What are the causes of rust on geological drilling pipes?

Although the main material of geological drilling pipes is stainless steel, rust and corrosion can still appear on the surface of the pipe fitting after prolonged use in humid conditions. Severe rust will shorten the service life of the pipe fitting. To fundamentally avoid rusting, we need to first understand the causes of the problem.

While the main material of geological drilling pipes is stainless steel, rust and corrosion can still occur on the surface of the pipe after prolonged use in humid conditions. Severe rust will shorten the service life of the pipe. To fundamentally prevent rust, we need to understand the causes of rust. The following are some of the main reasons for rusting:

　　1. Chloride Ion Corrosion:

　　Geological drilling pipes have good corrosion resistance, but if the usage environment contains a large amount of chloride ions, the corrosion resistance of the pipe will weaken, leading to rust.

　　2. Lack of Solution Treatment:

　　Although the main material of the pipe is stainless steel, it still contains other metallic elements. If the pipe is not solution-treated during processing and production, the metal content in the pipe matrix will decrease, and the corrosion resistance will deteriorate.

　　3. Inherent Intergranular Corrosion:

　　The pipe does not contain titanium and niobium, so intergranular corrosion will occur inside. Welding and other operations further exacerbate this intergranular corrosion.

　　As mentioned above, the rusting of geological drilling pipes is caused by multiple factors. Therefore, during the processing and production of the pipe, attention should be paid to its usage environment and processing technology. Use in environments with high chloride ion concentrations should be avoided to minimize the occurrence of rust.