Failure Analysis of an 18% Cr Ferritic Stainless Steel in a Simulated Exhaust Condensate Containing Urea
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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.
KeywordsAccelerated corrosion testing Fatigue analysis Ferritic stainless steel Urea corrosion
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