What circumstances might lead to copper nut be rusted

In the copper processing industry, the demand for copper nuts is very large, so copper nut processing is the most well-known car parts. I believe many people will hear that the copper nuts will rust. The first reaction is: "Copper is not Rusted, rust is not copper, it may be a problem with copper. In fact, this is a certain understanding of the lack of copper, copper will also rust under certain conditions, like the following:

1. In polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, nitrogen oxide), when it encounters condensed water, it will form a liquid point of sulfuric acid, nitric acid and acetic acid, causing chemical corrosion.

2. The surface of the car parts is adhered to organic juice (such as melon, noodle soup, glutinous rice, etc.), and in the case of water and oxygen, it constitutes an organic acid, and the organic acid corrodes the metal surface for a long time.

3. The surface of the copper nut adheres to acid, alkali, and salt substances (such as alkali water and lime water splashing on the wall), causing local corrosion.

4. On the surface of the copper nut, there are deposits of dust or dissimilar metal particles containing other metal elements. In humid air, the condensed water between the deposit and the copper is connected into a micro battery, which causes electrochemistry. In response, the protective film is destroyed, which is called electrochemical corrosion.