Structure and phase transformation behavior of electroless Ni–P alloys containing tin and tungsten

Balaraju, J.N.; Jahan, S. Millath; Jain, Anjana; Rajam, K.S.

doi:10.1016/j.jallcom.2006.07.045

Cited by 71 publications

(27 citation statements)

References 34 publications

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“…In general, these Nyquist diagrams show a semi-elliptic arc in the investigated frequency range. This implies that the same fundamental processes must be occurring on all these coatings butover a different area in each condition as recorded by Kumar and Balaraju et al [2,12]. The occurrence of a single semi-circle in the Nyquist plots indicates that the corrosion process of these coatings involves a single time constant.…”

Section: Potentiodynamic Polarization Testmentioning

confidence: 58%

“…The purpose of the duplex Ni-W-P layer on Ni-P coating can be explained by the fact that Ni-W-P has better properties in terms of corrosion and wear than Ni-P which in turns, has better adhesion/contact with the mild steel substrate, so that it acts as better intermediate layer [7][8][9]. The improved corrosion resistance of this coating is due largely to the huge amount of grain boundary diffusion paths provided by the nanostructure of the Ni 3 P and crystalline Ni at high temperature, caused by the furnace annealing especially if air cooled, which favored the formation of the dense nickel-tungsten and nickel oxide films on the surface [10][11][12][13]. Fig 1, shows a mini-prototype bath for electroless plating with compositions and operating conditions outlined in Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Deposition and Electrochemical Corrosion Behavior of Electroless Ni-P/Ni-W-P Duplex Plating on Mild Steel Substrate

Razaq¹,

Zhu²,

Liu³

2014

JMSE-B

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Abstract:The emergence of electroless Ni-P based ternary coatings and consequence duplex deposition possibilities, now offer more excellent corrosion and functional properties in acidic and alkaline environment. In this study, medium and high phosphorus Ni-P and duplex Ni-W-P coatings were produced and sequentially deposited on mild steel using plating baths with 10 g/L and 25 g/L of sodium hypophosphite as reducing agent (RA) with composition of the resulting deposits to be 91.5 Ni: 8.5 P and 87.6 Ni: 12.4 P, respectively. From the field-emission scanning electron microscope (FE-SEM) examination, the deposit morphology was found to change from nodular with some surface porosity to become more dense and smoother after heating treatment between 200-600 °C. The cross-section reveals firm adhesion of the as-plated and the merging of the top duplex layers of the heat treated sample as a result of tungsten diffusion. The potentiodynamic polarization test shows that the coating demonstrated significant improvement of corrosion resistance in 3.5% NaCl solution with optimum performance at 600 °C. The noted improved corrosion resistance of the coating came as a result of annealing which strengthened the layer and broaden its application.

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Section: Potentiodynamic Polarization Testmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Deposition and Electrochemical Corrosion Behavior of Electroless Ni-P/Ni-W-P Duplex Plating on Mild Steel Substrate

Razaq¹,

Zhu²,

Liu³

2014

JMSE-B

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“…The hardness of ENP composite coatings is dependent on the types of particles used (specifically whether they are hard or soft). As the concentration of hard particles such as SiC and Si 3 N 4 increases, the coating hardness increases [64]. Increasing the number of soft particles such as PTFE [65] in the composite results in a decrease in coating hardness.…”

Section: Hardnessmentioning

confidence: 99%

Recent advances in electroless-plated Ni-P and its composites for erosion and corrosion applications: a review

et al. 2018

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The metallic coating of surfaces plays a vital role in the protection of most industrial applications. Coatings can be carried through various routes (e.g., mechanical and electrochemical plating techniques). Electroless nickel coatings present unparalleled properties and a unique combination of corrosion and wear resistance features. Recently, the use and development of electroless nickel-phosphorus (ENP) coatings has attracted broad attention from many industries (e.g., oil and gas) due to their superior corrosion and wear resistance properties. In the present review article, mechanisms of ENP and preparation methods are briefly outlined. The review sheds light on properties of electroless Ni-P coatings and of their nanocomposites with an emphasis on new products and on their future development.

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“…[1][2][3][4] In order to meet the engineering application as coating, some metals like tungsten and tin are added in Ni-P matrix to further enhance their properties. 5,6 Among them, Ni-W-P ternary alloy has received considerable attention because tungsten possesses unique properties such as high melting point (3410 • C), low coefficient of linear thermal expansion and high tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of bulk liquid undercooling and crystallization behaviors of jet electrodeposition Ni–W–P alloy

Wang

Xing

et al. 2015

Bull Mater Sci

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The undercooling of Ni-W-P ternary alloy coating melt was investigated by in situ differential scanning calorimeter (DSC) with the flux processing technique. The results showed that the highest undercooling of Ni-W-P ternary alloy with 359 K was obtained as the thermal treatment temperature of the melt being 1679 K and the cooling rate being 50 K min −1 . When cooling rate is fixed, the change of undercooling depends on the melt processing temperature, and the undercooling will increase rapidly at the first stage. The effects of thermal treatment temperature and cooling rates on the undercooling were discussed.

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Structure and phase transformation behavior of electroless Ni–P alloys containing tin and tungsten

Cited by 71 publications

References 34 publications

Deposition and Electrochemical Corrosion Behavior of Electroless Ni-P/Ni-W-P Duplex Plating on Mild Steel Substrate

Deposition and Electrochemical Corrosion Behavior of Electroless Ni-P/Ni-W-P Duplex Plating on Mild Steel Substrate

Recent advances in electroless-plated Ni-P and its composites for erosion and corrosion applications: a review

Characteristics of bulk liquid undercooling and crystallization behaviors of jet electrodeposition Ni–W–P alloy

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