General corrosion occurred when titanium (Grade 5) was exposed to hot alkaline hydrogen peroxide solutions (9<pH<11, CH2O2 = 2000 - 3500 mg/l). The uniform corrosion was fairly rapid and it has been verified by electrochemical and weight loss measurements. Both measurements showed comparable results. The uniform corrosion behaviour of titanium appeared to depend on both the high pH-value and on the concentration of hydrogen peroxide in the solutions. A critical pH-value for titanium can be determined when the hydrogen peroxide concentration is kept at a constant level. The hydrogen peroxide ion is observed to be the harmful anion for the general corrosion attack of titanium. This anion is stable in alkaline hydrogen peroxide solutions only.

Subject
Ions, Hydrogen concentration, Corrosion rate, Hydrogen peroxide, Dissolution, Alkaline solutions, Titanium oxide, Constants, Ion concentrations, Titanium, Polarization resistance, Corrosion potential, Uniform corrosion
Keywords:
titanium, uniform corrosion, hydrogen peroxide bleaching, threshold conditions, hydrogen peroxide ion
© 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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