CN105665259A - Surface plastic powder spraying method for realizing corrosion prevention and weather resistance of aluminum plate and aluminum plate - Google Patents
Surface plastic powder spraying method for realizing corrosion prevention and weather resistance of aluminum plate and aluminum plate Download PDFInfo
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- CN105665259A CN105665259A CN201610025252.9A CN201610025252A CN105665259A CN 105665259 A CN105665259 A CN 105665259A CN 201610025252 A CN201610025252 A CN 201610025252A CN 105665259 A CN105665259 A CN 105665259A
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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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate 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
- B05D3/002—Pretreatement
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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
- B05D7/53—Base coat plus clear coat type
- B05D7/534—Base coat plus clear coat type the first layer being let to dry at least partially before applying the second layer
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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
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
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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
- B05D2350/00—Pretreatment of the substrate
- B05D2350/10—Phosphatation
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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
- B05D2350/00—Pretreatment of the substrate
- B05D2350/30—Change of the surface
- B05D2350/33—Roughening
- B05D2350/38—Roughening by mechanical means
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
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- General Chemical & Material Sciences (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a surface plastic powder spraying method for realizing corrosion prevention and weather resistance of an aluminum plate and the aluminum plate. Before a plastic powder spraying process, the following processing processes are carried out on the aluminum plate: 1) aluminum plate wire drawing; 2) aluminum plate welding surface grinding; 3) hot water washing; 4) degreasing treatment; 5) at least twice water washing; 6) surface conditioning treatment; 7) phosphating treatment; 8) at least once water washing; 9) pure water washing; 10) drying; 11) pretreatment detection; and 12) surface dust removal treatment. According to the surface plastic powder spraying method, toxic chromizing treatment is abandoned, high adhesion of an aluminum plate coating is realized, the service life of resisting corrosion, bubbling, cavity shrinking and dropping of the coating can be effectively prolonged, and especially, the service life under a high-salt-mist and strong-light outdoor environment of the coating is prolonged. The invention further discloses the aluminum plate which realizes corrosion prevention and weather resistance by adopting the surface plastic powder spraying method.
Description
Technical field
The present invention relates to a kind of surface plastic spraying method and the sheet material adopting described surface plastic spraying method to process, particularly relate to and a kind of realize the weather-proof surface plastic spraying method of aluminium plate anticorrosion and the aluminium plate adopting described surface plastic spraying method to process.
Background technology
Current outdoor inverter cabinet is more and more adopts aluminium sheet to substitute steel plate processing, to reach the purpose of weight amount, high protection. Although aluminium sheet has better antiseptic property, but aluminium sheet is very easily oxidized, causing that the coating performance relatively steel plate of aluminium sheet is poor, Coating Pretreatment is improper to be easily caused coating and falls off at short notice or some corners of the defect, particularly cabinet such as bubbling and solder side position. And the better Coating Pretreatment of aluminium sheet standard needs to adopt the chromate treating process with pollution, first etch away surface of aluminum plate oxide skin, and a kind of chromaking epithelium can be formed in surface of aluminum plate, then carry out application at chromaking epithelial surfaces, so can ensure coating adhesion and antiseptic property. But the Cr VI that chromate treating uses exists problem of environmental pollution, and coating process cannot meet ROHS standard, chromated aluminum cabinet cannot use in most occasions; And chromate treating is by the restriction of environmental requirement, aluminum cabinet Coating Pretreatment can only adopt cleaning of simply polishing, then directly application, this weather-proof poor effect of application coating antiseptic under harsh outdoor environment, the coating process of aluminum cabinet cannot meet the salt air corrosion class requirement of C5-M.
