The lamella

as a key element of electrical connection structure in high-voltage bushing

the contacts degradation is affected by the combined action of electricity

heat and chemistry. At present

the key factors affecting the deterioration of the lamella are unclear and relevant research is urgently needed. In this paper

a research on the high temperature corrosion characteristics of the lamella is performed based on the lamella deterioration test system. Firstly

the reaction tendency of different metal materials to the decomposition products of SF

6

gas is analyzed based on thermodynamics. Meanwhile

the corrosion test of the lamella at high temperature in SF

6

is carried out

and the corrosion characteristics of the lamella under different superheated decomposition conditions is obtained. It is found by the research that the type of corrosion reaction of the lamella mainly depends on the position of the highest temperature point and the magnitude of thermal decomposition of SF

6

gas. The characteristic peak of fluoride in the early stage of thermal decomposition of SF

6

is stronger. When the temperature of the lamella is higher than the surrounding temperature and the SF

6

decomposition degree is low

the lamella is mainly corroded by fluoride. In case of high SF

6

decomposition

the lamella is mainly corroded by sulfur. The related research can provide a practical basis for the overheating fault analysis and reliable operation of the contact structure of high voltage bushing.