Electrochemical study of different ageing tests for the evaluation of a cataphoretic epoxy primer on aluminium

• Published in: Progress in organic coatings Vol. 54; no. 1; pp. 55 - 62
• Main Authors: Poelman, M., Olivier, M.-G., Gayarre, N., Petitjean, J.-P.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.09.2005; Elsevier Sequoia
• Subjects: Ageing; Applied sciences; Cataphoretic primer; Coatings. Paints, varnishes and inks; Corrosion; Corrosion mechanisms; EIS; Exact sciences and technology; Film formation and curing, properties, testing; Metals. Metallurgy; Organic coating; Polymer industry, paints, wood; Uses; Cataphoretic primer; Corrosion; Ageing; EIS; Organic coating; Scratching test; Polarization; Primer; Immersion; Coatings; Bode diagram; Degradation; Time dependence; Cataphoresis; Defect; Charge transfer; Salt spray test; Aluminium; Experimental study; Corrosion resistance; Epoxide; Automobile industry; Equivalent circuit; Capacitance; Transfer resistance; Electrochemical impedance spectroscopy
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2005.04.004

Different ageing tests (salt spray of intact and scratched samples, immersion) were used for the evaluation of the corrosion resistance of a lead-free epoxy primer used in the automotive industry and cataphoretically deposited on pre-treated aluminium 6016. The evaluation of the degree of degradation was carried out by electrochemical impedance spectroscopy. These tests were compared to accelerated degradation obtained by means of a test combining ac and dc polarizations.