Generating e.g. nanocrystal-containing metallic oxide and metal mixed oxide layers on barrier layer-forming metals comprises cleaning and anodically degreasing substrate in galvanic electrolysis with an aqueous electrolyte and anodizing

Generating nanocrystalline or nanocrystal-containing metallic oxide and metal mixed oxide layers on barrier layer-forming metals comprises cleaning and anodically degreasing a substrate to be coated comprising the metals, in a galvanic electrolysis with an aqueous electrolyte, anodizing the substrate in the electrolytes under spark discharge with direct current voltage and/or direct current voltage impulses and temporal change of the voltage up to a coating final voltage, washing the coated substrate after the electrolysis for the cleaning of electrolytes and then drying the substrate. Generating nanocrystalline or nanocrystal-containing metallic oxide and metal mixed oxide layers on barrier layer-forming metals comprises cleaning and anodically degreasing a substrate to be coated comprising the metals, in a galvanic electrolysis with an aqueous electrolyte, which contains at least one complexing agent, a solubilizer such as isopropanol, a titanium source such as titanium alkoxide, and buffer components, anodizing the substrate in the electrolytes under spark discharge with direct current voltage and/or direct current voltage impulses and temporal change of the voltage up to a coating final voltage, washing the coated substrate after the electrolysis for the cleaning of electrolytes and then drying the substrate, where the complexing agent is nitrilotriacetic acid and/or diethylenetriaminepentaacetic acid and by the concentration of the complexing agent and buffer components, an electrical conductivity of the electrolyte of 10-17 mScm ->1>and a pH value of 6.5-6.8 are adjusted. Aufgabe war es, unter Beibehaltung der Haftfestigkeit reproduzierbare Schichten mit in weiten Grenzen beeinflussbaren Schichteigenschaften und Spezifität aufzubringen sowie die Umweltbelastung und den wirtschaftlichen Aufwand zur Durchführung des Beschichtungsverfahrens zu verringern. Erfindungsgemäß wird eine galvanische Elektrolyse in einer speziellen Zusammensetzung des Elektrolyten vorgeschlagen, der als Komplexbildner Nitrilotriessigsäure (NTA) und/oder Diethylentriaminpentaessigsäure (DTPA) enthält. Anwendung finden derartige Schichten z.B. in der Katalyse, insbesondere Photokatalyse, sowie als Träger für makromolekulare Komplexe, beispielsweise bei Farbstoffzellen.