The Chemical and structural characteristics of porphyrins suggest that this class of molecules should offer protection of metallic surfaces by chemisorption. Therefore we have prepared and tested more than twenty-five different porphyrins and several of their metallo-derivatives. Corrosion and electrochemical studies have shown that the inhibition efficiency of a porphyrin improves (a) with its water-soluble nature, (b) with its conversion to a metalloderivative and (c) when applied by vapor deposition at temperatures above 300 C. Best corrosion inhibition (in 1% NaCl) was shown by tetraphenylporphin (TPP) on iron when it was vapor deposited at 350 C. We have also examined porphyrin treated iron surfaces with the scanning electron microscope and by paramagnetic and ferromagnetic resonance methods.

Subject
Water, Corrosion rate, Metal surfaces, Aqueous environments, Sodium chloride, Iron, Solubility, Vapors, Sodium chloride solution, Metals, Specimen preparation, Corrosion inhibitors, Electrodes
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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