CN114632682A - Spray forming process for fluoropolymer coating on surface of metal part - Google Patents
Spray forming process for fluoropolymer coating on surface of metal part Download PDFInfo
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- CN114632682A CN114632682A CN202210238486.7A CN202210238486A CN114632682A CN 114632682 A CN114632682 A CN 114632682A CN 202210238486 A CN202210238486 A CN 202210238486A CN 114632682 A CN114632682 A CN 114632682A
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- 239000004446 fluoropolymer coating Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 33
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 30
- 239000002184 metal Substances 0.000 title claims abstract description 30
- 238000009718 spray deposition Methods 0.000 title claims description 25
- 238000005507 spraying Methods 0.000 claims abstract description 57
- 239000011248 coating agent Substances 0.000 claims abstract description 36
- 238000000576 coating method Methods 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000001035 drying Methods 0.000 claims abstract description 35
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 21
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 21
- 238000005488 sandblasting Methods 0.000 claims abstract description 20
- 238000006073 displacement reaction Methods 0.000 claims abstract description 14
- 239000007921 spray Substances 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical group ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 9
- 229910019142 PO4 Inorganic materials 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 8
- 239000010452 phosphate Substances 0.000 claims description 8
- 239000012459 cleaning agent Substances 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000010431 corundum Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000001723 curing Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 description 14
- 238000005260 corrosion Methods 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 238000010981 drying operation Methods 0.000 description 3
- 229920002313 fluoropolymer Polymers 0.000 description 3
- 239000004811 fluoropolymer Substances 0.000 description 3
- CLVOYFRAZKMSPF-UHFFFAOYSA-N n,n-dibutyl-4-chlorobenzenesulfonamide Chemical compound CCCCN(CCCC)S(=O)(=O)C1=CC=C(Cl)C=C1 CLVOYFRAZKMSPF-UHFFFAOYSA-N 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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
- 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
- B05D7/14—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 to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
-
- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
-
- 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
- B05D3/02—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
- 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
- B05D5/083—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 involving the use of fluoropolymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a spraying forming process of a fluoropolymer coating on the surface of a metal piece, which comprises the steps of surface cleaning, sand blasting, phosphating drying, spraying of the fluoropolymer coating, drying and curing, wherein during spraying operation of the fluoropolymer coating, the dew point temperature of a spraying space is 3-10 ℃, the surface temperature of a dried phosphating layer is +30 +/-5 ℃, and during drying and curing, a plurality of temperature control detection points of a PTFE spraying layer and temperature control irradiation or reflection sources aiming at the temperature control detection points are provided, the distance between the temperature control detection points is 3-5 cm, the temperature of the temperature control detection points is 225 +/-15 ℃, and the temperature difference between adjacent temperature control detection points is less than 10 ℃. The invention adopts the temperature control detection points to monitor the temperature before pre-drying, meets the heating uniformity of the coating, ensures the curing of the coating to be reliable and uniform, can meet the coating uniformity without operations such as polishing and the like, and is easy to realize subsequent assembly. The uniform spraying is realized by the combination of the linear displacement of the conical spray head and the rotation of the workpiece, and the uniformity of the sprayed layer is excellent.
Description
Technical Field
The invention relates to a spray forming process of a fluoropolymer coating on the surface of a metal piece, belonging to the technical field of corrosion-resistant spray forming.
Background
The functional coating has wide coverage range, and fasteners, hardware objects, petroleum and petrochemical equipment parts, screws, nuts, white lock nuts, wood screws, electronic accessories, marine components and the like need different types of surface treatment according to different purposes, so that the requirements of corrosion resistance, high temperature resistance, wear resistance and the like are met.
The conventional surface treatment process comprises: the problems of insufficient corrosion resistance and the like exist in phosphating treatment, electrogalvanizing, cadmium plating, zinc-plated magnesium alloy and aluminum ceramic, and in an ASTMB-117 corrosion resistance test, the application requirements of high-temperature, high-humidity and high-corrosion environments cannot be met because the zinc plating time is 120 hours, and the cadmium plating time and the hot dip galvanizing time are 400-600 hours.
