Pulse Plating of Ni-W-B Coating and Study of Its Corrosion and Wear Resistance

Hosseini, Mir Ghasem; Ahmadiyeh, Somayeh; Rasooli, Ali; Khamenehasl, S H

doi:10.1007/s11661-019-05444-1

Cited by 15 publications

(14 citation statements)

References 59 publications

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“…The coating's hardness and elastic modulus are improved upon heat treatment within 300 °C to 450 °C with the formation of Ni 2 B, Ni 3 B phases [21,22]. The binary alloy coatings are developed along with different elements such as Mo, W and investigated the coating characteristics [19,[23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Tribo-mechanical behaviour of electroless Ni-B-Mo coatings with varying bath composition

Barman

Sahoo

2023

Eng. Res. Express

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Ni-B-Mo alloy coating layers are developed on steel substrates with various coating bath compositions to investigate the significance of bath parameters on coating characteristics. The as-deposited coatings are characterized based on surface roughness, coating thickness, surface morphology, and phase structure through Surface Roughness Tester, Scanning Electron Microscopy (SEM), and X-ray Diffraction (XRD), respectively. Tribological behaviour of the coated layers is investigated through a pin-on-disc multi-tribo tester under dry condition. Surface hardness and elastic modulus are measured through nano-indentation tests. The scratch-hardness of the coatings is measured using a micro-scratch tester. Coating characteristics are determined and the significance of each coating bath parameter is analysed. It is found that the coating thickness increases with bath parameter concentration level due to increase in borohydride concentration. The increase in molybdenum concentration increases the surface roughness (Ra) from 0.28 µm to 1.05 µm and forms coarse grained surface morphology with some visible cracks leading to increase in COF value from 0.24 to 0.77. Nano-hardness and scratch hardness are found to decrease with the addition of molybdenum into the Ni-B matrix though nano-hardness (Hv) value increases from its minimum value of 530 to 971 due to the increase in boron concentration. The elastic modulus value is found to vary from 83 GPa to 197 GPa but no such specific trend may be observed with the variation of bath composition.

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Section: Introductionmentioning

confidence: 99%

Tribo-mechanical behaviour of electroless Ni-B-Mo coatings with varying bath composition

Barman

Sahoo

2023

Eng. Res. Express

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“…A profilometer (PFM-3320 contact profilometer, Sharif Solar, Tehran, Iran) assessed the initial Ra of the samples. The accuracy range of the z determination was 50nm (with a maximum range of 200 µm) and steps for scanning the surface were <2.5µm [22]. The measurements were made three times for each sample; finally, the mean values were calculated.…”

Section: Methodsmentioning

confidence: 99%

Pre-Heating of Low-Shrinkage Composite Resins: Effects on Color Stability and Surface Roughness

Oskoee¹,

Oskoee²,

Azar³

et al. 2022

fid

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Objectives: The present study aimed to investigate the effect of preheating on the color stability and surface roughness of a silorane-based composite resin. Materials and Methods: A total of 44 Filtek P90 composite resin disks, (10mm×1mm), were fabricated using plastic molds and were divided into two groups. In group 2, the composite resin syringes were placed in a thermostatically controlled water bath at 55‒60°C before preparing the disks. After polishing the samples with silicon carbide papers, they were stored in distilled water for 48 hours. Roughness and color parameters were then measured in two stages: immediately after retrieval from distilled water and after 40 days of storage in tea solution. Finally, the differences in roughness and color parameters were recorded. Independent sample t-test and regression analysis were used at a significance level of P<0.05. Results: Based on the findings of the present study, there was no significant difference among the mean ∆E values (P=0.4); however, a significant difference in mean surface roughness (P=0.01) was found between the two groups. Regression analysis showed a significant relationship between the study groups in terms of surface roughness and ΔE values (preheated: r2 = 0.73; non-preheated: r2= 0.76). Conclusion: Filtek P90 silorane-base composite showed ΔE>3.3 and surface roughness above 0.2µ under preheated and non-preheated conditions and discoloration increased following preheating.

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“…The elastic modulus and surface hardness both are found to enhance due to formation of boride phases till annealing temperature of 450 °C [8,[17][18][19]. The borohydride reduced thin film coated specimens are also developed with co-deposition of tungsten as well as molybdenum to study the properties [18][19][20][21][22][23][24][25]. The substrates covered with Ni-B-Mo as well as Ni-B-W display a cauliflower like surface texture [8,20,26,27] which is very often seen in Ni-B based electroless coatings.…”

Section: Introductionmentioning

confidence: 99%

Tribological behavior of electroless Ni-B ternary and quaternary coatings with inclusion of W and Mo

Barman,

Sahoo

2024

Phys. Scr.

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Electroless nickel coatings help to tailor requisite surface properties in materials for use in various applications. The aim of the present study is to examine the tribological behavior of electroless nickel-boron coatings incorporated with Mo and W. The coated layers are developed over pin samples with various bath compositions. The coated specimens are characterised to assess their basic features. The tribological tests are carried out with the help of a pin-on-disc tribo-tester under dry conditions. The coating characteristics are determined to comprehend the importance of tungsten as well as molybdenum concentration in electroless nickel-boron coatings. In the as-deposited state, all the coated specimens displayed a surface morphology resembling cauliflower. Moreover, the roughness of these coated surfaces in their as-deposited state showed an increase corresponding to the concentration of the bath parameter, resulting in a higher coefficient of friction (COF). The addition of Mo into Ni-B matrix promotes the coarse grained and cracked surface morphology leading to highest friction coefficient value of as-deposited Ni-B-Mo coatings. The highest surface roughness of Ni-B-Mo coatings also leads to the highest specific wear rate due to breaking and crushing of roughness peaks. The present study reveals the effect of incorporation of W and Mo in electroless Ni-B coatings to control the friction and wear characteristics of the specimens. This will help in deciding the proper electroless bath compositions for specific tribological applications.

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Pulse Plating of Ni-W-B Coating and Study of Its Corrosion and Wear Resistance

Cited by 15 publications

References 59 publications

Tribo-mechanical behaviour of electroless Ni-B-Mo coatings with varying bath composition

Tribo-mechanical behaviour of electroless Ni-B-Mo coatings with varying bath composition

Pre-Heating of Low-Shrinkage Composite Resins: Effects on Color Stability and Surface Roughness

Tribological behavior of electroless Ni-B ternary and quaternary coatings with inclusion of W and Mo

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