Centrifuges of various laboratory scales are used in chemistry, biology and clinical medicine to separate suspensions and immiscible liquids. They differ greatly in speed, capacity, temperature control and other characteristics.

Another application of the laboratory is blood separation, which separates blood into cells, proteins, platelets, and serum. DNA preparation is another common application of pharmacogenetics and clinical diagnosis. Purifying DNA samples, preparing DNA by adding buffer solution for separation, and then centrifuging it for a certain time to remove blood waste, and adding another buffer solution to rotate in the centrifuge again, the particles can be suspended, protein can be removed, and the whole substance can be centrifuged again, and finally DNA can be completely separated.

The local corrosion of the centrifuge only occurs locally, which is an extremely serious and harmful damage, such as pitting corrosion, crevice corrosion, intergranular corrosion, stress corrosion, wear corrosion, etc.

1. Pitting is a highly corrosive phenomenon, which mainly exists in metals that are easy to be passivated, such as stainless steel, etc. Due to the possible defects on the surface locally, there are active ions (such as halogen ions) in the solution that can damage the passivation film, and the passivation film is locally damaged, thus forming a couple, causing pitting corrosion. After the formation of hole corrosion, the dynamic process of electric couple in the hole will be accelerated due to the effect of centrifugal force, so as to ensure the continuity of hole corrosion until perforation, which is different from the hole corrosion phenomenon under static state.

2. Intergranular corrosion will cause the parts to lose strength and ductility, and cause brittle fracture of parts. It is a kind of harmful damage that develops from the surface along the grain boundary to the inside, and there is no corrosion sign on the outer surface.

3. Wear and corrosion means that the surface of the part 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 penetration environment, and local defects.