Stress corrosion cracking and sulfide stress cracking in amine solution were reproduced in laboratory tests to clarify the mechanisms of both crackings. Stress corrosion cracking was observed in only CO2 saturated aqueous solution at a certain potential range and independent of microstructure. The mechanism for stress corrosion cracking is analogous to that in a solution containing HCO3-/CO3-2. Dissolved oxygen can shift the immersion potential to the cracking potential range and is one of the important environmental factors.

Cracking observed in a solution containing CN- ion was closely related to hardness and concentration of hydrogen in steel. Hydrogen evolved in the process of HS- reduction reaction can enter steel and cause cracking. The occurrence of sulfide stress cracking in an amine solution can be deduced with the environmental conditions such as pH and hardness of material.

Subject
Noble potential, Iron sulfides, Crack initiation, Potential range, Aqueous solutions, Polarization curves, Amines, Steel, Dissolved oxygen, Immersion, Hardness, Stress corrosion cracking, Hydrogen
Keywords:
stress corrosion cracking, carbon steel, monoethanolamine, carbon dioxide, hydrogen sulfide, dissolved oxygen, cyanide, carbonate, bicarbonate, pH
© 1992 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).
1992
Association for Materials Protection and Performance (AMPP)
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