Corrosion related problems of Seamless Tubing products
During the entire application process of Seamless Tubing products, if Seamless Tubing products corrode, it will affect all normal applications. Why do Seamless Tubing products corrode? Let's take a look together.
1. Pitting. Refers to the corrosion damage mode that occurs in part of the metal surface of Seamless Tubing products. After the cracks are generated, they can quickly develop to deep layers and penetrate Seamless Tubing products. Pitting corrosion is very harmful, especially in various high-pressure containers. When corrosion occurs, it should be sanded or painted immediately to prevent further corrosion.
2. Symmetrical corrosion. This means that all Seamless Tubing products exposed to corrosive environments undergo chemical changes and suffer symmetrical corrosion. This kind of corrosion can accurately measure its corrosion rate, predict and analyze its corrosion degree. Based on accurate measurement results, its safety performance and service life can be set. Therefore, in many types of corrosion, the risk of symmetrical corrosion is not large, and the degree of corrosion of symmetrical corrosion is generally accurately measured and predicted according to the quality of Seamless Tubing products and the thinning of the wall thickness of Seamless Tubing products. Outside of their unique natural environment, Seamless Tubing products have low symmetrical corrosion rates, long service life and low maintenance costs.
3. Intergranular corrosion. It refers to corrosion along dislocations, destroying the connection between crystals. This kind of corrosion is very harmful and will make Seamless Tubing products brittle or lose their compressive strength, which is very easy to cause safety accidents. Intergranular corrosion is the main corrosion method of martensitic Seamless Tubing products. Due to the difference in composition or ground stress between the dislocation region and the crystal, the electrode potential in the dislocation region is significantly reduced, resulting in an electrode potential difference.
4. Fatigue corrosion. Refers to the damage of Seamless Tubing products under the action of corrosive substances and alternating ground stress, manifested as corrosion pits and many cracks. Significantly lowers the fatigue limit of Seamless Tubing products, leading to premature failure. The corrosion fatigue of Seamless Tubing products is not equal to the fatigue of mechanical equipment, it does not have a certain fatigue strength. The fatigue limit decreases as the frequency of the circulatory system increases.