Electrochemical and Corrosion Properties of Fe[sub 2]O[sub 3]-Cr[sub 2]O[sub 3]-MoO[sub 2] Artificial Passivation Films in HCl Solutions

Son, Myungsook; Akao, Noboru; Hara, Nobuyoshi; Sugimoto, Katsuhisa

doi:10.1149/1.1344531

Cited by 15 publications

(6 citation statements)

References 69 publications

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“…The substance of the defects and the breakdown mechanism of passive films are still unclear. The reductive dissolution of the Fe 2 O 3 -component in passive films is considered to lead to passive film breakdown, which results in deeper corrosion in the substrate [39,40]. The passive film adheres loosely on the surface and can be spalled from the substrate surface.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical investigation of stainless steel corrosion in a proton exchange membrane electrolyzer cell

Steen

Zhang

et al. 2015

International Journal of Hydrogen Energy

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Available online xxxKeywords: Corrosion Membrane electrode assembly Proton exchange membrane electrolyzer/fuel cells Gas diffusion layer X-ray diffraction Iron transport and deposition a b s t r a c t The lack of a fundamental understanding of the corrosion mechanisms in the electrochemical environments of proton exchange membrane (PEM) electrolyzer and/or fuel cells (ECs/FCs) has seriously hindered the improvement of performance and efficiency of PEM ECs/FCs. In this study, a stainless steel mesh was purposely used as an anode gas diffusion layer that was intentionally operated with high positive potentials under harsh oxidative environments in a PEMEC to study the corrosion mechanism of metal migration. A significant amount of iron and nickel cations were determined to transport through the anode catalyst layer, the PEM and the cathode catalyst layer during the PEMEC operation. The formation/deposition of iron oxide and nickel oxide on the carbon paper gas diffusion layer at the cathode side is first revealed by both scanning electron microscope and X-ray diffraction. The results indicate the corrosion elements of iron and nickel are transported from anode to cathode through the catalyst-coated membrane, and deposited on carbon fibers as oxides. This phenomenon could also open a new corrosion-based processing approach to potentially fabricate multifunctional oxide structures on carbon fiber devices. This study has demonstrated a new accelerated test method for investigating the corrosion and durability of metallic materials as well. ScienceDirect j o urn al h om epa ge: www.elsev ier.com/locate/he i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y x x x ( 2 0 1 5 ) 1 e6 http://dx.Please cite this article in press as: Mo J, et al., Electrochemical investigation of stainless steel corrosion in a proton exchange membrane electrolyzer cell, International Journal of Hydrogen Energy (2015), http://dx.

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Section: Resultsmentioning

confidence: 99%

Electrochemical investigation of stainless steel corrosion in a proton exchange membrane electrolyzer cell

Steen

Zhang

et al. 2015

International Journal of Hydrogen Energy

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“…Consequently, IBSD is widely used for the formation of highquality metal, alloy, or oxide thin films. [3][4][5][6][7][8][9][10] However, most research has been engaged with characteristics of the films; a very few research projects have been concerned with the formation process of the films.…”

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confidence: 99%

“…It provides nondestructive optical measurements in a vacuum, gases, and solutions. Because of these features, ellipsometry has been used for in situ analysis of the oxidation and reduction processes of metals and alloys in aqueous solutions, [10][11][12][13][14][15][16][17] the formation process of oxide films by chemical vapor deposition, [18][19][20][21][22] and that of metal, oxide, nitride, and carbide films by physical vapor deposition. [23][24][25][26][27][28][29][30] Several reports are available for ellipsometric analyses of the formation process of thin films by magnetron sputtering.…”

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confidence: 99%

In Situ Ellipsometry Analysis on Formation Process of Al[sub 2]O[sub 3]-Ta[sub 2]O[sub 5] Films in Ion Beam Sputter Deposition

