Formation Phenomena of Zinc Dendrite on a Ceramic Insulating Surface

Cap and pin corrosion acceleration caused by surface leakage current of HVDC porcelain insulators leads to mechanical failure and electrical degradation of insulator strings. The corrosion rate changes with the development of corrosion. An experiment was designed for tracking the process of electrol...

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Bibliographic Details
Main Authors: Yang, Daiming, Yuan, Jie, Huang, Zhihuang
Format: Conference Proceeding
Language:English
Subjects:
Anodes
ceramic insulator
Corrosion
Dendrites (neurons)
Electrolytes
electrolytic corrosion
HVDC
Insulators
Iron
Porcelain
zinc dendrite
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Summary:Cap and pin corrosion acceleration caused by surface leakage current of HVDC porcelain insulators leads to mechanical failure and electrical degradation of insulator strings. The corrosion rate changes with the development of corrosion. An experiment was designed for tracking the process of electrolytic corrosion of zinc and iron on a ceramic insulating surface. A novel discovery shown the zinc dendrites would appear and grow from the cathode to anode, which increases the corrosion current sharply. Dendrites can be formed only when the anode is zinc but not iron, and the cathode metal has no influence on the formation. A thin electrolyte film and a slow flow rate promoted dendrite growth, of which the speed should be set to 0.2 mL/s~ 0.5 mL/s. Dendrites shortened the electrolyte path, decreased the resistance, and concentrated the current on the longest dendrite channel. The discovery can help to optimize the method of electrolytic corrosion test and the suppression for metal electrode electrolytic corrosion in DC system.
ISSN:2474-3852
DOI:10.1109/ICHVE53725.2022.9961648