Dispersion Electrolyte for Particle-Containing Tin Alloy Layers
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Solution Overview
Problem
Existing coatings with tin or tin alloys for electronic components offer good corrosion resistance but disadvantageous electrical properties, leading to increased contact resistance and higher overvoltages in electrochemical reactions, necessitating a solution that improves both corrosion protection and electrical conductivity while being cost-effective.
Innovation Solution
A dispersion electrolyte for electrodeposition of particle-containing tin alloy layers, incorporating tin ions, alloying elements like copper or nickel, and inorganic piezoelectric or conductive ceramic particles, which reduces overvoltage and enhances corrosion resistance by forming a particle-containing tin alloy layer with improved electrical and corrosion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tin or tin alloy coatings are used for corrosion protection, then corrosion resistance is improved, but electrical properties deteriorate (increased contact resistance and higher overpotentials)
Solution Approach 1:
The patent applies composite materials by combining tin alloy with inorganic particles (such as metal oxides, ceramics, or piezoelectric materials) to create a particle-containing coating layer. This composite structure allows the coating to simultaneously exhibit corrosion resistance from the tin alloy matrix and improved electrical properties from the conductive or piezoelectric particles, thereby resolving the contradiction between corrosion protection and electrical performance.
Solution Approach 2:
The patent implements local quality by creating a heterogeneous coating where different regions have different properties. The tin alloy provides corrosion resistance throughout the coating, while localized inorganic particles (particularly conductive or piezoelectric ones) are distributed to specifically address electrical property deficiencies at critical locations, allowing simultaneous optimization of both corrosion resistance and electrical characteristics.
2Quantity of substance
If tin alloy coatings are used instead of precious metals, then cost is reduced, but electrical properties deteriorate (increased contact resistance)
Solution Approach 1:
The patent uses composite materials by incorporating conductive inorganic particles (such as metal oxides or ceramics) into the tin alloy matrix. This composite structure maintains the cost advantage of using tin instead of precious metals while the conductive particles locally enhance electrical conductivity, reducing contact resistance and resolving the contradiction between cost reduction and electrical performance.
3Reliability
If conventional tin alloy electrolytes are used, then good corrosion resistance is achieved, but overpotential for electrochemical reactions increases
Solution Approach 1:
The patent applies parameter changes by modifying the physical and chemical composition of the coating through the addition of inorganic particles with specific properties (conductivity, piezoelectricity, surface area). These compositional parameter changes enable the coating to reduce overpotential while maintaining corrosion resistance, thereby improving electrochemical reaction efficiency without sacrificing protective properties.
Solution Approach 2:
The patent employs composite materials by creating a tin alloy coating reinforced with inorganic particles that have catalytic or conductive properties. This composite structure simultaneously provides corrosion resistance from the tin alloy and reduced overpotential from the functional particles, resolving the contradiction between corrosion protection and electrochemical reaction efficiency.
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 particle-containing tin alloy layer exhibits reduced overvoltage for electrochemical reactions, improved corrosion resistance in acidic and alkaline media, and enhanced electrical conductivity, making it suitable for use as a protective layer in electronic components.
Implementation Method 1
dispersion electrolyte for the galvanic deposition of particle-containing tin alloy layers
Implementation Method 2
at least one type of particle selected from inorganic piezoelectric particles... the overpotential for electrochemical reactions in aqueous media can be reduced using particles made of an inorganic piezoelectric or electrically conductive ceramic material
Data Source
Figure 1~2
AI summary
The invention relates, inter alia, to a dispersion electrolyte for the electroplating of particle-containing tin alloy layers. The dispersion electrolyte comprises 2 to 100 g/L tin ions; 1 to 100 g/L ions of a second alloying element selected from copper, silver, bismuth, nickel, cobalt, cadmium, zinc, manganese, and combinations thereof; 1 to 200 g/L at least one type of particle selected from inorganic piezoelectric particles, electrically conductive ceramic particles, and combinations thereof; at least one dispersant selected from anionic dispersants, nonionic dispersants, and combinations thereof; and water. The pH value is 7 or lower. The dispersion electrolyte can be used to electroplaten a particle-containing tin alloy layer onto a metallic or metallized substrate.