ANODIZATION METHOD FOR CORROSION PROTECTION OF ALUMINIUM ALLOY ELEMENTS USED IN AN AIRCRAFT STRUCTURE

An anodization method for corrosion protection of an aluminium or aluminium alloy element used in an aircraft structure, comprising the following steps: a) subjecting the element to a degreasing stepby means of an alkaline bath for removing contaminating elements [100]; b) subjecting the element to a subsequent first washing in water [110]; c) subjecting the element to an acid pickling step by dipping the element in an acid solution and then extracting the element from the acid solution and subjecting the element to a subsequent washing in water; d)subjecting the washed element to a subsequent electrochemical treatment step in a tank by dipping the element in a solution of tartaric acid (C4H6O6) and sulphuric acid (H2SO4) [140]; e) subjecting the element to a subsequent washing in water;f) dipping the element in a bath in which a solution of chromium, with an oxidation number of +3, and zirconium ions and fluorides is present, in order to carry out a first post-anodization sealing step [170]; g) extracting th