Electrochemical parameters extracted from the potentiodynamic polarization curves for corrosion of aluminum alloy in 0.1 M HCl in the presence and absence of Schiff bases at 298 K (results from Fig. 4).

Code	Conc. (ppm)	−Ecorr (mV)	I corr (mA)	β a (V per decade)	β c (V per decade)	θ	η%
Blank	—	−678.0	18.59	1.200	1.8	—	—
UA	50	−680.0	14.48	1.737	8.32	0.4010	40.1
	100	−700.5	8.980	1.467	1.335	0.5169	51.7
UB	50	−759.9	5.723	0.653	1.303	0.6921	69.2
	100	−762.0	2.86	0.950	0.816	0.8461	84.6
UC	50	−768.1	1.730	0.842	1.223	0.9060	90.6
	100	−690.6	0.751	0.229	0.397	0.9593	95.9