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Electrodeposition of Cu-Zn-Sn coating in citrate medium

Yassine Salhi, Sghir Cherrouf, Mohammed Cherkaoui

Abstract


The electrodeposition of Cu-Zn-Sn (CZT) coating at ambient temperature was investigated. The bath consists of metal salts SnSO4, ZnSO4,7H2O and CuSO4,5H2O and sodium citrate (NaC6H5Na3O7,2H2O) as a complexing agent. For precipitation, the pH is maintained at 5. The reducing of copper, tin and zinc through Cu2HCit3−, Sncit2− and ZnHcit− complexes respectively are confirmed by the presence of three cathodic peaks on the voltammograms realized on steel and ITO glass substrate. X-ray diffraction patterns revealed peaks corresponding to the phases: Cu-Zn cubic, Cu-Sn hexagonal and β-Sn tetragonal. The deposition rate is 35 μm/h. SEM observation and EDAX analysis showed that the coating consists of a uniform CZT layer of which composition is 55% copper, 20% zinc and 25% tin at -1.5V.  A preliminary study showed a remarkable improvement in the corrosion resistance of CZT coated steel in comparison with bare steel.


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References


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DOI: http://dx.doi.org/10.13171/mjc9601071073ys

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