Perforation corrosion of the door hems was investigated after 10-year field exposure in Detroit. Pitting corrosion was less severe on the hem which was more tightly constructed and in which more amount of zinc corrosion products were found. Laboratory CCT revealed that when corrosion products such as ZnO were stagnant in the hem, rate of pitting corrosion was reduced. This is because dissolution of zinc coating makes the stagnant solution in the hem alkaline, which helps prevent corrosion of the substrate. In this context, zinc coating plus tight setup for the hem are recommended to delay perforation.

Subject
Zinc rich coatings, Adhesives, Perforation, Corrosion rate, Corrosion products, Zinc oxide, Gold, Steel, Rust, Pitting, Corrosion protection, Zinc, Chlorides
Keywords:
perforation corrosion, door hem, galvanized steel, adhesives, X-ray diffraction analysis, micro climate, accelerated corrosion test
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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