Tubing joints are made of metal, and there are four main methods for metal corrosion protection, namely, the performance of the material itself, the use environment, the interface between the material and the environment, and plans to improve corrosion. Using an alloy that does not lack corrosion resistance to make tubing joints is not economically practical, unless there are special needs or the appearance of tubing joints is completely isolated from corrosive environmental factors.

In practice, this may not be feasible and may be very difficult. The improved metal structure planning can improve the impact of special situations under certain conditions, but most tubing joint planning cannot be completely modified, and its protective effect is very large. Therefore, this method basically cannot solve the problem. As long as the metal interface is corroded, that is, the appearance anti-corrosion treatment is a widely used method.

The anti-corrosion treatment of the surface of oil pipe joints refers to applying a protective layer to the metal surface by various methods. Its function is to isolate the metal from the corrosive environment, prevent the occurrence of corrosion, or reduce the contact between the corrosive medium and the metal surface. Designed to avoid or mitigate corrosion.

The protective layer should meet the following requirements: 1. Corrosion resistance, wear resistance, and high hardness; 2. Dense tissue, no defects, small pores; 3. Firm, strong adhesion to substrate; 4. Evenly distributed and thick.

The protective layer for tubing joints is usually divided into two types: metallic coating and non-metallic coating. Metal plating refers to the formation of a protective layer on the surface of easily corrosive metals using metals or alloys with strong corrosion resistance. This coating is also known as electroplating.

There are many methods and varieties of metal coating. Electroplating is a commonly used method, followed by molten metal immersion plating (hot dip plating and chemical surface treatment). Non metallic plating refers to the use of organic polymer materials such as paint and inorganic materials on pipes, such as ceramic joints or the formation of a protective layer on the stainless steel surface of parts, which can insulate the substrate from environmental media and prevent corrosion of pipe joints due to contact with standard stainless steel media.