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1. Chemical methods
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 properly with clean water. After all treatments, use polishing equipment to polish again, and then seal with polishing wax. For those with slight rust spots, you can use a 1:1 gasoline and engine oil mixture to wipe off the rust spots with a clean cloth.
2. Mechanical method
Sandblasting, blasting with glass or ceramic particles, annihilation, brushing and polishing. It is possible to use mechanical methods to wipe off the contamination caused by previously removed materials, polishing materials or oblivious materials. All kinds of pollution, especially foreign iron particles, can become a source of corrosion, especially in humid environments. Therefore, mechanically cleaned surfaces 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.