Potential-pH (Pourbaix) diagrams are used as road maps for aiding in predicting the most stable states of a metal, its corrosion products, and its associated ions in an aqueous solution. It is presented on plot of equilibrium potential vs. hydrogen ion activity. Organic ions including those of biological importance such as amino acids can affect the most thermodynamically stable states associated with the metal. This paper explores how potential-pH diagrams might be used as aids for screening such organic corrosion inhibitors and sequestering agents. The diagrams were generated using a newly developed internet accessible web based application. The web application and its advantages over comparable single user personal computer platform-based applications are also summarized.

Subject
Acids, Stability, Thermodynamics, Ions, Iron, Pourbaix diagrams, Acidity, Free energy, Metals, Copper, Nickel, Corrosion potential, Hydrogen
Keywords:
potential-pH diagram, Pourbaix diagram, web based application, internet, corrosion inhibitor, sequestering agent, amino acid, tartaric acid, hippuric acid, 1-Hydroxyethylidene-1
© 2007 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).
2007
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.