CN1920110A - Anodic oxidation technology for inner and outer wall of aluminium tube - Google Patents
Anodic oxidation technology for inner and outer wall of aluminium tube Download PDFInfo
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- CN1920110A CN1920110A CN 200610036687 CN200610036687A CN1920110A CN 1920110 A CN1920110 A CN 1920110A CN 200610036687 CN200610036687 CN 200610036687 CN 200610036687 A CN200610036687 A CN 200610036687A CN 1920110 A CN1920110 A CN 1920110A
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Abstract
The invention discloses anodic oxidation technology used for aluminum pipe wall. The technology uses electrolytic solution with special addition agent. The invention is easy to operate, and the inner and outer surfaces of aluminum pipe get the oxidation film. The technology improves the heat dissipation and conductivity capacity, improves the erosion-resisting characteristics and abradability of inner surface, extending the usage, and extending the life.
Description
Technical field
The present invention relates to the aluminium shape surface process field, particularly a kind of tubing anodic oxidation technology for inner and outer wall.
Background technology
Existing is in the aluminum pipe anode oxidation process of electrolytic solution with sulfuric acid, can only carry out the outside surface anodic oxidation, along with the expansion day by day of pipe applications scope, needs the internal surface of aluminum pipe is also carried out anodic oxidation in some Application Areas.But because a large amount of heat is emitted in oxidation in the pipe, the rete that makes this position easily is overheated and dissolve, and internal surface causes that very easily efflorescence burns phenomenon, is to be difficult to the problem that breaks through in the process of surface treatment for the pipe internal surface oxide treatment therefore always.
Summary of the invention
For addressing the above problem, the purpose of this invention is to provide a kind of anodic oxidation technology for inner and outer wall of aluminium tube, it both can carry out the outside surface anodic oxidation, can carry out the internal surface anodic oxidation again.
The object of the present invention is achieved like this: a kind of anodic oxidation technology for inner and outer wall of aluminium tube is characterized in that: the electrolytic solution that described anodic oxidation is adopted contains: sulfuric acid 160-180 grams per liter, aluminum ion 5-15 grams per liter, all plate agent 2-4%, oxalic acid 2-5 grams per liter; Described anodised processing condition are: 18-21 ℃ of anodic oxidation temperature, and time 30-60 minute, anodic current density 1.2-1.6 ampere/square decimeter, cathode area is 1 with the annode area ratio: 1-2; In the described anode oxidation process, run through being provided with the supplementary unit that can promote to manage interior formation oxidation loop and prevent to manage internal short-circuit in the aluminum pipe.
Described aluminum pipe is hung with inclination 15-20 degree angle dress in oxidising process.
Described supplementary unit is the auxiliary cathode in the anodic oxidation equipment, this anodic oxidation equipment comprises anodizing tank, negative plate, hanger, negative electrode beam, wherein hanger comprises auxiliary cathode hanging column and the anode hanging column that hangs on side by side on the anode conducting beam, pending aluminum pipe is fixed on the anode hanging column, and auxiliary cathode runs through pending aluminum pipe and is fixed on the auxiliary cathode hanging column.
Described auxiliary cathode is with the aluminium bar of insulating plastics circle for the surface.
Described auxiliary cathode hanging column is connected with the negative electrode beam of oxidation trough by the negative electrode wire.
Technology of the present invention is grasped easily, utility appliance is easy to make, as long as on original common anode oxidizing process, give suitable improvement, can use the present invention produces, has significant superiority, the surfaces externally and internally that not only makes aluminum pipe all obtains good oxide film, and more effectively improve the heat radiation and the conductive capability of tank liquor, through a large amount of experiments and application proof, adopt the present invention to aluminum pipe (internal diameter 50-400mm, length 2000-5000mm, thickness 1-5mm) carry out anodic oxidation, surfaces externally and internally all can obtain uniform rete, improve the etch resistant properties and the wear resisting property of internal surface, than prior art tangible progress is arranged, the present invention has enlarged the range of application of aluminum pipe, has prolonged its work-ing life.