Kaneko

Akao

Hara

et al. 2005

J. Electrochem. Soc.

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Al 2 O 3 -Ta 2 O 5 thin films are known as highly corrosion-resistant materials for coatings. Here the formation process of Al 2 O 3 -Ta 2 O 5 films was analyzed by in situ ellipsometry during deposition by ion beam sputtering. Composite targets composed of Al 2 O 3 and Ta 2 O 5 plates were used for sputter deposition. During deposition, the formation process of thin films was monitored by a single-wavelength rotating analyzer ellipsometer attached to the sputtering system. The composition, the chemical binding states of constituent elements, and the depth profile of the elements of the films were analyzed by inductively coupled plasma-atomic emission spectroscopy, X-ray photoelectron spectroscopy ͑XPS͒, and auger-electron spectroscopy ͑AES͒, respectively. Ellipsometric analysis showed that the thickness of the film increased linearly with time after short induction periods. The refractive index of the films increases with increasing tantalum cationic fraction. The extinction coefficient of the films was larger than those of single Al 2 O 3 and Ta 2 O 5 films. The XPS analysis showed that the preferential deposition of the Ta 2 O 5 component occurred in the induction period and the codeposition of Ta 2 O 5 and Al 2 O 3 in the linear growth stage. The AES analysis showed that the content of constituent elements was homogeneous from the top to the bottom of the films in the linear growth stage.In ion beam sputter deposition ͑IBSD͒, 1,2 target materials are sputtered by inert gas ions, such as Ar + ions, from an ion gun, and sputtered particles are deposited on a substrate to form a film. Advantages of IBSD are that the film is scarcely irradiated by highenergy particles generated in a plasma area and is formed under relatively high vacuum. Because of these advantages, the film formed is free from irradiation damages and absorption of process gas. Consequently, IBSD is widely used for the formation of highquality metal, alloy, or oxide thin films. 3-10 However, most research has been engaged with characteristics of the films; a very few research projects have been concerned with the formation process of the films.Ellipsometry is a sensitive method for analyzing changes in the thickness and optical constant of surface films. It provides nondestructive optical measurements in a vacuum, gases, and solutions. Because of these features, ellipsometry has been used for in situ analysis of the oxidation and reduction processes of metals and alloys in aqueous solutions, 10-17 the formation process of oxide films by chemical vapor deposition, [18][19][20][21][22] and that of metal, oxide, nitride, and carbide films by physical vapor deposition. [23][24][25][26][27][28][29][30] Several reports are available for ellipsometric analyses of the formation process of thin films by magnetron sputtering. Aouadi et al. 23 analyzed the formation of Inconel/carbon multilayer films on a Si substrate. Lee et al. 24,25 studied the initial stage of growth of Au thin films on heat-oxidized Si substrates. Vergohl et al. 26 reported the process...

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“…The authors have studied the electrochemical and corrosion nature of oxide ultrathin films which simulate passive films on ferritic and austenitic stainless steels ͑SS͒ and those on valve metals and alloys. For example, Fe 2 O 3 -Cr 2 O 3 , [1][2][3][4] Fe 2 O 3 -Cr 2 O 3 -NiO, 1,2 and Fe 2 O 3 -Cr 2 O 3 -MoO 2 5 films were employed as analogs of the former and Al 2 O 3 , 6,7 TiO 2 , 8,9 ZrO 2 , [10][11][12] Ta 2 O 5 , [13][14][15] SiO 2 , 16,17 and Nb 2 O 5 , 18 Al 2 O 3 -Ta 2 O 5 -ZrO 2 , 19 Al 2 O 3 -ZrO 2 , 20 Ta 2 O 5 -ZrO 2 , 21 TiO 2 -ZrO 2 22 films as those of the latter. Multilayer films 23,24 composed of some oxides, such as Cr 2 O 3 /Al 2 O 3 /Cr 2 O 3 /Al 2 O 3 , 23 Ta 2 O 5 /Al 2 O 3 , 24 Ta 2 O 5 /Cr 2 O 3 /Al 2 O 3 , 24 have been examined also.…”

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confidence: 99%

Self-healing Corrosion Protection Ability of Composition-Gradient Al[sub 2]O[sub 3]⋅Nb Nanocomposite Thin Films

Yasuda

Akao

Hara

et al. 2003

J. Electrochem. Soc.

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Al 2 O 3 •Nb nanocomposite thin films have been known as films having self-healing corrosion protection ability. To attain high self-healing ability and low pinhole defect density, the optimization of composition and structure of the films has been examined. The films were prepared on an Fe thin film substrate on a glass slide using ion beam sputter deposition technique. The self-healing ability of the films was evaluated by the repassivation behavior of potential and current of specimens coupled with an Au auxiliary electrode just after scratching by a knife edge in 0.1 M NaCl. Microscopic observation showed that the pinhole defect density increased with increasing Nb content. Therefore, to use the films as corrosion-protection coatings, decreasing Nb content would be needed for decreasing pinhole defect density but increasing Nb content for increasing self-healing ability. To solve this contradiction, composition-gradient Al 2 O 3 •Nb films were introduced. The composition-gradient film with increasing Nb content from the film surface to the substrate interface showed low pinhole defect density and high self-healing ability. A three-layer film of Al 2 O 3 ͑outer͒/composition-gradient Al 2 O 3 •Nb ͑middle͒/Nb ͑inner͒ gave the best result.

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Electrochemical and Corrosion Properties of Fe[sub 2]O[sub 3]-Cr[sub 2]O[sub 3]-MoO[sub 2] Artificial Passivation Films in HCl Solutions

Cited by 15 publications

References 69 publications

Electrochemical investigation of stainless steel corrosion in a proton exchange membrane electrolyzer cell

Electrochemical investigation of stainless steel corrosion in a proton exchange membrane electrolyzer cell

In Situ Ellipsometry Analysis on Formation Process of Al[sub 2]O[sub 3]-Ta[sub 2]O[sub 5] Films in Ion Beam Sputter Deposition

Self-healing Corrosion Protection Ability of Composition-Gradient Al[sub 2]O[sub 3]⋅Nb Nanocomposite Thin Films

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