CN105364637A - Surface treatment method of aluminum alloy shell - Google Patents
Surface treatment method of aluminum alloy shell Download PDFInfo
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- CN105364637A CN105364637A CN201510642064.6A CN201510642064A CN105364637A CN 105364637 A CN105364637 A CN 105364637A CN 201510642064 A CN201510642064 A CN 201510642064A CN 105364637 A CN105364637 A CN 105364637A
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- alloy casing
- wire
- wire drawing
- carried out
- treatment method
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Classifications
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/06—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for producing matt surfaces, e.g. on plastic materials, on glass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C11/00—Selection of abrasive materials or additives for abrasive blasts
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention provides a surface treatment method of an aluminum alloy shell, the surface treatment method comprises the following steps that S1, wire drawing is carried out on the side face of the aluminum alloy shell, and a wire-drawn surface is obtained; S2, sand blasting is carried out on the non-wire-drawn surface of the aluminum alloy shell; S3, anodic oxidation treatment is carried out on the whole aluminum alloy shell obtained after wire drawing and sand blasting, and an oxidation film layer is formed; and S4, hole sealing treatment is carried out on the aluminum alloy shell obtained after anodic oxidation treatment, and the aluminum alloy shell obtained after side face wire drawing and non-wire-drawn surface sand blasting is obtained. According to the surface treatment method of the aluminum alloy shell, the appearance of the aluminum alloy shell is rich and diverse.
Description
Technical field
The invention belongs to the technical field of surface of metal material, particularly relate to a kind of surface treatment method of Al-alloy casing.
Background technology
Aluminium alloy is a most widely used class non-ferrous metal structural material in industry, widely applies in Aeronautics and Astronautics, automobile, machine-building, boats and ships and chemical industry.The develop rapidly of industrial economy, increasing to the demand of Welded structural member, make the Research on Weldability of aluminium alloy also thereupon deeply.Maximum alloys applied by aluminum current alloy.
The progress of science and technology brings great convenience to our life, and mobile phone has become indispensable product in our daily life.Because 5 series (as 5052) and 6 series are (as 6061,6063) the aluminium alloy anode oxide effect of material is better, the aluminium alloy that the many employings of battery cover these two kinds of current various mobile phone are serial, but the process of surface treatment of these two kinds serial aluminum alloy materials is all do anodic oxidation after sandblasting, appearance lacks novelty.
CN104805485A discloses a kind of pack alloy surface treatment method, relates to field of metal surface treatment technology.This pack alloy surface treatment method comprises the following steps: S10, pack alloy is carried out grinding process; S20, the pack alloy after grinding process is carried out blasting treatment; S30, the pack alloy after blasting treatment is carried out anodized, form oxidation film layer on pack alloy surface; S40, the pack alloy after anodized carried out dyeing process; S50, by dyeing process after pack alloy carry out sealing pores.CN102582339A discloses a kind of method at the double-colored wire drawing plated film of aluminum alloy surface: by the pre-treatment of aluminium alloy blank; Al-alloy parts through pre-treatment is carried out anodic oxidation dyeing; After the Al-alloy parts drying and processing of dyeing, enter physical vapour deposition (PVD) plating stove; By the workpiece vacuum moulding machine color film of gained; The Al-alloy parts of plating color film is carried out wire drawing, the lines needed for pull-out; By the wire drawing workpiece coating hood finish coat varnish obtained, obtain the surperficial aluminium alloy through double-colored wire drawing plated film.But the appearance of the aluminium alloy that described surface treatment method obtains is still rich and varied not.
Summary of the invention
For prior art Problems existing, the object of the present invention is to provide a kind of surface treatment method of Al-alloy casing, described surface treatment method can make the outward appearance of Al-alloy casing have rich and varied effect.
