Reasons and treatment methods of soldering iron tip not sticking to tin

 When using an electric soldering iron for soldering operations, it is often encountered that the tip of the soldering iron is not stained with tin. If the soldering iron tip is not stained with tin, the soldering operation cannot be performed. If used improperly, changing the tip of the soldering iron frequently is also a big expense. In addition to the quality problems of the iron tip itself, I will explain the reasons for the non-sticking of the soldering iron tip and how to repair the soldering iron tip:

■ Reasons why the soldering iron tip does not stick to tin

1. The tip of the soldering iron is mostly made of copper. At high temperature, copper will react with oxygen in the air to form black copper oxide (CuO), and copper oxide does not stick to tin.

     2. If the temperature is too high, the tin attached to the surface of the soldering iron will quickly melt and volatilize, resulting in violent oxidation. High temperature requires more tin.

     3. Use incorrect or defective cleaning methods.

     4. The use of impure solder or flux in the wire is interrupted.

     5. The working temperature exceeds 350 ℃, and the soldering stops for more than 1 hour. The amount of tin on the soldering iron tip is too small.

     Sixth, 'dry burn' soldering iron head, such as: the soldering station is not used, and the surface of the soldering iron head is not tinned.

     7. The flux used is highly corrosive, causing rapid oxidation of the soldering iron tip

     8. The oxide on the tip of the soldering iron is not frequently cleaned.


■ Soldering iron head non-stick tin treatment method


1. Due to surface oxidation, first of all, after heating the soldering iron, rub the oxidized skin repeatedly in the rosin, then dip it with solder.

2. the method of 'burning' the soldering iron tip: heat the soldering iron to normal temperature, and then use a file or sandpaper to grind off the black copper oxide on the surface of the soldering iron tip, then immediately dipped in rosin, and then you can hang tin.

3. It is recommended to use a cleaning sponge and a soldering iron tip cleaner.

4. Guarantee the quality of tin

5.it is recommended to add tin protection when not in use

6. it will cause rapid oxidation of the iron tip.

7. Selected flux. It is recommended to use neutral active flux.

8. Wash the soldering iron tip more

    The outer layer of the electric iron tip is covered with a metal layer that has affinity with the solder melt, which is the so-called long-life soldering iron tip, so you must not use a tool such as a file to remove the surface oxide layer. After that, the soldering iron tip will never be covered with solder and will be scrapped. Only a new one can be used.

    The soldering iron should be placed on the soldering iron rack with the soldering iron head facing down, and the heat will not be concentrated on the soldering iron head, prolonging the service life of the soldering iron head.

    A rectifier diode and a switch are connected in parallel and connected in series on the power line of the electric soldering iron to make such a device, that is, the switch is turned off during the working gap, so that the soldering iron is not cooled down, and the soldering iron head can be placed In the state of heat preservation, close the switch when re-soldering, then the soldering iron can work normally, ensuring that the soldering iron head will not burn out.

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