Has the user ever encountered rust when buying, using or storing stainless steel heat exchange tubes for a long time? So do you know why?
First of all, we need to know that the corrosion resistance of stainless steel heat exchange tubes is mainly because there is a thin layer of chromium-rich oxide film on the surface of the tube. The existence of this oxide film is to protect the stainless steel heat exchange tubes from corrosion and prevent oxygen atoms from continuing to penetrate and oxidize. If this layer of protective film is severely damaged, the corrosion resistance of stainless steel heat exchange tubes will be greatly reduced.
Therefore, Mingxin will introduce to you the reasons
1. Dust containing other metal elements or foreign metal particles is deposited on the surface of stainless steel. When the air is humid, the condensed water between the accessories and the stainless steel will connect the two into a micro battery, resulting in electrochemical reactions and damage to the protective film.
2. Organic juice adheres to the surface of the stainless steel heat exchange tube, and organic acid will be formed under the combined action of water and oxygen, and then the surface of the stainless steel heat exchange tube will be corroded for a long time.
3. Acid, alkali and salt stick to the surface of the stainless steel heat exchange tube, causing local corrosion of the machine.
4. When the stainless steel heat exchange tube is in the polluted air, the condensed water forms sulfuric acid nitric acid and acetic acid spots, causing chemical corrosion.