The forms of metal corrosion are mainly divided into uniform corrosion and local corrosion. Among them, uniform corrosion is not described in detail because of its obvious appearance and detailed description in most manual materials. However, local corrosion is a more serious and harmful form of corrosion, such as pitting corrosion, crevice corrosion, intergranular corrosion, stress corrosion and wear corrosion. stay Centrifuge The phenomenon of local corrosion is widespread, which needs to be analyzed from its formation mechanism, and corresponding measures should be taken to overcome it.
1. Pitting corrosion is a highly corrosive phenomenon, which mainly exists in metals that are easy to passivate, such as stainless steel. Due to the existence of local defects on the surface and the presence of active ions (such as halogen ions) in the solution that can destroy the passive film, the passive film is partially destroyed, thus forming a couple, leading to the formation of pitting corrosion. After the formation of pitting, due to the centrifugal force, the dynamic process of galvanic couple in the hole will be accelerated, thus ensuring the continuity of pitting corrosion until perforation. This is different from the pitting phenomenon under static state.
2. The intergranular corrosion will lead to the loss of strength and extensibility of the parts and cause brittle fracture of the parts. It is a kind of harmful damage that develops inward from the surface along the grain boundary and has no corrosion signs on the outer surface.
3. Wear corrosion means that the surface of parts is subject to wear and corrosion damage at the same time.
4. Stress corrosion is the damage caused by certain tensile stress in corrosive environment. It has the following characteristics: residual tensile stress, external tensile stress, corrosive infiltration environment, local defects.
The above four kinds of corrosion have extremely serious impact on the centrifuge, which may lead to serious consequences. Therefore, in order to reduce the impact of these corrosion on the centrifuge, it is necessary to deeply understand its formation mechanism and take effective measures to prevent and protect it.
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