An electrochemical test device for determining vapor phase corrosion inhibitors in marine atmospheric environment

Abstract

The present invention relates to the technical field of electrochemical testing devices, and in particular, to an electrochemical testing device for measuring vapor phase corrosion inhibitors in a marine atmosphere environment, comprising a transparent observation cover, a transparent cover plate hingedly connected to the top surface of the transparent observation cover by a hinge, a corrosion inhibitor electrochemical testing assembly arranged in a testing chamber, a heat conducting plate fixedly installed at the bottom of the transparent observation cover, a base fixedly installed at the bottom of the heat conducting plate, a heating rod fixedly installed on the inner wall of the base, a glycerin adding device arranged on the transparent observation cover, the glycerin adding device comprising a micrometering pump arranged on one side of the transparent observation cover, an oil outlet pipe fixedly installed on the oil outlet end pipe body of the micrometering pump, and the corrosion inhibitor electrochemical testing assembly comprising a storage cylinder placed in the testing chamber. The present invention is conducive to simulating a marine environment, and the test result has higher accuracy, which is conducive to ensuring the accuracy of data.

Description

Technical Field

[0001] The invention relates to the technical field of electrochemical testing devices, in particular to an electrochemical testing device for measuring gas phase corrosion inhibitors in a marine atmospheric environment. Background Art

[0002] In an electrochemical system, when an external current passes through an electrode, the phenomenon that the electrode potential deviates from the equilibrium electrode potential is called electrode polarization; in the electrode reaction caused by electrode polarization, the curve of the relationship between the electrode potential and the current density is called the polarization curve, and its measurement and research are important contents of electrode reaction kinetics. The research on polarization curves has been widely studied in the fields of metal corrosion protection and environmental adaptability of materials;

[0003] Under normal conditions, the polarization curve is measured using a three-electrode system, including a working electrode (WE) formed with the metal sample to be measured, an auxiliary electrode (CE) that forms a loop with the working electrode to form a polarization to the research electrode, and a reference electrode (RE) that serves as a comparison standard for measuring and researching potentials.

[0004] The application of three-electrode system and polarization curve measurement technology is of great significance for metal corrosion protection experiments. Electrochemical tests are performed on metals under thin liquid layers to study the laws of atmospheric corrosion and further evaluate the protective effect of vapor phase corrosion inhibitors on metals under humid and wet atmospheres.

[0005] The utility model patent with the authorization announcement number CN216900143U discloses a gas phase corrosion inhibitor film formation and corrosion experiment device, which includes a sample, a wide-mouth bottle, a reagent container, an electrochemical workstation, a computer, an exhaust gas treatment tank and a gas cylinder. The sample is placed in the gas phase area through a hook and connected to the electrochemical workstation through a wire;

[0006] The utility model patent with the authorization announcement number CN206945511U discloses an electrochemical experimental device for evaluating the performance of gas phase corrosion inhibitors, which belongs to the technical field of metal corrosion inhibition. It includes a closed container, an ACM electrode, a reagent holding dish, an electrochemical workstation, a computer, an exhaust gas treatment tank and a gas cylinder. The ACM electrode is formed by stacking a number of corroded steel sheets in sequence, and adjacent corroded steel sheets are separated by insulating sheets. The odd-numbered corroded steel sheets and the even-numbered corroded steel sheets are welded together and sealed with epoxy resin as a whole; the bracket places the ACM electrode into the gas phase zone in the closed container, and the corrosive medium solution is introduced into the closed container through the reagent holding dish. The utility model device can simulate variable temperature, gas dissolution and general experimental conditions, and can calculate the corrosion inhibition efficiency of the corrosion inhibitor by electrochemical methods such as potentiodynamic polarization method and AC impedance method;

[0007] Although the above technical solution has the advantages of simple structure, convenient operation, fast test speed, accurate and reliable data, and can be applied to the effect evaluation of gas phase corrosion inhibitors, when the technical solution is used in specific use, when using a conventional three-electrode system for test operation, due to the large spacing between the working electrode (WE), auxiliary electrode (CE) and reference electrode (RE), the solution resistance between the three electrodes will affect the determination of the polarization curve, distort the test results, affect the accuracy of the data, and bring inconvenience to the user. In view of this, we propose an electrochemical test device for determining gas phase corrosion inhibitors in marine atmospheric environment. Summary of the invention