In addition, outdoor inverter aluminum cabinet is in order to increase the class of outward appearance and attractive in appearance, the front panel of cabinet is more applies the light tone organic coatings (plastic-blasting or baking vanish) such as champagne gold, and the illumination that front panel is subject to is exposed to the sun, amount of radiation is bigger, faceplate coating is exposed to the sun the problem being very easy to fade, the weatherability such as loss of gloss, bubbling is poor for a long time, and the weather-proof life-span is difficult to ensure that. Compared to other color organic coatings (Dark grey and light gray) of case box, the light colored coating such as champagne is golden are mainly doped with the material such as Cu-Zn alloy powder and mica sheet in molding powder and coating, reach, with this, the metal bright normal complexion texture that champagne is golden. But the dopants such as Cu-Zn alloy powder especially easy generation oxidation deterioration when using out of doors, the gases such as steam in air, oxygen and sulfur dioxide directly and the Cu-Zn alloy powder generation chemical reaction of coating surface, and then can cause the fading of coating, loss of gloss and corrosion bubbling.Fade and the oxidation stain also extreme influence of aluminium panel light colored coating the protection life-span of inverter.
Summary of the invention
In order to solve above deficiency, the present invention proposes a kind of to realize the weather-proof surface plastic spraying method of aluminium plate anticorrosion and the aluminium plate adopting described surface plastic spraying method to process, (it is exactly chromaking that the standard of aluminum current sheet material processes to have abandoned poisonous chromate treating, break through tradition), achieve the high adhesion force of aluminium sheet application coating, can effectively promote the corrosion-resistant bubbling of coating, shrinkage cavity, life-span of coming off, the especially service life under high salt fog, intense light irradiation outdoor environment.
The solution of the present invention is: a kind of realize the surface plastic spraying method that aluminium plate anticorrosion is weather-proof, and aluminium plate included following processing technique successively before workmanship of spraying plastics: 1) aluminium plate wire drawing; 2) aluminium plate solder side polishing; 3) hot water wash; 4) ungrease treatment; 5) at least twice washing; 6) table mediates reason; 7) bonderizing; 8) at least one washing; 9) pure water is washed; 10) dry; 11) pre-treatment detection; 12) surface dust processes.
As the further improvement of such scheme, aluminium plate wire drawing processes: the two sides of aluminium plate is all carried out wharf's pavement quality, makes the surface roughness of aluminium plate be not less than Sa2.5.
As the further improvement of such scheme, aluminium plate solder side is polished: removes the oxide skin of aluminium plate welding position, flattens solder side simultaneously.
As the further improvement of such scheme, hot water wash: adopt infusion method that aluminium plate adopts the obstinate oil stain produced in hot-water soak softening panel beating process; Technological parameter: solvent, fresh water (FW); Temperature, 70 DEG C, soak time, 2～3min.
As the further improvement of such scheme, ungrease treatment: adopt infusion method to carry out ungrease treatment, technological parameter: degreasing agent content: percentage by volume vol% is 5%, temperature: 40～55 DEG C; Soak time: 5～10min; Dustiness :≤4g/L; Total alkalinity TB:6～20 point; Free alkalinity FB:4～10 point;
Carry out twice washing process, step 5 after defat respectively) washing process: adopt soak water clean, solvent: fresh water (FW); Temperature: 15～25 DEG C; Soak time: 3～5min; Gross contamination degree :≤0.5 point.
As the further improvement of such scheme, table mediates reason: adopts the adjustment of Henkel table to soak table and adjusts; The degreasing agent of PH:8～9.5: percentage by volume vol% is 0.03～0.04%; Temperature: 15～25 DEG C; Time: 2～3min.
As the further improvement of such scheme, bonderizing: adopt and soak phosphatization, solution: PH be 3～3.5 and mass percent wt% be the Zinc phosphating solution of 5%; Temperature: 35～45 DEG C; Time: 6～10min; Total acidity TA:17～25 point; The methyl orange of free acidity FA:0.8～1.2; Accelerator: the sodium nitrite of 2～4;
Carry out respectively after phosphatization one washing with together with pure water wash process, step 8) washing process: adopt soak water clean, solvent: fresh water (FW); Temperature: 15～25 DEG C; Soak time: 3～5min; Gross contamination degree :≤0.5 point;
Pure washing process: adopt spray pure water to clean, solvent: fresh water (FW), conductivity≤22 μ Ω cm, PH:6～9; Spray hydraulic pressure: 0.12～0.18MPa; Temperature: 15～25 DEG C; Soak time: 3～4min; Gross contamination degree :≤0.2 point.
