CN104562136A - Frosting process for aluminum profile - Google Patents
Frosting process for aluminum profile Download PDFInfo
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- CN104562136A CN104562136A CN201310496880.1A CN201310496880A CN104562136A CN 104562136 A CN104562136 A CN 104562136A CN 201310496880 A CN201310496880 A CN 201310496880A CN 104562136 A CN104562136 A CN 104562136A
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Abstract
The invention discloses a frosting process of an aluminum profile. The frosting process is characterized by comprising the following steps: (a) sand blasting treatment, wherein high-pressure gas drives glass sand or steel ball sand to impact the surface of the aluminum profile through a rotary spray gun; (b) oil removal treatment, wherein oil is removed through a chemical reaction between acid and the aluminum profile and the action of hydrogen produced during the reaction; (c) alkaline degreasing processing, wherein surface dirt is removed through a reaction between sodium hydroxide and the aluminum profile; (d) neutralization treatment, wherein the black surface dirt left on the surface of the aluminum profile after alkaline degreasing is removed in acid tank liquor, and the function of neutralizing alkaline liquor left on the surface of the aluminum profile is achieved; (e) oxidation treatment, wherein the aluminum profile serves as an anode to produce low-voltage direct currents for electrolytic oxidization; (f) hole sealing processing conducted through hydration of an oxidation film, hydrolysis of salt and the function of a formed conversion film. Defects of metallic luster and line patterns on the surface of the aluminum profile can be obviously removed, and the frosting process has a good frosting effect.
Description
Technical field
The present invention relates to aluminium shape surface processing technology field, especially relate to a kind of aluminium section bar frosting technology.
Background technology
Existing most of aluminium section bar is obtain desirable surface effect to need to use acid etching ammonium bifluoride to carry out irregular corrosion as etching reagent to aluminium material surface, to eliminate the defect such as metalluster and surface crack.Its technical process as shown in Figure 1, and the ammonium bifluoride used in acid etching all has detrimentally affect to operating environment, personnel, and if its wastewater treatment is improper more may havoc factory surrounding environment, and in ammonium bifluoride use procedure, have a large amount of fluorion discharges, very large to the harm of environment, for there being the problem that a large amount of fluorion discharges is very large to the harm of environment in ammonium bifluoride use procedure, the technique using more clean more environmental protection certainly will be needed.Certainly, also the sheet erosion technique of the aluminium section bar frosted process not adopting ammonium bifluoride is had in prior art, if China Patent Publication No. is CN101457361A, a kind of aluminum section bar surface etching scattering brightener for furniture and etching method thereof, comprise the treatment solution of two kinds of heterogeneities, treatment solution composition is 1.: ammonium chloride (NH4Cl) 12gL-1 ~ 20gL-1, ammonium bifluoride (NH4HF2) 20gL-1 ~ 30gL-1, excess water.Treatment solution composition is 2.: Sodium Fluoride (NaF) 15gL-1 ~ 20gL-1, potassium permanganate (KMnO4) 5gL-1 ~ 10gL-1, excess water.The operating process of chemical etching is as follows: (1) oil removing operation routinely removes the greasy dirt of aluminium shape surface; (2) etch process is carried out, first aluminium section bar is put into the treatment solution 1. etch 5min ~ 10min of normal temperature, taking-up flowing water puts into the treatment solution 2. etch 3min ~ 8min of normal temperature again after cleaning, taking-up flowing water is embathe 2min ~ 3min in the dilute nitric acid solution of 20% ~ 30% in mass percent after cleaning, the last oxidation of program routinely, sealing of hole, obtain finished product.Its technical process is as Fig. 1, and this processing method can make aluminium section bar obtain high-quality diffuse scattering matte surface, and low production cost.But chemically react angle to consider, because current chemicals still ubiquity to the potential threat of environment, for this reason, find a kind of different process less to environmental influence and become the urgent problem inquired in aluminum profile industry to manufacture similar aluminium shape surface treatment effect.
Summary of the invention
Object of the present invention is exactly deficiency in order to solve prior art and the one provided is simple to operate, obviously can remove the aluminium section bar frosting technology of the alternative ammonium bifluoride acid etching of aluminium shape surface metalluster and strain line defect.
