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Structural and properties of Zn-Al2O3-SiC nano-composite coatings by direct electrolytic process

Fayomi, O. S. I and Popoola, A. P. I. and Olorunniwo, O. E. (2016) Structural and properties of Zn-Al2O3-SiC nano-composite coatings by direct electrolytic process. Int J Adv Manuf Technol. ISSN 0268-3768

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In this paper, Zn-SiC and Zn-Al2O3-SiC composite coating were fabricated by electrodeposition technique from sulfates bath. The resulting composite coating was carried out by adding Al2O3/SiC particulate to a zinc-containing bath. The properties of the composite coating were investigated by SEM equipped with EDS, XRD, and AFM. The electrochemical behavior of the coating alloy was evaluated in 3.65 % NaCl with linear polarization technique and mechanically examined by durascan microhardness tester. The morphology of the thermal treated coatings at 400 °C in 6 h was viewed with high optical microscope (OPM). The results show hardness, thermal stability, and anti-corrosion properties of Zn-Al2O3-SiC were improved significantly as against Zn- SiC coating matrixes. This was attributed to dispersive strengthening effect and grain induced effort of Al2O3/SiC particulate. The decrease in corrosion and thermal stability at 15 g/L of SiC concentration may be as a result of agglomeration and the superimposed particle in the plating bath.

Item Type: Article
Uncontrolled Keywords: Microstructure . Zn-Al2O3-SiC . Micro-hardness . Interfacial effect . Thermal stability
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 26 Sep 2017 12:23
Last Modified: 26 Sep 2017 12:23

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