For reaching this object, the present invention by the following technical solutions:
A surface treatment method for Al-alloy casing, described surface treatment method comprises the steps:
S1, by the side wire drawing of Al-alloy casing, obtains wire-drawing surface;
The non-wire-drawing surface of Al-alloy casing is carried out blasting treatment by S2;
Al-alloy casing entirety after wire drawing and blasting treatment is carried out anodized by S3, forms oxidation film layer;
Al-alloy casing after anodized is carried out sealing pores by S4, obtains the Al-alloy casing in side wire drawing, non-wire drawing facing sand face.
Housing of the present invention refers to and is surrounded by inside and outside two curved surfaces, and thickness is much smaller than the laminated structure of middle minimum profile curvature radius and planar dimension.The positive camber of side is removed in the front of described housing namely, represents the face of thickness of shell in side and positive camber.Typical but non-limiting Al-alloy casing is aluminium alloy mobile phone battery cover.
The surface treatment method of Al-alloy casing provided by the invention, first wire drawing process is carried out in the side of Al-alloy casing, obtain wire-drawing surface, afterwards the non-wire-drawing surface of Al-alloy casing is carried out blasting treatment, then anodized is carried out to whole housing, finally more whole housing is carried out sealing pores, wire drawing in process, sandblasting and anodic oxidation cooperatively interact, therefore, the Al-alloy casing appearance after process is rich and varied, can meet the demand of modern people to product appearance.
Also step S31 is carried out: the Al-alloy casing after antianode oxidation processes carries out dyeing process after step S3 He before step S4;
Preferably, the coloring agent used in described dyeing process is golden coloring agent, blue dyeing agent or black dye.If want the Al-alloy casing producing aluminium alloy true qualities, then need not dye.
Step S1 adopts craft or wire drawing machine to carry out wire drawing to the side of Al-alloy casing, and described wire drawing can be horizontal wire drawing, longitudinal wire drawing or oblique wire drawing.
Preferably, in described wire drawing machine, the model of pulling wheel is 20-800 order, as 50 orders, 80 orders, 100 orders, 200 orders, 300 orders, 400 orders, 500 orders, 600 orders, 700 orders or 800 orders etc.
Preferably, the rotating speed of described wire drawing machine is 1800-2400r/min, as 1900r/min, 2000r/min, 2100r/min, 2200r/min, 2300r/min or 2350r/min etc.
Preferably, described in step S1, the speed of travel of Al alloy shell body side surface described in wire drawing process is 2-30m/min, as 5m/min, 8m/min, 10m/min, 15m/min, 20m/min, 25m/min or 28m/min etc.
Preferably, the outlet scope of wire drawing process described in step S1 is 0.1-2.5mm, as 0.2mm, 0.3mm, 0.5mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.2mm or 2.4mm etc., described wire drawing outlet scope refers to the width of product silk.
Step S2 is specially: protect with the non-wire-drawing surface of tool by Al-alloy casing, spray sandblast resistant durable ink afterwards, tool is removed, then carry out blasting treatment to non-wire-drawing surface, divested by sandblast resistant durable ink after blasting treatment on wire-drawing surface.
The optional sandblasting by hand of blasting treatment described in step S2 or machine sandblasting, described blasting treatment is combined as material spray with a kind of in glass sand, steel sand or zircon sand or at least two kinds.
Preferably, described sand mold is 80-220 order, as 85 orders, 90 orders, 100 orders, 120 orders, 150 orders, 180 orders, 200 orders or 210 orders etc.
Preferably, the pressure of blasting treatment described in step S2 is 1.0-2.5kg/cm
2, as 1.2kg/cm
2, 1.5kg/cm
2, 1.8kg/cm
2, 2.0kg/cm
2, 2.2kg/cm
2or 2.4kg/cm
2deng.
Preferably, described in step S2 during blasting treatment, the speed of travel of the non-wire-drawing surface of Al-alloy casing is 8-15m/min, as 9m/min, 10m/min, 11m/min, 12m/min, 13m/min or 14m/min etc.
