The corrosion behavior of aluminum in 1 M potassium hydroxide (KOH) solution with and without calcium tartrate was investigated by means of weight loss measurement, open-circuit potential measurement, potentiodynamic polarization, and electrochemical impedance spectroscopy. Experimental results showed that the corrosion of aluminum was inhibited by the addition of calcium tartrate. At high calcium tartrate concentrations, the anodic and cathodic processes were greatly inhibited. At its low concentration, the effect of the inhibitor on the former was much stronger than that on the latter. This might have been caused by the selective adsorption of the inhibitor on anodic active sites.

Subject
Electrochemical impedance spectroscopy, Water, Additives, Aluminum, Alkaline solutions, Calcium, Anodic reactions, Ion concentrations, Inhibition efficiency, Weight loss, Cathodic inhibitors, Electrodes, Anodic inhibitors
Keywords:
alkaline solution, aluminum, calcium tartrate, electrochemical impedance spectroscopy, inhibition, potentiodynamic polarization
NACE International
2001
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