The paper reports about the results of laboratory investigations on edges prepared with different tools and painted with different coating systems for applications in water ballast tanks. The laboratory test scenarios were already described in a presentation delivered at PACE 2010, and this paper is the second part of that presentation. The results of the first part of the study can be summarised as follows (1):

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    Edge preparation tool, edge geometry (radius) and paint system had all notable effects on the corrosion protection performance of the protective coating systems.

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    The assessment methods used in the study allowed for a differentiation between the above mentioned influencing effects.

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    There were correlations between the assessment results obtained from geometry and results obtained from corrosion protection.

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    There were relationships between the edge radius and the corrosion protection performance of the systems.

This second part can be summarized as follows. Electrochemical impedance spectroscopy measurements helped to identify the initiation of failure at the edge, which was mainly due to the sudden formation of localized defects. The tests performed in a wave chamber were useful for the further observation of paint deterioration and corrosion. Results were statistically interpreted, and it was found that edge radius had a negligible effect on dry film thickness, whereas rounding tool and paint system had notable effects. The latter two parameters had also significant effects on paint deterioration and corrosion at edges. Paint application is another important factor.

Subject
Coating performance, Coating application, Protective coatings, Coatings, Materials, Geometry, Tools, Lasers, Dry film thickness, Organic coatings, Corrosion protection, Deterioration, Coating systems
© 2011 Association for Materials Protection and Performance (AMPP). All rights reserved. This work is protected by both domestic and international copyright laws. 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).
2011
Association for Materials Protection and Performance (AMPP)
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