In electronic manufacturing, the quality of PCBA (Printed Circuit Board Assembly) soldering is crucial for the reliability and performance of the product. Surface tension and viscosity are key factors affecting the soldering effectiveness. If not handled properly, it can easily lead to soldering issues. So, how can we reduce the surface tension and viscosity in PCBA soldering?
1. What Are Surface Tension and Viscosity?
① Surface Tension
Refers to the attractive force between molecules at the surface of a liquid, causing the liquid surface to minimize in area. In PCBA soldering, surface tension affects the wetting and spreading of solder;
② Viscosity
Is the resistance of a liquid to flow. In PCBA soldering, viscosity determines the flowability of solder, affecting its filling capability and uniform coverage.
2. How to Reduce Surface Tension?
① Control Temperature
During the soldering process, appropriately increasing the solder temperature helps to reduce surface tension and promotes solder wetting;
② Use Surfactants
Adding an appropriate amount of surfactants to the solder can effectively reduce surface tension and improve wetting performance.
3. How to Reduce Viscosity?
① Control Temperature
Similar to reducing surface tension, appropriately increasing the temperature can lower the viscosity of solder, increasing its flowability;
② Change Solder Composition
Adjusting the alloy composition in the solder can change its viscosity. For example, increasing the tin content in solder can lower viscosity;
③ Use Flow Control Agents
Adding an appropriate amount of flow control agents to the solder can lower viscosity and improve filling and flow performance.
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