Influence of the Tungsten Content on Surface Properties of Electroless Ni-W-P Coatings

Oliveira, Mara Cristina Lopes de; Corrêa, Olandir Vercíno; Ett, Bardia; Sayeg, Isaac Jamil; Lima, Nelson Batista de; Antunes, Renato Altobelli

doi:10.1590/1980-5373-mr-2017-0567

Cited by 18 publications

(15 citation statements)

References 42 publications

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“…9. Thus, even though the P content is almost same in both the coatings, there is a difference in W content which leads to microscopically heterogeneous coatings [50,51]. The cauliflower like appearance can be noticed in Ni-P-W coatings obtained at the initial test run (Fig.…”

Section: Characterization Of Ni-p-w Coated Steel Rebarsmentioning

confidence: 90%

“…9). With an increase in W content, the compactness of nodular structure was favored [50]. Also, there is a correlation between coating morphology and corrosion resistance.…”

Section: Characterization Of Ni-p-w Coated Steel Rebarsmentioning

confidence: 97%

“…They were also the process parameters of the experimental optimization and listed in Table 1. The process parameters and their levels were selected based on previous work and careful study of literature [47,48,50,51]. After deposition, rinsing in deionized water was carried out following which the specimens were dried.…”

Section: Figure 1 Steps Of Specimen Preparationmentioning

confidence: 99%

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Corrosion performance of steel rebars by application of electroless Ni-P-W coating: An optimization approach using grey relational analysis

Mukhopadhyay¹,

Sahoo²

2021

FME Transactions

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Electroless deposited Ni-P-W coatings were investigated as a potential candidate for corrosion prevention of steel rebars subjected to chloride environment. Potentiodynamic polarization was utilized to test corrosion resistance of bare and coated rebars. Taguchi based grey relational analysis was used to predict a bath composition that would result in enhanced corrosion resistance of the coated rebars. Higher corrosion potential (-258 mV) and low corrosion current density (0.065 mA/cm2) could be achieved compared to bare rebars (-653 mV, 11.7 mA/cm2) for a nickel sulphate concentration of 30 g/l, sodium hypophosphite concentration of 17 g/l and sodium tungstate concentration of 20 g/l in the coating bath. The morphology of the bare and coated rebars post corrosion revealed severe cracking of the bare rebars. While the Ni-P-W coated rebar at optimal bath combination predicted by Taguchi method suffered negligible damage in chloride environment with the onset of an oxide layer.

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Section: Characterization Of Ni-p-w Coated Steel Rebarsmentioning

confidence: 90%

“…9). With an increase in W content, the compactness of nodular structure was favored [50]. Also, there is a correlation between coating morphology and corrosion resistance.…”

Section: Characterization Of Ni-p-w Coated Steel Rebarsmentioning

confidence: 97%

Section: Figure 1 Steps Of Specimen Preparationmentioning

confidence: 99%

See 1 more Smart Citation

Corrosion performance of steel rebars by application of electroless Ni-P-W coating: An optimization approach using grey relational analysis

Mukhopadhyay¹,

Sahoo²

2021

FME Transactions

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“…Among various surface treatments 12,13 , environmentally friendly electroless plating without external power is advantageous to form a uniform and crack-free coating [14][15][16][17][18] . Therefore, electroless may be a promising candidate to face with the inevitable problems and extend the use of magnesium alloys 19,20 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Na2WO4 Concentration on the Microstructure and Corrosion Behavior of Ni-W-P Ternary Alloy Coatings

et al. 2021

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Ni-W-P ternary coating was successfully deposited on AZ91D magnesium alloy by electroless plating with low energy consumption. The effect of Na 2 WO 4 concentration on the microstructure, deposition rate, corrosion behavior, adhesion force, porosity test and micro-hardness of Ni-W-P ternary coatings were evaluated. Results reveal that when the concentration of Na 2 WO 4 is 15 g/L in the plating solution, the coating with the average thickness of 17 μm is uniform and dense, and the content of phosphorus and tungsten reached 9.63 wt.% and 1.14 wt.% respectively, which presents amorphous structure. Meanwhile, when the concentration of Na 2 WO 4 is 15 g/L, the amorphous Ni-W-P ternary coating has the best corrosion resistance, among which E corr is -0.326 V, I corr is 0.003 A/cm 2 in 3.5 wt.% NaCl solution. In addition, the mechanisms of corrosion resistance for the substrate and the coating were exploded.

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“…As tungsten increase the phosphorus decrease and make enhancement changes in nanocrystalline phase composition [21]. By heating the deposits of the binary and ternary alloys, the hardness increase [22]. At 400°C show crystallinity of Ni [23].…”

Section: Introductionmentioning

confidence: 99%

Structure and Corrosion Behavior of Nano-Crystalline Ni-P Alloy Containing Tungsten

Gooda¹,

Khalifa²,

El-Aziz³

et al. 2021

AJPC

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The whole world is interested in the metal industry and its permanent development. One of these metals is carbon steel. Therefore, scientists tend to improve the properties of this metal, in this research we have improved the properties of carbon steel through electroless plating process of Ni-P and Ni-W-P alloys. In different industries, electroless nickel-phosphorus Ni-P and nickel-tungsten-phosphorus Ni-W-P deposits have been commonly used as engineering safety coatings. In our research, Ni-P and Ni-W-P were deposited on low carbon steel by using acid bath. To study the improvement of the properties of the coats, microstructure analysis investigated by thin film (XRD), coat's morphology by electron microscope scan (SEM), analyzing the coat by X-ray dispersive energy (EDX) and protection of corrosion of the coats were determined by potentiodynamic polarization measurements in artificial sea water (3.5% NaCl solution). The results indicated that the phases formed from the electroless coating give excellent corrosion resistance of low carbon steel and also indicated that the alloy formed in the presence of tungsten through the electroless bath give higher corrosion protection than that formed without it. As the concentration of tungstate increase in the bath, coat has higher corrosion protection i.e. Ni-W-P III>Ni-W-P II >Ni-W-P I>Ni-P.

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Influence of the Tungsten Content on Surface Properties of Electroless Ni-W-P Coatings

Cited by 18 publications

References 42 publications

Corrosion performance of steel rebars by application of electroless Ni-P-W coating: An optimization approach using grey relational analysis

Corrosion performance of steel rebars by application of electroless Ni-P-W coating: An optimization approach using grey relational analysis

Effect of Na2WO4 Concentration on the Microstructure and Corrosion Behavior of Ni-W-P Ternary Alloy Coatings

Structure and Corrosion Behavior of Nano-Crystalline Ni-P Alloy Containing Tungsten

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