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article
A combinatorial matrix of rare earth chloride mixtures as corrosion inhibitors of AA2024-T3: Optimisation using potentiodynamic polarisation and EIS
Abstract
A combinatorial matrix of four rare earth chlorides (cerium, lanthanum, neodymium and praseodymium) has been evaluated to investigate their corrosion inhibition of aluminium alloy AA2024-T3.Two electrochemical techniques, potentiodynamic polarisation (PP) and electrochemical impedance spectroscopy (EIS), were used to evaluate the reactivity of AA2024-T3 substrates in 0.1M NaCl with the addition of 10-3 M of the 21 rare earth chloride mixtures at time periods of 1, 3, 6, 12 and 18 hours.PP experiments showed rare earth inhibition of up to 98 % within the first hour and thereafter slow increases in corrosion efficiency were observed. EIS experiments revealed that the surface processes occurring on AA2024-T3 within the first 6-hours of immersion could be analysed using a single time constant.On this basis the polarisation resistances after 6-hour immersion were determined from both PP and EIS experiments and the datasets from the two techniques were compared.PP and EIS results were in good agreement for systems exhibiting a low polarisation resistance, whereas polarisation resistances estimated by PP were larger than those estimated using EIS for solutions with increased inhibition.The open-circuit potential (OCP) of AA2024-T3 was observed to decrease as a function of time for all solutions, which is indicative of a cathodic inhibition mechanism.However, differing trends in the OCP were observed during PP and EIS experiments. The trends observed for the combinatorial matrix have been discussed in terms of likely mechanisms of corrosion inhibition with time.Whilst 10-3 M cerium chloride with no other rare earth addition was found to be the best inhibitor for AA2024-T3 in 0.1 M NaCl, this study developed four polarisation resistance datasets for the further analysis for synergistic effects in part II of this series.