Relation Between Pitting Potential, Degree of Sensitization, and Reversed Austenite in a Supermartensitic Stainless Steel

Pitting potential (Ep) and degree of sensitization (DOS) of a supermartensitic stainless steel (SMSS) were determined on specimens heat-treated at different tempering temperatures (550°C, 575°C, 600°C, 625°C, 650°C, or 700°C). The effect of pH (pH 6 and pH 8) on the Ep obtained in a 3.5 wt% NaCl sol...

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Bibliographic Details
Published in:	Corrosion (Houston, Tex.) Vol. 73; no. 8; pp. 953 - 960
Main Authors:	Calderón-Hernández, José Wilmar, Hincapie-Ladino, Duberney, Filho, Edson Benedito Martins, Magnabosco, Rodrigo, Alonso-Falleiros, Neusa
Format:	Journal Article
Language:	English
Published:	Houston NACE International 01-08-2017
Subjects:	Aqueous solutions Austenite Austenitic stainless steels Correlation Correlation analysis Corrosion Corrosion potential Corrosion resistance Electrolytes Heat treatment Martensitic stainless steels Microstructure Morphology pH effects Pitting (corrosion) Pitting potential Scanning electron microscopy Simulation Sodium chloride Stainless steel Sulfuric acid Sulphuric acid Tempering
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Summary:	Pitting potential (Ep) and degree of sensitization (DOS) of a supermartensitic stainless steel (SMSS) were determined on specimens heat-treated at different tempering temperatures (550°C, 575°C, 600°C, 625°C, 650°C, or 700°C). The effect of pH (pH 6 and pH 8) on the Ep obtained in a 3.5 wt% NaCl solution, as well as the correlation between Ep and DOS obtained in 0.5 M H2SO4 + 0.01 M KSCN solution, was studied. The results showed correlation between Ep and DOS values, the samples with the higher DOS values being the ones with the lower Ep. A mechanism was proposed that would explain the correlation of the presence of reversed austenite formed during tempering, Ep, and DOS.
ISSN:	0010-9312 1938-159X
DOI:	10.5006/2311