International Journal of Corrosion / 2020 / Article / Tab 2 / Research Article
Electrochemical and Thermodynamic Investigation on Corrosion Inhibition of C38 Steel in 1M Hydrochloric Acid Using the Hydro-Alcoholic Extract of Used Coffee Grounds Table 2 Electrochemical parameters of C38 steel in 1 M HCl at different temperature and with different concentrations of HECG.
T (K)C (g/L)−E corr (mV/SCE) −β c (mV) β a (mV)i corr (µ A/cm2 )IE (%) θ 293.15 Blank 467.56 165.1 107.7 471.84 — — 0.25 477.53 123.4 142.3 41.16 91.27 0.91 0.5 463.793 132.9 139.3 32.62 93.08 0.93 1 495.877 172.4 185.1 29.34 93.78 0.93 1.5 468.165 142.7 114.6 14.88 96.84 0.96 2 512.528 244.5 200.7 12.42 97.36 0.97 303.15 Blank 434.966 186.6 114.5 617.13 — — 0.25 463.368 104.3 85.4 67.89 88.99 0.89 0.5 437.249 119.3 71.9 60.00 90.27 0.90 1 446.862 112.9 74.4 57.40 90.69 0.90 1.5 422.386 94.9 51.3 34.99 94.33 0.94 2 483.017 129.1 117.0 29.98 95.14 0.95 313.15 Blank 433.281 131.0 98.7 989.88 — — 0.25 473.608 104.8 97.3 116.06 88.27 0.88 0.5 428.600 131.9 69.9 97.98 90.10 0.90 1 450.438 117.7 85.3 96.09 90.29 0.90 1.5 442.139 107.2 58.0 62.95 93.64 0.93 2 501.132 198.6 222.4 60.00 93.93 0.93 323.15 Blank 440.487 129.1 105.1 1 794.01 — — 0.25 453.151 156.9 101.5 230.14 87.17 0.87 0.5 466.388 136.7 110.0 198.26 88.94 0.88 1 439.245 158.0 91.8 179.23 90.00 0.90 1.5 465.691 129.1 115.6 150.26 91.62 0.91 2 512.063 288.3 444.0 130.65 92.71 0.92