Invention Grant
- Patent Title: Electrolytic electrode, anode for electrolytic production of ozone, anode for electrolytic production of persulfuric acid and anode for electrolytic oxidation of chromium
- Patent Title (中): 电解电极,用于电解生产臭氧的阳极,用于电解生产过硫酸的阳极和电解氧化铬的阳极
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Application No.: US13823877Application Date: 2011-09-14
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Publication No.: US09353448B2Publication Date: 2016-05-31
- Inventor: Tsuyoshi Okazaki , Nobuyasu Ezawa
- Applicant: Tsuyoshi Okazaki , Nobuyasu Ezawa
- Applicant Address: JP Chiyoda-ku, Tokyo
- Assignee: Tanaka Kikinzoku Kogyo K.K.
- Current Assignee: Tanaka Kikinzoku Kogyo K.K.
- Current Assignee Address: JP Chiyoda-ku, Tokyo
- Agency: Orrick Herrington & Sutcliffe, LLP
- Priority: JP2010-209763 20100917
- International Application: PCT/JP2011/070972 WO 20110914
- International Announcement: WO2012/036196 WO 20120322
- Main IPC: C25B11/00
- IPC: C25B11/00 ; C25B11/04 ; C23C10/22 ; C25B1/13 ; C02F1/467 ; C25D11/38 ; C25D17/10 ; C25D11/00 ; C25B1/28 ; C02F1/78 ; C02F1/461

Abstract:
An electrolytic electrode includes an electrode surface layer formed by a high-temperature heat treatment under a low oxygen partial pressure of 100 Pa or less and includes a valve metal oxide film, the electrode surface layer having, just beneath, a layer which includes a valve metal and a noble metal excluding silver and the noble metal is precipitated and dispersed in a crystal grain boundary of the valve metal, wherein a crystal of the valve metal in a range of down to 30 μm in a vertical depth direction from the electrode surface is a crystal grain being elongated in a vertical cross-section from the electrode surface and a content of the noble metal in a range of down to 10 μm in the vertical depth direction from the electrode surface is 5 at % or less.
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