Abstract
The inhibitive effect of N, N-Bis (2-Chloroethylaminobenzaldehyde) ethylthiosemicarbazone (BCETSC) on the corrosion of mild steel in 1N H2SO4 was investigated by weight loss method, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The results showed that the inhibition efficiency increases with increase in concentration of the inhibitor. The potentiodynamic polarization curves revealed that BCETSC is a mixed type inhibitor in 1N H2SO4. EIS plots indicated that the addition of BCETSC increases the charge-transfer resistance of the corrosion process, and hence the inhibition performance. Scanning electron microscope (SEM) showed that the inhibition occurs due to adsorption of BCETSC molecules at the metal/solution interface. The free energy change value indicated that adsorption of BCETSC molecule is a spontaneous process and it adsorbs physically on mild steel surface. Keywords: Mild steel, Corrosion inhibition, N, N-Bis (2-Chloroethylaminobenzaldehyde) ethylthiosemicarbazone
Highlights
The use of inhibitors in acid solutions is one of the specimens were polished mechanically using emery most practical methods for the protection of metals papers of different grades and washed thoroughly with against corrosion
The coupons immersed in Bis (2-Chloroethylaminobenzaldehyde) ethylthiosemicarbazone (BCETSC) inhibitor solutions showed the reduced corrosion rate to a significant extent and thereby showing higher inhibition efficiencies
It can be seen that the inhibition efficiency increases with increase in concentration of BCETSC which suggests that inhibition is a result of adsorption of inhibitor on the metal surface and BCETSC acts as an adsorption inhibitor (Sorkhabi et al, 2005)
Summary
The use of inhibitors in acid solutions is one of the specimens were polished mechanically using emery most practical methods for the protection of metals papers of different grades and washed thoroughly with against corrosion N-heterocyclic compounds with polar groups and/or π- reaction of N, N-Bis (2-Chloroethylaminobenzaldehyde) electrons are effective corrosion inhibitors in acidic with the appropriate ethylthiosemicarbazide in ethanol solutions. Organic molecules of this type can be media (Ashassi et al, 2005). The mild steel describes the investigation of inhibitive action of BCETSC specimens were immersed in hanging position in blank on corrosion of the mild steel in 1N H2SO4 solution using and the different concentrations of inhibitor solution for 2 weight loss, potentiodynamic polarization, hours. The mild steel specimens electrochemical impedance spectroscopy (EIS) and were carefully washed in double distilled water, dried and scanning electron microscopy (SEM). 93.35 where, w and w’ are weight losses in the absence and presence of inhibitor respectively
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