Abstract
The corrosion inhibition of mild steel in 1 N sulphuric acid solution by 2,6-diphenylpiperidin-4-ones with various substituents at 3- and 3,5-positions (01–06) has been tested by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopic methods, and FTIR and UV absorption spectra. The surface morphology of the mild steel specimen has been analyzed by SEM. The effect of temperature (300 to 323 ± 1 K) on the corrosion behavior of mild steel in the presence of the inhibitors (01–06) was studied using weight loss techniques. The effect of anions (Cl−, Br−, and I−) on the corrosion behavior of mild steel in the presence of the same inhibitors was also studied by weight loss method and the synergism parameters were calculated. The adsorption characteristics of the inhibitors have been determined from the results.
Highlights
Corrosion inhibitors find vast application in the industrial field as components in acid descaling, oil well acidizing, acid pickling, acid cleaning, and so forth
The plots confirm that the inhibition efficiency of all the studied inhibitors (01–06) increases with increase in concentration of the inhibitor
The extent of inhibition depends on the substituents at 3position or 3,5-positions of the 2,6-diphenylpiperidin-4-one
Summary
Corrosion inhibitors find vast application in the industrial field as components in acid descaling, oil well acidizing, acid pickling, acid cleaning, and so forth. Most of the effective inhibitors used contain heteroatom such as O, N, S, and multiple bonds in their molecules through which they are adsorbed on the metal surface. It has been observed that adsorption depends mainly on certain physiochemical properties of the inhibitor group, such as functional groups, electron density at the donor atom, π-orbital character, and the electronic structure of the molecule [1,2,3,4,5,6,7,8]. Several researchers investigated the corrosion inhibiting properties of organic compounds on mild steel in acidic medium [9,10,11,12]. The aim of this work was to investigate the effect of substitution at 3- and 3,5-positions of 2,6-diphenylpiperidin-4-one on the corrosion inhibition of mild steel 1 N H2SO4 solution. Corrosion inhibition was investigated using weight loss, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (Tafel) methods and their results were compared
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