As the further improvement of such scheme, drying and processing: put into oven for drying after washing and process, what fully dry in the structure gap between aluminium plate surface and adjacent aluminum plates material is water stain;Dry temperature: 80～110 DEG C; Time: 20～30min; Checking phosphorization film quality after drying, phosphating coat need to be uniform grey or Dark grey, inspection phosphating coat surface whether dust, there is dust and then carries out process of doing over again.
As the further improvement of such scheme, workmanship of spraying plastics includes: 13) plastic-blasting colour developing primary coat coating; 14) baking-curing; 15) plastic-blasting transparent area coating layer; 16) baking-curing;
Plastic-blasting colour developing primary coat coating: adopt dry compression air again to blow off aluminium plate surfaces externally and internally before plastic-blasting; The then colour developing primary coat coating of plastic-blasting 80～100 μ m-thick, plastic-blasting electrostatic 75KV; Primary coat coating enters baking oven and carries out preliminary baking-curing, adopts 180 DEG C of baking-curing 5～10min, it is achieved primary coat coated semi solid state;
Plastic-blasting transparent area coating layer: direct plastic-blasting transparent area coating layer after primary coat coating is in semi-cured state, coating layer thickness is 60～80 μm, plastic-blasting electrostatic 75KV; Enter baking oven after topcoating coating plastic-blasting and carry out baking-curing, adopt 180 DEG C of baking-curing 15～25min, it is achieved the abundant solidification of coating.
The present invention also provides for a kind of aluminium plate, and its surface adopts the above-mentioned weather-proof surface plastic spraying method of aluminium plate anticorrosion that arbitrarily realizes to process; The surface of aluminium plate sequentially forms phosphorization membrane, colour developing primary coat coating, transparent area coating layer.
Comparing the coating process of existing aluminum cabinet, the coating process of the present invention is more environmentally-friendly, and can greatly improve the adhesive force of aluminum cabinet coating, it is to avoid the defects such as coating shrinkage cavity, and the adhesive force of coating draws lattice can reach 0 grade; The performance can effectively promote the corrosion-resistant bubbling of coating, coming off, is resistant to more than neutral salt spray 1000h; Cabinet coating have better ageing-resistant fade, loss of gloss performance, be resistant to aging more than the 1000h of Ultraluminescence, this process can promote the anticorrosion weather-proof service life of cabinet coating. Outdoor inverter all can be provided reliable anticorrosion weather-proof protection by aluminum cabinet coating prepared by the present invention under coastal environments, Heavy Industrial environment. Additionally, this method is simple to operate, environmental protection, cost are low, it is widely used in finishing line and produces running.
