CN112725865A - Surface treatment process of high-strength corrosion-resistant aluminum alloy for wheelchair processing - Google Patents
Surface treatment process of high-strength corrosion-resistant aluminum alloy for wheelchair processing Download PDFInfo
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- CN112725865A CN112725865A CN202011546140.0A CN202011546140A CN112725865A CN 112725865 A CN112725865 A CN 112725865A CN 202011546140 A CN202011546140 A CN 202011546140A CN 112725865 A CN112725865 A CN 112725865A
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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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- 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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- 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
- C25D11/24—Chemical after-treatment
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Abstract
The invention provides a surface treatment process of a high-strength corrosion-resistant aluminum alloy for wheelchair processing, belonging to the technical field of aluminum alloy surface treatment and comprising the following treatment steps: (1) surface cleaning: polishing the surface of an aluminum alloy workpiece, soaking the aluminum alloy workpiece in an oil removing agent for 1-2 hours, washing the aluminum alloy workpiece with hot water, and drying the surface water; (2) primary surface activation; (3) hard anodizing; (4) secondary surface activation; (5) adding rare earth oxide film. The surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing is simple and convenient to operate, can be used for carrying out surface treatment on the aluminum alloy, can remarkably improve the strength and the corrosion resistance of the treated aluminum alloy, and is suitable for industrial large-scale production.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy surface treatment, and particularly relates to a surface treatment process of high-strength corrosion-resistant aluminum alloy for wheelchair processing.
Background
The wheelchair accessories comprise an armrest fixing frame, an armrest fixing seat, a wheelchair front fork and the like, and the accessories are mainly made of aluminum alloy or stainless steel metal. Aluminum has good ductility, high plasticity, easy machining, and good corrosion resistance, but pure aluminum has low strength and therefore needs to be alloyed with other metals to be used as a structural material. Although the strength of aluminum is improved, the corrosion resistance of the aluminum alloy is reduced, and high-strength metals such as copper, zinc, lithium and the like are added into the aluminum, but the metals are expensive, and the processing technology is complex, so that the cost of the aluminum alloy is high.
In order to improve the strength and corrosion resistance of the aluminum alloy, another more convenient and cheaper way is adopted at present, namely, the surface of the aluminum alloy is treated to form a high-strength corrosion-resistant layer on the surface of the aluminum alloy so as to achieve the effect of improving the strength and corrosion resistance. In the prior art, the surface treatment process for the aluminum alloy is complex in operation and more in steps.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing, which is simple and convenient to operate, can be used for carrying out surface treatment on the aluminum alloy, can obviously improve the strength and the corrosion resistance of the treated aluminum alloy, and is suitable for industrial large-scale production.
In order to achieve the purpose, the invention is realized by the following technical scheme: a surface treatment process of high-strength corrosion-resistant aluminum alloy for machining wheelchairs comprises the following treatment steps:
(1) surface cleaning: polishing the surface of an aluminum alloy workpiece, removing surface impurities after polishing, then placing the aluminum alloy workpiece in an oil removing agent for soaking for 1-2 hours, keeping the temperature of a solution in the oil removing agent at 65-75 ℃, washing the surface of the aluminum alloy workpiece clean by hot water after soaking is finished, and then drying the surface moisture;
(2) primary surface activation: placing the cleaned aluminum alloy workpiece in a dilute sulfuric acid solution for surface activation, wherein the activation temperature is kept at 50-65 ℃, and the activation time is 0.5-1 h;
(3) hard anodizing: placing the aluminum alloy workpiece subjected to primary activation in electrolyte for anodic oxidation treatment, wherein the oxidation current is 1-2A/dm2, the voltage is 10-15V, the oxidation temperature is 40-65 ℃, and the oxidation time is 0.5-1 h;
(4) surface secondary activation: taking out the anodized aluminum alloy workpiece, washing the surface oxidation liquid with hot water, and then placing the aluminum alloy workpiece in a dilute sulfuric acid solution for surface activation, wherein the activation temperature is kept between 50 and 65 ℃, and the activation time is 0.5 to 1 hour;
(5) adding a rare earth oxide film: and (3) placing the secondarily activated aluminum alloy workpiece into a conversion solution containing rare earth element chloride, keeping the temperature of the conversion solution at 90-100 ℃ in the reaction process, reacting for 0.5-1h, taking out the aluminum alloy workpiece after the reaction is finished, and drying the surface of the aluminum alloy workpiece. The hard anodic oxidation can form a hard oxide film on the surface of the aluminum alloy, so that the strength of the aluminum alloy is enhanced; the rare earth oxide film is added on the surface of the aluminum alloy to enhance the corrosion resistance of the aluminum alloy, the formation of a hard oxide film on the surface of the aluminum alloy can be promoted by primary activation, and the formation of the rare earth oxide film on the surface of the aluminum alloy can be promoted by secondary activation.
