Aluminum wire was inserted into copper sulfate solution without any phenomenon. What is the reason for this?
The aluminum wire has antirust oil (grease)The surface of aluminum wire is coated with transparent paint filmA thick oxide film is formed on the surface of the aluminum wireA dense oxide film is formed on the surface of the aluminum wire
Under normal circumstances, the aluminum wire is inserted into the copper sulfate solution, and the surface of the aluminum wire is plated with a layer of copper. No phenomenon occurred,
You can thoroughly wipe the aluminum wire surface with 200 or more sandpaper to remove these protective substances. Then the aluminum wire is inserted into the solution of copper sulfate, and the normal reaction can occur.
