Nanoscale corrosion behavior of polycrystalline copper fine wires in dilute NaCl solution investigated by in-situ atomic force microscopy

Abstract

In this study, nanoscale corrosion behavior of copper fine wires in dilute NaCl solution is studied by atomic force microscopy and electron backscatter diffraction technique. The dissolution rate of the grains constituting the wires strongly depends on their crystallographic orientation. In pure water, the dissolution rate increases in the order of (111) < (001) < (110). Addition of Cl − dramatically increases the dissolution rate of the (111) surface to alter the order to (110) ≈ (001) ≈ (111) at 0.1 mM. These results show that the crystallographic orientation dependence is significantly changed by a slight increase of Cl − concentration in dilute solution.

In‐Situ Nanostructuring and Stabilization of Polycrystalline Copper by an Organic Salt Additive Promotes Electrocatalytic CO2 Reduction to Ethylene

“…Inorganic halide salts are well known for inducing nanostructuring process in copper surfaces . Thus, we decided to study the influence of the bromide counteranion in 1‐Br 2 on the formation of the observed nanocubes at the electrode surface.…”

“…Inorganic halide salts are well known for inducing nanostructuring process in copper surfaces. [36] Thus,wedecided to study the influence of the bromide counteranion in 1-Br 2 on the formation of the observed nanocubes at the electrode surface.W hen ap olycrystalline copper electrode is left in contact with an aqueous solution of KBr (20 mm)f or 5min, and then subjected to 3m easurements of potentiostatic electrochemical impedance spectroscopy (PEIS), AFM images show the presence of nanocubes similar in shape to those formed with additive 1-Br 2 ,w ith ah eight of ca. 80-90 nm ( Figure S17a).…”

Digital Holographic Study of pH Effects on Anodic Dissolution of Copper in Aqueous Chloride Electrolytes

“…Copper is one of the most important materials in the industry owing to its relatively noble properties. The anodic polarization of copper in acidic, neutral, and alkaline chloride media has received considerable attention in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. As the electro-dissolution of Cu is found to be complex, the various mechanisms proposed can be applied for chloride electrolytes.…”

“…In 2004, Kear et al, summarized copper corrosion in chloride electrolytes and concluded three different models of the initial electro-dissolution reactions of bare copper [1]. There are three possible initial reaction cases of the anodic polarization behavior of pure copper in acidic and neutral chloride media [1,10,12].…”

“…Case I presents the direct formation of cuprous ions [15,16,18,22,30], whereas cases II [17,[19][20][21][23][24][25][26]29,31] and III [27,28] involve the formation of cuprous chloride. It means that the reaction pathway is under debate up to the present in acidic and neutral chloride media [10,12,[18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”