CN112246580A - Coating process of wear-resistant and corrosion-resistant paint - Google Patents
Coating process of wear-resistant and corrosion-resistant paint Download PDFInfo
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- CN112246580A CN112246580A CN202011143774.1A CN202011143774A CN112246580A CN 112246580 A CN112246580 A CN 112246580A CN 202011143774 A CN202011143774 A CN 202011143774A CN 112246580 A CN112246580 A CN 112246580A
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- 238000000576 coating method Methods 0.000 title claims abstract description 93
- 230000007797 corrosion Effects 0.000 title claims abstract description 18
- 238000005260 corrosion Methods 0.000 title claims abstract description 18
- 239000003973 paint Substances 0.000 title claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 71
- 238000005488 sandblasting Methods 0.000 claims abstract description 17
- 238000007689 inspection Methods 0.000 claims abstract description 8
- 239000005002 finish coating Substances 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 238000011179 visual inspection Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- 238000010892 electric spark Methods 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 230000004927 fusion Effects 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000005536 corrosion prevention Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 14
- 238000005202 decontamination Methods 0.000 abstract description 4
- 230000003588 decontaminative effect Effects 0.000 abstract description 4
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- 238000010924 continuous production Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 4
- 239000010431 corundum Substances 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000003860 storage Methods 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/007—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to a coating process of a wear-resistant and corrosion-resistant coating, which comprises the following steps: step (1), finishing the surface of a workpiece; step (2), performing sand blasting and decontamination on the workpiece; step (3), preheating the workpiece; step (4), coating the workpiece paint; and (5) curing the workpiece coating to finish coating the workpiece. According to the method, high-standard products are obtained through surface finishing, sand blasting decontamination, preheating treatment, coating curing and quality inspection in sequence, and the whole process is simple to operate. The process is simple to operate and easy to master, can realize continuous production, and improves the production efficiency. The process is clear, the parameters are fixed, the probability of product scrapping caused by misoperation is reduced, the product percent of pass is indirectly ensured, and the cost is reduced.
Description
Technical Field
The invention relates to a coating process of a wear-resistant and corrosion-resistant coating.
Background
Along with the continuous expansion of the application field, the requirements and changes of human beings on the development environment, and higher requirements are put forward on the production process of the wear-resistant and corrosion-resistant coating. The invention provides a coating process of a wear-resistant and corrosion-resistant coating, aiming at solving the process quality problems that a pipe fitting process is complex, a coating is easy to generate bubbling and dropping, the adhesive force cannot meet the corresponding standard requirement, the spraying uniformity is poor and the like.
Disclosure of Invention
The invention aims to solve the problems and provide a coating process of a wear-resistant and corrosion-resistant coating.
The invention aims to realize the technical scheme that a wear-resistant corrosion-resistant coating process is characterized by comprising the following steps of:
step (1), finishing the surface of a workpiece;
step (2), performing sand blasting on the workpiece to remove dirt;
step (3), preheating the workpiece;
step (4), coating the workpiece paint;
and (5) curing the workpiece coating to finish coating the workpiece.
In the step (1), when the workpiece is a welded part, the surface of the welding seam is polished to be flat and smooth; when the workpiece is an iron casting, the surface of the workpiece is smooth and flat without air holes, shrinkage cavities, bonded sand and burrs.
In the step (2), the surface of the workpiece is subjected to surface treatment of water removal, oil removal, dirt removal, spot removal, rust removal and scale removal.
The baking temperature of the water and oil removing treatment in the furnace is 270 ℃, the heating rate is not lower than 8 ℃/S, and the heat preservation time is 60 minutes or more; when the workpiece is a welding piece, a steel pipe or a steel piece, the baking temperature of the workpiece in the furnace for dewatering and deoiling is 250 ℃, and the heat preservation time is 40 to 60 minutes.
Selecting 10-20 meshes of quartz sand or corundum as a sand blasting material, and using the quartz sand or the corundum singly or in a mixed way, wherein the quartz sand or the corundum is dried, clean and free of dust and impurities; and (3) carrying out sand blasting treatment on the workpiece by using a sand blasting material, wherein the surface roughness of the treated workpiece reaches Sa2.5 grade, the natural color of the exposed metal is uniform, and the surface anchorage degree is 20-80 mu m.
