PCBfactorychina asked：What is a No-Clean Flux?

Soldering in aPCB(PrintedCircuitBoard) refers to the process of joining electronic components to the board using solder, which is a metal alloy that melts at a low temperature and solidifies as it cools down.Soldering is a crucial step inPCBassembly, as it forms a reliable electrical and mechanical connection between the component and the board.However,PCBsurfaces may have impurities on them (corrosion, oxidation, etc.) which prevents the solder from creating a bond with the metal surface of the PCB.This results in solder deformities.To solve the problem of improper soldering, a Flux is used.

A no-clean flux is a type of flux used in soldering that is formulated to leave minimal to no residue after the soldering process is complete.This type of flux is designed to eliminate the need for post-solder cleaning, which can save time and reduce the risk of damaging sensitive electronic components.

PCB manufacturer learned that，No-clean fluxes are formulated with highly activated synthetic resins, organic acids, and other additives that are engineered to break down oxides and other surface contaminants on the metal surfaces being soldered.These fluxes are typically water-soluble and are designed to evaporate quickly, leaving behind little or no residue.

Types: No-clean fluxes are available in different forms, including liquid, paste, or solid, and can be either water-soluble or non-water-soluble.Some no-clean fluxes are formulated for specific applications, such as high-temperature or lead-free soldering.

Advantage: One advantage of using a no-clean flux is that it eliminates the need for additional cleaning steps after the soldering process, which can save time and reduce the risk of damage to sensitive electronic components.Additionally, no-clean fluxes can reduce the environmental impact of soldering by reducing the use of cleaning chemicals and other consumables.

Application: No-clean fluxes are typically applied to the metal surfaces before soldering, using a brush, syringe, or automated dispenser.The flux is then activated by the heat of the soldering process and helps to ensure a strong and reliable bond between the solder and the metal.

However,FPC manufacturer learned that， it is important to note that not all no-clean fluxes are created equal, and some may leave behind residues that can affect the performance or reliability of the solder joint.It is crucial to select the appropriate type of no-clean flux for the specific application and to follow the manufacturer's instructions carefully to ensure a strong and reliable solder joint.