Corrosion of heat exchanger units​ is a common phenomenon. The phenomenon and mechanism of metal corrosion are more complex, and the scope involved is very wide. According to the reaction mechanism, metal corrosion can be divided into two categories of chemical corrosion and electrochemical corrosion. According to the appearance of corrosion characteristics, metal corrosion can be divided into two categories of comprehensive corrosion and local corrosion. Below we introduce several common corrosion phenomena of heat exchanger units.

The displacement heat exchanger is the use of cold and hot fluids alternately flow through the heat storage chamber in the heat storage body (packing) surface so that the heat exchange heat exchanger, the inter-wall displacement heat exchanger cold and hot fluids are separated by a solid inter-wall,