Corrosion behaviour of high purity aluminum was evaluated by potentiodynamic polarization measurements in 50 % hydrogen peroxide as a function of chloride and nitrate concentrations and in the presence of some amino(alkyl)phosphonates which are widely used as stabilizers against catalytic decomposition for hydrogen peroxide. Chloride ions, already at very low concentrations, induce pitting type corrosion for aluminum. This pitting can be prevented by sufficient additions of nitrate ions. Ammonium nitrate and nitric acid were equally efficient.

Subject
Acids, Water, Materials, Aluminum, Phosphonates, Hydrogen peroxide, Reference electrodes, Ion concentrations, Nitrates, Corrosion behavior, Pitting, Chlorides, Samples
Keywords:
hydrogen peroxide, aluminum, pitting, chloride, nitrate
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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