2000
DOI: 10.1149/1.1394028
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Scanning Electrochemical Microscopy Detection of Dissolved Sulfur Species from Inclusions in Stainless Steel

Abstract: The dissolution of MnS inclusions in stainless steels (SS) 303 and 304 during initiation of pitting corrosion in an aqueous solution containing 10 mM KI and 0.1 M NaCl was investigated with use of a scanning electrochemical microscope (SECM). The dissolution products of MnS were detected amperometrically at a carbon fiber SECM tip using I Ϫ /I 3 Ϫ as the redox mediator. SECM images showed that the sulfur species are slowly generated above previously identified MnS inclusions. The SECM tip current was stable up… Show more

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Cited by 120 publications
(75 citation statements)
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“…The extremely high local chloride concentration promotes the depassivation of the surrounding steel substrate, and pitting thus proceeds extremely fast in the vicinity of the inclusions. Similar observations were made by Paik et al [201] who generated I 3 -at a carbon fiber UME from a KI solution. The I 3 -ions are reduced to I -by sulfur-containing compounds (HS -, S 2 O 3 2-) being released from the MnS inclusions, and a spatially resolved detection of these species is thus possible at the UME as i T increases due to higher I -concentrations (Figure 23a).…”
Section: Investigation Of Precursor Regionssupporting
confidence: 85%
See 1 more Smart Citation
“…The extremely high local chloride concentration promotes the depassivation of the surrounding steel substrate, and pitting thus proceeds extremely fast in the vicinity of the inclusions. Similar observations were made by Paik et al [201] who generated I 3 -at a carbon fiber UME from a KI solution. The I 3 -ions are reduced to I -by sulfur-containing compounds (HS -, S 2 O 3 2-) being released from the MnS inclusions, and a spatially resolved detection of these species is thus possible at the UME as i T increases due to higher I -concentrations (Figure 23a).…”
Section: Investigation Of Precursor Regionssupporting
confidence: 85%
“…It complements other scanning probe techniques such as the scanning reference electrode technique (SRET) [178,179], conductive scanning force microcopy (CSFM), electrochemical scanning tunneling microscopy (ECSTM), and scanning Kelvin probe techniques which are popular methods for the investigation of functional materials [180]. Basic experimental approaches include the imaging of the permeability of applied protective coatings [181][182][183][184][185][186][187][188][189][190][191][192][193], the imaging of regions with distinctly higher electron transfer rates which may be precursor sites for pitting corrosion [29,57,[194][195][196][197][198][199][200][201][202][203][204][205][206][207], the initiation of pitting corrosion by local generation of aggressive species at the UME [208,209] and the detection of active corrosion by collecting released species [55,58,60,104,[210][211][212][213][214]…”
Section: Localized Corrosionmentioning
confidence: 99%
“…Alkire et coll. [16] qui ont permis de tester les différentes hypothèses relatives au mode de dissolution des inclusion de MnS (ces inclusions contenant par ailleurs des éléments métalliques) afin de définir quelle espèce chimique soufrée était responsable de la corrosion par piqûre des aciers inoxydables associée à la dissolution des inclusions de MnS. Dans ce cas l'électrode-sonde du SECM était une fibre de carbone et le médiateur le couple (iodure/iodate) I 3− /I − .…”
Section: Mesures Ampérométriques : Le Microscope éLectrochimique (Secunclassified
“…Paik and Alkire [93] introduced a similar approach for investigation of sulfidic inclusions on Ni (200). By reaction with I À 3 that is formed at the UME, sulfur-containing compounds can be detected electrochemically as they are released from such inclusions [96]. This approach was expanded by Lister and Pinhero to measurement of the local electric field strength [83] and to studies using a microelectrode array [97].…”
Section: Metalsmentioning
confidence: 99%