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CN-121976197-A - Automatic protection device for sacrificial anode in ocean dry-wet alternate environment

CN121976197ACN 121976197 ACN121976197 ACN 121976197ACN-121976197-A

Abstract

The invention relates to the technical field of corrosion protection of marine metal materials, and particularly discloses an automatic protection device for a sacrificial anode in a marine dry-wet alternating environment, which comprises a sacrificial anode body, a welding frame and a protection film arranged above the sacrificial anode body, wherein a guiding and positioning component for guiding the vertical movement stability and keeping the coverage accuracy in the floating and descending processes of the protection film is arranged on the sacrificial anode body, and a limiting fixing frame which is arranged above the protection film and limits the floating distance of the protection film when the protection film automatically floats upwards is arranged on the sacrificial anode body, and the guiding and positioning component is connected with the limiting fixing frame. By constructing a composite protection system of a PTFE substrate and a hydrophobic protection film, a dual protection mechanism of physical isolation and buoyancy driving is formed. The super-hydrophobic characteristic of the hydrophobic film is utilized to actively block water vapor permeation, and the buoyancy is matched to realize automatic opening and closing of the protective film, so that compared with the traditional passive protective means, the anode crusting phenomenon can be delayed from the source.

Inventors

  • GUO LEI
  • Yan Qingni

Assignees

  • 青岛大学

Dates

Publication Date
20260505
Application Date
20260407

Claims (10)

  1. 1. The automatic protection device for the marine dry-wet alternate environment sacrificial anode comprises a sacrificial anode body, a welding frame used for installing the sacrificial anode body on a cabin wall of a ship ballast tank, and is characterized by further comprising a protection film arranged above the sacrificial anode body, when the ship ballast tank is filled with water, the sacrificial anode body is automatically floated up and separated from the surface of the sacrificial anode body by utilizing seawater buoyancy, so that the sacrificial anode body is completely exposed to seawater, when the ship ballast tank is drained, the sacrificial anode body is quickly lowered and unfolded under the action of gravity to cover the surface of the sacrificial anode body, and a guiding and positioning part used for guiding the vertical movement stability and the covering accuracy in the process of floating up and lowering down the protection film is arranged on the sacrificial anode body, and a limiting fixing frame arranged above the protection film and used for limiting the floating up distance of the protection film when the protection film is automatically floated up is connected with the limiting fixing frame.
  2. 2. The automatic protection device for the marine dry-wet alternate environment sacrificial anode according to claim 1, wherein the guiding and positioning component comprises a guiding rod vertically extending upwards along the upper surface of the sacrificial anode body, a fixing hole is formed downwards in the upper surface of the sacrificial anode body, and the guiding rod is fixedly connected with the fixing hole.
  3. 3. The automatic protection device for the marine dry-wet alternate environment sacrificial anode is characterized in that an elastic protection connecting piece for improving connection stability of a guide rod and buffering seawater impact force is arranged in the fixing hole, the elastic protection connecting piece comprises an elastic sleeve, the elastic sleeve is provided with a fixing boss and a connecting cavity allowing the guide rod to pass through, a plurality of annular elastic bodies connected with each other are sequentially arranged downwards in the axial direction of the elastic sleeve from the direction of the fixing boss, and the outer diameter sizes of the adjacent annular elastic bodies are staggered and different.
  4. 4. The apparatus of claim 2, wherein the guide rods are at least two along the length of the sacrificial anode body.
  5. 5. The automatic protection device for the marine dry-wet alternate environment sacrificial anode according to claim 2, wherein the protection film is provided with a guide hole matched with the guide rod, and the diameter of the guide hole is larger than that of the guide rod.
  6. 6. The automatic protection device for the marine dry-wet alternate environment sacrificial anode of claim 5, wherein the ring buckle for reducing friction between the floating and descending processes of the protection film and the guide rod and improving the lifting smoothness is arranged in the guide hole of the protection film.
  7. 7. The automatic protection device for the marine dry-wet alternate environment sacrificial anode is characterized in that the limiting fixing frame comprises two vertical rods respectively fixed on the welding frame and a cross rod arranged between the two vertical rods, positioning connecting holes for fixing guide rods and limiting the floating distance of the protection film are formed in the cross rod, and the guide rods penetrate through the positioning connecting holes and are connected with the cross rod.
  8. 8. The automatic protection device for the marine dry-wet alternate environment sacrificial anode of claim 7, wherein the welding frame is provided with a connecting part for fixing the vertical rod, the connecting part comprises a connecting seat fixed with the welding frame, the connecting seat is provided with a threaded mounting hole, and the threaded mounting hole is in threaded connection with the bottom of the vertical rod.
  9. 9. The automatic protection device for the marine dry-wet alternate environment sacrificial anode is characterized in that the protection film comprises a film body which is arranged in a profiling way with the surface of the sacrificial anode body, and a plurality of shearing lines which divide the film body into an intermediate film body for tightly attaching to the upper surface of the sacrificial anode body and a plurality of side film bodies for tightly attaching to the side surfaces of the sacrificial anode body are sequentially arranged in the circumferential direction of the film body.
  10. 10. The automatic protection device for the marine dry-wet alternate environment sacrificial anode of claim 1, wherein the protection film is prepared from polytetrafluoroethylene resin, and a layer of hydrophobic protection film capable of effectively blocking water vapor permeation and improving buoyancy performance in seawater is compounded on the upper surface of the protection film.

