A degreasing solution for metal alloy surface treatment, a preparation method and application thereof

Abstract

The application relates to the technical field of metal alloy surface treatment, and discloses a degreasing solution for metal alloy surface treatment, a preparation method and application, which comprises the following components: sodium hydroxide, a surfactant, a tetrahydroxy metal porphyrin, hydrogen peroxide, hydrazine hydrate and water; preferably, the content of each component is as follows in mass fraction: 6.2-8.6 parts of sodium hydroxide, 2.1-3.4 parts of the surfactant, 4.3-7.2 parts of the tetrahydroxy metal porphyrin, 5.5-6.3 parts of hydrogen peroxide, 3.1-4.3 parts of hydrazine hydrate and 35-55 parts of water. The sodium hydroxide, the surfactant, the tetrahydroxy metal porphyrin, the hydrogen peroxide and the hydrazine hydrate are mixed in proportion, the sodium hydroxide and the hydrazine hydrate remove dirt and grease on the surface of the metal alloy, the tetrahydroxy metal porphyrin and the hydrogen peroxide degrade and remove pigments attached to the surface of the metal alloy under the action of light, and the scheme has good dirt and grease removal effect and high pigment degradation capacity.

Description

Technical Field

[0001] This invention relates to the field of metal alloy surface treatment technology, specifically to a degreasing solution for metal alloy surface treatment, its preparation method, and its application. Background Technology

[0002] Metal alloy surface treatment is a series of processes performed to improve the properties of metal alloys and extend their service life. Common metal alloy surface treatment methods include:

[0003] 1. Coating: A coating is an external material that is applied to the surface of a metal, such as by electroplating, hot-dip galvanizing, or chemical plating, to provide properties such as corrosion resistance, wear resistance, and aesthetic appeal.

[0004] 2. Hydrophobic treatment: Using coatings or chemical treatments to make the metal surface hydrophobic, preventing moisture and humidity from corroding the metal.

[0005] 3. Hardening treatment: This involves altering the crystal structure of a metal through heating and cooling to increase its hardness and strength, such as quenching and tempering.

[0006] 4. Rust prevention treatment: Chemical treatment or coating methods are used to form a protective film on the metal surface, which prevents the metal from contacting the air and prevents oxidation and corrosion.

[0007] 5. Polishing and grinding: Using mechanical or chemical methods, remove unevenness and dirt from the metal surface to make it smooth and shiny.

[0008] 6. Spraying: Using spraying technology, protective or decorative coatings are evenly sprayed onto the metal surface to achieve effects such as corrosion prevention, oxidation prevention, and beautification.

[0009] Most of the surface treatment methods described above require degreasing of the metal alloy surface before the treatment process, which necessitates the use of a degreasing solution. A degreasing solution is a solvent used to remove grease and dirt from metal surfaces. It is typically used to clean metal surfaces in preparation for subsequent surface treatments or coating processes.

[0010] Most existing degreasing solutions can only remove dirt and grease from the surface of metal alloys, but they cannot effectively remove some metal alloys with pigments adhering to them, thus affecting the subsequent processing of metal alloys. Summary of the Invention

[0011] The purpose of this invention is to provide a degreasing solution, preparation method and application for surface treatment of metal alloys, so as to solve the problem that the existing degreasing solution cannot efficiently remove some metal alloys with pigments adhering to them, thus affecting the subsequent processing of metal alloys.

[0012] To achieve the above objectives, the present invention provides the following technical solution: The first aspect of the present invention provides a degreasing solution for surface treatment of metal alloys, comprising the following components:

[0013] Sodium hydroxide, surfactant, tetrahydroxymetalporphyrin, hydrogen peroxide, hydrazine hydrate, water.

[0014] Preferably, the content of each component, by mass parts, is as follows:

[0015] Sodium hydroxide 6.2–8.6 parts, surfactant 2.1–3.4 parts, tetrahydroxymetalloporphyrin 4.3–7.2 parts, hydrogen peroxide 5.5–6.3 parts, hydrazine hydrate 3.1–4.3 parts, water 35–55 parts.

[0016] Preferably, the content ratio of sodium hydroxide to hydrazine hydrate is 2:1.

[0017] Preferably, the surfactant is one or more of sodium dodecylbenzenesulfonate, sodium dodecyl sulfate, or sodium fatty alcohol ether sulfate.

[0018] Preferably, the tetrahydroxy metalloporphyrin is one or more of tetrahydroxy zinc porphyrin, tetrahydroxy copper porphyrin, or tetrahydroxy cobalt porphyrin.

[0019] A second aspect of the present invention provides a method for preparing the degreasing solution described in the first aspect of the present invention, comprising the following steps:

[0020] S1, Synthesis of tetrahydroxymetalloporphyrin:

[0021] Weigh p-hydroxybenzaldehyde and pyrrole in a molar ratio of 1:1 and add them to the reaction vessel. Then add an appropriate amount of propionic acid and DMSO, reflux the reaction, and after the reaction is complete, purify to obtain tetrahydroxyporphyrin.

