The potential of tannic acid as a protective agent against steel corrosion was studied. Research was carried out on steel sheets rusted in an unpolluted inland atmosphere. Different experimental techniques such as x-ray photoelectron spectroscopy, others involving climatic chamber tests and various electrochemical variants (polarization curves, zero-resistance ammeter measurements and electrochemical impedance spectroscopy) were applied. Treatment of rust with tannic acid seemingly brought about no significant improvement in the protective features of the corrosion products formed outdoors.

Subject
Acids, X-ray diffraction, Steel surfaces, Ions, Sodium sulfate, Solubility, Polarization curves, Corrosion products, Film formation, Steel, Rust, Corrosion protection, Paints
Keywords:
rust conversion coatings, tannic acid, electrochemical tests, X-ray photoelectron spectroscopy (XPS), climatic chambers
© 1991 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1991
Association for Materials Protection and Performance (AMPP)
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