Blasting treatment can be cleared up and alligatoring aluminum alloy surface, improves its mechanical performance, and makes its surface presentation matt effect.
Also following steps are carried out after step S2 He before step S3:
Al-alloy casing after wire drawing process and blasting treatment is carried out ungrease treatment by S21;
Al-alloy casing after ungrease treatment is carried out alkaline etching by S22;
The black film that S23 produces after removing alkaline etching process;
The Al-alloy casing removed after black film is carried out chemical polishing by S24.
Step S21 adopts the mixed liquor of tertiary sodium phosphate, NPE and dodecyl sodium sulfate to carry out ungrease treatment.
Preferably, the concentration of tertiary sodium phosphate is 50-60g/L, as 52g/L, 53g/L, 54g/L, 55g/L, 56g/L, 57g/L, 58g/L or 59g/L etc., the concentration of NPE is 2-8mL/L, as 3mL/L, 4mL/L, 5mL/L, 6mL/L, 7mL/L or 8mL/L etc., dodecyl sodium sulfate 0.5-2g/L, as 0.8g/L, 1.0g/L, 1.2g/L, 1.5g/L or 1.8g/L etc.
Preferably, ungrease treatment described in step S21 is carried out under 50-60 DEG C of condition, as carried out at 52 DEG C, 53 DEG C, 54 DEG C, 55 DEG C, 57 DEG C or 59 DEG C.
Preferably, the time of ungrease treatment described in step S21 is 3-5min, as 3min, 4min or 5min etc.
Step S22 adopts sodium hydroxide solution to carry out alkaline etching process.
Preferably, the concentration of described sodium hydroxide solution is 50-60g/L, as 52g/L, 53g/L, 54g/L, 55g/L, 56g/L, 57g/L, 58g/L or 59g/L etc.
Preferably, the temperature of alkaline etching process described in step S22 is 55-65 DEG C, as 56 DEG C, 58 DEG C, 60 DEG C, 62 DEG C, 63 DEG C or 64 DEG C etc.
Preferably, the time of alkaline etching process described in step S22 is 5-30s, as 6s, 7s, 8s, 10s, 15s, 18s, 20s, 22s, 25s or 28s etc.
Black film after step S23 adopts salpeter solution to remove alkaline etching process.
Preferably, the concentration of described salpeter solution is 200-400mL/L, as 210mL/L, 220mL/L, 240mL/L, 260mL/L, 300mL/L, 320mL/L, 340mL/L or 380mL/L etc.
Preferably, the time of described salpeter solution process is 10-60s, as 12s, 15s, 18s, 20s, 22s, 25s, 28s, 30s, 35s, 40s, 45s, 50s or 55s etc.
Preferably, chemical polishing described in step S24 is carried out in the mixed liquor of phosphoric acid and nitric acid.
Preferably, in described mixed liquor, the percentage by volume of phosphoric acid is 93%, and the percentage by volume of nitric acid is 7%.
Preferably, described phosphoric acid to be mass percentage be 98% phosphoric acid, described nitric acid to be mass percentage be 68% nitric acid.
Preferably, the time of chemical polishing described in step S24 is 5-60s, as 8s, 10s, 12s, 15s, 18s, 20s, 22s, 25s, 28s, 30s, 35s, 40s, 45s, 50s or 55s etc.
Anodized described in step S3 is carry out in the sulfuric acid solution of 150-220g/L in concentration, as in concentration be 155g/L, 165g/L, 175g/L, 180g/L, 195g/L or 210g/L etc. sulfuric acid solution in carry out.
Preferably, the voltage of anodized described in step S3 is 8-16V, and as 9V, 10V, 11V, 12V, 14V, 15V or 15.5V etc., current density is 1-1.5A/dm
2, as 1.1A/dm
2, 1.2A/dm
2, 1.3A/dm
2, 1.4A/dm
2or 1.5A/dm
2deng.
