Surface characterization, mechanical properties and corrosion behaviour of ternary based ZneZnOeSiO2composite coating of mild steel
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Zinc coatings are obtained either from cyanide, non-cyanide alkaline or acid solutions. Because of the
pollution and high cost associated with cyanide, deposition from other baths is gaining importance. In
order to develop a bath with additive that could produce a quality coating is the motivation behind this
present work which is surface modification of Zne8ZnOeSiO2 nano composite coating on mild steel
surface by electrodeposition route. The influence of SiO2 on Zne8ZnO sulphate electrolyte on the
properties and microstructure of the produced nano-coatings were investigated. The SiO2 was varied
from 0 to 16wt%. The microstructure characteristics of these produced series composites coating were
investigated using scanning electron microscopy couple with energy dispersive spectroscopy (SEM/EDS),
X-ray diffraction and atomic force microscopy (AFM). The corrosion degradation properties in 3.65% NaCl
medium were studied using potentiodynamic polarization technique and characterized by high resolution
optical microscope (HR-OPM). The hardness and wear of the composite coating were measured
with high diamond microhardness tester and dry abrasive MTR-300 testers respectively. The results
showed that average hardness value of 142.5 and 251.2HV and corrosion rate of 0.13088 and
0.00122 mm/yr were obtained for the 0 and 16wt% SiO2 in Zne8ZnO. The work have established that
upto 16% SiO2 in Zne8ZnO composite coating on mild steel can be used in improving the microhardness,
wear loss and corrosion resistance of mild steel
Keywords
T Technology (General), TJ Mechanical engineering and machinery