Table 1. Corrosion Parameters of Steel in 1.0 M HCl with Different Concentrations of Inhibitors at Different Temperatures.

		DPTU		PPTU
temperature (°C)	concentration (M)	i	H (%)	i	H (%)
30		0.90		0.90
	2.0 × 10–4	0.06	93.1	0.03	97.2
	1.0 × 10–4	0.08	91.5	0.03	96.6
	5.0 × 10–5	0.09	89.9	0.05	94.1
	1.0 × 10–5	0.14	84.9	0.07	92.6
40		1.01		1.01
	2.0 × 10–4	0.16	84.0	0.09	90.7
	1.0 × 10–4	0.20	80.3	0.10	89.8
	5.0 × 10–5	0.21	78.8	0.12	87.9
	1.0 × 10–5	0.24	76.1	0.15	84.8
50		4.10		4.10
	2.0 × 10–4	1.40	65.8	1.23	70.0
	1.0 × 10–4	1.54	62.5	1.28	68.9
	5.0 × 10–5	1.60	61.0	1.35	67.1
	1.0 × 10–5	1.90	53.7	1.42	65.4
60		7.35		7.35
	2.0 × 10–4	3.98	45.8	3.21	56.3
	1.0 × 10–4	4.25	42.2	3.27	55.6
	5.0 × 10–5	4.44	39.6	3.59	51.2
	1.0 × 10–5	5.03	31.6	3.62	50.7