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CN-121632927-B - Material corrosion testing device and testing method for simulating ocean acidification environment

CN121632927BCN 121632927 BCN121632927 BCN 121632927BCN-121632927-B

Abstract

The invention relates to the technical field of material performance test, and discloses a material corrosion test device and a test method for simulating marine acidification environment, wherein the material corrosion test device comprises a closed simulation test cabin, a salt spray simulation cabin, a damp-heat simulation cabin and a high-pressure soaking simulation cabin, wherein the interior of the closed simulation test cabin is partitioned by an upper isolation plate and a lower isolation plate which are horizontally arranged and can be opened and closed to form a salt spray simulation cabin, a damp-heat simulation cabin and a high-pressure soaking simulation cabin from top to bottom, and a switch cabin door with a sealing structure is arranged at the top of the closed simulation test cabin; the device realizes accurate coupling and seamless switching of corrosion environments such as salt spray injection, high temperature and high humidity, deep sea high pressure and the like by combining the automatic switching function of the rotatable lifting sample frame through the independent modularized design of the salt spray simulation cabin, the damp and hot simulation cabin and the high pressure soaking simulation cabin, and the sample can complete full-period corrosion behavior research of a marine atmosphere area, a splash area, a tidal range area and a full-soaking area on the same platform, so that interface effects caused by the traditional multi-equipment serial connection test are eliminated.

Inventors

  • FENG YUCHENG
  • JIA FEI
  • ZHANG JINGWEI
  • LIU CHENXI

Assignees

  • 大连理工大学

Dates

Publication Date
20260508
Application Date
20260205

Claims (10)

