Merapto-Triazole Additive for Gold Electrodeposition
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Solution Overview
Problem
The existing electroplating processes for gold and gold alloys face issues with gold displacement reactions, leading to unwanted gold deposition on non-intended areas, increased material costs, and defects in electronic components due to immersion reactions, which are not adequately addressed by current solutions like mercapto-tetrazole compounds.
Innovation Solution
An electroplating composition containing a mercapto-triazole compound is used, which significantly decreases or inhibits gold immersion reactions by forming a stable and uniform gold deposition layer, even in aged baths, thereby reducing gold consumption and extending the life of the plating solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional electroplating processes are used without anti-immersion additives, then gold can be deposited on substrates, but gold displacement reactions occur causing unwanted gold deposition on non-intended areas and increased material consumption
Solution Approach 1:
A mercapto-triazole compound is introduced as an intermediary substance in the electroplating bath. This compound selectively adsorbs onto the substrate surface and forms a protective layer that prevents spontaneous gold displacement reactions while allowing controlled electrochemical deposition. The mercapto-triazole acts as a mediator between the gold ions and the substrate, enabling precise deposition only where electrical current is applied.
2Duration of action of moving object
If electroplating is stopped during idle times with connectors remaining in the gold deposition bath, then the process can be paused, but immersion reactions continue causing unwanted gold layer formation
Solution Approach 1:
The mercapto-triazole compound is added to the electroplating bath before the plating process begins and remains present throughout idle times. This preliminary anti-action continuously suppresses immersion reactions even when the plating process is paused, preventing unwanted gold deposition during non-operational periods without requiring removal or replacement of the electrolyte.
3Duration of action of stationary object
If the age of the gold electrolyte increases, then the plating process can continue longer, but gold immersion reactions increase leading to higher gold consumption and defective products
Solution Approach 1:
The mercapto-triazole compound maintains continuous protective action throughout the entire electrolyte lifetime, from initial use through extended operational periods. This ensures that immersion reactions are consistently suppressed regardless of electrolyte age, allowing the plating process to continue indefinitely without the increasing gold consumption that typically occurs with electrolyte aging.
4Loss of substance
If plating equipment design is improved to reduce gold immersion, then gold consumption decreases, but costly expenditures are required to redesign and manufacture new equipment parts
Solution Approach 1:
Instead of modifying equipment design parameters, the solution changes the chemical parameters of the electroplating bath by adding mercapto-triazole compounds. This chemical parameter change achieves the same effect of reducing gold immersion and consumption without requiring any physical modifications or redesign of the plating equipment, thus avoiding substantial manufacturing costs.
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 use of mercapto-triazole in the electroplating composition effectively minimizes gold deposition on non-intended areas, reduces material costs, and enhances the adhesion and durability of gold layers, maintaining the mechanical stability and electrical properties required for high-reliability applications.
Implementation Method 1
An electroplating composition comprising (i) at least one source of gold ions, and (ii) at least one mercapto-triazole or a salt thereof... applying an electrical current between the substrate and at least one anode and thereby depositing a gold or gold alloy onto the substrate
Implementation Method 2
The mercapto-triazole compound which acts as an anti-immersion additive... significantly decreases or nearly inhibit the gold immersion reaction
Data Source
Figure 1~2
AI summary
The present invention relates to a composition and method for electrodepositing gold containing layers using the composition and the use of mercapto-triazole compounds as anti-immersion additives. The composition contains a mercapto-triazole compound which acts as an anti-immersion additive. The composition and method are suited for depositing functional or hard gold or gold alloys that can be applied in the industry as contact material of electrical connectors for high reliability applications.