Electrochemical impedance, weight loss and potentiodyne techniques were used to determine the corrosion rates of carbon steel along with the determination of activities of both sulphate-reducing bacteria (SRB) and acid-producing bacteria (APB) in a water injection field test facility.

Corrosion rates determined by the potentiodyne technique did not correlate with the bacterial activity. Corrosion rates obtained by electrochemical impedance spectroscopy (EIS) were comparable to the rates obtained by weight loss measurements. The average corrosion rates obtained by EIS paralleled the cumulative SRB activity over 84 days, and the addition of biocide resulted in reduced bacterial activity and corrosion rate.

The depression angles in Nyquist plots were high (30°, 29°) for control and biocide lines respectively indicating a fair degree of pitting corrosion. After 42 days, the values were lower, 11° for biocide line compared to 22° for control line showing the decrease in pitting tendency in line to which biocide was added at the end of 28 days

Subject
Electrochemical impedance spectroscopy, Water, Corrosion rate, Tubes, Impedance, Pitting corrosion rates, Bacterial activity, Impedance measurements, Weight loss analysis, Corrosion data, Pitting, Biocides, Samples
Keywords:
field studies, microbiological corrosion, potentiodyne, electrochemical impedance, biocide, water injection plant
© 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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