公开(公告)号：US20200024766A1

公开(公告)日：2020-01-23

申请号：US16192038

申请日：2018-11-15

申请人： LEONARDO S.P.A.

发明人： Bruno ADDIVINOLA ,  Stefano PASTORE ,  Augusto ALBOLINO ,  Antonio CILIBERTO ,  Lucia CUTILLO ,  Giuseppe Stefano GALLO

IPC分类号： C25D11/24 ,  C25D11/02 ,  C25D11/16 ,  C25D11/10

摘要： 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 step by means of an alkaline bath for removing contaminating elements; b) subjecting the element to a subsequent first washing in water; 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; 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); 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; g) extracting the element from the bath of step f) and subjecting it to a subsequent final washing and a subsequent dipping in a tank of boiling water (second sealing step), and then drying the element.