  1. 1.A material corrosion testing arrangement for simulating ocean acidizing environment, characterized by includes: The inside of the closed simulation test cabin (1) is divided into a salt fog simulation cabin (4), a damp-heat simulation cabin (5) and a high-pressure soaking simulation cabin (6) from top to bottom by horizontally arranging an upper isolation plate (2) and a lower isolation plate (3) which can be opened and closed, and the top of the closed simulation test cabin is provided with a switch cabin door (7) with a sealing structure; The rotatable lifting sample rack (8) is vertically arranged at the central axis of the closed type simulation test cabin (1) through the lifting guide component (9), can pass through the salt spray simulation cabin (4), the damp-heat simulation cabin (5) and the high-pressure soaking simulation cabin (6) along the vertical direction under the servo drive, synchronously rotates around the shaft, and realizes the automatic switching of samples in different corrosion environments and the dynamic updating of surface liquid films; Wherein: the salt spray simulation cabin (4) is provided with a salt spray assembly (10) and a first temperature and humidity sensor (11), and a first discharging pipe (12) is arranged on the side wall of the salt spray simulation cabin and used for discharging waste mist condensate; The damp-heat simulation cabin (5) is provided with a damp-heat simulation assembly (13) and a second temperature and humidity sensor (14), and the side wall of the damp-heat simulation cabin is provided with a second discharging pipe (15) for discharging high-temperature condensation drainage; The high-pressure soaking simulation cabin (6) is a pressure-resistant sealing cavity, is provided with a circulating immersion liquid assembly (16) and a third temperature and humidity sensor (17), is provided with a third discharging pipe (18), a third feeding pipe (19) and a pressure pipe (24) on the side wall, supports artificial seawater injection and CO 2 bubbling to adjust the pH value, and simulates the ocean acidification process; the tail ends of the first discharging pipe (12) and the second discharging pipe (15) are connected to a multi-stage purifying box (20) together, and purified effluent is conveyed to a steam generator of the damp-heat simulation assembly (13) through a return pipe (21) for recycling; The second discharging pipe (15) is sleeved with a waste heat recovery component (22), the heat energy output end of the waste heat recovery component is thermally coupled with the outside of the third feeding pipe (19), and fresh immersion liquid entering the high-pressure immersion simulation cabin (6) is preheated by utilizing waste heat of water discharged by the damp-heat simulation cabin (5); The whole device realizes multi-stage programmed circulation operation of salt fog, damp heat and soaking through a PLC (programmable logic controller) 23, and completes multi-level marine corrosion environment simulation from a splash zone, a tidal range zone to a full soaking zone.
  2. 2. The material corrosion testing apparatus for simulating a marine acidizing environment of claim 1, wherein: The upper isolation plate (2) is horizontally arranged in an upper middle region in the closed simulation test cabin (1) and comprises an upper base (201) symmetrically fixed on the inner wall of the cabin body, the upper base (201) is internally and slidably embedded with a corrosion-resistant isolation plate (202), and the corrosion-resistant isolation plate (202) is driven by a first electric telescopic cylinder (203) to reciprocate along the horizontal direction so as to realize on-off control between the salt spray simulation cabin (4) and the damp-heat simulation cabin (5); a flexible silica gel sealing strip (204) is arranged between the opposite end surfaces of two adjacent corrosion-resistant isolation plates (202) to form an airtight isolation interface; The heating films (205) are respectively embedded on the lower surface of the corrosion-resistant isolation plate (202) and the end surface of the upper base (201) facing to one side of the damp-heat simulation cabin (5) and are used for maintaining the temperature stability of the upper isolation area and preventing condensed water accumulation.
  3. 3. The material corrosion testing apparatus for simulating a marine acidizing environment of claim 1, wherein: The lower isolation plate (3) is horizontally arranged at the middle part of the closed simulation test cabin (1) and is positioned between the damp-heat simulation cabin (5) and the high-pressure soaking simulation cabin (6), and comprises lower bases (301) symmetrically arranged on the side walls of the closed simulation test cabin (1), high-strength pressure-bearing sealing partition plates (302) are movably connected between the lower bases (301), the high-strength pressure-bearing sealing partition plates (302) are of a double-layer metal composite structure, the inner layer is a titanium alloy reinforcing plate (3021), and the outer layer is a stainless steel plate (3022); the high-strength pressure-bearing sealing partition plate (302) is driven by a second electric telescopic cylinder (304) to reciprocate along the horizontal direction, so that on-off control between the damp-heat simulation cabin (5) and the high-pressure soaking simulation cabin (6) is realized; The perfluoroether rubber sealing strips (303) are arranged on the butt joint surfaces of the two ends of the high-strength pressure-bearing sealing partition plate (302), and form a high-pressure-resistant sealing structure in a closed state, so that the sealing reliability of the high-pressure soaking simulation cabin (6) is ensured.
