Composite Silver-Plated Product with Oxidized Carbon Particles
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Solution Overview
Problem
Conventional composite plated products for sliding contact parts, such as switches and connectors, face issues with high friction coefficients, uneven appearance, and unstable contact resistance due to the use of silver-plating solutions containing cyanides and silver nitrate, which also lead to high production costs and insufficient wear resistance.
Innovation Solution
A method involving the use of a silver-plating solution with sulfonic acid and oxidation-treated carbon particles for electroplating, which improves the dispersibility and retention of carbon particles in the silver layer, resulting in a composite plated product with a higher carbon content and improved wear resistance without the need for cyanide or silver nitrate-based solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional silver-plating solutions containing cyanides and silver nitrate are used, then the electroplating process can proceed, but the resulting composite plated products have high friction coefficients, uneven appearance, and unstable contact resistance
Solution Approach 1:
The patent changes the chemical composition parameters of the plating solution by replacing cyanide-based and silver nitrate-based solutions with a sulfonic acid-based solution containing specific additives (brightener, leveler, wetting agent). This parameter change resolves the contradiction by achieving stable contact resistance and low friction coefficient simultaneously through optimized solution chemistry.
Solution Approach 2:
The patent uses composite carbon particles consisting of soft carbon (for low friction) and hard carbon (for wear resistance) dispersed in the plating solution. This composite material approach allows the plated surface to simultaneously achieve low friction coefficient and stable contact resistance, resolving the technical contradiction.
2Reliability
If conventional methods are used to form composite plating films, then silver plating can be achieved, but the carbon particle content and surface area coverage are insufficient for long-life contact applications
Solution Approach 1:
The patent performs preliminary treatment of carbon particles by surface oxidation before adding them to the plating solution. This preliminary action enhances the dispersibility and adhesion of carbon particles, allowing higher carbon content to be incorporated into the plating film while maintaining uniform distribution, thus improving wear resistance.
Solution Approach 2:
The patent uses sulfonic acid as an intermediary substance that facilitates the incorporation and retention of carbon particles in the silver matrix during electroplating. The sulfonic acid acts as a mediator between the carbon particles and the metal deposition process, enabling higher carbon content retention in the final plating film.
3Ease of manufacture
If cyanide-containing plating solutions are used, then electroplating can proceed, but high production costs and environmental treatment requirements arise
Solution Approach 1:
The patent extracts and removes the harmful cyanide component from the plating solution system, replacing it with a sulfonic acid-based solution. This extraction eliminates the need for expensive cyanide effluent treatment while maintaining effective electroplating functionality, thus reducing production costs and environmental impact.
Solution Approach 2:
The patent replaces expensive and environmentally problematic cyanide-based solutions with cheaper, environmentally friendly sulfonic acid-based solutions. Although the new solution requires careful formulation with multiple additives, the overall cost is reduced by eliminating cyanide handling, storage, and treatment infrastructure.
4Manufacturing precision
If silver nitrate-based plating solutions are used, then electroplating can proceed, but dendritic silver deposition occurs resulting in uneven appearance and unstable contact resistance
Solution Approach 1:
The patent introduces sulfonic acid as an intermediary that mediates the silver ion reduction process, preventing direct dendritic deposition. The sulfonic acid complexes with silver ions in a controlled manner, enabling uniform nucleation and growth of silver crystals, thus achieving smooth and uniform plating surfaces.
Solution Approach 2:
The patent changes the electrochemical parameters of the plating solution by using sulfonic acid instead of silver nitrate, which fundamentally alters the deposition mechanism. This parameter change eliminates dendritic growth by providing a more controlled ion release and reduction process, resulting in uniform surface morphology.
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 produces a composite plated product with a low contact resistance, good wear resistance, and a uniform appearance, effectively addressing the limitations of existing technologies by enhancing the carbon content and reducing production costs.
Implementation Method 1
treating carbon particles by an oxidation treatment
Implementation Method 2
forming a coating film of a composite material, which contains the carbon particles in a silver layer, on the base material by electroplating the base material
Data Source
AI summary
There are provided a composite plated product, which has little uneven appearance, a low contact resistance and good wear resistance, and a method for producing the same without the need of any silver-plating solutions containing cyanides and any silver-plating solutions containing silver nitrate as a silver salt. After carbon particles are caused to be suspended in water, an oxidizing agent is added thereto for carrying out a wet oxidation treatment of the carbon particles, and a silver-plating solution, which contains at least one sulfonic acid and the carbon particles treated by the wet oxidation treatment, is used for electroplating a base material to form a coating film of a composite material, which contains the carbon particles in a silver layer, on the base material to produce a composite plated product.