Another grain boundary corrosion process in sensitized stainless steel

This work investigates the intergranular corrosion of a sensitized Type 430 stainless steel in 1 N H sub 2 SO sub 4 . Once the grain boundary groove is formed by dissolution of the Cr-depleted material, a second form of localized corrosion commences within minutes and replaces the Cr-depletion mecha...

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Veröffentlicht in:Journal of the Electrochemical Society 1993-11, Vol.140 (11), p.3134-3140
Hauptverfasser: KELLY, W. K, IYER, R. N, PICKERING, H. W
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container_end_page 3140
container_issue 11
container_start_page 3134
container_title Journal of the Electrochemical Society
container_volume 140
creator KELLY, W. K
IYER, R. N
PICKERING, H. W
description This work investigates the intergranular corrosion of a sensitized Type 430 stainless steel in 1 N H sub 2 SO sub 4 . Once the grain boundary groove is formed by dissolution of the Cr-depleted material, a second form of localized corrosion commences within minutes and replaces the Cr-depletion mechanism. The second mechanism attacks both the bulk grains (of normal Cr content) and the Cr-depleted alloy. This is shown by groove widths that are much larger than the Cr-depleted zone widths. Gas bubbles, deduced to be hydrogen, egress from the grain boundary grooves, indicating a sizable potential drop within the grooves and the likelihood that the second corrosion process is caused by the IR phenomenon recently found to account for crevice corrosion in iron. The IR mechanism could also account for the observed corrosion under the lacquer at the sample edges.
doi_str_mv 10.1149/1.2220998
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Gas bubbles, deduced to be hydrogen, egress from the grain boundary grooves, indicating a sizable potential drop within the grooves and the likelihood that the second corrosion process is caused by the IR phenomenon recently found to account for crevice corrosion in iron. The IR mechanism could also account for the observed corrosion under the lacquer at the sample edges.</abstract><cop>Pennington, NJ</cop><pub>Electrochemical Society</pub><doi>10.1149/1.2220998</doi><tpages>7</tpages></addata></record>
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identifier ISSN: 0013-4651
ispartof Journal of the Electrochemical Society, 1993-11, Vol.140 (11), p.3134-3140
issn 0013-4651
1945-7111
language eng
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source Institute of Physics Journals
subjects 360105 - Metals & Alloys- Corrosion & Erosion
ALLOYS
Applied sciences
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CORROSION
Corrosion environments
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CROLOY
Exact sciences and technology
FERRITIC STEELS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
INTERGRANULAR CORROSION
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
MATERIALS
MATERIALS SCIENCE
Metals. Metallurgy
REACTION KINETICS
STAINLESS STEEL-430
STAINLESS STEELS
STEEL-CR16
STEELS
SULFURIC ACID
title Another grain boundary corrosion process in sensitized stainless steel
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