Description of drawings
Fig. 1 is a process flow diagram of the present invention;
Fig. 2 is a working circuit diagram of the present invention;
Fig. 3 is that dress of the present invention is hung synoptic diagram;
Fig. 4 A, 4B are respectively two kinds of structural representations of insulating plastics circle of the present invention;
Fig. 5 is the scheme of installation of aluminum pipe of the present invention and auxiliary cathode;
Fig. 6 is the structural representation of hanger of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment.
As shown in Figure 1, the present invention is a kind of anodic oxidation technology for inner and outer wall of aluminium tube, comprises operations such as acid deoiling, alkaline corrosion, bright dipping, anodic oxidation and sealing.
Wherein, operations such as acid deoiling, alkaline corrosion, bright dipping, sealing routinely technology handle.
In the anodic oxidation operation, electrolytic solution contains: sulfuric acid 160-180 grams per liter, aluminum ion 5-15 grams per liter, all plate agent 2-4%, oxalic acid 2-5 grams per liter.All plate heat radiation and conductive capability that agent can improve tank liquor, have cooling, the froth breaking strengthened in the aluminum pipe, impel effects such as even film layer, the EE additive that preferred Guangzhou Bai'an U.S. chemical company produces.
Described anodised processing condition are: 18-21 ℃ of anodic oxidation temperature, and time 30-60 minute, anodic current density 1.2-1.6 ampere/square decimeter, cathode area is 1 with the annode area ratio: 1-2; In the described anode oxidation process, run through being provided with the supplementary unit that can promote to manage interior formation oxidation loop and prevent to manage internal short-circuit in the aluminum pipe.
In the present embodiment, this supplementary unit is the auxiliary cathode 4 in the anodic oxidation equipment.This anodic oxidation equipment comprises anodizing tank 1, negative plate 2, special-purpose auxiliary hanger, negative electrode beam etc.As shown in Figure 3, wherein hanger comprises auxiliary cathode hanging column 8 and the anode hanging column 7 that hangs on side by side on the anode conducting beam 5, auxiliary cathode hanging column 8 is located at anode hanging column 7 outsides, anode hanging column 7 is fixing with aluminum pipe 3 by anchor clamps 9, auxiliary cathode hanging column 8 is fixing with auxiliary cathode 4 by anchor clamps 9, this auxiliary cathode 4 runs through pending aluminum pipe 3, and its special-purpose auxiliary cathode hanging column 8 can fix and make auxiliary cathode 4 conductions good easily.As shown in Figure 5, auxiliary cathode 4 is the blocky solid aluminum plug in the side of being, two ends of Φ 10-50mm, and its surface is by uniformly-spaced being socketed with two or more insulating plastics circles 10, contacts with aluminum pipe 3 inwalls and is short-circuited to prevent auxiliary cathode 4.Shown in Fig. 4 A, 4B, insulating plastics circle 10 is a gear-like, so that oxidation liquid is between cog unrestricted flow, endoporus is shaped as circular or square etc. not to be limit, cooperate the shape of cross section of auxiliary cathode 4 and decide, internal orifice dimension is that 10-50mm, external diameter are that 20-60mm, wall thickness are 2-4mm, laterally hem width is 5mm, the long 5-10mm of tooth.Auxiliary cathode hanging column 8 is connected with the negative electrode beam of oxidation trough 1 by negative electrode wire 6, and negative electrode wire 6 band standing bolts are the negative electrode conductive carriers that are connected between auxiliary cathode hanging column 8 and the negative plate 2.As shown in Figure 6, anode hanging column 7 is the aluminium bar of an end strap bolt; Auxiliary cathode hanging column 8 is the solid aluminium bar of band hook 81, and it hangs on the anode conducting beam 5 fixing by PVC insulation hook 81, and makes between both point of contact and insulating.
