Some of the most fundamental problems investigated in the laboratory are concerned with the laws of chemical equilibrium. This is certainly true in the attempt to apply scientific principles to the field of chemical cleaning. The laboratory data one obtains regarding the solubility of a deposit in a solvent so as to provide optimum dissolution of the deposit during chemical cleaning removal is a study in equilibrium in heterogeneous systems. The determination of the corrosion rate of a metal in different solvents used for chemical cleaning is another example of a study of heterogeneous equilibrium. In both of these cases, distinct physical bodies which can be separated mechanically are involved and such cases of equilibrium are referred to as heterogeneous. There are other cases wherein the systems under study are alike through and through, from which distinct bodies cannot be isolated. An example of this latter would be the study of the ionization characteristics of an acid when diluted with water: this type of equilibrium is referred to as homogeneous in nature.

Subject
Acid inhibitors, Corrosion rate, Chemical cleaning, Solvents, Activation energy, Chemical inhibition, Metals, Corrosion inhibitors, Corrosion data, Carbon steel, Catalysts, Hydrochloric acid, Chemical reactions
© 1979 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).
1979
Association for Materials Protection and Performance (AMPP)
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