2.2.1. Gravimetric measurements
Methods
The tests were carried out in a glass vessel containing 250 mL of 0.5 M HCl with and without addition of different concen- trations of inhibitor at room temperature (25°C). After immersion times (24 h), the specimens were withdrawn, rinsed with doubly distilled water, washed with acetone, dried and weighted.
2.2.2. Electrochemical measurements
Two electrochemical techniques, namely DC-Tafel slope and AC-electrochemical impedance spectroscopy (EIS), were used to study the corrosion behaviour. All experiments were per- formed in one-compartment cell with three electrodes con- nected to voltalab 10 (Tacussel–Radiometer PGZ 100) system controlled by the Tacussel Volta master 4 corrosion analysis software model.
Polarization curves were obtained by changing the elec- trode potential automatically from