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Corrosion causes of 316L stainless steel
- Categories:Industry News
- Author:HAOSTEEL
- Origin:Technical knowledge
- Time of issue:2023-08-02 12:03
- Views:
(Summary description)
Corrosion causes of 316L stainless steel
(Summary description)
- Categories:Industry News
- Author:HAOSTEEL
- Origin:Technical knowledge
- Time of issue:2023-08-02 12:03
- Views:
Information
Corrosion causes of 316L stainless steel
The surface of 316L stainless steel has an extremely thin and solid stable chromium-rich oxide film (protective film), which can prevent oxygen atoms from penetrating and oxidizing the matrix, which is also the origin of its corrosion resistance. However, for some reason, this film will be continuously destroyed, and the oxygen atoms in the air or liquid will continue to separate, resulting in loose iron oxide, and the stainless steel surface will rust.
1, stainless steel surface attached with other metal elements of dust or metal particles and other foreign bodies, encountered moisture, these foreign bodies and 316L stainless steel condensed water connected into a micro battery, produce an electrochemical reaction, damage the protective film of stainless steel surface, this is the electrochemical corrosion of stainless steel.
2, stainless steel surface there is organic juice (such as soup, juice, etc.), when there is water oxygen scene, organic acids will be formed, over a long time these organic acids will corrode stainless steel surface.
3, stainless steel surface there are some acid, alkali, salt liquid substances (such as lime water, alkali water, etc.), will lead to local corrosion of stainless steel surface.
4, in the polluted air (such as a large number of sulfide, carbon oxide, nitrogen oxide atmosphere), in the stainless steel surface condensate, easy to generate acetic acid liquid point, sulfuric acid, nitric acid, which is the chemical corrosion of stainless steel.
The above scenarios will lead to corrosion of the 316L stainless steel surface.
Cause of rust
Stainless steel will rust under certain conditions, although 316L stainless steel has natural resistance to atmospheric oxidation, that is, no rust characteristics, but also in the environment containing acid, alkali, salt and other corrosion resistance, that is, corrosion resistance. However, the corrosion resistance of 316L stainless steel varies with its own chemical composition, mutual state, use conditions and the type of environmental media.
Such as in a dry and clean atmosphere, the corrosion resistance of 304 stainless steel is absolutely great, but once in the coastal area, affected by the sea fog of concentrated salt, it is easy to rust, but 316 stainless steel is better. Therefore, stainless steel is not resistant to corrosion and rust in any environment.
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