Method for treating packaging for radioactive material against corrosion

A method for treating at least one surface of packaging for transporting, warehousing and/or storing radioactive material against corrosion by means of an electrolytic device comprising an anode, a cathode and an electrolytic solution, said at least one surface of the packaging being a surface intended to accommodate at least one seal of the packaging and the electrolytic solution comprising at least one metal M in cationic form, this method comprising the following successive steps (a) to (d):

• (a) bringing at least one applicator impregnated with the electrolytic solution into contact with the surface of the packaging, the packaging forming the cathode and the applicator forming the anode, the anode and the cathode being connected to a power supply,
• (b) applying an electrical voltage delivered by the power supply between the cathode and the anode at a value U between 5 V and 30 V and, advantageously, between 8 V and 15 V,
• (c) keeping the electrical voltage at this value U so as to reduce the metal M in cationic form, whereby a layer of the metal M, having a thickness advantageously between 20 μm and 100 μm and, preferably, between 40 um and 70 μm, is formed on the surface of the packaging in contact with the applicator and
• (d) removing the applicator from the coated surface of the packaging,
• the electrolytic solution comprising a nickel sulfamate.