Table 6.

Activation parameters of dissolution reaction of carbon steel in 1 M HCl with at different concentrations of inhibitor compounds.

Inhibitor	Conc. of inhibitors (M)	Ea (kJ mol–1)	∆H* (kJ mol–1)	∆S* (J mol–1 K–1)
Blank	0.00 × 10–4	16.09	13.17	– 207.90
DHSiMF	5  ×  10–6	40.42	36.99	− 141.04
	1 × 10–4	42.91	39.43	− 133.68
	1 × 10–3	47.91	43.68	− 120.99
	5 × 10–3	48.86	45.26	− 116.29
	1 × 10–2	50.89	47.24	− 110.25
DHSiB	5 × 10–6	37.15	33.78	− 150.29
	1 × 10–4	38.89	35.50	− 145.37
	1 × 10–3	40.91	37.47	− 139.80
	5 × 10–3	42.44	38.97	− 135.66
	1 × 10–2	45.70	42.16	− 126.04