The present invention adopts following technical solution to realize above-mentioned purpose: a kind of aluminium section bar frosting technology, it is characterized in that, it comprises the steps:
A, sandblasting, high pressure gas are used to drive glass sand or steel ball sand to impact aluminium shape surface by the spray gun rotated, impact the tiny pit of similar corrosive effect at aluminium shape surface by sand grains, remove aluminium shape surface metalluster and strain line defect, and different types of sand can be adopted carry out and process to obtain different sand face effects;
B, oil removal treatment, the acid deoiling mechanism of action is that acid is answered with aluminium generation chemistry and reaction produces hydrogen effect, makes the reduction of the oil film sticking power on aluminum component even become oil droplet and leaves surface, surface and oil contaminant in next step alkaline etching can be removed easily, even alkaline etching; Oil removing is complete should check section bar deoiling effect, and the Surface of profile after leaving standstill should be evenly moistening, does not break for acceptability criteria with in moisture film 28-33 second;
C, alkaline etching process, alkaline etching is that sodium hydroxide and aluminum component react, and removes surface contaminants, remove natural oxide film to obtain the process of pure alloy matrix aluminum, object is activating surface, also has removal extruding striped, slightly touches scuffing defect, obtain the effect of different light reflectant surface;
D, neutralizing treatment, neutralization is the black dust remained in remove alkaline etching in acid tank liquor after on aluminium workpiece surface, to obtain the metallic surface of light, remains the effect of alkaline reaction in now also having with aluminium workpiece surface;
E, oxide treatment, anodic oxidation is exactly the electrolytic oxidation that aluminum component is carried out as anode applying low-voltage DC, makes artificial oxidation's film that aluminium workpiece surface generates one deck densification, that have hole;
F, sealing pores, sealing of hole is the hydration by oxide film, the hydrolytic action of salt and the effect of formation conversion film, reduce the surfactivity of oxide film, improve the anti-stick dye ability of oxide film, prevent corrosive medium etch, improve solidity to corrosion, and improve the stability of coloring film, photostabilization and weathering resistance, extend the process in section bar work-ing life.
Further illustrating as such scheme, in described processing step a, use the spray gun of multiple 32-38Hz rotating speed, each spray gun uses the high pressure gas of 0.6-0.7MPa to drive 80 order-100 object glass sands or steel ball sand to impact aluminium section bar substrate surface, the sand amount of putting of each spray gun is 500-600 Grams Per Second, be positioned at below spray gun and increase 8-12% than the sand amount of putting of top spray gun, for the workpiece requiring upper planar band groove, top spray gun puts sand amount than normally reducing 20-40%.
In described processing step b process, section bar is tilted 3-10 ° and enter degreasing tank, enter timing after groove completely, hang out at any time according to production schedule in the time range of processing requirement, tilt after 5 °-10 ° standing 10-20 seconds, enter washing bath.
In described processing step c process, section bar starts timing after entering alkali groove, and the time is 30-180 second, then hang out afterwards and tilt to see its surface, condition of surface meets model requirement and enters washing, alkaline etching 30-180 second again added time when alkali cleaning is not enough, so repeatedly, until qualified.
In described processing step d, section bar is first repeatedly washed rear-inclined through twice washing bath in order and is left standstill 10-20 second, enters neutralizing well completely and starts timing, then hang out, and it is no to observe surface clean, not totally can in processing range the added time put into, qualifiedly hang out washing;
In described processing step e, section bar enters oxidation trough, after electrical contact is good, controls adjustment electric current and time energising oxidation, then hangs out washing, survey oxide thickness, qualifiedly proceeds to next procedure, added time oxidation that thickness is not enough.
In described processing step f sealing pores, section bar opens timing register after entering sealing of hole groove, and the time arrives, and slings inclination 23-35 second, and after work checks that sealing quality is qualified, can wash and hang lower row place, sealing of hole is defective can added time sealing of hole.
The beneficial effect that the present invention adopts above-mentioned technical solution to reach is:
The present invention adopts and drives glass sand to impact aluminium shape surface with high pressure gas, enough thin and when possessing enough speed at glass sand, can impact at aluminium shape surface the tiny pit of similar corrosive effect, obviously can remove aluminium shape surface metalluster and strain line defect, and can for the surface requirements of different aluminum section bar, different types of sand can be adopted carry out and process to obtain different sand face effects.
Accompanying drawing explanation
Fig. 1 is existing aluminium section bar frosting technology schema;
Fig. 2 is aluminium section bar frosting technology schema of the present invention.
