Characteristics of electrodeposited cobalt and titania nano-reinforced cobalt composite coatings

Nano-crystalline Co and Co/TiO2 nano-composite coatings were electrodeposited from cobalt sulfate based solutions. Effect of electrolyte pH and nano-particles concentrations on the deposition rate, microstructure, morphology and hardness of the coatings were investigated. Tribological behavior of pu...

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Bibliographic Details
Published in:Surface & coatings technology 2013-10, Vol.232, p.198-203
Main Authors: Mahdavi, S., Allahkaram, S.R.
Format: Article
Language:English
Subjects:
Applied sciences
Austenitic stainless steels
Co/TiO2 nano-composite
Coatings
Cobalt
Cross-disciplinary physics: materials science
rheology
Deposition
Electrodeposition
Exact sciences and technology
Friction
Heat resistant steels
Materials science
Metallic coatings
Metals. Metallurgy
Nanostructure
Physics
Preferred orientation
Production techniques
Surface treatment
Surface treatments
Titanium dioxide
Tribological behavior
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Summary:Nano-crystalline Co and Co/TiO2 nano-composite coatings were electrodeposited from cobalt sulfate based solutions. Effect of electrolyte pH and nano-particles concentrations on the deposition rate, microstructure, morphology and hardness of the coatings were investigated. Tribological behavior of pure Co and Co/TiO2 coatings was studied and the results were compared with the substrate (316L). The results indicated that, deposition rate and grain size were increased by increasing of pH, while microhardness was decreased. Preferred orientation was also changed from mostly [001] at low pH to [100] at high pH values. Nano-composite coating with 3.6vol.% TiO2 particles, deposited in a bath containing 20gL−1 TiO2, had the highest hardness value and wear resistance as compared to the other samples. Volume loss of this coating was about 5 and 33 times lower than the nano-crystalline pure cobalt and 316L SS substrate, respectively. However, pure cobalt coating had the lowest friction coefficient between all samples. •Influence of bath pH on deposition rate and microhardness•Influence of pH on the coatings texture, morphology, and grain size•Influence of TiO2 particles additions on optimum amount of reinforcing particles•Effect of TiO2 particles addition on coatings morphology and hardness•Comparison of tribological behavior of Co and Co/TiO2 coatings with 316L substrate
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2013.05.007