There is aluminium on copper, take off caustic soda, can copper why become red?
The reaction is aluminum and copper sulfate, copper sulfate and aluminum is produced, the first group of atoms and other trim, trim, trim can be observed by law, so the equation is: 2Al+3CuSO4 Al2 (SO4) 3+3Cu. one so the answer is: remove the oxide film on the surface of aluminum; one is 2Al+3CuSO4 Al2 (SO4) 3+3Cu.
Aluminum and alumina film easily reacts with oxygen to form dense, the sandpaper polished aluminum wire surface in order to remove the oxide film on the surface of aluminum