Aiming at the situation, the PTFE fluoropolymer coating has the characteristics of ultra-thinness, extremely strong corrosion resistance, effective prolonging of the service life of products, non-sticking property and low friction property; resistance to corrosion by various chemicals; the anticorrosive coating has the characteristics of strong weather resistance and the like, is applied to fasteners such as bolts and the like on a large scale, provides better anticorrosive capacity for the fasteners, has rusted wall surface bolts, delays failure period, is easier to install and disassemble, has excellent performance in severe corrosion environment, is widely applied to the surface anticorrosive treatment of the fasteners of petrochemical industry, nuclear power, electric power, natural gas and marine oil platforms, underwater equipment and seawater desalination equipment, and is suitable for various fastener products with different grades of materials. The material includes: carbon steel, alloy steel, stainless steel and the like are applied to coating of high-strength carbon steel or alloy steel bolts, can replace stainless steel fasteners to be used in occasions where the strength of a plurality of stainless steel bolts is low and cannot meet the design requirements of equipment, and can improve the connection strength under the condition that the corrosion resistance is not lower than that of stainless steel.
The spraying operation of the traditional PTFE fluoropolymer coating comprises the following steps: firstly, cleaning and air-drying the metal surface by using a cleaning agent, then carrying out rough matching phosphating treatment on the metal surface by sand blasting to obtain a phosphating drying workpiece, and finally carrying out PTFE fluoropolymer spray forming, drying and polishing.
The thickness of its PTFE fluoropolymer spraying layer is generally controlled at 25 mu m ~35 mu m, and the adhesion stability and the coating solidification homogeneity of PTFE fluoropolymer spraying layer are difficult to be controlled, can cause the coating thickness to appear great fluctuation, especially to the spraying product that possesses the screw thread section, the screw thread section can't realize high accuracy and polish, it requires that the assembly precision is very high, when carrying out high accuracy shaping to this type of high accuracy cooperation work piece at present, generally adopt the mode of preassembly or reference assembly, it can carry out improvements such as little plastic to screw thread section surface coating to refer to the assembly, but increased spraying production cycle undoubtedly, the local homogeneity difference of spraying layer easily influences effective life simultaneously.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a spray forming process of a fluoropolymer coating on the surface of a metal part, aiming at the problems of poor curing uniformity, high pre-assembly cost, long period, difficult quality control and the like of the traditional spray coating.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the spray forming process of the fluoropolymer coating on the surface of the metal piece comprises the following steps:
s1, cleaning the surface of the metal piece, and cleaning the surface of the metal piece with a cleaning agent;
s2, performing sand blasting, namely performing sand blasting treatment on the surface of the cleaned metal piece to form a sand blasting rough layer;
s3, phosphating and drying, namely phosphating the sand blasting rough layer and drying to obtain a dried phosphating layer;
s4 spraying the fluoropolymer coating, and spraying and molding the PTFE fluoropolymer coating on the dried phosphate coating to form a PTFE spraying layer;
s5, drying and curing the PTFE spray coating to form a cured PTFE layer;
in the step S4, the dew point temperature of the spraying space is 3-10 ℃, the surface temperature of the drying and phosphating layer is the dew point temperature plus 30 +/-5 ℃,
in the step S5, a plurality of temperature control detection points for the PTFE spray coating and a plurality of temperature control irradiation or reflection sources for the temperature control detection points are provided, the distance between the temperature control detection points is 3cm to 5cm, the temperature of the temperature control detection points is 225 ℃ ± 15 ℃, and the temperature difference between adjacent temperature control detection points is less than 10 ℃.
Preferably, the metal piece is a shaft-type locking piece with a threaded section.
Preferably, in step S4, the conical spray nozzle is used to uniformly spray the surface of the shaft-like fastener.
