CN101804401A - Painting method of seawater ballast tank - Google Patents
Painting method of seawater ballast tank Download PDFInfo
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- CN101804401A CN101804401A CN201010133956A CN201010133956A CN101804401A CN 101804401 A CN101804401 A CN 101804401A CN 201010133956 A CN201010133956 A CN 201010133956A CN 201010133956 A CN201010133956 A CN 201010133956A CN 101804401 A CN101804401 A CN 101804401A
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Abstract
The invention discloses a painting method of a seawater ballast tank, which comprises the following steps: a, the surface treatment of a steel plate; b, coating requirements and the selection of coating materials: using epoxy coating materials which pass the qualification test according to the IMO requirements, using a color-contrasted multi-layer coating system, enabling the finish coating to be a light-colored one, and enabling the total dry film thickness of the coating to reach NDFT320 mu m in the 90/10 principle; c, painting: painting under the climatic conditions of 5-30 DEG C and relative humidity below 85% when the temperature of the steel plate is 3 DEG C higher than a dew point; and d, inspecting: inspecting the surface of the steel plate before painting, and inspecting the quality and the thickness of the coating in and after the painting process, wherein dust on the surface is controlled to be at dust distribution of level one and particle size of '3', '4' or '5', the soluble salt content is controlled to be below 50mg/m<2>, and the roughness is controlled to be 35-75 mu m. By using the painting method, the coating of the seawater ballast tank is expected to reach the target service life of 15 years so as to meet the requirements of the PSPC standard, thereby enabling an enterprise to be more competitive in the market.
Description
Technical field
The present invention relates to a kind of coating process of seawater ballast tank, especially a kind of can be reach the coating process of the seawater ballast tank for 15 years.
Background technology
Because the corrosion condition of seawater ballast tank, the navigation safety of serious threat boats and ships and structural safety, International Maritime Organization (IMO) more and more payes attention to the performance and the quality of ballast tank coating, issued " ballast tank of ship protective finish performance standard " (PSPC), the target of coating is fixed by 15 years service life, however the coating that at present a lot of shipyard is used for ballast tank is generally soft dark coating such as tar epoxy; Priming paint not through and follow-up main coating between matching test; General build is 250-300 μ m; The not requirement of defining surface defect processing on the technology, actual state have only reached the P1 requirement of ISO 8501-3 standard class; The processing rank at big seam and damaged position is 3 grades of St, and the destruction amount is about about 40% of segmented general area; Actual coating has only the service life of 3-5, does not reach the requirement of PSPC standard far away.
The ability that coat system reaches its target service life depends on type, steel processing, application and the coating inspection and the maintenance of coat system, and all these aspects are all influential to the premium properties of coat system.In order to reach the requirement of PSPC standard, be badly in need of having the application techniques of reasonable science, make the coating of seawater ballast tank can reach the target service life in 15 years.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of coating life that can make seawater ballast tank to reach the coating process of the seawater ballast tank in 15 years at prior art.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of coating process of seawater ballast tank is characterized in that may further comprise the steps:
A, surface preparation: comprise the dedusting, oil removing, rust cleaning of steel surface and blemish handle, scribble the surface of steel plate of shop primer is handled, segmented surface is handled and close up after surface treatment;
B, coating require and coating is selected
The coat system of ballast tank is a hard coat, and coating is selected for use by the epoxy resin coating of IMO requirement through test; Adopt the multiple tracks coat system of contrast color; Finishing coat is light coating; The dry film gross thickness of coating reaches NDFT320 μ m in principle 90/10; (NDFT is nominal build, and 90/10 rule means 90% measurement result of all measurement points should be more than or equal to NDFT, and remaining 10% measurement result all should be not less than 0.9 * NDFT)
C, application
Be coated be contained in more than 5 ℃, in the weather conditions of relative humidity below 85% and be higher than dew point at steel billet temperature and carry out for 3 ℃; Select suitable paint for use according to construction requirement, and stir evenly the back filtration, adopt brushing, roller coating or spraying method to carry out application; Will carry out precoating earlier for rough surface, edge, bent angle, weld seam and cut channel projection, the method for brushing or roller coating is adopted in precoating;
D, check
Before the application, surface of steel plate is tested, surface dirt be controlled at granular size be ' 3 ', ' 4 ' or ' 5 ' 1 grade of dust abundance, soluble-salt content is controlled at 50mg/m2 following (being equivalent to sodium chloride); Roughness is controlled at 35～75 μ m; Want the periodic inspection coating quality in the application, the test wet-film thickness will check soluble-salt content to be controlled at below the 50mg/m2 during segmentation application; Check coating quality and build after the application; Will carry out recoat as disqualified upon inspection handles;
To monitor surface of steel plate temperature, relative humidity and dew point at paint coating and cure stage, and carry out record; Coating inspector should have NACE II level coating inspector qualification, FROSIO III level testing person's qualification or equivalent qualification (above-mentioned two kinds of qualifications are known standard).
