"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Influence of particles size on the morphology and corrosion behaviour of phenol – formaldehyde/Zn composite coatings obtained by electrodeposition

A.–C. CIUBOTARIU1,2,* , L. BENEA1,2, O. MITOŞERIU1, P. PONTHIAUX3, F. WENGER3

Affiliation

  1. Dunarea de Jos, University of Galati, Romania
  2. Metallurgy and Materials Science Faculty, 47 Domneasca Street, 80008, GALATI, Romania
  3. Ecole Centrale Paris, Laboratoire Génie de Procédées Matériaux, Grand Voie des Vignes, 92290 Chatenay Malabry, France

Abstract

The present work has the purpose of studying the structure and corrosion behaviour of composite coatings having zinc as matrix, and phenol – formaldehyde resin type Novolac (RESITAL 6358/1) as dispersed phase obtained during electrodeposition process of zinc. The phenol – formaldehyde resin/Zn composite coatings were electrodeposited from a suspension of phenol – formaldehyde resin particles in aqueous zinc sulphate electrolyte by adding 10g/L of phenol – formaldehyde resin particles in the electrolyte solution. Two dimensions of dispersed particles were used: 0.1 - 5μm and 6 - 10μm respectively. The surface morphologies of the coatings were investigated by scanning electron microscopy (SEM – EDS) and atomic force microscopy (AFM) methods. The pure zinc coating has a rather regular surface, whereas the composite coating surfaces have finer grains and different morphologies. The electrochemical behaviour of the coatings in the corrosive solutions was investigated by electrochemical impedance spectroscopy (EIS) method. As electrochemical test solution 0.5M sodium chloride was used in a three electrode open cell. The corrosion potential is shifted to more negative values for composite coatings than that of pure zinc coating. The polarization resistances of phenol – formaldehyde resin/Zn composite coatings are bigger than that of pure zinc coating obtained in the same condition for electrodeposition..

Keywords

Phenol – formaldehyde resin/Zn composite coatings, Electrodeposition, Scanning electron microscopy, Atomic force microscopy, Electrochemical impedance spectroscopy, Polarization resistance, Corrosion current.

Submitted at: March 2, 2009
Accepted at: June 28, 2009

Citation

A.–C. CIUBOTARIU, L. BENEA, O. MITOŞERIU, P. PONTHIAUX, F. WENGER, Influence of particles size on the morphology and corrosion behaviour of phenol – formaldehyde/Zn composite coatings obtained by electrodeposition, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 6, pp. 892-897 (2009)