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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 I. Precipitation-free states
Autore:
Perren, RA; Suter, TA; Uggowitzer, PJ; Weber, L; Magdowski, R; 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 Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Lab Mech Met, CH-1015Lausanne, Switzerland Ecole Polytech Fed Lausanne Lausanne Switzerland CH-1015 ne, Switzerland
Titolo Testata:
CORROSION SCIENCE
fascicolo: 4, volume: 43, anno: 2001,
pagine: 707 - 726
SICI:
0010-938X(200104)43:4<707:CROSDS>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
MN-N SYSTEM; THERMODYNAMIC EVALUATION; FE-CR; LOCALIZED CORROSION; NITROGEN;
Keywords:
high nitrogen stainless steels; duplex structures; partitioning; corrosion resistance; microelectrochemical method; pitting potential;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
20
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 I. Precipitation-free states", CORROS SCI, 43(4), 2001, pp. 707-726

Abstract

A new mircoelectrochemical method was applied to perform potentiodynamic polarisation experiments on areas in the range of 10 mum For the first time,the individual corrosion behaviour of both single phases in super duplex stainless steels was determined. The results show a good correlation with the empirical pitting resistance equivalent number (PREN) of the corresponding single phase. The microelectrochemical experiments have revealed two different kinds of interactions between the ferrite and the austenite phase at the phase boundary, namely a superposition or a separation of the two polarisation curves of the single phases. Potentiodynamic polarisation of large areas with representative amounts ofboth phases are performed in hydrochloric acid electrolyte in order to compare the corrosion behaviour of the single phases with the corrosion behaviour of the entire alloy. Both. the pitting potentials, evaluated by means of macroelectrochemical experiments in pH-neutral lithium chloride electrolyte, and the critical crevice corrosion temperatures show a good correlationwith the PREN of the weaker phase. Part I of this paper deals primarily with solution annealed materials. Solution annealing of the samples was performed at temperatures where minimal amounts of precipitates were formed and where the element partitioning determines the corrosion resistance of the single phases. Part II deals with the influence of precipitations on the corrosion behaviour. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 19:52:45