CN112474243A - Powder spraying process for aluminum plate product - Google Patents
Powder spraying process for aluminum plate product Download PDFInfo
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- CN112474243A CN112474243A CN202011398839.7A CN202011398839A CN112474243A CN 112474243 A CN112474243 A CN 112474243A CN 202011398839 A CN202011398839 A CN 202011398839A CN 112474243 A CN112474243 A CN 112474243A
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- Prior art keywords
- aluminum plate
- powder
- baking
- spraying
- paint
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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
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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
- 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
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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
- 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
- B05D3/10—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 other chemical means
- B05D3/102—Pretreatment of metallic substrates
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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
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/542—No clear coat specified the two layers being cured or baked together
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- 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
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
-
- 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
- B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
- B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
- B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to a powder spraying process of an aluminum plate product, which comprises the following steps: s1, cleaning, namely, firstly, degreasing the aluminum plate by using acid liquor, then washing the aluminum plate by using clear water, finally soaking the aluminum plate in aluminum passivation solution for passivation, and finally drying the aluminum plate; s2, hanging the dried aluminum plates on a track beam, and polishing the aluminum plates to remove fine scratches and form a plurality of annular-like microgrooves; s3, spraying paint powder by using an electrostatic spray gun, spraying the surface of the aluminum plate to form the paint powder, and spraying the edge end surface to form primer powder; s4, baking, namely, putting the aluminum plate sprayed with the paint powder in the step S3 into a baking chamber for high-temperature baking to enable the paint powder to be melted and to be self-leveled; and S5, discharging, taking the baked aluminum plate down from the track beam after the baked aluminum plate is completely cooled, and packaging and warehousing. The invention achieves the following beneficial effects: the inner layer particles are not easy to move, the outer layer particles automatically move to the blank, the spraying uniformity effect is improved, and the cost quality is improved.
Description
Technical Field
The invention relates to the technical field of aluminum plate nozzles, in particular to a powder spraying process of an aluminum plate product.
Background
After the aluminum plate is finished, the surface is sprayed, typically with paint, and then baked. This method generally applies liquid paint, and therefore the resulting paint layer is related to the thickness of the paint layer that is formed when the spray gun applies the paint. But in general, the spray gun sprays the paint from the center to the periphery; if the middle thick edge is thin when one point is sprayed; if the spray gun sprays the paint on the whole board surface in a moving way, although every part is sprayed, the paint is still sprayed in a point spraying way, and the formed paint is still very uneven; but are not readily discernable by the naked eye and are considered homogeneous.
Therefore, the paint powder is sprayed by using an electrostatic gun, namely, the paint powder is repelled and atomized more finely under the action of a direct-current high-voltage electric field by using the principle that like charges repel and unlike charges are different, and the paint powder is attached to an aluminum plate with different characteristics. But this approach works well for small pieces; the effect is not particularly desirable for large plate aluminum panels.
The company improves the powder spraying process on the basis of spraying paint powder by using an electrostatic gun, achieves a good uniform spraying effect, and is particularly suitable for large aluminum plates.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a powder spraying process for an aluminum plate product, which has the advantages that inner-layer particles are not easy to move, outer-layer particles automatically move to a blank position, the spraying uniformity effect is improved, and the cost and the quality are improved.
The purpose of the invention is realized by the following technical scheme: a powder spraying process for an aluminum plate product comprises the following steps:
s1, cleaning, namely, firstly, degreasing the aluminum plate by using acid liquor, then washing the aluminum plate by using clear water, finally soaking the aluminum plate in aluminum passivation solution for passivation, and finally drying the aluminum plate;
s2, hanging the dried aluminum plates on a track beam, and polishing the aluminum plates to remove fine scratches and form a plurality of annular-like microgrooves;
s3, spraying paint powder by using an electrostatic spray gun, spraying the surface of the aluminum plate to form the paint powder, and spraying the edge end surface to form primer powder;
s4, baking, namely, putting the aluminum plate sprayed with the paint powder in the step S3 into a baking chamber for high-temperature baking to enable the paint powder to be melted and to be self-leveled;
and S5, discharging, taking the baked aluminum plate down from the track beam after the baked aluminum plate is completely cooled, and packaging and warehousing.
