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.
Highlights
Corrosion is a destructive phenomenon, which can attack any material or alloy due to interactions with the surrounding medium that leads to a deterioration of metal physical and chemical properties. according to this definition term corrosion can include all materials, metals and non-metals [1, 2]
The advantage is the use of aluminum is due to their excellent corrosion resistance property and it has excellent formability, low density, high thermal and electrical conductivity, and it becomes a seniority in materials selections in most industries [4, 5]
2.Materials and Method The experiments were performed with aluminum alloy 6061 of following composition as shown in Table1 of 2mm thickness which was mechanically press-cut into circular form 2cm diameter
Summary
Corrosion is a destructive phenomenon (chemical or electrochemical), which can attack any material or alloy due to interactions with the surrounding medium that leads to a deterioration of metal physical and chemical properties. according to this definition term corrosion can include all materials, metals and non-metals [1, 2]. According to this definition term corrosion can include all materials, metals and non-metals [1, 2]. Aluminum has an attractive appearance and good resistance to corrosion when exposed to atmosphere or various aqueous environments because its ability to form a highly compact passive oxide layer [7,8,9]. These properties made aluminum one of the most attractive materials for industrial applications like automobiles, aviation, aerospace, food handling, containers, electronic devices, buildings, marine, etc[10]. Three concentrations of the inhibitor (Gallic acid) were used 3 10 , 6 10 and 9 10 mol. dm
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