What happens when the protective layer on the surface of the stainless steel heat exchange tube is damaged?
By: mxgy,
Zhejiang Max Stainless Steel Co., Ltd. is a modern stainless steel pipe manufacturing enterprise integrating scientific research, production and sales. The company adopts advanced, efficient and mature production management mode. The company chooses Walsin Lihwa and Yongxing Special Steel parent materials as the leading material for the production of high-quality stainless steel, providing the most reliable and safest stainless steel pipes and fittings for global users.
Max Stainless Steel will discuss with you today about the protective layer on the surface of stainless steel heat exchange tubes. The protective layer on the surface of stainless steel heat exchange tubes is a thin but strong and stable chromium-rich oxide film, also called a protective film. As the name suggests, the protective film is used to protect the surface of the stainless steel heat exchange tube and prevent oxygen atoms from continuing to penetrate and oxidize, so as to play a certain role in corrosion resistance.
If the protective film on the surface of the stainless steel heat exchange tube is continuously damaged, the oxygen atoms in the air or liquid will continue to penetrate, or the iron atoms in the metal will continue to precipitate, forming loose iron oxide, and the metal surface will be damaged. Persistent corrosion.
So what causes the oxide film on the surface of the stainless steel heat exchange tube to be damaged? Here are some more common examples:
1) Organic juice adheres to the stainless steel surface. Organic juices such as vegetables, noodle soup, and phlegm adhere to the surface, which will form organic acids under the action of water and oxygen, which will cause long-term corrosion on the stainless steel surface.
2) Acid, alkali and salt substances adhere to the surface of stainless steel. Like alkaline water and lime water splashed on the decorative wall, it will cause localized corrosion.
3) The surface of stainless steel accumulates dust containing other metal elements or foreign metal particles. In the case of humid air, the condensed water between the metal particle attachment and the stainless steel will connect the two into a miniature battery, resulting in an electrochemical reaction and damage to the oxide film on the surface of the stainless steel. This process is called electrochemical corrosion.
4) Stainless steel exposed to polluted air. The polluted air contains a large amount of sulfide, carbon oxide and oxidized air, so in the case of contact with polluted air, the condensed water will form sulfuric acid, nitric acid and acetic acid spots, and chemical corrosion will occur.
The above points will lead to damage to the surface protective layer of stainless steel heat exchange tubes, so more attention should be paid to avoid these situations during normal storage, and the stainless steel should be wiped regularly to keep the surface clean.
What happens when the protective layer on the surface of the stainless steel heat exchange tube is damaged?
By: mxgy,
Zhejiang Max Stainless Steel Co., Ltd. is a modern stainless steel pipe manufacturing enterprise integrating scientific research, production and sales. The company adopts advanced, efficient and mature production management mode. The company chooses Walsin Lihwa and Yongxing Special Steel parent materials as the leading material for the production of high-quality stainless steel, providing the most reliable and safest stainless steel pipes and fittings for global users.
Max Stainless Steel will discuss with you today about the protective layer on the surface of stainless steel heat exchange tubes. The protective layer on the surface of stainless steel heat exchange tubes is a thin but strong and stable chromium-rich oxide film, also called a protective film. As the name suggests, the protective film is used to protect the surface of the stainless steel heat exchange tube and prevent oxygen atoms from continuing to penetrate and oxidize, so as to play a certain role in corrosion resistance.
If the protective film on the surface of the stainless steel heat exchange tube is continuously damaged, the oxygen atoms in the air or liquid will continue to penetrate, or the iron atoms in the metal will continue to precipitate, forming loose iron oxide, and the metal surface will be damaged. Persistent corrosion.
So what causes the oxide film on the surface of the stainless steel heat exchange tube to be damaged? Here are some more common examples:
1) Organic juice adheres to the stainless steel surface. Organic juices such as vegetables, noodle soup, and phlegm adhere to the surface, which will form organic acids under the action of water and oxygen, which will cause long-term corrosion on the stainless steel surface.
2) Acid, alkali and salt substances adhere to the surface of stainless steel. Like alkaline water and lime water splashed on the decorative wall, it will cause localized corrosion.
3) The surface of stainless steel accumulates dust containing other metal elements or foreign metal particles. In the case of humid air, the condensed water between the metal particle attachment and the stainless steel will connect the two into a miniature battery, resulting in an electrochemical reaction and damage to the oxide film on the surface of the stainless steel. This process is called electrochemical corrosion.
4) Stainless steel exposed to polluted air. The polluted air contains a large amount of sulfide, carbon oxide and oxidized air, so in the case of contact with polluted air, the condensed water will form sulfuric acid, nitric acid and acetic acid spots, and chemical corrosion will occur.
The above points will lead to damage to the surface protective layer of stainless steel heat exchange tubes, so more attention should be paid to avoid these situations during normal storage, and the stainless steel should be wiped regularly to keep the surface clean.