Further, in step S3, when spraying, the paint powder layer in contact with the aluminum plate is an inner layer, the paint powder layer that reaches later is an outer layer, the inner layer has a certain repulsion to the outer layer, the micro-grooves in the ring-like shape play a role in surrounding and blocking the paint powder of the inner layer, so that all paint particles of the paint powder are prevented from moving under the action of the repulsion, and the adhesion uniformity is improved. Because the charged coating particles can not immediately discharge all charges when contacting the aluminum plate, the first-arriving particles have the same charge repulsion force to the later-arriving particles, so that the later-arriving particles act, and if the small pieces are, the later-arriving particles can wind around the back of the workpiece to generate certain package; however, the aluminum plate is a large piece, coating cannot be generated, and due to the fact that the action of force is mutual, particles which arrive first can move, so that the spraying effect is not good enough, and in order to avoid the situation that the positions of the particles which arrive first keep unchanged basically, the aluminum plate is polished to form a similar annular micro-groove, and the effect of enclosure is achieved; meanwhile, the particles reached after the spraying are moved to the position where the spraying is not carried out, and the uniformity of the surface spraying of the aluminum plate is ensured.
Further, in step S3, the baking areas of the baking chamber are arranged at intervals, that is, the baking area-normal temperature area-baking area-normal temperature area; the paint powder on the aluminum plate is firstly melted at a high temperature, then preliminarily condensed at normal temperature, then melted at a high temperature and further condensed. The situation that the upper part is thin and the lower part is thick is avoided after the paint powder is baked once and melted and under the action of gravity.
Preferably, in the step S3, the aluminum plate is sprayed while being driven by the track beam to move at a speed of 2-3 m/min.
Preferably, in the step S4, the temperature of the baking region of the baking chamber is 80 to 120 ℃, and the temperature of the normal temperature region is 60 to 80 ℃.
Preferably, the time for baking the aluminum plate in the baking chamber is 10-20 min.
Further, in step S1, oil stain treatment is performed with hydrofluoric acid, and the oil stain treatment time is less than 1 min.
Further, in the step S2, passivation is performed for a plurality of times, drying is performed after the first passivation, and micro pits are formed on the passivation surface by divergent high pressure gas injection after the second passivation. Facilitating the subsequent adsorption of the paint powder.
The invention has the following advantages: during passivation, when divergent high-pressure gas is sprayed, micro pits are formed on a passivation surface, micro grooves similar to ring shapes are formed during polishing, paint powder particles arriving firstly are tightly attached to the micro pits, and the micro grooves have the function of a surrounding ring, so that the paint powder particles arriving firstly on an aluminum plate can not move under the particles arriving later, and an inner layer with good adsorption is formed; and the inner layer generates repulsion force to the outer layer particles which are reached later, so that the outer layer particles which are reached later move to other blank areas under the action of the repulsion force, and the uniformity of spraying is ensured.
Detailed Description
The present invention is further described below in conjunction with the following description, but the scope of the present invention is not limited to the following description.
Example 1
A powder spraying process for an aluminum plate product comprises the steps of:
s1, cleaning, namely, degreasing an aluminum plate by hydrofluoric acid solution, washing the aluminum plate by clear water, finally soaking the aluminum plate in aluminum passivation solution for passivation, wherein during passivation, passivation is performed for multiple times, drying is performed after first passivation, divergent high-pressure gas is sprayed after second passivation to form micro pits on the passivation surface, and finally drying is performed;
s2, hanging the dried aluminum plates on a track beam, and polishing the aluminum plates to remove fine scratches and form a plurality of annular-like microgrooves;
s3, spraying paint powder in a spraying chamber by using an electrostatic spray gun, spraying the surface of the aluminum plate to form the paint powder, and spraying the edge end surface to form primer powder; when in spraying, the paint powder layer which is firstly contacted with the aluminum plate is an inner layer, the paint powder which is then reached is an outer layer, the inner layer has a certain repulsion effect on the outer layer, the micro-grooves in the ring-like shape play a role of surrounding and blocking the paint powder of the inner layer, so that the coating particles of all the paint powder are prevented from moving under the action of the repulsion force, and the adhesion uniformity is improved; and the track beam is kept to act during spraying;
s4, baking, namely, putting the aluminum plate sprayed with the paint powder in the step S3 into a baking chamber for high-temperature baking to enable the paint powder to be melted and to be self-leveled; the baking areas of the baking chamber are arranged at intervals, namely a baking area-normal temperature area-baking area-normal temperature area; firstly melting the paint powder on the aluminum plate at a high temperature, then primarily self-leveling, then primarily condensing at normal temperature, then melting at a high temperature, self-leveling again, and further condensing;
and S5, discharging, taking the baked aluminum plate down from the track beam after the baked aluminum plate is completely cooled, and packaging and warehousing.
