u200bDoes the 304 stainless steel plate discolor for a long time?

Why does stainless steel also rust? When brown rust spots (spots) appear on the surface of stainless steel pipes, people are amazed: 'Stainless steel does not rust, and if it rusts, it is not stainless steel. Maybe there is a problem with the steel.' . In fact, this is a one-sided misconception about the lack of understanding of stainless steel. Stainless steel will also rust under certain conditions. 304 stainless steel plate has the ability to resist atmospheric oxidation---that is, rust resistance, and also has the ability to corrode in the medium containing acid, alkali and salt---that is, corrosion resistance. But the size of its anti-corrosion ability is changed with the chemical composition of its steel itself, the state of mutual addition, the conditions of use and the type of environmental media. Such as 304 steel pipe, in a dry and clean atmosphere, it has excellent anti-corrosion ability, but if it is moved to the seaside area, it will rust quickly in the sea fog containing a lot of salt;

The 316 steel pipe performed well. Therefore, it is not any kind of stainless steel that can resist corrosion and rust in any environment. Stainless steel is a very thin, firm, fine and stable chromium-rich oxide film (protective film) formed on its surface to prevent the continuous infiltration and oxidation of oxygen atoms, and obtain the ability to resist rust. Once the film is damaged continuously for some reason, oxygen atoms in the air or liquid will continuously infiltrate or iron atoms in the metal will continue to separate out, forming loose iron oxide, and the metal surface will be continuously corroded. There are many forms of damage to this surface film.

The most common ones in daily life are as follows: 1. Dust containing other metal elements or attachments of dissimilar metal particles accumulate on the surface of stainless steel. In the humid air, the condensed water between the attachment and the stainless steel connects the two into a micro-battery, which triggers an electrochemical reaction and damages the protective film, which is called electrochemical corrosion. 2. Organic juices (such as vegetables, noodle soup, sputum, etc.) adhere to the surface of stainless steel. In the presence of water and oxygen, organic acids are formed, and organic acids will corrode the metal surface for a long time. 3. The surface of stainless steel adheres to substances containing acids, alkalis and salts (such as alkaline water and lime water splashing from decoration walls), causing local corrosion. 4. In polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, nitrogen oxide), when encountering condensed water, it will form liquid spots of sulfuric acid, nitric acid and acetic acid, causing chemical corrosion.

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