Key to the satisfactory performance of automotive exhaust couplings is adequate high temperature corrosion resistance. This is becoming especially critical as service life is being extended by government legislation and as service temperatures are increasing due to the need for increased fuel efficiency and faster catalyst light-off. Currently employed and candidate coupling alloys, including 409, 304, 316Ti and 321 stainless steels (SS) and alloys 600, 800, 864 and 625, are selectively evaluated for resistance to road salt spray corrosion, oxidation in air and engine exhaust gases and under cyclic burner rig conditions. These laboratory results are compared with alloy performance of couplings subjected to test track and field exposure.

Subject
Weld attack, Corrosion resistant alloys, Stainless alloys, Salts, Nickel based alloys, Couplings, Magnification, Commercial alloys, Corrosion attacks, Engines, Stainless steel, Alloys, Oxidation
Keywords:
couplings, high temperature corrosion, cyclic oxidation, stress corrosion cracking, pitting, intergranular attack, alloy 409 (UNS S40900), alloy 304 (UNS S30400), alloy 316Ti (UNS S31600), alloy 321 (UNS S32100)
© 1998 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).
1998
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.