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Abstract
The corrosion behaviour of aluminium, Al-Mg-Si, and Al-Zn-Mg alloys was investigated in 0·5M NaCl solution (pH 1·3), with and without addition of triethanolamine (TEA), by means of potentiodynamic and electrochemical impedance spectroscopy (EIS) techniques. Corrosion resistance was found to follow the sequence Al-Mg-Si > Al > Al-Zn-Mg. It has been demonstrated that in all cases the addition of inhibitor induces a decrease in cathodic current without affecting the anodic polarisation behaviour, and, therefore, TEA can be treated as a cathodic type inhibitor. The results also show that the EIS technique can successfully be applied to the determination of corrosion resistance in systems where the corrosion kinetics are not simple.