It barely smokes, it doesn’t smell bad, and it didn’t discolor. Is it any good? Actually, it beats a lot of the commercial flux off contenders. We added just a few drops, but skip it without worry. ![]() Glycerin is optional, but is said to prevent the rosin from burning and discoloration under high heat. Starting to thicken a bit, like cooking oil It should be 96%, not lower strength 70% rubbing alcohol. One thing the video doesn’t mention is the alcohol strength. The nearest drug store had both isopropyl alcohol (96%) and glycerin. ![]() We powdered it in an envelope with a hammer to it would dissolve faster. Ignoring the Cationic flurocarbon surfectant, everything is readily available.Ī reader donated a kilo of craft rosin, but you can find it a craft and music stores. Liquid flux is produced using a 20-65% concentration of rosin at concentrations of 65-80% of rosin, a paste flux is produced.Cationic flurocarbon surfectant (0.01-1% by weight).Followup comments revealed an expired patent with a simple flux recipe: It’s also the primary ingredient in many fluxes. Rosin is an inexpensive processed tree sap, used on violin bows, art, etc. In previous videos we compared different types of commercial flux ( Flux off 1, Flux off 2), but did you know it’s possible to make a simple and effective flux at home? We’ll get you started, and don’t miss the giveaway at the end of the video.Īrhi shared his method of dissolving rosin into a solvent. Or, read about our Reliability Engineering Services.Flux is a wonderful goo that makes soldering faster and easier. To learn more about improving electronic reliability, register for the webinar - Flux Residue: Key Factors Causing Electronics Failures. This is because there are numerous factors affecting risk, including: Engineers can use current limiting to reduce the damage from shorting, which could hide any evidence of residue-causing failures.Įngineers will need to rely on the knowledge of their design, end-use environment and cleanliness data to assess risk. In these cases, failure is typically linked to leakage or shorting. Unfortunately, there isn’t a standard pass or fail criterion for ion chromatography results.Įngineers can also perform functional testing to assess how a design will perform in humid, worst-case environments. To detect acids in a smaller area, engineers will need to use more localized sampling methods. For instance, a full-assembly soak will provide concentration averages across the surface. One challenge to ion chromatography is that different methods will produce different results. The additives may increase reliability, but there is no way to gain insights or controls into their functionality due to the manufacturer’s intellectual property protections. If any solvent remains, electronics failure is possible.Īdditives - plasticizers, dyes or antioxidants - compose a small portion of the chemical composition of a flux. During application, it’s important to follow the profile to ensure all of the solvent is evaporated away. The manufacturing-recommended soldering profile is based, in part, on the solvent’s boiling point. The solvent is used to dissolve the other constituents. To maintain the appearance of resin-free, clean assemblies, many engineers choose a flux formulation with low concentrations of binders - potentially increasing the risk of failure. The binders form the bulk of the visible residue. After soldering, they prevent unconsumed activators from dissolving in water. The binders, sometimes called vehicles, are insoluble-in-water compounds with high melting points (such as natural rosin and synthetic resins). To reduce the risk, engineers need to use a minimum amount of flux for proper soldering. When this happens, the excess acid can cause electronic failure. Sometimes, the acid may not be fully consumed. ![]() After a wetting process, the salts dissolve and a metallurgical bond is formed. The acids react with metal oxides to form metal salts. Their acidity poses a risk but is required for a good joint. Activators are weak organic acids that are found in contemporary fluxes.
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