IFHANAL-3 Inhibited Chromate-Free Conversion Coatings on V95T2 Aluminum Alloy

摘要

Alloys in the Al-Cu-Mg-Zn system are known to be characterized with high corrosion resistance in both atmospheric and aqueous media. It was earlier demonstrated that the alkaline chromate-free converting composite IFHANAL-3 enabled one to produce coatings with protective properties not inferior to those of conventional chromate coatings on a number of aluminum alloys, including that of grade V95 with different thermal treatment. The present work was devoted to studies of the effect of different complexing agents on the oxidation process and protective properties of coatings on V95T2 alloy. The studied modifying dopants decrease the concentrations of different oxides in the composition of conversion coatings, thus facilitating the adsorption of corrosion inhibitors and improvement of their protective properties. The decrease of the oxidation temperature in the solution of IFHANAL-3 modified with inhibitors of the azol type does not ly affect protective properties of the formed coatings.