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Titolo:
Corrosion resistance of super duplex stainless steels in chloride ion containing environments: investigations by means of a new microelectrochemical method II. Influence of precipitates
Autore:
Perren, RA; Suter, T; Solenthaler, C; Gullo, G; Uggowitzer, PJ; Bohni, H; Speidel, MO;
Indirizzi:
ETH Zurich, Swiss Fed Inst Technol, Inst Met, CH-8092 Zurich, Switzerland ETH Zurich Zurich Switzerland CH-8092 t Met, CH-8092 Zurich, Switzerland ETH Zurich, Swiss Fed Inst Technol, Inst Mat Chem & Corros, CH-8092 Zurich, Switzerland ETH Zurich Zurich Switzerland CH-8092 orros, CH-8092 Zurich, Switzerland
Titolo Testata:
CORROSION SCIENCE
fascicolo: 4, volume: 43, anno: 2001,
pagine: 727 - 745
SICI:
0010-938X(200104)43:4<727:CROSDS>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
MN-N SYSTEM; THERMODYNAMIC EVALUATION; FE-CR; PITTING CORROSION;
Keywords:
high nitrogen stainless steels; duplex structures; sigma phase; chromium nitrides; secondary austenite; corrosion resistance; microelectrochemical method; pitting potential;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Uggowitzer, PJ ETH Zurich, Swiss Fed Inst Technol, Inst Met, CH-8092 Zurich, Switzerland ETH Zurich Zurich Switzerland CH-8092 Zurich, Switzerland
Citazione:
R.A. Perren et al., "Corrosion resistance of super duplex stainless steels in chloride ion containing environments: investigations by means of a new microelectrochemical method II. Influence of precipitates", CORROS SCI, 43(4), 2001, pp. 727-745

Abstract

Inappropriate heat treatment of super duplex stainless steels may cause the precipitation of undesired phases, which drastically decrease the corrosion resistance and which may also reduce the toughness. The most important precipitates, namely sigma phase, chromium nitrides, and one type of secondary austenite are shortly described. Special attention is paid to their influence on the distribution of the main alloying elements, which is a crucial factor For the corrosion resistance. A new microelectrochemical investigation method enables for the first timethe local potentiodynamic measurements of areas in the range of 10 mum diameter and therefore reveals the influence of small precipitates on the corrosion resistance. The results are compared with macroelectrochemical measurements. critical crevice corrosion investigations and the element distribution. The depletion of chromium and molybdenum due to the formation of precipitates is related to a decrease in corrosion resistance. (C) 2001 ElsevierScience Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 01:13:03