As improvement, described blemish is treated to the removal burr, and the polishing bead is removed spatter thing and any other surface contaminant, makes it to reach ISO8501-3 grade P2.The application leading edge or be processed into radius be at least 2mm fillet or through three times the polishing, or pass through at least the equivalence processing.
As improvement, it is process coating verification of conformity trial test earlier that the described surface of steel plate that scribbles shop primer is handled, and qualify keeps complete shop primer, and carries out the method cleaning of swipe sandblast, high-pressure washing or equivalence; Prove defectively, priming paint will be removed more than 70%, reaches Sa 2, reach the requirement of rust cleaning quality after, the application first road antirust paint.
As improvement, the ruined shop primer of described segmented surface processing requirements and weld seam are handled and are reached Sa2.5, and the surface treatment after described closing up requires: big seam St 3 (St wherein is known standard), or better, or Sa 2.5 when feasible; The small size destroyed area is not more than 2% o'clock of the gross area: St3; The area of the destroyed area that adjoins surpasses 25m2 or surpasses the cabin gross area 2%, should adopt Sa2.5.
As improvement, it is to remove impurity such as the salt that is attached to coating surface, greasy, dirt earlier that the described surface of steel plate that scribbles paint is handled, and wash with clear water, wipe up with solvent again, for the paint film bubble place that comes off and get rusty, with road paint after the application again after the polishings such as garden disk sander or elastic grinding wheel sheet.
Improve, described coating process adopts when brushing again, and the brushing direction should be got earlier up and down the direction about the back and be carried out application, and brushing dipping can not be too much in case drip; Painting brush distance is can not La Detai big in order to avoid coat with lacquer lepthymenia when application marine paint or heavy-duty anticorrosive coating; Meet parts such as rough surface, edge, bent angle and protrusion and more should be specifically noted that, preferably first precoating together.
Improve, when described coating process adopted roller coating, the paint that is dipped on the cylinder should be evenly distributed again, rolling speed will keep necessarily during application, can not be too fast, and must guard against dividing potential drop and ground cylinder, for projections such as weld seam, cut channels, outstanding care should be used to is handled, and preferably first precoating together.
Improve again, when described coating process adopts spraying, adopt earlier up and down about the back, or back spraying method in length and breadth up and down earlier; Spray gun and coated article face should maintain on the horizontal range, will prevent during operation that spray gun from doing brandishing of remote or arc.
At last, described application is a multiple coating, and overlay painting interval is decided according to the requirement of coating, is controlled in the longest blanking time of specification requirement.
Compared with prior art, the invention has the advantages that: adopt by the epoxy resin coating of IMO requirement through test, dust, the soluble-salt restriction on strict control application front spring surface, the requirement of defining surface defect processing, the dried thickness of coating is 320 μ m: ruined shop primer and weld seam are handled and are reached Sa2.5; Shop primer is by coating verification of conformity trial test; Painting work carries out under controlled humidity and surface temperature condition; Strengthen segmentation and close up after surface treatment and coating protection, damaged area greatly reduces; Can make the coating of seawater ballast tank estimate to reach the target service life in 15 years by this coating process, reach the requirement of PSPC standard, make enterprise on market, have more competitiveness.
The specific embodiment
The invention will be further described below in conjunction with embodiment.