Accompanying drawing explanation
Fig. 1 is the structural representation realizing the aluminium plate that the weather-proof surface plastic spraying method of aluminium plate anticorrosion processes adopting the embodiment of the present invention to provide.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, aluminium plate is processed into outdoor inverter aluminum cabinet, the anticorrosion that the surface plastic spraying method that cabinet aluminium sheet 1 adopts can realize cabinet aluminium sheet 1 is weather-proof, sequentially forms phosphorization membrane 2, colour developing primary coat coating 3, transparent area coating layer 4 on the surface of cabinet aluminium sheet 1. Colour developing primary coat coating 3, transparent area coating layer 4 adopt workmanship of spraying plastics, constitute the main body of sprayed plastic coat structure. Cabinet aluminium sheet 1 i.e. aluminium plate not only adopted phosphating process before workmanship of spraying plastics, and have employed in the phosphating process combination with workmanship of spraying plastics and process, with tradition early stage, the early stage processing mode that a state is unusual. Namely the present invention has abandoned the chromaking pre-treatment step that aluminium (such as aluminium plate) is poisonous, it is to avoid the excessive erosion of aluminium pre-treatment, and the aluminum cabinet coating of preparation has good adhesive force, it is possible to the life-span effectively promote the corrosion-resistant bubbling of coating, coming off.And the sprayed plastic coat structure that the present invention is formed can promote the fade resistant of light colored coating, the loss of gloss ageing properties such as cabinet panel champagne gold. The present invention can anticorrosion weather-proof life-span of significant increase inverter aluminum cabinet. Present invention process is simple and environmentally-friendly, cost is low, is widely portable to the application of coatings for aluminum materials through engineering approaches.
The processing technique of the present invention is as follows: 1) aluminium plate wire drawing; 2) aluminium plate solder side polishing; 3) hot water wash; 4) ungrease treatment; 5) at least twice washing; 6) table mediates reason; 7) bonderizing; 8) at least one washing; 9) pure water is washed; 10) dry; 11) pre-treatment detection; 12) surface dust processes; 13) plastic-blasting colour developing primary coat coating; 14) baking-curing; 15) plastic-blasting transparent area coating layer; 16) baking-curing.
In the present embodiment, step 8) adopt twice washing, and aluminium plate is processed into outdoor inverter aluminum cabinet, therefore, the processing technique step of the present embodiment includes successively: 1) aluminium plate wire drawing; 2) cabinet solder side polishing; 3) hot water wash; 4) alkalescence ungrease treatment; 5) washing 1; 6) washing 2; 7) table mediates reason; 8) bonderizing; 9) washing 3; 10) pure water is washed; 11) dry; 12) pre-treatment detection; 13) surface dust processes; 14) plastic-blasting colour developing primary coat coating; 15) baking-curing 1; 16) plastic-blasting transparent area coating layer; 17) baking-curing 2.
1) aluminium plate wire drawing processes: the two sides of aluminium plate is all carried out wharf's pavement quality, makes the surface roughness of aluminium plate be not less than Sa2.5. Specifically, aluminium plate wire drawing processes: aluminium plate adopts wire drawing machine that two sides all carries out wharf's pavement quality before panel beating cabinet, surface of aluminum plate roughness is made to reach Sa2.5, fundamentally remove oxide layer and the pollutant of plate surface, and the adhesive force of higher roughness increase later stage spray-on coating can be passed through. Described aluminium sheet is 5 is aluminium sheet, and thickness of slab is not more than 3mm.
2) aluminium plate solder side polishing: remove the oxide skin of aluminium plate welding position, flatten solder side simultaneously. Specifically, cabinet solder side is polished: aluminium sheet panel beating becomes cabinet to remove the oxide skin of cabinet welding position with grinder buffing later, flattens solder side simultaneously.
3) hot water wash: adopt infusion method, adopts the obstinate oil stain produced in hot-water soak softening panel beating process to aluminium plate; Technological parameter: solvent, fresh water (FW); Temperature, 70 DEG C, soak time, 2～3min, can fully soften obstinate oil stain.
4) ungrease treatment: adopt infusion method to carry out ungrease treatment, technological parameter: degreasing agent content: 5% (vol%), temperature: 40～55 DEG C; Soak time: 5～10min; Dustiness :≤4g/L; Total alkalinity TB:6～20 point; Free alkalinity FB:4～10 point. Carry out twice washing process and step 5 after defat respectively), 6), washing process: adopt soak water clean, solvent: fresh water (FW); Temperature: room temperature (15～25 DEG C); Soak time: 3～5min; Gross contamination degree :≤0.5 point. Long defat realizes aluminium plate at application front surface without any oils and fats, and is again cleared up the pollution of surface of aluminum plate by twice washing, increases coating adhesion.
