Study on wear and corrosion properties of functionally graded nickel–cobalt–(Al2O3) coatings produced by pulse electrodeposition

Functionally graded nickel–cobalt coatings with/without alumina nanoparticles were pulse electrodeposited on a carbon steel substrate by a continuous decrease in duty cycle from 95 to 10% at different frequencies of 100, 500 and 1000 Hz. The effect of pulse parameters on the nanoparticle content, ch...

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Bibliographic Details
Published in:Bulletin of materials science 2019-04, Vol.42 (2), p.53, Article 53
Main Authors: Karimzadeh, A, Aliofkhazraei, M, Rouhaghdam, A S
Format: Article
Language:English
Subjects:
Alumina
Aluminum oxide
Carbon steel
Carbon steels
Chemical composition
Chemistry and Materials Science
Cobalt
Corrosion effects
Corrosion resistance
Corrosion tests
Corrosive wear
Electrodeposition
Engineering
Materials Science
Mechanical properties
Nanocomposites
Nanoparticles
Nickel
Plating
Protective coatings
Scanning electron microscopy
Substrates
Temperature
Tribology
Wear resistance
Wear tests
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Summary:Functionally graded nickel–cobalt coatings with/without alumina nanoparticles were pulse electrodeposited on a carbon steel substrate by a continuous decrease in duty cycle from 95 to 10% at different frequencies of 100, 500 and 1000 Hz. The effect of pulse parameters on the nanoparticle content, chemical composition, microstructure, corrosion properties and tribological behaviour of coatings was studied. Energy-dispersive X-ray spectroscopy analysis showed that the amount of cobalt is gradually reduced and the content of alumina nanoparticles is increased from the substrate/coating interface to the surface. Based on the electrochemical studies in 3.5 wt% NaCl, the nanocomposite coatings gain the highest corrosion resistance at the lowest frequency. Also, the hardness of coatings gradually increased. Evaluation of the tribological behaviour of coatings by a pin-on-disk wear test showed that the nanoparticles have a positive effect on wear resistance and improve it by increasing frequency.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-018-1715-y