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What should I do if the centrifuge is corroded?
Centrifuges are generally made of stainless steel, so there will be more or less corrosion, then the metal corrosion pattern is mainly divided into two categories: uniform corrosion and local corrosion. The former is easy to find because of the apparent phenomenon, and in most The data in the manual data are relatively clear and will not be described in detail here. Only the latter will be discussed. Localized corrosion only occurs locally, which is an extremely serious and harmful damage, such as pitting corrosion, crevice corrosion, intergranular corrosion, stress corrosion, wear corrosion, etc. In centrifuges, local corrosion is widespread and should be Focus on the analysis of its formation mechanism and take measures to overcome it.
1. Pitting corrosion is a highly corrosive phenomenon. It is mainly found in easily passivated metals, such as stainless steel. Due to possible local defects, there are active ions in the solution that can destroy the passivation film. Passivation film Partially destroyed, forming a pair of galvanic couples, causing pitting corrosion. After the pitting corrosion is formed, due to the centrifugal force, the dynamic process of the galvanic couple in the hole will be accelerated, thereby ensuring the continuity of the hole corrosion until the perforation, which is different from the pitting phenomenon under static.
2. Intergranular corrosion will cause the parts to lose strength and extensibility, causing the parts to be brittle. It is a kind of harmful damage that develops from the surface along the grain boundary and has no signs of corrosion on the outer surface.
3. Wear and corrosion means that the surface of the part is subject to both wear and corrosion damage.
4. Stress corrosion is damage caused by a certain tensile stress in a corrosive environment. It has the following characteristics: residual tensile stress, applied tensile stress, corrosive infiltration environment, local defects. The above four kinds of corrosion are extremely serious against the tk, which may cause serious consequences.
Therefore, the centrifuge must be regularly inspected to prevent the material from corroding the centrifuge.