External corrosion of underslab, copper, hot water tubing has resulted in a great deal of construction defect litigation. In some cases, failures have been attributed to thermogalvanic corrosion between adjacent hot and cold copper tubing. This paper presents and discusses field and laboratory data gathered on thermogalvanic corrosion of underslab copper tubing. Field data include changes in pipe to soil potentials with increase in temperature, cathodic protection current requirement testing and the effectiveness of polyvinyl sleeving for corrosion control. Laboratory data on thermogalvanic corrosion cells in soil/water systems and 3% sodium chloride are also presented and discussed.

Subject
Costs, Corrosion failures, Water, Slurry, Cathodic protection, Pipe to soil potential, Leaks, Sodium chloride solution, Tubing, Copper, Electrodes, Soil, Thermogalvanic corrosion
Keywords:
Thermogalvanic, copper, hot water, underground, underslab, corrosion, soil
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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