Investigation of structural and tribological properties of                     electroless Ni–B coated pure titanium

Çelik, I.; Karakan, Mehmet; Bülbül, Ferhat

doi:10.1177/1350650115588568

Cited by 33 publications

(21 citation statements)

References 31 publications

(34 reference statements)

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“…This could be an indication of higher thermal stability of the deposits [29,39]. High microhardness of heat treated Ni-B and its ternary variants are in accordance with the literature [23][24][25][26][27][28][29].…”

Section: Microhardness Of Nickel Boron and Its Variantssupporting

confidence: 89%

“…Therefore, for thin coatings, it is always suitable to address nano-hardness instead of micro-hardness, keeping in mind the thickness of the films. While EN coatings have been widely characterized by the micro-indentation technique in other research works [23,25], the microhardness results reported in Table 5 are in line with them. Furthermore, as the present work considers a similar group of coatings and their comparative study with consistent indentation depth for all the three variants, the results are comparable within the coating groups.…”

Section: Microhardness Of Nickel Boron and Its Variantssupporting

confidence: 76%

“…Similar results have also been obtained for Ni-B-Mo coatings heat treated at 350 • C, as can be seen in Figure 2. Although, stable Ni 3 B phases are observed along with Ni (111) on heat treating Ni-B-Mo coating at 450 • C for 1 h. Precipitation of hard boride phases on heat treating Ni-B and its variants has been also reported in the literatures [23][24][25][26][27][28][29].The analysis of XRD results is presented in Table 3. The procedure for calculation of absolute integrated intensity of peaks and crystallite size is mentioned elsewhere [13,40].…”

Section: Composition Structure and Surface Morphology Of Nickel Bormentioning

confidence: 73%

“…This is attributed to the high hardness, self-lubricating microstructure and columnar growths [24]. Consequently, a reduction in the actual contact area takes place, thereby improving the tribological characteristics [25]. Suitable treatments of Ni-B coatings may even lead to microhardness that is equivalent to chromium [26].…”

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Comparative Study of Tribological Behavior of Electroless Ni–B, Ni–B–Mo, and Ni–B–W Coatings at Room and High Temperatures

et al. 2018

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Ni-B alloys deposited by the electroless method are considered to be hard variants of the electroless nickel family. Inclusion of Mo or W to form ternary alloys improves the thermal stability of electroless nickel coatings. Therefore, in the present work, Ni-B, Ni-B-Mo, and Ni-B-W coatings are deposited; and their tribological behavior at room and high temperatures are investigated. Electroless Ni-B, Ni-B-Mo, and Ni-B-W coatings are deposited on AISI 1040 steel substrates. The coatings are heat treated to improve their mechanical properties and crystallinity. Tribological behavior of the coatings is determined on a pin-on-disc type tribological test setup using various applied normal loads (10-50 N) and sliding speeds (0.25-0.42 m/s) to measure wear and coefficient of friction at different operating temperatures (25 • C-500 • C). Ni-B-W coatings are observed to have higher wear resistance than Ni-B or Ni-B-Mo coatings throughout the temperature range considered. Although for coefficient of friction, no such trend is observed. The worn surface of the coatings at 500 • C is characterized by lubricious oxide glazes, which lead to enhanced tribological behavior compared with that at 100 • C. A study of the coating characteristics such as composition, phase transformations, surface morphology, and microhardness is also carried out prior to tribological tests. Lubricants 2018, 6, 67 2 of 17The Ni-B alloy coating has higher wear resistance and low COF compared with Ni-P alloy [23]. This is attributed to the high hardness, self-lubricating microstructure and columnar growths [24]. Consequently, a reduction in the actual contact area takes place, thereby improving the tribological characteristics [25]. Suitable treatments of Ni-B coatings may even lead to microhardness that is equivalent to chromium [26]. As a result of this, Ni-B coatings are considered to be a suitable alternative to chromium, which has environmental concerns. Friction and wear characteristics of magnesium and aluminium alloys that are widely used commercially could be improved by Ni-B alloy deposition [27]. An improvement of tribological behavior of Ni-B coatings is also achieved on inclusion of W or Mo [28,29]. In fact, co-deposition of nano Al 2 O 3 results in an increase in microhardness bỹ 290 HV 100 [30]. The mass loss and COF of Ni-B-Al 2 O 3 coatings is almost six and two times lower, respectively, in comparison with Ni-B alloy in as-deposited state. Similar results have been also observed on inclusion of B 4 C nano-particles [31]. Impregnation of Ni-B coatings with PTFE (40%) results in a COF as low as <0.1 in non-lubricated, as well as 3.5% NaCl lubricated sliding condition [32]. Electroless Ni-B coatings have been applied in greaseless guns and barrel bores that are subjected to hostile environments proving to be a suitable replacement to chromium [33]. Recent studies have focused attention on duplex and multi-layer coatings that possess intermediate/enhanced tribological characteristics compared with the single layered binary alloys [34,35]....

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Section: Microhardness Of Nickel Boron and Its Variantssupporting

confidence: 89%

Section: Microhardness Of Nickel Boron and Its Variantssupporting

confidence: 76%

Section: Composition Structure and Surface Morphology Of Nickel Bormentioning

confidence: 73%

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confidence: 99%

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Comparative Study of Tribological Behavior of Electroless Ni–B, Ni–B–Mo, and Ni–B–W Coatings at Room and High Temperatures

et al. 2018

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“…The columnar growth of Ni-B coatings reduces their actual area of contact, and acts as a pocket for retaining lubricants [4]. The mechanical and wear properties are further enhanced during heat treatment, due to the precipitation of hard boride phases [5]. Thermochemical treatment/nitriding and vacuum heat treatment have a positive effect on the coating properties [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of Electroless Ni-B-W-Mo Coatings Using Electrochemical Impedance Spectroscopy

Mukhopadhyay¹,

Barman²,

Sahoo³

2019

Port. Electrochim. Acta

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Quaternary NiB -W-Mo coatings were deposited on AISI 1040 steel by the electroless method. Some of the specimens were heat-treated at 300, 350, 400, 450 and 500 °C, for 1 hour. The deposited coatings contained a high weight percentage of W, and a low B content was detected by energy dispersive X-ray analysis. The coatings in as-deposited state were amorphous, and heat treatment resulted in crystallization with the precipitation of borides. W and Mo were present in the coatings, mainly in a solid solution form. The surface morphology study revealed densely nodulated structures, which are pertinent for sodium borohydride reduced electroless nickel coatings. Electrochemical impedance spectroscopy studies were conducted to determine the corrosion resistance of the as-deposited and heat-treated coatings in a 3.5% NaCl electrolyte. The corroded surfaces were observed under scanning electron microscope, to study the corrosion mechanism.

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Investigation and Optimization of Tribological Behavior of Electroless Ni–B Coating at Elevated Temperatures

Mukhopadhyay

Barman

Sahoo

2019

Lecture Notes on Multidisciplinary Industrial Engineering

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Investigation of structural and tribological properties of electroless Ni–B coated pure titanium

Cited by 33 publications

References 31 publications

Comparative Study of Tribological Behavior of Electroless Ni–B, Ni–B–Mo, and Ni–B–W Coatings at Room and High Temperatures

Comparative Study of Tribological Behavior of Electroless Ni–B, Ni–B–Mo, and Ni–B–W Coatings at Room and High Temperatures

Corrosion Resistance of Electroless Ni-B-W-Mo Coatings Using Electrochemical Impedance Spectroscopy

Investigation and Optimization of Tribological Behavior of Electroless Ni–B Coating at Elevated Temperatures

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