CN112921378A - Aluminum alloy surface oxidation treatment method and aluminum alloy ceramic water pipe - Google Patents
Aluminum alloy surface oxidation treatment method and aluminum alloy ceramic water pipe Download PDFInfo
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- CN112921378A CN112921378A CN202110082487.2A CN202110082487A CN112921378A CN 112921378 A CN112921378 A CN 112921378A CN 202110082487 A CN202110082487 A CN 202110082487A CN 112921378 A CN112921378 A CN 112921378A
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- aluminum alloy
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- surface oxidation
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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
- C25D11/024—Anodisation under pulsed or modulated current or potential
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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
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
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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
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/10—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids
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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
- C25D11/16—Pretreatment, e.g. desmutting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/08—Coatings characterised by the materials used by metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Laminated Bodies (AREA)
Abstract
The application belongs to the technical field of aluminum alloy surface treatment. The application provides an aluminum alloy surface oxidation treatment method and an aluminum alloy ceramic water pipe. The surface oxidation treatment method can form a compact and uniform ceramic layer on the surface of the aluminum alloy, and the ceramic layer has the advantages of high hardness, strong wear resistance, high breakdown voltage resistance, low porosity, strong adhesive force and large thickness, and can not crack and age after being used for a long time; corrosion resistance, high temperature resistance, stable chemical property and good biological safety. The surface oxidation treatment method has strong plasticity for the surface treatment of the aluminum alloy pipe. The aluminum alloy ceramic water pipe has good sealing performance and chemical stability due to the aluminum oxide film layer on the inner wall, has excellent biological safety performance, can reach the food sanitation level, can be widely applied to water supply and drainage pipelines, gas pipelines, thermal pipelines or chemical containers, and can also be applied to fireproof building materials.
Description
Technical Field
The application belongs to the technical field of aluminum alloy surface treatment, and particularly relates to an aluminum alloy surface oxidation treatment method and an aluminum alloy ceramic water pipe.
Background
At present, common water supply and drainage pipes are divided into galvanized water pipes, plastic water pipes and stainless steel water pipes. The galvanized water pipe has the advantages of high strength and low manufacturing cost, but is easy to rust and pollute water quality in the long-term use process, and cannot meet the use requirement of drinking water, and the more serious problem is that the water pipe is easy to rust, so that the water pipe leaks water, underground collapse in different degrees is caused, and great harm is caused to the society. The low price of plastics water pipe (including PPR water pipe, PVC water pipe etc.), the installation is simple, but the temperature range that this type of water pipe bore is extremely limited, can appear the embrittlement when the high temperature or hang down excessively, has increased the maintenance degree of difficulty, and the pipeline inner wall easily breeds the bacterium simultaneously, and long-term use can produce adverse effect to human health. The stainless steel water pipe has the characteristics of corrosion resistance and high temperature resistance, but spare and accessory parts of the stainless steel water pipe usually need to be welded, the water leakage problem is easy to occur after long-term use, the construction difficulty is high, and the manufacturing cost is too high to be accepted by the society.
Disclosure of Invention
In view of the above, the application provides an aluminum alloy surface oxidation treatment method and an aluminum alloy ceramic water pipe, so as to obtain a universal water supply and drainage pipe with stable mechanical properties and high biological safety.
The specific technical scheme of the application is as follows:
the application provides an aluminum alloy surface oxidation treatment method, which comprises the steps of placing an aluminum alloy material in electrolyte, and carrying out anodic oxidation treatment under the condition that the voltage gradually rises.
In the present application, a dense and uniform ceramic layer (Al) can be formed on the surface of the aluminum alloy2O3) The ceramic layer has high hardness, strong wear resistance, high breakdown voltage resistance, low porosity, strong adhesive force and large thickness, and can not crack and age after long-term use; corrosion resistance, high temperature resistance, stable chemical property and good biological safety. Combining the strong bending resistance and tensile resistance of the aluminum alloy material, the aluminum alloy material after surface treatment can be widely applied to water supply and drainage pipelines, gas pipelines, heating pipelines or chemical capacityThe device can also be applied to fireproof building materials.
