Corrosion detection electrode in conductive concrete environment and preparation and detection method

Abstract

The invention belongs to the field of corrosion electrochemical testing, and in particular relates to a corrosion detection electrode in a conductive concrete environment and a preparation and detection method, including a columnar sample, a thermal mosaic layer, an epoxy resin layer, a conductive concrete layer and a wire. The method of sealing the test metal by hot mounting first and then cold mounting makes the test surface and the mounting material tightly combined, which solves the problem that the concrete working electrode is prone to crevice corrosion during the accelerated cement curing process. The test provides a simple method for preparing the working electrode, which is not only suitable for testing the corrosion resistance of newly developed conductive concrete composite materials on the market, but also for the research on the electrochemical corrosion mechanism of metal materials in the concrete environment and the internal / external corrosion resistance of concrete. Evaluation of corrosion inhibition performance of corrosion inhibitors in the environment.

Description

technical field [0001] The invention belongs to the field of corrosion electrochemical testing, and in particular relates to a corrosion detection electrode in a conductive concrete environment and a preparation and detection method. Background technique [0002] Conductive concrete is a coated resistance-reducing material composed of cement, conductive aggregates (such as coke, graphite, and carbon fiber, etc.) and water. Widely used in industrial anti-static, power industry disaster prevention and mitigation, power grounding modules, intelligent buildings and other fields. The addition of conductive particles significantly improves the conductivity of concrete, but it also promotes the electrochemical corrosion process of metal materials in concrete, resulting in varying degrees of corrosion or even rusting after a certain service life. Therefore, for the development and use of new conductive concrete, the corrosion resistance detection and corrosion mechanism analysis of...

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Problems solved by technology

[0004] At present, the electrochemical test and mechanism research in the concrete environment are mainly carried out in the following ways: (1) The test metal material is sealed with epoxy resin to prepare a working electrode, and placed in the simulated pore fluid of concrete for electrochemical test. Due to the particularity of the physical and chemical properties of concrete structures, the corrosion data obtained in the concrete pore simulation solution are often quite different from the actual corrosion conditions, making it difficult to accurately study the corrosion mechanism of materials in concrete environments

(2) Place the working electrode, auxiliary electrode and reference electrode of the electrochemical test inside the concrete test block for electrochemical test. The disadvantage of this method is that it is difficult to take out the electrodes after the concrete is cured, and the test electrodes cannot be reused. And in the same batch of tests, the deviation of the placement position of the three electrodes will lead to differences in the test results, and the data comparability is poor

At the same time, because the preparation of conductive concrete specimens requires a certain period of accelerated curing tests, if the traditional method of adding curing agent to epoxy resin is used to seal the test materials, due to the high brittleness of epoxy resin, the accelerated curing process It is easy to produce gaps that are difficult to detect with the naked eye at the resin / metal interface, which will lead to electrolyte penetration and crevice corrosion, which will affect the test results

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