This paper reports the development and application of a novel test method for evaluating corrosion inhibitors under erosion-corrosion conditions.

A rotating coupon is spun at high speed in a high weight percent sand slurry for a duration of 20 hours. The chosen conditions of the test determine the applicable wear modes and from gravimetric analysis a metal loss rate can be calculated.

The test method has demonstrated that all three control conditions; erosion, corrosion and erosion-corrosion can be created in the laboratory and that when testing under the erosion-corrosion conditions the synergy, as reported in the field, is present.

Using the control results it has been possible to treat the system with commercial corrosion inhibitors and to evaluate the performance of said chemicals against erosion-corrosion. At treat rates of 1000 parts per million (ppm) protection levels have exceeded 96%, at levels of 250 ppm inhibitor significant protection is still maintained in the order of ~93%. Initial studies of reducing the treat rate further indicates that at levels <100 ppm protection can be achieved.

The rotating coupon results have been supported by optical microscopy and the use of a laser surface profilometer (LSP). A field trial is now the final step for confirming the test method inferences.

Subject
Test methods, Inhibitor performance, Sand, Corrosion rate, Profilometry, Metal loss, Corrosion inhibitors, Lasers, Erosion, Pitting, Corrosion protection, Corrosion coupons, Erosion corrosion
Keywords:
Erosion-corrosion, corrosion inhibitor, synergy, inhibition performance, sand
© 2008 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).
2008
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.