What is Corrosive Flux

By Bester PCBA

Last Updated: 2023-11-20

Table of Contents

What is Corrosive Flux

Corrosive flux is a type of flux used during the soldering process. Flux is a material applied to the surface of a circuit board before soldering to facilitate the soldering process by removing oxides and promoting the wetting of the solder. Unlike other types of flux, corrosive flux contains chemicals and additives that not only aid in the soldering process but also have the ability to corrode or etch the metal surfaces it comes into contact with.

Using corrosive flux ensures strong and reliable solder joints. It is designed to be more aggressive in its oxide removal capabilities, allowing it to thoroughly remove oxides from the metal surfaces. This aggressive action helps to achieve clean and reliable solder joints. However, caution must be exercised when using corrosive flux, as its aggressive nature can potentially damage or weaken the metal surfaces if not used properly.

Thorough cleaning is necessary after soldering to remove any corrosive flux residues. If left on the circuit board, these residues can lead to corrosion over time, compromising the long-term reliability of the PCB. Therefore, proper cleaning procedures should be followed to ensure the removal of all corrosive flux residues.

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