The effect of dissolved ozone on heat exchanger structural materials (carbon steel, stainless steel, copper and 70:30 copper nickel) has been studied in laboratory experiments, within the concentration range of 0.1 - 1.0 ppm. The biocidal efficacy of ozone on planktonic and sessile growth of Pseudomonas fluorescens was studied in quiescent and flow conditions. Ozone was able to kill the total number of planktonic bacteria in synthetic cooling water. However, ozone is only capable of inducing a partial reduction of bacterial numbers in the case of sessile bacteria.

The electrochemical behavior of copper and 70:30 copper nickel is studied through voltamperometric and corrosion potential vs. time measurements. Dissolved ozone would be able to modify the structure of the oxide layer. The electrochemical behavior of carbon steel and stainless steel in ozonated solutions of similar concentrations is also analyzed.

Subject
Scanning electron microscopy, Sessile bacteria, Ozone, Mixtures, Biofilms, Flow conditions, Metals, Copper nickel alloys, Carbon steel, Copper, Cooling water, Stainless steel, Corrosion potential
Keywords:
dissolved ozone, copper, 70:30 copper nickel, carbon steel, stainless steel, sessile bacteria, biofilms, extracellular polymeric substances, biocorrosion
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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