Colored Metallic Coating via Alkaline Anodic Oxidation
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Solution Overview
Problem
Existing methods for producing colored surfaces using anodic oxidation of thin metallic layers in acid electrolytes often result in poor surface quality, undefined color, and corrosion, making them unsuitable for producing high-quality coatings with high specular reflection gloss.
Innovation Solution
A method involving the deposition of a metallic layer on a substrate body within a vacuum coating chamber, followed by anodic oxidation in an alkaline electrolyte bath to form a colored oxide layer, which achieves high specular reflection gloss and reproducible surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anodic oxidation is performed in an acid electrolyte bath on thin metallic layers, then a colored oxide layer can be formed, but the surface quality deteriorates with corrosion and dissolution damage
Solution Approach 1:
The patent changes the chemical parameter of the electrolyte from acidic to alkaline environment. This fundamental parameter change transforms the anodic oxidation process to prevent corrosion and dissolution of the thin metallic layer while still forming the desired colored oxide layer, directly resolving the technical contradiction between achieving coloration and maintaining surface quality
Solution Approach 2:
The patent converts the harmful effect of alkaline electrolytes (which typically cause corrosion) into a beneficial process. By carefully controlling the alkaline anodic oxidation, the process now protects the metallic layer while forming a high-quality colored oxide layer, turning what would normally be a harmful chemical environment into a protective and color-forming process
2Manufacturing precision
If anodic oxidation is used to produce colored surfaces, then coloration is achieved, but the color definition and gloss quality are insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing multiple process variables including electrolyte composition, temperature, voltage, and time. These controlled parameter changes enable precise control over oxide layer formation, achieving both well-defined colors and high visual quality with excellent gloss, directly resolving the contradiction between color definition and visual quality
3Strength
If acid electrolyte anodic oxidation is applied to thin metallic layers, then oxide layer formation occurs, but the metallic layer suffers dissolution damage
Solution Approach 1:
The patent fundamentally changes the chemical environment parameter from acidic to alkaline electrolyte. This parameter change enables oxide layer formation through controlled anodic oxidation while completely preventing the dissolution and loss of the thin metallic layer, as the alkaline environment is non-corrosive to the underlying metal substrate
Solution Approach 2:
The alkaline electrolyte acts as an intermediary medium that facilitates oxide layer formation without causing damage to the metallic layer. The controlled alkaline environment mediates between the need for oxidation (to form color) and the need to protect the underlying metal from dissolution, enabling both objectives to be achieved simultaneously
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables the production of coated substrate bodies with well-defined colors and high specular reflection gloss, providing a reliable and flexible solution for various applications, including identification and decorative purposes.
Implementation Method 1
Physical Vapor Deposition (PVD) coatings are currently applied for providing improved surface properties to different kind of substrate bodies
Implementation Method 2
forming a colored oxide layer exhibiting a colored surface by anodic oxidation of the metallic layer, wherein the anodic oxidation takes place in an alkaline electrolyte bath
Data Source
AI summary
The present invention relates to a method for producing coated substrate bodies, wherein a plurality of substrate bodies comprising surfaces to be coated are provided with a colored coating surface, the method comprising following steps:providing the substrate bodies to be coated in the interior of a vacuum coating chamber,depositing a coating on a surface of the substrate bodies to be coated, the deposition of the coating involving the deposition of a metallic layer comprising at least two different metals,forming a colored oxide layer exhibiting a colored surface by anodic oxidation of the metallic layer,wherein:the anodic oxidation takes place in an alkaline electrolyte bath with the coated substrate bodies connected as anodes.