small dry screw vacuum pump
Small dry screw vacuum pump for introduction to anti-corrosion coating
The corrosive gas of small dry screw vacuum pumps is a very tricky problem, and various industries such as chemical and pharmaceutical industries will have corrosion to some extent. As is well known, dry screw vacuum pumps are mostly treated with cast iron and coating, and there are also stainless steel screws. These anti-corrosion treatments have their own shortcomings when facing various corrosive materials, which requires treatment in the design of the unit.
Based on previous usage experience, cooling the gas before entering the screw pump can achieve good results. Corrosion is greatly affected by temperature. When the temperature drops, not only does it reduce the corrosion of the pump body, but it also reduces the total amount of gas condensed from some materials. This can lower the total gas volume of the vacuum pump, allowing for the selection of a smaller power dry screw vacuum pump. Not only does it reduce corrosion, but it also saves energy and costs. Overall, it is very important to set the front cooling.
Introduction to anti-corrosion coating for small dry screw vacuum pump:
1. Introduction to UNS S32205 duplex stainless steel (medium alloy duplex stainless steel)
The duplex stainless steel UNS S32205 for small dry screw vacuum pumps has chromium content (22%), molybdenum content (3%), and nitrogen content (0.18%). The corrosion resistance of UNSS32205 is superior to 316L and 317L in most environments. UNSS32205 duplex stainless steel has strong resistance to point corrosion and crevice corrosion in oxidizing and acidic solutions. UNS S32205 adopts solution heat treatment, and as the solution temperature increases, the proportion between the two phases in duplex stainless steel changes, resulting in an increase in precipitated phases and thus improving corrosion resistance.
Scope of application: Suitable for organic acids with weak acidity and good corrosion resistance. It has good corrosion resistance at various concentrations and temperatures in the acetic acid process.
2. UNSS32750 duplex stainless steel (super duplex stainless steel)
The high chromium and molybdenum content of the super duplex steel used in small dry screw vacuum pumps gives it strong resistance to overall corrosion by organic acids such as formic acid and acetic acid. Super duplex steel also has strong corrosion resistance to inorganic acids, especially those containing chlorides. Super duplex stainless steel has stronger corrosion resistance to diluted sulfuric acid mixed with chloride ions, and is also used in diluted hydrochloric acid environments, with strong resistance to spot damage and crack corrosion.
Scope of application: Resistant to organic acids such as formic acid and acetic acid; Resistant to inorganic acids containing chlorides; Resistant to sulfuric acid mixed with chloride ions; A small amount of diluted hydrochloric acid can be used.
A new breakthrough has been made in the coating of small dry screw vacuum pumps, which has greatly improved the coating of the pump chamber and screw. Polyether ether ketone (PEEK), also known as polyetheretherketone in English, is a linear aromatic polymer compound containing chain links in the molecular main chain. Its constituent unit is oxygen para phenylene oxygen carbonyl para phenylene, and it is a semi crystalline thermoplastic.
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