Method of electrolytic ceramic coating for metal, electrolysis solution for electrolytic ceramic coating for metal, and metallic material

摘要

The electrolysis solution for electrolytic ceramic coating includes water, a water-soluble zirconium compound, a complexing agent, carbonate ion, and at least one member selected from the group consisting of an alkali metal ion, ammonium ion and an organic alkali. Te zirconium compound is included at a concentration (X) in terms of zirconium of 0.0001 to 1 mol/L, the complexing agent is included at a concentration (Y) of 0.0001 to 0.3 mol/L, the carbonate ion is included at a concentration (Z) of 0.0002 to 4 mol/L, a ratio of the concentration (Y) of the complexing agent to the concentration (X) in terms of zirconium (Y/X) is at least 0.01, a ratio of the concentration (Z) of the carbonate ion to the concentration (X) in terms of zirconium (Z/X) is at least 2.5, and the electrolysis solution has an electrical conductivity of 0.2 to 20 S/m.

主权项

1. An electrolysis solution for electrolytic ceramic coating used in a method of electrolytic ceramic coating on metal in which at least one metal selected from the group consisting of aluminum, an aluminum alloy, magnesium, a magnesium alloy, titanium and a titanium alloy is used as an anode to anodize a surface of the anode in the electrolysis solution as glow discharge and/or arc discharge is generated to thereby form a ceramic film on the surface of the metal,
wherein the electrolysis solution comprises water, a water-soluble zirconium compound, a complexing agent, carbonate ion, and at least one member selected from the group consisting of an alkali metal ion, ammonium ion and an organic alkali, wherein the zirconium compound is included at a concentration (X) in terms of zirconium of 0.0001 to 1 mol/L, wherein the complexing agent is included at a concentration (Y) of 0.0001 to 0.3 mol/L, wherein the carbonate ion is included at a concentration (Z) of 0.0002 to 4 mol/L, wherein a ratio of the concentration (Y) of the complexing agent to the concentration (X) in terms of zirconium (Y/X) is at least 0.01, wherein a ratio of the concentration (Z) of the carbonate ion to the concentration (X) in terms of zirconium (Z/X) is at least 2.5, and wherein the electrolysis solution has an electrical conductivity of 0.2 to 20 S/m.