Inhibition Behaviour of Some Isonicotinic Acid Hydrazides on the Corrosion of Mild Steel in Hydrochloric Acid Solution

Table 1

CR and IE (%) obtained from mass loss measurements of MS in 0.5 M HCl solution containing various concentrations of INIMH and INPMH at different temperatures.

𝑇 (°C)	Concentration (ppm)	INIMH		INPMH
		CR (mg cm^−2 h^−1)	IE (%)	CR (mg cm^−2 h^−1)	IE (%)
30	Blank	0.7200	—	0.7200	—
	200	0.2296	68.16	0.2367	67.19
	300	0.1875	74.00	0.1947	73.01
	400	0.1288	82.14	0.1359	81.15
	500	0.0998	86.16	0.1069	85.17
40	Blank	0.9490	—	0.9490	—
	200	0.3202	66.24	0.3296	65.25
	300	0.2814	70.33	0.2909	69.33
	400	0.1895	80.02	0.1986	79.05
	500	0.1573	83.41	0.1672	82.37
50	Blank	1.1520	—	1.1520	—
	200	0.4091	64.49	0.4214	63.41
	300	0.3562	69.07	0.3669	68.15
	400	0.2474	78.52	0.2591	77.50
	500	0.2001	82.62	0.2107	81.70
60	Blank	1.4350	—	1.4350	—
	200	0.5376	62.54	0.5514	61.58
	300	0.4555	68.27	0.4693	67.30
	400	0.3418	76.18	0.3565	75.16
	500	0.2745	80.87	0.2891	79.85