Structural and properties of Zn-Al2O3-SiC nano-composite coatings by direct electrolytic process
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Springer-Verlag London
Abstract
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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.
Keywords
T Technology (General), TJ Mechanical engineering and machinery