Example 2
A powder spray process for an aluminum plate product, the procedure of which was the same as in example 1. Further: the time for cleaning with hydrofluoric acid in step S1 is less than 1 min; the moving speed of the aluminum plate in the step S3 is 2 m/min; in step S4, the baking zone temperature is 80 ℃, the normal temperature zone is 60 ℃, and the whole baking duration is 10 min.
Example 3
A powder spray process for an aluminum plate product, the procedure of which was the same as in example 1. Further: the time for cleaning with hydrofluoric acid in step S1 is less than 1 min; the moving speed of the aluminum plate in the step S3 is 3 m/min; in step S4, the baking temperature is 120 deg.C, the normal temperature zone is 80 deg.C, and the baking time is 20 min.
Due to the traditional electrostatic powder spraying method, for a small aluminum plate, a part of paint powder particles with charges can reach the surface of the aluminum plate firstly and are attached to the aluminum plate, but the part of particles can not be released immediately and can have certain repulsion action on the particles with charges which arrive later, so that the particles which arrive later can move along the surface of the aluminum plate, certain coating is carried out on the end face of an edge, and a part of particles can wind around the back of the small aluminum plate. In essence, however, the forces are reciprocal and when a later arriving outer particle exerts a force on an earlier arriving inner particle, the earlier arriving inner particle also moves. The effect produced is in fact exactly the opposite of the effect of spraying the liquid paint: when a certain point is sprayed, the later-reached outer layer particles are diffused from the point along the circumferential direction under the action of the earlier-reached inner layer particles; the inner layer particles can also be diffused along the circumferential direction under the action of the continuous outer layer particles; finally, the spraying layer with thin middle and rear circumference is formed.
For small aluminum plates, even if the inner layer powder particles in one area flow, the inner layer powder particles in other areas can be interfered with quickly, so that the inner layer particles in other areas are pressed to flow, and the overall thickness is not particularly uniform, but the overall effect is still better.
However, for the aluminum plate with a large plate, because the area is large, when a certain area is sprayed, other large-area inner layer particles are difficult to flow due to the existence of friction force; only the inner layer particles at the spray site will flow. The resulting sprayed layer is not uniform enough.
In the scheme, firstly, micro pits are formed on a passivation surface during passivation and divergent high-pressure gas is sprayed on the passivation surface, micro grooves similar to ring shapes are formed during polishing, paint powder particles arriving firstly are tightly attached to the micro pits, and the micro grooves have the function of a surrounding ring, so that the paint powder particles prevented by the aluminum plate arriving firstly cannot move under the particles arriving later, and an inner layer with good adsorption is formed; and the inner layer generates repulsion force to the outer layer particles which are reached later, so that the outer layer particles which are reached later move to other blank areas under the action of the repulsion force, and the uniformity of spraying is ensured.
