Chemically deposited Ni-W-B coatings: Composition, structure, and properties

Дровосеков, А. Б.; Ivanov, M. V.; Krutskikh, V. M.; Лубнин, Е. Н.; Polukarov, Yu. M.

doi:10.1007/s11124-005-0008-1

Cited by 35 publications

(31 citation statements)

References 4 publications

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“…While there have been a numerous studies on hypophosphite-reduced electroless plating, researches on boron, one of the most important amorphous elements, containing deposits has shifted. Sodium borohydride or dimethylamine borane (DMAB) is widely used as reducing agents to attain electroless Ni-B deposits [4], [5] Ni-W-B deposition which provides higher wear resistance can be procured by adding sodium tungstate to the electroless Ni-B bath [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatments for Electroless Deposited Ni-B and Ni-W-B Coatings on 7075 Al Alloy

Yildiz¹,

Genel²,

Gülmez³

2017

IJMMM

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Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatments for Electroless Deposited Ni-B and Ni-W-B Coatings on 7075 Al Alloy

Yildiz¹,

Genel²,

Gülmez³

2017

IJMMM

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“…To enhance characteristics of the Ni-B coatings, different methods are applied, like applying heat treatments, adding different hard particles like WC, SiC, BN etc. or a second metal element such as copper, tungsten, cobalt, or molybdenum into the coating (Ref [10][11][12]. In earlier studies, it is concluded that this change in structure causes an increase in hardness and wear resistance because of the formation of grains and hard precipitations (Ref [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Annealing Temperature on the Corrosion Resistance of Electroless Ni-B-Mo Coatings

Serin

Gökşenli

Yüksel

et al. 2015

J. of Materi Eng and Perform

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The Ni-B-Mo coating on steel by electroless plating and the evaluation of the morphology and corrosion performance after applying heat treatments at different temperatures for 1 h were investigated in this study. The 25-lm-thick coating was uniform and adhesion between the substrate and the coating was good. The coating consisted of an amorphous-like structure in their as-plated condition, and after annealing at 400°C for 1 h, crystallized nickel, nickel borides, and molybdenum carbide were formed. Immersion tests in 10% HCl solution and potentiodynamic polarization measurements in 3.5% NaCl aqueous solution were applied to investigate corrosion resistance. The corrosion performance of heat-treated coatings was compared with steel and the as-plated coating. By increasing the annealing temperature, corrosion potential shifted toward a noble direction, corrosion current density decreased and the weight loss of specimens decreased, demonstrating an increase in corrosion resistance. Best corrosion performance was achieved by the coating heat treated at 550°C .

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“…However, the major nickel borides formed during the heat treatments might have prevented the formation of the B-W bond. 9,15 In other words, the quantity of the boron in the coating was high enough to prevent the formation of Ni-W compounds in the structure. 16 SEM micrographs of the Ni-P/Ni-B-W coatings before and after the heat treatments showed the formation of typical spherical nodular structures (Figure 2).…”

Section: Discussionmentioning

confidence: 99%

Corrosion resistance of as-plated and heat-treated electroless dublex Ni-P/Ni-B-W coatings

Yüksel¹,

Erdoğan²,

Baştan³

et al. 2017

Mater. Tehnol.

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In this study, Ni-P/Ni-B-W dublex coatings were deposited on carbon steel substrates (AISI 1020) using the electroless plating process and their microstructure and corrosion properties were systematically evaluated based on different heat-treatment temperatures. Both, the surface morphology and cross-sectional morphology of the Ni-P/Ni-B-W coatings were studied using a scanning electron microscope (SEM), while X-ray diffraction (XRD) was applied for examining the structural modifications. The amorphous coating began to crystallize at a heat-treatment temperature of 350°C. Potentiodynamic polarization measurements were carried out in an aqueous medium containing 3.5 % NaCl for evaluating the corrosion resistance of as-plated and heat-treated dublex coatings. The corrosion potentials of dublex coatings were observed to shift toward more positive values with increased heat-treatment temperatures. Depending on the heat-treatment temperature, it was identified that the crystallized dublex coatings generally had better corrosion resistance than the amorphous coating. Keywords: Ni-P/Ni-B-W coating, corrosion, heat treatment V {tudiji so bile dvojne Ni-P/Ni-B-W prevleke nane{ene na substrate iz ogljikovega jekla (AISI 1020) s postopkom neelektri~nega platiranja. Sistemati~no so bile ocenjene mikrostruktura ter korozijske lastnosti izdelanih prevlek, glede na razli~ne temperature toplotne obdelave. Morfologije povr{in in profili izdelanih Ni-P/Ni-B-W prevlek so bili pregledani z vrsti~nim elektronskim mikroskopom (SEM), medtem ko so bile z rentgensko difrakcijsko analizo (XRD) ugotovljene strukturne spremembe. Amorfna prevleka je za~ela kristalizirati pri temperaturi toplotne obdelave 350°C. Korozijska odpornost platiranih in toplotno obdelanih dupleks prevlek je bila ocenjena s pomo~jo meritev potenciodinami~ne polarizacije v 3,5 % vodni raztopini NaCl. Opazovali so korozijske potenciale dupleks prevlek, da bi dobili bolj pozitivne vrednosti z zvi{animi temperaturami topolotne obdelave. Ugotovljeno je bilo, da imajo kristalizirane dupleks prevleke na splo{no bolj{o korozijsko odpornost kot amorfne prevleke.

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Chemically deposited Ni-W-B coatings: Composition, structure, and properties

Cited by 35 publications

References 4 publications

Effect of Heat Treatments for Electroless Deposited Ni-B and Ni-W-B Coatings on 7075 Al Alloy

Effect of Heat Treatments for Electroless Deposited Ni-B and Ni-W-B Coatings on 7075 Al Alloy

Effect of Annealing Temperature on the Corrosion Resistance of Electroless Ni-B-Mo Coatings

Corrosion resistance of as-plated and heat-treated electroless dublex Ni-P/Ni-B-W coatings

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