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Effect of Current Density on the Microstructure and Adhesion of Ni-Co/Al2O3 Composite Coatings

Published online by Cambridge University Press:  04 July 2016

Diana Alejo-Guerra ,
Carlos A. León-Patiño ,
Ena A. Aguilar-Reyes  and
José E. Bedolla-Becerril
Diana Alejo-Guerra
Affiliation:
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Av. Francisco J. Múgica S/N Ciudad Universitaria, Morelia, Michoacán, C.P. 58030, México.
Carlos A. León-Patiño
Affiliation:
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Av. Francisco J. Múgica S/N Ciudad Universitaria, Morelia, Michoacán, C.P. 58030, México.
Ena A. Aguilar-Reyes
Affiliation:
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Av. Francisco J. Múgica S/N Ciudad Universitaria, Morelia, Michoacán, C.P. 58030, México.
José E. Bedolla-Becerril
Affiliation:
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Av. Francisco J. Múgica S/N Ciudad Universitaria, Morelia, Michoacán, C.P. 58030, México.
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Abstract

Ni-Co/Al2O3 composites with alumina particles below 0.53 µm in size were electrochemically deposited on carbon steel AISI-O1 substrates. The influence of current density (2, 3, 4 and 5 mA/cm2) on the microstructure and adhesion behavior was investigated. It was found that the micro-hardness of the surface increased in 90% with respect to the plain substrate. SEM examination revealed an increased thickness from 3.7 to 10.7 µm at current density of 2 and 5 mA/cm2, respectively. The Co/Ni weight ratio in the coatings was determined by atomic absorption spectroscopy (AAS); the content of Co and Ni at 2 mA/cm2 were 42.4 %Co and 57.6 %Ni, while at 5 mA/cm2 were 44.5%Co and 55.5%Ni. The adhesion of the coatings was evaluated qualitatively according to the VDI 3198 norm; in all the cases, the adhesion was more than acceptable since no cracks or detachments were observed in the periphery of the marks. Details on the synthesis and properties of the Ni-Co/Al2O3 composite coatings are presented together with the excellent properties they show despite of their thin thickness.

Keywords

ElectrodepositionAdhesionCoating
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1820: Symposium 6D – Innovative production and application of structural and functional ceramic- and metal-matrix composites , 2016 , imrc2015s6d-0004
Copyright
Copyright © Materials Research Society 2016 

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References

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