Preferably, the time of anodized described in step S3 is 30-60min, as 33min, 35min, 38min, 40min, 42min, 45min, 50min, 55min or 58min etc.
Preferably, the thickness of oxidation film layer described in step S3 is 5-15 μm, as 6 μm, 8 μm, 10 μm, 12 μm, 13 μm or 14 μm etc.
Aluminum alloy surface after anodized forms one deck oxidation film, and the corrosion resistance of Al alloy shell surface is improved.
The object of sealing pores described in step S4 is the corrosion-resistant and antifouling property improving product, and the dyestuff after dyeing can be avoided to overflow simultaneously.
Compared with prior art, beneficial effect of the present invention is:
The surface treatment method of Al-alloy casing provided by the invention, first carries out wire drawing process to the side of Al-alloy casing, carries out blasting treatment afterwards, then carry out anodized to whole housing to the non-wire-drawing surface of Al-alloy casing; Described wire drawing process can obtain different outlet scopes, and wire drawing is various informative, can be horizontal wire drawing, longitudinal wire drawing, side direction wire drawing or screw thread wire drawing; Described blasting treatment uses different material sprays can obtain the sand sense of variable grain size; Described anodized can improve the corrosion resistance of Al-alloy casing; Described wire drawing process, blasting treatment and anodized cooperatively interact, and make the Al-alloy casing rich color after processing, outward appearance is various.
Accompanying drawing explanation
Fig. 1 is the process flow for carrying out surface treatment figure of the Al-alloy casing that embodiment 1 provides.
Detailed description of the invention
Technical scheme of the present invention is further illustrated by detailed description of the invention below in conjunction with accompanying drawing.
Embodiment 1
As shown in Figure 1, described process of surface treatment comprises the steps: the process of surface treatment of Al-alloy casing
S1 side wire drawing: by the side wire drawing of Al-alloy casing, obtain wire-drawing surface;
Non-wire-drawing surface tool protects by S2;
S3 sprays sandblast resistant durable ink on wire-drawing surface;
Tool is removed by S4;
S5 non-wire-drawing surface blasting treatment: the non-wire-drawing surface of Al-alloy casing is carried out blasting treatment;
S6 shells ink: divested by the ink on wire-drawing surface;
S7 alkaline etching: the Al-alloy casing after stripping ink is carried out ungrease treatment;
S8 degreasing: the Al-alloy casing after ungrease treatment is carried out alkaline etching;
S9 desmut: the black film produced after removing alkaline etching process;
S10 chemical polishing: the Al-alloy casing removed after black film is carried out chemical polishing;
S11 anodic oxidation: the Al-alloy casing entirety after chemical polishing is carried out anodized, forms oxidation film layer;
S12 dyes: the Al-alloy casing after antianode oxidation processes carries out dyeing process.
S13 sealing of hole: the Al-alloy casing after dyeing is carried out sealing pores, obtains the Al-alloy casing in side wire drawing, non-wire drawing facing sand face.
