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Causes of rusting of thick stainless steel plates

Causes of rusting of thick stainless steel plates

The stainless steel thick plate has a smooth surface, high plasticity, toughness and mechanical strength, and is resistant to corrosion by acids, alkaline gases, solutions and other media. It is an alloy steel that is not easy to rust, but it is not rust-free. Stainless steel thick plates can resist corrosion by weak media such as atmosphere, steam and water, while acid-resistant steel plates refer to steel plates that can resist corrosion by chemical corrosive media such as acids, alkalis, and salts. Therefore, thick stainless steel plates will also rust.

When brown rust spots appear on the surface of the stainless steel thick plate, the stainless steel thick plate will also rust under certain conditions. Below we will explain in detail the reasons for the rust of stainless steel plates.

1. Chemical corrosion: In the air with high levels of pollutants such as sulfides, carbon oxides and nitrogen oxides, once condensed water is generated on the surface of the stainless steel plate, inorganic acids such as sulfuric acid, nitric acid and acetic acid will be formed. Pollutants. If it is not cleaned for a long time, it will cause chemical corrosion of stainless steel.

2. Organic acid corrosion: If organic juice adheres to the surface of stainless steel thick plates, such as melons, vegetables, noodle soup, sweat, etc., organic acids will be formed in the presence of water and oxygen. The corrosive ability of organic acids is much stronger than that of inorganic acids. After a long period of corrosion, organic acids will destroy the protective film on the surface of the stainless steel plate, causing the internal metal to lose protection and rust.

3. Electrochemical corrosion: If there is a large amount of dust from attachments containing other metal elements or foreign particles on the surface of the stainless steel thick plate, condensed water will be formed between the attachment and the stainless steel in the humid air. The three converge into a miniature battery, which initiates an electrochemical reaction. The electrochemical reaction will lead to the destruction of the protective film, and the cause of this corrosion is called electrochemical corrosion.

4. Local corrosion: If the surface of stainless steel adheres to substances containing acid, alkali and salt, such as alkaline water or lime water splashed from the decoration of the wall to the surface of the stainless steel plate, the protective film will be damaged after a period of time. destroy.