Preferably, the temperature of the anodic oxidation is-10 to 5 ℃.
Preferably, the anodic oxidation electrolyte is selected from one or more of sulfuric acid, oxalic acid and chromic acid;
the concentration of the electrolyte is 200-350 g/L. More preferably, the electrolyte is sulfuric acid.
Preferably, the voltage of the anodic oxidation is 15-100V, and the current density is 0.5-5A/dm2. More preferably, the anodic oxidation voltage is 25-100V, and the current density is 2-5A/dm2。
Preferably, the initial voltage of the anodic oxidation is 15-20V, and the initial current density is 0.5A/dm2The voltage increase rate is 3-5V/min, and the anodic oxidation time is 50 min.
Preferably, the interval time of the pressure increase in the anodic oxidation is 5-10 min.
Preferably, the anodic oxidation further comprises:
sequentially carrying out degreasing, water washing, alkaline etching, neutralization brightening and water washing on the aluminum alloy material;
the treatment liquid for neutralizing and brightening is hydrochloric acid;
the mass concentration of the hydrochloric acid is 10-25%.
Preferably, the degreasing treatment liquid is selected from an organic solvent, a surfactant, an alkali solution or an acid solution;
the treatment solution for the alkaline etching is a sodium hydroxide solution;
the treatment liquid for washing is pure water.
Preferably, the method further comprises, after the anodic oxidation:
and (4) washing, sealing, washing and airing the aluminum alloy material in sequence.
Preferably, the closed treatment fluid is selected from hot water or an inorganic salt solution.
In the application, degreasing is used for removing oil stains and dust on the surface of the aluminum alloy, alkaline etching is used for removing a natural oxidation film layer on the surface of the aluminum alloy, and dilute hydrochloric acid is used for neutralizing and brightening before anodic oxidation, so that the aluminum oxide film layer with high purity and high adhesive force can be obtained in the anodic oxidation. The sealing is carried out after the anodic oxidation, which is favorable for improving the density of the oxide film layer and blocking the adsorption of the oxide film layer on impurities. All wash after degreasing, neutralization light-emitting, anodic oxidation and sealing treatment, in time detach and attach to the remaining treatment fluid in aluminum alloy surface, the cushioning effect of washing simultaneously still is favorable to generating the aluminium oxide film layer of even, low porosity in anodic oxidation process, improves the smoothness of surface oxidation film layer, avoids breeding the bacterium.
The application also provides an aluminum alloy ceramic water pipe which is obtained by the aluminum alloy surface oxidation treatment method;
the inner wall and the outer wall of the aluminum alloy ceramic water pipe are both provided with an aluminum oxide film layer.
In this application, can form fine and close and even aluminium oxide rete at the inner wall and the outer wall of aluminum alloy tubular product, it is strong to the surface treatment plasticity of aluminum alloy tubular product, and can keep excellent mechanical properties, effectively solve among the prior art and adopt processing methods such as ceramic idiosome sintering, opening pressure or bubble thick liquid to lead to the big, the poor defect of compressive property of fragility of shaping tubular product. The utility model provides an aluminum alloy ceramic water pipe carries out anodic oxidation treatment to high temperature extrusion's aluminum alloy tubular product, because the aluminium oxide rete of its inner wall, good leakproofness and chemical stability have, and the biosafety performance is excellent, can reach food sanitation level, can effectively stop the adhesion of bacterium, impurity, can ensure that quality of water is clean, sanitary, can be used as liquid pipeline fields such as running water or drinking water pipe, beer equipment pipe, cosmetics equipment pipe, dairy products equipment pipe or medicine manufacturing equipment pipe, it is convenient to have the installation, the advantage of low in cost.
Preferably, the thickness of the aluminum oxide film layer is 25-150 μm.
