![]() ![]() The most important thing to remember is whatever flux you are going to use it is not going to cause any long term problems if you take care to remove any residue, we try even to remove no clean fluxes just to be on the safe side since it’s pretty easy to do with the correct flux removal cleaners. This will avoid any unnecessary acidic corrosion. When using solder with a flux core it is important to match the flux type with the pre tinned flux used on the two parts to be soldered. If the board comes out very clean and pretty, the paste used was most likely a variety that contains no clean flux, as opposted to rosin core flux. The amount of solder paste is carefully controlled and consistent from board to board. Additionally, the water soluble nature of the organic acid flux allows the PCB to be easily cleaned with regular water.Ĭleaning of organic flux is important which is why we use a No-Clean flux where the residue is non conductive and non corrosive. Mass produced boards typically use a reflow soldering process. These are stronger than rosin fluxes and clean the oxides off much quicker. The weak organic acids are combined with solvents like isopropyl alcohol and water. ![]() Common weak acids are used in organic acid flux, such as citric, lactic, and stearic acid among others. The fast drying aerosol is designed to remove harmful residues in tight. ![]() One of the more common fuxes used is water soluble organic acid (OA) flux. The Chemtronics ES135 is a clear liquid flux remover that comes in a 1 gal container. Rosin flux is the most aggressive flux and in today’s sensitive electronics it is most likely to harm over time if heated to its activity point, meaning it becomes acid and will start to corrode areas where residues have not been removed after use. Ideally flux will flow easily, especially when hot, removes oxides quickly, and helps to remove foreign particles from the surface of the metal being soldered. No-clean fluxes should be thrown into the garbage (or perhaps disposed of in an environmentally responsible manner). Rosin flux is still used today, but typically is a blend of fluxes to optimize the flux, its performance, and characteristics. RMA/RA fluxes are pretty benign, though some recommend cleaning. Some of the oldest types of flux used is based off pine sap (refined and purified) called rosin. Manual cleaning using isopropyl alcohol (IPA). In all cases, the best flux to use is the least acidic (least aggressive) flux that will work on the oxide on the components and result in a good solder bond. Automated stencil cleaning systems for both stencil and misprinted boards. However, there are several applications where additional flux is extremely beneficial, such as wire tinning surface mount soldering and de-soldering. For many applications, the flux included in the core of the solder wire is sufficient. ![]()
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