Stainless steel material introduction:
Stainless steel material is also will be rusty. Stainless steel material is a general term for a material. There are usually three types of materials for stainless steel screws: 201 material, 304 material, 316 material and anti-corrosion performance is 316>304>201. The price is also different. The price of 316 stainless steel is the highest. It is usually used in places with acidic environment and seawater corrosion. Seawater contains acidic physique, and the requirements for materials are particularly high.
Stainless steel rust principle:
1. The surface of stainless steel has accumulated dust containing other metal elements or attachments of foreign metal particles. In humid air, the condensed water between the attachments and stainless steel connects the two to form a micro battery, which initiates an electrochemical reaction. The protective film is damaged, which is called electrochemical corrosion.
2. The surface of stainless steel adheres to the organic juice (such as melon, vegetable, noodle soup, sputum, etc.), which forms organic acid in the presence of water and oxygen, and the organic acid will corrode the metal surface for a long time.
3. The surface of stainless steel adheres to containing acids, alkalis, and salt substances (such as alkaline water and lime water splashing on the decoration walls), causing local corrosion.
4. In polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, and nitrogen oxide), it will form sulfuric acid, nitric acid, and acetic acid liquid spots when encountering condensed water, causing chemical corrosion.
Methods:
1. The surface of decorative stainless steel must be cleaned and scrubbed frequently to remove attachments and eliminate external factors that cause modification.
2. The chemical composition of some stainless steel pipes on the market cannot meet the corresponding national standards and cannot meet the material requirements of SUS304. Therefore, rust will also be caused, which requires users to choose products from reputable manufacturers carefully.
3. If use in seaside areas, we should choose 316 stainless steel material which can resist seawater corrosion.
Selection principle:
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Environmental Rating Level 1 SUS201, SUS304D |
Environmental Rating Level 2 A SUS201, SUS304D |
Environmental Rating Level 2 B SUS304 |
Environmental Rating Level 3 A SUS304 |
| Indoor dry environment, permanentnon-corrosive staticwater immersion environment
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Indoor humid environment, open-air environment in non-severe cold and non-cold areas, environment in non-severe cold and non-cold areas in direct contact with non-erosive water or soil; cold and severe cold areas below the freezing line and non-erosive water or soil directly The environment of contact.
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Dry and wet alternate environments,environments with frequent changes in water levels, open-air environments in severe cold and cold areas, and environments where non-erosive water or soil is directly contacted above the freezing line in severe cold and cold areas.
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In severe cold and cold regions, the water level is frozen in winter, the environment is affected by deicing salt, the sea breeze environment.
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Environmental Rating Level 3 B SUS316 |
Environmental Rating Level 4 SUS316 |
Environmental Rating Level 5 SUS316 |
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Saline soil environment, environment affected by deicing salt, coastal environment. |
Sea water environment.
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An environment affected by man-made or natural corrosive substances.
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Post time: Dec-14-2019
