EFFECT OF ANNEALING TEMPERATURE ON HARDNESS AND WEAR RESISTANCE OF ELECTROLESSNi–B–MoCOATINGS

Serin, Ihsan Gökhan; Gökşenli, Ali

doi:10.1142/s0218625x15500584

Cited by 30 publications

(24 citation statements)

References 42 publications

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“…When Ni-B-Mo coatings are heat treated at 450 • C, a significant change in microhardness is not observed. 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%

“…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%

“…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].…”

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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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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: Composition Structure and Surface Morphology Of Nickel Bormentioning

confidence: 73%

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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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“…% sodium chloride solution, the electroless Ni-P-WC coatings showed significantly improved corrosion resistance due to its special structure, compared to a conventional Ni-P electroless coating, even after 40 days immersion, it also exhibited good corrosion resistance ability. Serin et al [27] examined the effect of annealing temperature on hardness and wear resistance of electroless Ni-B-Mo coatings. We studied the formation of Ni-B-Mo coating on steel by electroless plating and evaluated their morphology, hardness, and wear resistance after applying heat treatments at different temperatures for 1 h. Ni-B-Mo coating exhibits higher hardness than the substrate material steel.…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental Studies of Hardness Value and Corrosion Behavior of Coated Steel Bar

Kumar¹

2019

IJRASET

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Now-a-days steel is used in various construction structure such as building, bridges, pavement etc., but the major issue with the steel is, it easily gets corroded. Corrosion causes many important structure damage, many methods are used to increase the corrosion property of steel. Electroless coating was one of the modern technique to modify the surface property so that steel corrosion property. NiP coating was applied on steel 304. In this paper, NiP concentration variation and temperature variation was done along with presence or absence admixtures (such as-Lactic acid, Succinic acid, Citric acid) were used. The surface morphology was determined by FESEM Analysis and XRD Analysis, but hardness value and corrosion resistance of the substrate was determined by Vicker's micro-Hardness test and EIS Analysis respectively. Results obtained from these tests showed that the coating thickness increases with increases in NiP concentration as well as temperature increment in presence of admixture. In micro-Hardness test, hardness value of substrate was improved as coating thickness increases. Electrochemical impedance spectroscopy (EIS) test results also showed that corrosion potential of improved coated substrate was enhanced or modified than previous sample substrate.

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“…Ni-B kaplamaların özelliklerini geliştirmek için farklı yöntemler kullanılmıştır [16][17][18][19]. Kaplamaya bakır, tungsten, kobalt, molibden gibi ikinci bir metalin (M) eklenmesiyle Ni-B-M şeklinde kaplamaların oluşturulması bir alternatiftir [20][21][22][23][24]. Diğer bir yöntem ise kaplamaların içine WC, SiC, BN gibi farklı sert seramik parçacıkların ilave edilerek özellikle kaplamaların tribolojik özellikleri geliştirilmiştir [25][26][27][28].…”

Section: Introductionunclassified

Isıl İşlemin Akımsız Ni-B/Ni-B-W Dubleks Kaplamanın Korozyon Direncine Etkisinin Analiz Edilmesi

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Gökşenli

Yüksel

et al. 2020

Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi

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Bu çalışmada çelik malzemenin yüzeyi, akımsız kaplama yöntemi ile Ni-B/Ni-B-W ile kaplanmış, kaplamaların içyapı ve korozyon direnci incelenmiştir. Ni-B/Ni-B-W kaplaması asidik hipofosfit ve alkalin borohidrid indirgeyici banyolarla akımsız olarak kaplanmıştır. Kimyasal bileşim analizi için EDS yöntemi kullanılmıştır. Tarayıcı Elektron Mikroskobu (SEM) ile kaplamanın kesit ve yüzey morfolojisi incelenmiştir. SEM analizi sonucu kaplamaların üniform olduğu, yüzeye çok iyi bir adezif bağ ile gözeneksiz bir şekilde bağlandığı ve kaplamaların birbirleriyle uyumlu olduğu gözlemlenmiştir. XRD analizleri sonucu her iki kaplamanın da amorf yapıda olduğu, 450 ºC'de bir saat uygulanan ısıl işlem ile kaplamanın kristalleştiği ve nikel borit (Ni2B ve Ni3B) çökeltilerinin oluştuğu tespit edilmiştir. Çelik, ısıl işlem görmemiş ve görmüş NiB ve Ni-B/Ni-B-W kaplamaların korozif karakterini incelemek için 5% H2SO4 çözeltide daldırma ve Potansiyometrik Polarizasyon deneyleri (%3,5 NaCl sulu çözeltide) gerçekleştirilmiştir. Deneyler sonucu her iki tür kaplamanın korozyon direncinin kaplanan malzeme olan çelikten daha yüksek olduğu görülmüştür. Isıl işlem görmemiş Ni-B/Ni-B-W kaplamasının korozyon direncinin NiB kaplamaya göre daha iyi olduğu gözlemlenmiştir. Isıl işlemin uygulanması sonucu her iki kaplamanın da korozyon direnci artmıştır. Ancak Ni-B/Ni-B-W dubleks kaplamasında artış NiB kaplamaya göre daha fazladır. Kaplamaya tungstenin eklenmesi ile ısıl işlem sonrası yüzeyde oluşan koruyucu tungsten oksit tabakasından dolayı, kaplamanın korozyon direnci artırmıştır.

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EFFECT OF ANNEALING TEMPERATURE ON HARDNESS AND WEAR RESISTANCE OF ELECTROLESSNi–B–MoCOATINGS

Cited by 30 publications

References 42 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

Experimental Studies of Hardness Value and Corrosion Behavior of Coated Steel Bar

Isıl İşlemin Akımsız Ni-B/Ni-B-W Dubleks Kaplamanın Korozyon Direncine Etkisinin Analiz Edilmesi

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