Electrochemical noise and impedance study of aluminium in weakly acid chloride solution

Abstract

The electrochemical noise (EN) characteristics of pure aluminium in unbuffered potassium chloride solution and with acetic acid/sodium acetate buffer at pH 5.4 and 4.3 have been analysed to throw light on the influence of pH and of the presence of buffer at the aluminium surface on chloride ion-induced corrosion. Comparison has been made with results obtained by electrochemical impedance spectroscopy (EIS) and quantitative deductions made concerning the values of the noise resistance and the magnitude of the electrochemical impedance. Deviations between results obtained by the two experimental techniques are discussed.

Electrochemical Study on Corrosion Inhibition of Copper in Hydrochloric Acid Medium and the Rotating Ring-Disc Voltammetry for Studying the Dissolution

“…From the relative current of the two peaks (peaks 1 and 2 of Figures 3(a) and 3(b)), it could be concluded that at higher polarization potential copper preferably dissolved as soluble Cu(II) soluble species and the proportion of formation of soluble Cu(I) species was reduced. The literature's [38][39][40][41] reports about the mechanism of dissolution of copper in aqueous solution agreed well with the present observation from RRDE measurements.…”

Effect of Copper and Silicon Carbide Content on the Corrosion Resistance of Al-Mg Alloys in Acidic and Alkaline Solutions

“…This problem in case of Al-based metal matrix composite is due to the formation of stable tenacious oxide film, resulting in poor wettability with the ceramic particle. One of the common practices to improve wettability of an Al melt is through addition of small amount of reactive metals like magnesium and titanium prior to the incorporation of ceramic particle [1,3]. However, in the present work, 4…”

“…The major limitation in many cases in fabricating metal matrix composites by liquid phase route resides upon the incompatibility of the reinforcement and the matrix [1][2][3]. This problem in case of Al-based metal matrix composite is due to the formation of stable tenacious oxide film, resulting in poor wettability with the ceramic particle.…”

“…Studying corrosion resistance of Al-based materials is important especially for automotive and aircraft applications where the parts are prone to corrosive media like salt water solutions, acidic and alkaline media. Aluminum based composites are usually reinforced by Al 2 O 3 , SiC, and C. The major advantages of AMCs compared to unreinforced materials are as follows: greater strength, improved stiffness, reduced density, good corrosion resistance, improved high temperature properties, controlled thermal expansion coefficient, thermal/heat management, improved wear resistance and improved damping capabilities [1][2][3][4][5][6]. Nowadays, the increased demand for light weight components, primarily driven by the need to reduce energy consumption in a variety of societal and structural components, has led to an increase in the use of aluminum.…”

Application of Electrochemical Techniques and Mathematical Simulation in Corrosion and Degradation of Materials

“…Since the 90ties a preponderant importance has been given to the study of this phenomenon to explain the dynamics and mechanisms of the electrochemical processes taking place in the electrified interface (Gouveia-Caridade et al, 2004;Kearns et al, 1996;García-Ochoa et al, 1996;Hladky & Dawson, 1980;Loto & Cottis, 1987).…”