US 12,320,026 B2
Method for producing coating with colored surface
Sven Matthias Twardy, Mainz (DE); Jens Eggemann, Bad Kreuznach (DE); Erik Albert, Ingelheim (DE); Christian Becker, Bingen (DE); and Denis Kurapov, Walenstadt (CH)
Assigned to Oerlikon Surface Solutions AG, Pfäffikon, Pfäffikon (CH)
Appl. No. 16/647,689
Filed by Oerlikon Surface Solutions AG, Pfäffikon, Pfäffikon (CH)
PCT Filed Sep. 17, 2018, PCT No. PCT/EP2018/075057
§ 371(c)(1), (2) Date Mar. 16, 2020,
PCT Pub. No. WO2019/053254, PCT Pub. Date Mar. 21, 2019.
Claims priority of application No. 1151/17 (CH), filed on Sep. 15, 2017.
Prior Publication US 2020/0277707 A1, Sep. 3, 2020
Int. Cl. C25D 11/14 (2006.01); C23C 14/32 (2006.01); C23C 14/35 (2006.01); C23C 14/58 (2006.01); C25D 11/06 (2006.01); C25D 11/26 (2006.01)
CPC C25D 11/14 (2013.01) [C23C 14/325 (2013.01); C23C 14/35 (2013.01); C23C 14/5853 (2013.01); C25D 11/06 (2013.01); C25D 11/26 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for producing coated substrate bodies having a colored coating surface, the method comprising:
a) providing one substrate body or a plurality of substrate bodies comprising one or more substrate surfaces to be coated in an interior of a vacuum coating chamber,
b) after execution of step a), depositing a coating on the one or more substrate surfaces to be coated, wherein the deposition of the coating involves depositing at least one non-metallic layer on the one or more substrate surfaces to be coated, and depositing a single metallic layer directly on the at least one non-metallic layer as a top layer using HiPIMS techniques,
c) after execution of step b), forming a colored oxide layer exhibiting the colored coating surface by anodic oxidation of the metallic layer, wherein the colored coating surface has homogeneous optical properties,
wherein:
the anodic oxidation takes place in an alkaline electrolyte bath having a pH value between 12.5 and 13.5, wherein the one or more substrate surfaces to be coated are connected as anodes and the alkaline electrolyte bath is an aqueous sodium hydroxide solution having a NaOH concentration not lower than 0.5 and not higher than 0.6 in weight percentage;
the metallic layer consists of:
aluminum and titanium (AlTi), or
an AlTi alloy, or
titanium and silicon (TiSi),
wherein the at least one non-metallic layer is a functional layer of the type nitride, carbide, carbonitride, oxide, oxynitride or carboxynitride.