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Journal of Failure Analysis and Prevention

, Volume 18, Issue 1, pp 117–120 | Cite as

Failure Analysis of an 18% Cr Ferritic Stainless Steel in a Simulated Exhaust Condensate Containing Urea

  • M. L. Morgan
Technical Article---Peer-Reviewed
  • 69 Downloads

Abstract

Exposure in the laboratory simulating a selective catalytic exhaust system component using urea injection for NO x reduction and an artificial exhaust condensate in a diesel application has been performed. The hot, cyclic corrosion test was designed to simulate the conditions seen during use in a commercial vehicle application. The sample was subjected to a cyclic thermal gradient from ambient to a high of 500 °C and a 5% solution of urea containing sulfates, chlorides, and nitrates. During material evaluation for a selective catalytic exhaust component, a perforation was observed in a 439 ferritic stainless steel component. Examination of the sample found multiple modes of failure and multiple types of deposits from the urea test solution.

Keywords

Accelerated corrosion testing Fatigue analysis Ferritic stainless steel Urea corrosion 

Reference

  1. 1.
    U. Tröger, SCR Corrosion Experiences. Confidential Internal Publication (2013)Google Scholar

Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Materials Engineering LaboratoryFaurecia Clean MobilityColumbusUSA

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