Double-electrolytic tank for simulating under-deposit corrosion and application

Abstract

The invention discloses a testing technology for electrochemical parameters of under-deposit corrosion and a special primary and secondary matched double-electrolytic tank thereof. The electrolytic tank device comprises an organic glass double-electrolytic tank body, a working electrode, auxiliary electrodes, reference electrodes and an ion diffusion passage. The organic glass double-electrolytic tank body consists of an outer electrolytic tank and an inner electrolytic tank, wherein the outer electrolytic tank is an open system which is provided with a vent and used for measuring a body solution anode region, and the inner electrolytic tank is a closed device for measuring a cathode region in a closed micro-environment under a deposit layer. The working electrode, the auxiliary electrodes and the reference electrodes are fixed through rubber plugs on top covers of the electrolytic tanks and used for measuring the electrochemical parameters. The ion diffusion passage is an organic glass passage for connecting the inner electrolytic tank with the outer electrolytic tank, is filled with a corrosive deposit layer for simulating a real deposit layer environment and realizing exchange of internal and external ions of the deposit layer, and is fixed through a bolt plug. The electrolytic tank is used for measuring the various electrochemical parameters of the under-deposit corrosion conveniently, and can be used for accurately simulating the internal and external corrosive environments of the deposit layer and obtaining the information and dynamic changes of an under-deposit corrosion process.

Description

Technical field [0001] The invention relates to a dual electrolytic cell for simulating corrosion under scale and its application. It is used to study the changes in chemical composition and electrochemical behavior of the occluded area under the scale layer, which is convenient for investigating when different scale layers are in different corrosion media or adsorb different ions The change of physicochemical properties and its influence on the occluded micro-area also facilitates the study of the local corrosion tendency of different materials. Background technique [0002] Dirt covering the metal surface will cause corrosion under the scale, and the corrosion products will form dirt. The two promote each other and bring great harm to the safe operation of the system. Once dirt is formed on the heat transfer surface, it will greatly reduce its heat transfer efficiency, increase flow resistance, and cause energy loss and waste. Once corrosion occurs, it will cause heat exchanger...

AI Technical Summary

Problems solved by technology

However, these studies were all carried out under the artificially applied large anode polarization, without considering the relationship between the driving force of the internal and external coupling current of the blocked battery and the medium environment, and without considering the influence of the nature of the scaling layer itself on the blocked area under the membrane, it is difficult to obtain a true reflection Electrochemical information of the autocatalytic process in the subscale occlusion zone to study subscale corrosion with large defects

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