Abstract
Fractal dimension is a versatile method to study and evaluate corrosion from the point of view of metallic conditions, namely: surface roughness, electrochemical measurements and microscopy images. Aluminum corrodes at different rates, under different pH electrolytes with or without the presence of chloride ions. In this work, corrosion and the surface roughness for aluminum corrosion at different pH electrolytes: acid, with and without chlorides, neutral and basic solutions, were obtained. It was measured and obtained using electrochemical and optic techniques. The results of Electrochemical Impedance Spectroscopy (EIS) and Noise Measurements (ENM), Digital Holographic Microscopy (DHM), Scanning Electron Microscope (SEM) micrographs and their respective Fractal Dimension analysis were obtained.. For the different experimental techniques and conditions, fractal dimension was obtained and presented, reflecting the surface condition of aluminum corrosion as a function of pH solution.
Highlights
Euclidian geometry based on the properties of regular forms such as point, lines, surfaces and volumes classifies them in dimensions shown by integer numbers: 0, 1, 2 and 3, respectively
The aims of the present work was to show the possibility of fractal dimension relations obtained and compared from different electrochemical techniques, of the corrosion performance of aluminum samples, To determine the metal surface characteristics shown as the surface fractal dimension, calculated from Electrochemical Impedance Spectroscopy (EIS) measurements and compared with the one obtained through the H exponent calculated from EN measurements, and evidenced by digital holographic and Scanning Electron Microscope (SEM) images and their fractal dimensions obtained
Reactive aluminum can develop a passive film protecting it from electrochemical corrosion in neutral and some solutions but it is attacked in basic electrolytes [69]
Summary
Euclidian geometry based on the properties of regular forms such as point, lines, surfaces and volumes classifies (ideal abstractions) them in dimensions shown by integer numbers: 0, 1, 2 and 3, respectively. Corrosion is the gradual destruction of metallic materials by electrochemical reaction with their environment rendering the surface rough, porous or pitted, reducing the metal thickness and diminishing their mechanical properties. The procedure to determine the surface roughness, is defining a height or depth that contains the profile information of the surface. This can be obtained either by measuring the surface with a profile meter, through atomic force microscopy (AFM) image, or by optical methods such as: optical interferometric measurements or light scattering [28]. Roughness characteristic may be related to the corrosion attack observed [9]
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