In the step (3), the preheating temperature is strictly controlled within the range of 240-270 ℃, the preheating temperature is controlled at the upper limit for the workpieces such as pumps, machines and valves which are in service in heavy corrosion media, and the preheating temperature can be controlled at the lower limit for the internal and external corrosion protection of the workpieces such as pipelines.
In the step (4), coating the workpiece with a spray gun, controlling the air pressure of the spray gun to be more than 0.5Mpa, adjusting the high voltage of the spray gun to be 50-80 KV, controlling the current to be 300 mu m correspondingly, controlling the distance between the spray gun and the workpiece to be 80-150 mm, uniformly spraying, and ensuring the thickness of the coating to be 1-2 mm; the sprayed coating is a fusion bonded epoxy thermosetting powder coating.
In the step (5), the curing temperature of the coating is controlled to be 180-240 ℃, and the curing time is controlled to be 30-60 min.
Further comprises the step (6) of quality inspection; the quality detection of the workpiece is as follows:
a) the appearance requirement is as follows: visual inspection or visual inspection is used, and the coating is required to be flat in surface, uniform in color, free of bubbles, cracks and shrinkage cavities and allowed to have slight orange-peel patterns;
b) the thickness requirement is as follows:
1) measuring by using a coating thickness gauge, wherein the number of detection points in each square meter is not less than 25, finding out the maximum value and the minimum value of the coating thickness of all monitoring points, and calculating an average value;
2) for the machined surface, the thickness is less than the set value and needs to be sprayed again or supplemented, and for the non-machined surface, the number of detection points with the thickness less than the set value is more than 30 percent and needs to be sprayed again or supplemented;
c) leak (pinhole) detection: and (3) detecting the leakage points by using an electric spark pinhole detector, wherein the detection voltage needs to exceed 4V/mum, the surface temperature of the coating is not higher than 100 ℃ during detection, and when the leakage points are found, repairing or re-spraying is carried out.
And (7) packaging the qualified workpieces after quality inspection, and delivering the packaged workpieces to a factory to establish documents.
The method of the invention is advanced and scientific, and the paint is fused epoxy thermosetting powder paint. The solid powder has no flux, no pollution, convenient storage and transportation, thermosetting property, and formed firm protecting layer on the surface of the material after spraying, and can resist the serious corrosion of various media and smoke, and has the characteristics of wear resistance, drag reduction, cavitation resistance and the like.
According to the technical scheme, the high-standard product is obtained through surface finishing, sand blasting decontamination, preheating treatment, coating curing and quality inspection in sequence, and the whole process is simple to operate.
Compared with the prior art, the invention has the beneficial effects that:
1. the process is simple to operate and easy to master, can realize continuous production, and improves the production efficiency.
2. The process is clear, the parameters are fixed, the probability of product scrapping caused by misoperation is reduced, the product percent of pass is indirectly ensured, and the cost is reduced.
3. The establishment of the process is convenient for recording the coating process and the conditions of all the procedures thereof in detail, lays a foundation for subsequent leakage detection and gap filling, improves the coating process and innovating the hidden pen, and is more beneficial to establishing an information exchange and feedback channel between a production workshop and a user.
Drawings
FIG. 1 is a flow chart of the coating process of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and detailed description, but the scope of the present invention is not limited thereto.
Referring to fig. 1, the invention discloses a coating process of a wear-resistant and corrosion-resistant coating, which comprises the following steps: step 1, surface finishing; step 2, sand blasting and decontamination; step 3, preheating; step 4, coating the paint; step 5, curing the coating; step 6, quality inspection; and 7, packaging qualified products and leaving the factory, and establishing documents.
In the step 1, for a welding part, a welding rod is selected according to the material of a workpiece, the welding rod is dried before being used, the defects of shrinkage cavity, insufficient welding, bubbles and the like generated in welding are prevented, a welding seam of the welding part is smooth, welding and polishing are carried out on a concave part and a convex part, and welding slag is cleaned; for iron castings; the coated surface of the casting should be smooth and flat, and the defects of air holes, shrinkage cavities, bonded sand, burrs and the like cannot exist.
