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Ono, Kiyoo; Kohno, Tomio

doi:10.4262/denkiseiko.51.122

Cited by 12 publications

(12 citation statements)

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“…5c, the dissolution of the CrS inclusions started at around 1 V. The dissolution potential of CrS inclusions is higher than that of MnS inclusions. This result is consistent with observations made by other researchers, 23,26 and indicates why the stainless steels containing CrS inclusions have higher pitting potentials than those containing MnS or (Mn,Cr)S inclusions. …”

Section: Dissolution Potential For Crs Inclusionssupporting

confidence: 95%

Microelectrochemistry on CrS and MnS Inclusions and Its Relation with Pitting Potentials of Stainless Steels

Muto¹,

Kurokawa

Hara

2009

ECS Trans.

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The anodic dissolution behavior of CrS inclusions was compared with that of MnS inclusions containing around 10 at% Cr, (Mn,Cr)S, using a microelectrochemical cell in NaCl solutions. CrS inclusions were resistant to pit initiation compared with (Mn,Cr)S inclusions. The dissolution potential of CrS inclusions was found to be in the transpassive region of stainless steels. Stable pits were initiated in this potential region. (Mn,Cr)S inclusions dissolved in the passive region of stainless steels, providing lower pitting potentials than those of CrS-containing stainless steels. AES analysis of the surface films on CrS inclusions indicated that chromium-containing oxide films were formed on the CrS inclusions and grew with electrode potential, which suggested the oxide films on CrS inclusions prevented the anodic dissolution of the inclusions, thereby leading to an increased resistance to pit initiation.

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Section: Dissolution Potential For Crs Inclusionssupporting

confidence: 95%

Microelectrochemistry on CrS and MnS Inclusions and Its Relation with Pitting Potentials of Stainless Steels

Muto¹,

Kurokawa

Hara

2009

ECS Trans.

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“…Many other researchers also reported that chromium-enriched inclusions are more corrosion resistant to pit initiation than MnS inclusions. [22][23][24][25][26][27][28] One possible reason for this is the difference in the solubility of the inclusions. CrS inclusions are either completely insoluble or poorly soluble in water: MnS inclusions are, however, soluble and release corrosive sulfur species in the process of dissolution.…”

mentioning

confidence: 99%

Microelectrochemical Investigation of Anodic Polarization Behavior of CrS Inclusions in Stainless Steels

Muto

Kurokawa

Hara

2009

J. Electrochem. Soc.

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The anodic dissolution behavior of CrS inclusions was compared with that of (Mn,Cr)S inclusions containing around 10 atom % Cr using a microelectrochemical cell in NaCl solutions. CrS inclusions were resistant to pit initiation compared with (Mn,Cr)S inclusions. The dissolution potential of CrS inclusions was in the transpassive region of stainless steels. Stable pits were initiated in this potential region. (Mn,Cr)S inclusions dissolved in the passive region of stainless steels, providing lower pitting potentials than those of CrS-containing stainless steels. Auger electron spectroscopy analysis indicated that chromium-containing oxide films were formed on the CrS inclusions and grew with electrode potential, which suggested that the oxide films on CrS inclusions prevented the anodic dissolution of the inclusions, thereby leading to an increased resistance to pit initiation.

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“…There have also been reports on the improvement of corrosion resistance resulting from the decreasing Mn/S ratio in stainless steel consequent with increasing Cr content in sulfide. [7][8][9] The present work is one of a series of systematic studies [9][10][11][16][17][18][19][20][21][22] on the phase equilibria and the morphology of various sulfides in metals, which focuses on the microstructural features of CrS in the Fe-Cr-S ternary system. In particular, a confocal scanning laser microscope (CSLM) with infrared image furnace was utilized for direct investigation of the microstructure at high temperature.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the introduction and modification of inclusions have also received a great deal of attention as a new technique for improving the mechanical properties of steel. [1][2][3][4][5][6][7][8][9] For instance, since manganese sulfide acts as a heterogeneous nucleation site of intragranular ferrite, it is used for refining the ferritic structure 3,4) and for improving the toughness in the heat-affected zone (HAZ) of the weld metal. 5) Furthermore, it is well-known that MnS inclusion improves the machinability of steels.…”

Section: Introductionmentioning

confidence: 99%

Morphology of Sulfide Formed in the Fe-Cr-S Ternary Alloys.

et al. 2002

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The evolution of sulfide morphology in the Fe-(0.3-18)mass%Cr-(0.05-0.3)mass%S alloys during solidification and heat treatment was investigated by means of optical microscopy, scanning electron microscopy, analytical electron microscopy and X-ray diffraction. In situ observation of the formation of the fine particle sulfide was also conducted at elevated temperatures by confocal scanning laser microscopy. The morphology of sulfide in the Fe-Cr-S ternary alloys was found to change from a cell wall type to a globular type with increasing Cr content. Accompanying the phase transformation of the matrix from the d phase to the g phase, two types of transgranular fine particle sulfide were formed. One is a fine spherical sulfide formed from the FeS-rich liquid phase through the remelting reaction of d→gϩLiq. in less than 5 mass% Cr alloys, and the other is a fine rod-like sulfide formed through the eutectoid reaction of d→gϩsulfide in 5 to 13 mass% Cr alloys. The formation mechanism of various types of sulfide morphology was examined based on phase diagram information.KEY WORDS: sulfide morphology; in situ observation; mechanism of sulfide formation; phase diagram; stainless steel.

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Cited by 12 publications

References 0 publications

Microelectrochemistry on CrS and MnS Inclusions and Its Relation with Pitting Potentials of Stainless Steels

Microelectrochemistry on CrS and MnS Inclusions and Its Relation with Pitting Potentials of Stainless Steels

Microelectrochemical Investigation of Anodic Polarization Behavior of CrS Inclusions in Stainless Steels

Morphology of Sulfide Formed in the Fe-Cr-S Ternary Alloys.

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