Manganese dioxide reference electrode

Abstract

The invention belongs to the technical field of cathodic protection for corrosion and protection, and relates to a manganese dioxide reference electrode used in concrete to prevent corrosion of metal materials. The main structure includes sealing tape, concrete semi-permeable membrane, alkali-resistant tissue paper, manganese ring, Collector steel cylinder and wire, the wire is welded at one end of the collector steel cylinder, push the two manganese rings into the collector steel cylinder respectively, wrap the front end of the concrete semi-permeable membrane with alkali-resistant cotton paper and gently push it into the collector steel cylinder Inside, the alkali-resistant cotton paper is in contact with the two manganese rings, the main structure of the reference electrode is sealed with a sealing tape and one end of the concrete semi-permeable membrane is in contact with the outside to form an integrated structure of the manganese dioxide reference electrode. The structure is strong and can withstand large external pressure, etc.; the semi-permeable membrane material makes the thermal expansion and contraction coefficient of the part in contact with the concrete similar to that of the concrete, which will not cause loosening of the bond between the ceramic and the concrete, making the electrode's Potentials are much more stable in long-term performance.

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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