Stress Corrosion Cracking of Austenitic Type 304 Stainless Steel in Solutions of Hydrochloric Acid + Sodium Chloride at Ambient Temperature

1 November 1994

journal article
Published by Association for Materials Protection and Performance (AMPP) in Corrosion

Vol. 50 (11) , 873-878
https://doi.org/10.5006/1.3293477

Abstract

Austenitic type 304 (UNS S30400) stainless steel is susceptible to stress corrosion cracking (SCC) in acidic chloride (Cl⁻) solutions at ambient temperature. In this study, a layer of adsorbed product film enriched in chromium and nickel was found to form on the metal surface in the solutions. This product film had a protective role over the base metal. The nucleation of stress corrosion cracks was connected with the formation of the film and the buildup of a high local concentration of Cl⁻. Observation by scanning electron microscopy and transmission electron microscopy showed the propagation of stress corrosion cracks was associated with selective corrosion of deformation-induced martensite. The probable mechanism of transgranular SCC in this system was slip dissolution.

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