Electrochemical corrosion behavior of Al7075 rotating disc electrode in neutral solution containing l-glutamine as a green inhibitor

Abstract

This is a study of the electrochemical corrosion behavior of aluminum alloy Al7075 and its corrosion inhibition using L-glutamine in 3.5% NaCl solution under different hydrodynamic conditions. The hydrodynamic conditions were simulated by using a rotating disc electrode. The results showed that an increase in rotation speed leads to a higher corrosion current density, while the charge transfer resistance decreases and corrosion potential shifts toward more positive values. The inhibition efficiency depends on rotation speed. That is, the efficiency was low in stagnant solution, but enhanced significantly under hydrodynamic conditions. The phenomenon was attributed to the increased mass transport of inhibitor's molecules to the electrode surface that is advantageous for improvement of inhibition efficiency. However, higher rotation speeds (X C 1,500 rpm) cause a slight reduction of efficiency due to higher shear stresses.

Study of the propolis extract as a corrosion inhibitor of copper alloy in ethylene glycol/water 0.1 M NaCl

“…In order to obtain the isotherm, the surface coverage degree (), which serves as a function of inhibitor concentration, was calculated by corrosion current density values in an attempt to explain the best isotherm. it is The the adsorption corresponds to the chemisorption [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Corrosion Inhibitors in Cooling Water Systems

“…For example, the protection efficiency of several amino acids for aluminum pitting corrosion in 0.1 M NaCl amino acids follows the following order: arginine > histidine > glutamine > asparagine > alanine > glycine [67]. Protective ability of L-glutamine for Al7075 alloy was low in unstirred solution, but it increases under hydrodynamic conditions [68]. The environment friendly inhibitors cysteine, N-acetylcysteine, and methionine were proposed for the protection of copper alloys [69,70].…”

Corrosion Inhibition Effect of Carbon Steel in Sea Water by L-Arginine-Zn2+System

“…The literature presents some studies involving amino acids on the corrosion prevention of mild steel [11], aluminium [12], and copper [13]. Naturally occurring organic substances as corrosion inhibitors for mild steel in acid have been investigated.…”