Corrosion in acid mixtures is of great importance in many chemical process streams. However, corrosion data are not readily available in many of these environments. The effects of binary combinations of nitric, sulfuric, hydrochloric and hydrofluoric acids on corrosion of some Ni-base alloys and stainless steels are examined in this paper. It is shown that in addition to the expected passivating effect of nitric acid additions and increased corrosivity due to hydrochloric acid additions, unexpectedly high corrosion rates were noted for some alloys in some combinations of acids. The redox potentials of these acids and their mixtures were examined using platinized platinum and graphite. Finally the effect of anodic and cathodic polarization on true corrosion rates were investigated.

Subject
Acids, Stainless alloys, Acid concentration, Corrosion rate, Sulfuric acid, Nickel based alloys, Molybdenum alloys, Mixtures, Nitric acid, Solutions, Alloys, Hydrochloric acid, Electrode potential
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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