Real-time coupled multielectrode array sensor probes were used to measure the maximum localized corrosion rate of Type 1008 carbon steel; Types 1100 and 3003 aluminum; Type 110 copper; and Types 316L, 304L, 904L, and 254 SMO stainless steels in simulated seawater. The real-time general corrosion rates and general corrosion penetration depth for selected alloys were also given, based on the average anodic currents and average anodic charge from the coupled multielectrode array sensor probes. Detailed analyses, for deriving the general corrosion penetration rate and general corrosion penetration depth using the average anodic currents and average anodic charges, were described. Localized corrosion penetration rate factor and localized corrosion penetration depth factor were also discussed.

The maximum localized penetration rates for the stainless steels tested were between 0.5 μm/yr (0.02 mil/yr) and 10 μm/yr (0.4 mil/yr). The maximum localized penetration rate for copper 110 was between 8 μm/yr (0.32 mil/yr) to 90 μm/yr (3.5 mil/yr). The maximum localized penetration rate for aluminum 1100 and 3003 was between 70 μm/yr (2.8 mil/yr) and 1000 μm/yr (40 mil/yr). The maximum localized penetration rate for carbon steel 1008 (mainly pitting corrosion) was between 800 μm/yr (32 mil/yr) and 4000 μm/yr (157 mil/yr).

Subject
Corrosion rate, Probes, Maximum localized corrosion, Simulated seawater, Average corrosion rates, General corrosion rate, Penetration, Corrosion probes, Pitting, Localized corrosion, Stainless steel, Electrodes, Corrosion potential
Keywords:
Corrosion monitoring, marine corrosion, corrosion sensor, localized corrosion, online corrosion sensor, corrosion probe, real-time corrosion sensor, multielectrode sensor, coupled multiple electrodes, general corrosion rate
© 2006 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).
2006
Association for Materials Protection and Performance (AMPP)
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