Study of the sensitisation of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), by means of scanning electrochemical microscopy

R. Leiva-García; R. Akid; D. Greenfield; J. Gittens; M.J. Muñoz-Portero; J. García-Antón

Study of the sensitisation of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), by means of scanning electrochemical microscopy

R. Leiva-García
, R. Akid
, D. Greenfield
, J. Gittens
, M.J. Muñoz-Portero
, J. García-Antón

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

Abstract

The feedback mode of a scanning electrochemical microscope (SECM) was applied to study differences in the reactivity of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), in its unsensitised and sensitised state. Alloy 926 was heated at 825◦C for 1h in an inert atmosphere in order to produce a sensitised metallurgical condition. Sensitisation was due to chromium carbide formation at the grain boundaries. The oxygen reduction reaction was used as an indicator to monitor the effect of the sen- sitisation process on the corrosion activity of the Alloy 926 surface in a 35 g l−1 NaCl solution. Higher oxygen consumption was observed above the sensitised sample than above the unsensitised sample due to differences in the oxide films of the two alloy conditions.

Original language	English
Pages (from-to)	105-111
Number of pages	6
Journal	Electrochimica Acta
Volume	70
Publication status	Published - 30 May 2012

Keywords

Scanning electrochemical microscopy
Austenitic stainless steel
Sensitisation
Intergranular corrosion

Cite this

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title = "Study of the sensitisation of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), by means of scanning electrochemical microscopy",

abstract = "The feedback mode of a scanning electrochemical microscope (SECM) was applied to study differences in the reactivity of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), in its unsensitised and sensitised state. Alloy 926 was heated at 825◦C for 1h in an inert atmosphere in order to produce a sensitised metallurgical condition. Sensitisation was due to chromium carbide formation at the grain boundaries. The oxygen reduction reaction was used as an indicator to monitor the effect of the sen- sitisation process on the corrosion activity of the Alloy 926 surface in a 35 g l−1 NaCl solution. Higher oxygen consumption was observed above the sensitised sample than above the unsensitised sample due to differences in the oxide films of the two alloy conditions.",

keywords = "Scanning electrochemical microscopy, Austenitic stainless steel, Sensitisation, Intergranular corrosion",

author = "R. Leiva-Garc{\'i}a and R. Akid and D. Greenfield and J. Gittens and M.J. Mu{\~n}oz-Portero and J. Garc{\'i}a-Ant{\'o}n",

year = "2012",

month = may,

day = "30",

language = "English",

volume = "70",

pages = "105--111",

journal = "Electrochimica Acta",

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TY - JOUR

T1 - Study of the sensitisation of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), by means of scanning electrochemical microscopy

AU - Leiva-García, R.

AU - Akid, R.

AU - Greenfield, D.

AU - Gittens, J.

AU - Muñoz-Portero, M.J.

AU - García-Antón, J.

PY - 2012/5/30

Y1 - 2012/5/30

N2 - The feedback mode of a scanning electrochemical microscope (SECM) was applied to study differences in the reactivity of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), in its unsensitised and sensitised state. Alloy 926 was heated at 825◦C for 1h in an inert atmosphere in order to produce a sensitised metallurgical condition. Sensitisation was due to chromium carbide formation at the grain boundaries. The oxygen reduction reaction was used as an indicator to monitor the effect of the sen- sitisation process on the corrosion activity of the Alloy 926 surface in a 35 g l−1 NaCl solution. Higher oxygen consumption was observed above the sensitised sample than above the unsensitised sample due to differences in the oxide films of the two alloy conditions.

AB - The feedback mode of a scanning electrochemical microscope (SECM) was applied to study differences in the reactivity of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), in its unsensitised and sensitised state. Alloy 926 was heated at 825◦C for 1h in an inert atmosphere in order to produce a sensitised metallurgical condition. Sensitisation was due to chromium carbide formation at the grain boundaries. The oxygen reduction reaction was used as an indicator to monitor the effect of the sen- sitisation process on the corrosion activity of the Alloy 926 surface in a 35 g l−1 NaCl solution. Higher oxygen consumption was observed above the sensitised sample than above the unsensitised sample due to differences in the oxide films of the two alloy conditions.

KW - Scanning electrochemical microscopy

KW - Austenitic stainless steel

KW - Sensitisation

KW - Intergranular corrosion

M3 - Article

SN - 0013-4686

VL - 70

SP - 105

EP - 111

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -

Study of the sensitisation of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), by means of scanning electrochemical microscopy

Abstract

Keywords

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