9 reasons why the soldering iron tip does not stick to tin
During the lead-free soldering process of the soldering iron tip, sometimes the soldering iron tip does not stick to tin. In addition to the quality problems of the soldering iron head itself, we can also find the reason from nine other aspects:
1. If the temperature is too high, it is easy to cause severe oxidation on the tin surface of the soldering iron tip.
2. Do not eat tinned surface before use.
3. Using incorrect or defective cleaning methods.
4. The use of impure solder or flux interruption in the wire.
5. When the working temperature exceeds 350°C and the soldering 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 soldering iron tip, such as: the soldering station is not in use, and there is no tin on the surface of the electric soldering iron tip, which will cause rapid oxidation of the electric soldering iron tip.
7. The flux used is highly corrosive, which causes rapid oxidation of the soldering iron tip;
8. Use neutral active flux, and do not often clean the oxides on the tip of the soldering iron
9. Contact with organic substances such as plastics, lubricating oil or other compounds. The customary approach:
It is to 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, then dip it in tin, and it can be used normally. However, this method does not remove it thoroughly. At the same time, if it is scraped off for a long time, the tip of the soldering iron will become thinner and affect heat transfer, resulting in a drop in temperature and even damage to the tip of the soldering iron.
A quick and efficient way to do this is:
Holding the wooden handle of the electric soldering iron, immerse the oxidized soldering iron tip in a container filled with alcohol, take it out after 1 to 2 minutes, the oxide will be completely and cleanly removed, and the soldering iron tip will look brand new. This is because after the copper oxide and alcohol are heated, a chemical reaction occurs, and the copper is reduced, which has no corrosion effect on the tip of the electric soldering iron.
Why can't the surface of the lead-free soldering iron tip be tinned? Because of the following conditions, the tip of the soldering iron will produce carbides and rapidly oxidize the tip of the soldering iron, resulting in non-stick tin.
1. The tip of the soldering iron is under high temperature for a long time.
2. The tip of the soldering iron should be tinned for protection when the operation is completed.
3. During the welding process, the plastic parts were not cleaned up in time.
4. Scrub the soldering iron tip on a dry or unclean sponge or cloth.
5. Whether the tip of the soldering iron is covered with carbonized flux.
6. Poor plating or solder or the soldering surface is not clean.
How to restore a lead-free soldering iron tip that is not tinned? The following methods can be used:
1. Lower the temperature of the soldering station to about 280 degrees, put the tip of the soldering iron on a damp sponge to wipe it repeatedly and uninterruptedly apply new tin for protection, repeat the above actions until the lead-free soldering iron tip is bright and tinned.
2. Turn off the power supply of the soldering iron, use a blade or fine sandpaper to polish off the dirt and oxides on the tinned surface of the soldering iron tip, then put the soldering iron tip into rosin or rosin paste, turn on the power supply of the soldering iron, and adjust the temperature to about 280 degrees. Let the tip of the soldering iron be heated in rosin, and then tin the tip of the soldering iron with solder wire. After tinning, find a strand of copper wire or a tin-absorbing wire, and let the tip of the soldering iron repeatedly rub against the copper wire until the solder is full of the entire soldering iron.
3. Adjust the temperature of the soldering iron to 300-360 degrees, insert it into the special soldering iron tip repair paste, wait a few seconds and then tin the soldering iron tip with solder wire.
