51316-7448-Influence of Deposition Parameters on Corrosion Protection Properties of Electrophoretic Acrylic Paints

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Product Number: 51316-7448-SG

ISBN: 7448 2016 CP

Author: Stefano Rossi

Publication Date: 2016

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In the early 90’s few strict environmental protection regulations boosted the developments and the uses of water based paint technologies for anticorrosion protection of metals. The present study shows an investigation on the anticorrosive and aesthetic properties of steel coated with a waterborne acrylic coating in presence of four diverse colour pigments. The coatings were applied onto cold rolled mild steel from Q-Panel via cathodic deposition. The film thicknesses were approximately in the order of 20 µm and initial observations of the clear coats have shown good adhesion values due to the chemical pre-treatment of steel surface before the cathodic deposition in the order of 5.0 MPa. Along the lines of this investigation the evaluation of the anticorrosive properties of the paint systems has been primarily conducted via Electrochemical Impedance Spectroscopy (EIS). To start with the clear coats have shown a quasi-capacitive behaviour with the magnitudes of the total impedance at low frequency range in the order of 1011 Ohm.cm2 for over 360 hours of exposure to the chloride solution. Further the steel coated panels were exposed in the accelerated salt spray and U.V. chambers. The influence of the presence of colour pigments with different concentrations has been evaluated prior and after the exposition considering the corrosion protection properties and appearance one (colour and gloss change).