The coating process of present embodiment comprises the steps: a, surface treatment: comprise that the surface of steel plate processing and the segmentation of shop primer are handled, scribbled to the dedusting, oil removing, rust cleaning of steel surface and blemish, the surface of steel plate after closing up is handled; B, coating are selected and coating requires: coating is selected for use by the epoxy resin coating of IMO requirement through test; The coat system of ballast tank is a hard coat, adopts the multiple tracks coat system of contrast color; Finishing coat is light coating; The dry film gross thickness of coating reaches NDFT320 μ m, (being known standard) in principle in 90/10 (referring to that the lattice rate reaches 90%); C, application: be coated with to be contained in 5 ℃～30 ℃, the weather conditions of relative humidity below 85% and to be higher than dew point and carry out for 3 ℃ at steel billet temperature; Select suitable paint for use according to construction requirement, and stir evenly the back filtration, adopt brushing, roller coating or spraying method to carry out application; Will carry out precoating earlier for rough surface, edge, bent angle, weld seam and cut channel projection, the method for brushing or roller coating is adopted in precoating; D, check: before the application, check the surface of steel plate situation, with dust be controlled at granular size be ' 3 ', ' 4 ' or ' 5 ' 1 grade of dust abundance, soluble-salt content is controlled at below the 50mg/m2 (being equivalent to sodium chloride); Roughness is controlled at 35～75 μ m; Want the periodic inspection coating quality in the application, the test wet-film thickness will check soluble-salt content to be controlled at below the 50mg/m2 during segmentation application, checks coating quality and build after the application; Find that coating quality is defective and will carry out recoat; Coating inspector should have NACE II level coating inspector qualification, FROSIO III level testing person's qualification or equivalent qualification.
The surface treatment concrete steps of steel plate are:
1, the preliminary treatment of steel surface
1-1 removes the impurity that is attached to surface of steel plate, removes dirts such as degrease with dilution or cleaning agent.
1-2 should clean with clear water if any sulfate or corrosivity salt, dries up with compressed air.
The 1-3 blemish is handled: remove burr, the polishing bead is removed spatter thing and any other surface contaminant, makes it to reach ISO8501-3 grade P2 (known international standard).The application leading edge should be processed into radius be at least 2mm fillet or through three times the polishing, or pass through at least the equivalence processing
In rust cleaning after quality reaches requirement, one shop primer of application immediately is in case storing, when assembling coating process light plate gets rusty, and protecting the surface of steel plate for road antirust paint after the application for pretreated steel.
2, the surface of steel plate that scribbles shop primer is handled
If the Bulk coat system that is made up of the main coating and the shop primer of epoxy radicals has passed through the verification of conformity trial test by test procedure, then when using same epoxy coating system, can keep complete shop primer.The shop primer that keeps is used the method cleaning of swipe sandblast, high-pressure washing or equivalence.Ruined shop primer and weld seam are handled and are reached Sa2.5 (Sa wherein is known standard); Press test procedure not by coating verification of conformity trial test as shop primer, complete priming paint will remove 70% at least, reaches Sa 2.
3, ruined shop primer of segmented surface processing requirements and weld seam are handled and to be reached Sa2.5, and the surface treatment after described closing up requires: big seam St 3, or better, or Sa2.5 when feasible.The small size destroyed area is not more than 2% o'clock of the gross area: St3.The area of the destroyed area that adjoins surpasses 25m2 or surpasses the cabin gross area 2%, should adopt Sa2.5.
4, surface-treated standard and requirement
4-1 is in order to control the rust cleaning quality of surface of steel plate, to meet the requirement of various types of coatings, the rust cleaning standard that a lot of countries have all worked out metal materials such as iron and steel.What the most generally adopt in the world at present is the SIS05900-1967 standard " diagram of painted steel sheet surface treatment standard " (PrctorialSurface Preparation Standard or Painting Steel Surface) that Sweden corrosion association (SwedishCorrosion lnstitute) publishes.China has also issued the GB8923-88 equivalent with it " steel surface rusting grade and derusting grade " national standard in 1988.
The rust cleaning requirement of shop primer that 4-2 is different and ship bottom anticorrosion paint or heavy-duty anticorrosive coating.
4-3 shot-peening or derusting by sandblasting make steel surface form certain roughness, can improve paint film adhesion.Generally be advisable to be controlled at 35-75um, maximal roughness does not wish to surpass 100um.If surface roughness is too big, not only too much paint to be consumed, but also bubble might be below paint film, held back, perhaps take place not by the topped crest of living of paint film.
The size of surface roughness depends on the factors such as granularity, shape, material and jet velocity of abrasive material.Wherein the granularity of abrasive material is bigger to the roughness influence.For making maximal roughness be no more than 100um, shot-peening or sandblast are advisable with 0.8-1.2mm with the particle diameter of compound abrasive.Surface roughness can be measured or relatively with methods such as the talysurf of contact pin type or standard sample compare.
