Preventive measures against oxidation:

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Clean one side of the base.
The instrument is deeply immersed in rosin and the edge is rubbed against wood.
Contact with wood is made at a place where solder has been prepared in advance. The procedure is repeated several times.
They are engaged in the second facet.
The round surface of the rod is tinned.
The procedure will take at least 10 minutes. The large amount of time spent on preparation pays off because you can work with the tool for several days without any special preparation.

Long-term work will cause overheating. Increased investor data increases oxidation and the rod has to be prepared for work more often. In order to avoid unnecessary procedures, you should follow some rules.

Maximum power cannot be used continuously.
The temperature regulator in the soldering station should be set to the minimum possible value.
Experienced craftsmen equip the soldering iron stand with a switch with a voltage limiter - when the tool is not in use, the heating is maintained and the coating does not oxidize.
After each soldering, the coating should be restored.
The tool should always be kept ready. After a long period of inactivity, the soldering iron tip does not tin due to strong oxidation. Restoration of the coating adhesion, especially of copper, is carried out with rosin. After immersion in it, the tip is rubbed with a cotton cloth. During operation, the soldering iron also needs to be cleaned periodically.

Features of the soldering iron tip
The tip is the main working part of the tool, which comes into contact with all the parts, solder, workpieces, etc. It heats up itself and melts all the consumables at the right temperature. Despite the fact that this part is made of durable metals that have a high melting point and good resistance to chemical attack, you need to know how to properly tin the soldering iron tip, since an oxidizing film begins to form on top of it. It is not visible without special devices, but the effect of the presence of this film becomes noticeable, since the molten solder does not remain on the tip, but simply spreads over it and falls down. It is impossible to take the required amount of material and carefully place it in the required place. Tip preparation is necessary not only for old devices that have been in operation. You need to know how to tin a new soldering iron, since this oxide can also form on it.