Zinc coatings of high hardness on steel by electrodeposition from glutamate complex baths

Ibrahim, Magdy, R. S. Bakdash,

Abstract


The effect of monosodium glutamate (MSG) on zinc electrodeposition from acidic sulphate plating
baths was investigated using potentiodynamic cathodic polarisation, cyclic voltammetry,
cathodic current efficiency and throwing power measurements, current–time transients and insitu
anodic linear stripping voltammetry techniques, complemented with X-ray diffraction analysis
and SEM measurements. Addition of MSG increases the hardness of zinc deposits by a factor of
3. Kinetic parameters such as Tafel slope, transfer coefficient and exchange current density
obtained from Tafel plots, indicated that MSG had a pronounced accelerating effect on the zinc
deposition process. From the voltammetric data obtained in the presence of MSG, it is clear that
the overpotential of zinc deposition is significantly decreased. Chronoamperometry measurement
suggested that the growth of zinc metal is a diffusion-controlled process. X-ray diffraction analysis
and SEM observations revealed that MSG does not change the crystal structure of the
electrodeposited zinc but strongly affected the crystallographic orientation of the crystal planes.


Other data

Title Zinc coatings of high hardness on steel by electrodeposition from glutamate complex baths
Authors Ibrahim, Magdy ; R. S. Bakdash 
Keywords Zinc deposition, Cyclic voltammetry, Polarisation curves, Monosodium glutamate, Chronoamperometry, Anodic stripping
Issue Date 2-Jul-2014
Publisher Taylor & Francis
Journal Transactions of the IMF 
URI http://research.asu.edu.eg/handle/123456789/168997
DOI http://dx.doi.org/10.1179/0020296714Z.000000000184

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