Component of common flux:
1. Solvent: It enables uniform and effective mixing of various components in the flux; currently solvent is mainly based on alcohol, such as ethanol, isopropanol, etc., although the price is low, The human body has a strong toxic effect, so the methanol has rarely uses a formal flux manufacturer.
2, surfactant: high-efficiency surfactant such as alkane or fluorocarbon.
3. Activator: The organic acid or organic acid salt is mainly used, and the inorganic acid or inorganic acid salt is substantially free in electronic flux, and sometimes it is sometimes used in other special flux.
4, rosin (resin): rosin itself has certain activation, but it is generally used as a carrier when adding to flux, which can help other components have effectively active.
5. Other additives: Except for the above components, flux tends to add different additives, such as brighteners, matting agents, flame retardants, etc. according to specific requirements.
Simple production flux
The most commonly used flux is rosin and rosin water. Rosin can be used directly as a flux when soldering, and its main ingredient is C20H3002, which is a weak organic acid having an acid value of about 160, and the melting point is from 172 to 1739c. The rosin has yellow, brown, brown rosin, more impurities, light yellow, good transparency, and pure rosin.
Roset water often applies to the surface of the printed circuit board for flux, as well as the flux during welding. Under the spare circumstances, it is possible to use alcohol (content of 99.5%, boiling point 77 ~ 799c) with rosin. Its ratio is 4: 1. The specific method is that after the selection of good rosin is placed in the container, pour alcohol in the proportion, and use a little rod to make the rosin quickly dissolve in alcohol. For example, in winter or urgent, the matching rosin container can be placed in the water of 80 ~ 90c, and it is constantly using a small stitling, and the rosin can be quickly dissolved in alcohol. After the spandem is dissolved, the rosin water flux will be reported. success.
If the loose water is not finished, it can be placed in a covered bottle. It is very convenient. It has been convenient. The day is long, alcohol ingredients are reduced due to evaporation, and the appropriate amount increases.
Be
Method for making alcohol, rosin flux
Be sure to match a certain ratio and pay attention to safety.
1. Brave the rosin (just make the loosening of the powder into the powder), so that it is a powder, plus anhydrous alcohol, and produces rosin alcohol solution.
2, find a glass jar, the bottle mouth should be sealed, put the mash (grinding or crushing) rosin powder into the bottle, slowly add anhydrous alcohol (can't use medical alcohol), gently shake, make the rosin The powder is dissolved in alcohol, and the loosol is not tight. Just see that there is a loose deposit, it is too thin, it is not too much alcohol. If you want to save your alcohol, you will put alcohol into the bottle of the rosin powder, then twist the cap, don't screw too tight, otherwise you can not open, place it, if you can't see the loose, then the rosin powder Less, continue to join until you see a precipitate.
3, the above is the easiest way of making, in fact, there are some micro reagents if they can be configured, and the effect will be better.
Each reagent ingredient and action statement in the solution:
Alcohol 40% (corrosion)
Strong 40% (soldering)
Triethanol is 10% (raising gloss)
6% oxygen acid (oxidation of corrosion)
4% of the sain oil (softening loose)
4, use: use plastic eye drops (in the mouth of skim cotton) to inhale rosin alcohol solution, squeeze a few drops when soldering, dropped on the solder joint, very easy to use, do not use it, to cover the plastic eye drops Bottles; you can also use ink jars of inkjet printers to make sake solutions, which is better. I have used it for many years, very easy!
5, pay attention to the seal and save! If you accidentally stick to your hand, use alcohol to clean it, you can't enter! Remember to stay away from children, put them in the place where the child can't get it, pay attention to safety.
Working principle of flux:
The working principle of flux is very easy to understand, in general: During the entire welding process, flux protectors through its own active substance, remove the oxide layer of the welding material, while allowing tin liquid and soldered The surface tension is reduced, enhances the flow of tin liquid, and the performance of the infiltration, helps the welding, so its name is "flux".
If a full analysis is to be performed on the working principle of the flux, the activated substance is cleaned by the activated substance in the flux, so that the solder alloy can be well combined with the soldered material and form a solder joint, in this process Among the main functions, the substances such as activators in the flux can quickly remove the oxides of the pads and the element pins, and sometimes protect the welding material until the welding is not oxidized before the welding is completed.
Further, while removing the oxide film, the surfactant in the flux also begins to operate, which significantly reduces the surface tension of the liquid solder in the surface of the weld material, enhances the fluidity and spread capacity of the liquid solder, and It is ensured that tin solder can penetrate to each subtle brazing slit; in the solder bracket, when the solder is separated from the surface of the tin liquid, the excess tin solder will follow the pin in the wett of the solder. Slow, thereby avoiding adverse phenomena such as tip, welding. , Reading the full text, the technology area
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