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A STUDY ON TWO MODES OF INTERFACE INHIBITORS FORTHE CORROSION OF IRON IN HYDROCHLORIC ACID SOLUTION

CAO Chu'nan ZHANG Mingdi LIN Haichao (Corrosion Laboratory,Institute of Corrosion and Protection of Metals,Academia Sinica)  
For interface inhibitors in acid solutions,the inhibition may be divided into two modes, namely,that caused by geometrical blocking effect and that caused by negative catalytic effect.It can de- duced that for the former,ΔE_(corr),the difference between corrosion potentials of the metal in solutions with and without inhibitor,is nearly zero and the inhibition efficiency is proportional to the relative coverage esti- mated by interracial capacitance measurements,while for the latter,usually ΔE_(corr) is marked and the inhibi- tion efficiency cannot be proportional to the relative coverage.It was found that for iron in 1mol/l HCl. the inhibition was attributed to geometrical blocking effect for primary aliphatic amines and to negative catalytic effect for propargyl alcohol.In strong anodic polarization region where the Tafel law is followed, the coverage of adsorbed species does not change with electrode potential E for dodecyl amine while is in- creasing with the raising of E for tetradecyl amine.For propargyl alcohol as inhibitor for iron in HCl,the activation energy barrier of anodic dissolution of iron is decreasing with the raising of E with a value of ca.-73J·mol~(-1)·mV~(-1).
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