PBTC, a proven scale inhibitor, is more and more finding use in corrosion-inhibiting cooling water formulations. In order to investigate the inhibiting mechanism of this compound, steel test coupons were examined using ESCA and Auger spectroscopy (with depth profiles) and scanning electron microscopy. From these methods it was found that the inhibitor effect is based on the formation of very thin films of insoluble, amorphous, water-free PBTC-Ca+2 -Fe(III) compounds. The influence of several factors on the formation of these films will be discussed including the surface conditions of the steel before contact with cooling water and typical cooling water parameters such as oxygen content, cations, anions, buffer capacity, and pH.

Subject
Films, Steel surfaces, Water, Ions, Hydroxides, Metal surfaces, Phosphonates, Iron, Calcium, Film formation, Corrosion inhibitors, Oxygen, Cooling water
© 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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