Research Article
3-Formylindole-4-aminobenzoic Acid: A Potential Corrosion Inhibitor for Mild Steel and Copper in Hydrochloric Acid Media
Table 4
Electrochemical impedance parameters of (a) MS specimens and (b) copper specimens in 1 M HCl at 28°C in the absence and presence of 3FI4ABA.
| (a) |
| | (mM) | (Ω cm2) | (F cm−2) | (Ω cm2) | |
| | 0 | 10.8 | 102 | 3.78 | — | | 0.2 | 23 | 76 | 5.0 | 53 | | 0.5 | 65 | 80.6 | 11.6 | 83.4 | | 0.7 | 203.2 | 66.9 | 15.2 | 94.7 | | 0.8 | 478 | 53.6 | 21.9 | 97.7 |
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| (b) |
| | (mM) | (Ω cm2) | (F cm−2) | (Ω cm2) | |
| | 0 | 144 | 760 | 16.2 | — | | 0.2 | 345 | 370 | 42 | 58 | | 0.5 | 525 | 475 | 31.1 | 72.5 | | 0.7 | 553 | 267 | 46.3 | 74 | | 0.8 | 919 | 228 | 92.1 | 84 |
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