CaCO3 deposition on heated surfaces can be ameliorated by chemical, physical or biological methods each with various level of effectiveness. One of the most effective methods is addition of chemical inhibitors, although this can be a high OPEX solution due to the need to continually dose. Here the effects of a range of chemical inhibitors on scale formation were compared using a rapid scaling test, with the best results obtained when polyacrylic acid (PAA) was dosed. Non-chemical treatment methods include the use of magnetic, electronic and electrolytic devices. When comparing the effect of magnetic and electronic pre-treatment, reduction in scaling (51%) was observed only when using magnetic treatment in combination with particulate iron dosing. One option for non-chemical treatment is modification of the scaling surface and in this paper the effect of different surface material and its finish on CaCO3 formation was also investigated.

Subject
Steel surfaces, Water, Materials, Metal surfaces, Calcium carbonate, Scale inhibitors, Carbonate scales, Roughness, Scale formation, Scale, Zinc, Risk reduction, Scaling
Keywords:
Calcium carbonate, fouling, hardness, scale control
© 2004 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).
2004
Association for Materials Protection and Performance (AMPP)
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