A Device for Monitoring Metal Corrosion in Different Cement Accidents

Abstract

The invention discloses a device for monitoring metal corrosion in different cement accidents. The device includes: a multi-channel electrode, a reference electrode, an auxiliary electrode, a first electronic multi-way switch, a variable resistor, a zero-resistance ammeter, a sampling Resistor, potential follower, A / D converter, MCU controller, second electronic multiplexer, electrochemical workstation, computer. The device can not only measure the corrosion current and corrosion potential of electrodes in different cement accident areas, judge the anode area and cathode area and the change of corrosion, but also carry out electrochemical tests such as electrochemical impedance and linear polarization for specific electrodes. It is more convenient to study the corrosion process and corrosion mechanism, and provides an effective research method.

Description

technical field [0001] The invention relates to the field of corrosion, in particular to a device for monitoring metal corrosion in different cement accidents. Background technique [0002] Cement is a highly alkaline environment (pH value around 13), and the metal forms a passive film on the surface in this environment, so its corrosion rate is very slow. However, when accidents such as cracks, interlayers, and shedding of cement occur due to human or natural factors, the corrosion rate of metal will be significantly accelerated. The current methods for monitoring the corrosion of metals in cement can be divided into two categories, namely electrochemical methods and physical methods. [0003] Electrochemical methods mainly include: half-cell potential measurement, polarization measurement, electrochemical noise, electrochemical impedance spectroscopy, local electrochemical impedance spectroscopy, constant current pulse, and scanning reference electrode. Physical methods ...

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Problems solved by technology

[0004] However, the current monitoring of metal corrosion in different states of cement is limited to the study of the corrosion of a single electrode in a specific state of cement, and it is impossible to determine the location of localized corrosion, nor to study the real-time potential and current at different locations. Corrosion information, these research methods cannot represent the dynamic corrosion information in actual conditions, and at the same time, the actual situation that the metal is covered by both intact cement and accidental cement is not considered. Based on the above problems, the present invention proposes a method for monitoring metal Devices Corroded in Different Cement Accidents

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