Authors: Sulcius, A.¹; Griskonis, E.²; Diaz-Arista, P.³; Trejo, G.³

Source: Transactions of the Institute of Metal Finishing, Volume 87, Number 5, September 2009 , pp. 254-258(5)

Publisher: Maney Publishing

Abstract:

The influence of thiourea (TU, 0·5 g L⁻¹) and additive mixture of ammonium selenate and thiourea (AS–TU, 0·5 g L⁻¹) on electrodeposition of Zn–Mn alloy coatings from sulphate–citrate bath (SCB) has been studied. Investigations of alloy composition were carried out by atomic absorption spectroscopy and inductively coupled plasma. A profile of the relative concentration of sulphur was obtained using glow discharge spectroscopy. The morphology of the coatings was studied by scanning electron microscopy. The crystal structure was investigated by X-ray diffraction. Two phases (metastable ε and β) were detected in coatings electrodeposited from SCB with TU and mixture of AS–TU at j _c≥10 A dm⁻² (≥50%Mn). Zn–Mn alloy coatings, electrodeposited from an SCB with 0·5 g L⁻¹ TU were harder than coatings electrodeposited from SCB with AS alone, and a mixture of AS–TU. Coatings electrodeposited from SCB with a mixture of AS–TU had the lowest tensile stress.

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/002029609X12483598222682

Affiliations: 1: Department of General Chemistry, Kaunas University of Technology, Radvilenu pl. 19, LT-50254, Kaunas, Lithuania 2: Department of General Chemistry, Kaunas University of Technology, Radvilenu pl. 19, LT-50254, Kaunas, Lithuania; Institute of Physical Electronics of Kaunas University of Technology, Department of Development and Implementation, Savanoriu pr. 271, LT-50131, Kaunas, Lithuania 3: Centro de Investigacion Desarrollo Tecnologico en Electroquimica (CIDETEQ), Parque Tecnologico Sanfandila, Pedro Escobedo, Queretaro, A.P. 064, C.P. 76700, Queretaro, Mexico

Publication date: 2009-09-01

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