mechanical polishing

1、 Mechanical polishing on the surface of aluminum products:

Mechanical polishing process is: rough grinding, fine grinding, polishing, polishing, sandblasting, brushing or rolling, etc., according to the roughness of the surface to take different procedures.

2、 Chemical oil removal: formula and process conditions of chemical oil removal liquid:

1. Formula: sodium hydroxide 30-50g / L, industrial detergent 0.5-1ml / L, water 70-125g.
2. Process conditions: temperature: 50-60 ℃, time: 1-2min
3. Rinse with water after degreasing.
4. Chemical removal of oxide film: acid pickling is carried out to neutralize the residual alkali solution on the surface of the product, and the natural oxide film is removed to expose the aluminum and aluminum alloy matrix of the product. For the production of aluminum alloy containing silicon, the mixed solution must be used for acid pickling to remove the dark silicon floating ash on the surface.

Formula of pickling solution:

Concentrated nitrate solution 200 ~ 270ml / L

Temperature: room temperature time: 1-3min

The formula of pickling solution for removing oxide film and silica fume on the surface of aluminum alloy products containing silicon is as follows

3 volume of concentrated nitric acid and 1 volume of concentrated hydrofluoric acid.

Temperature: room temperature time: 5-15min

After chemical pickling, aluminum and aluminum alloy parts must be cleaned immediately with flowing warm water and cold water to remove residual acid, and then immersed in water for chemical polishing.