Q. I am seeing a white powder around solder joints on PCBs. Is this solder flux? We use Detergent 8 for cleaning. Do you know why this is happening and how to stop or remove it?
A. There are several ways of approaching this common issue of solder flux and its removal. For example, One way to fix this problem is to lower the temperature when soldering. In another scenario, a leading aerospace manufacturer studied putting potassium silicate (10 mL in 10 L) into the Detergent 8 bath to act as an inhibitor to stop the formation of these white salts.
Q. We need to remove RMA solder flux on indium/lead soldered subassemblies. Most aqueous cleaners attack this solder. A. According to the Materials H
Q: What types of Alconox, Inc. detergent would I use to clean a mold release agent? As an aside, is there any chance I could use the same detergent to also clean copper traces off a printed circuit board?
A: Yes! You may indeed be able to use one detergent in both these cleaning applications. But it will only work if the copper is not in the form of an oxide. Here’s why.
A non-free rinsing cleaner might contain fragrances that were designed to deposit and leave a fresh scent, or it might contain corrosion inhibitors that are designed to deposit and leave behind an anti-corrosion film.
Alconox, Inc, cleaners are free rinsing detergents and do not leave deposits on substrates after rinsing.
Q: We are having trouble removing polyurethane glue from stainless steel bolts.
A: Adherent residues can be tough. And clearly glue is adherent, per design.
For this application we want to increase temperature to expedite the cleaning effort as much as possible, and soften the glue. We also want to up the concentration to ensure having sufficient detergent capacity.