abstract
The paper focuses on the two-step anodizing of 1050 aluminium alloy at constant current under selfordered
regime. The evolution of the structural parameters of the anodic aluminium oxide and the correlation
between self-ordering growth regime, aluminium surface nanotexturing and anodizing operating
conditions are analyzed in oxalic acid bath, as well as the effect of intermetallic compounds from
the aluminium matrix. The paper shows that a proper choice of the operating conditions allows the tuning
of self-ordering regime, control of local catastrophic phenomena and achievement of a more uniform
growth. Therefore, alumina membranes are obtained with a defined structure and a degree of order that
is comparable to those obtained with anodizing at constant voltage