Interface corrosion electrochemical measurement system and method for realizing interface stripping

Abstract

The invention provides an interface corrosion measurement system and method which are used for constructing a stable gas-liquid phase interface by utilizing a bubbling method and achieving real physical stripping. An interface corrosion electrochemical measurement system is established, and the positions of three-phase lines of bubbles, the sizes of a thin liquid film area and an interface corrosion influence areaaccurately measuredthrough high-speed camera shooting and corrosion product component analysis; the corrosion current difference under the interface / non-interface condition is calculated on the basis of considering the corrosion area by measuring the corrosion current of the interface / non-interface sample under the same condition, so that the real stripping research of interface corrosion is achieved; meanwhile, the correlation between the interface corrosion current and the thin liquid film area and the interface corrosion influence area is obtained. The interface corrosion electrochemical measurement platform mainly comprises a bubble generation part, an electrochemical measurement part, a liquid storage cavity and a high-speed camera system.

Description

technical field [0001] The invention belongs to the technical field of interfacial corrosion, and specifically relates to an electrochemical measurement system and a measurement method for interfacial corrosion by adopting a bubbling method to accurately control the position of a phase interface and accurately peel off the interface. Background technique [0002] Interfacial corrosion refers to the corrosion of the three-phase line area caused by the interface characteristics when the metal surface contacts with the gas-liquid phase interface to form a gas-liquid-solid three-phase line. This corrosion is also called waterline corrosion. In some special occasions, such as drilling platform supports, nuclear waste storage, and ships or offshore floating metal components, which are in contact with the gas-liquid phase interface for a long time, severe interface corrosion will occur, leading to accidents such as platform collapse and nuclear waste leakage. Therefore, a large num...

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Problems solved by technology

The interfacial corrosion rates measured in the experiment all include the homogeneous corrosion component under the immersion area of ​​the liquid phase body with a large or small size; at the same time, the stability and accuracy of the phase interface of the three methods are insufficiently controlled, and the interface position cannot be accurately measured , the size of the thin liquid film area and the size of the area affected by interfacial corrosion, it is even more impossible to measure the interfacial corrosion rate of physical interface peeling

Therefore, the current experimental research methods cannot really realize the peeling and measurement of local physical interfacial corrosion, the depth mechanism of interfacial corrosion is still far away, and the real interfacial corrosion theory has not yet been established.

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