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

Abstract

The invention discloses a thin liquid film corrosion testing method capable of controlling the thickness of a liquid film automatically. A device adopted in the method comprises an iron support, a micrometer caliper I, a micrometer caliper II, a probe I corresponding to the micrometer caliper I, and a probe II corresponding to the micrometer caliper II. A liquid storage tank is connected with an electrolytic bath through an electromagnetic valve. Before a test is started, circuit connection is conducted firstly, and a universal meter is connected to a circuit where the micrometer caliper I and a working electrode are located; the micrometer caliper II and a platinum electrode are connected with a wiring port of the electromagnetic valve to form a circuit; then the thickness of the liquid film is set through the probe I and the probe II. When the test is conducted formally, automatic liquid replenishment can be achieved through opening and closing of the electromagnetic valve. By the adoption of the method, the thin liquid film can be controlled automatically, conveniently and accurately to be maintained at a certain thickness within a certain range, the thickness can be adjusted conveniently, metal corrosion electrochemical data acquisition at a certain liquid film thickness is achieved, and then research on metal corrosion mechanisms at different film thicknesses can be facilitated.

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 method 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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