The operation of coating process requires concrete steps to be:
1, weather conditions
Atmospheric environment when the principal element that notes when 1-1 application marine paint or heavy-duty anticorrosive coating is surface of steel plate situation, steel billet temperature and application.Usually painting work should be more than 5 ℃, carry out in the weather conditions of relative humidity below 85%.And when the surface is subjected to influencing of rainwater, dense fog or ice and snow, then can not carry out application.
1-2 measures steel billet temperature with land surface pyrometer, measures relative humidity, measures dew point with the dew point analyzer with hygrometer.More than being lower than dew point, steel billet temperature 3 ℃ the time,, must be higher than 3 ℃ of ability constructions of dew point because surface condensation moisture content is not answered application.
After ship lies up sometimes steel billet temperature near dew point, application immediately.But under special circumstances, when having to carry out painting work, use to brush or the roller coating method, lip-deep moisture content is sneaked in the paint and can obtain adhesive force preferably in time undocking.As using airless spraying in this case, the paint film that sprays up is attached on the moisture content, the consequence that will cause large tracts of land to come off.
1-3 is under temperature is cryogenic conditions below 5 ℃.Because the curing rate of epoxy type and epoxy anti-rust paint slows down greatly, even stop to solidify, thereby can not construct.Can select for use the winter of energy low-temperature setting to use the type epoxy coating, also can in being provided with the application workshop of heat riser, carry out the segmentation application.Or select for use at chlorinated rubber type antirust paint that also can be dry below-10 ℃.
When 1-4 constructed under temperature is mal-condition more than 30 ℃, solvent evaporates was very fast, when airless spraying, and a large amount of volatilizations and form to do and spray between spray gun and coated article face of the solvent in the paint.For avoiding doing spray, should as far as possible vertically spray simultaneously with spray gun as far as possible near object plane, as when taking still to occur doing the spray phenomenon after this measure, can add 5% release rare dose and dilute and solved that is not more than the paint own wt.
2, application mode
2-1 brushes
During with the painting brush application, the brushing direction should be got first direction about the back up and down and be carried out application, and brushing dipping can not be too much in case drippage.Painting brush distance is can not La Detai big in order to avoid coat with lacquer lepthymenia when application marine paint or heavy-duty anticorrosive coating.Meet parts such as rough surface, edge, bent angle and protrusion and more should be specifically noted that, preferably first precoating together.
The 2-2 roller coating
When using barrel enamelling, the paint that is dipped on the cylinder should be evenly distributed.Rolling speed will keep necessarily during application, can not be too fast.Must guard against dividing potential drop and ground cylinder.For projections such as weld seam, cut channels, outstanding care should be used to is handled, and preferably first precoating together.
The 2-3 airless spraying
This is the fastest coating process, and can obtain very thick paint film, and the build in the specification is airless spraying thickness together.Therefore, in order to reach the film thickness of regulation, preferably adopt the construction method of airless spraying.About after when actual application, should adopting elder generation up and down, or back spraying method in length and breadth up and down earlier.Use airless spraying to need higher skill seven, spray gun and coated article face should maintain on the horizontal range, will prevent during operation that spray gun from doing at a distance or the brandishing of arc.
3, the control of film thickness
In order to make marine paint or heavy-duty anticorrosive coating can bring into play the performance of its optimal period, enough film thicknesses are extremely important.Therefore, must the strict thickness of controlling paint film.
The per pass film thickness that obtains with painting brush or barrel enamelling is thinner, and its application road number is Duoed one times than the spraying road number of airless spraying at least, just can reach the thickness of defined.
For positions such as limit, angle, weld seam, cut channels, before spraying, should brush in advance together, and then carry out large-area application, to guarantee to protrude the film thickness at position.
Should carry out application by use amount during construction, often use wet film thickness gauge to measure wet paint film thickness, with the thickness of control dry paint and guarantee coating layer thickness evenly.
Determine the density and the distribution of thickness measure point by the size of coated article body, measure dry paint thickness then.Film thickness does not reach requirement place, must carry out being coated with.
4, overlay painting interval
Its overlay painting interval of dissimilar coating is had nothing in common with each other, and should construct by the requirement separately of every kind of coating when construction.What will emphatically point out especially is high build epoxy bituminous anti-corrosive paint, epoxy finish, and its overlay painting interval time can not surpass the longest blanking time in the explanation, otherwise will influence the adhesive force between paint film layer and the layer, and causes peeling off of paint film.If epoxy type coating has surpassed the longest blanking time in work progress, before the application of playing paint, ability able one painting operation after palpus uses power emery wheel skin machine with the paint film hacking.
