A dry-wet alternating ultraviolet light simulation corrosion test device

Abstract

The present invention provides a dry-wet alternating ultraviolet light simulation corrosion test device, which belongs to the field of corrosion test technology. The outstanding feature of this device is that it uses water circulation to simulate the process of "high tide" and "low tide" of seawater, and a small stirring device is set in the box. First, it can cooperate with water inlet and outlet to improve the flow state of the fluid in the test box, which is more in line with the dynamic dry-wet alternating environment of the real sea. Second, it can improve the mass transfer and heat transfer in the test box. Third, in the cleaning mode, the rotation of the stirring device is conducive to enhancing the turbulence of the fluid, thereby achieving a better cleaning effect. In addition, adding deionized water circulation to the previous circulation system enables the test device to have a self-cleaning function, which is more conducive to device maintenance, and combines the water for water bath insulation and the water for cleaning into one, thereby improving the utilization of space and resources. At the same time, water bath heating also makes the heating more uniform; the reasonable arrangement makes the space utilization rate in the test box high, and the flexible pipeline design is suitable for working under various conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of corrosion testing, and in particular relates to a dry-wet alternating corrosion aging testing device for simulating materials in a marine environment under ultraviolet light conditions through dynamic water circulation. Background Art

[0002] my country has a vast territory, a total coastline of more than 32,000 kilometers, and abundant marine resources. However, the problem of marine corrosion has existed since ancient times. Corrosion refers to the destruction or deterioration of materials or their properties under the influence of the environment, which greatly reduces the service life of the materials. Corrosion testing is an important means to understand the characteristics of the corrosion system composed of materials and the environment, study the corrosion mechanism, and thus control the corrosion process.

[0003] my country has been conducting corrosion protection research for nearly 70 years. Now the corrosion protection research system has gradually formed, and new technologies and methods for corrosion protection research are emerging in an endless stream. Among them, corrosion testing is the basis of corrosion protection. How to develop more complete corrosion testing technology that is more suitable for different environmental characteristics based on existing research has a far-reaching impact on the development of the corrosion protection field. The material real sea corrosion aging test has the characteristics of long corrosion cycle, diverse and complex corrosion environment, etc., which requires a lot of manpower and material resources. In comparison, indoor simulated corrosion tests can obtain test results quickly in a short time, and through short-term accelerated tests, it is possible to speculate the long-term corrosion behavior of materials to a certain extent, and it is also convenient to analyze and study the influence of one or several typical environmental factors on material corrosion and their action laws. Therefore, it is of great significance to develop a test device that can effectively simulate the marine corrosion process of materials. Marine corrosion is the result of the combined action of many factors such as temperature and humidity, salinity, fluid impact, biology, oxygen content, and pH value. Therefore, in different corrosion areas, the factors affecting the marine environmental corrosion of metal materials are also different.

[0004] At present, there are many methods for indoor accelerated corrosion tests of marine environmental corrosion of materials at home and abroad, mainly including wet heat test, salt spray test, immersion test and comprehensive simulation test, etc. However, the tests are not targeted at different marine corrosion zones and cannot take into account the specific environmental characteristics of corrosion in each corrosion zone. The development and maturity of corrosion test research has made it possible to carry out more targeted indoor corrosion simulation tests. Researchers have developed various types of indoor simulation corrosion test devices, and the test methods lack systematicity.

[0005] The corrosion of materials is affected by moisture, oxygen, light and some other chemical factors. In the tidal zone of the ocean and the waterline area of ​​the hull, the change of water level or the fluctuation of the water surface makes the materials constantly in the condition of alternating dry and wet, and is subjected to the alternating action of water and air, which greatly enhances the corrosiveness of the corrosive medium. In the real sea environment, the surface seawater is constantly fluctuating due to the tidal action or the movement of the hull, so that the materials immersed in the water are constantly affected by the movement of the fluid, and the materials at the waterline are subjected to a high-frequency alternating dry and wet process. The existing dry-wet alternating corrosion aging simulation test devices mostly use test frames or mechanical arms to control the lifting of materials to simulate the dry-wet alternating process. After the sample enters the corrosive solution and is in a stable state, the surface of the sample and the surrounding solution are relatively static. However, after the corrosion reaction occurs on the surface of the sample, the corrosive solution around its surface may differ from the composition and concentration of the main solution in the test chamber, and this state will continue until the next cycle, which is different from the corrosion in the real sea environment. In addition, the design of most corrosion test chambers does not fully consider the convenience of use, maintenance and cleaning of the test chambers. In addition, the UV lamps, instrumentation and other equipment are in a high-temperature, salty and humid space with the test samples, and the working environment is harsh, which will have a certain impact on the service life of the test chamber and the test results. Therefore, it is very necessary to design a test device that can effectively simulate the dry-wet alternating corrosion process in the marine environment and consider cleaning and maintenance issues. Summary of the invention

