Nickel removal method for anodic aluminum oxide production

Abstract

The invention discloses a nickel removal method for anodic aluminum oxide production, which comprises the following steps: S1, an aluminum alloy material containing nickel impurities is soaked in a pretreatment solution, and the pretreatment solution comprises an acid solution, a surfactant, a chelating agent and water; s2, the soaked aluminum alloy material is put into a solution containing an oxidizing agent to be subjected to oxidation treatment; s3, after oxidation treatment, the aluminum alloy material is transferred into a cleaning tank containing an efficient adsorbent so as to remove free nickel ions; and S4, the cleaned aluminum alloy material is subjected to water washing and drying treatment, and the nickel removal process is completed. According to the nickel removal method for anodic aluminum oxide production, the used chemical reagents are common industrial chemicals with reasonable prices, the treatment process is simple and easy to implement, the cost is low, meanwhile, the removal rate of nickel impurities is effectively increased, and the influence on the environment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metal surface treatment, in particular to a method for removing nickel in anodized aluminum production. Background Art

[0002] In the processing of aluminum alloy materials, trace amounts of nickel are often introduced due to raw materials or production equipment. These nickel elements not only affect the physical properties of aluminum alloys, such as conductivity, corrosion resistance and mechanical strength, but also may cause the quality of the oxide film to deteriorate during anodizing, affecting the aesthetics and service life of the product. Anodizing is one of the common methods to improve the corrosion resistance, wear resistance and decorative properties of aluminum alloy surfaces, but the presence of nickel impurities seriously affects the effect of this process.

[0003] At present, the methods for removing nickel impurities from aluminum alloys mainly include chemical impregnation, electrolytic purification and physical adsorption. However, these methods have certain limitations. Although the chemical impregnation method can remove some nickel impurities, the removal efficiency is not high and the processing time is long; the electrolytic purification method may cause material surface damage due to improper current density control, increasing production costs; although the physical adsorption method can effectively remove nickel ions, the selection and regeneration of adsorbents limit its wide application. In addition, while removing nickel impurities, the above methods are often accompanied by a large amount of wastewater discharge, which has an adverse impact on the environment. Therefore, there is an urgent need for an efficient, economical and environmentally friendly method for removing nickel from anodized aluminum. Summary of the invention

[0004] 1. Technical Problems Solved The technical problems to be solved by the present invention are the various problems mentioned in the above background technology, and a method for removing nickel in the production of anodized aluminum is provided. Technical Solution

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is: a method for removing nickel from anodized aluminum production, comprising the following steps: S1. Soaking the aluminum alloy material containing nickel impurities in a pretreatment solution, wherein the pretreatment solution comprises an acidic solution, a surfactant, a chelating agent and water; S2, the aluminum alloy material after soaking is then placed in a solution containing an oxidant for oxidation treatment; S3. After oxidation treatment, the aluminum alloy material is transferred to a cleaning tank containing a high-efficiency adsorbent to remove free nickel ions; S4. The cleaned aluminum alloy material is washed with water and dried to complete the nickel removal process.

[0006] As an improvement, the acidic solution in the pretreatment solution is preferably sulfuric acid, and its concentration is 3%-7% (volume ratio).

[0007] As an improvement, the surfactant in the pretreatment liquid is preferably sodium dodecyl sulfate, and its mass fraction is 0.05%-0.2%.

[0008] As an improvement, the chelating agent in the pretreatment solution is preferably EDTA, and its mass fraction is 0.3%-0.7%.

[0009] As an improvement, the proportion of water in the pretreatment liquid is adjusted according to the total amount of other components to ensure that each component is fully dissolved without affecting the use effect.

[0010] As an improvement, the oxidant solution is preferably a hydrogen peroxide solution with a concentration of 8%-12% (volume ratio).

[0011] As an improvement, the high-efficiency adsorbent is preferably activated carbon powder with a particle size of 10 μm-50 μm.

[0012] As an improvement, the soaking time in the pretreatment liquid is 20 minutes to 40 minutes.

[0013] As an improvement, the oxidation treatment time is 45 minutes to 75 minutes.

[0014] As an improvement, the adsorption treatment time is 20 minutes to 40 minutes. Beneficial Effects

[0015] The advantages of the present invention compared with the prior art are: The present invention provides a method for removing nickel from anodized aluminum production. By sequentially subjecting aluminum alloy materials containing nickel impurities to the steps of soaking in a pretreatment solution, oxidation treatment with an oxidant solution, cleaning with a high-efficiency adsorbent, and washing and drying, the removal efficiency of nickel impurities can be significantly improved while maintaining a low processing cost and a small environmental impact. The pretreatment solution used in the method has a unique formula. The synergistic effect of the acidic solution, surfactant, and chelating agent can effectively activate the surface of the aluminum alloy and promote the release of nickel ions; the oxidant solution further enhances the free effect of nickel ions; and the selective adsorption characteristics of the high-efficiency adsorbent ensure the effective removal of nickel ions. In addition, the method is easy to operate and has a wide range of applications. It is particularly suitable for aluminum alloy materials that require high-quality anodizing treatment and has important practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a flowchart of the steps of a method for removing nickel from anodized aluminum production. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Example

[0018] like Figure 1 As shown, a method for removing nickel from anodized aluminum production comprises the following steps: S1. Soaking the aluminum alloy material containing nickel impurities in a pretreatment solution, wherein the pretreatment solution comprises an acidic solution, a surfactant, a chelating agent and water; S2, the aluminum alloy material after soaking is then placed in a solution containing an oxidant for oxidation treatment; S3. After oxidation treatment, the aluminum alloy material is transferred to a cleaning tank containing a high-efficiency adsorbent to remove free nickel ions; S4. The cleaned aluminum alloy material is washed with water and dried to complete the nickel removal process.

