Research Article
Corrosion and Inhibition Effects of Mild Steel in Hydrochloric Acid Solutions Containing Organophosphonic Acid
Table 3
Corrosion rates with respect to Fe(II) + Fe(III) for mild steel in 10% HCl solution with NTMP inhibitor (170 mg/L).
| Time | DPASV mode | DPP mode | Conc* |
CR** | % inhibition | Conc* | CR** | % inibition |
| (1) 5 min | 6.28 | 2.530 | 55.6 | 6.26 | 2.52 | 55.7 | (2) 10 min | 6.41 | 1.290 | 59.9 | 6.41 | 1.290 | 59.9 | (3) 20 min | 6.99 | 0.693 | 63.9 | 6.99 | 0.693 | 63.9 | (4) 1 h | 7.18 | 0.235 | 71.6 | 7.02 | 0.235 | 71.6 | (5) 2 h | 7.21 | 0.119 | 80.0 | 7.12 | 0.119 | 80.6 | (6) 24 h | 7.91 | 0.010 | 93.3 | 7.81 | 0.010 | 93.3 |
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Corrosion concentration 102 milligram.
**Corrosion rate 102 milligram centimeter−2 hour−1.
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