Inhibitive action of gramine towards corrosion of mild steel in deaerated 1.0M hydrochloric acid solutions

Abstract

a b s t r a c tThe effect of addition of gramine on mild steel dissolution in deaerated 1.0 M hydrochloric acid was studied through potentiodynamic polarisation curves, electrochemical impedance spectroscopy and gravimetric measurements in the temperature range from 25°C to 55°C. Gramine was found to shift the corrosion potentials towards less noble values and decrease both dissolution of mild steel and hydrogen evolution reaction. Gramine did not affect the corrosion reaction mechanism (blocking effect). Results obtained from the several measurement techniques were in good agreement and revealed good inhibition efficiencies in the concentration range (0.75 mM Ä 7.5 mM) particularly at higher concentrations.

Adsorption Properties and Inhibition of C38 Steel Corrosion in Hydrochloric Solution by Some Indole Derivates: Temperature Effect, Activation Energies, and Thermodynamics of Adsorption

“…The effect of temperature on the inhibited acid-metal reaction is highly complex, because many changes occur on the metal surface such as rapid etching and desorption of inhibitor and the inhibitor itself may undergo decomposition and/or rearrangement. Temperature effects on acidic corrosion and corrosion inhibition of iron and steel most often in HCl and H 2 SO 4 solutions had been the object of a large number of investigations [1][2][3][4][5][6][7][8][9][10][11][12]. However, it was found that few inhibitors with acid-metal systems have specific reactions which are effective (or more) at high temperature as they are at low temperature [13][14][15].…”

Synergistic and hydrogen bonded interaction of alkyl benzimadazoles and urea pair on mild steel in hydrochloric acid: Adsorption, electroanalytical and theoretical studies

“…Among numerous inhibitors, hetero cyclic compounds are considered to be the most effective corrosion inhibitors for steel in acid solutions [4]. Different N-heterocyclic compounds were reported as reasonably good corrosion inhibitors for steel in acid media, such as imidazoline derivative [2,5], 1,2,3-triazole derivative [2,[6][7][8][9][10][11], benzotriazole [2,12,13], pyrole [2,14], pyridine derivatives [2,15,16], pyrazole derivatives [2,17], bipyrazole derivatives [2,18], pyrazine derivative [2,19], pyridazine derivative [2,20], indole derivative [2,21], benzimidazole derivatives [2,22,23], quinoline derivatives [2,24], purine derivatives [2,25,26] and tetrazole derivatives [2,[27][28][29]. They exhibit inhibition by adsorption on the metal surface, and the adsorption takes place through N, O and S atoms, as well as those with triple or conjugated double bonds or aromatic rings in their molecular structures.…”

Adsorption and inhibition effect of two aminopyrimidine derivatives on steel surface in H2SO4 solution

“…Previously, many N-heterocyclic compounds are reported as good corrosion inhibitors for steel in acid media, such as imidazoline derivatives [3], 1,2,3-triazole derivatives [4], 1,2,4-triazole derivatives [5], benzotriazole [6], pyrrole [7], pyridine derivatives [8], pyrazole derivatives [9], bipyrazole derivatives [10], pyrazine derivatives [11], pyridazine derivatives [12], indole derivatives [13], benzimidazole derivatives [14], quinoline derivatives [15], purine derivatives [16] and tetrazole derivatives [17]. They exhibit inhibition by adsorption on the steel surface, and the adsorption takes place through N, O, and S atoms, as well as those with triple or conjugated double bonds or aromatic rings in their molecular structures.…”