This paper aimed to evaluate the corrosivity of water injected into an iron-ore slurry pipeline and propose a cost-effective water treatment to ensure pipeline integrity. The study was conducted by electrochemical techniques using water samples collected from a reservoir. The carbon steel specimens were extracted from a tube with a similar composition to thee pipeline (API 5L X80). Each water sample was used in its as-received condition and after the pH adjustment to 10.5, 11.0, 11.5, 12.0 and 12.5, with and without the addition of sodium sulfite as an oxygen scavenger. Linear polarization curves were obtained to estimate the corrosion rate, and anodic polarization curves were taken to evaluate the active/passive state. Immersion tests were conducted to get the corrosion rates. The study results show that the treatment with pH 12.0 or 12.5 without sodium sulfite is the most cost-effective treatment for industrial corrosion mitigation.

Subject
Immersion tests, Water, Materials, Slurry, Corrosion rate, Anodic polarization curves, Pipelines, Sulfites, Reservoirs, Polarization curves, Passivation, Oxygen, Polarization resistance
Keywords:
slurry pipeline, oxygen scavenger, water treatment, localized corrosion
© 2023 Association for Materials Protection and Performance (AMPP) and ABRACO. All rights reserved. This work is protected by both domestic and international copyright laws. 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 prior written permission. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP or ABRACO. Responsibility for the content of the work lies solely with the author(s).
2023
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.