7) table mediates reason: adopts Henkel table to adjust and soaks table tune; Degreasing agent: percentage by volume vol% is 0.03～0.04% (PH:8～9.5); Temperature: room temperature (15～25 DEG C); Time: 2～3min.
8) bonderizing: adopt and soak phosphatization, solution: 5% Zinc phosphating solution (PH:3～3.5) (wt%); Temperature: 35～45 DEG C;Time: 6～10min; Total acidity TA:17～25 point; Free acidity FA:0.8～1.2 point (methyl orange); Accelerator: 2～4 points (sodium nitrite). Environmental protection zinc phosphating film without chromium can increase coating adhesion and antiseptic property.
Carry out one washing 9 after phosphatization respectively) and together pure water wash 10) process, washing process: adopt soak water clean, solvent: fresh water (FW); Temperature: room temperature (15～25 DEG C); Soak time: 3～5min; Gross contamination degree :≤0.5 point. Pure washing process: adopt spray pure water to clean, solvent: fresh water (FW) (conductivity≤22 μ Ω cm, PH:6～9); Spray hydraulic pressure: 0.12～0.18MPa; Temperature: room temperature (15～25 DEG C); Soak time: 3～4min; Gross contamination degree :≤0.2 point. The pure water of low conductivity is washed and can be realized at aluminium sheet clean enough before application, removes contaminated ion interference.
11) drying and processing: put into oven for drying after the washing of aluminum cabinet and process, fully dries the steam in the water stain and cabinet surface micropore in cabinet surface and structure gap thereof. Dry temperature: 80～110 DEG C; Time: 20～30min.
Step 12 is carried out after drying) check phosphorization film quality, phosphating coat need to be uniform grey or Dark grey, then carries out step 13) inspection phosphating coat surface whether dust, there is dust and then carry out process of doing over again.
14) plastic-blasting colour developing primary coat coating: adopt dry compression air again to blow off cabinet surfaces externally and internally before plastic-blasting. The then colour developing primary coat coating of plastic-blasting 80～100 μ m-thick, described plastic-blasting electrostatic 75KV; Described colour developing primary coat coating is the light tone open air powder coatings such as champagne gold, and described outdoor powder coating is polyester resin coating.
Primary coat coating enters baking oven and carries out step 15) preliminary baking-curing, adopt 180 DEG C of baking-curing 5～10min, it is achieved primary coat coated semi solid state.
16) plastic-blasting transparent area coating layer: direct plastic-blasting transparent area coating layer after primary coat coating is in semi-cured state, coating layer thickness is 60～80 μm, described plastic-blasting electrostatic 75KV; Described transparent area coating layer is transparent outdoor fluororine-carbon coating, and surface is zero diopter state, light transmittance 80%.
Enter baking oven after topcoating coating plastic-blasting and carry out step 17) baking-curing, adopt 180 DEG C of baking-curing 15～25min, realizing the abundant solidification of topcoating coating, also ensure that the primary coat being in internal layer colour developing coating is fully cured simultaneously, two layers of coatings increases the anticorrosion weather resistance of aluminium sheet cabinet.
The surface plastic spraying method of the present invention can be used for the service life improving aluminum cabinet coating under high salt fog, intense light irradiation outdoor environment, and the method includes workmanship of spraying plastics method and the panel plastic-blasting step of aluminum cabinet.
