Corrosion causes
1.Chemical corrosion
Medium role:Centrifuges in the operation process, may be exposed to media such as acids, alkalis, salts, etc., will be chemically reacted with the material, resulting in corrosion. Different materials have different corrosion resistance to specific media, for example, although the surface of the aluminum rotor has an anodized oxide protective film, but it is easy to be scraped by sharp and hard objects, and it is easy to be affected by acids, alkalis and high concentrations of salt.
Oxidative corrosion: centrifuges in long-term storage or operation process, by the role of oxygen and moisture, oxidative corrosion will occur. Especially in high temperature, high humidity environment, oxidative corrosion is more significant.
2. Stress corrosion
Mechanical and chemical joint action: in the stress (such as the role of centrifugal force) and corrosion medium under the joint action of the material surface will produce local corrosion spots, which in turn reduces the mechanical properties of the material, leading to stress concentration, and ultimately may trigger stress corrosion cracking. Stress corrosion is the main cause of aluminum alloy rotor scrap.
3. Other factors
Material selection: different materials have different sensitivities to corrosion, improperly selected materials will accelerate the corrosion process, construction quality: the cleanliness and smoothness of the equipment in the construction process, as well as fasteners, gaskets, and other materials will affect the quality of the corrosion occurs.
Corrosion effects
Decrease in equipment performance:Corrosion can lead to dimensional changes and increased surface roughness of centrifuge components, thus affecting the operational accuracy and stability of the equipment.
Shortened life: Corrosion accelerates the loss and destruction of materials, resulting in a shortened life of the equipment.
Safety hazards:Severe corrosion may lead to equipment parts fracture, leakage and other safety accidents.
Anti-corrosion measures
1. Material selection:According to the working environment and use requirements of the centrifuge, choose suitable corrosion-resistant materials. For example, titanium rotor has good chemical corrosion resistance in a wide PH range.
2. Surface treatment: carry out surface treatment on the key parts of centrifuge, such as anodizing, plating, etc., in order to improve its corrosion resistance.
3. Anti-corrosion coating: apply anti-corrosion coating, such as epoxy, polyurethane, acrylic, etc., on the easy-to-corrode parts of the centrifuge, in order to isolate the corrosive medium from direct contact with the material.
4. Regular maintenance: regularly check the corrosion of the centrifuge, timely cleaning and replacement of corrosion-prone parts. Centrifuges operating in high temperature, high humidity environment should increase the frequency of inspection.
5. Improve the operating environment: through the control of temperature, humidity and other parameters, reduce the corrosiveness of the operating environment of the centrifuge. For example, set up dehumidification equipment around the centrifuge to reduce air humidity.