[0008] The purpose of the present invention is to provide an electrochemical testing device for measuring vapor-phase corrosion inhibitors in a marine atmospheric environment, so as to solve the defect that when the conventional electrochemical testing device proposed in the above background technology is used, the solution resistance between the three electrodes will affect the measurement of the polarization curve, distort the test results, and affect the accuracy of the data.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] An electrochemical testing device for measuring vapor phase corrosion inhibitors in a marine atmosphere environment comprises a transparent observation cover, a transparent cover plate is hingedly connected to the top surface of the transparent observation cover by a hinge, a test chamber is arranged inside the transparent observation cover, and a corrosion inhibitor electrochemical testing component for testing the metal protection effect of the vapor phase corrosion inhibitor under humid atmosphere and wet atmosphere conditions is arranged inside the test chamber.

[0011] As a preferred embodiment of the present invention, a heat conducting plate is fixedly installed at the bottom of the transparent observation cover, a base is fixedly installed at the bottom of the heat conducting plate, and a plurality of heating rods arranged at equal intervals are fixedly installed on the inner wall of the base. The heating rods are used to perform heating operations on the transparent observation cover, so as to facilitate the use of the heating rods to increase the temperature in the test chamber.

[0012] As a preferred embodiment of the present invention, a thermometer and hygrometer for measuring temperature and humidity is fixedly installed on the cavity wall of the test cavity, so as to facilitate measuring the temperature and humidity in the test cavity by using the thermometer and hygrometer.

[0013] As a preferred embodiment of the present invention, a sealing gasket is fixedly installed on the surface of the transparent cover plate, and the sealing gasket can improve the sealing effect between the transparent cover plates.

[0014] As a preferred embodiment of the present invention, the top surface of the transparent observation cover and the transparent cover are both inclined downward by 30 to 60 degrees, so that water vapor adheres to the transparent cover to form water droplets and can continue to drip into the test chamber along the bottom surface of the transparent cover.

[0015] As a preferred embodiment of the present invention, a glycerin adding device is provided on the transparent observation cover, and the glycerin adding device includes a micro-metering pump arranged on one side of the transparent observation cover, an oil outlet pipe is fixedly installed on the oil outlet end tube body of the micro-metering pump, the end of the oil outlet pipe is fixedly installed on the transparent observation cover and is connected with the interior of the test chamber, an oil inlet pipe is fixedly installed on the oil inlet end tube body of the micro-metering pump, and a storage tank is fixedly installed on the end of the oil inlet pipe, and a top cover is hinged on the top surface of the storage tank by a hinge, so as to facilitate the operation of the micro-metering pump to add glycerin into the test chamber and control the humidity in the test chamber by glycerin.

[0016] As a preferred embodiment of the present invention, the corrosion inhibitor electrochemical test assembly includes a storage cylinder placed in the test chamber, a sealing cover is provided at the top of the storage cylinder, a working electrode composed of the metal amount to be measured and an auxiliary electrode forming a loop with the working electrode and used to form polarization of the research electrode are fixedly installed on the top surface of the sealing cover, a reference electrode serving as a standard for measuring and researching potential comparison is fixedly installed on the storage cylinder, a center hole connected to the inside of the storage cylinder is fixedly installed on the top surface of the sealing cover, a saturated KCl solution is stored in the storage cylinder, a saturated KCl gel salt bridge is provided in the center hole, the distance between the working electrode and the auxiliary electrode and the reference electrode is between 0.3 mm and 0.6 mm, so that when in use, the working electrode and the auxiliary electrode are connected through the thin liquid layer formed on the surface of the working electrode and the auxiliary electrode to form a closed loop, saturated KCl gel is filled in the center hole for use as a salt bridge, and the thin liquid layer on the working surface of the working electrode can be connected with the reference electrode to form a connecting loop of thin liquid layer-KCl gel salt bridge-saturated KCl solution-reference electrode to perform electrochemical test operations.

[0017] As a preferred embodiment of the present invention, a thin liquid layer thickness measuring component for measuring the thickness of the thin liquid layer generated on the surface of the working electrode is fixedly installed on the cavity wall of the test chamber, and the thin liquid layer thickness measuring component includes a micrometer, and a platinum wire probe is fixedly installed on the micrometer, so that when in use, the working electrode is connected to the platinum wire probe on the micrometer and an external multimeter through a wire to form a loop. When a thin liquid layer is formed on the surface of the working electrode, the platinum wire probe is detached from the thin liquid layer on the surface of the working electrode by rotating the micrometer scale, and the multimeter reading is observed at the same time. When the platinum wire probe does not contact the thin liquid layer on the surface of the working electrode, an open circuit is formed, and the micrometer reading is recorded as the thickness of the produced thin liquid layer.

