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Plate material-stainless steel
Source: Time: 2020-04-21 14:08:32 Hit:
Plate heat exchangers are still very common in life, but few people notice the material of plate heat exchangers, what is the plate material?
The material of the plate is generally stainless steel. Stainless steel refers to steel that is resistant to weakly corrosive media such as air, steam, water, and chemically aggressive media such as acids, alkalis, and salts. It is also known as stainless acid-resistant steel. In practical applications, steel that is resistant to weakly corrosive media is often called stainless steel, and steel that is resistant to chemical media is called acid-resistant steel.
There is a certain difference in chemical composition between the two, the former is not necessarily resistant to chemical media corrosion, while the latter are generally stainless. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel.
Corrosion resistance mechanism: Chromium is the basic element for stainless steel to obtain corrosion resistance. When the chromium content in the steel reaches about 12%, chromium and oxygen in the corrosion medium react chemically to form a thin oxide film on the steel surface. Can further prevent oxygen and iron corrosion. Similarly, destroying this film means destroying its ability to resist oxygen corrosion.
In addition, the halogen elements in the corrosive medium (like chloride ions common in water) can also replace the chromium element under certain conditions, so stainless steel will also rust under certain conditions, and will also be in media containing acids, alkalis, and salts Corroded, Therefore, the corrosion resistance of stainless steel changes with the chemical composition of the steel itself, the conditions of use and the type of environmental medium.
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