In step 2, surface treatment such as water removal, oil removal, dirt removal, spot removal, rust removal, scale removal and the like is carried out on the surface of the coating piece (workpiece): a) the baking temperature of the casting after dehydration and oil removal treatment in the furnace is 270 ℃, the heating rate is not lower than 8 ℃/s, and the heat preservation time is 60 minutes or more; b) the baking temperature of the weld parts, the steel pipes and the steel parts in the furnace for dewatering and deoiling is 250 ℃, and the heat preservation time is 40 to 60 minutes. After the workpiece is baked out of the furnace, concave and convex points with leakage points are generated, sand and burrs are bonded, and the like are polished, and the right-angle part is polished into a round angle, otherwise, the coating quality is influenced. And protecting the non-coating surface and the threaded hole according to the requirements of drawings or customers.
And then carrying out sand blasting treatment on the surface to be coated, wherein the surface roughness of the treated workpiece reaches Sa2.5 grade, the natural color of the exposed metal is uniform, and the surface anchorage line degree is 20-80 mu m. The sand blasting agent is prepared by selecting 10-20-mesh quartz sand or gold steel sand as a sand blasting material, wherein the two kinds of sand can be used independently or in a mixed manner, and the used sand is dry, clean and free of impurities such as dust. After the sand blasting is finished, the residual sand and ash left on the surface of the workpiece must be blown off by clean (anhydrous and oilless) compressed air, and the steel seal is used for printing a work number. The workpiece after surface treatment is transferred to the next process as soon as possible, preferably not more than 8 hours, and not more than 4 hours in humid weather, otherwise the surface quality of the treated workpiece is affected, and the adhesion quality of the coating layer is affected.
In step 3, the temperature and the heat preservation time of the preheating treatment generally depend on the temperature at which the powder can be melted, and if the temperature is improperly controlled, the defects of coating sagging, deformation, orange peel and the like can occur, so that the coating quality is directly influenced. Therefore, the preheating temperature is strictly controlled within the range of 240-270 ℃ C, the preheating temperature is controlled at the upper limit for pump, machine and valve workpieces serving in a heavy corrosion medium, the preheating temperature is controlled at the lower limit for inner and outer anticorrosive coating of pipelines, and the heat preservation time of small workpieces is about 30 minutes; the heat preservation time of the large workpiece is 60 minutes or more. The phenomenon of overtemperature for a long time or failing to reach the specified temperature is not generated, otherwise, the surface of the workpiece is dark blue or dark brown to generate oxidation, the quality of the coating is influenced, and if the oxidation phenomenon occurs, the sand blasting treatment is carried out again.
Step 4, coating the paint: a) opening a total air source valve and starting the freezing type air dryer; b) opening a dust removal and powder recovery system of the powder spraying room; c) checking the powder containing condition of the powder barrel; d) debugging the spray gun: the air pressure is controlled to be more than 0.5Mpa, the high pressure of the spray gun is adjusted to be 50-80 KV, the current is correspondingly about 300 mu m, and the atomized powder with proper size and uniform powder spraying and conical shape is obtained by adjusting the fluidizing gas, the concentration gas and the powder quantity gas of the powder cylinder and the adjusting valve of the central gas of the spray gun.
Then coating is carried out, and attention needs to be paid in the coating process: a) conveying the workpieces which are preheated and kept warm for a certain time to a powder spraying room; b) blowing clean the surface of the workpiece to be coated by using dry and clean compressed air; detecting the surface temperature of the workpiece by using a far infrared thermometer, and controlling the temperature to be 240-270 ℃; c) starting a spray gun, spraying the surface and the corner which are easy to dissipate heat, and then spraying the part which is slow in heat dissipation and thin in coating requirement; d) the movable spray gun is required to be stably and orderly sprayed uniformly, the distance between the spray gun and the workpiece is controlled to be 80-150 mm, and proper technological parameters of powder spraying are controlled according to the size of the workpiece and the thickness of a coating; e) the powder amount and the spraying frequency of the welding seam of the workpiece are increased, and casting parts with pits, air holes, shrinkage cavities and the like can be leveled up at defective positions by adopting a point-shooting method, so that defects such as air bubbles, pinholes and the like are prevented; f) when the thickness of the metal structural member matrix is small, the heat capacity is small, or when the structure of the workpiece is large, the coating once can not reach the process design thickness, the recoating can be carried out, but the recoating should be carried out before the previous coating is not completely cured.
