Potentiostatic ICCP is a closed loop Control system at the reference electrode (RE). A preliminary study of the identification of a ship system has been carried out employing a stylised, physical scale model of a hull fitted with an All-aft single-zone ICCP configuration in static electrolyte. Time responses at the RE after initial switch on were examined in relation to a step input to a Set Potential of -800 mV and further increments to -850 and -900 mV. The closed loop transfer function while the Set Potential was being established was found to be at least Second Order, with a low damping ratio. The present study employed a model hull with two components - bare steel and a bronze propeller. It is evident that the characteristics of the transfer function will depend upon the nature of the hull and its coating, type of ICCP system fitted and the operational conditions. The difficulties in producing a generic transfer function are discussed.

Subject
Electric current, Steel structures, Propellers, Impressed current cathodic protection, Seawater, Bronze, Hull, Scale, Marine vessels, Electrochemical potential, Step potential, Electrode potential, Anodes
Keywords:
ships, cathodic protection, impressed current, control systems, system identification, transfer functions, modelling
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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