[0019] The acidic solution in the pretreatment liquid is preferably sulfuric acid, and its concentration is 3%-7% (volume ratio). The surfactant in the pretreatment liquid is preferably sodium dodecyl sulfate, and its mass fraction is 0.05%-0.2%. As an improvement, the chelating agent in the pretreatment liquid is preferably EDTA, and its mass fraction is 0.3%-0.7%. The proportion of water in the pretreatment liquid is adjusted according to the total amount of other components to ensure that each component is fully dissolved without affecting the use effect. The oxidant solution is preferably a hydrogen peroxide solution, and its concentration is 8%-12% (volume ratio). The high-efficiency adsorbent is preferably activated carbon powder, and its particle size is 10μm-50μm.

[0020] The immersion time of the pretreatment solution is 20 minutes to 40 minutes, the oxidation treatment time is 45 minutes to 75 minutes, and the adsorption treatment time is 20 minutes to 40 minutes.

[0021] In the specific implementation of the present invention, first, a pretreatment solution is prepared, which contains 3%-7% (volume ratio) sulfuric acid as an acidic solution, 0.05%-0.2% (mass fraction) sodium dodecyl sulfate as a surfactant, and 0.3%-0.7% (mass fraction) EDTA as a chelating agent, and the rest is water, to ensure that all components are fully dissolved and do not affect the use effect. The aluminum alloy material containing nickel impurities is placed in the pretreatment solution and soaked for 20 minutes to 40 minutes. This step is to activate the surface of the aluminum alloy and promote the release of nickel ions.

[0022] Next, the pretreated aluminum alloy material is transferred to an oxidant solution containing 8%-12% (volume ratio) hydrogen peroxide for 45 minutes to 75 minutes of oxidation treatment. The purpose of the oxidation treatment is to further activate the material surface and enhance the ability of nickel ions to be freed from the aluminum alloy matrix.

[0023] After the oxidation treatment is completed, the aluminum alloy material is immediately moved into a cleaning tank filled with a high-efficiency adsorbent - activated carbon powder with a particle size of 10μm-50μm, and left to stand for 20 minutes to 40 minutes to remove the free nickel ions using the selective adsorption effect of the activated carbon powder.

[0024] Finally, the cleaned aluminum alloy material is thoroughly rinsed with deionized water several times to remove residual chemicals on the surface, and then dried naturally or by hot air drying to complete the entire nickel removal process.

[0025] The chemical reagents used in this embodiment are all common and reasonably priced industrial chemicals. The treatment process is simple and easy with low cost. At the same time, it effectively improves the removal rate of nickel impurities and reduces the impact on the environment. It is suitable for aluminum alloy materials of various specifications and types, especially for those aluminum alloy materials that require high-quality anodizing treatment.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0028] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A method for removing nickel from anodized aluminum production, characterized in that: The following steps are involved: S1. Soaking the aluminum alloy material containing nickel impurities in a pretreatment solution, wherein the pretreatment solution comprises an acidic solution, a surfactant, a chelating agent and water; S2, the aluminum alloy material after soaking is then placed in a solution containing an oxidant for oxidation treatment; S3. After oxidation treatment, the aluminum alloy material is transferred to a cleaning tank containing a high-efficiency adsorbent to remove free nickel ions; S4. The cleaned aluminum alloy material is washed with water and dried to complete the nickel removal process.

2. The method for removing nickel from anodized aluminum according to claim 1, characterized in that: The acidic solution in the pretreatment solution is preferably sulfuric acid, and its concentration is 3%-7% (volume ratio).

3. The method for removing nickel from anodized aluminum according to claim 1, characterized in that: The surfactant in the pretreatment liquid is preferably sodium dodecyl sulfate, and its mass fraction is 0.05%-0.2%.

4. The method for removing nickel from anodized aluminum production according to claim 1, characterized in that: The chelating agent in the pretreatment solution is preferably EDTA, and its mass fraction is 0.3%-0.7%.

5. The method for removing nickel from anodized aluminum production according to claim 1, characterized in that: The proportion of water in the pretreatment liquid is adjusted according to the total amount of other components to ensure that each component is fully dissolved without affecting the use effect.

6. The method for removing nickel from anodized aluminum according to claim 1, characterized in that: The oxidant solution is preferably a hydrogen peroxide solution with a concentration of 8%-12% (volume ratio).

7. The method for removing nickel from anodized aluminum production according to claim 1, characterized in that: The high-efficiency adsorbent is preferably activated carbon powder, and its particle size is 10 μm-50 μm.

8. The method for removing nickel from anodized aluminum production according to claim 1, characterized in that: The soaking time of the pretreatment solution is 20 minutes to 40 minutes.

9. The method for removing nickel from anodized aluminum according to claim 1, characterized in that: The oxidation treatment time is 45 minutes to 75 minutes.

10. The method for removing nickel from anodized aluminum production according to claim 1, characterized in that: The adsorption treatment time is 20 minutes to 40 minutes.

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