Further, the oil removing agent in the step (1) adopts a sodium carbonate solution with the mass concentration of 15-25%.
Further, the mass concentration of the dilute sulfuric acid solution in the step (2) is 5-10%.
Further, the electrolyte in the step (3) is composed of the following components in parts by weight: 15-25 parts of sulfuric acid, 5-10 parts of propylene glycol, 5-15 parts of sulfosalicylic acid and 85-100 parts of deionized water. The sulfuric acid is used as electrolyte, so that the transparency of the oxide film on the surface of the aluminum alloy is better, the hardness of the oxide film is enhanced by adding a certain amount of sulfosalicylic acid, and the forming of the oxide film can be promoted by propylene glycol.
Further, the electrolyte in the step (3) is composed of the following components in parts by weight: 20 parts of sulfuric acid, 7 parts of propylene glycol, 10 parts of sulfosalicylic acid and 92 parts of deionized water.
Further, the mass concentration of the dilute sulfuric acid solution in the step (4) is 5-10%.
Further, the mass concentration of the rare earth element chloride in the step (5) is 1-3%.
Further, the rare earth element chloride in the step (5) is selected from one or more of cerium chloride, lanthanum chloride, yttrium chloride or praseodymium chloride. The aluminum alloy is put into the solution of rare earth chloride, and a conversion film containing rare earth metal oxide or hydroxide can be formed on the surface of the aluminum alloy, and the corrosion resistance of the aluminum alloy can be improved by the conversion film.
Further, the rare earth element chloride in the step (5) is selected from cerium chloride.
Further, the conversion solution in the step (5) comprises the following components in parts by weight: 5-10 parts of potassium permanganate, 85-100 parts of deionized water and 1-5 parts of sodium chloride. The potassium permanganate can promote the film forming speed and reduce the film forming temperature.
Has the advantages that: compared with the prior art, the invention has the following advantages: according to the surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing, which is provided by the invention, the surface treatment process is simple and convenient to operate, the aluminum alloy can be subjected to surface treatment, and a hard oxide film can be formed on the surface of the aluminum alloy through hard anodic oxidation, so that the strength of the aluminum alloy is enhanced; adding a rare earth oxide film on the surface of the aluminum alloy to enhance the corrosion resistance of the aluminum alloy, wherein the formation of a hard oxide film on the surface of the aluminum alloy can be promoted by primary activation, and the formation of a rare earth oxide film on the surface of the aluminum alloy can be promoted by secondary activation; the treated aluminum alloy can obviously improve the strength and the corrosion resistance, and is suitable for industrial large-scale production.
Drawings
FIG. 1 is a flow chart of a surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing according to the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and specific examples.