Preferably, in step S4, the spray coating device includes an axial rotation spray coating jig that clamps the shaft-like fastener and performs axial rotation spray coating, and the conical spray coating nozzle has axial linear displacement and is radially opposed to the shaft-like fastener.
Preferably, in step S5, a rotary drying jig is used to axially rotate and dry the shaft-like locking pieces.
Preferably, in step S5, the shaft-type locking piece includes a plurality of temperature control detection points that are uniformly distributed at intervals along the axial direction of the shaft-type locking piece, and the temperature control detection points include detection displacement and avoidance drying displacement.
Preferably, in step S1, the cleaning agent is dichloromethane.
Preferably, in the step S2, 80-120 mesh brown corundum is used for sand blasting, and the sand blasting pressure is 4-6 bar.
The invention has the following beneficial effects:
1. the temperature control detection points are adopted for temperature monitoring before pre-drying, the heating uniformity of the coating is met, the coating is ensured to be cured reliably and uniformly, the coating uniformity can be met without operations such as polishing, and subsequent assembly is easy to realize.
2. The uniform spraying is realized by combining the linear displacement of the conical spray head with the rotation of the workpiece, the uniformity of a sprayed layer is excellent, and the curing uniformity can be ensured by combining the sprayed layer with the multipoint temperature control at the rear end.
3. The spray forming process is simplified, the traditional coating fine adjustment operations such as polishing, preassembly and the like are omitted, the spray qualified rate of products is greatly improved, and the spray forming process has high economic value.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic flow chart of a fluoropolymer coating spray-forming process on the surface of a metal part according to the present invention.
Fig. 2 is a schematic structural view of the axial rotation spraying jig and the conical spraying nozzle of the present invention.
Fig. 3 is a schematic structural view of the rotary drying jig and the temperature control detection point of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The invention provides a spray forming process of a fluoropolymer coating on the surface of a metal piece, which comprises the following steps as shown in figure 1:
and S1, cleaning the surface of the metal piece by using a cleaning agent which is dichloromethane.
S2, performing sand blasting, namely performing sand blasting treatment on the surface of the cleaned metal piece to form a sand blasting rough layer, wherein the sand blasting adopts 80-120 meshes of brown corundum, and the sand blasting pressure is 4-6 bar.
And S3, phosphating and drying the sand blasting rough layer, and drying to obtain a dried phosphating layer. The phosphating process is carried out according to the WX2016022201 standard and requires that the treated parts have uniform and consistent appearances.
S4 spraying the fluoropolymer coating, and spraying and molding the PTFE fluoropolymer coating on the dried phosphate coating to form a PTFE sprayed layer.
And S5, drying, and drying and curing the PTFE spray coating to form a cured PTFE layer.
In the scheme, when the fluoropolymer coating is sprayed, the dew point temperature of a spraying space is 3-10 ℃, and the surface temperature of the dried phosphate coating is the dew point temperature plus 30 +/-5 ℃.
Namely, the monitoring mode of the dew point temperature and the temperature of the surface of the metal piece are correlated and monitored, so that the fluoropolymer coating is uniformly sprayed, and the fluoropolymer coating is the Xylan1425 coating of the United states of China.
When the drying operation is carried out, a plurality of temperature control detection points aiming at the PTFE spraying layer and a temperature control irradiation or reflection source aiming at the temperature control detection points are provided, the distance between the temperature control detection points is 3 cm-5 cm, the temperature of the temperature control detection points is 225 +/-15 ℃, and the temperature difference between the adjacent temperature control detection points is less than 10 ℃.
The spray forming process is mainly used for shaft locking pieces with threaded sections.
In one embodiment, as shown in fig. 2, a conical spray nozzle 1 is used to uniformly spray the surface of the shaft fasteners. The axial rotation spraying jig 2 is provided for clamping the shaft locking piece to perform axial rotation spraying, the conical spraying nozzle 1 is provided with axial linear displacement, and the conical spraying nozzle is radially opposite to the shaft locking piece.
Specifically, the requirement on the surface spraying uniformity of the shaft locking piece can be met by combining the linear displacement of the conical spraying nozzle 1 with the rotational displacement of the shaft locking piece.
