Electroless Nickel Boron Plating on Aa6061

Dadvand, N.; Kipouros, Georges J.; Caley, W. F.

doi:10.1179/000844303794406143

Cited by 3 publications

(11 citation statements)

References 2 publications

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“…[18] An additional increase in the bath pH slightly decreases the plating rate. The decrease in the deposition rate with the increase in the bath pH in the alkaline region (pH > 7) is in agreement with the results reported by Dadvand [6] for the EN-P plating of an aluminum alloy substrate. The activity of free nickel ions decreases as the number of ligand molecules bound to the nickel ions increases.…”

Section: Effect Of Time On Thickness Of En-p Depositsupporting

confidence: 91%

“…24 ; the pH was adjusted to 4.87; and the temperature was 85°C. [6] Figure 9 shows the effect of citric acid (complexing agent) concentration on the deposition rate of the electroless nickel plating. It acid causes an increase in the deposition rate, which passes through a maximum as the concentration of citric acid increases.…”

Section: Effect Of Time On Thickness Of En-p Depositmentioning

confidence: 99%

“…Therefore, e may be set to a value of 0 and the term [HPO 3 2À ] in Eq. [2] may be ignored, [6] giving…”

Section: Effect Of Time On Thickness Of En-p Depositmentioning

confidence: 99%

“…The decrease in the deposition rate through the addition of the complexing agent followed by a plateau was also reported by Dadvand et al, who used glycine as a complexing agent. [6] To determine the reaction order d, the data presented in Figure 9 are split into two groups: one in which the deposition rate increases with an increasing citric acid concentration and another in which the increase in citric acid concentration causes the deposition rate to decrease. The slopes of the two lines in Figures 10 and 11 are the values of d for the increasing and decreasing portion of the deposition rate, respectively.…”

Section: Effect Of Time On Thickness Of En-p Depositmentioning

confidence: 99%

“…Finally, the source of nickel ions is provided by adding a nickel salt in the form of either a sulfate or a chloride (the sulfate is preferred when the coatings are required for corrosion resistance applications). Electroless techniques for coating aluminum [6][7][8][9] and magnesium [10][11][12] alloys have been developed in our laboratory.…”

Section: Introductionmentioning

confidence: 99%

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Electroless Nickel Phosphorus Plating on AZ31

Shartal

Kipouros

2009

Metall Mater Trans B

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One of the major drawbacks to using magnesium parts in automotive applications is poor corrosion resistance, which can be improved with a nickel-boron coating placed on a nickelphosphorus coating, which, in turn, is placed on a phosphate-permanganate conversion-coating layer produced on the magnesium alloy AZ31. This work reports on the determination of the optimum kinetic parameters for producing a coherent nickel-phosphorus coating using an electroless-procedure phosphate-permanganate conversion-coating layer and for studying the effects of the experimental variables of the electroless plating process on the phosphorus content, surface morphology, and structure of the electroless nickel-phosphorus (EN-P) coatings produced. Measurements of the plating rate as a function of experimental variables such as the compositions of the plating bath constituents, temperature, and pH were implemented using the weight-gain method; the phosphorus content of the EN-P coatings was measured using energydispersive spectroscopy (EDS) analysis. The surface morphology of the coating was examined using a scanning electron microscope (SEM); X-ray diffraction (XRD) was used to characterize the structure of each coating. An empirical rate law was determined for EN-P plating on a phosphate-permanganate conversion coating. It is found that the deposition rate of the EN-P coating increases by increasing the deposition temperature, the concentration of free nickel ions, and the concentration of hypophosphite ions in the plating bath. In addition, the deposition rate decreases by increasing both the plating bath pH and the concentration of citric acid in the plating bath.

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Section: Effect Of Time On Thickness Of En-p Depositsupporting

confidence: 91%

Section: Effect Of Time On Thickness Of En-p Depositmentioning

confidence: 99%

“…Therefore, e may be set to a value of 0 and the term [HPO 3 2À ] in Eq. [2] may be ignored, [6] giving…”

Section: Effect Of Time On Thickness Of En-p Depositmentioning

confidence: 99%

Section: Effect Of Time On Thickness Of En-p Depositmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electroless Nickel Phosphorus Plating on AZ31

Shartal

Kipouros

2009

Metall Mater Trans B

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Coating different thickness nickel–boron nanolayers onto boron carbide particles

Zhu¹,

Dong²,

Lu³

2008

Surface and Coatings Technology

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Effect of Microstructure and Phosphorus Content on the Corrosion Behaviour of Electroless Nickel-Phosphorus Coatings

Dadvand¹,

Caley²,

Kipouros

2006

Canadian Metallurgical Quarterly

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The effects of microstructure and phosphorus (P) content on the corrosion characteristics of electroless Ni-P coatings on mild steel in a 3.5 wt% NaCl solution were investigated using a potentiodynamic technique. The results indicate that the anodic and cathodic behaviour of the coatings varied with changes in the structure, morphology and phosphorus contents of the coatings. Different alloy compositions and heat treatment conditions influenced both the microstructural characteristics and crystallization behaviour of the deposit. The addition of thiourea to the electroless plating solution increased the intrinsic stress due to the stabilizing effect on the bath. It is postulated that the coating should enjoy enhanced corrosion resistance for applications where mild steel is in contact with a saline environment.Résumé -On a étudié les effets de la microstructure et de la teneur en phosphore (P) sur les caractéristiques de corrosion de revêtements de déposition autocatalytique de Ni-P sur l'acier à faible teneur en carbone dans une solution de 3.5% en poids de NaCl, en utilisant une technique potentiocinétique. Les résultats indiquent que les comportements anodique et cathodique des revêtements variaient avec les changements de structure, de morphologie et de teneur en phosphore des revêtements. Différentes compositions d'alliage et différentes conditions de traitement thermique influençaient à la fois les caractéristiques de microstructure et le comportement de cristallisation du dépôt. L'addition de thiourée à la solution de déposition autocatalytique augmentait la contrainte intrinsèque, dû à l'effet de stabilisation du bain. On postule que le revêtement devrait jouir d'une résistance améliorée à la corrosion dans les applications où l'acier à faible teneur en carbone est en contact avec un environnement salin.

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Electroless Nickel Boron Plating on Aa6061

Cited by 3 publications

References 2 publications

Electroless Nickel Phosphorus Plating on AZ31

Electroless Nickel Phosphorus Plating on AZ31

Coating different thickness nickel–boron nanolayers onto boron carbide particles

Effect of Microstructure and Phosphorus Content on the Corrosion Behaviour of Electroless Nickel-Phosphorus Coatings

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