1, after taking a length of about 20 cm, about 2 cm car scraper with glove thick aluminum wires, the upper hand, the lower end is immersed in a test tube containing a hot solution of sodium hydroxide (concentration of 6 mol / L), a large number of bubbles to the reaction removed, to remove the oxide film on the aluminum surface.
2, rinse with water and then immersed in these end 0.1 mol / L of mercuric nitrate solution 1 min ~ 2 min, car ice scraper glove rinsed with water immediately after removal and dry surface water with filter paper.
3, this was allowed to stand on glass aluminum observed phenomena. You can see the aluminum surface quickly produce a white fluffy material (alumina) and growth over a period of time was hairy.
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