Glutamic Acid as Corrosion Inhibitor for Aluminium in Acidic Medium

Abstract

Corrosion behavior of aluminium in 0.6 mol. dm -3 NaCL solution in acidic medium ( ) was investigated in the absence and presence of different concentrations of amino acid, glutamic acid, as environmentally -friendly corrosion inhibitor over temperature range (293-308)K. The investigation involved electrochemical polarization method using potentiostatic technique and optical microscopy, the inhibition efficiency increased with an increase in inhibitor concentration but decreased with increase in temperature. Results showed that the inhibition occurs through adsorption of the inhibitor molecules on the metal surface and it was found to obey Langmuir adsorption isotherm. Some thermodynamic parameters ( ) and activation energy ( )were calculated to elaborate the mechanism of corrosion inhibition. The polarization measurements indicated that glutamic acid is of mixed type. The surface characteristic of the inhibited and uninhibited metal samples were investigated by optical microscopy.

Corrosion Protection of Carbon Steel Using Expired Drug in Acidic Medium

“…Implementing Equation ( 4) gives us a prediction that by plotting log (CR) vs. 1/T the linear relation would be achieved, as supported with the experimental data. The slope of this line presents us with -Ea./R and the extrapolated line intersects at T = 0, providing us with ln A [20] As illustrated by Fig ( 2), the Arrhenius plots with and without varying does of expired Orlistat have been presented through the log CR versus 1/T for corrosion of carbon steel in 1.5 M HCl. In this equation, N = is commonly referred to as the Avogadro number-(6.022 × 10^2 3 mol^-1 ) and (h)= signifies the Planck's Constant -(6.626 × 10^-34 J•s).…”

Improved optical and mechanical characteristics of multilayered Cu/TiON/CrO2 coating via heat treatment for solar absorbing applications

“…This could be attributed to the efficient release of the lattice strain in addition to the agglomeration of larger grains around the preferential orientations of both TiON and CrO2 phases [14,15]. The grain sizes and the lattice parameters of synthesized thin Cu/TiON/CrO2 films were calculated using the Scherrer formula, Bragg's equation, and the Bravais lattice system for cubic features [16,17].…”