Stainless steel screens are also stainless steel products that require welding during processing. The processing method of melting the stainless steel partially by high-temperature melting will oxidize the surface of the stainless steel screen welded portion into black ferric oxide and triiron tetroxide, which are very difficult to remove, that is, use Strong acid can't be removed immediately. However, it cannot be soaked for a long time, which will corrode the part without oxidized black iron. Therefore, this kind of oxidized black iron needs to be handled by the manufacturer itself, and it is difficult to remove it to the customer. Some of the more responsible factories will remove the black iron oxide produced by the welded parts themselves.
Of course, if you don't pay attention to it, buy a stainless steel screen with oxidized black iron, or you can use the tool to weld black iron. You can use the following method to remove it: first, take a pointed hammer, then slow It’s ok to knock it off. One thing to note is that stainless steel screens are an ornament. If you don't master the force when you strike, it is easy to cause other inevitable scratches, pits, and so on. Therefore, I would like to remind everyone to pay attention to mastering the strength when removing black iron.