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).

TimeDPASV modeDPP mode
Conc* CR**% inhibitionConc*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 h7.910.01093.37.810.01093.3

Corrosion concentration 102 milligram.
**Corrosion rate 102 milligram centimeter−2 hour−1.