Abstract
The coatings are utilised on any materials as a protective layer. The coating characteristics are dependent on their composition, phase structure and surface morphology. In this current investigation, the coated specimens are developed by chemical deposition method with the incorporation of tungsten (W) and molybdenum (Mo) either alone or jointly into Ni–B matrix. The coatings are studied to make a comparative analysis on mechanical behaviours of the as-deposited coatings to understand the impact of bath parameters. Steel made square samples are coated with borohydride reduced coatings with various compositions. The coating characterisations are carried out for the elemental analysis of the coated specimens as well as their surface morphology. The coated layer thicknesses are found to rise due to rise in concentration for all types of coatings under study. The nanoindentation tests are conducted to determine elastic modulus and nanohardness. The scratch hardness tests are carried out using a micro-scratch tester. The boron concentration is found to increase with chemical solution element concentrations which contribute to increase the nanohardness. The nanohardness of Ni–B–W–Mo coatings is found to be better than untreated binary and ternary coatings at higher compositions. The scratch hardness of untreated Ni–B–W coatings is observed to possess its maximum value across the examined range due to the presence of boron and tungsten. The nanohardness and scratch hardness of untreated Ni–B–Mo coatings increase with concentration level in the coating bath but remained lower than other variants.
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Abbreviations
- BM:
-
Electroless Ni–B–Mo coating
- BW:
-
Electroless Ni–B–W coating
- BWM:
-
Electroless Ni–B–W–Mo coating
- EDAX:
-
Energy dispersive X-ray analysis
- HL:
-
Higher level
- LL:
-
Lower level
- ML:
-
Middle level
- NB:
-
Electroless Ni–B coating
- SEM:
-
Scanning electron microscopy
- XRD:
-
X-ray diffraction
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Barman, M., Barman, T.K. & Sahoo, P. Effects of W and Mo Concentrations on Mechanical Behaviour of Ni–B Based Coatings—A Comparative Study. J. Inst. Eng. India Ser. D (2024). https://doi.org/10.1007/s40033-024-00696-7
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DOI: https://doi.org/10.1007/s40033-024-00696-7