A thin liquid film corrosion test method with automatic control of liquid film thickness

Abstract

The invention discloses a thin liquid film corrosion test method that can automatically control the thickness of the liquid film. The device used in the method includes an iron stand, spiral micrometers I and II and corresponding probes I and II, and the liquid storage tank is connected to an electromagnetic The valve is connected to the electrolyzer. Before the test, connect the line first, connect the multimeter to the circuit where the screw micrometer Ⅰ and the working electrode are; Needle Ⅰ and Ⅱ set the thickness of the liquid film; when the official measurement is made, the liquid level can be automatically replenished by turning on and off the solenoid valve. The method can automatically, conveniently and accurately control and keep the thin liquid film at a certain thickness within a certain range, and the thickness can be adjusted conveniently, so as to realize the electrochemical data collection of metal corrosion under a certain liquid film thickness, which is more conducive to research in Corrosion mechanism of metals under different film thicknesses.

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, th...

AI Technical Summary

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

Images