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| THE EFFECT OF MEREAPTO-GROUP ON THE INHIBITIVE FUNCTION OF BENZOTHIAZOLE IN HC1 SOLUTIONS |
| Chen Jiajian Cao Jiashou (Changchun Institute of Applied Chemistry;Academia Sinica) |
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Abstract The inhibiting effect of benzothiazole(BT)and 2-mereaptobenzothiazole (MBT)and the effect of -SH group in this respect on the corrosion of a car- bon steel in HCl solutions at various concentrations and temperatures were investigated.It is shown that the inhibiting effect of MBT is much more pro- nounced than that of BT due to increased surface activity of BT raised by -SH group.Langmiur isotherm equation is observed by both compounds ad- sorbed on steel surface when their concentrations in HCl solutions are not very high.The values of the equilibrium constant B of the adsorption process were determined at θ=0.5.It was found the value of B for MBT (10~5 is of one order of magnitude higher than that for BT(10~4).Impedance measure- ments showed that for both compounds the data of electrode boundary capa- citance which vary with the value of θ fall on the same straight line,and the same value of boundary capacitance (14μF/cm~2)was obtained by extra- polating the experimental data to θ=1.These facts imply that there are no changes in the characteristics of adsorption and the mode of arrangements of the molecules adsorbed on the electrode surface when the -SH group is intro- duced onto the BT.Polarization measurements indicated that both inhibitors belong to the mixed type with predominant anodic control.However,the inhibitive action to the cathodic reaction of the corrosion process is some- what strengthened by introducing the -SH group onto BT molecules.
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Received: 25 August 1982
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