Chloride-based deposits can significantly accelerate the progress of elevated temperature degradation of stainless steels and nickel-base alloys. Such deposits are present in the byproducts of combustion of alternative fuels and are common in the environment experienced by hot automotive exhaust components. A test was developed to investigate the susceptibility of materials to attack under chloride salt deposits at elevated temperatures, using a sample incorporating stressed, unstressed, and welded segments. Both gravimetric and metal recession measurements were used to determine the progression of corrosion. Nickel-base alloys were found to be resistant to deposit-assisted attack, while common stainless steels were prone to scaling and exfoliation. Results will also be presented on recently developed higher-alloy content stainless steels which exhibit corrosion resistance similar to that of the nickel-base superalloys, and on lean austenitic stainless alloys intended as replacements for traditional austenitic stainless steels.
Deposit-assisted corrosion of heat-resistant alloys
2009
20 Seiten, 15 Quellen
Aufsatz (Konferenz)
Englisch
Abgaskomponente , Ausscheidungsprodukt , austenitischer nichtrostender Stahl , Automobilindustrie , Chloridkorrosion , hitzebeständige Legierung , hochlegierter Stahl , Hochtemperaturoxidation , Korrosionsprodukt , Motorabgas , Nickelsuperlegierung , thermische Zersetzung , Verbrennungsreaktion , Wärmebeständigkeit
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