The reason why the tip of the electric soldering iron does not eat tin because of oxidation
The issue of burning the soldering iron's tip is the most terrifying one to face while using an electric soldering iron. The methods that have been compiled throughout the years will be shared in the following when dealing with this situation.
We must first understand the cause of the electric soldering iron's failure to consume tin in order to avoid the tip from burning to death. The soldering iron tip is primarily not eating tin because it has been empty for a considerable amount of time. Friends who are new to the technology of electronic welding frequently make this error. The soldering iron tip heats up to a very high temperature of about 380 degrees while burning in that air when it is empty.
It is divided into two situations, depending on whether the soldering iron tip is copper metal or iron metal, the consequences are different.
(1) The soldering iron head is copper metal
It will chemically react with the oxygen in the air and form black copper oxide on the surface. If the solder is melted, there will be a spherical liquid of tin on the surface of the old iron head. If the oxidation is serious, it will not stick to the tin at all. This is the so-called " Soldering iron tips don't eat tin".
(2) The soldering iron head of the electric soldering iron is iron metal
Due to long-term empty burning, it will turn into black ferric oxide. This metal is also very unpalatable to tin.
2. How to deal with soldering iron tip not eating tin
The soldering iron tips usually used are copper, and there are also soldering iron tips made of alloys. This soldering iron tip is mainly composed of five metals: copper, iron, nickel, chromium, and tin.
For the copper soldering iron tip, when it is oxidized, the surface of the soldering iron tip can be polished with sandpaper because the copper is relatively soft. When it's solderable temperature, give the tip some tin at the end so it's ready to use. When using a copper soldering iron tip, it will also be found that this type of soldering iron tip will have a groove in the center of the soldering iron tip due to thermal corrosion. Polished to a bright finish.
For soldering iron tips made of copper alloy, when the degree of oxidation is not high, you can also use sandpaper to polish the surface of the soldering iron tip, then heat it and dip it with rosin and tin. In use, you will find that if the soldering iron tip is burned for a long time and the temperature is high, when the temperature reaches 470 degrees, the degree of oxidation of the soldering iron tip will increase, resulting in a very thick oxide layer. At this time, sandpaper will not help. You must use a small The file needs to be sharpened against the tip of the soldering iron.
In addition, for the long-life electric soldering iron tip made of iron-nickel alloy, it is not possible to use sandpaper or a file to clean its surface. Here, it should be scrubbed with a special tin cloth or a damp cloth under heating. You can use a magnet to judge whether the soldering iron tip you are using is a long-life soldering iron tip. Just put the soldering iron tip on the surface of the magnet. If the two have a magnetic force, it is a long-life soldering iron tip. If not, it is an ordinary soldering iron. head.
In extreme cases, the entire tip of the soldering iron tip will be oxidized, and the soldering iron tip cannot be tinned with sandpaper and files. In this case, it is necessary to consider replacing the soldering iron tip. There are no salvage measures available.
