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What are the main causes of rusting caused by embosed tube?

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The embossing tube has the ability to resist atmospheric oxidation --- that is, stainless, but also has the ability to contain acid, alkali, salt. The ability to corrode in the medium --- that is, corrosion resistance. But the size of its corrosion resistance is with its steel. The chemical composition of the body, the state of addition, the conditions of use and the type of environmental medium are changed. such as 304 stainless steel Capillary, in a dry and clean atmosphere, has excellent corrosion resistance, but move it to the coastal area In the sea fog, which contains a lot of salt, it will rust quickly; while the 316 steel pipe performs well. Because This is not any kind of stainless steel, which can resist corrosion and rust in any environment.
        embossing tubeIt is a very thin, strong and fine stable chromium-rich oxide film formed on its surface (protective film ), to prevent the oxygen atom to continue to penetrate, continue to oxidize, and obtain the ability to resist corrosion. Once there's some sort This film is constantly destroyed, and oxygen atoms in the air or liquid will continue to penetrate or gold. The iron atoms in the genus are constantly separated to form loose iron oxide, and the metal surface is constantly subjected Rust. There are many forms of damage to this surface film, and the following are common in daily life:
        1. The surface of the stainless steel tube is left with powder or attachments of other metal elements, in the humid air, attached The condensed water between the object and the stainless steel connects the two into a micro-battery, triggering an electrochemical reaction, preserving The membrane is damaged, which is called electrochemical corrosion.
        2. Stainless steel pipe surface adhesion of organic juice (such as melon and vegetables, noodle soup, phlegm, etc.), in the case of water and oxygen It constitutes an organic acid, which corrodes the metal surface for a long time.
        3. The surface of the embossing tube adheres to acid, alkali and salt substances (such as alkali water and lime water splashing for wall decoration ), causing local corrosion.
        4. In polluted air (such as atmosphere containing a large amount of sulfide, carbon oxide and nitrogen oxide), when cold Condensed water, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion. The above conditions can cause stainless The destruction of the protective film on the steel surface causes corrosion.