Modern petroleum industry has many significant corrosion concerns which are defined by the H2S-Air-NaCl-H2O-Fe five-way system. Basically, we have an aqueous H2S attack upon iron or steel, and the air contents and the electrolyte levels may vary in this five-component system. If we assume the presence of water, an electrolyte and iron, then we have a pseudo-binary of air-H2S to be concerned with in general corrosion, stress cracking of high strength steels, and hydrogen blistering. Such aqueous H2S attacks occur both in the vapor zones and upon the bottoms of sour crude storage tanks. They occur in sour crude pipelines, and especially those that suffer cyclical services wherein anaerobic aqueous H2S attacks are alternated with aerobic aqueous system attacks during pipeline shipments of petroleum products. They occur in sour crude-producing oil wells that bleed in small amounts of air to mix with the aqueous H2S vapors. Supertankers or VLCC's engaged in the handling and transport of sour crude oils may be especially susceptible to this vicious pseudo-binary corrosion attack. These high-H2S mixture corrosion attacks are considered to be the basis of forming pyrophoric iron sulfides, sometimes a ship explosion cause.

Subject
Sensors, Hydrogen permeation, Ions, Corrosion rate, Probes, Weight loss coupons, Vapors, Liquids, Sour crude, Steel, Brines, Corrosion coupons, Hydrogen
© 1977 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).
1977
Association for Materials Protection and Performance (AMPP)
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