5, use amount
Use amount in this specification is a theoretical value, is meant under desirable condition, when the film thickness uniformity, calculates the paint consumption of the unit are that gets by theory.And the actual consumption that paints during application, be by the thickness of paint film, the loss during application, coating process, the situation such as coarse of coated article face differs greatly as situation how and decide.In the actual consumption of estimating paint, the paint consumption of the 50-80% that generally should outside theoretical use amount, add again.
Claims (7)
1. the coating process of a seawater ballast tank is characterized in that may further comprise the steps:
A, surface treatment: comprise the dedusting, oil removing, local sandblast, rust cleaning of steel surface and blemish handle, scribble the surface of steel plate of shop primer is handled, segmented surface is handled and close up after surface treatment;
B, coating require and coating is selected:
Coating is selected for use by the epoxy resin coating of International Maritime Organization's requirement through test; The coat system of ballast tank is a hard coat, adopts the multiple tracks coat system of contrast color; Finishing coat is light coating; The dry film gross thickness of coating reaches 320 μ m at 90% measurement point;
C, application:
Be coated be contained in more than 5 ℃, in the weather conditions of relative humidity below 85% and be higher than dew point at steel billet temperature and carry out for 3 ℃; According to construction requirement preparation coating, and stir evenly the back filtration, adopt brushing, roller coating or spraying method to carry out application; Will carry out precoating earlier for rough surface, edge, bent angle, weld seam and cut channel projection, the method for brushing or roller coating is adopted in precoating;
D, check:
Before the application, surface of steel plate is tested, surface dirt be controlled at granular size be ' 3 ', ' 4 ' or ' 5 ' 1 grade of dust abundance, soluble-salt content is controlled at below the 50mg/m2; Roughness is controlled at 35～75 μ m; Want the periodic inspection coating quality in the application, the test wet-film thickness will check soluble-salt content to be controlled at below the 50mg/m2 during segmentation application; Check coating quality and build after the application.
2. coating process according to claim 1 is characterized in that: described blemish is treated to the removal burr, and the polishing bead is removed spatter thing and any other surface contaminant, makes it to reach ISO8501-3 grade P2; The application leading edge be processed into radius be at least 2mm fillet or through three times the polishing, or pass through at least the equivalence processing.
3. coating process according to claim 1, it is characterized in that: it is earlier through coating verification of conformity trial test that the described surface of steel plate that scribbles shop primer is handled, qualify keeps complete shop primer, and carries out the method cleaning of swipe sandblast, high-pressure washing or equivalence; Prove defectively, priming paint will be removed more than 70%, reaches Sa2, reach the requirement of rust cleaning quality after, the application first road antirust paint.
4. coating process according to claim 1 is characterized in that: described segmented surface is treated to and requires ruined shop primer and weld seam to handle to reach Sa2.5, and the surface treatment after described closing up requires to be big seam St3 or Sa 2.5 when feasible at least; The small size destroyed area is not more than 2% o'clock St3 of the gross area; The area of the destroyed area that adjoins is Sa2.5 when surpassing 25m2 or surpassing the cabin gross area 2%.
5. according to the described coating process of arbitrary claim among the claim 1-4, it is characterized in that: described coating process adopts when brushing, and the brushing direction should be got earlier up and down the direction about the back and be carried out application, and brushing dipping can not be too much in case drip; Painting brush distance is can not La Detai big in order to avoid coat with lacquer lepthymenia when application marine paint or heavy-duty anticorrosive coating; Meet rough surface, edge, bent angle and want first precoating with projection.
6. according to the described coating process of arbitrary claim among the claim 1-4, it is characterized in that: when described coating process adopted roller coating, the paint that is dipped on the cylinder should be evenly distributed; Rolling speed will keep certain during application; Must guard against dividing potential drop and ground cylinder; Want first precoating together for weld seam, cut channel projection.
7. according to the described coating process of arbitrary claim among the claim 1-4, it is characterized in that: when described coating process adopts spraying, adopt earlier up and down about the back or back spraying method in length and breadth up and down earlier, spray gun and coated article face should maintain on the horizontal range, will avoid spray gun to do brandishing of remote or arc during operation.
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| CN103433183A (en) * | 2013-09-03 | 2013-12-11 | 中海工业(江苏)有限公司 | Coating method capable of avoiding paint mist ripples of ship shell plate |
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Application publication date: 20100818 |