In the lead-free soldering process of the soldering iron tip, the soldering iron tip may not be tinned. In this case, in addition to the quality problems of the soldering iron itself, we can also find the reasons from the other nine aspects:
1. If the temperature is too high, it is easy to cause severe oxidation of the soldering iron tip to the tin surface.
2. Do not eat tin on the surface of the tin before use.
3. Use incorrect or defective cleaning methods.
4. Use impure solder or wire break in the wire.
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" electric iron head, such as: the soldering station is not used, and the surface of the electric iron head is not tinned, it will cause the electric iron head to quickly oxidize.
7. The flux used is highly corrosive, causing rapid oxidation of the soldering iron tip;
8, using a neutral active flux, do not often clean the oxide on the tip
9. Exposure to organic materials such as plastics, lubricating oils or other compounds. The usual treatment:
A small knife is used to scrape off the oxide layer of the soldering iron tip to expose copper that is not oxidized by air. Then, put it in the rosin box and rub it with tin, then you can use it normally. However, it is not completely removed by this method. At the same time, if it is scraped for a long time, the soldering iron tip will become thinner and affect heat transfer, resulting in temperature drop and even damage to the soldering iron tip.
The quick and efficient way to do this is:
Hold the electric iron handle and immerse the oxidized soldering iron in a container filled with alcohol. After 1 to 2 minutes, the oxide is completely and cleanly removed, and the soldering iron is completely new. This is because when copper oxide and alcohol are heated, a chemical reaction occurs, and copper is reduced, which has no corrosive effect on the soldering iron tip. 
Editor in charge: Zhao Hongli
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