Brief analysis of the corrosion hazard of chloride ion to the condenser

　　The condenser can be a separate device, such as a heater, cooler and condenser, etc.; it can also be a component of a process equipment, such as a heat exchanger in an ammonia synthesis tower. Due to the limitation of manufacturing technology and technological level, the early heat exchanger (condenser) could only adopt a simple structure, and the heat transfer area was small, bulky and heavy, such as the coil heat exchanger. With the development of the manufacturing process, a shell-and-tube heat exchanger is gradually formed. It not only has a larger heat transfer area per unit volume, but also has a better heat transfer effect. It has become a typical heat exchanger in industrial production for a long time. Heater.

　　Chloride ion itself does not chemically react with stainless steel or other metals, but there will be other cations in water with a large amount of chloride ions, and its conductivity is much higher than that of pure water.

　　Stainless steel is not a completely uniform alloy in a microscopic state, and its surface metal composition is microscopically inhomogeneous. At the same time, it is inevitable that there will be trace impurities such as carbon. These non-uniform or impurity-containing parts will cause galvanic reaction in the environment of high-conductivity solution, which will lead to pitted corrosion.