To minimize attack on metals during cleaning with acid solutions containing dissolved iron in the ferric state, both hydrogenevolution corrosion and ferric-ion corrosion must be effectively inhibited. There are many inhibitors which effectively reduce hydrogen-evolution corrosion, but these have a relatively small effect on ferric-ion corrosion. Data are provided which show the synergistic action of certain substituted thioureas and thioamides with certain alkali-metal and amine alkyl or alkylaryl sulfonates in effectively inhibiting both ferric-ion and hydrogen-evolution corrosion on ferrous and other metals during exposure to a variety of acids. Potentiostatic measurements indicate that inhibition is a result of retardation of cathodic reactions.

Subject
Acids, Acid inhibitors, Ions, Sulfonates, Iron oxide, Corrosion rate, Tin, Sulfates, Oxalic acid, Ion concentrations, Sodium, Corrosion inhibitors, Steel
© 1972 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).
1972
Association for Materials Protection and Performance (AMPP)
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