What are the reasons why the soldering iron head does not eat tin?
1. Poor quality of soldering iron tip
Commonly used cheap internal heating low-power soldering iron. The tip of this internally heated soldering iron is made of copper. Since it does not have a constant temperature function, it cannot adjust the temperature. After this type of soldering iron is powered on for a period of time, the temperature of the tip will become higher and higher, and the copper tip will become higher and higher at high temperatures. It is easy to oxidize and turn black. Even if you polish the soldering iron tip with sandpaper or a file, it will still oxidize and turn black after a while. Therefore, if the soldering iron tip is oxidized and blackened due to the use of the above-mentioned cheap soldering iron, it is recommended to replace the soldering iron. It is best to use a constant temperature soldering iron or an adjustable temperature soldering iron.
2. Use acidic flux or the solder wire contains too many impurities.
Some electronic beginners like to use acidic solder paste as flux when soldering. This flux is slightly acidic and is somewhat corrosive to some inferior soldering iron tips. It is recommended to use block rosin or rosin alcohol solution as flux when soldering. In addition, some cheap solder wires contain more impurities. Using this kind of solder wire will also cause the soldering iron tip to not absorb tin. Because this kind of solder wire has poor wettability and fluidity after melting, its solder joints are dark and not the kind of smooth and bright solder joints. If the soldering iron tip does not absorb tin due to poor solder wire quality, it is recommended to use good quality low-melting point solder wire when welding.
What to do if the soldering iron tip does not stick to tin and how to deal with it
1. If the temperature is too high, the tin surface of the soldering iron tip may be violently oxidized.
2. Do not tin dip the tin surface before use.
3. Use incorrect or defective cleaning methods.
4. Use impure solder or the flux in the soldering wire is interrupted.
5. When the working temperature exceeds 350°C and the welding is stopped for more than 1 hour, the amount of tin on the lead-free soldering iron tip is too small. 6. "Dry burning" the soldering iron tip. For example, if the soldering station is left open and not used, and there is no tin on the surface of the soldering iron tip, it will cause rapid oxidation of the soldering iron tip.
7. The flux used is highly corrosive, causing rapid oxidation of the soldering iron tip;
8. Use neutral active flux and do not frequently clean the oxide on the soldering iron tip.
9. Contact with organic matter such as plastic, lubricating oil or other compounds. Commonly used methods:
Use a knife to scrape off the oxide layer of the soldering iron tip to expose the copper that has not been oxidized by air. Then, put it in the rosin box and dip it in tin, and you can use it normally. However, the removal by this method is not complete. At the same time, if it is scraped off for a long time, the soldering iron tip will become thinner, which will affect the heat transfer, cause the temperature to drop, and even damage the soldering iron tip.
