The principal corrosion mechanisms for galvanized steel electric power utility transmission and distribution (T&D) structures (poles, lattice towers and anchor rods) are presented in this paper.

Several important factors often associated with corrosion ofgalvanized utility structures are deficiencies in corrosion control, improper coatings and not considering soil corrosivity conditions. In general, soil corrosivity, cathodic protection/coating, stray current, and copper grounding should be considered in corrosion mitigation and design of T&D structures. These factors are of primary consideration when accelerated corrosion attack occurs. If identified early on, potential failures can often be prevented. This paper includes a discussion on metallurgy of galvanized steel, soil corrosivity, T&D specific structural zones and system wide cathodic protection as a mitigation technique. This paper combines four past publications as well as presents new information and strategies for corrosion prevention for electric power utility T&D structures.

Subject
Steel structures, Substations, Zinc rich coatings, Corrosion rate, Soil resistivity, Galvanized coatings, Grounding, Galvanized steel, Steel, Towers, Corrosion protection, Zinc, Soil
Keywords:
Galvanized Steel Pole, Lattice Tower, Soil Corrosion, Corrosion Assessment, Corrosion Mitigation and Cathodic Protection (CP)
© 2016 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).
2016
Association for Materials Protection and Performance (AMPP)
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