Embodiment 2
A process of surface treatment for Al-alloy casing, comprises the steps:
S1 side wire drawing: the side wire drawing machine of Al-alloy casing is carried out horizontal wire drawing, the model of pulling wheel is 800 orders, and wire drawing walking speed is 30m/min, and the rotating speed of wire drawing machine is 1800r/min, and outlet scope is 0.1mm, obtains wire-drawing surface;
S2 wire-drawing surface oil spout ink: non-wire-drawing surface tool is protected, sprays sandblast resistant durable ink afterwards on wire-drawing surface, then tool is removed, obtain the Al-alloy casing of side oil spout ink;
The non-wire-drawing surface of S3 carries out blasting treatment: the non-wire-drawing surface of Al-alloy casing is carried out blasting treatment, and material spray is the combination of a kind of in glass sand, steel sand or zircon sand or at least two kinds, and sand mold is 220 orders, and sand grains size is 0.05mm, and blasting pressure is 2.5kg/cm
2, sandblasting walking speed is 15m/min;
S4 shells ink: divested by the ink on wire-drawing surface;
S5 degreasing: the Al-alloy casing after wire drawing process and blasting treatment is carried out ungrease treatment, the solution of ungrease treatment is the mixed liquor of tertiary sodium phosphate, NPE and dodecyl sodium sulfate, wherein the concentration of tertiary sodium phosphate is 50g/L, the concentration of NPE is 5mL/L, the concentration of dodecyl sodium sulfate is 1g/L, the temperature of ungrease treatment is 50 DEG C, and the time is 3min;
S6 alkaline etching: be 50g/L in concentration by the Al-alloy casing after ungrease treatment, temperature is carry out alkaline etching process 5-30s in the sodium hydroxide solution of 60 DEG C;
S7 desmut: the Al-alloy casing after alkaline etching process being immersed in concentration is 10-60s in the nitric acid of 300mL/L, removes the black film that alkaline etching process produces;
S8 chemical polishing: the Al-alloy casing removed after black film is carried out chemical polishing 5-60s in the mixed liquor of phosphoric acid and nitric acid, wherein, in mixed liquor, the percentage by volume of phosphoric acid is 93%, the percentage by volume of nitric acid is 7%, described phosphoric acid to be mass percentage be 98% phosphoric acid, described nitric acid to be mass percentage be 68% nitric acid;
S9 anodic oxidation: be carry out anodized in the sulfuric acid solution of 150g/L in concentration by the Al-alloy casing after chemical polishing, anodised voltage is 8V, and current density is 1A/dm
2, the time is 30-60min, forms 5-15 μm of thick oxidation film layer;
S10 dyes: the Al-alloy casing after antianode oxidation processes carries out dyeing process.
S11 sealing of hole: the Al-alloy casing after dyeing process is carried out sealing pores, obtains the Al-alloy casing in side wire drawing, non-wire drawing facing sand face.
Al-alloy casing appearance looks elegant after process.
Embodiment 3
A process of surface treatment for Al-alloy casing, comprises the steps:
S1 side wire drawing: the side wire drawing machine of Al-alloy casing is carried out longitudinal wire drawing, the model of pulling wheel is 20 orders, and wire drawing walking speed is 2m/min, and the rotating speed of wire drawing machine is 2400r/min, and outlet scope is 2.5mm, obtains wire-drawing surface;
S2 wire-drawing surface oil spout ink: non-wire-drawing surface tool is protected, sprays sandblast resistant durable ink afterwards on wire-drawing surface, then tool is removed, obtain the Al-alloy casing of side oil spout ink;
The non-wire-drawing surface of S3 carries out blasting treatment: the non-wire-drawing surface of Al-alloy casing is carried out blasting treatment, and material spray is the combination of a kind of in glass sand, steel sand or zircon sand or at least two kinds, and sand mold is 80 orders, and sand grains size is 0.178mm, and blasting pressure is 1.0kg/cm
2, sandblasting walking speed is 8m/min;
S4 shells ink: divested by the ink on wire-drawing surface;
S5 degreasing: the Al-alloy casing after wire drawing process and blasting treatment is carried out ungrease treatment, the solution of ungrease treatment is the mixed liquor of tertiary sodium phosphate, NPE and dodecyl sodium sulfate, wherein the concentration of tertiary sodium phosphate is 60g/L, the concentration of NPE is 2mL/L, the concentration of dodecyl sodium sulfate is 0.5g/L, the temperature of ungrease treatment is 60 DEG C, and the time is 5min;
S6 alkaline etching: be 60g/L in concentration by the Al-alloy casing after ungrease treatment, temperature is carry out alkaline etching process 30s in the sodium hydroxide solution of 55 DEG C;
S7 desmut: the Al-alloy casing after alkaline etching process being immersed in concentration is 60s in the nitric acid of 200mL/L, removes the black film that alkaline etching process produces;
S8 chemical polishing: the Al-alloy casing removed after black film is carried out chemical polishing 60s in the mixed liquor of phosphoric acid and nitric acid, wherein, in mixed liquor, the percentage by volume of phosphoric acid is 93%, the percentage by volume of nitric acid is 7%, described phosphoric acid to be mass percentage be 98% phosphoric acid, described nitric acid to be mass percentage be 68% nitric acid;
S9 anodic oxidation: be carry out anodized in the sulfuric acid solution of 220g/L in concentration by the Al-alloy casing after chemical polishing, anodised voltage is 16V, and current density is 1.5A/dm
2, the time is 30-60min, forms 5-15 μm of thick oxidation film layer;
S10 dyes: the Al-alloy casing after antianode oxidation processes carries out dyeing process.
