How to Remove Powdered Flux From Brass
Powdered flux consists of a blend of salts that chemically protect metals from oxidization. Oxidization occurs when heated metal is exposed to room temperature air. While brazing, the flux powder dissolves and absorbs any oxides created during the heating process. Each metal type uses a specific flux; this ensures the integrity of the metals while being heated. The excess flux needs to be removed following brazing because, over time, it can weaken metal with corrosion. Does this Spark an idea?
Things You'll Need
- Water
- Thermometer
- Glass or plastic container
- Wire brush
- Sulfuric acid or hydrochloric acid (optional)
- Protective safety gear (optional)
Please enter your 10 digit phone number only.
A link to this article has been sent to the phone number provided.
Instructions
-
-
1
Make sure the flux has hardened after brazing. The metal and flux will be pliable while they are cooling; use care when moving the jointed area.
-
2
Immerse the bonded area into a container of hot water as soon as it has hardened. The water temperature should be greater than 104 degrees Fahrenheit. Let it soak for twenty to thirty minutes.
-
-
3
Remove any loose flux residue using a wire brush. Brush the residual pieces away while holding the joint under room temperature running water.
-
4
Dip the metal into sulfuric acid or hydrochloric acid. This will help remove any remaining oxidization. The use of sulfuric or hydrochloride is optional as it is used to help remove left over oxidization; this is a cosmetic procedure.
-
1
Tips & Warnings
Avoid extreme temperature variations when cooling the flux and metal, the extremes can cause cracking.
The use of sulfuric or hydrochloric acid requires protective equipment including gloves, apron, safety glasses and a face shield.
