Electrochemical properties of Fe2O3-Cr 2O3 thin films and pitting behavior of Fe-Cr alloys in neutral NaCl solutions

Katsuhisa Sugimoto; Yoshiyuki Ohya; Noboru Akao; Nobuyoshi Hara

Electrochemical properties of Fe₂O₃-Cr ₂O₃ thin films and pitting behavior of Fe-Cr alloys in neutral NaCl solutions

Katsuhisa Sugimoto, Yoshiyuki Ohya, Noboru Akao, Nobuyoshi Hara

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Fe₂O₃-Cr₂O₃ thin films with various chromium cationic fractions, X_Cr, were prepared by ion-beam sputter deposition. The thinning rate of the films in 0-1M Cl -containing solutions with pH 0.2 - 8.0 was measured in-situ by using an automatic ellipsometer. The pitting behavior of vacuum induction melted Fe-Cr alloys with 10-30% Cr was also measured in IM Cl -containing solutions with pH 0.2 - 5.9. The composition of passive films on the alloys was analyzed by AES. Pit initiation sites were observed by SEM and analyzed by EPMA. The results showed pitting on the Fe-20Cr alloy in IM NaCl starts at Cr₂O₃ inclusions partly covered by sulfide. It is presumed that the X_Cr value of repassivation film formed inside a pit determines the repassivation of the pit through the suppression or no suppression of the reductive dissolution of the film.

Original language	English
Title of host publication	Pits and Pores III
Subtitle of host publication	Formation, Properties, and Significance for Advanced Materials - Proceedings of the International Symposium
Pages	194-204
Number of pages	11
Publication status	Published - 2006 Jul 20
Event	206th Electrochemical Society Meeting - Honolulu, HI, United States Duration: 2004 Oct 3 → 2004 Oct 8

Publication series

Name	Proceedings - Electrochemical Society
Volume	PV 2004-19

Other

Other	206th Electrochemical Society Meeting
Country/Territory	United States
City	Honolulu, HI
Period	04/10/3 → 04/10/8

ASJC Scopus subject areas

Engineering(all)

Cite this

Sugimoto, K., Ohya, Y., Akao, N., & Hara, N. (2006). Electrochemical properties of Fe₂O₃-Cr ₂O₃ thin films and pitting behavior of Fe-Cr alloys in neutral NaCl solutions. In Pits and Pores III: Formation, Properties, and Significance for Advanced Materials - Proceedings of the International Symposium (pp. 194-204). (Proceedings - Electrochemical Society; Vol. PV 2004-19).

Electrochemical properties of Fe₂O₃-Cr ₂O₃ thin films and pitting behavior of Fe-Cr alloys in neutral NaCl solutions. / Sugimoto, Katsuhisa; Ohya, Yoshiyuki; Akao, Noboru et al.

Pits and Pores III: Formation, Properties, and Significance for Advanced Materials - Proceedings of the International Symposium. 2006. p. 194-204 (Proceedings - Electrochemical Society; Vol. PV 2004-19).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Sugimoto, K, Ohya, Y, Akao, N & Hara, N 2006, Electrochemical properties of Fe₂O₃-Cr ₂O₃ thin films and pitting behavior of Fe-Cr alloys in neutral NaCl solutions. in Pits and Pores III: Formation, Properties, and Significance for Advanced Materials - Proceedings of the International Symposium. Proceedings - Electrochemical Society, vol. PV 2004-19, pp. 194-204, 206th Electrochemical Society Meeting, Honolulu, HI, United States, 04/10/3.

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title = "Electrochemical properties of Fe2O3-Cr 2O3 thin films and pitting behavior of Fe-Cr alloys in neutral NaCl solutions",

abstract = "Fe2O3-Cr2O3 thin films with various chromium cationic fractions, XCr, were prepared by ion-beam sputter deposition. The thinning rate of the films in 0-1M Cl -containing solutions with pH 0.2 - 8.0 was measured in-situ by using an automatic ellipsometer. The pitting behavior of vacuum induction melted Fe-Cr alloys with 10-30% Cr was also measured in IM Cl -containing solutions with pH 0.2 - 5.9. The composition of passive films on the alloys was analyzed by AES. Pit initiation sites were observed by SEM and analyzed by EPMA. The results showed pitting on the Fe-20Cr alloy in IM NaCl starts at Cr2O3 inclusions partly covered by sulfide. It is presumed that the XCr value of repassivation film formed inside a pit determines the repassivation of the pit through the suppression or no suppression of the reductive dissolution of the film.",

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T1 - Electrochemical properties of Fe2O3-Cr 2O3 thin films and pitting behavior of Fe-Cr alloys in neutral NaCl solutions

AU - Sugimoto, Katsuhisa

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AU - Hara, Nobuyoshi

PY - 2006/7/20

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N2 - Fe2O3-Cr2O3 thin films with various chromium cationic fractions, XCr, were prepared by ion-beam sputter deposition. The thinning rate of the films in 0-1M Cl -containing solutions with pH 0.2 - 8.0 was measured in-situ by using an automatic ellipsometer. The pitting behavior of vacuum induction melted Fe-Cr alloys with 10-30% Cr was also measured in IM Cl -containing solutions with pH 0.2 - 5.9. The composition of passive films on the alloys was analyzed by AES. Pit initiation sites were observed by SEM and analyzed by EPMA. The results showed pitting on the Fe-20Cr alloy in IM NaCl starts at Cr2O3 inclusions partly covered by sulfide. It is presumed that the XCr value of repassivation film formed inside a pit determines the repassivation of the pit through the suppression or no suppression of the reductive dissolution of the film.

AB - Fe2O3-Cr2O3 thin films with various chromium cationic fractions, XCr, were prepared by ion-beam sputter deposition. The thinning rate of the films in 0-1M Cl -containing solutions with pH 0.2 - 8.0 was measured in-situ by using an automatic ellipsometer. The pitting behavior of vacuum induction melted Fe-Cr alloys with 10-30% Cr was also measured in IM Cl -containing solutions with pH 0.2 - 5.9. The composition of passive films on the alloys was analyzed by AES. Pit initiation sites were observed by SEM and analyzed by EPMA. The results showed pitting on the Fe-20Cr alloy in IM NaCl starts at Cr2O3 inclusions partly covered by sulfide. It is presumed that the XCr value of repassivation film formed inside a pit determines the repassivation of the pit through the suppression or no suppression of the reductive dissolution of the film.

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