Corrosion behavior of ferritic stainless steels was studied in artificial exhaust gas condensates containing corrosive ions such as Cl− and SO32−. Continuous immersion tests in flasks and Dip & Dry tests by using the alternate corrosion tester with a heating system clarified the effects of chromium and molybdenum additions on the corrosion resistance of a ferritic stainless steel in the artificial exhaust gas condensates. Effects of surface oxidation on the corrosion behavior were investigated in a temperature range of 573K to 673K. Oxidation at 673K reduced the corrosion resistance of the ferritic stainless steels in the artificial environment of the automobile muffler. Particulate matter deposited on the muffler inner shell from the automobile exhaust gas was also examined. Deposited particulate matter increased the corrosion rate of the ferritic stainless steel. Finally, we also investigated the corrosion of the automobile mufflers made of Type 436L ferritic stainless steel with 18% chromium - 1.2% molybdenum after 24 months, in Japan. The sets of results clarified that Type 436L ferritic stainless steel as the material for the automobile muffler exhibited acceptable corrosion resistance.

Subject
Immersion tests, Ions, Molybdenum, Corrosion resistant alloys, Metal surfaces, Molybdenum alloys, Chromium, Condensates, Corrosion behavior, Automotive, Corrosion resistance, Ferritic stainless steel, Alternate immersion tests
Keywords:
automobile, exhaust system, automobile muffler, automobile silencer, pitting corrosion, ferritic stainless steel, Type 436L, Type 409L, Type 410L, aluminized steel
© 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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