Corrosion detection electrode in conductive concrete environment, preparation method of corrosion detection electrode in conductive concrete environment and corrosion detection method in conductive concrete environment

Abstract

The invention belongs to the field of corrosion electrochemistry testing, and particularly relates to a corrosion detection electrode in a conductive concrete environment, a preparation method of thecorrosion detection electrode in the conductive concrete environment and a corrosion detection method in the conductive concrete environment. A columnar sample, a hot inlaying layer, an epoxy resin layer, a conductive concrete layer and a wire are all included. In the preparation method, by sample sealing mode of firstly performing hot inlaying and then performing cold inlaying for a test metal, atest surface is enabled to be combined with an inlaying material tightly, a problem that a concrete work electrode is liable to generate gas corrosion in a cement accelerated curing process can be solved, a simple and convenient work electrode preparation method is provided for realizing metal material corrosion electrochemistry detection in the concrete environment, the preparation method not only is suitable for performing corrosion resistance detection for a conductive concrete composite material newly researched and developed on the market, but also can be used for research on electrochemical corrosion mechanism of the metal material in the concrete environment and evaluation on corrosion inhibition performance of an corrosion inhibitor in the internal / external environment of the concrete.

Description

technical field [0001] The invention belongs to the field of corrosion electrochemical testing, in particular 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 aggregate (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 metal materia...

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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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