Rust preventives were applied to steel coupons and characterized by electrochemical techniques and ASTM(1) B117 standard method using 5% sodium chloride as the electrolyte. The results obtained by both approaches are compared and used to explain the mechanism and damage evolution at the interface of rust preventive film and steel substrate.

Electrochemical impedance spectroscopy (EIS) is a technique that has been used to quantify and characterize the mechanisms that occur when metal/film or metal/coating interfaces are exposed to corrosive environments. This work describes the methodologies required for advanced electrochemical technique setup with EIS, which qualitatively characterizes soft films that act as barriers to corrosion. The proposed technical method is a demonstration using different thin film samples that can guide the path forward for the most suitable selection of a film that will prevent corrosion of steel substrates exposed to high concentrations of chlorides.

Subject
Corrosion prevention, Test methods, Electrochemical impedance spectroscopy, Thin films, Coatings, Substrates, Sodium chloride, Impedance, Nyquist plots, Corrosion products, Interfaces, Rust, Electrolytes
Keywords:
soft coatings, electrochemical impedance spectroscopy, ASTM B117, metal/film interface
© 2013 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).
2013
Association for Materials Protection and Performance (AMPP)
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