Operation steps: auxiliary cathode 4 is penetrated in the pending aluminum pipe 3, aluminum pipe 3 is fixed on the anode hanging column 7 with anchor clamps 9 with inclination 15-20 degree angle, auxiliary cathode hanging column 8 hangs on the anode conducting beam 5 simultaneously, auxiliary cathode 4 usefulness anchor clamps 9 are fixed on the auxiliary cathode hanging column 8, negative electrode wire 6 one ends are fixed on the auxiliary cathode hanging column 8.After pre-treatment, anode conducting beam 5 descended puts into oxidation trough 1, the other end of negative electrode wire 6 is fixed on the negative electrode beam connects, this moment circuit as shown in Figure 2.Open the oxidation machine, oxidation area according to pipe fitting is regulated electric current, under the effect of electric current, constantly generate oxide film on aluminum pipe 3 tube walls, inside pipe wall and auxiliary cathode 4 precipitated oxygen and hydrogen under the effect of electric current makes and produces negative pressure in the pipe simultaneously, promotes oxidation liquid generation convection current in the pipe, bring in constant renewal in tank liquor, under the effect of all plating agent and oxalic acid, make that temperature and the voltage in the pipe maintains in certain span of control simultaneously, thereby make the inside and outside oxide film of pipe obtain same ideal oxidation effectiveness.
Embodiment 1
At first, aluminum pipe is carried out acid deoiling, alkaline corrosion, bright dipping, technology is handled routinely.
Carry out anodic oxidation then.The electrolyte prescription that is adopted: sulfuric acid 172 grams per liters, aluminum ion 9 grams per liters, EE additive 3.5%, oxalic acid 3 grams per liters, 18 ℃ of electrolyte temperatures.In the inner and outer wall of aluminium tube anodic oxidation equipment, cathode area is 1 with the annode area ratio: 1-2, the aluminium bar of the long 2200mm one headband bolt of anode hanging column 7 usefulness Φ 80mm, auxiliary cathode 4 is a Φ 10-50mm solid aluminum plug, gear-like insulating plastics circle 10 internal diameters are that 10-50mm, external diameter are that 20-60mm, wall thickness are 2-4mm, laterally hem width is 5mm, the long 5-10mm of tooth.Auxiliary cathode hanging column 8 is headband hook 81 and the aluminium bar that is welded with square bolt.When aluminum pipe 3 need carry out the internal and external anode oxidation, auxiliary cathode 4 is inserted in the aluminum pipe 3, then aluminum pipe 3 is fixed on the anode hanging column 7 with anchor clamps 9 with inclination 15-20 degree angle, auxiliary cathode hanging column 8 hangs on the anode conducting beam 5, simultaneously auxiliary cathode 4 solid aluminum plugs are fixed on the auxiliary cathode hanging column 8 with anchor clamps 9, negative electrode wire 6 one ends are fixed on the auxiliary cathode hanging column 8, then anode conducting beam 5 is descended and put into oxidation trough 1, the other end of negative electrode wire 6 is fixed on the negative electrode beam and connects, and circuit as shown in Figure 2 at this moment.Open the oxidation machine, 1.4 amperes/square decimeter of anodic current densities, in 45 minutes treatment times, the inside and outside surface of aluminum pipe can obtain uniform rete.
Take common process to seal at last.
The electrolyte prescription that anodic oxidation is adopted: sulfuric acid 176 grams per liters, aluminum ion 7 grams per liters, EE additive 3.2%, oxalic acid 3.6 grams per liters.21 ℃ of electrolyte temperatures.1.3 amperes/square decimeter of anodic current densities, 50 minutes treatment times.
All the other are with embodiment 1.
The electrolyte prescription that anodic oxidation is adopted: sulfuric acid 160 grams per liters, aluminum ion 5 grams per liters, EE additive 2%, oxalic acid 5 grams per liters.21 ℃ of electrolyte temperatures.1.6 amperes/square decimeter of anodic current densities, 30 minutes treatment times.
