Soldering Flux

Category: science

A chemical cleaning agent used before and during soldering to eliminate surface oxidation and improve liquid metal flow.

Flux is mandatory for micro-soldering. When heated, it removes microscopic oxide layers from copper pads and prevents new oxidation from forming during the repair. This lowers the surface tension of the molten solder, forcing it to snap neatly onto the metal pads instead of bridging pins.

Common Examples

• The technician applied a premium no-clean tack flux to ensure the tiny surface-mount resistor bonded smoothly to the pad.
• Failing to use adequate flux results in cold solder joints, characterized by a dull, brittle appearance and poor connection reliability.