Multi-Colored Metal Finish Layers Without Nickel Exposure
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Solution Overview
Problem
Existing methods for creating multi-colored metal finishes often require mechanical abrasion, exposing nickel layers that need protective topcoats or fail to achieve desired color contrast, making them unsuitable for automotive applications.
Innovation Solution
A method involving electroplating and laser ablation is used to create multi-colored metal surfaces by depositing multiple metal layers on a plateable substrate and selectively removing portions of the outermost layer using laser ablation to expose underlying layers, creating varying colors and appearances without exposing nickel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If mechanical abrasion (brushing) is used to expose nickel layer for color contrast, then multi-colored appearance is achieved, but the exposed nickel layer is subject to excessive corrosion and fails automotive specifications
Solution Approach 1:
The patent divides the protective chrome layer into multiple discrete recesses that expose nickel only in specific localized areas rather than creating continuous exposed channels. This segmentation allows color contrast where needed while maintaining protective coverage in other areas, resolving the contradiction between visual effect and corrosion resistance.
Solution Approach 2:
The patent applies different surface treatments to different locations: laser ablation creates discrete recesses exposing nickel for color contrast in specific patterns, while the majority of the surface retains the continuous chrome protective layer. This local differentiation achieves color contrast without compromising overall corrosion resistance.
2Reliability
If laser ablation is used over thick chrome surface to create channels, then nickel layer is protected from exposure, but the result lacks color contrast that exposed nickel would provide
Solution Approach 1:
The patent applies laser ablation partially - not across the entire surface but only in specific recesses where color contrast is desired. This partial action exposes nickel locally for visual effect while leaving the majority of the chrome layer intact for protection, resolving the contradiction between corrosion resistance and color contrast.
3Reliability
If transparent topcoat is applied to seal exposed nickel finish, then corrosion protection is achieved, but the complexity of the process increases and additional layers are required
Solution Approach 1:
The patent performs preliminary action by strategically designing the laser ablation pattern to expose nickel only in areas where visual effect is desired, while maintaining continuous chrome coverage in areas requiring protection. This preliminary design eliminates the need for subsequent topcoat sealing steps, reducing process complexity while maintaining both aesthetic and protective functions.
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
This approach achieves a multi-colored finish without the need for protective topcoats, ensuring durability and meeting automotive specifications by controlling the depth and pattern of laser ablation to create intricate designs and gradients.
Implementation Method 1
depositing a first decorative metal layer on the plurality of sub-layers; depositing a second decorative metal layer on the first decorative metal layer
Implementation Method 2
selectively removing portions of the outermost layer using laser ablation to expose underlying layers
Data Source
AI summary
A decorative component includes a plurality of metal finish layers deposited over a substrate and a plurality of sub-layers. The outermost metal finish layer is selectively deposited or removed to define one or more recesses to create different appearances of the component. The outer metal layer may undergo laser ablation to remove at least a portion of the outer layer while still exposing the outer layer in the area of removed material. The recess may extend fully through the outer layer to expose the underlying metal finish layer, and/or the recess may have a sloped bottom surface to define a gradient appearance. The outer layer may be applied over a mask that is applied to the underlying layer, such that the outer layer is selectively applied. The outer layer may be removed to expose the underlying finish layer without exposing a nickel sublayer and without requiring a top coat.