Research Article

Copper Corrosion Inhibition in 1โ€‰M HNO3 by Two Benzimidazole Derivatives

Table 2

Calculated parameters from modified Langmuir isotherm and El-Awady adsorption isotherm at ๐ถ = 10โˆ’3โ€‰M.

InhibitorTemperature ๐‘‡ (K)Modified Langmuir isothermEl-Awady isotherm
๐พ a d s ฮ” ๐บ โˆ˜ a d s Slope ๐‘… 2 ๐พ a d s ฮ” ๐บ โˆ˜ a d s 1/ ๐‘ฆ ๐‘… 2
(105โ€‰Mโˆ’1)(kJยทmolโˆ’1)(105โ€‰Mโˆ’1)(kJยทmolโˆ’1)

MBI2980.71โˆ’31.930.9680.9990.63โˆ’31.630.9410.998
3080.77โˆ’33.190.9920.9990.71โˆ’32.980.9570.997
3180.83โˆ’34.481.0050.9990.85โˆ’34.521.0060.998
3281.00โˆ’36.061.0040.9990.91โˆ’35.800.9820.973
3381.01โˆ’37.161.0160.9991.16โˆ’37.581.0670.996

TMBI2980.80โˆ’32.181.0070.9990.84โˆ’32.331.0290.984
3080.96โˆ’33.880.9770.9990.90โˆ’33.580.9490.994
3181.11โˆ’35.230.9820.9991.02โˆ’35.000.9640.990
3281.15โˆ’36.440.9980.9991.19โˆ’36.551.0090.995
3381.25โˆ’37.491.0080.9992.96โˆ’40.201.0510.996