Preferably, the outer diameter of the aluminum alloy ceramic water pipe is 10-400 mm, and the wall thickness is 1.0-30 mm.
Preferably, the type of the aluminum alloy is 6061, 6065, 6005 or 6082.
In the application, the aluminum alloy has good material selection and processing performance and high toughness, and an oxide film is easily formed on the inner wall of the pipe. The aluminum alloy surface oxidation treatment method is wide in size range of applicable pipes, and the aluminum alloy materials can be processed into pipes of different specifications according to different use functions so as to meet the requirements of different fields on pipeline pressure.
In summary, the application provides an aluminum alloy surface oxidation treatment method and application and an aluminum alloy ceramic water pipe. The surface oxidation treatment method can form a compact and uniform ceramic layer (Al) on the surface of the aluminum alloy2O3) The ceramic layer has high hardness, strong wear resistance, high breakdown voltage resistance, low porosity, strong adhesive force and large thickness, and can not crack and age after long-term use; corrosion resistance, high temperature resistance, stable chemical property and good biological safety. The surface oxidation treatment method has strong plasticity for the surface treatment of the aluminum alloy pipe. The aluminum alloy ceramic water pipe has good sealing performance and chemical stability due to the aluminum oxide film layer on the inner wall, has excellent biological safety performance, can reach the food sanitation level, can be widely applied to water supply and drainage pipelines, gas pipelines, thermal pipelines or chemical containers, and can also be applied to fireproof building materials.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a photograph of an aluminum alloy ceramic water pipe manufactured in example 1 of the present application.
Detailed Description
In order to make the objects, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application are clearly and completely described, and it is obvious that the embodiments described below are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The hot extrusion forming aluminum alloy pipe (6061) is treated as follows:
(1) degreasing: fixing the head and tail parts of the aluminum alloy pipe on a bent frame by using a clamp, putting the aluminum alloy pipe into an organic solution at normal temperature for carrying out a soaking reaction, taking out the aluminum alloy pipe, washing the aluminum alloy pipe in pure water, removing oil stains and dust adhered to the surface of the aluminum alloy pipe, and taking out the aluminum alloy pipe;
(2) alkaline etching: putting the mixture into a sodium hydroxide solution at normal temperature, neutralizing and brightening the mixture in a hydrochloric acid solution with the mass concentration of 15% after the reaction is finished, and then washing the mixture in pure water and taking the mixture out;
(3) anodic oxidation: setting the initial voltage at 15V and the initial current density at 0.5A/dm at the temperature of 2 DEG C2Taking out the aluminum alloy pipe after reacting for 50min in sulfuric acid solution with the concentration of 250g/L by taking the aluminum alloy pipe as an anode and a metal conductor as a cathode, and washing the aluminum alloy pipe by pure water;
(4) and (3) sealing: and (3) sealing in an inorganic salt solution, and naturally drying on a bent frame after the reaction is finished to obtain the aluminum alloy ceramic water pipe.
The picture of the aluminum alloy ceramic water pipe prepared in the embodiment 1 is shown in fig. 1, the aluminum alloy ceramic water pipe obtained by the aluminum alloy surface oxidation treatment method forms compact and uniform aluminum oxide film layers on the inner wall and the outer wall, the thickness of the aluminum oxide film layer is 25 μm, and the aluminum alloy ceramic water pipe has the advantages of low porosity and strong adhesive force, so that the aluminum alloy ceramic water pipe has good sealing property and chemical stability as a water supply and drainage pipe, effectively prevents bacteria and impurities from adhering to the aluminum alloy ceramic water pipe, is corroded and deteriorates, shows excellent biological safety, and can reach the food sanitation level.
The aluminum alloy ceramic water pipe prepared in the embodiment 1 is tested for mechanical property, corrosion resistance, high temperature resistance and conductivity, and the test result shows that an Al2O3 film layer generated on the inner wall of the product prepared in the embodiment 1 is smooth and free of any corrosion, high temperature resistance and non-conductivity, good in uniformity, strong in adhesive force, high in strength, bending resistance and tensile strength, and meets various performance requirements of GB/T3091-2015 on a galvanized water pipe.