  4. 4. The material corrosion testing apparatus for simulating a marine acidizing environment of claim 1, wherein: The rotatable lifting sample rack (8) is vertically arranged along the central axis of the closed type simulation test cabin (1) and penetrates through the salt spray simulation cabin (4), the damp-heat simulation cabin (5) and the high-pressure soaking simulation cabin (6); The outer side wall of the closed simulation test cabin (1) is fixedly provided with a hollow lifting seat (901), the top of the hollow lifting seat (901) is provided with a first servo motor (904), the output end of the first servo motor is connected with a threaded rod (902), and the threaded rod (902) extends upwards and is in threaded fit with a lifting guide block (903); The lifting guide block (903) is connected with a lifting slide block (906) which is arranged on the side wall of the closed type simulation test cabin (1) in a mirror image mode through magnetic coupling, a first magnet (908) is arranged in the lifting guide block (903), a second magnet (909) is correspondingly arranged in the lifting slide block (906), a non-contact synchronous traction structure is formed by the polarity of the first magnet and the polarity of the second magnet, and the lifting slide block (906) is arranged in a lifting guide rod (907) on the side wall of the closed type simulation test cabin (1) in a sliding mode; Sample fixed plate (801) is fixed in between lift slider (906) through rotation axis (802), and through second servo motor (905) rotary control in one side lift slider (906), sample fixed plate (801) include screen cloth mount (8011) and can dismantle isolated screen cloth (8012) between screen cloth lock frame (8012) of lock and the two, sample centre gripping is in between screen cloth mount (8011) and screen cloth lock frame (8012), and wholly realize traversing perpendicularly and pivoting linkage along with lift direction subassembly (9).
  5. 5. The material corrosion testing apparatus for simulating a marine acidizing environment of claim 1, wherein: The salt spray assembly (10) is arranged on the inner wall of the top of the salt spray simulation cabin (4), a plurality of salt spray nozzles (1001) are symmetrically distributed and incline towards a rotatable lifting sample frame (8) at the central axis, a dynamic intersection angle is formed between the spray direction and the surface of a sample, and a first temperature control plate (401) is embedded in the side wall of the salt spray simulation cabin (4); Each salt spray nozzle (1001) is communicated with an external salt spray solution storage tank through a salt spray inlet pipe (1002), a pre-filter (1004) is arranged on the salt spray inlet pipe (1002), and a stainless steel sintering net filter layer (10041) and a nylon microporous filter membrane layer (10042) which are sequentially arranged along the fluid direction are arranged in the pre-filter (1004); Each salt spray nozzle (1001) is internally integrated with an ultrasonic vibrator (1003) for atomizing liquid into micron-sized particles; the shunt tube (2101) on the return tube (21) extends to the lower part of the pre-filter (1004), and the surface of the filter element is periodically flushed by the intermittent pump (2102) to realize a self-cleaning function.
  6. 6. The material corrosion testing apparatus for simulating a marine acidizing environment of claim 1, wherein: the damp-heat simulation assembly (13) comprises a circulating fan (1301) fixed on the outer wall of the closed simulation test cabin (1), and is connected to an air inlet disc (1303) arranged on the side part of the damp-heat simulation cabin (5) through a hollow air inlet pipe (1302), and a second temperature control plate (501) is embedded in the damp-heat simulation cabin (5); The inside of the air inlet disc (1303) is divided into a temperature control cavity (1305) and a humidifying cavity (1306) which are arranged on the same plane by an annular partition plate (1304), a heating plate (1307) and a condensing plate (1308) are alternately arranged in the circumferential direction in the temperature control cavity (1305), and the humidifying cavity (1306) is connected with an external steam generator through a humidifying air inlet pipe (1309); the humidifying air inlet pipe (1309) is coaxially nested in the hollow air inlet pipe (1302), and the tail end of the humidifying air inlet pipe extends into the humidifying cavity (1306) and is provided with a circumferential sprinkler head (1310); The partition plate (1304) is uniformly provided with first flow holes (1311) so that air flows between the temperature control cavity (1305) and the humidification cavity (1306) in a staggered way, one side of the air inlet disc (1303) facing the damp-heat simulation cabin (5) is provided with a second flow hole (1312) array, and the mixed air flows are guided to surround the rotatable lifting sample frame (8) to form a uniform temperature-humidity field.
  7. 7. The material corrosion testing apparatus for simulating a marine acidizing environment of claim 1, wherein: the circulating immersion liquid assembly (16) comprises an immersion liquid circulating pump (1601) arranged on the side wall of the closed type simulation test cabin (1), wherein a liquid inlet and a liquid outlet of the immersion liquid circulating pump are respectively connected to liquid inlet and liquid outlet ports on two sides of the high-pressure immersion simulation cabin (6) through circulating pipes (1602) to form a closed circulation loop, and a third temperature control plate (601) is embedded in the high-pressure immersion simulation cabin (6); The bubbling ring (1603) is horizontally arranged at the bottom of the high-pressure soaking simulation cabin (6) and is in a rectangular frame structure, bubbling holes (1604) are uniformly distributed on the upper surface of the bubbling ring, and an internal channel is communicated with external air supply equipment through an air pipe (1605); the bubbling ring (1603) and the rotatable lifting sample frame (8) keep a constant distance, so that CO 2 gas passes through the surface area of the sample from bottom to top, and the synergistic effect of pH adjustment and corrosive medium disturbance is realized.
