Effect of Microstructure on Atmospheric-Induced Corrosion of Heat-treated Grade 2205 and 2507 Duplex Stainless Steels

C. Oernek; A.H. Ahmed; D.L. Engelberg

Effect of Microstructure on Atmospheric-Induced Corrosion of Heat-treated Grade 2205 and 2507 Duplex Stainless Steels

C. Oernek, A.H. Ahmed, D.L. Engelberg

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Abstract

Atmospheric-induced corrosion tests under MgCl2 salt deposits were carried out on duplex stainless steel grade 2205 and 2507. As-received and 750°C heat-treated material conditions were investigated, and selected micro-structural sites targeted with salt-laden deposits to determine their corrosion response. Deposits were wetted under controlled climatic conditions at 80C and 40% relative humidity. Observations of micro-structural attack indicated the presence of net anodic and net cathodic sites. Ferrite was net anode with respect to austenite and hence more susceptible to atmospheric-induced corrosion in both as-received microstructures. Ferrite and ferrite/austenite interfaces were selectively attacked in heat-treated grade 2205, whereas mainly primary and secondary austenite in heat-treated grade 2507. Scanning Kelvin Probe Force Microscopy and Magnetic Force Microscopy were used to obtain high-resolution information about susceptible microstructure sites.

Original language	English
Title of host publication	EuroCorr2012
Place of Publication	Turkey
Publisher	European Federation of Corrosion
Publication status	Published - Sept 2012
Event	EuroCorr 2012 - Istanbul, Turkey Duration: 9 Sept 2012 → 20 Sept 2012

Conference

Conference	EuroCorr 2012
City	Istanbul, Turkey
Period	9/09/12 → 20/09/12

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@inproceedings{aa373e0ad7f34cdb9e4e35b7a272683c,

title = "Effect of Microstructure on Atmospheric-Induced Corrosion of Heat-treated Grade 2205 and 2507 Duplex Stainless Steels",

abstract = "Atmospheric-induced corrosion tests under MgCl2 salt deposits were carried out on duplex stainless steel grade 2205 and 2507. As-received and 750°C heat-treated material conditions were investigated, and selected micro-structural sites targeted with salt-laden deposits to determine their corrosion response. Deposits were wetted under controlled climatic conditions at 80C and 40% relative humidity. Observations of micro-structural attack indicated the presence of net anodic and net cathodic sites. Ferrite was net anode with respect to austenite and hence more susceptible to atmospheric-induced corrosion in both as-received microstructures. Ferrite and ferrite/austenite interfaces were selectively attacked in heat-treated grade 2205, whereas mainly primary and secondary austenite in heat-treated grade 2507. Scanning Kelvin Probe Force Microscopy and Magnetic Force Microscopy were used to obtain high-resolution information about susceptible microstructure sites.",

author = "C. Oernek and A.H. Ahmed and D.L. Engelberg",

year = "2012",

month = sep,

language = "English",

booktitle = "EuroCorr2012",

publisher = "European Federation of Corrosion",

address = "Belgium",

note = "EuroCorr 2012 ; Conference date: 09-09-2012 Through 20-09-2012",

}

TY - GEN

T1 - Effect of Microstructure on Atmospheric-Induced Corrosion of Heat-treated Grade 2205 and 2507 Duplex Stainless Steels

AU - Oernek, C.

AU - Ahmed, A.H.

AU - Engelberg, D.L.

PY - 2012/9

Y1 - 2012/9

N2 - Atmospheric-induced corrosion tests under MgCl2 salt deposits were carried out on duplex stainless steel grade 2205 and 2507. As-received and 750°C heat-treated material conditions were investigated, and selected micro-structural sites targeted with salt-laden deposits to determine their corrosion response. Deposits were wetted under controlled climatic conditions at 80C and 40% relative humidity. Observations of micro-structural attack indicated the presence of net anodic and net cathodic sites. Ferrite was net anode with respect to austenite and hence more susceptible to atmospheric-induced corrosion in both as-received microstructures. Ferrite and ferrite/austenite interfaces were selectively attacked in heat-treated grade 2205, whereas mainly primary and secondary austenite in heat-treated grade 2507. Scanning Kelvin Probe Force Microscopy and Magnetic Force Microscopy were used to obtain high-resolution information about susceptible microstructure sites.

AB - Atmospheric-induced corrosion tests under MgCl2 salt deposits were carried out on duplex stainless steel grade 2205 and 2507. As-received and 750°C heat-treated material conditions were investigated, and selected micro-structural sites targeted with salt-laden deposits to determine their corrosion response. Deposits were wetted under controlled climatic conditions at 80C and 40% relative humidity. Observations of micro-structural attack indicated the presence of net anodic and net cathodic sites. Ferrite was net anode with respect to austenite and hence more susceptible to atmospheric-induced corrosion in both as-received microstructures. Ferrite and ferrite/austenite interfaces were selectively attacked in heat-treated grade 2205, whereas mainly primary and secondary austenite in heat-treated grade 2507. Scanning Kelvin Probe Force Microscopy and Magnetic Force Microscopy were used to obtain high-resolution information about susceptible microstructure sites.

M3 - Conference contribution

BT - EuroCorr2012

PB - European Federation of Corrosion

CY - Turkey

T2 - EuroCorr 2012

Y2 - 9 September 2012 through 20 September 2012

ER -

Effect of Microstructure on Atmospheric-Induced Corrosion of Heat-treated Grade 2205 and 2507 Duplex Stainless Steels

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