Table 4.
Binding energies (eV) and their assignments for XPS spectra observed for the X60-steel surface in the pickling solution without and with 2 × 10−4 M FSG6-6.
| X60-Steel in the Pickling Solution | X60-Steel in the Pickling Solution with 2.0 × 10−4 M FSG6-6 | ||||
|---|---|---|---|---|---|
| Core Element | BE, eV | Assignments | Core Element | BE/eV | Assignments |
| C 1s | 285.11 | −C−C− | C 1s | 285.06 | −C−H, −C−C− |
| 286.86 | −C−Cl | 286.80 | −C−N, −C−Cl | ||
| 288.55 | −C−N+ | ||||
| Cl 2p | 198.89 | Cl 2p3/2 | Cl 2p | 198.87 | Cl 2p3/2 |
| 200.48 | Cl 2p1/2 | 201.98 | Cl 2p1/2 | ||
| Fe 2p | 711.08 | Fe 2p3/2 of Fe2+ | Fe 2p | 711.00 | Fe 2p3/2 of Fe2+ |
| 714.36 | Fe 2p3/2 of Fe3+ | 713.20 | Fe 2p3/2 of Fe3+ | ||
| 718.79 | Satellite Fe 2p3/2 of Fe2+ | 716.84 | Satellite Fe 2p3/2 of Fe2+ | ||
| 724.37 | Fe 2p1/2 of Fe2+ | 720.00 | Satellite Fe 2p3/2 of Fe3+ | ||
| 727.78 | Fe 2p1/2 of Fe3+ | 724.64 | Fe 2p1/2 of Fe2+ | ||
| 727.72 | Fe 2p1/2 of Fe3+ | ||||
| 732.90 | Satellite Fe 2p1/2 of Fe3+ | ||||
| O 1s | 530.21 | FeO, Fe2O3 | O 1s | 530.04 | FeO, Fe2O3 |
| 531.10 | FeOOH | 531.18 | FeOOH | ||
| N 1s | 400.13 | -NR2 | |||
| F 1s | 689.24 | −C−F | |||
| I 3d | 619.63 | I3− | |||
| S 2p | 167.28 | −SO2− | |||