Stainless steel antirust treatment method for pedestrian gates
Stainless steel antirust treatment method for pedestrian gates
A. When stainless steel building materials rust
Stainless steel building materials are a kind of metal that is not easy to rust, but it is not a metal that will never rust. Depending on the use conditions or use environment, it will also be contaminated and rusted. Don't think that stainless steel building materials don't rust, and neglect daily maintenance. When the pollution and rust become the most serious, you should panic to take the removal measures. This kind of measure is the lowest policy.
Stainless steel products have excellent corrosion resistance and are not easy to rust. As mentioned earlier, they contain chromium. In the air, it combines with oxygen to form a firm surface and form a dense non-oxidized film. This non-oxidized film can prevent oxidation (rust) on the surface of the steel, and can protect the surface to prevent corrosion by various corrosive factors . Therefore, if this kind of film is damaged due to some corrosion reasons, and it is placed where chromium and oxygen cannot be combined, the stainless steel building materials will begin 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 contamination and rusting of stainless steel building materials, but generally, they are caused by the adhesion, accumulation, and the adhesion of the salt contained in the sea breeze by the components in the floating iron powder or harmful gases in the atmosphere. These attachments will gradually accumulate and become fixed with moisture. This will destroy the non-oxidized film on the surface of the stainless steel building material and hinder the regeneration of this film, so the stainless steel building material will begin to rust. This kind of rusty initial state can be restored to its original state by simply removing it. Even after long-term storage, as long as proper cleaning is done, the appearance is slightly different from the original condition. 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 the rust of raw steel and aluminum.
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 the road construction, construction project, or various vehicles are walking, they are attached to the scattered earth, sand, dust, iron powder, etc.
2. When it is contaminated by harmful substances such as sulfurous acid gas contained in the exhaust of automobiles, buses, etc.
3. It is polluted by dust and harmful components in exhaust from various industrial and mining waste incineration, building cooling and heating, etc.
4. Polluted by corrosive gas produced in hot spring area.
5. Contaminated by the salt in the coastal sea breeze.
6. Contaminated by cleaning chemicals. Contaminated by hand marks and dirt.
8. Contaminated by mucous membranes for surface protection.
C. Repair method
1. When rusted due to adhesion of dissimilar metals
When the "incidental rust" caused by iron powder or the situation is not too serious, the barrier can be easily removed by wiping it with a sponge or cloth, plus a neutral detergent or soapy water. Then rinse with clean water, taking care not to leave the lotion on it. For this degree of rust removal, as long as the removal work is done immediately, it is not only easy to maintain, more effective, and the removal cost is also very cheap.
But if you leave it alone, a mixture of iron hydroxide, iron oxide, and iron sulfite will soon be formed, and it will appear to be a brownish rusty state. In this case, it can be completely removed with commercially available stainless steel cleaning solutions for swing gates or dilution with 15% nitric acid. However, there is also rust that cannot be removed, and it will also damage the stainless steel surface or damage the stainless steel. At this time, use sandpaper or a stainless steel brush to rub and wipe, and then clean it with a cleaning solution.
2. Rust caused by harmful components in the attached exhaust
In an environment with a lot of traffic on the construction site or in the city and street, the surface of stainless steel is easily polluted, and sometimes it will show small spots of rust. Most of these conditions are caused by harmful components contained in exhaust from automobiles, air-conditioners, or factory exhaust. At this time, when the pollution is slight, it can be completely cleaned with neutral detergent or soapy water, but when it is serious, it is not easy to handle. In this situation, the same maintenance method as in item 1 above can be used to clean up. In this environment, as far as possible 2-3 times a year for comprehensive regular cleaning work, and at least one regular cleaning is absolutely necessary.
3. Rust caused by attached salt
SUS 304 stainless steel will also produce red rust in a short period of time when the front side is blown by the sea breeze in coastal areas.
Moreover, it rusts faster than other areas, and the treatment method is the same as in the case of 1.
When adopting stainless steel exteriors in coastal areas, it is hoped to use more corrosion-resistant SUS 316 as stainless steel.
As for the use of SUS 304 as stainless steel exterior, it should be cleaned regularly 3-4 times a year as much as possible.
4. Rust caused by adhesion of cleaning chemicals
If it cannot be cleaned 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 detergent, wipe it with a sponge, cloth, etc. moistened with an organic solvent (alcohol, benzine, acetone, etc.). If this method still cannot be completely removed, use a cleaning solution for stainless steel to remove it. In short, after cleaning with various cleaning methods, you must do another rinse with clean water.
6. Pollution caused by surface protective film
Use a sponge or cloth moistened with a water-soluble neutral detergent or alcohol to wipe. If it is still ineffective, use diluent and light oil to remove it. Rinse thoroughly with clean water after washing.
D. Points to note in maintenance
1. The reasons and conditions of pollution and rusting of stainless steel building materials are completely different in each situation, so the most suitable maintenance method should be adopted under various conditions.
2. When using cleaning chemicals to remove pollution and rust, please do a local "test wipe" in advance to confirm the cleaning effect. If the test results are satisfactory, then follow this method to do a comprehensive cleaning. And don't only clean the rusty parts, but also clean the surrounding parts as much as possible. If this is not done, the luster of the stainless steel surface will be uneven and the appearance will be ugly.
3. After using the cleaning liquid, it must be completely cleaned with clean water. Be careful not to leave the liquid on the stainless steel surface, otherwise it will cause rust. The cleaning liquid can cause roughness or rash on the hands. So please wear rubber gloves before use.
4. When using cloth, loofah, nylon sponge, brush hooks, and brush cleaning appliances, they must be cleaned in parallel along the stainless steel. If you do a circular cleaning, the pollution is not easy to remove, and it will damage the glossy lines on the surface, making it ugly.
Steel cleaning tools, such as rough-line cleaning agents, or the use of sandpaper, can remove serious pollution, but they are absolutely forbidden to use because they can damage the surface of stainless steel and attach iron powder to cause rust.