  8. 8. The material corrosion testing apparatus for simulating a marine acidizing environment of claim 1, wherein: The multistage purifying box (20) is independently arranged outside the closed simulation test cabin (1), a first liquid inlet (2002) and a second liquid inlet (2003) which are respectively connected with the first discharging pipe (12) and the second discharging pipe (15) are arranged at the top of the multistage purifying box, and two waste liquid flows downwards and sequentially pass through the composite filter layer (2004) after converging; The composite filter layer (2004) comprises a cotton filter element layer (20041), a reverse osmosis membrane layer (20042) and an active carbon adsorption layer (20043) from top to bottom, and is fixed on a support frame (2005) of the inner cavity of the purifying box body (2001); the purified liquid returns to the steam generator of the damp-heat simulation component (13) through a bottom return pipe (21); the ultraviolet lamps (2006) are symmetrically arranged on the inner walls of the two sides of the purifying box body (2001), are positioned below the composite filter layer (2004) and irradiate the flowing region to kill microorganisms; the bottom is also provided with an inclined diversion waste liquid recovery tank (2007) for intensively discharging non-reusable impurities; an exhaust pipe (2008) is arranged on the side wall of the purifying box body (2001) above the composite filter layer (2004) and is used for exhausting gas generated in the purifying process.
  9. 9. The material corrosion testing apparatus for simulating a marine acidizing environment of claim 1, wherein: The waste heat recovery assembly (22) comprises a first heat exchange tube (2201) sleeved outside the second discharging pipe (15) and a second heat exchange tube (2202) sleeved outside the third feeding pipe (19), and the first heat exchange tube and the second heat exchange tube are communicated through a circulating heat exchange tube (2203) to form a closed heat exchange loop; The circulating heat exchange tube (2203) comprises a first heat exchange tube (22031) spirally wound on the outer wall of the second discharging tube (15), a second heat exchange tube (22032) spirally wound on the outer wall of the third feeding tube (19), and a medium conveying tube (22033) connected with the ends of the first heat exchange tube and the second heat exchange tube; The high-temperature drainage flows through the first heat exchange tube (22031) when being discharged from the damp-heat simulation cabin (5), heat of the high-temperature drainage is transferred to the circulating medium, the circulating medium flows to the second heat exchange tube (22032) to release heat, fresh immersion liquid entering the high-pressure immersion simulation cabin (6) is preheated, and energy cascade utilization is achieved.
  10. 10. A material corrosion testing method for simulating a marine acidizing environment according to any one of claims 1-9, including the steps of: S1, sample installation and system initialization Opening a switch cabin door (7) at the top of the closed simulation test cabin (1), clamping a material sample to be tested on a rotatable lifting sample frame (8) and sealing the cabin body; Setting operation parameters of each stage of salt fog, damp heat and high pressure soaking through a PLC (23), and checking the states of each sensor and an executing mechanism; S2, multistage cyclic corrosion test Starting a PLC (programmable logic controller) 23 to preset a program, controlling the opening and closing states of the upper isolation plate 2 and the lower isolation plate 3, driving the rotatable lifting sample frame 8 to sequentially penetrate through the salt spray simulation cabin 4, the damp-heat simulation cabin 5 and the high-pressure soaking simulation cabin 6 under the driving of the servo motor, and respectively realizing: An atomized salt solution is applied in the salt spray simulation cabin (4) through a salt spray assembly (10) to form a splash zone corrosion environment; A high-temperature high-humidity environment is established in the damp-heat simulation cabin (5) through a damp-heat simulation assembly (13), and the corrosion condition of a tidal range is simulated; Injecting artificial seawater into the high-pressure soaking simulation cabin (6) and adjusting the pH value through CO 2 bubbling to simulate the corrosion process of the full-immersion area under ocean acidification; s3, waste liquid treatment and energy recovery The salt fog condensate and the wet and hot condensate are respectively discharged into a multi-stage purifying box (20) through a first discharging pipe (12) and a second discharging pipe (15), and are sent back to the steam generator for recycling through a return pipe (21) after being purified; Meanwhile, the waste heat recovery component (22) is used for recovering high-temperature drainage heat, and fresh immersion liquid entering the high-pressure immersion simulation cabin (6) is preheated; s4, automatic switching and surface updating Before each environment is switched, the rotatable lifting sample frame (8) is driven by the lifting guide assembly (9) to accurately lift and synchronously rotate, so that the position transfer of a sample and the dynamic update of a surface liquid film are realized, and the corrosion uniformity is improved; S5, data acquisition and circulation control In the whole test process, a PLC (23) collects environmental data of a first temperature and humidity sensor (11), a second temperature and humidity sensor (14) and a third temperature and humidity sensor (17) in real time, records the running state of each component, and automatically judges whether to enter the next cycle after finishing a single period; S6, ending the test and obtaining the result And after the preset cycle times are reached, stopping running, lifting the rotatable lifting sample rack (8) to an initial position, opening the switch cabin door (7) to take out a sample, and carrying out corrosion morphology and component analysis to obtain corrosion behavior data of the material in a simulated marine acidification environment.