S11 sealing of hole: the Al-alloy casing after dyeing is carried out sealing pores, obtains the Al-alloy casing in side wire drawing, non-wire drawing facing sand face.
Al-alloy casing appearance looks elegant after process.
Embodiment 4
A process of surface treatment for Al-alloy casing, comprises the steps:
S1 side wire drawing: the side wire drawing machine of Al-alloy casing is carried out screw thread wire drawing process, the model of pulling wheel is 50 orders, and wire drawing walking speed is 25m/min, and the rotating speed of wire drawing machine is 2000r/min, and outlet scope is 1.0mm, obtains wire-drawing surface;
S2 wire-drawing surface oil spout ink: non-wire-drawing surface tool is protected, sprays sandblast resistant durable ink afterwards on wire-drawing surface, then tool is removed, obtain the Al-alloy casing of side oil spout ink;
The non-wire-drawing surface of S3 carries out blasting treatment: the non-wire-drawing surface of Al-alloy casing is carried out blasting treatment, and material spray is the combination of a kind of in glass sand, steel sand or zircon sand or at least two kinds, and sand mold is 100 orders, and sand grains size is 1mm, and blasting pressure is 1.5kg/cm
2, sandblasting walking speed is 10m/min;
S4 shells ink: divested by the ink on wire-drawing surface;
S5 degreasing: the Al-alloy casing after wire drawing process and blasting treatment is carried out ungrease treatment, the solution of ungrease treatment is the mixed liquor of tertiary sodium phosphate, NPE and dodecyl sodium sulfate, wherein the concentration of tertiary sodium phosphate is 55g/L, the concentration of NPE is 8mL/L, the concentration of dodecyl sodium sulfate is 2g/L, the temperature of ungrease treatment is 55 DEG C, and the time is 3-5min;
S6 alkaline etching: be 55g/L in concentration by the Al-alloy casing after ungrease treatment, temperature is carry out alkaline etching process 5-30s in the sodium hydroxide solution of 65 DEG C;
S7 desmut: the Al-alloy casing after alkaline etching process being immersed in concentration is 10-60s in the nitric acid of 400mL/L, removes the black film that alkaline etching process produces;
S8 chemical polishing: the Al-alloy casing removed after black film is carried out chemical polishing 5-60s in the mixed liquor of phosphoric acid and nitric acid, wherein, in mixed liquor, the percentage by volume of phosphoric acid is 93%, the percentage by volume of nitric acid is 7%, described phosphoric acid to be mass percentage be 98% phosphoric acid, described nitric acid to be mass percentage be 68% nitric acid;
S9 anodic oxidation: be carry out anodized in the sulfuric acid solution of 200g/L in concentration by the Al-alloy casing after chemical polishing, anodised voltage is 12V, and current density is 1.2/dm
2, the time is 30-60min, forms 5-15 μm of thick oxidation film layer;
S10 dyes: the Al-alloy casing after antianode oxidation processes carries out dyeing process.
S11 sealing of hole: the Al-alloy casing after dyeing process is carried out sealing pores, obtains the Al-alloy casing in side wire drawing, non-wire drawing facing sand face.
Al-alloy casing appearance looks elegant after process.
