启航彩When chemical pumps transport acids and bases, it is crucial to determine the material, because it is directly related to the service life, operating efficiency and safety of the pump. Here are a few key factors to consider when determining materials, illustrated with relevant numbers and information from the reference article:

启航彩Properties of liquid:

Corrosiveness: First of all, the corrosiveness of acid and alkali liquids needs to be considered. For example, stainless steel made of 304 will corrode and cause stress corrosion cracking when the alkali content is 50% and the liquid alkali temperature is between 100 and 200 degrees. Although stainless steel made of 316 material can transport alkali liquid and caustic soda media, it may also cause corrosion under certain concentrations and temperatures.

Concentration and temperature: Different concentrations and temperatures have different effects on the corrosiveness of materials. For example, 316 stainless steel may corrode when the alkali concentration is 30-50% and the temperature exceeds 100 degrees Celsius, and when the concentration is 80% and the temperature exceeds 100 degrees Celsius.

启航彩Working conditions:

Temperature, pressure, flow: these parameters influence the choice of material. Some materials may not perform well under high temperatures, pressure, or flow.

Cost and reliability:

High-strength, highly corrosion-resistant materials typically cost more, but may provide greater reliability and longer service life. For example, fluoroplastic materials (such as polyperfluoroethylene-propylene FEP) will not cause any corrosion at any concentration of liquid alkali and caustic soda and at a temperature of 200 degrees Celsius, but the cost may be relatively high.

Material type:

启航彩Plastics: such as polypropylene, polyvinyl chloride, polytetrafluoroethylene, etc., have good corrosion resistance and wear resistance, and are suitable for transporting highly corrosive chemicals.

Metal: including stainless steel, titanium alloy, nickel alloy, etc., with high strength and good corrosion resistance, suitable for high temperature and high pressure working conditions.

Ceramics: such as alumina, zirconia, etc., have extremely high hardness and wear resistance, and are suitable for transporting high-concentration chemical substances.

启航彩When selecting the material for chemical pumps to transport acids and bases, a preliminary screening should be conducted based on the properties of the liquid (such as corrosiveness, concentration and temperature). Then consider the working conditions of the pump (such as temperature, pressure, flow) and factors such as cost and reliability to make trade-offs. Common materials include plastic, metal, and ceramics, and each material has its specific applicable scenarios, advantages and disadvantages. Therefore, comprehensive considerations need to be made based on specific circumstances when selecting to ensure the safe operation of the pump, improve production efficiency, and reduce maintenance costs.