Table 3 Activation parameters values for mild steel in 1 M HCl in the absence and presence of different concentrations of the studied 6a and 6b at different temperatures.

Inhibitor	Conc. of inhibitor (ppm)	Ea (kJ mol⁻¹)	∆H* (kJ mol⁻¹)	∆S* (kJ mol⁻¹ K⁻¹)
Blank	0.00	− 53.63	− 51.05	− 11.42
6a	50	− 96.51	− 93.94	− 119.37
	100	− 104.49	− 101.91	− 145.74
	200	− 122.64	− 120.06	− 201.12
	500	− 142.35	− 139.76	− 260.71
6b	50	− 91.60	− 89.02	− 106.68
	100	− 99.61	− 97.02	− 131.00
	200	− 106.83	− 104.24	− 152.06
	500	− 116.04	− 113.63	− 179.75

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