[0018] As a preferred embodiment of the present invention, the thin liquid layer thickness measurement assembly also includes a support plate fixedly mounted on the wall of the test chamber, an electric push rod is fixedly mounted on the bottom surface of the support plate, a rectangular plate is fixedly mounted on the end of the telescopic shaft of the electric push rod, and the micrometer is fixedly mounted on the rectangular plate by fastening screws, so that it is convenient to use the support plate and the electric push rod to support the micrometer, and it is also convenient to use the electric push rod to adjust the height of the micrometer and the platinum wire probe on the micrometer when needed.

[0019] As a preferred embodiment of the present invention, the platinum wire probe is located directly above the working electrode, which facilitates the platinum wire probe to contact the thin liquid layer on the surface of the working electrode downward to perform measurement operations.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention sets the distance between the auxiliary electrode, the working electrode and the reference electrode to be between 0.3 mm and 0.6 mm, so that the auxiliary electrode, the working electrode and the reference electrode are close to each other. When in use, the influence of the solution resistance can be ignored, so that the results of the test operation using the auxiliary electrode, the working electrode and the reference electrode are more accurate, the precision is higher, and the use is convenient. This solves the problem that when a conventional three-electrode system is used for test operation, due to the large spacing between the working electrode, the auxiliary electrode and the reference electrode, the solution resistance between the three electrodes will affect the determination of the polarization curve, distort the test results, affect the accuracy of the data, and bring inconvenience to the user.

[0022] 2. The present invention provides a thin liquid layer thickness measuring assembly to ensure that when in use, a micrometer, a platinum wire probe and a multimeter can be used to measure the thickness of the thin liquid layer formed on the surface of the working electrode, without the need to manually control the thickness of the thin liquid layer and perform the measurement, thereby facilitating use.

[0023] 3. The present invention provides a glycerin adding device to facilitate adding glycerin into the test chamber to control the humidity in the test chamber. In addition, the heating rod can control the temperature in the test chamber to simulate marine atmospheric corrosion in different marine atmospheric environments, providing a basis for its mechanism research and facilitating use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the explosion structure of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the corrosion inhibitor electrochemical test assembly of the present invention;

[0027] Figure 4It is a schematic structural diagram of a thin liquid layer thickness measuring assembly of the present invention;

[0028] Figure 5 It is a cross-sectional view of the corrosion inhibitor electrochemical test assembly of the present invention.

[0029] The meaning of each number in the figure is:

[0030] 1. Transparent observation cover; 10. Test chamber; 11. Heat conducting plate; 12. Base; 121. Heating rod; 13. Thermo-hygrometer; 14. Transparent cover; 141. Sealing pad;

[0031] 2. Glycerin adding device; 20. Micro metering pump; 21. Oil outlet pipe; 22. Oil inlet pipe; 23. Storage tank; 24. Top cover;

[0032] 3. Corrosion inhibitor electrochemical test assembly; 30. Storage tube; 31. Sealing cover; 32. Auxiliary electrode; 33. Working electrode; 34. Center hole; 35. Reference electrode;

[0033] 4. Thin liquid layer thickness measuring assembly; 40. Support plate; 41. Electric push rod; 411. Rectangular plate; 42. Micrometer; 43. Platinum wire probe. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 5 The present invention provides a technical solution: an electrochemical test device for measuring vapor phase corrosion inhibitors in a marine atmospheric environment, comprising a transparent observation cover 1, a transparent cover plate 14 is hingedly connected to the top surface of the transparent observation cover 1 by a hinge, and the transparent observation cover 1 and the transparent cover plate 14 are both made of transparent materials, which facilitates observation and operation of the inside of the transparent observation cover 1 from the outside;

