A hot-dip aluminum coated stainless steel sheet (Al coated stainless steel sheet) have been newly developed as a material for automotive exhaust systems. The Al coated stainless steel exhibited excellent corrosion resistance in accelerated laboratory tests closely simulating actual service conditions.

Under very severe test conditions, type 430 stainless steel sheet and Al coated low carbon steel sheet were remarkably attacked. On the contrary, Al coated type 409 stainless steel sheet had no red-rust even on the base steel such as cut edges and cross-scribes, and also had no attack of the base steel. It was confirmed by electrochemical investigation that Al coating and alloy layer provided galvanic protection to type 409 stainless steel in these environments.

Subject
Steel surfaces, Materials, Stainless alloys, Corrosion testing, Condensates, Dissolution, Steel, Aluminum coatings, Corrosion resistance, Stainless steel, Aluminum alloys, Galvanic current, Corrosion potential
Keywords:
hot-dip aluminum coated stainless steel, exhaust system, corrosion, galvanic protection, galvanic current, galvanic potential
© 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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