In order to increase the corrosion resistance of aluminized steel sheets for automotive mufflers, the authers produced aluminized steel sheets coated with thin (1-2μm) silicone. And we investigated the effect of the silicone-structure coating on thermal stability and corrosion resistance, by measuring the thermal properties of the coatings and AC impedance of coated metals.

  1. Corrosion resistance depended on the thermal stability of the silicone films, which was related to the trifanctional structure unit content, phenyl group content and molecular weight.

  2. Aluminized steel sheets with a 1-2μm silicone coating, consisting of a 40-55% trifanctional structure unit, with a 35-50% phenyl group and a wide molecular weight distribution (for example 102-107 converting polystyrene), had good corrosion resisrance after heating at 300°C for 500 hours.

  3. The most relevant facter to corrosion resistance was molecular weight distribution.

Subject
Steel structures, Films, Materials, Silicones, Impedance, Molecular weight, Varnishes, Steel sheet, Impedance measurements, Film formation, Heat, Corrosion resistance, Resins
Keywords:
aluminized steel sheets, silicone coating, trifanctional structure, phenyl group, molecular weight distribution, AC impedance, thermal stability, maffler
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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