Electroless Platinum Plating Bath Using Formic Acid
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Solution Overview
Problem
The electroless platinum plating solution using hydrazine as a reducing agent is not sufficiently stable and requires a high pH, making it difficult to apply to electric components due to potential dissolution of dry-film resist.
Innovation Solution
An electroless platinum plating solution comprising a soluble platinum compound, a complexing agent, a reducing agent (formic acid), and a halide ion supplying agent, with a molar ratio of halide ions to platinum of 10 or more, which stabilizes the solution and allows for deposition at a pH of 9 or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrazine is used as a reducing agent in electroless platinum plating solution, then the deposition rate is improved, but the solution stability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by replacing hydrazine with formic acid as the reducing agent and adding specific complexing agents (EDTA, citric acid) and halide ions. This parameter change resolves the contradiction by achieving both adequate deposition rate and improved solution stability through the milder reducing action of formic acid combined with complexation chemistry.
2Productivity
If high pH is used to obtain practical deposition rate, then the deposition rate is improved, but the harmful effects increase due to dissolution of dry-film resist
Solution Approach 1:
The patent changes the pH parameter from high (conventional) to low (pH 9 or less), which resolves the contradiction by enabling practical deposition rates under mild acidic or neutral conditions. The use of formic acid as reducing agent and appropriate complexing agents allows the plating reaction to proceed effectively at lower pH, preventing damage to dry-film resist while maintaining productivity.
3Stability of the object's composition
If formic acid is used as reducing agent with low pH, then the solution stability is improved, but the deposition rate may decrease
Solution Approach 1:
The patent creates a composite chemical system combining formic acid (reducing agent), complexing agents (EDTA, citric acid), and halide ions. This composite approach resolves the contradiction by synergistically combining multiple components where the complexing agents enhance platinum complex stability and the halide ions promote reduction kinetics, achieving both solution stability and adequate deposition rate at low pH.
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 a stable electroless platinum plating process that effectively deposits platinum on components without dissolving dry-film resist, maintaining stability and deposition rate, even under neutral conditions.
Implementation Method 1
a reducing agent, and a halide ion supplying agent, the reducing agent being formic acid
Implementation Method 2
a complexing agent, and a halide ion supplying agent, the halide ion supplying agent being included at a molar ratio of 10 or more with respect to platinum
Data Source
AI summary
An electroless platinum plating solution includes a soluble platinum compound, a complexing agent, a reducing agent, and a halide ion supplying agent, the reducing agent being formic acid.