USB Type-C Connector Plating Layout for Corrosion-Cost Balance
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Solution Overview
Problem
USB Type-C connectors face issues with corrosion due to harsh use environments, leading to failures like slow charging and OTG recognition problems, despite using precious metals for electroplating, which increases costs due to high consumption of costly materials.
Innovation Solution
The use of a split-type carrier design for selective electroplating of conductive terminals with different materials for the first and second electroplated layers, where the first layer, made of platinum group metals like rhodium and ruthenium, provides high corrosion resistance on high-potential pins, and the second layer, made of materials like nickel and gold, provides lower corrosion resistance on low-potential pins, optimizing material usage and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precious metals are used for electroplating all conductive terminals, then corrosion resistance is improved, but electroplating costs increase sharply due to high consumption of costly materials
Solution Approach 1:
The patent applies different electroplating materials to different conductive terminals based on their specific corrosion risks. High-potential pins that are more prone to corrosion receive platinum group metal plating, while low-potential pins receive nickel or gold plating. This localized differentiation optimizes corrosion resistance where needed while reducing overall material consumption and cost.
Solution Approach 2:
The patent segments the electroplating process into separate stages for different conductive terminals. By dividing the terminals into high-potential and low-potential groups and applying different plating materials to each group, the patent achieves selective corrosion protection without uniformly plating all terminals with expensive precious metals, thereby reducing total material consumption.
2Ease of manufacture
If immersion plating is used for electroplating, then the plating process is simplified, but consumption of precious metal increases due to the inherent feature of the electroplating solution
Solution Approach 1:
The patent applies immersion plating selectively only to high-potential pins that require platinum group metal plating, rather than immersing all conductive terminals in the precious metal solution. This localized immersion approach maintains process simplicity for the critical components while dramatically reducing overall precious metal consumption.
Solution Approach 2:
The patent segments the electroplating operations into separate immersion plating for high-potential pins and different plating methods for low-potential pins. This segmentation allows immersion plating to be used where most beneficial while avoiding unnecessary precious metal consumption on terminals that don't require such protection.
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 balances corrosion resistance and cost by selectively applying precious metals, extending the life span of USB Type-C connectors while minimizing the consumption of costly electroplating materials, thus reducing overall electroplating costs and ensuring effective corrosion protection.
Implementation Method 1
a first electroplated layer is disposed on an outer surface of the first conductive terminal... A second electroplated layer is disposed on an outer surface of the second conductive terminal...
Data Source
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AI summary
Embodiments of this application disclose an electrical connector, including at least one first conductive terminal and at least one second conductive terminal, where a first electroplated layer is disposed on an outer surface of the first conductive terminal, a second electroplated layer is disposed on an outer surface of the second conductive terminal, and a material of the second electroplated layer is different from a material of the first electroplated layer. Electroplating costs of the electrical connector are reduced while corrosion resistance of the electrical connector is ensured. The embodiments of this application further disclose a mobile terminal and an electrical connector manufacturing method.