Table 4.

Corrosion parameters obtained from weight loss measurements of carbon steel after 24 h immersions in 1 M HCl with and without addition of different concentrations of inhibitor compounds.

T (K)	Inhibitor conc. (M)	DHSiMF				DHSiB
		ΔW (mg)	CR, (mg cm-2 h–1)	θ	ηw (%)	ΔW (mg)	CR, (mg cm–2 h–1)	θ	ηw(%)
303	Blank	93	0.4020	–	–	93	0.4020	–	–
	5 × 10–6	18	0.0778	0.806	80.65	22	0.0951	0.763	76.34
	1 × 10–4	16	0.0692	0.828	82.80	20	0.0865	0.785	78.48
	1 × 10–3	13	0.0562	0.860	86.02	18	0.0778	0.806	80.65
	5 × 10–3	12	0.0519	0.871	87.10	16	0.0692	0.828	82.79
	1 × 10–2	11	0.0475	0.882	88.17	14	0.0605	0.850	84.95
313	Blank	121	0.5230	–	–	121	0.5230	–	–
	5 × 10–6	34	0.1470	0.719	71.90	38	0.1643	0.686	68.59
	1 × 10–4	32	0.1383	0.736	73.55	35	0.1513	0.711	71.07
	1 × 10–3	28	0.1210	0.769	76.86	30	0.1297	0.752	75.20
	5 × 10–3	27	0.1167	0.777	77.69	28	0.1210	0.769	76.86
	1× 10–2	26	0.1124	0.785	78.51	25	0.1081	0.793	79.33
323	Blank	154	0.6657	–	–	154	0.6657	–	–
	5 × 10–6	57	0.2464	0.630	62.99	65	0.2810	0.578	57.79
	1 × 10–4	55	0.2377	0.643	64.29	60	0.2594	0.610	61.03
	1 × 10–3	51	0.2205	0.669	66.88	56	0.2421	0.636	63.63
	5 × 10–3	49	0.2118	0.682	68.18	52	0.2248	0.662	66.23
	1 × 10–2	48	0.2075	0.688	68.83	50	0.2161	0.675	67.54
333	Blank	162	0.7003	–	–	162	0.7003	–	–
	5 × 10–6	75	0.3242	0.537	53.70	80	0.3458	0.506	50.62
	1 × 10–4	73	0.3155	0.549	54.94	78	0.3372	0.518	51.85
	1 × 10–3	69	0.2983	0.574	57.41	74	0.3199	0.543	54.32
	5 × 10–3	68	0.2939	0.580	58.02	70	0.3026	0.568	56.79
	1 × 10–2	67	0.2896	0.586	58.64	68	0.2939	0.580	58.03