Comparative example 1
Except not comprising except step S1, all the other are identical with embodiment 4.
Al-alloy casing after process is owing to lacking side wire drawing, and the side outward appearance of Al-alloy casing does not have metal-like, and the pattern of itself, appearance are all not good, can think defective products.
Comparative example 2
Except not comprising except step S3, all the other are identical with embodiment 4.
Al-alloy casing after process is due to the not sandblasting of non-wire-drawing surface, and the non-wire-drawing surface of the Al-alloy casing obtained does not have sand sense, without metal-like, appearance unsightly.
Comparative example 3
Except not comprising except step S9, all the other are identical with embodiment 4.
Al-alloy casing after process is not owing to doing anodic oxidation direct staining, and product cannot form micropore, and dyestuff cannot be adsorbed in micropore, therefore, cannot dye or Color very poor, the rich and varied color of outward appearance cannot present.
Comparative example 4
Except not comprising except S11, all the other are identical with embodiment 4.
Al-alloy casing after process is not owing to having sealing pores, and dyestuff easily fades, and product feel is not good, and without anti-finger printing energy, corrosion resistance is bad, and salt spray test etc. very artificial perspiration's test do not reach 48 hours.
Comparative example 5
Carry out except S1 and S2 except first carrying out step S3, all the other are identical with embodiment 4 again.
The first sandblasting of Al-alloy casing after process wire drawing again, because sandblasting face is not protected, sandblasting face of wearing and tearing during wire drawing, cause sandblasting uneven or have strip vestige, product FINAL APPEARANCE is bad.
Comparative example 7
Except step S1 is: the side wire drawing machine of Al-alloy casing is carried out wire drawing process, pulling wheel model is 10 orders, and wire drawing walking speed is 35m/min, and the rotating speed of wire drawing machine is outside 15000r/min, and all the other are identical with embodiment 4.
Al-alloy casing after process adopts 10 object pulling wheels, and go out filament diameter very thick, appearance is not good; And wire drawing walking speed can cause too soon and draws partially thus the non-wire-drawing surface that weares and teares, cause open defect, and adopt the rotating speed more than 4000r/min, wire drawing machine easily weares and teares, the easy sideslip of product, and the appearance of the Al-alloy casing therefore after process is very poor.
Comparative example 8
Except step S1 is: the side wire drawing machine of Al-alloy casing is carried out wire drawing process, the model of pulling wheel is 850 orders, and wire drawing walking speed is 1m/min, and the rotating speed of wire drawing machine is outside 2500r/min, and all the other are identical with embodiment 4.
Al-alloy casing wire drawing after process adopts 850 orders, low walking speed, and go out filament diameter too thin (being less than 0.1mm), therefore, the Al-alloy casing wire-drawing effect after process is bad, and wire drawing low walking speed production capacity is lower.
Applicant states; the foregoing is only the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; person of ordinary skill in the field should understand; anyly belong to those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all drop within protection scope of the present invention and open scope.
Claims (10)
1. a surface treatment method for Al-alloy casing, is characterized in that, described surface treatment method comprises the steps:
S1, by the side wire drawing of Al-alloy casing, obtains wire-drawing surface;
The non-wire-drawing surface of Al-alloy casing is carried out blasting treatment by S2;
Al-alloy casing after wire drawing and blasting treatment is carried out overall anodized by S3, forms oxidation film layer;
Al-alloy casing after anodized is carried out sealing pores by S4, obtains the Al-alloy casing in side wire drawing, non-wire drawing facing sand face.
2. surface treatment method according to claim 1, is characterized in that, also carries out step S31 after step S3 He before step S4: the Al-alloy casing after antianode oxidation processes carries out dyeing process;
Preferably, the coloring agent used in described dyeing process is golden coloring agent, blue dyeing agent or black dye.
