How can corrosion-resistant chemical pumps prevent daily corrosion?

May 20, 2019

How can corrosion-resistant chemical pumps prevent daily corrosion?

When it comes to chemical pumps, it is becoming more and more widely used in industrial production. Especially in the chemical industry, corrosion-resistant chemical pumps are playing an increasingly important role. Usually, due to the special environment of the chemical pump, it is made of metal or fluoroplastic F46. Its structure is extremely prone to corrosion and the external environment for ordinary metals, such as temperature, humidity, and air. It will directly lead to the corrosion of metals, so the common materials for corrosion-resistant chemical pumps are stainless steel and fluoroplastic F46.

The mediums used in chemical pumps are basically corrosive, and for the classification of corrosion, there are generally two classification methods. One is classified according to the mechanism of corrosion generation, and the other is classified according to the cause and appearance of corrosion. According to the mechanism of corrosion, it can be divided into electrochemical corrosion and chemical corrosion. Electrochemical corrosion mainly refers to the corrosion phenomenon of metal materials after contact with the electrolyte solution, caused by surface electrode reactions. This reaction is generally a redox reaction. The main factors are environmental humidity and temperature problems; Chemical corrosion means that the metal surface is in contact with the surrounding medium, and a relatively strong chemical reaction occurs, which causes the metal to be damaged. Therefore, the corrosion is mainly caused by high temperature and dry environment. According to the appearance and cause classification of corrosion, it can be divided into stripping corrosion, industrial atmospheric corrosion, high-temperature oxidation corrosion, and marine atmospheric corrosion.

In those environments where industrial pollution is relatively serious, there are many volatile substances such as sulfides, carbon dioxide, and hydroxides in the air and some industrial dust, which are easily corroded media. These media are in a humid environment, and acid gases combine with water to form inorganic acids. These acids have strong corrosive properties and therefore cause corrosion. In an industrial atmosphere, equipment is caused by a combination of electrochemical and direct chemical corrosion. The essence of all corrosion is actually an oxidation process in which metal elements form ions after losing electrons. The main difference between electrochemical corrosion and industrial atmospheric corrosion is the difference in the environment in they occur.

Corrosion of equipment is closely related to the material of the equipment. In the process of selecting chemical materials, it is necessary to focus on the situation of corrosion, pay attention to the rational selection of materials, and fully consider the nature of the medium, the temperature of the environment and the pressure of operation, etc., according to the chemical industry. The requirements of the raw materials design the structure and type of equipment. The structure's design should focus on the production requirements and stress characteristics of the production and operation of chemical equipment. You should pay attention to the following aspects in the design: First, the structural requirements of the product should be consistent with the corrosion resistance requirements of the chemical products produced; It is necessary to pay attention to the operational stability and fluency of chemical equipment, to prevent the pause of the medium with corrosive properties, the insufficient uniformity of heat load distribution, and the condensation of steam and the accumulation of corrosion products. Finally, you should pay attention to protecting external forces to prevent Fatigue corrosion caused by alternating stress.


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