Communication—Real-Time Surface Observation of Copper during Anodic Polarization with Channel Flow Double Electrode

Abstract

A real-time surface observation system with a channel flow double electrode was developed for analysis of initiation of corrosion pits on copper during anodic polarization. In this system, a video of the surface morphology of a working electrode (WE) is taken by an optical microscope combined with a charge-coupled device camera, and the metallic ions dissolved from the WE can be detected by arranging a detecting electrode (DE) downstream of the WE. It was confirmed that the initiation of micrometer-size pits on copper corresponded to the oscillation of dissolution current of cuprous ions.

Atomic Emission Spectroelectrochemistry: Real-Time Rate Measurements of Dissolution, Corrosion, and Passivation

“…For example the variation of pH during linear scan polarization of Al alloys was presented in Serdechnova, et al 51 Other techniques are possible such as downstream electrochemical or UV-visible detection. For example, electrochemical detection was used to quantify the dissolution rates of Cu(I) and Cu(II) during the anodic dissolution of Cu-Zn alloys in a channel flow double electrode by Hoshi, et al, [99][100] and UV detection was used to monitor xanthate adsorption and desorption during a simulated electrochemical flotation of chalcopyrite with a flow spectroelectrochemical system by Walker, et al 101 There is much to be developed along these lines.…”

Communication—The pH Detection of Magnesium Dissolution during Anodic Polarization with Channel Flow Double Electrode

“…Details of video recording were described in our previous work. 8 The observation surface area of the WE was 2.75 mm 2 . The electrochemical measurements were conducted at 298 K by using a dual potentiostat/galvanostat (Hokuto Denko, HR-101B) with a function generator (Hokuto Denko, HB-111).…”

“…In the CFDE, the metallic ions dissolved from the working electrode (WE) can be detected by a detecting electrode (DE) downstream of the WE. 7,8 Because the DE was used as a pH sensor in the pH sensing CFDE, the hydroxide ions (OH − ) generated during the anodic polarization of magnesium (WE) can be detected at the pH sensor (DE). The time delay of the OH − to across the gap between the two electrodes is of the order of millisecond, 7 and the HE rate could be estimated from pH values without hydrogen gas collection as is done in other methods.…”

Detection of Hydrogen Gas Generated upon Magnesium Dissolution Using a Gas Chromatograph–Channel Flow Electrode System

“…5 Because the pH of the electrolyte increases owing to the Mg dissolution during these measurements, it is difficult to investigate the effect of electrolyte pH on HE efficiencies of Mg dissolution, which critically affects battery performance. 10 In this study, we developed an in situ gas detection system comprising a channel flow electrode (CFE) [11][12][13] and gas chromatograph. In this system, a gas-liquid separator tank, which was placed downstream of the channel flow cell, was connected to the gas chromatograph.…”