All the other are with embodiment 1.
The electrolyte prescription that anodic oxidation is adopted: sulfuric acid 180 grams per liters, aluminum ion 15 grams per liters, EE additive 4%, oxalic acid 2 grams per liters.18 ℃ of electrolyte temperatures.1.2 amperes/square decimeter of anodic current densities, 60 minutes treatment times.
All the other are with embodiment 1.
Claims (10)
1, a kind of anodic oxidation technology for inner and outer wall of aluminium tube is characterized in that:
---the electrolytic solution that described anodic oxidation is adopted contains: sulfuric acid 160-180 grams per liter, aluminum ion 5-15 grams per liter, all plate agent 2-4%, oxalic acid 2-5 grams per liter;
---described anodised processing condition are: 18-21 ℃ of anodic oxidation temperature, and time 30-60 minute, anodic current density 1.2-1.6 ampere/square decimeter, cathode area is 1 with the annode area ratio: 1-2;
---in the described anode oxidation process, run through being provided with the supplementary unit that can promote to manage interior formation oxidation loop and prevent to manage internal short-circuit in the aluminum pipe.
2, a kind of anodic oxidation technology for inner and outer wall of aluminium tube according to claim 1 is characterized in that:
Described aluminum pipe is hung with inclination 15-20 degree angle dress in oxidising process.
3, a kind of anodic oxidation technology for inner and outer wall of aluminium tube according to claim 1 is characterized in that:
Described supplementary unit is the auxiliary cathode in the anodic oxidation equipment, this anodic oxidation equipment comprises anodizing tank, negative plate, hanger, negative electrode beam, wherein hanger comprises auxiliary cathode hanging column and the anode hanging column that hangs on side by side on the anode conducting beam, pending aluminum pipe is fixed on the anode hanging column, and auxiliary cathode runs through pending aluminum pipe and is fixed on the auxiliary cathode hanging column.
4, a kind of anodic oxidation technology for inner and outer wall of aluminium tube according to claim 3 is characterized in that:
Described auxiliary cathode is with the aluminium bar of insulating plastics circle for the surface.
5, a kind of anodic oxidation technology for inner and outer wall of aluminium tube according to claim 4 is characterized in that:
Described insulating plastics circle is a gear-like.
6, a kind of anodic oxidation technology for inner and outer wall of aluminium tube according to claim 5 is characterized in that:
Described gear-like insulating plastics circle internal diameter is that 10-50mm, external diameter are 20-60mm, the long 5-10mm of tooth.
7, a kind of anodic oxidation technology for inner and outer wall of aluminium tube according to claim 4 is characterized in that:
Described insulating plastics circle comprises two or more, is socketed on the auxiliary cathode surface equally spacedly.
8, a kind of anodic oxidation technology for inner and outer wall of aluminium tube according to claim 3 is characterized in that:
Described auxiliary cathode is the solid aluminum plug of diameter 10-50mm.
9, a kind of anodic oxidation technology for inner and outer wall of aluminium tube according to claim 3 is characterized in that: the auxiliary cathode hanging column is connected with the negative electrode beam of oxidation trough by the negative electrode wire.