Description

Material corrosion testing device and testing method for simulating ocean acidification environment Technical Field The invention relates to the technical field of material performance testing, in particular to a material corrosion testing device and a testing method for simulating ocean acidification environment. Background In marine environments, engineering materials are exposed to complex and variable natural conditions for a long period of time, and face severe corrosion challenges. In order to evaluate the corrosion resistance of a material in the actual service process, a corrosion test becomes a key link in material research and development and engineering application. Traditional corrosion tests have been developed primarily by simulating areas of typical marine environments such as the atmosphere, tidal zones and full immersion. The atmospheric region is mainly characterized by salt fog settlement and high temperature and high humidity, electrochemical corrosion of the metal surface is easy to occur, the oxygen concentration battery is aggravated and the corrosion rate is obviously increased due to periodical dry-wet alternation in a tidal range, and the full-immersion region is in a seawater immersion state for a long time, and the problems of local corrosion, stress corrosion cracking and the like are often caused along with the multiple factors of dissolved oxygen, chloride ions, microorganisms and the like. At present, conventional corrosion test equipment mostly adopts a single environment simulation mode, for example, a salt spray test box only simulates an atmospheric salt spray environment, a constant temperature and humidity box is used for a damp-heat aging test, and a soaking test is performed in a static or circulating water tank. The equipment has simple structure and convenient operation, and meets the basic research requirement to a certain extent. However, the core defect is that the actual working condition of the coupling action of various factors in the marine environment is difficult to truly reproduce. Ocean engineering structures (such as cross-sea bridges, offshore wind power pile foundations, submarine pipelines and the like) often span a plurality of environmental zones, and physical and chemical conditions in different areas are mutually influenced to form a complex corrosion synergistic effect. The single environmental test cannot reflect the cross-regional coupling damage mechanism, so that the experimental result has larger deviation from the field service condition. Another significant problem is the lack of continuity and controllability in the context switch process. Part of researches try to realize multi-environment alternation by manually transferring samples to different devices, but the method is complex in operation, and is easy to introduce external interference in the transfer process, and the continuity of the corrosion process is damaged, so that interface reaction is interrupted or environmental parameters are distorted. In addition, the independent operation of each device causes that the key parameters such as temperature and humidity, salt deposition, solution pH and the like are difficult to accurately connect, and the comparability and reliability of the test are further reduced. Therefore, the prior art still has obvious defects in the aspects of realizing multi-environment dynamic coupling, precise parameter regulation and control and long-term stable operation, and development of a novel testing device capable of integrating various corrosion environments and realizing continuous controllable simulation is needed to truly reveal the corrosion evolution rule of materials under complex ocean working conditions. Disclosure of Invention The invention aims to provide a material corrosion testing device for simulating a marine acidification environment, so as to solve the problems in the background technology. In order to solve the technical problems, the invention provides the following technical scheme that the material corrosion testing device for simulating the ocean acidification environment comprises: the inside of the closed simulation test cabin is divided into a salt spray simulation cabin, a damp-heat simulation cabin and a high-pressure soaking simulation cabin from top to bottom by an upper isolation plate and a lower isolation plate which are horizontally arranged and can be opened and closed, and the top of the closed simulation test cabin is provided with a switch cabin door with a sealing structure; The rotatable lifting sample rack is vertically arranged at the central axis of the closed simulation test cabin through the lifting guide component, can pass through the salt spray simulation cabin, the damp-heat simulation cabin and the high-pressure soaking simulation cabin in the vertical direction under the servo drive, and synchronously rotates around the shaft, so that the automatic switching of samples in different corrosion environme