Mexico is celebrating two hundred years of independence and in commemoration; the Mexican government is building an iconic monument in the most important avenue in Mexico City. The Estela de Luz monument, which is set to last 200 years free of corrosion while serving as a reminder to the Mexican people of their struggle for independence, is already facing its first challenge. The artist and architects designed the structure using two different metals: Stainless Steel and Carbon Steel, therefore generating a galvanic pair which, if not mitigated, will induce a shortening of the life span of the structure. A combined solution using coatings and a hybrid cathodic protection system was proposed for the structure in order to minimize the net corrosion current.

Numerical modeling and analytical calculations are presented demonstrating the effectiveness of a hybrid cathodic protection system using galvanic pairs and an impressed. Current system. In addition, laboratory tests were performed for the study of the stainless steel - carbon steel galvanic pair embedded in concrete, and for a comparison of the performance of different coatings. The design of a corrosion monitoring system is also presented.

Subject
Steel structures, Coatings, Galvanic anodes, Cathodic protection, Corrosion currents, Corrosion detection, Anchors, Carbon steel, Impressed current, Stainless steel, Protection potential, Corrosion potential, Concrete
Keywords:
Cathodic protection systems, concrete corrosion, galvanic corrosion
© 2012 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).
2012
Association for Materials Protection and Performance (AMPP)
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