Anodic protection (AP) is a potential-control electrochemical technique suitable for preventing corrosion of a metal in aggressive environments, such as sulfuric acid (H₂SO₄. In this technique, the metal to be protected must exhibit passivity at relatively low current density so that the passive current density (i_p) is at least one order of magnitude lower than the corrosion current density (i_corr) care must be exercise in selecting a material that shows a wide enough passive potential range. Thus, the protective potential is E_pa>E_x<E_p.