Flux and solder alloy
Too much active flux can cause corrosion. IPC recommends: ROL, REL and ORL. The internal flux of small diameter solder rolls may not be sufficient. Provide compatible external flux if required.
Oxidation
Iron oxide does not wet well and does not transfer temperature (dewetting). The higher the temperature, the greater the risk of oxidation. Always keep the soldering tips tinned when not in use. Use flux for your solder joints. Use the sleep and hibernate functions.
Thickness of the iron coating
Plate wear shortens the service life of the tip (hollowing). Use the cleaning methods specified by the manufacturer. Do not apply too much pressure to the tip.
Correct techniques
Excessive pressure on the soldering surface can cause the tip or plate to break. Do not use as a pointed object or screwdriver. Select the largest possible tip for each application and work at the lowest possible temperature.
Working temperatures
The higher the temperature, the greater the oxidation and corrosion. Work at the lowest possible temperature. Use thermally efficient tools and ensure that the tips are free from oxidation.