Inhibitor Conc., (ppm) OCP (V)vs. SCE Ecorr (V) vs. SCE ba (V dec-1) bc (V dec-1) Icorr (A cm-2) C.R. mpy I.E, (%) RP
Blank -0.202 -0.3284 0.2126 0.4745 4.72e-4 5.89 ------ 354.89
25 -0.188 -0.2788 0.1974 0.4745 8.43e-5 1.05 82 784.15
100 -0.200 -0.2837 0.1003 0.2547 5.87e-5 0.73 88 532.67
150 -0.188 -0.2857 0.1248 0.2599 2.60e-5 0.33 94 1401.70
200 -0.223 -0.3180 0.2684 0.1208 2.78e-5 0.35 94 1406.30
250 -0.137 -0.2651 0.1524 0.2702 1.99e-5 0.24 96 2126.20
300 -0.222 -0.2830 0.2447 0.3020 5.75e-5 0.72 87 1020.50
0.01M Na2S -0.752 -0.4350 0.7544 1.3995 2.09e-4 2.6123 --- 1018.50
250+HS- -0.198 -0.4342 0.2285 0.2999 3.30e-5 0.4124 84 1707.00
Table 1: Electrochemical parameters and inhibition efficiency for brass in 3.5% NaCl containing different concentrations of SOTB.