Modern anti-corrosion tank coatings are complex polymeric systems which are expected to provide corrosion protection after portage of many types of strong chemical and solvent cargos. Longevity of the applied coaling system is a function of the characteristics and quality of the formulated coating as well as the physical application. A tank coating testing program has been developed to evaluate specific failure modes with troublesome representative solvents frequently traded in large multi-tank marine vessels. Methanol, benzene, acetone, ethylene dichloride, vinyl and ethyl acetate, methyl isobutyl ketone, and 2-ethylhexyl acrylate as well as hot crude tall oil have been used as test cargos to evaluate candidate tank linings. The evaluation techniques utilize monitoring cargo absorption and desorption rates as a function of coating weight followed by gas chromatography/mass spectroscopy (GC/MS) of the test solutions to identify extracted coating materials released into the solvent cargos. Solvent retention in the lining is followed by GC/MS of coating chips with known exposure histories. Failure modes are demonstrated and mechanisms are proposed.

Subject
Acids, Test methods, Zinc rich coatings, Water, Coatings, Materials, Solvents, Desorption, Epoxy coatings, Tank linings, Immersion, Methanol, Blistering
Keywords:
Tank lining, marine, coating failure analysis, test procedures, coating evaluation, GC/MS
© 1996 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).
1996
Association for Materials Protection and Performance (AMPP)
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