Gallic Acid as Corrosion Inhibitor for Aluminum 6061 in Alkali Solutions

Abstract

The research aims to study the corrosion of aluminum alloy(6061) in 0.6 mol. dm-3 NaCl solution in base medium was examined with out and with Gallic acid as environmentally – friendly corrosion inhibitor at temperature range (298-313)K. The inhibitive action of gallic acid on corrosion of aluminum alloy(6061) in KOH solution was examined through electrochemical polarization method using potentiostatic technique and surface analysis by optical microscopy, Polarization measurements indicate that the examined compound act as a mixed type inhibitor. Results appeared that the inhibition occurs through adsorption of the inhibitor molecules on the metal surface and it was obeyed Langmuir adsorption isotherm. Some thermodynamic parameters activation energy were calculated to elaborate the mechanism of inhibition. The surface characteristic of the inhibited and uninhibited metal samples were examined by optical microscopy.

Corrosion Protection of Carbon Steel Using Expired Drug in Acidic Medium

“…K: represents the surface coverage of the inhibitor, while A: represents the surface coverage of the outer layers of the carbon steel specimens. The time spent underwater is determined by the number of days measured [15,16].…”

Corrosion Behavior of AA 1100 Anodized in Gallic-Sulfuric Acid Solution

“…Gallic acid application as a corrosion inhibitor for Al and other metals had also been explored. Ali et al reported that it can function as a mixed type inhibitor for AA6061 exposed to alkali solutions [17]. Keny et al.…”