3. surface treatment method according to claim 1 and 2, is characterized in that, step S1 adopts craft or wire drawing machine to carry out wire drawing to the side of Al-alloy casing;
Preferably, in described wire drawing machine, the model of pulling wheel is 20-800 order;
Preferably, the rotating speed of described wire drawing machine is 1800-2400r/min;
Preferably, described in step S1, the speed of travel of Al alloy shell body side surface described in wire drawing process is 2-30m/min;
Preferably, described in step S1, the outlet scope of wire drawing process is 0.1-2.5mm.
4. according to the surface treatment method one of claim 1-3 Suo Shu, it is characterized in that, step S2 is specially: protect with the non-wire-drawing surface of tool by Al-alloy casing, sandblast resistant durable ink is sprayed afterwards on wire-drawing surface, tool is removed, again blasting treatment is carried out to non-wire-drawing surface, after blasting treatment, sandblast resistant durable ink is divested;
Preferably, blasting treatment described in step S2 is combined as material spray with a kind of in glass sand, steel sand or zircon sand or at least two kinds;
Preferably, described sand mold is 80-220 order;
Preferably, the pressure of blasting treatment described in step S2 is 1.0-2.5kg/cm
2;
Preferably, in blasting treatment described in step S2, the speed of travel of the non-wire-drawing surface of Al-alloy casing is 8-15m/min.
5. according to the processing method one of claim 1-4 Suo Shu, it is characterized in that, after step S2 He before step S3, also carry out following steps:
Al-alloy casing after wire drawing process and blasting treatment is carried out ungrease treatment by S21;
Al-alloy casing after ungrease treatment is carried out alkaline etching by S22;
The black film that S23 produces after removing alkaline etching process;
The Al-alloy casing removed after black film is carried out chemical polishing by S24.
6. surface treatment method according to claim 5, is characterized in that, step S21 adopts the mixed liquor of tertiary sodium phosphate, NPE and dodecyl sodium sulfate to carry out ungrease treatment;
Preferably, the concentration of tertiary sodium phosphate is 50-60g/L, and the concentration of NPE is 2-8mL/L, and the concentration of dodecyl sodium sulfate is 0.5-2g/L;
Preferably, ungrease treatment described in step S21 is carried out under 50-60 DEG C of condition;
Preferably, the time of ungrease treatment described in step S21 is 3-5min.
7. the surface treatment method according to claim 5 or 6, is characterized in that, step S22 adopts sodium hydroxide solution to carry out alkaline etching process;
Preferably, the concentration of described sodium hydroxide solution is 50-60g/L;
Preferably, the temperature of alkaline etching process described in step S22 is 55-65 DEG C;
Preferably, the time of alkaline etching process described in step S22 is 5-30s.
8. according to the surface treatment method one of claim 5-7 Suo Shu, it is characterized in that, the black film after step S23 adopts salpeter solution to remove alkaline etching process;
Preferably, the concentration of described salpeter solution is 200-400mL/L;
Preferably, the time of described salpeter solution process is 10-60s.
9. according to the surface treatment method one of claim 5-8 Suo Shu, it is characterized in that, chemical polishing described in step S24 is carried out in the mixed liquor of phosphoric acid and nitric acid;
Preferably, in described mixed liquor, the percentage by volume of phosphoric acid is 93%, and the percentage by volume of nitric acid is 7%;
Preferably, described phosphoric acid to be mass percentage be 98% phosphoric acid, described nitric acid to be mass percentage be 68% nitric acid;
Preferably, the time of chemical polishing described in step S24 is 5-60s.
10. according to the surface treatment method one of claim 1-9 Suo Shu, it is characterized in that, anodized described in step S3 is carry out in 150-220g/L sulfuric acid solution in concentration;
Preferably, the voltage of anodized described in step S3 is 8-16V, and current density is 1-1.5A/dm
2;
Preferably, the time of anodized described in step S3 is 30-60min;
Preferably, the thickness of oxidation film layer described in step S3 is 5-15 μm.
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Address after: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee after: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. Address before: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee before: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. |