Patent ID: 7842353

Claim:
A process for manufacturing electrodes for electrolysis, comprising the steps of: forming an arc ion plating undercoating layer comprising valve metal comprising a crystalline tantalum component and a crystalline titanium component or valve metal alloy comprising a crystalline tantalum component and a crystalline titanium component on a surface of an electrode substrate comprising valve metal or valve metal alloy, by an arc ion plating method; heat sintering, comprising coating a metal compound solution, comprising one or more of titanium, tantalum, niobium, zirconium, hafnium, vanadium, molybdenum, and tungsten, onto a surface of said arc ion plating undercoating layer, followed by heat sintering to transform only said tantalum component of said arc ion plating undercoating layer into an amorphous substance, and to form an oxide interlayer, comprising an oxide of one or more of titanium, tantalum, niobium, zirconium, hafnium, vanadium, molybdenum, and tungsten, on said surface of said arc ion plating undercoating layer containing said transformed amorphous tantalum component and said crystalline titanium component; and forming an electrode catalyst layer for electrolysis, said electrode catalyst layer comprising one or more of precious metals and precious metal oxides, on a surface of said oxide interlayer.