It is more common for stainless steel heat exchange tubes to rust. Although the material of stainless steel heat exchange tubes is stainless steel, which has good corrosion resistance and is not easy to rust, this does not mean that it will never rust. If the stainless steel heat exchange tube is not stored properly or exposed to some media that will affect it, it will rust.
Next, let’s talk about the leading factors that can cause corrosion on the surface of stainless steel heat exchange tubes.
1) Dust containing other metal elements or foreign metal particles is deposited on the surface of the stainless steel heat exchange tube. Then in humid air, the condensed water between the accessory and the stainless steel will connect the two as a micro battery, which will trigger an electrochemical reaction and destroy the protective film on the surface of the stainless steel heat exchange tube. This process is called galvanic corrosion.
2) The surface of the stainless steel heat exchange tube adheres to the organic juice (such as vegetables, noodle soup, phlegm, etc.). These juices form organic acids in the presence of water and oxygen, which will corrode the surface of stainless steel heat exchanger tubes for a long time.
3) There are acids, alkalis and salts stuck on the surface of the stainless steel heat exchange tubes. lead to localized corrosion.
4) Stainless steel heat exchange tubes are stored in polluted air (such as containing a large amount of sulfide, carbon oxide and oxidative inflammation). Condensation can form sulfuric acid, nitric acid and acetic acid spots, causing chemical corrosion.
These conditions will destroy the oxide film formed on the surface of the stainless steel heat exchange tube (the oxide film is to protect the stainless steel heat exchange tube from corrosion), resulting in rust.