CN111284650A - Method for repairing corrosion defect of hull deck - Google Patents
Method for repairing corrosion defect of hull deck Download PDFInfo
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- CN111284650A CN111284650A CN201811499518.9A CN201811499518A CN111284650A CN 111284650 A CN111284650 A CN 111284650A CN 201811499518 A CN201811499518 A CN 201811499518A CN 111284650 A CN111284650 A CN 111284650A
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- deck
- ship
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- hull
- coating
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Abstract
The invention discloses a method for repairing corrosion defects of a hull deck, which is characterized by comprising the following steps: the method comprises the following steps: step one, detecting a ship deck needing to be repaired; step two, cleaning the ship deck by using a cleaning agent; removing rust spots on the deck; step four, treating the hull deck after rust removal, and purging with gas; fifthly, sealing the deck of the ship body by using a plastic bag, and performing pressure detection after sealing is finished; step six, introducing nitrogen into the plastic bag through an inflation valve, and maintaining for 5-6 hours; then, air is discharged through an air discharge valve; step seven, dismantling the plastic bag and applying a layer of coating on the deck; step eight, after the coating of the step seven is dried, applying a layer of asphalt on the coating; and (5) drying. The method can effectively identify the corrosion sites of the deck, and after the repair by the method, the ship has effective corrosion resistance in the deep sea, so that the running safety of the ship is improved.
Description
Technical Field
The invention relates to the technical field of repair of ship accessories, in particular to a method for repairing corrosion defects of a hull deck.
Background
The portion above the water in the hull mainly includes superstructures, deck and freeboard. The above-water parts of the ship body are mainly influenced by rain and snow, seawater spray and sea atmosphere at ordinary times, and the factors are important causes for serious corrosion of the above-water parts of the ship body. In the marine atmosphere there is usually a large amount of nitride, which causes the condensate to exacerbate the damage to the hull structure. On the other hand, the surface temperatures of the cabin and the boiler in the deck are relatively high, thus increasing to some extent the water hazard in these areas.
Different ship hulls may have different levels of corrosion in their interior compartments due to different conditions of use. For example, the corrosion of the working and living compartments is generally relatively light and no relatively visible corrosion marks are visible. But in the sanitary compartment, there is a severe corrosion phenomenon. In the cargo hold of a ship hull, the coating in the cargo hold structure is more susceptible to damage due to the frequent loading and unloading of cargo, while also having the dual function of water and condensate accumulation. The destruction of the coating in the cargo space tends to accelerate the corrosion of the interior floors and walls of the cargo space in the hull. In addition, the corrosion of the tanks in the hull is severe. The ballast tanks and fresh water tanks are coated with cement, but the cement coating has instability and water permeability, so that the corrosion of the water tanks of the ship body is difficult to inhibit.
There is also corrosion in the hull, which is galvanic corrosion, which is generally mainly due to the hull being repaired while floating or when installed at a dock because the power supply lines are not wired in the right way. Stray currents are generated in the water area where the hull is parked. This results in a relatively severe galvanic corrosion.
The applicant designs a repairing method for corrosion defects of ship decks through research and development.
Disclosure of Invention
The invention aims to provide a method for repairing corrosion defects of a hull deck. The method can effectively identify the corrosion sites of the deck, and after the repair by the method, the ship has effective corrosion resistance in the deep sea, so that the running safety of the ship is improved.
The invention is realized by the following technical scheme: a method for repairing corrosion defects of a ship deck comprises the following steps:
firstly, detecting a hull deck to be repaired, performing surface pretreatment on a corrosion defect part, and scraping the corrosion on the deck;
step two, cleaning the ship deck by using a cleaning agent;
thirdly, removing rust spots on the deck by using a mechanical method;
step four, treating the hull deck after rust removal, and purging with gas;
fifthly, sealing the deck of the ship body by using a plastic bag with an inflation valve and an air release valve, and performing pressure detection after sealing is finished to ensure that no air leakage exists in a sealing area;
step six, introducing nitrogen into the plastic bag through an inflation valve, and maintaining for 5-6 hours; then, air is discharged through an air discharge valve;
seventhly, dismantling the plastic bag, and applying a layer of coating on the deck, wherein the thickness of the coating is 1-2 cm
Step eight, after the coating of the step seven is dried, applying a layer of asphalt on the coating; and (5) drying.
In a further technical scheme, in the second step, the cleaning frequency of the cleaning agent is at least three times.
In a further technical scheme, in the fourth step, the purge gas is low-temperature nitrogen.
