Nickel-Plating Stack With Variable Phosphorus Without Oxide Films
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Solution Overview
Problem
Conventional methods face difficulties in easily changing the phosphorus concentration among multiple nickel layers in a nickel-plating stack, leading to the formation of oxide films between layers.
Innovation Solution
A method involving a nickel plating solution with phosphorus and a sulfur additive, combined with a convection and shaking mechanism, allows for the formation of nickel layers with varying phosphorus concentrations without changing the solution's state, ensuring direct contact between layers and preventing oxide film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the plating-target member is removed from the nickel plating solution to form multiple nickel layers with different phosphorus concentrations, then the phosphorus concentration can be changed among layers, but oxide films are formed between the nickel layers
Solution Approach 1:
A sulfur-containing compound is introduced as an intermediary substance in the nickel plating solution to suppress oxide film formation. The sulfur-containing compound acts as a mediator between the nickel plating solution and the nickel layer, preventing oxidation at the interface while allowing phosphorus concentration to be varied among multiple nickel layers.
2Adaptability or versatility
If multiple nickel plating solutions with different phosphorus concentrations are used, then different phosphorus concentrations can be achieved, but the process complexity and time increase
Solution Approach 1:
The phosphorus concentration in nickel layers is controlled by changing parameters of a single nickel plating solution (temperature, pH, plating time) rather than using multiple different solutions. This allows varied phosphorus concentrations among multiple nickel layers while simplifying solution management and reducing process complexity.
3Productivity
If the plating-target member is repeatedly immersed in nickel plating solution to form multiple layers, then mass productivity is maintained, but oxide films form between layers
Solution Approach 1:
The sulfur-containing compound serves as a protective intermediary that remains in the nickel plating solution during repeated immersion cycles. It continuously suppresses oxide film formation between nickel layers even when the plating-target member is repeatedly immersed and removed, thereby maintaining mass productivity without the harmful oxide film formation.
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
This approach enables the formation of nickel-plating stacks with improved wear resistance, corrosion resistance, and solder wettability, while maintaining high mass productivity and avoiding oxide films between layers.
Implementation Method 1
The convection mechanism causes convection of the nickel plating solution
Implementation Method 2
The shaking mechanism shakes the plating-target member
Implementation Method 3
forming a nickel-plating stack on the plating-target member using the nickel plating solution. The nickel-plating stack includes nickel layers having different phosphorus concentrations
Data Source
AI summary
A method of manufacturing a nickel-plating stack includes: preparing a nickel plating solution including phosphorus and a sulfur additive, and a plating-target member; and forming a nickel-plating stack on the plating-target member using the nickel plating solution. The nickel-plating stack includes nickel layers having different phosphorus concentrations.