[0006] The technical task of the present invention is to provide a dry-wet alternating ultraviolet light simulation corrosion test device to address the deficiencies of the prior art. The technical problems solved are as follows:

[0007] 1. Aiming at the problem of uneven solution composition caused by insufficient fluidity of solution in the corrosion test chamber in the prior art, a simulated corrosion test chamber is designed to realize the dry-wet alternation process of the corrosion solution through water circulation in order to better simulate the dry-wet alternation process;

[0008] 2. In order to realize the automatic cleaning function of the corrosion test chamber, the water circulation pipeline should be reasonably designed;

[0009] 3. In order to improve the working environment of instruments, quartz glass and instrument boxes are used to separate the instrument area from the corrosion test area.

[0010] The technical solution adopted by the present invention to solve its technical problem is:

[0011] A dry-wet alternating ultraviolet light simulated corrosion test device, the main structure of which includes a test unit, a solution tank, a water bath and a water circulation control pipeline system, one side of the test box in the test unit is quartz glass, and the ultraviolet lamp and the automatic control system are installed on the side of the glass wall plate outside the test box; a stirring wave-making device is installed in the test box, and the test sample is clamped with an ordinary detachable sample rack, which is hung and fixed from the upper part of the test box during the test, and the stirring wave-making device needs to be avoided during installation; a solution tank is provided on the other side of the test box, and two anti-corrosion pumps are arranged in parallel with the solution tank; the lower side of the test box is a water bath, and while the test box is heated and insulated, the deionized water in the water bath can enter the test box through the water circulation system to rinse the test box;

[0012] The water circulation control pipeline system is connected to the test box, the solution box and the water bath box through pipeline elements, and the pipeline elements include a tee, an anti-corrosion pump, a control valve and a preheating device.

[0013] Optionally, the ratio of the volume of the solution tank to the volume of the test solution when the required liquid level in the test box is the highest is not less than 3.0, and a temperature sensor and a liquid level sensor are provided in the test box.

[0014] Optionally, the automatic control microcomputer and power distribution system are placed in an automatic control box, connected to the control valve, anti-corrosion pump, temperature sensor, and liquid level sensor through circuits, and the signal transmission line and power supply line are arranged along the inside of the test device casing and protected by a circuit protection shell.

[0015] Optionally, when the test set solution temperature is higher than the solution temperature in the solution tank, the preheating device is started. The preheating device uses an electric heater to quickly heat the pipeline fluid. The circulating water system pipeline uses a DN25 austenitic stainless steel seamless steel pipe. The inlet and outlet water of the test box solution are powered by two anti-corrosion pumps respectively. The two pumps cooperate to complete the test box-solution tank water circulation in the "test mode" and the water bath box-test box water circulation in the "cleaning mode".

[0016] Optionally, the deionized water in the water bath is heated by an electric heating tube, and the start-up of the heating device is regulated by an automatic control system according to system settings and temperature sensor feedback.

[0017] Optionally, the quartz glass has a thickness of 10 mm.

[0018] Optionally, the stirring wave-making device uses a three-blade propulsion stirring impeller with a diameter of 150 mm, and the relevant parameters are based on the standard H / GT 3796.1-2005.

[0019] Optionally, the preheating device is a small surface coating heating device.

[0020] Optionally, the water bath and the outside of the test box are wrapped with an insulation layer except for the quartz glass side to reduce the heat dissipation rate of the test box and the water bath, while protecting other instruments and equipment in the device from being affected by the test temperature.

