Electrochemically deposited manganese dioxide reference electrode of and preparation method thereof

Abstract

The invention discloses an electrochemically deposited manganese dioxide reference electrode which comprises a manganese dioxide-deposited electrode core, a buffer internal reference solution, a mortar permeable layer and an electrode sleeve from inside to outside, wherein the electrode coat is provided with an inner cavity and two tail ends, the first tail end is sealed by the mortar permeable layer, the buffer inner-reference solution is filled in the inner cavity, one end of the manganese dioxide-deposited electrode core is submerged in the buffer inner-reference solution, and the other end connected with a wire exposes out of the liquid level, is fixed in the cavity between the liquid level and the second tail end of the electrode coat by alkali-resisting epoxy materials by alkali-resisting epoxy materials in a sealing way. The embedded manganese dioxide reference electrode manufactured by using the electrochemical deposition method can unify the test conditions relatively simply, and the obtained electrode has good reproducibility, stable electric potential, simple preparing operation and relatively lower cost.

Description

technical field [0001] The invention relates to an electrochemical measurement system used in the measurement of atmospheric erosion, corrosion or anticorrosion, in particular to the technical field of manufacturing reference electrodes for health monitoring of marine concrete structures. Background technique [0002] At present, the embedded reference electrodes commonly used in the health monitoring of marine concrete structures include calomel electrodes, silver / silver chloride electrodes, mixed metal oxide electrodes, and Mo / MoO electrodes. 3 Reference electrode, copper / copper sulfate electrode, lead electrode, graphite electrode, manganese dioxide reference electrode, etc. Among them, calomel electrode, silver / silver chloride electrode and copper / copper sulfate electrode, even if the structure of the electrode is improved, when embedded in the marine concrete structure (it is often inevitable that a certain amount of chlorine will infiltrate or diffuse into the concrete...

AI Technical Summary

Problems solved by technology

Among them, calomel electrode, silver / silver chloride electrode and copper / copper sulfate electrode, even if the structure of the electrode is improved, when embedded in the marine concrete structure (it is often inevitable that a certain amount of chlorine will infiltrate or diffuse into the concrete from seawater). ions), due to its unavoidable use of KCl or CuSO 4 As an internal reference liquid, on the one hand, the reference liquid needs to be replenished frequently; on the other hand, the penetration of the reference liquid into the concrete structure will also cause pollution to the latter

However, the cost of the mixed metal oxide electrode is high and its electrode potential is greatly affected by the pH value of the outside world, so it is not suitable for long-term monitoring embedded in concrete structures.

The potential reproducibility of lead and carbon reference electrodes is poor, and the potential of the latter is greatly affected by the oxygen content and pH in the concrete, generally changing within -40 ~ -150mV

The reference electrode successfully applied in concrete is ERE20 produced by Force Company of the United States, that is, MnO 2 The reference electrode, which is embedded in concrete, has good long-term stability, polarization resistance, and good reproducibility, but because its preparation method adopts a powder solidification process, the requirements for raw materials are relatively high, and the preparation of high-purity manganese dioxide is relatively Difficulty, and the diversity of manganese dioxide crystal forms, resulting in the preparation of this type of powder solidified manganese dioxide electrode is troublesome and expensive

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