In a further technical solution, before the first step, the hull deck is identified by the following corrosion defect identification device, and the corrosion defect identification device includes: the detection unit acquires corrosion defect data of a hull deck through a probe; the processing unit is used for determining the safe working pressure of the defects according to the corrosion defect data acquired by the detection unit; and if the safe working pressure of the defect is greater than the maximum allowable working pressure, determining the safe maintenance time limit of the ship body deck according to the safe working pressure.
Compared with the prior art, the invention has the following advantages and beneficial effects: the method can effectively identify the corrosion sites of the deck, and after the repair by the method, the ship has effective corrosion resistance in the deep sea, so that the running safety of the ship is improved.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1: a method for repairing corrosion defects of a ship deck comprises the following steps:
firstly, detecting a hull deck to be repaired, performing surface pretreatment on a corrosion defect part, and scraping the corrosion on the deck;
step two, cleaning the ship deck by using a cleaning agent;
thirdly, removing rust spots on the deck by using a mechanical method;
step four, treating the hull deck after rust removal, and purging with gas;
fifthly, sealing the deck of the ship body by using a plastic bag with an inflation valve and an air release valve, and performing pressure detection after sealing is finished to ensure that no air leakage exists in a sealing area; the plastic bag is a special double-layer film, and an operable inflation valve and an air release valve are arranged on the film.
Step six, introducing nitrogen into the plastic bag through an inflation valve, and maintaining for 5-6 hours; then, air is discharged through an air discharge valve;
removing the plastic bag, and applying a layer of coating on the deck, wherein the thickness of the coating is 1-2 cm; the coating is an anti-corrosion coating;
step eight, after the coating of the step seven is dried, applying a layer of asphalt on the coating; and (5) drying.
In the second step, the cleaning frequency of the cleaning agent is at least three times.
In the fourth step, the purge gas is low-temperature nitrogen.
Example 2
This embodiment is further optimized on the basis of embodiment 1, wherein the hull deck is identified by the following corrosion defect identification device before the step one, and the corrosion defect identification device comprises: the detection unit acquires corrosion defect data of a hull deck through a probe; the processing unit is used for determining the safe working pressure of the defects according to the corrosion defect data acquired by the detection unit; and if the safe working pressure of the defect is greater than the maximum allowable working pressure, determining the safe maintenance time limit of the ship body deck according to the safe working pressure.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (4)
1. A method for repairing corrosion defects of ship decks is characterized by comprising the following steps: the method comprises the following steps:
firstly, detecting a hull deck to be repaired, performing surface pretreatment on a corrosion defect part, and scraping the corrosion on the deck;
step two, cleaning the ship deck by using a cleaning agent;
thirdly, removing rust spots on the deck by using a mechanical method;
step four, treating the hull deck after rust removal, and purging with gas;
fifthly, sealing the deck of the ship body by using a plastic bag with an inflation valve and an air release valve, and performing pressure detection after sealing is finished to ensure that no air leakage exists in a sealing area;
step six, introducing nitrogen into the plastic bag through an inflation valve, and maintaining for 5-6 hours; then, air is discharged through an air discharge valve;
removing the plastic bag, and applying a layer of coating on the deck, wherein the thickness of the coating is 1-2 cm;
step eight, after the coating of the step seven is dried, applying a layer of asphalt on the coating; and (5) drying.
2. The method for repairing the corrosion defect of the deck of the ship hull according to claim 1, wherein the method comprises the following steps: in the second step, the cleaning frequency of the cleaning agent is at least three times.
3. The method for repairing the corrosion defect of the deck of the ship hull according to claim 2, wherein the method comprises the following steps: in the fourth step, the purge gas is low-temperature nitrogen.
4. A method for identifying corrosion defects in the decks of ship hulls according to claim 1, wherein: the hull deck is identified by the following corrosion defect identification device before the first step, and the corrosion defect identification device comprises: the detection unit is used for acquiring corrosion defect data of a ship deck; the processing unit is used for determining the safe working pressure of the defect according to the corrosion defect data; and if the safe working pressure of the defect is greater than the maximum allowable operating pressure, determining the safe maintenance time limit of the ship body deck according to the safe working pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811499518.9A CN111284650A (en) | 2018-12-09 | 2018-12-09 | Method for repairing corrosion defect of hull deck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811499518.9A CN111284650A (en) | 2018-12-09 | 2018-12-09 | Method for repairing corrosion defect of hull deck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111284650A true CN111284650A (en) | 2020-06-16 |
Family
ID=71029291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811499518.9A Pending CN111284650A (en) | 2018-12-09 | 2018-12-09 | Method for repairing corrosion defect of hull deck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111284650A (en) |
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2018
- 2018-12-09 CN CN201811499518.9A patent/CN111284650A/en active Pending
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Legal Events
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200616 |
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| WD01 | Invention patent application deemed withdrawn after publication |