Electroplated Copper Alloy Layers for Corrosion Resistance
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Solution Overview
Problem
The fashion and jewelry industries face challenges in achieving non-allergenic, economically viable, and environmentally friendly electroplated products with high corrosion and abrasion resistance, as existing solutions often rely on nickel or palladium intermediate layers that are costly or pose health risks.
Innovation Solution
An electroplated product with multiple copper alloy layers, specifically a first copper alloy with lower copper concentration and a second with higher copper concentration, acts as a copper sink to prevent migration, eliminating the need for nickel or palladium, and featuring a precious metal finishing layer for improved durability and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nickel or palladium intermediate layers are used to prevent copper migration and provide corrosion resistance, then corrosion resistance is improved, but production cost increases and allergenic risks arise
Solution Approach 1:
The patent divides the intermediate layer into two distinct copper alloy layers with different compositions: a first copper alloy layer (lower copper concentration, higher tin and zinc) adjacent to the base material, and a second copper alloy layer (higher copper concentration, lower tin and zinc) adjacent to the precious metal finishing layer. This segmentation allows each layer to perform specialized functions - the first layer acts as a copper sink to prevent copper migration, while the second layer provides corrosion resistance and brightness, thereby eliminating the need for expensive nickel or palladium intermediate layers.
2Ease of manufacture
If white bronze (copper, tin, zinc alloy) is used as an alternative to nickel, then nickel-free production is achieved, but corrosion resistance requirements are not met
Solution Approach 1:
The patent creates a composite structure using two different copper alloy layers with distinct compositions. The first copper alloy layer contains lower copper concentration (e.g., 60-80 wt% Cu) and higher tin and zinc content, while the second copper alloy layer contains higher copper concentration (e.g., 80-95 wt% Cu) and lower tin and zinc content. This composite arrangement combines the copper-sink capability of the tin-rich first layer with the corrosion resistance and brightness of the copper-rich second layer, achieving both nickel-free production and superior corrosion resistance.
3Illumination intensity
If tin content is increased to more than 50 wt.-% to improve brightness, then brightness level increases, but resistance to acidity and oxidants decreases leading to poor corrosion resistance
Solution Approach 1:
The patent applies local quality by creating spatial variation in alloy composition across the intermediate layers. The first copper alloy layer has lower copper concentration and higher tin content optimized for copper migration prevention, while the second copper alloy layer has higher copper concentration and lower tin content optimized for corrosion resistance and brightness. This local differentiation allows each region to possess the specific properties needed for its function, avoiding the need for uniformly high tin content that would compromise corrosion resistance.
4Reliability
If chromium intermediate layers are used, then adhesion and corrosion resistance are improved, but toxic chromium VI is used and adhesion problems occur
Solution Approach 1:
The patent replaces expensive and toxic chromium intermediate layers with environmentally friendly copper alloy layers that are both effective and economical. The two-layer copper alloy structure provides the necessary adhesion and corrosion resistance without relying on toxic chromium VI, thereby eliminating harmful factors while maintaining protective functionality.
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 solution provides enhanced corrosion and abrasion resistance, increased shelf life, and reduced production costs, while ensuring the product is non-allergenic and meets the brightness requirements of the fashion industry.
Implementation Method 1
The electroplated product comprises a base material, a first electroplated copper alloy layer, a second electroplated copper alloy layer, and a precious metal finishing layer
Implementation Method 2
the second copper alloy layer acts as a copper sink and prevents migration of copper into the precious metal finishing layer
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
This invention provides an electroplated product with a precious metal finishing layer that has an improved corrosion and abrasion resistance. The electroplated product comprises two electroplated copper alloy layers having a different copper concentration (e.g. white bronze and yellow bronze). The electroplated product is especially suitable for use in jewelry, fashion, leather, watch, eyewear, trinkets and/or lock industry. Another advantage of the electroplated product is that the use of allergenic nickel or expensive palladium intermediate layers against copper migration can be dispensed with. This means that the electroplated product can be non-allergenic (nickel-free) and be provided in a more economical and environment-friendly manner. A method for the production of the inventive electroplated product is presented. Furthermore, the use of the inventive electroplated product in the jewelry, fashion, leather, watch, eyewear, trinkets and/or lock industry is suggested.