This paper presents a comparative evaluation of Al, Zn and Al-Zn coatings on carbon steel, exposed to a coastal-marine atmosphere. It is a very aggesive atmosphere with high wind velocities (corrosion-erosion rate ≈1.4 mm/year for ASTM 1029 steel). A metallized zinc coating with a pore sealer was also evaluated. ISO and ASTM standards were used for the evaluation.

After a two-year exposure the best performance was achieved by the Al and Al rich alloy (85% Al-15%Zn) with some damage of the coatings. But the Zn metallized coating, with a pore sealer, did not show signs of damage.

Subject
Coating performance, Zinc rich coatings, Steel surfaces, Coatings, Materials performance, Aluminum, Galvanized coatings, Corrosion products, Scale formation, Steel, Metallic coatings, Wind, Aluminum alloys
Keywords:
Zn, Al & Al-Zn coatings, carbon steel, atmospheric corrosion
© 1999 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).
1999
Association for Materials Protection and Performance (AMPP)
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