The electrochemical behaviour of the flame sprayed aluminium coating (FSA) exposed in natural sea water has been studied both at ambient and high temperatures in the laboratory. The tests have shown that F5A generally performs very well both in submerged and splash zone exposure. The prime effect of the FSA coating in sea water is as a very strong barrier type coating. The free corrosion potential of the FSA coating in strongly flowing sea water will be about -930 to -950 mV Ag/AgCl at ambient temperature. Here the use of a silicone sealer paint on the FSA coating will increase the service life of the system. An FSA coating with a silicone sealer paint will have some reduced anodic capabilities giving a current density output of about 30 to 200 mA/m2 in a potential range of -950 to 850 mV. For FSA coating without a sealer the current output can be up to about 500 mA/m2 in an initial exposure period. However, at a high, constant current density the Al-coating will be consumed during a few months exposure. These laboratory test data are compared with the performance data from the Hutton TLP platform.

Subject
Risers, Water, Coatings, Vinyls, Free corrosion potential, Splash zone, Steel, Sealers, Silicone sealers, Coating defects, Corrosion protection, Blistering, Barrier coatings
© 1987 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).
1987
Association for Materials Protection and Performance (AMPP)
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