Anticorrosive Effect of Halogenated Aniline Enaminoesters on Carbon Steel in HCl

Table 5

Results of weight loss assays of carbon steel AIS 1020 including corrosion rates (/mg cm^-2 h^-1) in the absence and presence of inhibitors, and corrosion inhibition efficiencies () at 30°C with variation in immersion time.

Time (h)	Blank (mg cm^-2 h^-1)	Inhibitor
		F-EN		Cl–EN		Br-EN		H-EN
		3	1.359 ± 0.003	0.195 ± 0.014	85.6	0.219 ± 0.001	83.8	0.253 ± 0.001	81.4	0.271 ± 0.001	80.0
6	1.225 ± 0.006	0.140 ± 0.001	88.5	0.177 ± 0.001	85.5	0.176 ± 0.002	86.6	0.202 ± 0.001	85.5
24	1.116 ± 0.019	0.061 ± 0.001	94.6	0.055 ± 0.001	95.0	0.138 ± 0.004	87.7	0.105 ± 0.001	90.6
48	1.005 ± 0.014	0.015 ± 0.001	98.5	0.022 ± 0.001	97.8	0.021 ± 0.002	97.9	0.077 ± 0.001	92.4