Generally, the rotating speed of the axial rotating spraying jig 2 is 5-10 revolutions per second, the linear speed of the conical spraying nozzle 1 is 1cm per second, the spraying distance of the conical spraying nozzle 1 is 3-5 cm, and the rotating leveling time is kept for 5 seconds after the spraying is finished.
In one embodiment, as shown in fig. 3, the shaft-type fastener is axially spin-dried by using a spin-drying jig 3. Possess a plurality of along axle type locking part axial looks interval evenly distributed's control by temperature change check point 4, control by temperature change check point 4 possesses the detection displacement and dodges stoving displacement.
During spraying and drying operation, temperature monitoring of the temperature control detection points 4 is carried out by adopting temperature sensing elements such as thermocouples and the like, temperature adjustment of the temperature control detection points 4 is carried out by adjusting a temperature control source, the temperature sensing elements are removed after the temperature adjustment of the temperature control detection points 4 is finished, then the rotary drying jig 3 is moved in place, and the rotary drying operation is carried out, wherein the general drying time is 120-300 min.
Example one
When the fluoropolymer coating is sprayed, the dew point temperature of a spraying space is 3 ℃, and the surface temperature of the drying phosphate coating is 35 ℃. The fluoropolymer coating was Xylan1425 coating from warf, usa.
The method comprises the steps of axially arranging 6 temperature monitoring points, wherein the temperature of the temperature monitoring points on two sides is 225 ℃, the temperature of the temperature monitoring points on the other four sides is 217 ℃, 229 ℃, 223 ℃ and 231 ℃, and the drying time is 120min to obtain a first sample.
Example two
When the fluoropolymer coating is sprayed, the dew point temperature of a spraying space is 8 ℃, and the surface temperature of the drying phosphate coating is 40 ℃. The fluoropolymer coating is Xylan1425 coating from washingt, usa.
And (3) 6 temperature monitoring points along the axial direction are provided, the temperature of the temperature monitoring points on two sides is 235 ℃, the temperature of the temperature monitoring points on the other four sides is 231 ℃, 236 ℃, 228 ℃ and 236 ℃, and the drying time is 120min, so that a second sample is prepared.
EXAMPLE III
When the fluoropolymer coating is sprayed, the dew point temperature of a spraying space is 10 ℃, and the surface temperature of the drying phosphate coating is 40 ℃. The fluoropolymer coating was Xylan1425 coating from warf, usa.
And the temperature of the temperature monitoring points on two sides is 240 ℃, the temperature of the temperature monitoring points on the other four sides is 235 ℃, 238 ℃, 228 ℃ and 239 ℃, and the drying time is 180min, thus obtaining a third sample.
Example four
When the fluoropolymer coating is sprayed, the dew point temperature of a spraying space is 10 ℃, and the surface temperature of the drying phosphate coating is 45 ℃. The fluoropolymer coating was Xylan1425 coating from warf, usa.
The method comprises the steps of axially arranging 6 temperature monitoring points, wherein the temperatures of the temperature monitoring points on two sides are 215 ℃, the temperatures of the other four monitoring points are 215 ℃, 218 ℃, 223 ℃ and 211 ℃, and the drying time is 240min, so as to obtain a sample IV.
| Test item | Maximum coating thickness | Minimum coating thickness | Adhesion force | Hardness of coating | ASTM B-117 test (rust time) | 4000 hour ASTM B-117 test |
| Sample No | 26.1μm | 25.9μm | 5B | 5H | ＞2100h | The surface red rust is less than 10 percent |
| Sample No. 2 | 27.3μm | 26.6μm | 5B | 5H | ＞2100h | The surface red rust is less than 10 percent |
| Sample No. three | 26.5μm | 25.7μm | 5B | 5H | ＞2100h | The surface red rust is less than 10 percent |
| Sample No. 4 | 26.7μm | 25.8μm | 5B | 5H | ＞2100h | The surface red rust is less than 10 percent |
。
Therefore, four groups of samples prepared by the spray forming process meet corrosion resistance tests, meanwhile, the adhesive force and the coating hardness meet detection requirements, in addition, the maximum thickness and the minimum thickness of a cured coating are not more than 1 mu m, the coating is uniform integrally, and the requirements on assembly precision can be met without secondary grinding and pre-assembly combination.