This workmanship of spraying plastics method is more environmentally-friendly, and the traditional Coating Pretreatment of aluminum alloy plate materials is to adopt poisonous chromate treating, by having etched away the oxide layer of aluminium material surface, application process is carried out, it is achieved the high adhesion force of coating and antiseptic property on the surface of fresh aluminium material surface or formation chromaking film. The present invention then adopts the method that aluminium wire drawing processes, be processed into the products such as cabinet at aluminium plate before, wire drawing is cleaned out to the oxide-film on surface and main oil layer, both the roughness of plate surface had been increased, it is easy to the adhesive force of later stage application coating, again can the disposable pollution removing aluminium plate surface comparatively up hill and dale. After being processed into cabinet product, the oxide layer of the topical product such as welding is cleaned out by sand paper/grinder buffing, so can ensure aluminium plate product surface non-oxidation pollution layer before application.Follow-up adopt defat comparatively fully to dispose the oils and fats brought by panel beating again to pollute, and the bonderizing in conjunction with environmental protection forms phosphating coat in aluminum alloy surface, it is ensured that Rolled Aluminum Material Surface Quality before application. Process of the present invention can realize and the chromate treating method aluminium sheet Coating Pretreatment quality also in conjunction with power, reaches to give up the purpose of the chromate treating step having pollution.
Coating adhesion prepared by this method can reach 0 grade (GB1720-82 " paint film adhesion algoscopy ") by hundred lattice tests; And this performance that can effectively promote the corrosion-resistant bubbling of coating, come off, there is longer anti-corrosion life; Cabinet aluminium faceplate coating structure under this process has better weather resistance, be ensure that light tone and the coating texture states such as the champagne gold of appearance of coat by transparent area coating layer, it is ensured that appearance of coat air improves grade; And the fluorine carbon clear coat of topcoating coating can completely cut off the pollution factors such as air, bottom layer champagne gilt subsequent oxidation etc. in use is prevented to fade chemical reaction, it is ensured that fading the life-span of the resistance to illumination of coating. The high-weatherability of fluorine carbon clear coat itself and its zero diopter state increase the reflectance to sunlight, reduce the heat absorption of coating surface, are conducive to the heat radiation of rack and coating to protect color. This coating structure has passed through phosphating coat and two-layer organic coating synergism simultaneously, adds the weather-proof life-span of coating.
Outdoor inverter all can be provided reliable anticorrosion weather-proof protection by aluminum cabinet coating prepared by the present invention under coastal environments, Heavy Industrial environment. Additionally, this method is simple to operate, environmental protection, cost are low, it is widely used in finishing line and produces running.
Additionally, aluminium plate anticorrosion weathering resistance coatings prepared by present invention process method is under the premise that ensure that coating adhesion and high antiseptic property, by primary coat colour developing, topcoating isolation atmospheric oxidn and corrosion, it is achieved that the high fade resistant performance of coating and high durable life-span.
To this, the present invention has done the test of 5 batches in batches, and each batch of cabinet sample is 10.
Batch 1: using 5 is the aluminium sheet cabinet workmanship of spraying plastics method plastic-blasting open air polyester resin powder coating according to the present invention, and cabinet coating is through the continuous neutral salt spray test of 1000h (GB/T10125-1997). Cabinet sprayed plastic coat is without any corrosion bubbling, corrosion, and coating is corrosion-resistant, peeling resistance is good.
Batches 2: using 5 is the aluminium sheet cabinet workmanship of spraying plastics method plastic-blasting open air polyester resin powder coating according to the present invention, cabinet coating is drawn after fork through the continuous neutral salt spray test of 1000h (GB/T10125-1997). Coating draws fork position and periphery thereof without any corrosion bubbling, corrosion, and after drawing fork bit trial with standard adhesive plaster adhesive coating, coating is without coming off, and coating adhesion is good.
Batches 3: using 5 is the aluminium sheet cabinet workmanship of spraying plastics method plastic-blasting open air polyester resin powder coating according to the present invention, cabinet coating carries out corrosion examination according to the harsh grade of GB/T2423.18-2000 1 grade: the neutral salt spray test of 4 spray cycles, each 2h sprays, and carries out a humid storage cycle of 7 days by a definite date (40 DEG C) after each spray cycles. After amounting to 680h corrosion, cabinet sprayed plastic coat is without any corrosion bubbling, corrosion, and coating is corrosion-resistant, peeling resistance is good. Plastic-blasting cabinet meets the salt fog standard of harsh grade 1 grade, it was shown that this aluminum cabinet is applicable to, at marine environment or in the corrosion class of offshore area C5-M, can be exposed in coastal high salt fog corrosive environment for a long time and use safely.
