Electrochemical studies on single-crystal aluminium surfaces

Abstract

AbstractÐThe electrochemical behaviour of single-crystal aluminium oriented in the (111), (110) and (100) directions in chloride-and indium-containing solutions was studied. It was found that the susceptibility of the single crystals to the onset of pitting attack in the chloride solution varied in the order (111)>(110)>(100). This was evident from pitting potential and induction time data, where the most noble pitting potential values and the longest induction periods were recorded for the (100) surface. This was explained in terms of dierences in the surface energy of (111), (110) and (100) planes. It was also found that cathodic reduction reactions (hydrogen evolution and oxygen reduction reactions) proceeded at a greater rate on the (100) surface. In addition, the time delay between the addition of indium ions to solution and the onset of activation of the immersed electrode by the indium species was shorter for the (100) surface. This was attributed to the more ecient incorporation of indium into the (100) lattice. #

Effect of Crystallographic Orientation on the Corrosion of Magnesium: Comparison of Film Forming and Bare Crystal Facets using Electrochemical Impedance and Raman Spectroscopy

“…For many metals and alloys, the corrosion rate has been found to exhibit strong dependence on crystallographic orientation [1][2][3][4][5]. Assessing anisotropic corrosion properties by using single crystal samples limits the number of facets tested [3,4,6,7]. While such studies give an indication of the corrosion properties of specific orientations, limitation to a few crystal planes can confound understanding of the corrosion properties of the system as a whole [3,4,6,7].…”

“…Assessing anisotropic corrosion properties by using single crystal samples limits the number of facets tested [3,4,6,7]. While such studies give an indication of the corrosion properties of specific orientations, limitation to a few crystal planes can confound understanding of the corrosion properties of the system as a whole [3,4,6,7]. This paucity of grain orientations at closely spaced h, k, l Miller-Bravais indices values falls short because corrosion properties can vary significantly over only a few degrees difference in crystallographic orientation [1].…”

“…Moreover, significant differences in findings as well as interpretation of crystal orientation effects on corrosion often occur [1][2][3][4][5][6][7][8][9][10][11][12][13]. For body-centered cubic (bcc) stainless steel in 0.6 M NaCl, the highest percentage of pitting events was observed on planes oriented ~25° away from {001} [8] while in contrast the {100} orientation was reported to have the highest corrosion rate in H 2 SO 4 [2] and NO 3 - [9].…”

Control of Crystallographic Orientation and Structural Characteristics for Electrodeposited Aluminum

“…[3][4][5][6][7] The control of the crystallographic orientation is one of the most important techniques for a semiconductor device process, crystal growth process and corrosion process. 26 Especially for aluminum, the crystallographic orientation has some influence on the occurrence of localized corrosion [27][28][29] and oxidation. [30][31][32] These reports show that the density of defect decreased in the order Al(111) > Al(110) > Al(100).…”

Microstructure-Based Numerical Modeling of Pitting Corrosion in 316 Stainless Steel

“…Researchers have observed variations in the pitting initiation behavior depending on exposed surface orientation in pure aluminum and aluminum alloys (22), beryllium (23)(24)(25)(26), and stainless steels (27,28). Specifically, Yasuda et.…”