Effect of Mean Diameter Size of Disperse Phase on Morphology and Corrosion Resistance of Phenol – Formaldehyde Resin/Zn Coatings

  • Alina CIUBOTARIU "Dunarea de Jos" University of Galati, Romania
  • Lidia BENEA "Dunarea de Jos" University of Galati, Romania
  • Pierre PONTHIAUX Ecole Centrale Paris, France
Keywords: phenol - formaldehyde resin particles, electrodeposition, coatings, coatings morphology, polarisation resistance

Abstract

The present work has the purpose of obtaining composite coatings using phenol – formaldehyde (PF) resin electrodeposited with zinc. The phenol – formaldehyde resin/Zn coatings were electrodeposited from a suspension of PF resin particles with two dimensions for mean diameter size of particles (0.1-5.0 μm and 6-10 μm) in aqueous zinc sulphate electrolyte. Suspension was prepared by adding 10 g/L PF resin particles into solution. The thickness and morphology of the coatings were investigated by SEM method. By adding PF resin in zinc electrolyte for electrodepositing we obtained a very good distribution of PF resin particles on zinc surface. The electrochemical behavior of the layers in the corrosive solution was investigated by electrochemical methods. As electrochemical test solution 0.5 M sodium chloride was used in a three electrode open cell. It was observed that by adding PF resin particles in zinc electrolyte for electrodeposition 
were obtained composite layers more resistant to corrosive attack of 0.5 M NaCl than pure zinc obtained from electrodeposition at the same parameters for electrodeposition. Corrosion rate for pure zinc coatings was 72.05 µm/year versus 15.34 µm/year for coatings with mean diameter size of particles 0.1-5.0 μm, respectively 10.11 µm/year for coatings with mean diameter size of particles 6-10μm. Values of polarization resistance obtained with both electrochemical methods (potentiodynamic polarization and electrochemical impedance spectroscopy) were in a very good agreement.

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Published
2013-09-15
How to Cite
1.
CIUBOTARIU A, BENEA L, PONTHIAUX P. Effect of Mean Diameter Size of Disperse Phase on Morphology and Corrosion Resistance of Phenol – Formaldehyde Resin/Zn Coatings. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science [Internet]. 15Sep.2013 [cited 29Mar.2024];36(3):78-3. Available from: https://www.gup.ugal.ro/ugaljournals/index.php/mms/article/view/2749
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