Stainless steel anti-rust treatment method
A. When stainless steel building materials are rusted
Stainless steel building material is a metal that is not easy to rust, but it is not a metal that will never rust. Depending on the conditions of use or the environment in which it is used, it will also be contaminated and rusty. Do n’t think that stainless steel building materials are not rusty, neglect daily maintenance, and wait for pollution and when the rust is the most serious, then panic and take measures to remove it. This kind of measure is the best strategy.
Stainless steel building material is a metal that is not easy to rust, but it is not a metal that will never rust. Depending on the conditions of use or the environment in which it is used, it will also be contaminated and rusty. Do n’t think that stainless steel building materials are not rusty, neglect daily maintenance, and wait for pollution and when the rust is the most serious, then panic and take measures to remove it. This kind of measure is the best strategy.
Stainless steel products have excellent corrosion resistance and are not susceptible to rust. As mentioned earlier, they contain chromium. In the air, it combines with oxygen to form a solid surface and form a dense non-oxidized film. This non-oxidized film can prevent the oxidation of the steel surface (rust) and can protect the surface to prevent various corrosion factors. . Therefore, if this kind of film is damaged due to a certain corrosion reason, and it is placed at a place where chromium and oxygen cannot be combined, the stainless steel building materials will start to rust.
However, as long as the cause of corrosion is eliminated and chromium can be combined with oxygen, a non-oxidized film will be produced again, and its corrosion resistance function will be restored.
There are many reasons for the pollution and rust of stainless steel construction materials, but generally, they are caused by the components of suspended iron powder or harmful gases in the atmosphere, caused by adhesion, accumulation, and the adhesion of the salt contained in the sea breeze. These attachments will gradually accumulate and fix with moisture, which will destroy the non-oxidizing film on the surface of the stainless steel building material and hinder the regeneration of the film, so the stainless steel building material will start to rust. The initial state of this rust is relatively simple to remove, and the original state can be restored. Even after long-term storage, as long as proper cleaning work is done, the appearance slightly different from the original condition can be restored. It can be seen that the rust of stainless steel building materials is only the surface, not the corrosion of the material itself. This is fundamentally different from raw steel aluminum rust.
Therefore, stainless steel building materials sometimes rust, but as long as maintenance is done regularly, the original beauty of stainless steel building materials can be maintained forever.
B. Causes of rust and pollution
1. When road construction, construction engineering, or various vehicles are walking, they are attached by scattered sand, dust, iron powder, etc.
2. When it is contaminated by harmful substances such as sulfurous acid gas contained in the exhaust of cars, buses, etc.
3. Pollution by dust and harmful components in the exhaust of various industrial and mining waste incineration, building cooling and heating.
4. Pollution caused by corrosive gas in hot spring zone.
5. Attached pollution by salt contained in coastal sea breeze.
6. Contaminated by the cleaning liquid. Contaminated by handprints and dirt.
8. Contaminated by mucous membrane for surface protection.
C. Maintenance method
1. When it is rusted due to the adhesion of different metals
When the "incidental rust" caused by iron powder is not serious or the situation is not serious, the sluice can be easily removed with a sponge or cloth, plus a neutral detergent or soapy water. Then rinse with clean water, taking care not to leave lotion on it. This level of rust removal, as long as the removal work is not only easy to maintain and more effective, but also the removal cost is very cheap.
However, if this is ignored, a mixture of ferric hydroxide, ferric oxide, ferric sulfite, etc. will be formed shortly afterwards, and it will show a serious brown rust state. In this case, the commercially available swing gate stainless steel cleaning solution or 15â„… dilution of nitric acid can be used to completely remove it. However, there are also rusts that cannot be removed, and at the same time will also damage the stainless steel surface or damage the stainless steel. At this time, use sandpaper or stainless steel brush to grind and wipe, and then clean it with cleaning liquid.
2. Rust caused by adhesion of harmful components in the exhaust
In an environment with a lot of traffic on the construction site or in the streets, the stainless steel surface is easily contaminated, and sometimes it will show small spots of rust. Most of these conditions are caused by the harmful components contained in the exhaust of cars, air conditioners, or smoke from factories. At this time, when the pollution is slight, it can be completely cleaned with neutral detergent or soapy water, but it is not easy to deal with when it is serious. In this case, the same maintenance method as in item 1 above can be used for cleaning. In this environment, as much as possible, 2-3 times a year of comprehensive cleaning work, and at least one regular cleaning is absolutely necessary.
