The high throughput assessment of aluminium alloy corrosion using fluorometric methods. Part II - A combinatorial study of corrosion inhibitors and synergistic combinations

The discovery of new corrosion inhibition systems remains dependent on experimental methods for screening and characterization. This paper examines a new method to rapidly assess aluminium alloy corrosion and inhibitor performance through quantification of aluminium ion concentration using fluorometric probes. The fluorometric probes, lumogallion and morin, were used in conjunction with a plate reader to rapidly assess fourteen corrosion inhibitors and their combinations for AA2024-T3. AA2024-T3 wire electrodes were exposed to 3.4 mM total inhibitor concentration in 0.6 M NaCl adjusted to pH 2, 4, 7, 10, and 12 for 1-7 days. Corrosion inhibition provided by mixtures of lanthanum and molybdate, cerium and molybdate, and metavanadate with phosphate was found to be superior to the equivalent concentration of sodium chromate.