The corrosive effects of iron monosulfide particles deposited on carbon steel surfaces were investigated in a series of autoclave experiments. The H2S and CO2 partial pressures were varied in the range of 1-20 bar. Experiments were run at temperatures in the range of 10-120 °C. The test solutions consisted of high-salinity brine (100 g/L NaCl, 0.0025 m bicarbonate) and low-salinity condensed water (0.1 g/L NaCl). The duration of the tests was typically 14 days. Both weight loss corrosion and localized corrosion data were obtained. The entire surfaces of the exposed coupons were scanned with a 3D profilometer, obtaining detailed data on localized corrosion morphology, pit frequency and pit depths. The presence of FeS deposits was found to significantly increase both weight loss and local penetration rates in experiments with high H2S/CO2 partial pressures (20-25 bar total). The results are discussed on the background of available literature.

Subject
Scanning electron microscopy, Water, Sand, Corrosion rate, Iron sulfides, Steel coupons, Metal coupons, Sodium chloride, Weight loss coupons, Penetration, Powders, Corrosion coupons, Deposit corrosion
Keywords:
Sour corrosion, carbon steel, pitting, localized corrosion
© 2016 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).
2016
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.