In the present investigation, three benzimidazole derivatives, namely, 4-(phenylwere synthesized and investigated as inhibitors for mild steel corrosion in 15% HCl solution using the weight loss, electrochemical polarization, and electrochemical impedance spectroscopy (EIS) techniques. It was found that the inhibition efficiency of these inhibitors increased with increasing concentration. The effect of temperature on the corrosion rate was investigated, and some thermodynamic parameters were calculated. Polarization studies showed that all three studied inhibitors were of mixed type in nature. The adsorption of the inhibitors on the mild steel surface in acid solution was found to obey the Langmuir adsorption isotherm. Scanning electron microscopy (SEM) was performed on inhibited and uninhibited mild steel samples to characterize the surface. The semiempirical AM1 method was employed for theoretical calculations, and the obtained results were found to be consistent with the experimental findings.

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Pleural fluid ADA has good diagnostic accuracy for TPE in Indian patients, and appears more useful at excluding TPE at a threshold value of around 40 IU/l.

In the present investigation, corrosion inhibition study of two synthesised amino acid compounds 2-amino-N-dodecylacetamide (ADA) and 2-amino-N-dodecyl-3-(4-hydroxyphenyl) propionamide (ADHP) has been performed for oil well tubular steel (N80) in 15%HCl using weight loss, electrochemical polarisation, ac impedance, Fourier transform infrared spectroscopy and SEM. The inhibition efficiencies of the inhibitors follow the sequence ADHP.ADA. The results showed that the inhibition efficiency of inhibitors increased with the increase in their concentration in 15%HCl solution. Both inhibitors act as mixed inhibitors and obey the Langmuir adsorption isotherm. The adsorption of the corrosion inhibitors at the surface of the N80 steel is the root cause of its corrosion inhibition.

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