The safety performance test of the aluminum alloy ceramic water pipe prepared in the embodiment 1 is carried out by referring to the national standard GB4806.4-2016, and the result shows that the melting point of the inner wall of the product prepared in the embodiment 1 is increased to 2054 ℃ from the original 667 ℃, the ceramic layer has strong adhesion, low porosity and stable chemical property, does not generate harmful metal components and is not easy to adhere to harmful biomass, and the aluminum oxide film layer reaches the grade of edible ceramic and meets the national standard GB 4806.4-2016.
Because the aluminum alloy surface aluminium sesquioxide rete's of this application high temperature resistance characteristic, it can reach first grade to use the material for building fire prevention door and window, can replace steel fire prevention window, has the advantage that the cost is low, the stable performance.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. An aluminum alloy surface oxidation treatment method is characterized in that an aluminum alloy material is placed in electrolyte, and anodic oxidation treatment is carried out under the condition that voltage gradually rises.
2. The method for oxidizing the surface of an aluminum alloy according to claim 1, wherein the anodizing temperature is-10 to 5 ℃.
3. The aluminum alloy surface oxidation treatment method according to claim 1, wherein the anodizing electrolyte is selected from one or more of sulfuric acid, oxalic acid, and chromic acid;
the concentration of the electrolyte is 200-350 g/L.
4. The method for surface oxidation treatment of an aluminum alloy as set forth in claim 1, wherein the anodic oxidation voltage is 15 to 100V and the current density is 0.5 to 5A/dm2。
5. The method for surface oxidation treatment of an aluminum alloy as set forth in claim 1, wherein the anodic oxidation is carried out at an initial voltage of 15 to 20V and an initial current density of 0.5A/dm2The voltage increase rate is 3-5V/min, and the anodic oxidation time is 50 min.
6. The aluminum alloy surface oxidation treatment method according to claim 1, further comprising, before the anodic oxidation:
sequentially carrying out degreasing, water washing, alkaline etching, neutralization brightening and water washing on the aluminum alloy material;
the treatment liquid for neutralizing and brightening is hydrochloric acid;
the mass concentration of the hydrochloric acid is 10-25%.
7. Use of the aluminum alloy surface oxidation treatment method according to any one of claims 1 to 6 for plumbing pipes or fire-proof finishing materials.
8. An aluminum alloy ceramic water pipe, which is characterized by being obtained by the surface oxidation treatment method of the aluminum alloy according to any one of claims 1 to 6;
the inner wall and the outer wall of the aluminum alloy ceramic water pipe are both provided with an aluminum oxide film layer.
9. The aluminum alloy ceramic tube according to claim 8, wherein the thickness of the aluminum oxide film layer is 25 to 150 μm.
10. The aluminum alloy ceramic pipe according to claim 8, wherein the aluminum alloy ceramic water pipe has an outer diameter of 10 to 400mm and a wall thickness of 1.0 to 30 mm.
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Citations (9)
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|---|---|---|---|---|
| GB1185346A (en) * | 1966-09-09 | 1970-03-25 | Philips Electronic Associated | Improvements relating to Anodic Oxidation of Aluminium and Aluminium Alloys. |
| CN1920110A (en) * | 2006-07-26 | 2007-02-28 | 台山市金桥铝型材厂有限公司 | Anodic oxidation technology for inner and outer wall of aluminium tube |
| CN101445950A (en) * | 2008-11-27 | 2009-06-03 | 浙江苏泊尔股份有限公司 | Constant current anode oxidation treatment method for surfaces of aluminum and aluminum alloy materials |
| KR101558875B1 (en) * | 2015-03-18 | 2015-10-12 | (주)오양기업 | Simultaneous Anodic Oxidation Film Production Equipment for Aluminum Pipes |
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