Batches 4: using 5 is aluminium sheet cabinet panel according to the workmanship of spraying plastics method plastic-blasting champagne gold open air polyester resin powder coating of the present invention and transparent fluororine-carbon coating, transparent fluororine-carbon coating uniform fold is on champagne gilt surface, having good light transmittance, panel shows as good champagne gilt outward appearance. Faceplate coating carries out according to Ultraluminescence aging testing method (ASTMG154 standard), UV-A340 Burdick lamp is adopted to be irradiated, expose circulation to the open air: 8h illumination, 4h dark high humidity, blackboard temperature respectively 60 ± 3 DEG C, 50 ± 3 DEG C, totally 84 test cycles (1008h). After test, sprayed plastic coat color is without obvious variable color (fading), loss of gloss; Without abnormal phenomenas such as efflorescence, bubble, cracking, peelings.
Batches 5: using 5 is aluminium sheet cabinet panel according to the workmanship of spraying plastics method plastic-blasting champagne gold open air polyester resin powder coating of the present invention and transparent fluororine-carbon coating, transparent fluororine-carbon coating uniform fold is on champagne gilt surface, having good light transmittance, panel shows as good champagne gilt outward appearance. Faceplate coating carries out according to xenon lamp aging wire examination method (GB/T1865-2009 paint and varnish artificial weathering aging and man-made radiation's exposure test method); Light source: 340nm wavelength, average irradiance: 0.51W/m2. Water spray 5min, dries 25min with xenon lamp, carries out 2000 circulations, 1000h altogether. Temperature and humidity value during test is respectively as follows: 65 DEG C and 65%. After test, sprayed plastic coat color is without obvious variable color, loss of gloss; It is qualified without abnormal phenomenas such as efflorescence, bubble, cracking, peelings.
In sum, the present invention has abandoned poisonous chromate treating, it is achieved that the high adhesion force of aluminium sheet application coating, it is possible to effectively promote the corrosion-resistant bubbling of coating, shrinkage cavity, life-span of coming off, the especially service life under high salt fog, intense light irradiation outdoor environment.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (10)
1. one kind realizes the surface plastic spraying method that aluminium plate anticorrosion is weather-proof, it is characterised in that: aluminium plate included following processing technique successively before workmanship of spraying plastics: 1) aluminium plate wire drawing; 2) aluminium plate solder side polishing; 3) hot water wash; 4) ungrease treatment; 5) at least twice washing; 6) table mediates reason; 7) bonderizing; 8) at least one washing; 9) pure water is washed; 10) dry; 11) pre-treatment detection; 12) surface dust processes.
2. according to claim 1 realize the surface plastic spraying method that aluminium plate anticorrosion is weather-proof, it is characterised in that: aluminium plate wire drawing processes: the two sides of aluminium plate is all carried out wharf's pavement quality, makes the surface roughness of aluminium plate be not less than Sa2.5.
3. according to claim 1 realize the surface plastic spraying method that aluminium plate anticorrosion is weather-proof, it is characterised in that: aluminium plate solder side is polished: removes the oxide skin of aluminium plate welding position, flattens solder side simultaneously.
4. according to claim 1 realize the surface plastic spraying method that aluminium plate anticorrosion is weather-proof, it is characterised in that: hot water wash: adopt infusion method that aluminium plate adopts the obstinate oil stain produced in hot-water soak softening panel beating process; Technological parameter: solvent, fresh water (FW); Temperature, 70 DEG C, soak time, 2～3min.
