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- Title
EVALUATION OF PHOSPHATE COATING AS A BASE FOR NICKEL ELECTRODEPOSITION ON PLAIN CARBON STEEL SUBSTRATE.
- Authors
OLORUNTOBA, D. T.; FABUYIDE, A. A.
- Abstract
Zinc phosphate as a pre-treatment operation was evaluated for electrodepositions of nickel on plain carbon steel substrate. Phosphate zinc bath was formulated using zinc oxide (ZnO), phosphoric acid (H3PO4), nitric acid (HNO3), sodium nitrate (NaNO3), distilled water (H2O), and iron wool. Phosphating operations were carried out at temperature ranges of 85° C to 95° C at varied concentrations of phosphoric acid for 20 to 60 minutes. Nickel was electrodeposited on the phosphate and on as received steel substrates at 3 Volts for 30 minutes. The samples were later exposed to atmospheric air at room temperature for over 150 days. Metallurgical microscope was used to study the film adhesion and continuity as the parameters for assessing the quality of nickel electrodeposited on the phosphatized substrates. The result obtained showed that the nickel film well adhere to the phosphatized sample. It is seen that the nickel film of the sample without prior phosphate peel-off while the films of samples phosphate before nickel electroplating remained well adhered. Zinc phosphate could serve as an alternative to copper cyanide bath as pretreatment for nickel electrodeposition on plain carbon steel with improved adhesion.
- Publication
Annals of the Faculty of Engineering Hunedoara - International Journal of Engineering, 2015, Vol 13, Issue 3, p59
- ISSN
1584-2665
- Publication type
Academic Journal