Embodiment
As shown in Figure 2, the present invention is a kind of aluminium section bar frosting technology, and its processing step is as follows:
A, sandblasting: use the high pressure gas of 0.6-0.7MPa to drive 80-100 object glass sand/steel ball sand, correctly to select the specification of sand, normal speed and put sand amount prerequisite under, as too small in found the roughness in sandblasting face, can not solve by the method improving spray gun rotating speed, and the larger sand of granularity should be changed, to increase blow energy to reach sandblasting specification of quality; Aluminium section bar substrate surface is impacted by multiple spray guns of 32-38Hz rotating speed, the sand amount of putting of each spray gun is about 500-600 Grams Per Second, above below spray gun ratio, spray gun increases about 10%, for the workpiece of upper planar band groove, top spray gun puts sand amount than normally reducing 20-40%, in order to avoid groove inner product sand too much affects sandblasting quality;
B, oil removal treatment: section bar tilts 5 ° and enters degreasing tank, enter timing after groove completely, hung out at any time in 3-5 minute according to production schedule, tilts after 5 °-10 ° standing 10-20 seconds, enter washing bath;
C, alkaline etching process: oil removing washing leaves standstill and enters alkali groove after 20 seconds, and start timing after putting in place, the time is 30-180 second, bell rings then, hang out and tilt to see its surface, condition of surface meets model requirement and enters washing, alkaline etching 30-180 second again added time when alkali cleaning is not enough, so repeatedly, until qualified;
D, neutralizing treatment: repeatedly wash rear-inclined through two road washing baths in order after alkaline etching and leave standstill 10-20 second, enter neutralizing well completely and start timing, then hang out, it is no to observe surface clean, not totally can in processing range the added time put into, qualifiedly hang out washing;
E, oxide treatment: in and after washing hang out close-up, enter oxidation trough, after electrical contact is good, control adjustment electric current and time energising oxidation, then, electric bell rings that pilot lamp is bright hangs out washing, surveys oxide thickness, qualifiedly proceeds to next procedure, added time oxidation that thickness is not enough;
F, sealing pores: section bar opens timing register after entering sealing of hole groove, the time, inclination 30 seconds of slinging, after work checks that sealing quality is qualified, can wash and hang lower row place, sealing of hole is defective can added time sealing of hole to bell rings.
Below in conjunction with specific embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1
The anodic oxidation section bar of fine uniform is required for surperficial sand face, 100 order glass sands are used to carry out sandblasting, keep high pressure gas to be pressed in the lower limit region close to 0.6MPa during sandblasting and ensure that spray gun rotates with 36-38Hz rotating speed, single spray gun is put sand amount and is about 500-550 Grams Per Second; After sandblasting, also will in nitric acid-sulfuric acid (1:2) mixed solution neutralizing treatment 2-5 minute of sodium hydroxide solution alkaline etching process 2-5 minute of AC degreaser oil removal treatment 3-5 minute of 18-25g/L, 40-70g/L, 160-200g/L, sulphuric acid soln oxide treatment 20-40 minute (corresponding thickness of oxidation film at 10-20 μm) of 160-180g/L and the nickel ion of 0.8-1.3g/L warm sealing pores 10-20 minute (each μm thickness process 1 minute) five operations, these five operations are consistent with described processing step b-step f.
Embodiment 2
Second-rate for substrate surface, need to use sand face effect to cover the situation of substrate imperfection, adjustment use 80 order glass sand carries out sandblasting, keep high pressure gas to be pressed in the upper limit region close to 0.7MPa during sandblasting and ensure that spray gun rotates with 32-34Hz rotating speed, single spray gun is put sand amount and is about 580-600 Grams Per Second; After sandblasting, also will in the sodium hydroxide solution alkaline etching process of AC degreaser oil removal treatment 3-5 minute of 18-25g/L, 40-70g/L (requiring to determine the alkaline etching time according to surface effect), nitric acid-sulfuric acid (1:2) mixed solution neutralizing treatment 2-5 minute of 160-200g/L, the sulphuric acid soln oxide treatment of 160-180g/L and the nickel ion of 0.8-1.3g/L warm sealing pores (requiring to determine oxidation and sealing of hole time according to thickness) five operations, these five operations are consistent with described processing step b-step f.
