Synergistic effect of CeCl3 and benzotriazole on corrosion resistance of naturally aged and artificially aged AA2024 aluminium alloy
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The corrosion behaviours of naturally aged and artificially aged AA2024 aluminium alloys in 0.5 mol/dm3 NaCl solution in the presence of environmentally friendly corrosion inhibitors of 10 mmol/dm3 CeCl3, 10 mmol/dm3 BTA and the inhibitor mixture (5 mmol/dm3 CeCl3 + 5 mmol/dm3 BTA) were analyzed. The goal of this work was to determine the level of the synergistic effect of the inhibitor mixture and to explain the nature of this effect. Corrosion properties of the inhibitor layer were studied using the electrochemical impedance spectroscopy (EIS), while the resistance to pit formation and pit growth was studied by applying potentiodynamic polarisation tests. The results of scanning electron microscopy (SEM/EDS) showed that the size of pits formed in naturally aged aluminium alloy was smaller than that formed in artificially aged alloy. The synergistic effect of the inhibitor mixture on corrosion properties of naturally aged alloy was observed throughout 96 h, and in later phases of test...ing of artificially aged alloy. The synergistic effect of the inhibitor mixture was not noticed on pit formation and pit growth.
Keywords:aluminium alloy / Aluminum alloys / Aluminum corrosion / benzotriazole / Benzotriazoles / cerium / Cerium compounds / Corrosion behaviour / corrosion inhibitor / Corrosion inhibitors / Corrosion property / Corrosion resistance / Corrosive effects / Electrochemical corrosion / Electrochemical impedance spectroscopy / Mixtures / NaCl solution / Naturally aged / Pit formation / Pit growth / pitting corrosion / Scanning electron microscopy / Sodium alloys / Sodium chloride / Synergistic effect
Source:Transactions of Nonferrous Metals Society of China (English Edition), 2020, 30, 6, 1478-1490
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