Example 1
A surface treatment process of high-strength corrosion-resistant aluminum alloy for machining wheelchairs comprises the following treatment steps:
(1) surface cleaning: polishing the surface of an aluminum alloy workpiece, removing surface impurities after polishing, then soaking the aluminum alloy workpiece in a sodium carbonate solution with the mass concentration of 15% for 1h to remove oil, keeping the temperature of the sodium carbonate solution at 65 ℃, washing the surface of the aluminum alloy workpiece clean by hot water after soaking is finished, and then drying the surface moisture;
(2) primary surface activation: placing the cleaned aluminum alloy workpiece in a dilute sulfuric acid solution with the mass concentration of 5% for surface activation, wherein the activation temperature is kept at 50 ℃, and the activation time is 0.5 h;
(3) hard anodizing: placing the aluminum alloy workpiece subjected to primary activation into electrolyte for anodic oxidation treatment, wherein the electrolyte comprises the following components in parts by weight: 15 parts of sulfuric acid, 5 parts of propylene glycol, 5 parts of sulfosalicylic acid and 85 parts of deionized water, wherein the oxidation current is 1A/dm2, the voltage is 10V, the oxidation temperature is 40 ℃, and the oxidation time is 0.5 h;
(4) surface secondary activation: taking out the anodized aluminum alloy workpiece, washing the surface oxidation liquid by hot water, and then placing the aluminum alloy workpiece in a dilute sulfuric acid solution with the mass concentration of 5% for surface activation, wherein the activation temperature is kept at 50 ℃ and the activation time is 0.5 h;
(5) adding a rare earth oxide film: placing the secondarily activated aluminum alloy workpiece in a conversion solution containing a rare earth element chloride with a mass concentration of 1%, wherein the rare earth element chloride can be selected from one or more of cerium chloride, lanthanum chloride, yttrium chloride or praseodymium chloride, in this embodiment, the conversion solution is selected from cerium chloride, and the conversion solution is composed of the following components in parts by weight: 5 parts of potassium permanganate, 85 parts of deionized water and 1 part of sodium chloride, keeping the temperature of the conversion solution at 90 ℃ in the reaction process, reacting for 0.5h, taking out the aluminum alloy workpiece after the reaction is finished, and drying the surface of the aluminum alloy workpiece.
Example 2
A surface treatment process of high-strength corrosion-resistant aluminum alloy for machining wheelchairs comprises the following treatment steps:
(1) surface cleaning: polishing the surface of an aluminum alloy workpiece, removing surface impurities after polishing, then soaking the aluminum alloy workpiece in a sodium carbonate solution with the mass concentration of 25% for 2 hours to remove oil, keeping the temperature of the sodium carbonate solution at 75 ℃, washing the surface of the aluminum alloy workpiece clean by hot water after soaking is finished, and then drying the surface moisture;
(2) primary surface activation: placing the cleaned aluminum alloy workpiece in a dilute sulfuric acid solution with the mass concentration of 10% for surface activation, wherein the activation temperature is kept at 65 ℃, and the activation time is 1 h;
(3) hard anodizing: placing the aluminum alloy workpiece subjected to primary activation into electrolyte for anodic oxidation treatment, wherein the aluminum alloy workpiece is subjected to anodic oxidation treatmentThe electrolyte comprises the following components in parts by weight: 25 parts of sulfuric acid, 10 parts of propylene glycol, 15 parts of sulfosalicylic acid and 100 parts of deionized water, and the oxidation current is 2A/dm2The voltage is 15V, the oxidation temperature is 65 ℃, and the oxidation time is 1 h;
(4) surface secondary activation: taking out the anodized aluminum alloy workpiece, washing the surface oxidation liquid by hot water, and then placing the aluminum alloy workpiece in a dilute sulfuric acid solution with the mass concentration of 10% for surface activation, wherein the activation temperature is kept at 65 ℃ and the activation time is 1 h;
(5) adding a rare earth oxide film: placing the secondarily activated aluminum alloy workpiece into a conversion solution containing cerium chloride with the mass concentration of 3%, wherein the conversion solution comprises the following components in parts by weight: 10 parts of potassium permanganate, 100 parts of deionized water and 5 parts of sodium chloride, keeping the temperature of the conversion solution at 100 ℃ in the reaction process, reacting for 1h, taking out the aluminum alloy workpiece after the reaction is finished, and drying the surface of the aluminum alloy workpiece.
