ANTI-CORROSION PERFORMANCE OF 1,3-BENZOTHIAZOLE ON 410 MARTENSITIC STAINLESS STEEL IN H2SO4
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The corrosion inhibition e®ect of synthesized 1,3-benzothiazole at very low concentrations on 410
martensitic stainless steel in 3MH2SO4 solution was studied through potentiodynamic polarization
and weight loss measurements. The observation showed that the organic compound performed
e®ectively with average inhibition e±ciencies of 94% and 98% at the concentrations studied from
both electrochemical methods due to the inhibition action of protonated inhibitor molecules in the
acid solution. The amine and aromatics functional groups of the molecules active in the corrosion
inhibition reaction were exposed from Attenuated total re°ectance-Fourier transform infrared
spectroscopy (ATR-FTIR) spectroscopic analysis. Thermodynamic calculations showed cationic
adsorption to be chemisorption adsorption, obeying the Langmuir adsorption isotherm. Images from
optical microscopy showed an improved morphology in comparison to images from corroded
stainless steel. Severe surface deterioration and macro-pits were observed in the uninhibited samples.
Keywords
TJ Mechanical engineering and machinery