Long-life reference electrode suitable for deep-sea high hydrostatic pressure environment

Abstract

The invention provides a long-life reference electrode suitable for a deep-sea high hydrostatic pressure environment. The reference electrode comprises a shell, which is internally provided with an inner electrode core body, a salt bridge and a diaphragm from top to bottom. The electrode is characterized in that: the salt bridge is composed of a saturated potassium chloride sol gel and potassium chloride particles that are uniformly and diffusely distributed in the saturated potassium chloride sol gel. The diaphragm is a super-microporous ceramic column. The upper end of the inner electrode core body is provided with an epoxy seal filler and is connected to an electrode lead wire that passes through the epoxy seal filler and then extends out of the shell. The lower end of the inner electrode core body contacts the upper end of the salt bridge, the lower end of which contacts one side of the super-microporous ceramic column diaphragm, and the other side of the super-microporous ceramic column diaphragm is in connection with the external environment. The invention can satisfy the electrochemical measurement requirements under a deep-sea high hydrostatic pressure environment, and can be widely applied to corrosion signal monitoring and detection, electrochemical protection, automatic control equipment probes, and the like of marine constructions, deep-sea petroleum pipelines, and deep-sea detection equipment.

Description

technical field [0001] The invention relates to a reference electrode, in particular to a long-life reference electrode which can be stably used in deep-sea high hydrostatic pressure environment. Background technique [0002] The reference electrode is used to accurately measure the electrode potential of metals and their structures in the environment, cathodic protection of metals and their structures, and can also provide potential control signals for automatic control equipment. It has a wide range of applications. At present, it is known that the reference electrode used in the marine environment generally chooses silver / silver chloride reference electrode. The basic structure of the reference electrode is made of an outer shell, an inner electrode made of chlorinated silver wire, and a salt bridge filling liquid in the electrode. and diaphragm composition. The marine environment, especially the deep sea environment, has huge hydrostatic pressure, low temperature, low d...

AI Technical Summary

Problems solved by technology

[0003] When the reference electrode is working, because silver chloride can form soluble silver chloride complex ions in a high-concentration chloride ion solution, the reaction is as follows: If this silver chloride complex ion encounters a lower concentration of chloride ion solution at the liquid junction interface of the reference electrode, its reaction is reversed to form a silver chloride precipitate, thereby blocking the liquid junction diaphragm; secondly, Due to the dilution effect of the solution in the external environment on the salt bridge solution in the reference electrode due to concentration diffusion, the inner salt bridge filling solution needs to be replaced regularly; in addition, pollutants in the marine environment may enter the electrode inner salt through the diaphragm Bridge filling liquid, and then pollute the internal electrode, so that the electrode potential of the reference electrode will shift and affect its service life

In addition, due to the liquid salt bridge in the reference electrode cavity, it is easy to cause the salt bridge filling liquid inside the reference electrode to seep or lose during the process of processing, transportation, storage and use. If the salt bridge is not found during use If the filling fluid seeps or loses and is used directly, especially in deep-sea high hydrostatic pressure environments, due to the blockage of the diaphragm and the huge external pressure, it is easy to cause deformation or fracturing of the reference electrode shell, resulting in failure of the reference electrode. Lose the function of accurately measuring the electrode potential, resulting in misjudgment and even huge economic losses

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