[0036] Specifically, a test chamber 10 is provided inside the transparent observation cover 1, and a corrosion inhibitor electrochemical test assembly 3 for testing the metal protection effect of the vapor-phase corrosion inhibitor under humid atmosphere and wet atmosphere is provided inside the test chamber 10. The corrosion inhibitor electrochemical test assembly 3 includes a storage tube 30 placed in the test chamber 10, and a sealing cover 31 is threadedly connected to the top cylinder of the storage tube 30. A working electrode 33 composed of a metal sample to be measured and an auxiliary electrode 32 that forms a loop with the working electrode 33 and is used to form polarization of the research electrode are fixedly installed on the top surface of the sealing cover 31. A reference electrode 35 serving as a standard for measuring and researching potential comparison is fixedly installed on the storage tube 30. A center hole 34 connected to the interior of the storage tube 30 is fixedly installed on the top surface of the sealing cover 31. A saturated KCl solution is stored in the storage tube 30, and a saturated KCl gel salt bridge, the distance between the working electrode 33 and the auxiliary electrode 32 and the reference electrode 35 is between 0.3mm and 0.6mm, so that when in use, the working electrode 33 and the auxiliary electrode 32 are connected through the thin liquid layer formed on the surface of the working electrode 33 and the auxiliary electrode 32 to form a closed loop, and saturated KCl gel is filled in the central hole 34 to be used as a salt bridge, so that the thin liquid layer on the working surface of the working electrode 33 can be connected with the reference electrode 35 to form a connecting loop of thin liquid layer-KCl gel salt bridge-saturated KCl solution-reference electrode 35, and electrochemical test operations are performed. Since the distance between the working electrode 33 and the auxiliary electrode 32 and the reference electrode 35 is between 0.3mm and 0.6mm, the distance is relatively close, and the influence of solution resistance on the determination of polarization curves can be ignored, which is conducive to ensuring test accuracy and convenient use.

[0037] In this embodiment, a heat conducting plate 11 is fixedly installed at the bottom of the transparent observation cover 1. The heat conducting plate 11 is made of a heat conducting steel plate. A base 12 is fixedly installed at the bottom of the heat conducting plate 11. A plurality of heating rods 121 arranged at equal intervals are fixedly installed on the inner wall of the base 12. The heating rod 121 is used to perform heating operations on the inside of the transparent observation cover 1, so that the heating rod 121 can be used to increase the temperature in the test chamber 10. The heating rod 121 is a temperature-controlled electric heating rod. The temperature-controlled electric heating rod can control the temperature, which is conducive to timely regulating the temperature in the test chamber 10. The temperature-controlled electric heating rod is an existing conventional technology and will not be described here.

[0038] Specifically, a thermometer and hygrometer 13 for measuring temperature and humidity is fixedly installed on the wall of the test chamber 10, so that the temperature and humidity in the test chamber 10 can be measured by using the thermometer and hygrometer 13. The thermometer and hygrometer 13 is an existing conventional technology and will not be described in detail here.

[0039] Furthermore, a sealing gasket 141 is fixedly installed on the surface of the transparent cover 14. After the transparent cover 14 is closed, the sealing gasket 141 is pressed against the top surface of the transparent observation cover 1. The sealing gasket 141 can improve the sealing effect between the transparent cover 14 and the transparent cover 14.

[0040] In addition, the top surface of the transparent observation cover 1 and the transparent cover plate 14 are both tilted downward by 30 to 60 degrees, so that water vapor adheres to the transparent cover plate 14 to form water droplets, which can continue to drip along the bottom surface of the transparent cover plate 14 into the test chamber 10.

[0041] It is worth mentioning that a glycerin adding device 2 is provided on the transparent observation cover 1, and the glycerin adding device 2 includes a micro-metering pump 20 arranged on one side of the transparent observation cover 1, an oil outlet pipe 21 is fixedly installed on the oil outlet end tube body of the micro-metering pump 20, the end of the oil outlet pipe 21 is fixedly installed on the transparent observation cover 1 and is connected with the inside of the test chamber 10, an oil inlet pipe 22 is fixedly installed on the oil inlet end tube body of the micro-metering pump 20, and a storage tank 23 is fixedly installed on the end of the oil inlet pipe 22, and a top cover 24 is hinged on the top surface of the storage tank 23 by a hinge, so as to facilitate the operation of the micro-metering pump 20 to add glycerin into the test chamber 10. Since glycerin can absorb moisture from the air, it is beneficial to use glycerin to control the humidity in the air in the test chamber 10.