5. according to claim 1 realize the surface plastic spraying method that aluminium plate anticorrosion is weather-proof, it is characterised in that: ungrease treatment: adopt infusion method to carry out ungrease treatment, technological parameter: degreasing agent content: percentage by volume vol% is 5%, temperature: 40～55 DEG C;Soak time: 5～10min; Dustiness :≤4g/L; Total alkalinity TB:6～20 point; Free alkalinity FB:4～10 point;
Carry out twice washing process, step 5 after defat respectively) washing process: adopt soak water clean, solvent: fresh water (FW); Temperature: 15～25 DEG C; Soak time: 3～5min; Gross contamination degree :≤0.5 point.
6. according to claim 1 realize the surface plastic spraying method that aluminium plate anticorrosion is weather-proof, it is characterised in that: table mediates reason: adopts Henkel table to adjust and soaks table and adjust; The degreasing agent of PH:8～9.5: percentage by volume vol% is 0.03～0.04%; Temperature: 15～25 DEG C; Time: 2～3min.
7. according to claim 1 realize the surface plastic spraying method that aluminium plate anticorrosion is weather-proof, it is characterised in that: bonderizing: adopt and soak phosphatization, solution: PH be 3～3.5 and mass percent wt% be the Zinc phosphating solution of 5%; Temperature: 35～45 DEG C; Time: 6～10min; Total acidity TA:17～25 point; The methyl orange of free acidity FA:0.8～1.2; Accelerator: the sodium nitrite of 2～4;
Carry out respectively after phosphatization one washing with together with pure water wash process, step 8) washing process: adopt soak water clean, solvent: fresh water (FW); Temperature: 15～25 DEG C; Soak time: 3～5min; Gross contamination degree :≤0.5 point;
Pure washing process: adopt spray pure water to clean, solvent: fresh water (FW), conductivity≤22 μ Ω cm, PH:6～9; Spray hydraulic pressure: 0.12～0.18MPa; Temperature: 15～25 DEG C; Soak time: 3～4min; Gross contamination degree :≤0.2 point.
8. according to claim 1 realize the surface plastic spraying method that aluminium plate anticorrosion is weather-proof, it is characterised in that: drying and processing: put into oven for drying after washing and process, what fully dry in the structure gap between aluminium plate surface and adjacent aluminum plates material is water stain; Dry temperature: 80～110 DEG C; Time: 20～30min; Checking phosphorization film quality after drying, phosphating coat need to be uniform grey or Dark grey, inspection phosphating coat surface whether dust, there is dust and then carries out process of doing over again.
9. according to claim 1 realize the surface plastic spraying method that aluminium plate anticorrosion is weather-proof, it is characterised in that: workmanship of spraying plastics includes: 13) plastic-blasting colour developing primary coat coating; 14) baking-curing; 15) plastic-blasting transparent area coating layer; 16) baking-curing;
Plastic-blasting colour developing primary coat coating: adopt dry compression air again to blow off aluminium plate surfaces externally and internally before plastic-blasting; The then colour developing primary coat coating of plastic-blasting 80～100 μ m-thick, plastic-blasting electrostatic 75KV; Primary coat coating enters baking oven and carries out preliminary baking-curing, adopts 180 DEG C of baking-curing 5～10min, it is achieved primary coat coated semi solid state;
Plastic-blasting transparent area coating layer: direct plastic-blasting transparent area coating layer after primary coat coating is in semi-cured state, coating layer thickness is 60～80 μm, plastic-blasting electrostatic 75KV; Enter baking oven after topcoating coating plastic-blasting and carry out baking-curing, adopt 180 DEG C of baking-curing 15～25min, it is achieved the abundant solidification of coating.
10. an aluminium plate, it is characterised in that: its surface adopts and realizes the surface plastic spraying method process that aluminium plate anticorrosion is weather-proof as in one of claimed in any of claims 1 to 9; The surface of aluminium plate sequentially forms phosphorization membrane, colour developing primary coat coating, transparent area coating layer.
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