Manganese dioxide reference electrode

Abstract

The present invention belongs to the technical field of cathode corrosion prevention and relates to a manganese dioxide reference electrode applied to concrete for preventing corrosion of metal material. A body structure comprises a sealing adhesive tape, a concrete semi-permeable membrane, a piece of alkali-resistant tissue paper, manganese rings, a steel current collector cylinder and a wire, wherein the wire is welded to one end of the steel current collector cylinder; two manganese rings are respectively thrust into the steel current collector cylinder; the concrete semi-permeable membrane is winded by the alkali-resistant paper by the front end and then tenderly thrust into the steel current collector cylinder; the alkali-resistant paper contacts with the two manganese rings; the body structure of the reference electrode is sealed with the sealing adhesive tape and one end of the concrete semi-permeable membrane is made to contact with the outside, thereby an integral manganese dioxide reference electrode, which has a firm structure and can bear fairly large external stresses, is formed. Due to the semi-permeable membrane, the part of the electrode touching the concrete has similar thermal expansion coefficient with the concrete, so the electrode, unlike ceramics, has no integration loose problem between the concrete and has much more stable potential in long-term use.

Description

Technical field: [0001] The invention belongs to the technical field of cathodic protection for corrosion and protection, in particular to a manganese dioxide reference electrode used in concrete to prevent corrosion of metal materials. Background technique: [0002] Reinforced concrete occupies a considerable proportion in the infrastructure of all countries in the world, such as reinforced concrete piers, pile foundations, bridges, hydraulic gates, prestressed concrete pipelines, highways, etc. The use status of these facilities is directly related to safe production and national investment benefits, so it is necessary to ensure that these facilities are in safe use and prolong their effective service life. However, the premature failure of concrete structures caused by the corrosion of steel bars has become a major disaster that is widely concerned and increasingly prominent all over the world. Therefore, it is necessary to monitor and evaluate the corrosion state of ste...

AI Technical Summary

Problems solved by technology

However, such electrodes generally have outstanding shortcomings such as complex preparation process, unreasonable structure, high cost, poor drying resistance, and unstable temperature coefficient.

[0003] In concrete, no matter how good the impermeability of the semi-permeable membrane is, the solution in the final environment will still penetrate into the electrode. Because the silver chloride of the silver chloride electrode is unstable under the condition of alkaline change, it is easy to form Ag. 2 O, which leads to the unpredictability of the electrode potential; the copper sulfate reference electrode also has this corresponding problem, once the environmental solution reverses, it will generate Cu(OH) 2

Concrete is mostly used in extremely dry environments, and common electrodes have electrolyte leakage, which makes the electrodes unusable, and the drying resistance of these two electrodes is very poor

On the other hand, since the concrete itself needs to undergo frequent cycles of drying and wetting, thermal expansion and contraction, the semipermeable membrane of the embedded reference electrode is prone to cracks with the concrete structure

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