UV-Absorbing Seal Layer for Anodic Oxide Color Stability
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Solution Overview
Problem
Anodic oxides used in metal surfaces tend to fade in color when exposed to ultraviolet light due to the breakdown of chemical bonds in colorants, leading to a loss of their original color.
Innovation Solution
Incorporating ultraviolet (UV) light absorbing compounds into the anodic oxide by exposing it to a solution containing these compounds during the sealing process, which forms a UV light absorbing seal layer that blocks UV light from reaching the colorant, thereby preventing color fading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If colorants are added to anodic oxide pores to provide color, then cosmetic appearance is improved, but color stability under UV light deteriorates
Solution Approach 1:
A UV-absorbing compound is introduced as an intermediary substance within the anodic oxide pores. This compound positioned between the UV light source and the colorant absorbs harmful UV radiation, preventing it from reaching and degrading the colorant molecules, thereby maintaining color stability while preserving cosmetic appearance
Solution Approach 2:
The patent converts the harmful effect of UV light into a beneficial protective mechanism by utilizing UV-absorbing compounds that deliberately capture UV radiation. The absorbed UV energy is dissipated harmlessly, transforming what would be destructive radiation into a protective shield for the colorant
2Reliability
If UV light absorbing compounds are incorporated into anodic oxide, then color fade resistance is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent merges the UV protection function with the existing anodizing and sealing processes by incorporating UV-absorbing compounds into the sealing solution. This integration allows simultaneous achievement of pore sealing and UV protection in a single manufacturing step, avoiding the need for separate UV treatment processes
Solution Approach 2:
The sealing solution is given multi-functionality by combining pore-sealing materials with UV-absorbing compounds. This universal solution simultaneously performs both the traditional sealing function and the new UV protection function, simplifying the manufacturing process while achieving multiple objectives
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 UV light absorbing seal layer effectively protects the colorant from UV light exposure, maintaining the original color of the anodic oxide and enhancing its corrosion resistance and cosmetic appeal.
Implementation Method 1
The UV light absorbing compound is configured to absorb at least a portion of UV wavelengths of light. The incorporated UV light absorbing compound blocks at least a portion of UV light incident a top surface of the anodic oxide from reaching the colorant.
Implementation Method 2
Anodizing is an electrolytic oxidative process used to increase the thickness of a natural passive layer on a surface of a metal part, where the part to be treated forms the anode electrode of an electrical circuit.
Data Source
AI summary
The embodiments described herein relate to anodic oxides and methods for forming anodic oxides. The methods involve incorporating an ultraviolet (UV) light absorbing compounds into anodic oxides to prevent color fading of the anodic oxides caused by exposure to UV light. In some embodiments, the UV light absorbing compound includes para-aminobenzoic acid (PABA). The UV light absorbing compound can be incorporated within the anodic oxide during a sealing process. The UV light absorbing compound becomes infused within a seal layer, which is formed during the sealing process. The resultant anodic oxide has a UV light absorbing seal layer that can block UV light from reaching any underlying colorant existing within the anodic oxide.