Research Article
Evaluation of Nitrilotrimethylene Phosphonic Acid and Nitrilotriacetic Acid as Corrosion Inhibitors of Mild Steel in Sea Water
Table 2
Binding energies (eV) of elements present on mild steel surface after and before treatment with inhibitors.
| | Solution | Fe 2p3/2 | O 1S | O1S | Cl 2p1/2 | Cl 2p3/2 | P 2p | C 1S | N 1S | | O | OH |
| | Sea water | 717.3 | — | 537.5 | — | 204.3 | — | — | — | | 3 ppm NTP | 718.2 | 536.7 | 537.6 | 197.6 | 203.7 | 140.0 | 289.5 | 407.2 | | 300 ppm NTP | 717.6 | 536.2 | 537.4 | 197.7 | 205.4 | 139.1 | 290.4 | 405.7 | | 130.6 | | 3 ppm NTA | 717.9 | 536.1 | 537.4 | 196.5 | 204.4 | — | 289.7 | 405.5 | | 300 ppm NTA | 717.1 | 536.1 | 537.2 | 196.5 | 205.3 | — | 290.3 | 405.9 |
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