Influence of ammonium selenate and thiourea mixture on mechanical properties and morphology of Zn-Mn alloy coatings electrodeposited from sulphate-citrate bath

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

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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 jc≥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: 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 3: Centro de Investigacion Desarrollo Tecnologico en Electroquimica (CIDETEQ), Parque Tecnologico Sanfandila, Pedro Escobedo, Queretaro, A.P. 064, C.P. 76700, Queretaro, Mexico

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