[0021] Compared with the prior art, the dry-wet alternating ultraviolet light simulation corrosion test device of the present invention has the following beneficial effects:

[0022] The outstanding feature of the circulating water dry-wet alternating corrosion UV corrosion test device designed in the present invention is that it uses water circulation to simulate the process of "high tide" and "low tide" of seawater, and a small stirring device is set in the box. First, it can cooperate with water inlet and outlet to improve the flow state of the fluid in the test box, which is more in line with the dynamic dry-wet alternating environment of the real sea. Second, it can improve the mass transfer and heat transfer in the test box. Third, in the cleaning mode, the rotation of the stirring device is conducive to enhancing the turbulence of the fluid, thereby achieving a better cleaning effect. In addition, adding deionized water circulation to the previous circulation system enables the test device to have a self-cleaning function, which is more conducive to device maintenance, and combines the water for water bath insulation and the water for cleaning into one, thereby improving the utilization of space and resources. At the same time, water bath heating also makes the heating more uniform; the reasonable arrangement makes the space utilization rate in the test box high, and the flexible pipeline design is suitable for working under various conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0024] Figure 2 It is the water cycle flow chart of the present invention.

[0025] In the figure, 1. UV lamp; 2. Quartz glass; 3. Stirring wave-making device; 4. Solution tank; 5. Preheating device; 6. Anti-corrosion pump; 7. Water inlet and outlet; 8. Circuit protection shell; 9. Electric heating tube; 10. Automatic control system. DETAILED DESCRIPTION

[0026] Combine the following Figure 1 and Figure 2 A dry-wet alternating ultraviolet light simulation corrosion test device of the present invention is described in detail below.

[0027] like Figure 1As shown, a dry-wet alternating ultraviolet light simulation corrosion test device of the present invention has a main structure including a test unit, a solution tank 4, a water bath and a water circulation control pipeline system. One side of the test box in the test unit adopts a transparent quartz glass 2 with good light transmittance as a wall panel, which can ensure the required light transmittance while isolating the ultraviolet lamp 1 from the test environment. The ultraviolet lamp 1 and the automatic control system 10 are installed on one side of the glass wall panel outside the test box; a stirring wave-making device 3 is installed in the test box, and a common detachable sample rack is used for clamping the test sample. During the test, it is suspended and fixed from the upper part of the test box, and the stirring wave-making device 3 needs to be avoided during installation; a solution tank 4 is provided on the other side of the test box, and two anti-corrosion pumps 6 are arranged parallel to it; the lower side of the test box is a water bath.

[0028] Combined with Figure 2 The water circulation control pipeline system connects the test box, the solution box 4 and the water bath box through pipeline components, and the pipeline components include a tee, an anti-corrosion pump 6, a control valve, and a preheating device 5. The water circulation control pipeline system, combined with the stirring wave-making device 3 in the test box, simulates the rise and fall of tides and the fluctuation of sea water. When simulating high tide, the automatic control system controls valves 103 and valves 101 to open and keep other valves in a closed state. The fluid entering the test box comes from the solution box 4 and is powered by pump 601; when simulating "low tide", the control system controls valves 102 and valves 104 to open and keep other valves in a closed state, powered by pump 602, and the fluid flows back from the test box to the solution box 4; in the cleaning mode, the fluid entering and leaving the test box is deionized water from the water bath box. When the test box is filled with water, valves 106 and valves 103 are opened and other valves are kept in a closed state, powered by pump 601, and when the water is discharged, valves 104 and valves 105 are opened and other valves are kept in a closed state, powered by pump 602.

[0029] The volume ratio of the solution tank 4 to the test solution volume at the highest required liquid level in the test box is not less than 3.0, and the test box is provided with a temperature sensor and a liquid level sensor. The solution tank 4 stores real seawater or corrosion solution according to the test needs. In view of the fact that high temperature and air flow will cause the test solution solvent to evaporate during the test, thereby changing the concentration of the test solution, a pH monitor is provided on the pipeline to monitor the changes in the properties of the test solution. The solution tank 4 has a water outlet and two water inlets; the water bath box stores deionized water, and the water stored in the water bath box has two functions, one is to serve as a heat-conducting medium to provide heat for the test box, and the other is to use the water in the water bath box to rinse the test box at the end of the test, so deionized water is stored in the water bath box, the water bath box has a water outlet and a water inlet, and a heating pipe is arranged inside. The opening and closing of the heating device control circuit in the water bath box is controlled by the automatic control system 10 according to the feedback of the temperature sensor; the test box is the area where the sample undergoes dry-wet alternating corrosion test, and has a water inlet and a water outlet.

[0030] The above-mentioned automatic control microcomputer and power distribution system are placed in the automatic control box, connected with the control valve, anti-corrosion pump 6, temperature sensor, and liquid level sensor through circuits, and the signal transmission line and power supply line are arranged along the inner side of the test device shell and protected by the circuit protection shell 8. The automatic control system 10 automatically adjusts the stirring wave device 3, the control valve switch, the operation of the anti-corrosion pump 6, and the operation of the heating device through the system setting information and the various parameters obtained by the implementation of monitoring.

