Thin liquid film corrosion testing device capable of controlling liquid film thickness automatically

Abstract

The invention discloses a thin liquid film corrosion testing device capable of controlling liquid film thickness automatically. An electrolytic cell is placed on an iron stand table. Micrometer calipers I and II and corresponding probes I and II are arranged on a horizontal beam above the iron stand table. A liquid storage groove is connected with the electrolytic cell through a solenoid valve. The solenoid valve supplies liquid level for the electrolytic cell. An auxiliary electrode, a reference electrode and a working electrode are connected with corresponding ports of an electrochemistry working station respectively, and an electrochemistry corrosion testing system is formed. A universal meter is connected into a loop where the micrometer caliper I and the working electrode are placed. The micrometer caliper II and a platinum electrode are connected with a wire connector of the solenoid valve respectively, and accordingly the three parts form a loop. The device can control the keep a thin liquid film to be of a certain thickness in a certain range automatically, accurately and conveniently, the thickness is convenient to adjust, electrochemistry data collecting of metal corrosion under a certain liquid film thickness is achieved, and accordingly the corrosion mechanism of metal under different film thicknesses can be well studied.

Description

technical field [0001] The invention relates to the improvement of a thin liquid film corrosion test, in particular to a thin liquid film corrosion test device capable of automatically controlling the thickness of a liquid film, and belongs to the technical field of electrochemical corrosion. Background technique [0002] Atmospheric corrosion is one of the most common corrosion phenomena of metal materials, which is extremely harmful; thin liquid film corrosion in atmospheric corrosion is an important research direction of corrosion research. A very thin water film is usually formed on the metal surface placed in the atmospheric environment. When the thickness of the water film reaches 20-30 molecules thick, the electrolyte film required for electrochemical corrosion is formed, that is, a thin liquid film. The thin liquid film often contains water-soluble corrosive electrolytes and dissolved corrosive gases, which have a great impact on metal corrosion; at the same time, ...

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Problems solved by technology

[0005] The error of the liquid film thickness measured by the traditional thin liquid film thickness measurement method is large. When the liquid film thickness is as low as ten microns or even lower, a slight change of the spiral micrometer will cause a huge change in the reading of the spiral micrometer. However, in the research on the corrosion of metals under thin liquid films, the micron-scale film thickness is the focus of thin liquid film corrosion research.

[0006] At the same time, with the progress of the corrosion reaction, the liquid level of the solution in the electrolytic cell may decrease due to volatilization, participation in the reaction, etc., resulting in a great change in the thickness of the liquid film on the surface of the working electrode, making the data measured by the electrochemical workstation inconsequential. Accuracy and reliability, low reproducibility of experimental phenomena and experimental results

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