Potential of Composite Incorporation on the Mechanical Behavior of Multilayer Coatings
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In this paper, the performance of a composite particle for the deposition of ZnO/Cr2O3
on a zinc electrolyte was examined. Its susceptibility to corrosion in 3.5% NaCl, using
linear polarization, was investigated. The developed crystal was characterized by using
scanning electron microscope (SEM) equipped with an energy dispersive spectrometer
(EDS). The strengthening properties of the coated samples, i.e. the mechanical
response, were studied using a high sensitive diamond microhardness indenter and a
MTR-300 rigid wear tester. From the results, the effect of the composite coatings
interestingly influenced the performance regarding microhardness, durability, corrosion
mitigation and wear damage. In general, the micro-hardness value for the Zn-ZnO
material was 125.0 HVN, while it was 130.5 HVN for Zn-8ZnO-16Cr2O3 composite
coating. For Zn-8ZnO-20Cr2O3, a better hardness performance was noted with 138.0
HVN. From the wear study, Zn-8ZnO shows 0.018 g/min dissociation against the
counter body with the best wear performance obtained at 0.005 g/min. The corrosion
properties of the developed composite coating also tend towards a more positive region,
with a corrosion rate of 0.850 mm/yr. This shows that the role of composite particulates
maximally contributes to improve the strengthening characteristics of the developed
coating.
Keywords
TJ Mechanical engineering and machinery, TP Chemical technology