Isatin derivatives as a non-toxic corrosion inhibitor for mild steel in 20% \H2SO4\
By K.R. Ansari and M.A. Quraishi and Ambrish Singh
Published in Corrosion Science
NULL
2015
Abstract
The corrosion inhibition action of Isatin-?-thiosemicarbzone derivatives namely 1-Benzylidene-5-(2-oxoindoline-3-ylidene) Thiocarbohydrazone (TZ-1) and 1-(4-Methylbenzylidene)-5-(2-oxoindolin-3-ylidene) Thiocarbohydrazone (TZ-2) was studied on mild steel surface in 20% \H2SO4\ by gravimetric measurements, Electrochemical measurements (EIS and Tafel), SEM, \EDX\ and quantum chemical methods. Potentiodynamic polarization curves reveal that the \TZs\ act as mixed type inhibitors exhibiting predominantly cathodic behavior. The adsorption of \TZs\ obeys the Langmuir adsorption isotherm. The thermodynamic parameters (Ea, Kads, ?G
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