Effect of Processing Parameters on the Protective Quality of Electroless Nickel-Phosphorus on Cast Aluminium Alloy

Ajibola, Olawale Olarewaju; Oloruntoba, Daniel Toyin; Adewuyi, B. O.

doi:10.1155/2015/386347

Cited by 7 publications

(6 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aluminium can react with acids, bases and alkalis due to its amphoteric nature. Thus they are designed and manufactured with adequate consideration for their surface protection with the view to reducing the effects of wear and corrosion on surface [4][5][6][7]. Hydraulic brake and clutch master cylinders and pistons are widely made from aluminium alloys and steels [8,9].…”

Section: Introductionmentioning

confidence: 99%

Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid

Ajibola

Ige

Olubambi

2018

IJET

View full text Add to dashboard Cite

The twofold impact of wear and corrosion on wrought A6061 alloy in hydraulic DOT3 brake fluid environment was studied. The wear studies were performed on the samples using a developed wear-jig. Weight loss corrosion test method was used to determine the corrosion rate of the wrought A6061 alloy samples immersed in the brake fluid for a total of 1680 hours. From the results of wear tests carried out on the A6061 alloy sample with brake oil, the highest wear value of 5.24x10-7 mg/mm2/cycle (approx.) was obtained from 6 N (approx) force after 130 minutes. The wrought A6061 alloy material demonstrated the highest corrosion rates nearly 3.0 x10-2 mg/mm2/yr within the early 168 hours of immersion in brake fluid. The result is practically lower than the corrosion rate of cast specimen in DOT3 brake oil or some other alloys immersed in other corrosive media that were previously reported in the literature. The results show that small amount of chemical corrosion is sufficient to cause and accelerate mechanical wear of the material in usage.

show abstract

Section: Introductionmentioning

confidence: 99%

Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid

Ajibola

Ige

Olubambi

2018

IJET

View full text Add to dashboard Cite

show abstract

“…To control the pH, NaOH can be added to the solution as well. [12][13][14][15][16][17] Heat treatment is usually performed on the Ni-P electroless coatings to improve the properties such as hardness, adhesiveness, resistance to creep, resistance to wear. Structural changes occur in these coatings when heated above 220-260ºC temperature range.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Electroless Bath Parameters and Heat Treatment on the Properties of Ni-P and Ni-P-Cu Composite Coatings

et al. 2018

View full text Add to dashboard Cite

NiP -(Cu) composite coatings were applied on a St37 steel in an acidic bath of hypophosphite composite. The effect of the concentration of the Cu particles and pH of the solutionon the amount of Ni and P of the coatings, their morphology, and hardness of the coatings were explored. Some of the coated samples were also heat treated at 400ºC for 1 hour. The phases formed, the microstructure and the amount of the alloying elements of the coatings were analyzed by X-Ray powder diffraction (XRD), Scanning Electron Microscope (SEM) equiped with Energy Dispersive Spectroscopy (EDS). Results show that although adding Cu particles reduced the hardness of NiP coating (from 482.4 to 351.2 VH in 1 gr/lit Cu), within NiP -Cu composite coatings the hardness of NiP -Cu composite coating increased from 351.2 to 380.7 VH by increasing the Cu particles from 1 to 7 gr/lit. The structure of the coating was crystalline during the heat treatment making the coating harder. With increasing the pH of the solution from 4.5 to 7 and then to 9, the weight percent of P and the particle of Cu were reduced.

show abstract

“…The process is autocatalytic and the most acceptable of all the mechanisms established for the EN deposition given by Agarwala and Agarwala [21]. EN plating is a delicate process that is operated under strict guidelines for the best results, because the quality of the EN deposition is dependent on the working parameters [22][23][24][25][26][27]. Pari et al, [28] carried out an extensive study on the performance of electroless-nickel plating on aluminium for cylinder liners.…”

Section: Introductionmentioning

confidence: 99%

Comparative effects of corrosion on electroless -nickel plated A6061 alloys in DOT3 brake fluid

Ajibola¹,

Olubambi²

2018

IJET

View full text Add to dashboard Cite

Aluminium alloys used in automobile brake master cylinder pistons wear by corrosion due to contamination and chemical reaction of the contacting brake fluid. The study investigates the corrosion of electroless-nickel (EN) deposition enhanced cast aluminium alloy master cylinder piston surfaces immersed in hydraulic brake oil. Cast specimens were produced from the as-received wrought A6061 alloy scrap by sand casting. EN plated as-received and cast aluminium alloys specimens were immersed fully in brake oil for 1680 hours and corrosion rates were determined every 24 hours. Test samples were characterised using the hardness tester, atomic absorption spectrometer, metallurgical photo-microscope, x-ray diffractometer; and SEM with EDX attachment. Both surfaces corroded in the order of electroless-nickel plated cast aluminium alloy (ENCA) < electroless-nickel plated as-received aluminium alloy (ENAA) at 0.0235 and 0.0251 rates (mg/mm2/y) results which showed improvement in the corrosion resistance with significant influence of electroless-nickel coating in reducing corrosion rates of aluminium alloy in brake oil.

show abstract

Effect of Processing Parameters on the Protective Quality of Electroless Nickel-Phosphorus on Cast Aluminium Alloy

Cited by 7 publications

References 29 publications

Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid

Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid

The Effect of Electroless Bath Parameters and Heat Treatment on the Properties of Ni-P and Ni-P-Cu Composite Coatings

Comparative effects of corrosion on electroless -nickel plated A6061 alloys in DOT3 brake fluid

Contact Info

Product

Resources

About