New corrosion protective coatings were proposed and long term corrosion tests were performed. These coatings, based on modified polyaniline, showed that hexacyanoferrate improved their anticorrosion properties. Our recent research gives some information about the increasing oxygen diffusivity barrier when nano-TiO2 is added. The goal of this paper was to check if there is a synergy effect between these two compounds. The polyaniline-hexacyanoferrate-nano-TiO2 composites were prepared by in situ oxidative polymerization of aniline in solutions of two different inorganic acids. The corrosion tests were carried out on carbon steel substrates coated by alkyd coatings (using frame film applicator, one-coat application) containing the anticorrosion pigments 0.5 mass% of these composites in comparison to coating modified with the same amount of polyaniline hexacyanoferrate. The salt spray and EIS (Electrochemical Impedance Spectroscopy) investigations were carried out according to the PN-EN ISO 9227:2017 and PN-EN ISO 16773-2:2016 standards. The EIS test was performed for six weeks, with weekly impedance measurements. The results showed highest anticorrosion resistance of coatings modified with PANI-hexacyanoferrate-nano-TiO2 composites, especially the composite obtained in solution of sulfuric acid.

Subject
Acids, Electrochemical impedance spectroscopy, Water, Coatings, Pigments, Salts, Substrates, Sulfuric acid, Impedance, Potassium, Titanium oxide, Composites, Corrosion protection
Keywords:
corrosion, steel, exposure tests, conductive polymers, titanium dioxide
© 2018 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).
2018
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.