Activation parameters for steel dissolution in 1 M HCl in the absence and the presence of inhibitors.

Inhibitors	R 2	E a (kJ mol−1)	ΔH* (kJ mol−1)	ΔS* (J mol−1 K−1)
Blank	0.991	30.60	28.00	−123.28
PTA	0.998	71.89	69.29	−10.42