Example 3
A surface treatment process of high-strength corrosion-resistant aluminum alloy for machining wheelchairs comprises the following treatment steps:
(1) surface cleaning: polishing the surface of an aluminum alloy workpiece, removing surface impurities after polishing, then soaking the aluminum alloy workpiece in a sodium carbonate solution with the mass concentration of 20% for 1.5h to remove oil, keeping the temperature of the sodium carbonate solution at 70 ℃, washing the surface of the aluminum alloy workpiece with hot water after soaking is finished, and then drying the surface water;
(2) primary surface activation: placing the cleaned aluminum alloy workpiece in a dilute sulfuric acid solution with the mass concentration of 7.5% for surface activation, wherein the activation temperature is kept at 57 ℃, and the activation time is 0.7 h;
(3) hard anodizing: placing the aluminum alloy workpiece subjected to primary activation into electrolyte for anodic oxidation treatment, wherein the electrolyte comprises the following components in parts by weight: 20 parts of sulfuric acid, 7 parts of propylene glycol, 10 parts of sulfosalicylic acid and 92 parts of deionized water, wherein the oxidation current is 1.5A/dm2The voltage is 12V, the oxidation temperature is 47 ℃, and the oxidation time is 0.7 h;
(4) surface secondary activation: taking out the anodized aluminum alloy workpiece, washing the surface oxidation liquid by hot water, and then placing the aluminum alloy workpiece in a dilute sulfuric acid solution with the mass concentration of 7% for surface activation, wherein the activation temperature is kept at 57 ℃, and the activation time is 0.7 h;
(5) adding a rare earth oxide film: placing the secondarily activated aluminum alloy workpiece into a conversion solution containing cerium chloride with the mass concentration of 2%, wherein the conversion solution comprises the following components in parts by weight: 7 parts of potassium permanganate, 92 parts of deionized water and 3 parts of sodium chloride, keeping the temperature of the conversion solution at 95 ℃ in the reaction process, reacting for 0.7h, taking out the aluminum alloy workpiece after the reaction is finished, and drying the surface of the aluminum alloy workpiece.
Comparative example 1
The comparative example is that of example 3, in which only the aluminum alloy workpieces were subjected to the treatments of step 1 to step 3, and the processing techniques and parameters were the same as those of example 3, and the surfaces of the aluminum alloys were free from the rare earth conversion films.
Comparative example 2
This comparative example is a comparative example of example 3 in which only the aluminum alloy workpieces were subjected to the treatments of step 1, step 2 and step 5, and the working processes and parameters were the same as those of example 3, and the aluminum alloy surfaces were free from anodic oxide films.
Comparative example 3
This comparative example is a blank comparative example, and the surface of the aluminum alloy thereof is free from the rare earth conversion film and the anodic oxide film.
In order to verify that the aluminum alloy processed by the surface treatment process has higher strength and corrosion resistance, the aluminum alloys of the examples and the comparative examples are subjected to a bonding strength test, a surface hardness test and a corrosion weight loss test, a concentrated sulfuric acid solution is selected as a corrosion solution, the surface of the aluminum alloy is washed at 100 ℃, the residual weight is tested after 40 hours, the weight loss rate is calculated, the corrosion resistance is evaluated by a neutral salt spray corrosion test, the humidity and heat resistance is evaluated by a humidity and heat resistance test, and the experimental results are shown in the following table 1.
Table 1 results of performance testing
| Surface hardness/%) | Corrosion weight loss ratio/%) | Bonding strength/MPa | |
| Example 1 | 100 | 3.5 | 48 |
| Example 2 | 100 | 1.2 | 61 |
| Example 3 | 100 | 2.4 | 53 |
| Comparative example 1 | 84 | 45.6 | 47 |
| Comparative example 2 | 76 | 31.5 | 46 |
| Comparative example 3 | 48 | 58.3 | / |
The results show that the aluminum alloy prepared by the surface treatment process has higher strength and better corrosion resistance, and the hard anodic oxidation can form a hard oxide film on the surface of the aluminum alloy so as to enhance the strength of the aluminum alloy; the rare earth oxide film is added on the surface of the aluminum alloy to enhance the corrosion resistance of the aluminum alloy, and the oxide film is firmly combined with the surface of the aluminum alloy.