Description

Automatic protection device for sacrificial anode in ocean dry-wet alternate environment Technical Field The invention relates to the technical field of marine metal material corrosion protection, in particular to an automatic protection device for a sacrificial anode in a marine dry-wet alternating environment. Background With the transformation of land economy to marine economy, the fields of marine engineering, ship industry and the like are attracting attention. The marine environment has high temperature, high humidity and high corrosiveness, and seriously threatens the safety of marine structures and ships. There are many marine structures, such as ship ballast tanks, that are often in alternating dry and wet conditions of seawater. The steel member is immersed in seawater at all times, at this time, the metal is mainly corroded by the attack of Cl - in the seawater, the steel member is in humid atmosphere after water is discharged, the environment temperature is high, the humidity is high, the oxygen supply is sufficient, the surface of the cabin board is covered by a water film, and at this time, the cathode process of metal corrosion is mainly controlled by O 2. This severe operating environment causes severe corrosion of the steel structure. Currently, sacrificial anode cathodic protection methods can effectively protect steel components. The sacrificial anode and cathode protection corrosion prevention technology is an electrochemical protection technology for controlling metal corrosion by utilizing potential difference. In the protection process, the potential of the anode material is lower than that of the protected metal, the anode material is more active, when the anode material and the anode material are connected and immersed in electrolyte solution (seawater and the like), the anode material is preferentially oxidized by the electrolyte to generate oxidation reaction, electrons are released and flow to the protected metal, and a layer of protection film is formed on the surface of the protected metal, so that corrosion is prevented. However, the reaction of the sacrificial anode is aggravated under such severe environments (such as ship ballast tanks), the generated insoluble corrosion products (such as aluminum hydroxide, zinc oxide and the like) can be accumulated on the surface of the anode more rapidly, the sacrificial anode is extremely easy to be encrusted and passivated due to the adhesion of the surface corrosion products, and in addition, the corrosion rate of the anode can be accelerated due to the high salinity, fluidity and temperature change of seawater, so that a large amount of corrosion products can be generated more rapidly. At the same time, the abundant microorganisms and suspended matters in the seawater can also adhere to the surface of the anode and be mixed with corrosion products, so that thickening and hardening of the crust are further promoted. The crust can prevent the anode from being in direct contact with the electrolyte, reduce the current output efficiency, even lead to anode failure and lose the protection effect. After the surface of the sacrificial anode material forms a crust, tools such as a scraper and the like are required to be used for manual cleaning at regular intervals. This traditional processing method not only consumes a large amount of manpower and time cost, and very easily causes physical damage to anode material in the clearance in-process, leads to appearing the mar, sunken on anode surface, destroys its structural integrity, and then weakens the electrochemical performance of material, makes anode material fail in advance even, can't continue to exert the guard action, seriously influences sacrificial anode protection system's stability and economic nature. Most scholars now focus on finding anode materials suitable for dry-wet alternative environments and comparing the dry-wet alternative environment resistance of each anode material. The related papers record that through carrying out electrochemical impedance spectrum analysis on 4 widely used sacrificial anodes, by simulating a sea water/ocean atmosphere dry-wet alternating environment, the change rule of working potential, the change rule of current, the morphology of dissolved products and the composition of products of four typical sacrificial anodes are researched, namely (1) a Zn-Al-Cd ternary zinc alloy anode, (2) an Al-Zn-In-Cd aluminum alloy sacrificial anode, (3) an Al-Zn-In-Mg-Ti high-efficiency aluminum alloy sacrificial anode and (4) an Al-Zn-In-Mg-Ga-Mn high-activity aluminum alloy sacrificial anode, which are used for researching ideal anode materials under the dry-wet alternating environment, and the results show that the Al-Zn-In-Mg-Ga-Mn is the sacrificial anode which is most suitable for cathodic protection under the dry-wet alternating condition In the 4 anodes. However, the surface crusting of the sacrificial anode is an unavoidable byproduct in the electrochemi