A series of experiments involving exposure of partially submerged reinforced concrete specimens in natural sea water have been performed. Concrete mix design was altered for various specimen groups such that the influence of a water reducing agent and the concentration of calcium nitrite (up to 4 percent) upon time of the noble-to-active potential shift could be determined. For the purpose of assessing the role of chlorides upon the corrosion process local analysis was made for this ion in the various specimens. It was determined that the chloride level corresponding to the onset of active corrosion was greater than values reported for ponded slabs. Also, this threshold chloride concentration increased with increasing Ca(NO2)2 and was more than twice that for standard specimens (0% Ca(NO2)2) With addition of 2% inhibitor. The concentration of chlorides to cause corrosion was even greater with addition of Ca(NO2)2 Plus water reducing agent. The data and observations suggest that some factor or factors other than chloride ion concentration also influenced passivity breakdown.

Subject
Noble potential, Water, Active corrosion, Geometry, Chloride ion concentration, Trends, Rebar, Waterline, Specimen preparation, Corrosion inhibitors, Steel, Chlorides, Concrete
© 1981 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).
1981
Association for Materials Protection and Performance (AMPP)
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