One way to remove iron rust is by electrochemical process. The iron or metal that will be rusted is given a negative charge and the other electrode means that it is positively charged, so the rust will be released from the metal because negative ions will come out of the metal and go to the positive electrode. If the process is continued, the iron may become shiny, not because it is coated in therapy because the surface is partly faded. This is because the iron functions as a negative electrode, where the ions on the surface of the iron will decay and dissolve into the chemical solution. To give an idea of this process, see the following video: