shows higher coefficient of friction and lowest wear among these three types coatings. Very high tungsten concentration retard the phosphide precipitation, thus low concentration of tungsten and low heat treatment temperature produce better coating. In case of Ni-P-Cu, medium concentration of copper and medium heat treatment temperature produces better coating.

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Characterization of Thermal Stability and High-Temperature Tribological Behavior of Electroless Ni-B Coating

Metallurgical and Materials Transactions A ◽

10.1007/s11661-018-4599-y ◽

2018 ◽

Vol 49 (8) ◽

pp. 3217-3236 ◽

Cited By ~ 7

Author(s):

Soupitak Pal ◽

Rohit Sarkar ◽

Vikram Jayaram

Keyword(s):

Thermal Stability ◽

High Temperature ◽

Tribological Behavior ◽

Electroless Ni

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Tribological Behavior and Corrosion Resistance of Electroless Ni-B-W Coatings

Journal of Molecular and Engineering Materials ◽

10.1142/s2251237317500101 ◽

2017 ◽

Vol 05 (03) ◽

pp. 1750010 ◽

Cited By ~ 3

Author(s):

Arkadeb Mukhopadhyay ◽

Tapan Kumar Barman ◽

Prasanta Sahoo

Keyword(s):

Heat Treatment ◽

Corrosion Resistance ◽

Wear Rate ◽

Crystallite Size ◽

Tribological Behavior ◽

Columnar Structure ◽

X Ray ◽

Pin On Disc ◽

Friction Performance ◽

Electroless Ni

The present study considers the tribological behavior and corrosion resistance of electroless Ni-B-W coatings deposited on AISI 1040 steel substrates. Coating is characterized using scanning electron microscopy, energy dispersive X-ray analysis and X-ray diffraction technique. In as-deposited condition, coatings are found to be amorphous. On heat treatment, precipitation of crystalline Ni (1 1 1) and its borides take place. For as-deposited coating, the microhardness is obtained as [Formula: see text]759[Formula: see text]HV[Formula: see text] which increases to [Formula: see text]1181[Formula: see text]HV[Formula: see text] and [Formula: see text]1098[Formula: see text]HV[Formula: see text] when heat treated at 350[Formula: see text]C and 450[Formula: see text]C, respectively. Incorporation of W in Ni-B coating results in an increase of hardness by 89[Formula: see text]HV[Formula: see text] in as-deposited condition. Heat treatment also results in increase in crystallite size of Ni (1 1 1). Wear rate and coefficient of friction (COF) of the coatings are evaluated on a pin-on-disc setup under both dry and lubricated sliding conditions. Wear resistance is observed to improve on heat treatment with an increase in crystallite size while COF deteriorates. However, in as-deposited condition, wear rate and COF of Ni-B-W coatings improve by [Formula: see text]5 and [Formula: see text]3 times, respectively, compared with Ni-B coatings. Wear and friction performance of the coatings are enhanced under lubrication due to the columnar structure of the coatings that retain lubricants. Corrosion resistance of Ni-B-W coating in 3.5% NaCl solution gets improved on heat treatment.

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Evaluation of the mechanical properties and tribological behavior of the CrN coating deposited on mild steel modified with electroless Ni interlayer

Thin Solid Films ◽

10.1016/s0040-6090(00)01310-9 ◽

2000 ◽

Vol 377-378 ◽

pp. 354-359 ◽

Cited By ~ 23

Author(s):

Fan-Bean Wu ◽

Jeng-Jen Li ◽

Jenq-Gong Duh

Keyword(s):

Mechanical Properties ◽

Mild Steel ◽

Tribological Behavior ◽

Crn Coating ◽

Ni Interlayer ◽

Electroless Ni

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Optimization of Wear Performance of Electroless Ni-B Coating under Lubrication

International Journal of Engineering and Technologies ◽

10.18052/www.scipress.com/ijet.7.94 ◽

2016 ◽

Vol 7 ◽

pp. 94-103 ◽

Cited By ~ 6

Author(s):

Santanu Duari ◽

Arkadeb Mukhopadhyay ◽

Tapan Kumar Barman ◽

Prasanta Sahoo

Keyword(s):

Tribological Behavior ◽

Normal Load ◽

Substrate Material ◽

X Ray Diffraction ◽

Wear Performance ◽

X Ray ◽

Confirmation Test ◽

Pin On Disc ◽

Electroless Ni ◽

Wear Tests

This paper presents an experimental study on tribological behavior of electroless Ni-B coating under lubricated condition based on Taguchi’s method. Mild steel specimens are used as the substrate material for the deposition of Ni-B coating and the thickness of the deposits is found to be around 35 μm. Based on Taguchi’s L27 orthogonal array of experiments, the wear tests are done on a pin-on-disc type tribotester This experiment is carried out by utilizing the combination of process parameters of the tribotester like normal load, sliding speed and duration of sliding. The analysis of the experimental data is carried out with the help of MINITAB® software package. It is seen that the normal load is the most significant factor followed by sliding time at 99% confidence level. The surface morphology, composition and compound analysis of the coatings are done by means of scanning electron microscope, energy dispersed X-ray micro-analyzer and X-ray diffraction analyzer respectively. Finally, a confirmation test is carried out to validate the analysis.

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