[0031] The deionized water in the water bath is heated by an electric heating tube 9, and the start of the heating device is regulated by an automatic control system 10 according to system settings and temperature sensor feedback.

[0032] The thickness of the quartz glass 2 is 10 mm.

[0033] The stirring wave-making device 3 uses a three-blade propulsion stirring impeller with a diameter of 150 mm, and the relevant parameters are based on the standard H / GT 3796.1-2005.

[0034] The preheating device 5 is a small surface coating heating device.

[0035] The outer sides of the water bath and the test box are wrapped with an insulation layer except for the side of the quartz glass 2 to reduce the heat dissipation rate of the test box and the water bath, while protecting other instruments and equipment in the device from being affected by the test temperature.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dry-wet alternating ultraviolet light simulation corrosion test device, characterized in that: Its main structure comprises a test unit, a solution box (4), a water bath and a water circulation control pipeline system. One side of the test box in the test unit is made of quartz glass (2), and an ultraviolet lamp (1) and an automatic control system (10) are installed on one side of the glass wall panel outside the test box. A stirring wave-making device (3) is installed in the test box. A common detachable sample rack is used to clamp the test sample. During the test, the sample is suspended and fixed from the upper part of the test box. During the installation, the stirring wave-making device (3) needs to be avoided. A solution box (4) is arranged on the other side of the test box, and two anti-corrosion pumps (6) are arranged in parallel with the solution box. The lower side of the test box is a water bath. While heating and keeping the test box warm, deionized water in the water bath can enter the test box through a water circulation system to rinse the test box. The water circulation control pipeline system is connected to the test box, the solution box (4) and the water bath box through pipeline components, and the pipeline components include a tee, an anti-corrosion pump (6), a control valve, and a preheating device (5); When the test set solution temperature is higher than the solution temperature in the solution tank (4), the preheating device (5) is started. The preheating device (5) uses an electric heater to quickly heat the pipeline fluid. The circulating water system pipeline uses a DN25 austenitic stainless steel seamless steel pipe. The inlet and outlet water of the test box solution are respectively powered by two anti-corrosion pumps (6). The two pumps cooperate to complete the test box-solution tank (4) water circulation in the "test mode" and the water bath box-test box water circulation in the "cleaning mode".

2. The dry-wet alternating ultraviolet light simulation corrosion test device according to claim 1, characterized in that: The ratio of the volume of the solution box (4) to the volume of the test solution when the required liquid level in the test box is the highest is not less than 3.0, and a temperature sensor and a liquid level sensor are arranged in the test box.

3. The dry-wet alternating ultraviolet light simulation corrosion test device according to claim 2, characterized in that: The automatic control microcomputer and power distribution system are placed in the automatic control box, and are connected to the control valve, the anti-corrosion pump (6), the temperature sensor, and the liquid level sensor through a circuit. The signal transmission line and the power supply line are arranged along the inner side of the test device shell and are protected by a circuit protection shell (8).

4. A dry-wet alternating ultraviolet light simulation corrosion test device according to any one of claims 1 to 3, characterized in that: The deionized water in the water bath is heated by an electric heating tube (9), and the activation of the heating device is regulated by an automatic control system (10) according to system settings and temperature sensor feedback.

5. A dry-wet alternating ultraviolet light simulation corrosion test device according to any one of claims 1 to 3, characterized in that: The thickness of the quartz glass (2) is 10 mm.

6. A dry-wet alternating ultraviolet light simulation corrosion test device according to any one of claims 1 to 3, characterized in that: The stirring wave-making device (3) uses a three-blade propulsion stirring impeller with a diameter of 150 mm, and the relevant parameters are based on the standard H / GT 3796.1-2005.

7. A dry-wet alternating ultraviolet light simulation corrosion test device according to any one of claims 1 to 3, characterized in that: The preheating device (5) is a small surface coating heating device.

8. A dry-wet alternating ultraviolet light simulation corrosion test device according to any one of claims 1 to 3, characterized in that: The water bath and the test box are wrapped with a heat-insulating layer on the outside except for the quartz glass (2) side, so as to reduce the heat dissipation rate of the test box and the water bath, and at the same time protect other instruments and equipment in the device from being affected by the test temperature.

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