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Corrosion resistance of zinc electrodeposited from acidic and alkaline electrolytes using pulse current

Matilda Zemanová

Institute of Inorganic Chemistry, Technology, and Materials, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia

 

E-mail: matilda.zemanova@stuba.sk

Received: 14 October 2008  Revised: 5 March 2009  Accepted: 16 March 2009

Abstract: Corrosion resistance of zinc coatings was investigated in an accelerated corrosion test in a condensation chamber. Zinc was electrodeposited from alkaline and acidic electrolytes using direct current (DC) or pulse current (PC). The zinc coating was subsequently protected against corrosion with a chrome (III) layer. Morphology and structure of the coatings was investigated using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction analysis (XRD) before and after the corrosion test. Corrosion resistance of alkaline zinc coatings electrodeposited with DC and PC under test conditions was found to be comparable. The corrosion resistance of zinc coatings deposited from acidic electrolytes by PC was lower in comparison with corrosion resistance of zinc coatings deposited using DC.

Keywords: zinc coating - pulse current - direct current - corrosion resistance

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-009-0051-5

 

Chemical Papers 63 (5) 574–578 (2009)

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