▎ 摘　　要

NOVELTY - Preparation method of high pressure and high specific volume corrosion foil involves (i) soaking aluminum foil in a solution containing phosphoric acid for degreasing treatment, (ii) soaking the pre-treated aluminum foil in a mixed solution containing hydrochloric acid, aluminum ion, niacin and sulfuric acid, and applying a direct current to corrode the pores, (iii) washing the aluminum foil after the first-level pore corrosion with pure water, soaking in a mixed solution containing hydrochloric acid, graphene oxide, aluminum ion and corrosion inhibitor, and performing electrochemically expanding corrosion, (iv) sintering the aluminum foil after the secondary hole expansion corrosion, (v) soaking the sintered aluminum foil in a mixed solution containing hydrochloric acid, aluminum ion and corrosion inhibitor, and performing electrochemically expanding corrosion, and (vi) soaking the aluminum foil after the three-stage corrosion in a nitric acid solution. USE - The method is useful for preparation of high pressure and high specific volume corrosion foil. ADVANTAGE - The method provides a higher specific volume and excellent bending strength to foil by adding graphene oxide through multi-stage pore expansion corrosion. DETAILED DESCRIPTION - Preparation method of high pressure and high specific volume corrosion foil involves (i) soaking aluminum foil in a solution containing 1-5 %mass phosphoric acid for degreasing treatment, (ii) soaking the pre-treated aluminum foil in a mixed solution containing hydrochloric acid, aluminum ion, niacin and sulfuric acid, and applying a direct current with a current density of 30-50 A/dm2 to corrode the pores for 60-90 seconds, (iii) washing the aluminum foil after the first-level pore corrosion with pure water, soaking in a mixed solution containing hydrochloric acid, graphene oxide, aluminum ion and corrosion inhibitor, and performing electrochemically expanding corrosion at 60-90 degrees C for 120-180 seconds, (iv) sintering the aluminum foil after the secondary hole expansion corrosion, (v) soaking the sintered aluminum foil in a mixed solution containing hydrochloric acid, aluminum ion and corrosion inhibitor, and performing electrochemically expanding corrosion for 180-300 seconds under current density of 4-6 A/dm2, and (vi) soaking the aluminum foil after the three-stage corrosion in a nitric acid solution with a temperature of 40-60 degrees C and a content of 0.3-3 %mass for 120-180 seconds.