A corrosion data base for Gr.2 titanium derived from laboratory weight-loss testing has been developed in uninhibited and inhibited alkaline 0.2-0.3 wt.% H2O2 solutions at 65°-80°C. Although titanium resistance to pure, uninhibited peroxide solutions is very limited, useful resistance dramatically expands in solutions containing inhibitive species commonly existing in bleach plant processes. Effective inhibitors in descending order include Ca+2 ion, Mg salts, and silicate. Addition of EDTA and DTPA chelants has no detrimental effect on Ca+2 ion inhibition unless chelant is added to excess. Based on this corrosion data base, expanded application guidelines for acceptable use of Gr.2 titanium in Ca+2 ion-inhibited solutions containing a maximum of 0.3 wt.% H2O2 are derived at 65°, 70°, and 80°C.

Subject
Ions, Hydrogen concentration, Corrosion rate, Silicates, Chelation, Alkaline solutions, Peroxide, Acidity, Ion concentrations, Chemical inhibition, Corrosion inhibitors, Titanium, Corrosion resistance
© 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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