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Corrosion Resistance and Common Corrosion Phenomena of Stainless Tube Pipe

With the continuous growth of the social economy, various industries have also entered a period of rapid development. Due to the excellent corrosion resistance and processing performance of stainless steel, it is very suitable for making pipelines for transporting chemicals. Therefore, more and more chemical substances are transported using storage tanks and pipes made of stainless steel. With the gradual increase in the requirements for the quality of stainless tube pipes by the precision steel pipe supplier, strengthening the processing technology of stainless tube pipes is also an inevitable trend.

Because of the existence of oxide film, stainless steel has good corrosion resistance. This is mainly because when the metal is subjected to certain damage during the manufacturing process, the oxide film exists as a protective cathode to prevent the metal from being corroded. Of course, the choice of the chemical metallurgical composition of the stainless steel substrate is also important. The most common corrosion situation of stainless tube pipes are as follows:

Point corrosion of stainless tube pipes

Point corrosion is local corrosion caused by the damage of the oxide film. This is mainly due to the existence of some welding slag or dust on the surface of the steel, which causes some invisible holes in the stainless capillary tube pipe during the manufacturing process. Under the action of the external environment, point corrosion of the stainless tube pipe may occur.

Crevice corrosion of stainless tube pipes

Crevice corrosion occurs during the manufacturing process of stainless tube pipes. There are unavoidable crevices at the joints, gaskets, and the ends of screws. The existence of these crevices may cause localized corrosion of the stainless tube pipe.

Stress corrosion of stainless tube pipes

The phenomenon of stress corrosion in stainless tube pipes is not very common. It is mainly caused by the frequent stretching of the hexagon pipe for sale, which causes cracks on the surface of the stainless steel and leads to stress corrosion.

Intergranular corrosion of stainless tube pipes

The intergranular corrosion of stainless tube pipes is mainly due to the high-temperature deposition of chromium carbide caused by high heat during the heat treatment of stainless steel, which reduces the chromium content in the adjacent area. This part of the stainless tube pipe usually experiences severe intergranular corrosion.

Electrochemical corrosion of stainless tube pipes

It is the corrosion that occurs when stainless steel comes into contact with another alloy in an electrolyte solution and a potential difference is generated. The above-mentioned corrosion phenomena are usually caused by improper maintenance or use, such as high chloride content in stagnant solution stored in the pipeline and incomplete cleaning of the welding seam of the pipe, which leads to the formation of high-temperature oxides on both sides at the root of the welding seam.

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