This paper reports results of a study comparing the characteristics of mineral scale formation (BaSO4) in a bulk solution and at a solid surface. An electrochemically-based technique, in which the scale was formed on a rotating disk electrode has been used in conjunction with assessment of bulk precipitation measurement. Results from this study have shown that the action of a commercial PolyPhosphinoCarboxylic Acid inhibitor is different in the bulk solution and at the surface. The addition of 25 ppm PPCA, although effective in retarding bulk precipitate formation, enhances the level of surface scaling. Practical implications resulting from these findings are discussed.

Subject
Water, Precipitation (solids), Precipitates, Scale inhibitors, Bulk solution, Surfaces, Metallic surfaces, Chemical inhibition, Scale formation, Corrosion inhibitors, Scale, Electrodes, Scaling
Keywords:
scale, barium sulfate, rotating disk electrode, inhibition
© 1999 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).
1999
Association for Materials Protection and Performance (AMPP)
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