① Regularly check the surface of the electric door, clean and scrub from time to time, remove attachments, and eliminate external factors that cause rust.

② For those areas where there is no industrial pollution, it is necessary to inform relevant personnel when installing stainless steel products and select the appropriate types of stainless steel materials, such as 201 and 202 materials.

③ 304 stainless steel should be used in coastal areas, which can resist seawater corrosion.

What should I do if the stainless steel has rust spots?

a) Chemical method:

Use pickling paste or spray to assist the re-passivation of the rusted parts to form a chromium oxide film to restore corrosion resistance. After pickling, in order to remove all contaminants and acid residues, it is very important to rinse with clean water. After all treatments, re-polishing with polishing equipment and sealing with polishing wax. For those with slight rust spots, you can also use a 1:1 gasoline and engine oil mixture to wipe off the rust spots with a clean cloth.

b) Mechanical method:

Sandblasting, blast cleaning with glass or ceramic particles, annihilation, brushing and polishing. It is possible to use mechanical methods to wipe off the pollution caused by the previously removed materials, polishing materials or oblique materials. All kinds of pollution, especially foreign iron particles, can become a source of corrosion, especially in humid environments. Therefore, mechanical cleaning of the surface is better and should be properly cleaned under dry conditions. The use of mechanical methods can only clean the surface, and cannot change the corrosion resistance of the material itself. Therefore, it is recommended to re-polishing with polishing equipment after mechanical cleaning and sealing with polishing wax.