The present invention is directed in ammonium bifluoride use procedure the problem having a large amount of fluorion discharges very large to the harm of environment, chemically react angle to consider, because research center of gravity, to the potential threat of environment, therefore is transferred to physical treatment aspect by current chemicals still ubiquity.And in order to eliminate aluminium shape surface metalluster and strain line defect, generally having polishing and covering two kinds of directions.But because aluminium section bar needs to carry out anodic oxidation, therefore can not material covering be carried out.On all directions that can only be placed on polishing removal, traditional grinding process can take time and effort, especially the irregular aluminium section bar of section has almost been difficult to.And novel process of the present invention drives glass sand to impact aluminium shape surface with high pressure gas, enough thin and when possessing enough speed at glass sand, the tiny pit of similar corrosive effect be can impact at aluminium shape surface, aluminium shape surface metalluster and strain line defect obviously can be removed.
Above-described is only the preferred embodiment of the present invention, it should be pointed out that for the person of ordinary skill of the art, and without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (2)
1. an aluminium section bar frosting technology, is characterized in that, it comprises the steps:
A, sandblasting, use high pressure gas to drive glass sand or steel ball sand to impact aluminium shape surface by the spray gun rotated, impact tiny pit, remove aluminium shape surface metalluster and strain line defect by sand grains at aluminium shape surface;
B, oil removal treatment, utilize acid with aluminium section bar occur chemistry should and reaction produce hydrogen effect, the oil film sticking power on aluminium section bar is reduced, becomes oil droplet and leave surface; Oil removing is complete should check section bar deoiling effect, and the Surface of profile after leaving standstill should be evenly moistening, does not break for acceptability criteria with in moisture film 28-33 second;
C, alkaline etching process, utilize sodium hydroxide and aluminium section bar to react, and removes surface contaminants, remove natural oxide film to obtain the process of pure alloy matrix aluminum;
D, neutralizing treatment, by the black dust remained in after the aluminium section bar of alkaline etching process removes alkaline etching in acid tank liquor on aluminium workpiece surface, in and aluminium shape surface remain the effect of alkaline reaction;
E, oxide treatment, using the electrolytic oxidation that aluminium section bar carries out as anode applying low-voltage DC, make artificial oxidation's film that aluminium shape surface generates one deck densification, that have hole;
F, sealing pores, sealing of hole is the hydration by oxide film, the hydrolytic action of salt and the effect of formation conversion film.
2. a kind of aluminium section bar frosting technology according to claim 1, it is characterized in that, in described processing step a, use the spray gun of multiple 32-38Hz rotating speed, each spray gun uses the high pressure gas of 0.6-0.7MPa to drive 80 order-100 object glass sands or steel ball sand to impact aluminium section bar substrate surface, the sand amount of putting of each spray gun is 500-600 Grams Per Second, be positioned at below spray gun and increase 8-12% than the sand amount of putting of top spray gun, for the workpiece requiring upper planar band groove, top spray gun puts sand amount than normally reducing 20-40%.
In described processing step b process, section bar is tilted 3-10 ° and enter degreasing tank, enter timing after groove completely, hang out at any time according to production schedule in the time range of processing requirement, tilt after 5 °-10 ° standing 10-20 seconds, enter washing bath.
In described processing step c process, section bar starts timing after entering alkali groove, and the time is 30-180 second, then hang out afterwards and tilt to see its surface, condition of surface meets model requirement and enters washing, alkaline etching 30-180 second again added time when alkali cleaning is not enough, so repeatedly, until qualified.
In described processing step d, section bar is first repeatedly washed rear-inclined through twice washing bath in order and is left standstill 10-20 second, enters neutralizing well completely and starts timing, then hang out, and it is no to observe surface clean, not totally can in processing range the added time put into, qualifiedly hang out washing;
In described processing step e, section bar enters oxidation trough, after electrical contact is good, controls adjustment electric current and time energising oxidation, then hangs out washing, survey oxide thickness, qualifiedly proceeds to next procedure, added time oxidation that thickness is not enough.
