A Comparative Study on the Electrochemical Behaviour of Aluminium and 8090 Al-Li-Cu-Mg Alloy in Acid Rain Solution

Abstract

The growth mechanism and properties of the oxide films on aluminium and 8090 Al-Li-Cu-Mg alloy were studied in simulated acid rain (pH 4.5) by electrochemical techniques, cyclic voltammetry and electrochemical impedance spectroscopy. The potentiodynamic formation of anodic oxide film on aluminium and 8090 Al-Li-Cu-Mg alloy surfaces were described in terms of high field model. This is justified by the obtained values of kinetic parameters: the electric field strength (~10 6 V cm -1 ), ionic conductivity through the film (~10 -12 S cm -1 and 10 -13 S cm -1 ) and half jump distance (~0.150 nm). The impedance data shows that protective passive oxide film on aluminium and Al-Li-Cu-Mg alloy can be formed spontaneously at the open circuit potential in the studied solution with a high resistance (119 k cm 2 for Al and 144 k cm 2 for Al-Li-Cu-Mg alloy). Both electrochemical techniques revealed that the oxide film on Al-Li-Cu-Mg alloy has better protective properties than pure aluminium. The concentration of the metallic ions released into solution from aluminium and Al-LiCu-Mg alloy and measured by atomic absorption spectroscopy was in accordance with the results obtained from the electrochemical techniques.

Effect of Helichrysum italicum on the Electrochemical Corrosion Behaviour of Iron in Simulated Acid Rain Solution

“…These oxides in contact with water in the atmosphere cause a formation of an acid rain (sulphuric and nitric acids) and promote the corrosion. [13][14][15][16][17] A rainfall with pH < 5.6 is considered the acid rain. The importance of the protection against corrosion in acidic solutions is increased by the fact that iron and steel are more susceptible to be attacked in aggressive media.…”

Tafel Polarization and Impedance Studies of Al-7075 Alloy and Its Composites in Different Medium.

“…Impedance measurements were carried out by making use of AC signal of small amplitude around 10 mV and 10 -5 Hz -1MHz frequency range and Nyquist plots were recorded at OCP for different corrodents [25,26]. The resistance between WE and RE is computed from the Z" vs Z' plot.…”

A Bibliometric Analysis of Research on Acid Rain

“…AR has been a serious global problem for several decades in many regions, and the response of various ecosystems to AR stress and the profound negative effects have been studied [16,78,79]. Recently, many studies have focused on the metallic material electrochemical behavior (including corrosion behavior) [82][83][84][85], reinforced-concrete structure seismic behavior and performance [86], composites wear behavior [87,88], and element leaching behavior in metal-contaminated soil [89] under AR stress. Phosphorus-related research has also become attractive to researchers.…”