Through the above description, it can be found that the fluoropolymer coating spray-forming process on the surface of the metal part, provided by the invention, adopts the temperature control detection points to monitor the temperature before pre-drying, so that the heating uniformity of the coating is met, the coating is ensured to be cured reliably and uniformly, the coating uniformity can be met without operations such as polishing, and the subsequent assembly is easy to realize. The uniform spraying is realized by combining the linear displacement of the conical spray head with the rotation of the workpiece, the uniformity of a sprayed layer is excellent, and the curing uniformity can be ensured by combining the sprayed layer with the multipoint temperature control at the rear end. The spray forming process is simplified, the traditional coating fine adjustment operations such as polishing, preassembly and the like are omitted, the spray qualified rate of products is greatly improved, and the spray forming process has high economic value.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (8)
1. The spray forming process of the fluoropolymer coating on the surface of the metal piece comprises the following steps:
s1, cleaning the surface of the metal piece, and cleaning the surface of the metal piece with a cleaning agent;
s2, performing sand blasting, namely performing sand blasting treatment on the surface of the cleaned metal piece to form a sand blasting rough layer;
s3, phosphating and drying, namely phosphating the sand blasting rough layer and drying to obtain a dried phosphating layer;
s4 spraying the fluoropolymer coating, and spraying and molding the PTFE fluoropolymer coating on the dried phosphate coating to form a PTFE spraying layer;
s5, drying and curing the PTFE spray coating to form a cured PTFE layer;
the method is characterized in that:
in the step S4, the dew point temperature of the spraying space is 3-10 ℃, the surface temperature of the drying and phosphating layer is the dew point temperature plus 30 +/-5 ℃,
in the step S5, a plurality of temperature control detection points for the PTFE spray coating and a plurality of temperature control irradiation or reflection sources for the temperature control detection points are provided, the distance between the temperature control detection points is 3cm to 5cm, the temperature of the temperature control detection points is 225 ℃ ± 15 ℃, and the temperature difference between adjacent temperature control detection points is less than 10 ℃.
2. The spray forming process of fluoropolymer coating on the surface of metal piece according to claim 1, wherein:
the metal piece is a shaft locking piece with a threaded section.
3. The spray forming process of fluoropolymer coating on the surface of metal piece according to claim 2, wherein:
in the step S4, the conical spray nozzle is used to uniformly spray the surface of the shaft-like locking piece.
4. The spray forming process of fluoropolymer coating on the surface of metal piece according to claim 3, wherein:
in step S4, the axial rotation spraying apparatus is provided to clamp the shaft-like locking member and perform axial rotation spraying, and the conical spraying nozzle has axial linear displacement and is radially opposite to the shaft-like locking member.
5. The spray forming process of fluoropolymer coating on the surface of metal piece according to claim 2, wherein:
in the step S5, a rotary drying jig is used to axially rotate and dry the shaft-like locking pieces.
6. The spray forming process of fluoropolymer coating on the surface of metal piece according to claim 5, wherein:
in the step S5, the temperature control detection points are provided and are uniformly distributed at intervals along the axial direction of the shaft-like locking member, and the temperature control detection points include detection displacement and avoidance drying displacement.
7. The spray forming process of fluoropolymer coating on the surface of metal piece according to claim 1, wherein:
in step S1, the cleaning agent is dichloromethane.
8. The spray forming process of the fluoropolymer coating on the surface of the metal piece according to claim 1, wherein the spray forming process comprises the following steps:
in the step S2, 80-120 meshes of brown corundum is adopted for sand blasting, and the sand blasting pressure is 4-6 bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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