[0042] In this embodiment, a thin liquid layer thickness measuring assembly 4 for measuring the thickness of the thin liquid layer generated on the surface of the working electrode 33 is fixedly installed on the cavity wall of the test chamber 10. The thin liquid layer thickness measuring assembly 4 includes a micrometer 42. A platinum wire probe 43 is integrally formed on the scale body of the micrometer 42. When in use, the working electrode 33 is connected to the platinum wire probe 43 on the micrometer 42 through a wire and a multimeter is added to form a circuit. When a thin liquid layer is formed on the surface of the working electrode 33, the platinum wire probe 43 is separated from the thin liquid layer on the surface of the working electrode 33 by rotating the micrometer scale, and the multimeter reading is observed at the same time. When the platinum wire probe 43 does not contact the thin liquid layer on the surface of the working electrode 33, an open circuit is formed. The reading of the micrometer 42 is recorded as the thickness of the produced thin liquid layer.

[0043] Specifically, the thin liquid layer thickness measurement assembly 4 also includes a support plate 40 fixedly mounted on the wall of the test chamber 10, an electric push rod 41 is fixedly mounted on the bottom surface of the support plate 40, a rectangular plate 411 is fixedly mounted on the end of the telescopic shaft of the electric push rod 41, and a micrometer 42 is fixedly mounted on the rectangular plate 411 by fastening screws, so that it is convenient to use the support plate 40 and the electric push rod 41 to support the micrometer 42, and it is also convenient to use the electric push rod 41 to adjust the height of the micrometer 42 and the platinum wire probe 43 on the micrometer 42 when necessary; the platinum wire probe 43 is located directly above the working electrode 33, which is conducive to the platinum wire probe 43 to contact the thin liquid layer on the surface of the working electrode 33 downward for measurement operations.

[0044] It is worth noting that the micro metering pump 20 in this embodiment is an existing conventional technology and will not be described in detail here.

[0045] Finally, it should be noted that the working electrode 33, auxiliary electrode 32, reference electrode 35 and other components of the present invention are all universal standard parts or components known to technical personnel in this field, and their structures and principles are all known to technical personnel through technical manuals or through conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and compatible controllers and power supplies, are connected through wires. The specific connection means should refer to the working principle of the present invention. The electrical connections between the electrical components are completed in a sequential working order, and the detailed connection means are all well-known technologies in the field.

[0046] When the electrochemical test device for measuring the vapor phase corrosion inhibitor under the marine atmosphere environment of the present invention is used, firstly, a proper amount of seawater and vapor phase corrosion inhibitor are added into the test chamber 10, then the corrosion inhibitor electrochemical test assembly 3 is placed in the test chamber 10, and saturated KCl gel is added into the central hole 34 to be used as a salt bridge, and then the transparent cover plate 14 is covered, and then the specific temperature and humidity in the test chamber 10 are understood according to the numbers displayed on the thermometer and hygrometer 13. When the temperature is not enough, the heating rod 121 can be connected to an external power supply and made to work, and the heating rod 121 is used to work to achieve the temperature increase operation in the test chamber 10. When the humidity is high, the micro metering pump 20 can be connected to an external power supply and made to work, and the micro metering pump 20 works to realize the glycerin in the storage tank 23 is transported to the test chamber 10. Since glycerin can absorb moisture from the air, glycerin can be used to control the humidity in the air in the test chamber 10, so that the temperature and humidity in the test chamber 10 can meet the requirements;

[0047] As the vapor-phase corrosion inhibitor in the test chamber 10 volatilizes, the volatilized corrosion inhibitor molecules in the test chamber 10 will adhere to the metal surface to protect the metal from corrosion. In the closed environment of the entire test chamber 10, the corrosion inhibitor molecules and seawater vapor fill the entire test environment, and a thin liquid layer with vapor-phase corrosion inhibitor molecules can be uniformly formed on the surface of the working electrode 33.

