Solubility measurements of Cr2O3, NiO, Co3O4, Fe3O4 and SiO2 in molten NaCl-KCl at 727°C and NaCl-KCl-Na2SO4-K2SO4 at 550°C were conducted in three different levels of basicity. The dissolution behavior of the oxides in the molten chlorides showed almost the same tendency as that shown in the result in molten Na2SO4 obtained by other researchers. In refuse incineration environment, protective Cr2O3 film is easily changed into CrO42− by molten chlorides contained in deposits because the basicity of the molten chlorides is made more basic by the effect of H2O in the combustion gas. In order to improve corrosion resistance of alloys, it would be better to add some elements such as Mo, V or W, which are expected to reduce the solubility of Cr2O3, and/or some elements such as Si or Ni, which are expected to produce protective oxide films having low solubility in a basic solution.

Subject
Acids, Salts, Oxides, Tubes, Sulfates, Oxide films, Dissolution, Solubility, Solvents, Corrosion protection, Corrosion resistance, Chlorides, Electrode potential
Keywords:
incineration, hot corrosion, chloride, sulfate, superheater, molten salt, waste, solubility
© 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)
You do not currently have access to this content.