7/30/2023 0 Comments Soldering flux alternative![]() The term used to describe flux acidity is “activity.” Most often, the acids are organic (meaning they contain carbon). (Jim) Smith, PhD ABD, President, Electronics Manufacturing Sciences, part of the flux that removes oxides, which the industry for reasons lost in antiquity insists on calling “activators,” is almost always acid, either directly or in a compound that releases acid when heated. Removal of oxides and prevention of reoxidation is the role of flux. With the exception of gold, all component surfaces are oxidized and that oxide must be completely removed and the deoxidize surface protected from reoxidizing before application of the solder. Oxidized metal lacks that energy, however, and does not allow wetting. Elemental metal is unstable and has energy to draw the solder (interatomic attraction). Solder flow is known as wetting and occurs only if the solder is applied to a pure elemental metal surface. If you haven’t read Part 1 of soldering flux, that really is the best place to start. ![]() If you read Part 1, you know the fundamentals of flux and are ready for the specifics of how to pick the flux that will make your soldering life very easy. This is the second of a three-part explanation of fluxes: what they do, how they do it and which one is best for various applications. However, fluxes are complex and making the right choice involves navigating a chemical minefield complicated by occasionally bizarre terminology and, too often, shady marketing practices by some well-known flux manufacturers. The right flux can save immense costs including but not limited to solder defects, cleaning and product failures. Liquid flux is just those same ingredients in a solvent.įlux selection may be the most important decision any electronics assembly business will ever make. RLC Resonant Frequency and Impedance Calculatorįlux consists of two basic ingredients: acids to remove oxides and a substance or substances (“solids”) to coat the surface and prevent oxygen from reaching the surface after oxides are removed.Bandwidth Rise Time and Critical Length Calculator.Transmission Line Reflection Calculator.Trace Width and Current Capacity Calculator.The areas should also have alarms, fire extinguishers, and a fire emergency plan (see Chapter 11: Fire). Work areas where fluxes are used, stored, and mixed need to be controlled for heat and monitored for concentration of fumes and vapors.Keep necessary emergency supplies at the work site well stocked and accessible to workers. Have an emergency plan that includes first aid treatment and protective equipment for spills, splashes, and exposures.All protective clothing should be clean, available each day, put on before work, and never taken home with you (see Chapter 18: Personal protective equipment). Avoid manual hand soldering if there is an alternative automated manufacturing process available.Use ventilation systems that extract fumes and replace or dilute dirty air with clean air (see Chapter 17: Ventilation). Use extraction ventilation to remove flux fumes as close to the soldering process as possible.See the Index of chemical names to find alternative names for fluxes. ![]() See Learn about chemicals used in your factory and how to find information about other fluxes. The chart includes only some of the flux chemicals that exist. For more on ammonium chloride, see Ammonia and Ammonium Compounds for hydrochloric acid, see Acids. Extractors must be close to the soldering source to remove all the fumes. Water-soluble fluxes are used with lead-free solders.įluxes release dangerous fumes when heated during soldering. ![]() Lead solder was very common before it was banned by the European Union. Flux chemicals are sometimes dissolved in other chemicals, such as isopropyl alcohol, to make a liquid flux solution. Sodium borate is used with any metal containing iron. Hydrochloric acid and zinc chloride are used with zinc-coated iron. Rosin and ammonium chloride are used with tin and tin/lead in electronics. When clean, metal parts stick together much better.ĭifferent fluxes are used for different metals.
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