How To Clean Flux Residue After Silver Soldering

When I use flux such as for silver soldering brass or steel to copper I clean the completed joint with a long strip of rag which has been wet with hot water.

How to clean flux residue after silver soldering. The best way of removing this is to immediately plunge the item into boiling water while it is still hot from soldering. Check with the manufacturer for recommended solvents. This depends greatly on what kind of solder and flux you used.

Using any water based cleaner such as Detergent 8 Low-Foaming Ion-Free Detergent will result in the formation of a white insoluble residue in the presence of heavy metals such as lead or even tin along with burned acids from rosin or other acid activated solder fluxes. To remove the white residue a post soldering cleaning step is required. After soldering they prevent unconsumed activators from dissolving in water.

There are also several brands of chemical cleaners specifically designed to clean flux goop. Take a clean brush. Brushing or swabbing the brazed area in conjunction with the water quench may help remove stubborn residue.

You can submerge the assembled board in a container that is filled with this and agitate it for some 30 sec. To maintain the appearance of resin-free clean assemblies many engineers choose a flux formulation with low concentrations of binders potentially increasing the risk of. I usually wipe joints with a water saturated rag after soldering.

Rosin mildly activated works best for the filthy surfaces and. Care should be taken in. To confirm root cause you can send a sample board to Kyzens Application Lab for analysis.

For Soldering on our production lines we using Kester Solder SN 63 Pb 37 with Flux 245 No clean in addition we using Kester Flux 959 977 2331-ZX. Trying to remove water. The binders form the bulk of the visible residue.