Corrosion Tests on aluminum alloys Alclad 3003, Alclad 3004, and bare 3004 and 5052 were conducted on various size tubing product using once through natural seawater. One test loop was used to determine the effects of mechanical and chemical cleaning on corrosion rates through the use of automatically timed brushing cycles and continuous chlorination. A second test loop had identical specimens placed upstream and downstream of a zinc anode coupled to a steel water box to determine if the zinc anode would reduce the corrosion rate of the downstream specimens. Specimens were exposed for 21 through 693 days.

Test results on specimens removed from the brush loops revealed that erosion occurred at both the high cycle (60/day) and low cycle (6/day) brushing frequencies in 150- to 250 days exposure. The zinc anode loop has not demonstrated that there is a significant beneficial effect on the downstream specimens.

Subject
Pits, Brushing, Materials, Zinc anodes, Corrosion testing, Corrosion loops, Seawater, Tubing, Wall thickness, Pitting, Zinc, Aluminum alloys, Cleaning
© 1982 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).
1982
Association for Materials Protection and Performance (AMPP)
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