but it can be cleaned usually with isopropyl alcohol or acetone or flux removers if you don't want reside on the circuit board. Rosin flux is relatively mild and active only when it's heated up, and helps make better solder joints and in general it's not needed to removed from the circuit board as it's not conductive. The flux inside the solder is supposed to become liquid as it heats up from the solder iron tip, drop on the leads or pads your want to solder and attack the surfaces and corrode the oxides and shit so that when you bring the actual solder, the solder metal has a chance to chemically combine with the metals on the pads or leads and make a strong connection. and it's possible to have the solder iron tip too hot and actually burn the flux before it gets a chance to activate and do its job. It's not always enough, it depends on the parts you want to solder, how old and oxidized they are. typically 1 to 3% flux depending on diameter of wire and other factors. Modern solder wires have some amount of flux in them. NOW - a big question: What's wrong with the Rosin? If I go my old way and solder with the rosin solution in spirit - is there anything wrong with that? Last question: To make a paste like flux is it possible to mix the ethanol alcohol, rosin and Vaseline (petroleum jelly)? Will it work as a paste flux? Remember, those warnings are copied over to the Chinese made fake stuff but since it exists on the original ones as well it must be twice as bad! Nevertheless people quote those warnings and continue to use it. However, there is a warning on those plastic jars: Don't use at home, it's toxic, harmful, so on. Amtech, Kingbo, you name it, are being the most popular ones but despite the fact they are fake people buy them in tonnes and enjoy soldering with them. Now, when I'm returning to the hobby I find the majority use some sort of paste flux that comes from China in syringes or plastic jars. I fact I tried to solder with the rosin core solder only and it didn't work just as good as it worked with the rosin solution added. To make it short: I used rosin core solder then BUT! - I was taught at that time (remember, it was over 30 years ago) not to rely solely on the rosin core solder but use spirit (alcohol) soluble rosin at every solder point in addition to the rosin activated flux and I did exactly that. Last time I seriously touched my iron, it was 32 years ago when I soldered-assembled and setup a clone of the ZX Spectrum Z80 MPU based computer. The main advantage of using a no-clean flux is that you won’t need to clean the surface after soldering, because they do not affect electrical conductivity.Hello, getting back into the hobby. You can, however, find no-clean fluxes that won’t leave residue behind. The behaviors and properties of no-clean fluxes can vary significantly depending on their respective chemical composition for example, some no-clean fluxes leave a tremendous amount of residue, which is unattractive, though it is no threat to the surface. No-clean flux is a mixture of organic resins - aside from rosin - mixed with certain inorganic agents. (Note: You can also find inorganic water soluble flux, which is even more powerful than water soluble flux.) No-Clean Flux Organic flux is more reactive than rosin activated flux and is thus a stronger cleaner. In addition, water soluble flux tends to be a more aggressive oxidizer than is usually required. The downside to using water soluble flux is it often bonds with the circuit board itself or other metal surfaces, and as a result will require thorough cleaning. Water soluble flux, also called organic acid flux, is typically made from glycol bases. ![]() Rosin activated flux cleans best, but will leave a significant amount of residue behind - because of this, rosin activated flux is rarely used. Rosin mildly activated flux is used on dirtier surfaces and will leave more residue than ordinary rosin flux after using rosin mildly activated flux, you use a flux cleaner to cleanse the surface. ![]() ![]() Rosin flux is used for cleaning already clean surfaces, and has the advantage of leaving no residue behind. Each have a different level of activators or agents enabling the flux to deoxidize and clean. There are three types of rosin flux: rosin (R), rosin mildly activated (RMA), and rosin activated (RA). Rosin flux is, unsurprisingly, made up primarily of rosin, which is extracted from the sap of pine trees, and contains the active ingredient abietic acid (other acids may be present as well). ![]() Let’s take a look at the different types of flux. Solder flux is a vital part of electronic design and repair. Because any oxides that remain on a metal surface can result in poor solder connections, the chief function of flux is to deoxidize metal surfaces without decomposing. Flux is used for cleaning metal surfaces before soldering them together.
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