In described processing step f sealing pores, section bar opens timing register after entering sealing of hole groove, and the time arrives, and slings inclination 23-35 second, and after work checks that sealing quality is qualified, can wash and hang lower row place, sealing of hole is defective can added time sealing of hole.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104878390A (en) * | 2015-05-28 | 2015-09-02 | 湖州巨力铝型材有限公司 | Rapid and efficient sanding process for aluminium profile |
| CN105154953A (en) * | 2015-09-25 | 2015-12-16 | 广东欧珀移动通信有限公司 | Method for processing surface of metal battery cover of mobile phone |
| CN105543933A (en) * | 2015-12-17 | 2016-05-04 | 广东欧珀移动通信有限公司 | 3D effect surface treatment process |
| CN105908203A (en) * | 2016-05-31 | 2016-08-31 | 刘洪建 | Surface treatment process for aluminum alloy |
| CN106757269A (en) * | 2016-11-17 | 2017-05-31 | 广东坚美铝型材厂（集团）有限公司 | Aluminium section bar oxide-film method for demoulding and aluminium section bar oxide-film film plating process |
| CN107893251A (en) * | 2017-12-05 | 2018-04-10 | 湖南航天磁电有限责任公司 | A kind of pre-treating method of 7 line aluminium alloy anodic oxidation |
| CN108070896A (en) * | 2018-01-17 | 2018-05-25 | 南京海创表面处理技术有限公司 | Cast magnesium alloy product surface processing equipment and its technique |
| CN109321920A (en) * | 2018-11-27 | 2019-02-12 | 上海申和热磁电子有限公司 | A kind of strip method aoxidizing plate |
| CN109652836A (en) * | 2019-02-26 | 2019-04-19 | 国际铝业(厦门)有限公司 | A kind of process of surface treatment of 6063 aluminium alloy extrusions |
| CN110079848A (en) * | 2019-04-28 | 2019-08-02 | 安徽华淮新材料有限公司 | Aluminum alloy chemically coarse sand surface treatment method |
| CN111455426A (en) * | 2020-06-02 | 2020-07-28 | 惠州高康达实业有限公司 | Aluminum material surface treatment process |
| CN112941523A (en) * | 2021-01-26 | 2021-06-11 | 广东华昌铝厂有限公司 | Frosting process for aluminum profile production |
| CN114399948A (en) * | 2021-12-02 | 2022-04-26 | 河北汉光重工有限责任公司 | Preparation method of aluminum white frosted bottom label |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878390A (en) * | 2015-05-28 | 2015-09-02 | 湖州巨力铝型材有限公司 | Rapid and efficient sanding process for aluminium profile |
| CN105154953A (en) * | 2015-09-25 | 2015-12-16 | 广东欧珀移动通信有限公司 | Method for processing surface of metal battery cover of mobile phone |
| CN105543933A (en) * | 2015-12-17 | 2016-05-04 | 广东欧珀移动通信有限公司 | 3D effect surface treatment process |
| CN105908203A (en) * | 2016-05-31 | 2016-08-31 | 刘洪建 | Surface treatment process for aluminum alloy |
| CN106757269A (en) * | 2016-11-17 | 2017-05-31 | 广东坚美铝型材厂（集团）有限公司 | Aluminium section bar oxide-film method for demoulding and aluminium section bar oxide-film film plating process |
| CN107893251A (en) * | 2017-12-05 | 2018-04-10 | 湖南航天磁电有限责任公司 | A kind of pre-treating method of 7 line aluminium alloy anodic oxidation |
| CN108070896A (en) * | 2018-01-17 | 2018-05-25 | 南京海创表面处理技术有限公司 | Cast magnesium alloy product surface processing equipment and its technique |
| CN109321920A (en) * | 2018-11-27 | 2019-02-12 | 上海申和热磁电子有限公司 | A kind of strip method aoxidizing plate |
| CN109652836A (en) * | 2019-02-26 | 2019-04-19 | 国际铝业(厦门)有限公司 | A kind of process of surface treatment of 6063 aluminium alloy extrusions |
| CN110079848A (en) * | 2019-04-28 | 2019-08-02 | 安徽华淮新材料有限公司 | Aluminum alloy chemically coarse sand surface treatment method |
| CN111455426A (en) * | 2020-06-02 | 2020-07-28 | 惠州高康达实业有限公司 | Aluminum material surface treatment process |
| CN112941523A (en) * | 2021-01-26 | 2021-06-11 | 广东华昌铝厂有限公司 | Frosting process for aluminum profile production |
| CN114399948A (en) * | 2021-12-02 | 2022-04-26 | 河北汉光重工有限责任公司 | Preparation method of aluminum white frosted bottom label |
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