ANTI-CORROSION PERFORMANCE OF 1,3-BENZOTHIAZOLE ON 410 MARTENSITIC STAINLESS STEEL IN H₂SO₄

Abstract

The corrosion inhibition e®ect of synthesized 1,3-benzothiazole at very low concentrations on 410 martensitic stainless steel in 3 MH 2 SO 4 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.

Electrochemical analysis of the corrosion inhibition effect of trypsin complex on the pitting corrosion of 420 martensitic stainless steel in 2M H2SO4 solution

“…The highest Δ G o ads value is -22.20KJmol -1 at the lowest TC concentration; while the lowest Δ G o ads value is -20.76KJmol -1 at the highest TC concentration on 420SS surface due to the effect of lateral repulsion among LTC molecules at higher TC concentration. The Δ G o ads values shows physisorption adsorption mechanisms on 420SS surface, confirming earlier assumption that the inhibition mode is through surface coverage [ 18 , 19 ].…”