[0048] Then, the test operation is performed, and the operation steps are as follows: first, the working electrode 33 is connected to the working electrode input terminal W of the external constant potential meter through a wire, the auxiliary electrode 32 is connected to the input terminal C of the external constant potential meter through a bottom wire, and then the reference electrode 35 is connected to the input terminal R of the external reference electrode through a wire. Since the storage cylinder 30 contains a saturated KCl solution and the working electrode 33 and the auxiliary electrode 32 are close to each other, the working electrode 33 and the auxiliary electrode 32 can be connected through the thin liquid layer formed on the surface of the working electrode 33 and the auxiliary electrode 32 to form a closed loop. The thin liquid layer on the working surface of the working electrode 33 is connected to the reference electrode 35 to form a connected loop of thin liquid layer-KCl gel salt bridge-saturated KCl solution-reference electrode 35. Then, the constant potential meter is used to perform current polarization, and the potential of the working electrode is measured to obtain a state point of the polarization curve. Then, the polarization current density is changed, and the above steps are repeated. Each time the polarization current density is changed, a working electrode potential is measured and a polarization state point is obtained. The multiple state points obtained above are smoothly connected to draw a polarization curve.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electrochemical testing device for measuring vapor phase corrosion inhibitors in a marine atmosphere environment, characterized in that: The invention comprises a transparent observation cover (1), a transparent cover plate (14) being hingedly connected to the top surface of the transparent observation cover (1), a test chamber (10) being arranged inside the transparent observation cover (1), and a corrosion inhibitor electrochemical test component (3) for testing the effect of a gas phase corrosion inhibitor on metal protection under humid atmosphere and wet atmosphere conditions being arranged inside the test chamber (10); A heat conducting plate (11) is fixedly mounted on the bottom of the transparent observation cover (1), a base (12) is fixedly mounted on the bottom of the heat conducting plate (11), a plurality of heating rods (121) arranged at equal intervals are fixedly mounted on the inner wall of the base (12), and the heating rods (121) are used to perform a heating operation on the inside of the transparent observation cover (1); The transparent observation cover (1) is provided with a glycerin adding device (2), the glycerin adding device (2) comprising a micrometering pump (20) arranged on one side of the transparent observation cover (1), an oil outlet pipe (21) is fixedly mounted on the oil outlet end pipe body of the micrometering pump (20), the end of the oil outlet pipe (21) is fixedly mounted on the transparent observation cover (1) and is connected to the interior of the test chamber (10), an oil inlet pipe (22) is fixedly mounted on the oil inlet end pipe body of the micrometering pump (20), a storage tank (23) is fixedly mounted on the end of the oil inlet pipe (22), and a top cover (24) is hingedly connected to the top surface of the storage tank (23) via a hinge; The corrosion inhibitor electrochemical test assembly (3) comprises a storage cylinder (30) placed in the test chamber (10), a sealing cover (31) is arranged at the top of the storage cylinder (30), a working electrode (33) composed of a metal sample to be measured and an auxiliary electrode (32) which forms a loop with the working electrode (33) and is used to form polarization for the research electrode are fixedly mounted on the top surface of the sealing cover (31), a reference electrode (35) which serves as a standard for measuring and researching potential comparison is fixedly mounted on the storage cylinder (30), a center hole (34) which is connected to the inside of the storage cylinder (30) is fixedly mounted on the top surface of the sealing cover (31), a saturated KCl solution is stored in the storage cylinder (30), a saturated KCl gel salt bridge is arranged in the center hole (34), and the distance between the working electrode (33) and the auxiliary electrode (32) and the reference electrode (35) is between 0.3 mm and 0.6 mm; A thin liquid layer thickness measuring component (4) for measuring the thickness of a thin liquid layer generated on the surface of the working electrode (33) is fixedly mounted on the wall of the test chamber (10); the thin liquid layer thickness measuring component (4) comprises a micrometer (42); a platinum wire probe (43) is fixedly mounted on the micrometer (42); The thin liquid layer thickness measuring assembly (4) further comprises a support plate (40) fixedly mounted on the wall of the test chamber (10), an electric push rod (41) fixedly mounted on the bottom surface of the support plate (40), a rectangular plate (411) fixedly mounted on the end of the telescopic shaft of the electric push rod (41), and the micrometer (42) fixedly mounted on the rectangular plate (411) by means of a fastening screw.

2. The electrochemical testing device for measuring vapor phase corrosion inhibitor under marine atmospheric environment according to claim 1, characterized in that: A thermometer and hygrometer (13) for measuring temperature and humidity is fixedly mounted on the wall of the test chamber (10).

3. The electrochemical testing device for measuring vapor phase corrosion inhibitor under marine atmospheric environment according to claim 1, characterized in that: A sealing gasket (141) is fixedly mounted on the surface of the transparent cover plate (14).

4. The electrochemical testing device for measuring vapor phase corrosion inhibitor under marine atmospheric environment according to claim 1, characterized in that: The top surface of the transparent observation cover (1) and the transparent cover plate (14) are both arranged to be inclined downward by 30 to 60 degrees.

5. The electrochemical testing device for measuring vapor phase corrosion inhibitor under marine atmospheric environment according to claim 4, characterized in that: The platinum wire probe (43) is located directly above the working electrode (33).

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