Corrosion type of corrosion-resistant multistage pump
1. Stress Corrosion Stress corrosion refers to a type of local corrosion caused by the combination of stress and corrosive environment. Stress corrosion is more likely to occur in C1-media. As the Cl- content, temperature and stress rise, the stress corrosion is more likely to occur. Generally, stress corrosion does not occur below 70--80 °C. Measures to prevent stress corrosion of corrosion-resistant multistage pumps are austenitic Cr-Ni steels with high Ni content (Ni>25% to 30%), or duplex stainless steels.
2. Wear and corrosion Refers to a kind of erosion corrosion of a high-speed fluid on a metal surface. Fluid Scour Wear Corrosion is different from the abrasion caused by solid particles in the medium. Different materials have different wear and corrosion resistance properties. The anti-wear corrosion performance is in order of poor to good: ferrite Cr steel
3. Cavitation corrosion Corrosion caused by cavitation in corrosion-resistant multi-stage pumps is called cavitation corrosion. The most practical and convenient way to prevent cavitation corrosion is to prevent cavitation. For corrosion-resistant multi-stage pumps where cavitation often occurs during operation, cavitation resistant materials such as cemented carbide, phosphor bronze, austenitic stainless steel, 12% chrome steel, etc. may be used to avoid cavitation corrosion.
In fact, corrosion damage is often the result of the combination of the above various types of corrosion, and a number of factors must be considered in the selection of materials.