Finally, recycling the powder, cleaning the recycled powder after finishing coating every day to prevent the powder from being polluted and damped, sieving the recycled powder by using a 100-mesh sieve, and then uniformly stirring the recycled powder by using the same amount of new powder for reuse; the nozzle, and gun cavity must be cleaned with clean, dry compressed air, but care must be taken not to damage the needle-like grill to maintain the gun.
In step 5, curing the coating of the coating piece: a) in the step of workpiece curing, macromolecules in a coating generate chemical polymerization crosslinking reaction under the action of a curing agent under a certain temperature condition, so that the coating has good physical properties, and the curing temperature and the curing time must be strictly controlled; b) the curing temperature of the coating is generally 180-240 ℃, the curing time is generally 30-60 min, and the specific temperature and time depend on the size and thickness of a coating piece, the thickness of a coating and the type of the coating; c) coating personnel should carry out curing operation according to the process parameters determined by the process card; d) in the curing process, the coating cannot be contacted and collided with other objects, otherwise, the surface quality of the coating is influenced; e) after the workpiece is cured and treated, and is taken out of the furnace, a protective layer which is not required to be coated and is additionally arranged on the workpiece is immediately removed when the workpiece is hot, and the surface of the coating cannot be damaged when the protective layer is removed; f) and (4) detecting the impact value of each furnace hanging piece, and if the performance is found to be lower than the quality inspection standard, determining that the furnace solidified workpiece is unqualified. g) Each batch of products should be subjected to three-piece stretching, three-piece shearing resistance and three-piece impact performance test, and each index should be not lower than a specified value;
in step 6, quality detection of the coating piece: a) appearance: inspecting each workpiece by visual inspection or sight glass, wherein the coating is required to be flat in surface, uniform in color, free of bubbles, cracks and shrinkage cavities and allowed to have slight orange-peel patterns; b) and (3) thickness detection: 1) measuring the thickness of the coating by using a coating thickness gauge, wherein the number of detection points in each square meter is not less than 25, the number of detection points of the small workpiece is not less than 5, finding out the maximum value, the minimum value and calculating the average value; 2) for the machined surface, the thickness is smaller than the required value and needs to be sprayed again or supplemented, and for the non-machined surface, the thickness is smaller than the required value and the number of detection points is more than 30 percent and needs to be sprayed again or supplemented; c) leak (pinhole) detection: and (3) detecting a leak point by using an electric spark pinhole detector, wherein the detection voltage is required to exceed 4V/mum, the surface temperature of the coating is not higher than 100 ℃ during detection, and when the leak point is found, repairing or re-spraying is carried out according to the regulation.
And 7, packaging the qualified products, delivering from the factory, establishing documents, and performing the next procedure on the unqualified products from the step 1 until the unqualified products are qualified.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. The coating process of the wear-resistant corrosion-resistant coating is characterized by comprising the following steps of:
step (1), finishing the surface of a workpiece;
step (2), performing sand blasting on the workpiece to remove dirt;
step (3), preheating the workpiece;
step (4), coating the workpiece paint;
and (5) curing the workpiece coating to finish coating the workpiece.
2. The coating process of claim 1, wherein in the step (1), when the workpiece is a welded part, the surface of the welded seam is polished flat and smooth; when the workpiece is an iron casting, the surface of the workpiece is smooth and flat without air holes, shrinkage cavities, bonded sand and burrs.
3. The coating process of claim 1, wherein in step (2), the surface of the workpiece is subjected to water removal, oil removal, dirt removal, spot removal, rust removal and scale removal.
4. The coating process of claim 3, wherein the baking temperature in the furnace for water and oil removal treatment is 270 ℃, the heating rate is not lower than 8 ℃/S, and the heat preservation time is 60 minutes or more; when the workpiece is a welding piece, a steel pipe or a steel piece, the baking temperature of the workpiece in the furnace for dewatering and deoiling is 250 ℃, and the heat preservation time is 40 to 60 minutes.
