How to understand the principle of aluminum polishing
[China Aluminum Network] Taking aluminum parts as an example, aluminum parts will rapidly form oxide films in the air. Abrasive (polishing paste) during polishing will first throw off the oxide film on the protruding part, but the concave part will not be thrown, then the matrix will oxidize quickly after being exposed, and then it will be thrown away, and it will be repeated until it is thrown into Bright so far.
Polishing is not actually the cutting of aluminum itself, but just the process of continuously throwing off the oxide film, but due to repeated polishing, the throwing speed of the later aluminum material itself is still very fast.
Some researchers also believe that polishing is the result of metal moving from the convex to the concave, thus forming an amorphous layer. It was also observed from an electron microscope that the outer surface of the mechanically polished surface was crushed into an irregular, very fine crystalline state. Which statement is more correct is still to be further discussed.
Cobalt, elemental symbol Co, silvery white ferromagnetic metal, slightly silvery white on surface, 4th period in Periodic Table, Group VIII, atomic number 27, atomic weight 58.9332, hexagonal close packed, common valence of +2 , +3. Cobalt is a shiny steel gray metal, relatively hard and brittle, ferromagnetic, magnetic disappeared when heated to 1150 ℃. Cobalt has valences of +2 and +3. It does not interact with water at room temperature and is stable in humid air. Cooled to CoO when heated in air to above 300 ° C, and burned into Co3O4 when whitened. Hydrogen reduction method made of fine metallic cobalt powder in the air can spontaneous combustion of cobalt oxide. Cobalt is an important raw material for the production of heat-resistant alloys, hard alloys, anti-corrosion alloys, magnetic alloys and various cobalt salts.
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