Application of double loop electrochemical potentiodynamic reactivation test to austenitic and duplex stainless steels

Nathalie Lopez; Mariano Cid; Monique Puiggali; Inaki Azkarate; Alberto Pelayo

doi:10.1016/s0921-5093(97)00008-7

Application of double loop electrochemical potentiodynamic reactivation test to austenitic and duplex stainless steels

Nathalie Lopez^*, Mariano Cid, Monique Puiggali, Inaki Azkarate, Alberto Pelayo

^*Corresponding author for this work

TECNALIA Research & Innovation

Research output: Contribution to journal › Article › peer-review

122 Citations (Scopus)

Abstract

Double loop electrochemical potentiodynamic reactivation (DLEPR) tests are performed on an austenitic (317L) and an austeno-ferritic (UNS S31803) stainless steels. In order to optimise results, the standard electrochemical solution has been modified by adding NaCl to the composition and by increasing the concentration of H₂SO₄. Results show a high resistance to intergranular corrosion of the 317L heat treated at 675°C for 30 min to 24 h. On contrast, the duplex stainless steel corrosion resistance decreases with time of sensitisation. Low exposure time (1 h at 675°C) provides low reactivation current density whereas longer exposure time (10 h) shows an increase in the value of this reactivation current, which is due to the formation of chromium carbides and sigma phase at grain boundaries leading to more chromium depleted areas. Heat treatment at 900°C shows a high reactivation proportional to σ-phase precipitation. The aim of this work is to validate the DLEPR technique for detecting susceptibility to intergranular corrosion of duplex stainless steels. This test is not yet normalised and could be used for on-site measurement.

Original language	English
Pages (from-to)	123-128
Number of pages	6
Journal	Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume	229
Issue number	1-2
DOIs	https://doi.org/10.1016/s0921-5093(97)00008-7
Publication status	Published - 30 Jun 1997

Funding

The authors wish to thank Mr A. Del Barrio for his assistance during the course of this work. The authors also gratefully acknowledge the support of ANVAR (France) and the Cooperation Program Euskadi-Aquitaine for this research project.

Funders	Funder number
ANVAR
Cooperation Program Euskadi-Aquitaine

Keywords

Austenitic stainless steel
Corrosion
DLEPR

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10.1016/s0921-5093(97)00008-7

Cite this

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title = "Application of double loop electrochemical potentiodynamic reactivation test to austenitic and duplex stainless steels",

abstract = "Double loop electrochemical potentiodynamic reactivation (DLEPR) tests are performed on an austenitic (317L) and an austeno-ferritic (UNS S31803) stainless steels. In order to optimise results, the standard electrochemical solution has been modified by adding NaCl to the composition and by increasing the concentration of H2SO4. Results show a high resistance to intergranular corrosion of the 317L heat treated at 675°C for 30 min to 24 h. On contrast, the duplex stainless steel corrosion resistance decreases with time of sensitisation. Low exposure time (1 h at 675°C) provides low reactivation current density whereas longer exposure time (10 h) shows an increase in the value of this reactivation current, which is due to the formation of chromium carbides and sigma phase at grain boundaries leading to more chromium depleted areas. Heat treatment at 900°C shows a high reactivation proportional to σ-phase precipitation. The aim of this work is to validate the DLEPR technique for detecting susceptibility to intergranular corrosion of duplex stainless steels. This test is not yet normalised and could be used for on-site measurement.",

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Application of double loop electrochemical potentiodynamic reactivation test to austenitic and duplex stainless steels. / Lopez, Nathalie; Cid, Mariano; Puiggali, Monique et al.
In: Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, Vol. 229, No. 1-2, 30.06.1997, p. 123-128.

Research output: Contribution to journal › Article › peer-review

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T1 - Application of double loop electrochemical potentiodynamic reactivation test to austenitic and duplex stainless steels

AU - Lopez, Nathalie

AU - Cid, Mariano

AU - Puiggali, Monique

AU - Azkarate, Inaki

AU - Pelayo, Alberto

PY - 1997/6/30

Y1 - 1997/6/30

N2 - Double loop electrochemical potentiodynamic reactivation (DLEPR) tests are performed on an austenitic (317L) and an austeno-ferritic (UNS S31803) stainless steels. In order to optimise results, the standard electrochemical solution has been modified by adding NaCl to the composition and by increasing the concentration of H2SO4. Results show a high resistance to intergranular corrosion of the 317L heat treated at 675°C for 30 min to 24 h. On contrast, the duplex stainless steel corrosion resistance decreases with time of sensitisation. Low exposure time (1 h at 675°C) provides low reactivation current density whereas longer exposure time (10 h) shows an increase in the value of this reactivation current, which is due to the formation of chromium carbides and sigma phase at grain boundaries leading to more chromium depleted areas. Heat treatment at 900°C shows a high reactivation proportional to σ-phase precipitation. The aim of this work is to validate the DLEPR technique for detecting susceptibility to intergranular corrosion of duplex stainless steels. This test is not yet normalised and could be used for on-site measurement.

AB - Double loop electrochemical potentiodynamic reactivation (DLEPR) tests are performed on an austenitic (317L) and an austeno-ferritic (UNS S31803) stainless steels. In order to optimise results, the standard electrochemical solution has been modified by adding NaCl to the composition and by increasing the concentration of H2SO4. Results show a high resistance to intergranular corrosion of the 317L heat treated at 675°C for 30 min to 24 h. On contrast, the duplex stainless steel corrosion resistance decreases with time of sensitisation. Low exposure time (1 h at 675°C) provides low reactivation current density whereas longer exposure time (10 h) shows an increase in the value of this reactivation current, which is due to the formation of chromium carbides and sigma phase at grain boundaries leading to more chromium depleted areas. Heat treatment at 900°C shows a high reactivation proportional to σ-phase precipitation. The aim of this work is to validate the DLEPR technique for detecting susceptibility to intergranular corrosion of duplex stainless steels. This test is not yet normalised and could be used for on-site measurement.

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KW - Corrosion

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Application of double loop electrochemical potentiodynamic reactivation test to austenitic and duplex stainless steels

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