Stripping of coatings Al-containing coatings
AssigneeOerlikon Surface Solutions AG, PfäFfikon
InventorsAnders Olof Eriksson, Sebastian Benedikt, Vadim Schott
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Abstract
Method for stripping a coating from a coated surface of a substrate, wherein the coating is stripped in an aqueous alkaline solution, characterized in that the method comprises following steps:—preparing the coated substrate to be decoated by providing the substrate with a strippable coating by depositing a coating comprising one or more layers, wherein one layer comprising aluminum is deposited directly on the substrate surface to be decoated and—introducting the substrate to be decoated in the aqueous alkaline solution, thereby conducting a chemical stripping of the coating from the substrate, whereas the aqueous alkaline solution comprises NaOH in a concentration in weight percentage from 30 wt. % to 50 wt. %.
Claims9
A method for stripping a coating from a coated surface of a substrate, wherein the coating is stripped in an aqueous alkaline solution, the method comprising the following steps:
- preparing the coated substrate to be decoated by providing the substrate with a strippable coating by depositing a coating comprising one or more layers, wherein one layer comprising aluminum is deposited directly on the substrate surface to be decoated;
- and
- introducing the substrate to be decoated in the aqueous alkaline solution, thereby conducting a chemical stripping of the coating from the substrate, wherein the aqueous alkaline solution comprises NaOH in a concentration in weight percentage from 30 wt. % to 50 wt. %, and wherein the substrate is connected to a sacrificial anode for conducting the chemical stripping process, and the material of the sacrificial anode is selected having lower electrochemical potential than the material of the substrate to be decoated, or having lower electrochemical potential than material constituents contained in the substrate to be decoated that can be dissolved during chemical stripping.
A method for stripping a coating from a coated surface of a substrate, wherein the coating is stripped in an aqueous alkaline solution, the method comprising the following steps:
- preparing the coated substrate to be decoated by providing the substrate with a strippable coating by depositing a coating comprising one or more layers, wherein one layer comprising aluminum is deposited directly on the substrate surface to be decoated using a physical vapor deposition process, and before conducting the deposition process a blasting media comprising alumina is used for blasting one or more cathodes that are used as a coating material source for depositing said layer directly on the substrate;
- and
- introducing the substrate to be decoated in the aqueous alkaline solution, thereby conducting a chemical stripping of the coating from the substrate, wherein the aqueous alkaline solution comprises NaOH in a concentration in weight percentage from 30 wt. % to 50 wt. %.
Dependencies are inferred from the claim text.