10, a kind of anodic oxidation technology for inner and outer wall of aluminium tube according to claim 3 is characterized in that:
Described auxiliary cathode hanging column hangs on the anode conducting beam fixing by insulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200610036687 CN1920110A (en) | 2006-07-26 | 2006-07-26 | Anodic oxidation technology for inner and outer wall of aluminium tube |
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| CN 200610036687 CN1920110A (en) | 2006-07-26 | 2006-07-26 | Anodic oxidation technology for inner and outer wall of aluminium tube |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104021971A (en) * | 2014-05-16 | 2014-09-03 | 昆山佑翔电子科技有限公司 | Short circuit prevention power source switch |
| CN105063712A (en) * | 2015-08-05 | 2015-11-18 | 山东核电设备制造有限公司 | Fast oxidation and electrolytic coloring device for nuclear power plant flow guiding device |
| CN105543930A (en) * | 2015-12-22 | 2016-05-04 | 安徽华东光电技术研究所 | Aluminum insulating bush and preparation method thereof |
| CN106319600A (en) * | 2015-06-27 | 2017-01-11 | 重庆大学 | Preparation method for titanium dioxide nanotube array of inner surface of ultra-long fine titanium tube |
| CN106835229A (en) * | 2017-02-14 | 2017-06-13 | 哈尔滨东安发动机（集团）有限公司 | A kind of tube kind part hard anodized method long |
| CN110184637A (en) * | 2019-07-10 | 2019-08-30 | 文晓斌 | Improve the ceramic layer and preparation method of Venturi tube inner wall antifriction corrosion resistance |
| CN112921378A (en) * | 2021-01-21 | 2021-06-08 | 广州市晨创玻璃发展有限公司 | Aluminum alloy surface oxidation treatment method and aluminum alloy ceramic water pipe |
| CN114438567A (en) * | 2022-01-23 | 2022-05-06 | 山东华建铝业集团有限公司 | Anodic oxidation and electrophoretic coating method in aluminum alloy section cavity |
| CN114481253A (en) * | 2021-12-20 | 2022-05-13 | 河南平高电气股份有限公司 | Method for improving in-hole anodic oxidation deep plating capacity of porous part |
| CN115305546A (en) * | 2022-08-31 | 2022-11-08 | 佛山力邦通信设备科技有限公司 | Internal and external different oxidation process for aluminum alloy special-shaped cavity |
-
2006
- 2006-07-26 CN CN 200610036687 patent/CN1920110A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104021971A (en) * | 2014-05-16 | 2014-09-03 | 昆山佑翔电子科技有限公司 | Short circuit prevention power source switch |
| CN106319600A (en) * | 2015-06-27 | 2017-01-11 | 重庆大学 | Preparation method for titanium dioxide nanotube array of inner surface of ultra-long fine titanium tube |
| CN105063712A (en) * | 2015-08-05 | 2015-11-18 | 山东核电设备制造有限公司 | Fast oxidation and electrolytic coloring device for nuclear power plant flow guiding device |
| CN105543930A (en) * | 2015-12-22 | 2016-05-04 | 安徽华东光电技术研究所 | Aluminum insulating bush and preparation method thereof |
| CN106835229A (en) * | 2017-02-14 | 2017-06-13 | 哈尔滨东安发动机（集团）有限公司 | A kind of tube kind part hard anodized method long |
| CN110184637A (en) * | 2019-07-10 | 2019-08-30 | 文晓斌 | Improve the ceramic layer and preparation method of Venturi tube inner wall antifriction corrosion resistance |
| CN110184637B (en) * | 2019-07-10 | 2020-10-09 | 文晓斌 | Ceramic layer for improving friction-reducing and corrosion-resisting performances of inner wall of Venturi tube and preparation method thereof |
| CN112921378A (en) * | 2021-01-21 | 2021-06-08 | 广州市晨创玻璃发展有限公司 | Aluminum alloy surface oxidation treatment method and aluminum alloy ceramic water pipe |
| CN114481253A (en) * | 2021-12-20 | 2022-05-13 | 河南平高电气股份有限公司 | Method for improving in-hole anodic oxidation deep plating capacity of porous part |
| CN114481253B (en) * | 2021-12-20 | 2024-03-29 | 河南平高电气股份有限公司 | Method for improving anodic oxidation deep plating capacity in holes of porous parts |
| CN114438567A (en) * | 2022-01-23 | 2022-05-06 | 山东华建铝业集团有限公司 | Anodic oxidation and electrophoretic coating method in aluminum alloy section cavity |
| CN115305546A (en) * | 2022-08-31 | 2022-11-08 | 佛山力邦通信设备科技有限公司 | Internal and external different oxidation process for aluminum alloy special-shaped cavity |
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Open date: 20070228 |