Journal
SURFACE AND INTERFACE ANALYSIS
Volume 46, Issue 1, Pages 1-6Publisher
WILEY-BLACKWELL
DOI: 10.1002/sia.5345
Keywords
coating; phosphating; sealer; tannin; surface
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Funding
- Brazilian government agency CNPq
- Microscopy Centre of the Pontifical Catholic University (PUC) of Rio Grande do Sul
- LACER from the Federal University of Rio Grande do Sul
- LACOR from the Federal University of Rio Grande do Sul
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This paper reports an investigation into the use of condensed black wattle tannin as an environmental friendly sealer after zinc phosphating of carbon steel. In order to verify the sealer efficiency against corrosion, electrochemical impedance spectroscopy, potentiodynamic polarisation and salt spray tests were performed. To verify the pore modifications and phase compositions, SEM, electron dispersive spectroscopy and X-ray diffraction analysis were carried out. The influence of the sealer on the adherence of finishing coatings was analysed. The results show that the tannin/sealer did not affect the final coating adhesion and improved the corrosion resistance of sealed samples. Copyright (c) 2013 John Wiley & Sons, Ltd.
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