Electrodeposition Obtaining and Corrosion Behaviour of Phenol Formaldehyde Resin/Zinc Composite Coatings
Journal Title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor - Year 2008, Vol 31, Issue 2
Abstract
The present work has the purpose of obtaining composite coatings in zinc matrix by using phenol - formaldehyde resin type NOVOLAC (RESITAL 6358/1) in the electrodeposition process of zinc. The PF resin/Zn composite coatings were electrodeposited from a suspension of PF resin particles (diameter < 56 μm) in aqueous zinc sulphate electrolyte. Suspension was prepared by adding 10 g/L and 25 g/L PF resin particles into solution. The pure zinc coating has a rather regular surface, whereas the composite coatings surface has fine surface structure. For layers obtained at 3A/dm2 the polarization resistance is higher for composite coatings with 10 g/L PF resin (Rp = 238.75 Ω cm2 ) than pure zinc (Rp = 34.54 Ω cm2). For layers obtained at 5A/dm2 the polarization resistance is higher for composite coatings with 25 g/L PF resin (Rp = 430.19 Ω cm2) than pure zinc (Rp = 127.34Ω cm2). As test solution 0.5M sodium chloride was used, it was observed that by adding PF resin particles in zinc electrolyte for electrodeposition it was obtained a very good distribution of resin particles on zinc surface and PF resin/Zn composite coatings obtained are most resistant at corrosive attack than pure zinc obtained from electrodeposition under the same conditions.
Authors and Affiliations
Olga MITOŞERIU, Alina CIUBOTARIU, Lidia BENEA, Pierre PONTHIAUX, Francois WENGER
Keywords
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