The phenomenon of ripple in Direct Current(DC) Cathodic Protection (CP) circuits, resulting from the use of single phase Alternating Current (AC) rectifiers, is not well understood by most cathodic protection personnel. This paper discusses studies conducted in an attempt to verify the existence and magnitude of this ripple and differences in corrosion rates, if any, between filtered and unfiltered rectified DC current.

Subject
Cathodes, Electric current, Steel structures, Test methods, Water, Electrochemical cells, Voltage, Cathodic protection, Cathodic current, Rectifiers, Immersion, Corrosion resistance, Electrolytes
Keywords:
cathodic protection, (CP), wave form, Alternating Current, (AC), Direct Current, (DC), DC ripple, oscilloscope, rectifier
© 1998 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).
1998
Association for Materials Protection and Performance (AMPP)
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