Electrolytic electrode, anode for electrolytic production of ozone, anode for electrolytic production of persulfuric acid and anode for electrolytic oxidation of chromium
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United States of America Patent
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May 31, 2016
Grant Date -
Jul 11, 2013
app pub date -
Sep 14, 2011
filing date -
Sep 17, 2010
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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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