3. Rust caused by salt adhesion
The SUS 304 stainless steel will also produce red rust in a short period of time when it is hit by the sea breeze in the coastal areas. Moreover, it rusts faster than other areas, and the treatment method is the same as in 1.
Coastal areas in the use of stainless steel exterior hope to use SUS 316 as stainless steel with more corrosion resistance. As for the use of SUS 304 as a stainless steel exterior, periodic cleaning should be done 3-4 times a year as much as possible.
4. Rust caused by adhesion of cleaning chemicals
If it cannot be removed with a neutral cleaning agent, use a cleaning solution to remove it.
5. Rust caused by hand dirt or fingerprints
If it cannot be cleaned with a neutral cleaning agent, wipe it with a sponge, cloth, etc. with organic solvent (alcohol, light oil, acetone, etc.). In this method, if it can not be completely removed, then use stainless steel cleaning liquid to remove. In short, after cleaning by various cleaning methods, you must do another rinse.
6. Pollution caused by the surface protective film Wipe with a sponge or cloth moistened with water-soluble neutral detergent or alcohol. If it is still ineffective, use diluent and light oil to remove. After washing, rinse thoroughly with clean water.
D. Points for attention in maintenance
1. The causes and conditions of pollution and rust of stainless steel construction materials are completely different in each case, so the most suitable maintenance method under various conditions must be adopted.
2. When using cleaning chemicals to remove pollution and rust, please do a local “trial wipe†in advance to confirm the cleaning effect. If the test results are satisfactory, then follow this method for a comprehensive cleaning. The cleaning should not only pollute the rusty parts, but also clean the surrounding parts as much as possible. If this is not done, the gloss of the stainless steel surface will be uneven, making it difficult to see in appearance.
3. After using the cleaning solution, it must be completely cleaned with clean water. Be careful not to leave the solution on the stainless steel surface, otherwise it will cause rust. Washing the liquid medicine again can cause roughness or rash on the hands. So please wear rubber gloves before use.
4. When using cloth, sponge gourd, nylon sponge, brush hook, and brush cleaning tools, they must be cleaned in parallel along the stainless steel. If you do circular cleaning, the pollution is not easy to remove, and it will damage the gloss lines on the surface and become ugly.
The use of steel cleaning tools, such as rough texture cleaning agents or sandpaper, can remove serious pollution, but it is usually forbidden to use, because it will damage the stainless steel surface and attach iron powder to form rust.
However, as long as the cause of corrosion is eliminated and chromium can be combined with oxygen, a non-oxidized film will be produced again, and its corrosion resistance function will be restored.
There are many reasons for the pollution and rust of stainless steel construction materials, but generally, they are caused by the components of suspended iron powder or harmful gases in the atmosphere, caused by adhesion, accumulation, and the adhesion of the salt contained in the sea breeze. These attachments will gradually accumulate and fix with moisture, which will destroy the non-oxidizing film on the surface of the stainless steel building material and hinder the regeneration of the film, so the stainless steel building material will start to rust. The initial state of this rust is relatively simple to remove, and the original state can be restored. Even after long-term storage, as long as proper cleaning work is done, the appearance slightly different from the original condition can be restored. It can be seen that the rust of stainless steel building materials is only the surface, not the corrosion of the material itself. This is fundamentally different from raw steel aluminum rust.
Therefore, stainless steel building materials sometimes rust, but as long as maintenance is done regularly, the original beauty of stainless steel building materials can be maintained forever.
B. Causes of rust and pollution
1. When road construction, construction engineering, or various vehicles are walking, they are attached by scattered sand, dust, iron powder, etc.
2. When it is contaminated by harmful substances such as sulfurous acid gas contained in the exhaust of cars, buses, etc.
3. Pollution by dust and harmful components in the exhaust of various industrial and mining waste incineration, building cooling and heating.
