The transpassive dissolution mechanism of highly alloyed stainless steels: I. Experimental results and modelling procedure

The transpassive dissolution mechanism of highly alloyed stainless steels: I. Experimental results and modelling procedure

The transpassive dissolution of austenitic stainless steels (AISI 316L, AISI 904L, 254SMO and 654SMO) in a 0.5 M sulphate solution with pH 2 was studied by conventional and rotating ring–disc voltammetry, as well as electrochemical impedance spectroscopy. The main process in the transpassive potenti...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Corrosion science 2002-12, Vol.44 (12), p.2675-2697
Hauptverfasser: Betova, Iva, Bojinov, Martin, Laitinen, Timo, Mäkelä, Kari, Pohjanne, Pekka, Saario, Timo
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Corrosion
Corrosion environments
EIS
Exact sciences and technology
Kinetic parameters
Metals. Metallurgy
Modelling studies
RRDE
Stainless steel
Transpassivity
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The transpassive dissolution of austenitic stainless steels (AISI 316L, AISI 904L, 254SMO and 654SMO) in a 0.5 M sulphate solution with pH 2 was studied by conventional and rotating ring–disc voltammetry, as well as electrochemical impedance spectroscopy. The main process in the transpassive potential region was found to be the release of soluble Cr(VI), while small amounts of lower-valency Cr or Mo species are released as well. Secondary passivation readily occurs for AISI 316L, whereas the remaining highly alloyed steels dissolve at high current densities in the whole potential range studied. The dissolution rate was found to increase in the order AISI 904L
ISSN:0010-938X
1879-0496
DOI:10.1016/S0010-938X(02)00073-2