The above examples only represent preferred embodiments, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (8)
1. A powder spraying process of an aluminum plate product is characterized in that: the method comprises the following steps:
s1, cleaning, namely, firstly, degreasing the aluminum plate by using acid liquor, then washing the aluminum plate by using clear water, finally soaking the aluminum plate in aluminum passivation solution for passivation, and finally drying the aluminum plate;
s2, hanging the dried aluminum plates on a track beam, and polishing the aluminum plates to remove fine scratches and form a plurality of annular-like microgrooves;
s3, spraying paint powder by using an electrostatic spray gun, spraying the surface of the aluminum plate to form the paint powder, and spraying the edge end surface to form primer powder;
s4, baking, namely, putting the aluminum plate sprayed with the paint powder in the step S3 into a baking chamber for high-temperature baking to enable the paint powder to be melted and to be self-leveled;
and S5, discharging, taking the baked aluminum plate down from the track beam after the baked aluminum plate is completely cooled, and packaging and warehousing.
2. A process of powder coating an aluminium sheet product according to claim 1, wherein: in step S3, during spraying, the paint powder layer in contact with the aluminum plate is an inner layer, the paint powder layer that reaches later is an outer layer, the inner layer has a certain repulsion effect on the outer layer, the ring-like micro-grooves play a role in surrounding and blocking the paint powder layer of the inner layer, so that all paint particles of the paint powder are prevented from moving under the action of the repulsion force, and the adhesion uniformity is improved.
3. A process of powder coating an aluminium sheet product according to claim 2, wherein: in the step S3, the baking areas of the baking chamber are arranged at intervals, that is, the baking area-normal temperature area-baking area-normal temperature area; the paint powder on the aluminum plate is firstly melted at a high temperature, then preliminarily condensed at normal temperature, then melted at a high temperature and further condensed.
4. A process of powder coating an aluminium sheet product according to claim 3, wherein: in the step S3, the aluminum plate is sprayed while being driven by the track beam to move at a speed of 2-3 m/min.
5. A powder coating process for an aluminium sheet product according to claim 4, wherein: in the step S4, the temperature of the baking area of the baking chamber is 80 to 120 ℃, and the temperature of the normal temperature area is 60 to 80 ℃.
6. A process of powder coating an aluminium sheet product according to claim 5, wherein: the time for baking the aluminum plate in the baking chamber is 10-20 min.
7. The powder coating process for an aluminum plate product according to any one of claims 1 to 6, wherein: in the step S1, hydrofluoric acid is used for oil stain treatment, and the oil stain treatment time is less than 1 min.
8. A process of powder coating an aluminium sheet product according to claim 7, wherein: in the step S2, passivation is performed for a plurality of times, drying is performed after the first passivation, and micro pits are formed on the passivation surface by divergent high-pressure gas injection after the second passivation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011398839.7A CN112474243B (en) | 2020-12-03 | 2020-12-03 | Powder spraying process for aluminum plate product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011398839.7A CN112474243B (en) | 2020-12-03 | 2020-12-03 | Powder spraying process for aluminum plate product |
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| Publication Number | Publication Date |
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| CN112474243A true CN112474243A (en) | 2021-03-12 |
| CN112474243B CN112474243B (en) | 2021-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011398839.7A Active CN112474243B (en) | 2020-12-03 | 2020-12-03 | Powder spraying process for aluminum plate product |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115370093A (en) * | 2022-09-19 | 2022-11-22 | 墙煌新材料股份有限公司 | Spraying type 3D stone grain aluminum veneer and production system thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104826779A (en) * | 2015-05-29 | 2015-08-12 | 吉祥铝业（长兴）有限公司 | Sectional material spraying technology |
| CN108816707A (en) * | 2018-07-04 | 2018-11-16 | 安徽省浦菲尔建材有限公司 | A kind of processing technology of mould board |
-
2020
- 2020-12-03 CN CN202011398839.7A patent/CN112474243B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104826779A (en) * | 2015-05-29 | 2015-08-12 | 吉祥铝业（长兴）有限公司 | Sectional material spraying technology |
| CN108816707A (en) * | 2018-07-04 | 2018-11-16 | 安徽省浦菲尔建材有限公司 | A kind of processing technology of mould board |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115370093A (en) * | 2022-09-19 | 2022-11-22 | 墙煌新材料股份有限公司 | Spraying type 3D stone grain aluminum veneer and production system thereof |
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| Publication number | Publication date |
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| CN112474243B (en) | 2021-08-24 |
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