5. The coating process of claim 4, wherein 10-20 mesh quartz sand or gold steel sand is used as a sand blasting material, and is used alone or in combination, and the used quartz sand or gold steel sand is dried, cleaned and free of dust and impurities; and (3) carrying out sand blasting treatment on the workpiece by using a sand blasting material, wherein the surface roughness of the treated workpiece reaches Sa2.5 grade, the natural color of the exposed metal is uniform, and the surface anchorage degree is 20-80 mu m.
6. The coating process of the wear-resistant and corrosion-resistant coating according to claim 1, wherein in the step (3), the preheating temperature is strictly controlled within a range of 240-270 ℃, the preheating temperature is controlled at an upper limit for pump, machine and valve workpieces serving in a heavy corrosion medium, and the preheating temperature is controlled at a lower limit for internal and external corrosion prevention of pipeline workpieces.
7. The coating process of the wear-resistant and corrosion-resistant coating according to claim 1, wherein in the step (4), a spray gun is used for coating the workpiece, the air pressure of the spray gun is controlled to be more than 0.5Mpa, the high pressure of the spray gun is adjusted to be 50-80 KV, the current is correspondingly 300 μm, the distance between the spray gun and the workpiece is controlled to be 80-150 mm, the coating is uniformly carried out, and the thickness of the coating is ensured to be 1-2 mm; the sprayed coating is a fusion bonded epoxy thermosetting powder coating.
8. The coating process of the wear-resistant and corrosion-resistant coating material according to claim 1, wherein in the step (5), the curing temperature of the coating material is controlled to be 180-240 ℃, and the curing time is controlled to be 30-60 min.
9. The coating process of claim 1, further comprising the steps of (6), quality inspection; the quality detection of the workpiece is as follows:
a) the appearance requirement is as follows: visual inspection or visual inspection is used, and the coating is required to be flat in surface, uniform in color, free of bubbles, cracks and shrinkage cavities and allowed to have slight orange-peel patterns;
b) the thickness requirement is as follows:
1) measuring by using a coating thickness gauge, wherein the number of detection points in each square meter is not less than 25, finding out the maximum value and the minimum value of the coating thickness of all monitoring points, and calculating an average value;
2) for the machined surface, the thickness is less than the set value and needs to be sprayed again or supplemented, and for the non-machined surface, the number of detection points with the thickness less than the set value is more than 30 percent and needs to be sprayed again or supplemented;
c) leak (pinhole) detection: and (3) detecting the leakage points by using an electric spark pinhole detector, wherein the detection voltage needs to exceed 4V/mum, the surface temperature of the coating is not higher than 100 ℃ during detection, and when the leakage points are found, repairing or re-spraying is carried out.
10. The coating process of claim 9, further comprising a step (7) of packaging qualified workpieces after quality inspection and creating documents.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011143774.1A CN112246580A (en) | 2020-10-23 | 2020-10-23 | Coating process of wear-resistant and corrosion-resistant paint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011143774.1A CN112246580A (en) | 2020-10-23 | 2020-10-23 | Coating process of wear-resistant and corrosion-resistant paint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112246580A true CN112246580A (en) | 2021-01-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011143774.1A Pending CN112246580A (en) | 2020-10-23 | 2020-10-23 | Coating process of wear-resistant and corrosion-resistant paint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112246580A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114146885A (en) * | 2021-12-27 | 2022-03-08 | 北京华德星科技有限责任公司 | Spraying method of corrosion-resistant coating for top of crude oil distillation tower |
| CN116197091A (en) * | 2023-01-09 | 2023-06-02 | 河北中和铸造有限公司 | Valve spraying process |
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| 中华人民共和国国家质量监督检验检疫总局等: "熔融结合环氧粉末涂料的防腐蚀涂装", 《CNKI国家标准全文数据库》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114146885A (en) * | 2021-12-27 | 2022-03-08 | 北京华德星科技有限责任公司 | Spraying method of corrosion-resistant coating for top of crude oil distillation tower |
| CN116197091A (en) * | 2023-01-09 | 2023-06-02 | 河北中和铸造有限公司 | Valve spraying process |
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Application publication date: 20210122 |