ChemInform Abstract: Initiation of Corrosion Pits at Inclusions on 304 Stainless Steel.
Abstract
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ChemInform Abstract
The title process is studied in 0.1 M NaCl at the site of about 200 inclusions using a photolitography technique for location and a combination of SEM, EDX, and AES spectroscopic methods for the characterization of specific sites on 304 stainless steel. Initiation and growth of pits to significant sizes are observed only from MnS and mixed manganese sulfide/oxide inclusions of sizes above 0.7 μm. Dissolution of MnS is accompanied by high Mn and Cl concentrations in the pit cavity and high S concentrations at the site of inclusion and its surrounding. Small MnS inclusions do not initiate pits due to dispersal of dissolution products. Under severe pitting conditions flower-like deposits of Cu are detected on the inclusion surface of the steel prior to significant pit growth.
