Experiments have been performed where cylindrical 1018 steel specimens were polarized to -0.900v. (SCE) in natural seawater at 24 and 3°C and with rotation speeds of 0 and 0.83 Hz. The nature of the calcareous deposits which formed was characterized, first, by monitoring current density during the experiments and, second, by post-test SEM investigation of deposit morphology and thickness and by EEDS analysis of deposit composition. The dependence of cathodic current density and film composition upon temperature and exposure time has been established, and the observed trends have been interpreted in terms of 1) the temperature dependence of the solubility limit and relative nucleation and growth rates for the calcium and magnesium rich phases and 2) possible electrical conductive behavior on the part of magnesium rich deposits.

Subject
Water, Composition, Cathodic protection, Corrosion rate, Seawater, Current densities, Cathodic current density, Scale formation, Steel, Magnesium, Oxygen, Deposit corrosion, Calcareous deposits
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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