The foregoing is directed to embodiments of the present invention and, more particularly, to a method and apparatus for controlling a power converter in a power converter, including a power converter, a power converter.
Claims (10)
1. A surface treatment process of high-strength corrosion-resistant aluminum alloy for wheelchair processing is characterized by comprising the following steps: the method comprises the following processing steps:
(1) surface cleaning: polishing the surface of an aluminum alloy workpiece, removing surface impurities after polishing, then placing the aluminum alloy workpiece in an oil removing agent for soaking for 1-2 hours, keeping the temperature of a solution in the oil removing agent at 65-75 ℃, washing the surface of the aluminum alloy workpiece clean by hot water after soaking is finished, and then drying the surface moisture;
(2) primary surface activation: placing the cleaned aluminum alloy workpiece in a dilute sulfuric acid solution for surface activation, wherein the activation temperature is kept at 50-65 ℃, and the activation time is 0.5-1 h;
(3) hard anodizing: placing the aluminum alloy workpiece subjected to primary activation in electrolyte for anodic oxidation treatment, wherein the oxidation current is 1-2A/dm2, the voltage is 10-15V, the oxidation temperature is 40-65 ℃, and the oxidation time is 0.5-1 h;
(4) surface secondary activation: taking out the anodized aluminum alloy workpiece, washing the surface oxidation liquid with hot water, and then placing the aluminum alloy workpiece in a dilute sulfuric acid solution for surface activation, wherein the activation temperature is kept between 50 and 65 ℃, and the activation time is 0.5 to 1 hour;
(5) adding a rare earth oxide film: and (3) placing the secondarily activated aluminum alloy workpiece into a conversion solution containing rare earth element chloride, keeping the temperature of the conversion solution at 90-100 ℃ in the reaction process, reacting for 0.5-1h, taking out the aluminum alloy workpiece after the reaction is finished, and drying the surface of the aluminum alloy workpiece.
2. The surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing according to claim 1, comprising the steps of: the degreasing agent in the step (1) adopts a sodium carbonate solution with the mass concentration of 15-25%.
3. The surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing according to claim 1, comprising the steps of: the mass concentration of the dilute sulfuric acid solution in the step (2) is 5-10%.
4. The surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing according to claim 1, comprising the steps of: the electrolyte in the step (3) is composed of the following components in parts by weight: 15-25 parts of sulfuric acid, 5-10 parts of propylene glycol, 5-15 parts of sulfosalicylic acid and 85-100 parts of deionized water.
5. The surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing as claimed in claim 4, wherein: the electrolyte in the step (3) is composed of the following components in parts by weight: 20 parts of sulfuric acid, 7 parts of propylene glycol, 10 parts of sulfosalicylic acid and 92 parts of deionized water.
6. The surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing according to claim 1, comprising the steps of: the mass concentration of the dilute sulfuric acid solution in the step (4) is 5-10%.
7. The surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing according to claim 1, comprising the steps of: the mass concentration of the rare earth element chloride in the step (5) is 1-3%.
8. The surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing as claimed in claim 1 or 7, wherein: the rare earth element chloride in the step (5) is selected from one or more of cerium chloride, lanthanum chloride, yttrium chloride or praseodymium chloride.
9. The surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing according to claim 8, wherein: the rare earth element chloride in the step (5) is selected from cerium chloride.
10. The surface treatment process of the high-strength corrosion-resistant aluminum alloy for wheelchair processing according to claim 1, comprising the steps of: the conversion solution in the step (5) comprises the following components in parts by weight: 5-10 parts of potassium permanganate, 85-100 parts of deionized water and 1-5 parts of sodium chloride.
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Cited By (2)
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| CN115041380A (en) * | 2022-06-09 | 2022-09-13 | 安徽鑫强徽幕墙材料有限公司 | Aluminum veneer surface spraying process |
| 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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