Citation: CHENG Qing-Li, ZHANG Wei-Hua, TAO Bin. Investigation of the Electrochemical Corrosion of Copper under a Micrometric Electrolyte Droplet Using a Three-Electrode System[J]. Acta Physico-Chimica Sinica, ;2015, 31(7): 1345-1350. doi: 10.3866/PKU.WHXB201504271 shu

Investigation of the Electrochemical Corrosion of Copper under a Micrometric Electrolyte Droplet Using a Three-Electrode System

1.
China Petroleum and Chemical Corporation Qingdao Safety Engineering Institute, Qingdao 266700, Shandong Province, P. R. China

Received Date: 7 January 2015
Available Online: 27 April 2015
Fund Project: 青岛市民生计划项目(11-2-3-56-nsh)资助 (11-2-3-56-nsh)

Owing to its high impedance, studying atmospheric corrosion using a traditional reference electrode (RE) is difficult. To obtain more accurate information on the electrochemical processes involved in atmospheric corrosion, it is necessary to improve the traditional RE. In this paper, the corrosion behavior of copper under an electrolyte droplet containing (NH₄)₂SO₄ was investigated by electrochemical impedance spectroscopy (EIS) and polarization measurements using a three-electrode system with a modified RE. The average corrosion rate increased with decreasing electrolyte volumes (from 1 to 20 μL) and with decreasing heights of the droplet at heights below 850 μm. The EIS and polarization results were in agreement, thereby demonstrating that the modified RE could be effectively used to study atmospheric corrosion under an electrolyte droplet.
- Atmospheric corrosion,
- Copper,
- Electrochemical impedance spectroscopy,
- Droplet,
- Polarization curve,
- Microelectrode
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