How To Clean Flux Residue After Silver Soldering

Removal is generally accomplished by thorough washing in warm detergent water or in hot water containing dilute hydrochloric acid followed by hot water rinse.

How to clean flux residue after silver soldering. Flux residues are chemically corrosive and if not removed could weaken certain joints. Then take a wire brush to clear off the residues and smut. 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.

After soldering we using Vapor Degreaser process with RHO-TRON 225 AES-L to clean up the flux. With light heat and vacuum there will be no water residue and the part can then be cleaned with an alcohol based cleaner in the ultrasonic cleaner which flashes off just as well. Never allow solvents or water to drain into connector body.

Low-Temperature Brazing Fluxes These residues may be removed with hot water. Give it a few minutes for the salt to re-hydrate and loosen up. After soldering it is VERY important to neutralize and remove all flux residue from your solderingCJs Flux Removeris designed specifically to do this.

Check with the manufacturer for recommended solvents. If I leave it for a week after soldering so the flux thickens then I just have to leave it submerged for longer and maybe lightly brush it. The binders form the bulk of the visible residue.

Cleaning the flux residue. To remove the white residue a post soldering cleaning step is required. Click to expand.

Most Solders use a Rosin type flux. No need to add acid or other ingredients. Apply some CJs and using a soft to medium bristle brush or a clean soft rag scrub the project thoroughly.