4. Pollution caused by corrosive gas in hot spring zone.
5. Attached pollution by salt contained in coastal sea breeze.
6. Contaminated by the cleaning liquid. Contaminated by handprints and dirt.
8. Contaminated by mucous membrane for surface protection.
C. Maintenance method
1. When it is rusted due to the adhesion of different metals
When the "incidental rust" caused by iron powder is not serious or the situation is not serious, the sluice can be easily removed with a sponge or cloth, plus a neutral detergent or soapy water. Then rinse with clean water, taking care not to leave lotion on it. This level of rust removal, as long as the removal work is not only easy to maintain and more effective, but also the removal cost is very cheap.
However, if this is ignored, a mixture of ferric hydroxide, ferric oxide, ferric sulfite, etc. will be formed shortly afterwards, and it will show a serious brown rust state. In this case, the commercially available swing gate stainless steel cleaning solution or 15â„… dilution of nitric acid can be used to completely remove it. However, there are also rusts that cannot be removed, and at the same time will also damage the stainless steel surface or damage the stainless steel. At this time, use sandpaper or stainless steel brush to grind and wipe, and then clean it with cleaning liquid.
2. Rust caused by adhesion of harmful components in the exhaust
In an environment with a lot of traffic on the construction site or in the streets, the stainless steel surface is easily contaminated, and sometimes it will show small spots of rust. Most of these conditions are caused by the harmful components contained in the exhaust of cars, air conditioners, or smoke from factories. At this time, when the pollution is slight, it can be completely cleaned with neutral detergent or soapy water, but it is not easy to deal with when it is serious. In this case, the same maintenance method as in item 1 above can be used for cleaning. In this environment, as much as possible, 2-3 times a year of comprehensive cleaning work, and at least one regular cleaning is absolutely necessary.
3. Rust caused by salt adhesion
The SUS 304 stainless steel will also produce red rust in a short period of time when it is hit by the sea breeze in the coastal areas. Moreover, it rusts faster than other areas, and the treatment method is the same as in 1.
Coastal areas in the use of stainless steel exterior hope to use SUS 316 as stainless steel with more corrosion resistance. As for the use of SUS 304 as a stainless steel exterior, periodic cleaning should be done 3-4 times a year as much as possible.
4. Rust caused by adhesion of cleaning chemicals
If it cannot be removed with a neutral cleaning agent, use a cleaning solution to remove it.
5. Rust caused by hand dirt or fingerprints
If it cannot be cleaned with a neutral cleaning agent, wipe it with a sponge, cloth, etc. with organic solvent (alcohol, light oil, acetone, etc.). In this method, if it can not be completely removed, then use stainless steel cleaning liquid to remove. In short, after cleaning by various cleaning methods, you must do another rinse.
6. Pollution caused by the surface protective film Wipe with a sponge or cloth moistened with water-soluble neutral detergent or alcohol. If it is still ineffective, use diluent and light oil to remove. After washing, rinse thoroughly with clean water.
D. Points for attention in maintenance
1. The causes and conditions of pollution and rust of stainless steel construction materials are completely different in each case, so the most suitable maintenance method under various conditions must be adopted.
2. When using cleaning chemicals to remove pollution and rust, please do a local “trial wipe†in advance to confirm the cleaning effect. If the test results are satisfactory, then follow this method for a comprehensive cleaning. The cleaning should not only pollute the rusty parts, but also clean the surrounding parts as much as possible. If this is not done, the gloss of the stainless steel surface will be uneven, making it difficult to see in appearance.
3. After using the cleaning solution, it must be completely cleaned with clean water. Be careful not to leave the solution on the stainless steel surface, otherwise it will cause rust. Washing the liquid medicine again can cause roughness or rash on the hands. So please wear rubber gloves before use.
4. When using cloth, sponge gourd, nylon sponge, brush hook, and brush cleaning tools, they must be cleaned in parallel along the stainless steel. If you do circular cleaning, the pollution is not easy to remove, and it will damage the gloss lines on the surface and become ugly.
The use of steel cleaning tools, such as rough texture cleaning agents or sandpaper, can remove serious pollution, but it is usually forbidden to use, because it will damage the stainless steel surface and attach iron powder to form rust.
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