3-Formylindole-4-aminobenzoic Acid: A Potential Corrosion Inhibitor for Mild Steel and Copper in Hydrochloric Acid Media

Table 1

The corrosion rate and percentage of inhibition efficiency obtained for (a) MS specimens and (b) Cu specimens immersed in 1 M HCl at 28°C for 24 h in the presence and absence of 3FI4ABA.

(a)

𝐶 (mM)	Corrosion rate (mmy^−1)	Inhibition effiiency (𝜂𝑊%)
0	9.11	—
0.1	5.31	41.71
0.2	2.86	68.58
0.3	2.18	76.01
0.4	1.55	82.94
0.5	1.31	85.58
0.6	1.10	87.86
0.7	1.03	88.69
0.8	1.05	88.40

(b)

𝐶 (mM)	Corrosion rate (mmy^−1)	Inhibition efficiency (𝜂𝑊%)
0	0.6002	—
0.1	0.2400	60.0
0.2	0.2315	61.4
0.3	0.2300	61.7
0.4	0.2280	62.0
0.5	0.2203	63.3
0.6	0.2187	63.6
0.7	0.2141	64.3
0.8	0.2045	65.9