Selective Gold Plating via Heterocyclic Additive
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Solution Overview
Problem
Conventional gold plating solutions often deposit gold on undesired areas, leading to inefficiencies and increased costs due to the need for masking and subsequent removal of unwanted gold deposits, and they lack stability during storage.
Innovation Solution
A gold plating solution incorporating a reaction product of a nitrogen-containing heterocyclic compound and epihalohydrin, along with gold cyanide and cobalt compounds, which enhances selective deposition and stability, allowing for restricted gold deposition on desired areas while maintaining corrosion resistance, wear resistance, and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional gold plating solutions are used, then gold can be deposited on the substrate, but gold is also deposited on undesired areas leading to unnecessary metal consumption
Solution Approach 1:
The patent introduces a specific additive (hexamethylene tetramine in combination with other compounds) as an intermediary substance that mediates between the gold plating solution and the substrate. This additive acts as a selective agent that prevents gold deposition on undesired areas while allowing deposition on targeted areas, thereby reducing unnecessary gold consumption without compromising manufacturing precision
Solution Approach 2:
The patent modifies the chemical parameters of the plating solution by adding specific compounds (hexamethylene tetramine, fluorinated compounds, etc.) that change the deposition behavior of gold. These parameter changes enable selective deposition control, allowing gold to be deposited only on desired areas while preventing deposition on undesired areas, thus reducing material waste
2Loss of substance
If masking is used to restrict gold deposition to desired areas, then gold consumption is reduced, but the process complexity and time increase
Solution Approach 1:
The patent extracts the selective deposition function from the mechanical masking process and transfers it to the chemical composition of the plating solution itself. By incorporating selective additives directly into the solution, the need for complex masking operations is eliminated, while still achieving restricted gold deposition on desired areas only
Solution Approach 2:
The plating solution is designed to be self-regulating through the inclusion of selective additives that automatically prevent deposition on undesired areas. The solution itself provides the selectivity function without requiring external masking devices or complex process controls, thereby simplifying the overall manufacturing process
3Manufacturing precision
If hexamethylene tetramine is added to hard gold plating solution to suppress unnecessary precipitation, then selective deposition is improved, but the plating solution becomes unstable
Solution Approach 1:
The patent creates a composite plating solution system by combining hexamethylene tetramine with other stabilizing compounds (such as fluorinated compounds and other additives). This composite formulation maintains the selective deposition capability of hexamethylene tetramine while the additional compounds provide stability to the solution, preventing decomposition and maintaining consistent performance over time
Solution Approach 2:
The patent incorporates stabilizing additives in advance into the plating solution formulation to cushion against the instability caused by hexamethylene tetramine. These pre-added stabilizers prevent potential decomposition or unwanted reactions before they occur, ensuring the solution remains stable during storage and use while maintaining its selective deposition properties
4Loss of substance
If plating is conducted with masking to restrict gold usage, then gold consumption is reduced, but removal of gold from masked areas requires additional processing time
Solution Approach 1:
The selective additives in the plating solution act as intermediaries that prevent gold deposition on undesired areas during the plating process itself. This eliminates the need for subsequent removal operations, as no unwanted gold deposits are formed in the first place, thereby saving significant post-plating processing time while maintaining reduced gold consumption
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 enables efficient, selective gold deposition on desired areas, reducing unnecessary metal consumption and improving storage stability, resulting in faster plating speeds and improved work efficiency with broad current density applicability, suitable for industrial use.
Implementation Method 1
electrolytic gold plating solution
Implementation Method 2
gold deposition can be restricted to areas where gold is desired
Data Source
AI summary
A gold plating bath and a plating method is disclosed where gold cyanide or salts thereof provide the source of gold, a cobalt compound, and a reaction product of compound containing at least a nitrogen-containing heterocyclic compound and an epihalohydrin. The gold plating bath has high deposition selectivity.