[0022] Then, tetrahydroxyporphyrin and metal acetate were mixed in a molar ratio of 1:5 and poured into a reaction vessel. Then, an appropriate amount of DMF was added, and the mixture was refluxed. After the reaction was completed, the mixture was purified to obtain tetrahydroxymetalporphyrin.

[0023] S2. Add water and hydrogen peroxide to the container, then add sodium hydroxide and hydrazine hydrate in sequence, stir for 15-25 minutes, then add surfactant and tetrahydroxymetalloporphyrin, mix well to obtain degreasing solution for later use.

[0024] Preferably, the metal acetate is one of zinc acetate, copper acetate, or cobalt acetate.

[0025] A third aspect of the present invention provides an application of the degreasing liquid described in the first aspect of the present invention, wherein the degreasing liquid can be used for degreasing treatment of metal alloy surfaces.

[0026] This invention has at least the following beneficial effects:

[0027] This invention provides a degreasing solution for metal alloy surface treatment, its preparation method, and its application. Sodium hydroxide, surfactant, tetrahydroxyporphyrin, hydrogen peroxide, hydrazine hydrate, and water are mixed in a specific ratio. Sodium hydroxide and hydrazine hydrate remove dirt and grease from the metal alloy surface, while tetrahydroxyporphyrin and hydrogen peroxide, under light irradiation, degrade and remove pigments adhering to the metal alloy surface. This solution not only has a good effect on removing dirt and grease but also has a high pigment degradation capacity. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] A degreasing solution for surface treatment of metal alloys, comprising the following components:

[0031] Sodium hydroxide, surfactant, tetrahydroxymetalporphyrin, hydrogen peroxide, hydrazine hydrate, water.

[0032] The content of each component, by mass parts, is as follows:

[0033] Sodium hydroxide 6.2 parts, surfactant 2.1 parts, tetrahydroxymetalporphyrin 4.3 parts, hydrogen peroxide 5.5 parts, hydrazine hydrate 3.1 parts, water 35 parts.

[0034] The ratio of sodium hydroxide to hydrazine hydrate is 2:1; the surfactant is sodium dodecylbenzenesulfonate; and the tetrahydroxy metalloporphyrin is tetrahydroxyzinc porphyrin.

[0035] The above method for preparing the degreasing solution includes the following steps:

[0036] S1, Synthesis of tetrahydroxyzinc porphyrin:

[0037] Weigh p-hydroxybenzaldehyde and pyrrole in a molar ratio of 1:1 and add them to the reaction vessel. Then add an appropriate amount of propionic acid and DMSO. Reflux at 145°C for 1 hour. After the reaction is complete, let stand overnight, filter, wash with propionic acid, and recrystallize with anhydrous ethanol to obtain tetrahydroxyporphyrin.

[0038] Then, tetrahydroxyporphyrin and zinc acetate were mixed in a molar ratio of 1:5 and poured into a reaction vessel. An appropriate amount of DMF was then added, and the mixture was refluxed at 150°C for 50 min. After the reaction was complete, deionized water was added for aging, followed by filtration and washing with deionized water to obtain tetrahydroxyzinc porphyrin, with the following structural formula:

[0039]

[0040] S2. Add water and hydrogen peroxide to the container, then add sodium hydroxide and hydrazine hydrate in sequence, stir for 15 minutes, then add surfactant and tetrahydroxymetalloporphyrin, mix well to obtain degreasing solution for later use.

[0041] Example 2

[0042] A degreasing solution for surface treatment of metal alloys, comprising the following components:

[0043] Sodium hydroxide, surfactant, tetrahydroxymetalporphyrin, hydrogen peroxide, hydrazine hydrate, water.

[0044] The content of each component, by mass parts, is as follows:

[0045] Sodium hydroxide 7.6 parts, surfactant 2.7 parts, tetrahydroxy metalloporphyrin 6.3 parts, hydrogen peroxide 5.8 parts, hydrazine hydrate 3.8 parts, water 43 parts.

[0046] The ratio of sodium hydroxide to hydrazine hydrate is 2:1; the surfactant is sodium dodecyl sulfate; and the tetrahydroxy metalloporphyrin is tetrahydroxy copper porphyrin.

[0047] The above method for preparing the degreasing solution includes the following steps:

[0048] S1, Synthesis of tetrahydroxycopper porphyrin:

[0049] Weigh p-hydroxybenzaldehyde and pyrrole in a molar ratio of 1:1 and add them to the reaction vessel. Then add an appropriate amount of propionic acid and DMSO. Reflux at 147°C for 1.2 h. After the reaction is complete, let stand overnight, filter, wash with propionic acid, and recrystallize with anhydrous ethanol to obtain tetrahydroxyporphyrin.

[0050] Then, tetrahydroxyporphyrin and copper acetate were mixed in a molar ratio of 1:5 and poured into a reaction vessel. An appropriate amount of DMF was then added, and the mixture was refluxed at 155°C for 55 min. After the reaction was complete, deionized water was added for aging, followed by filtration and washing with deionized water to obtain tetrahydroxycopper porphyrin, with the following structural formula:

[0051]

[0052] S2. Add water and hydrogen peroxide to the container, then add sodium hydroxide and hydrazine hydrate in sequence, stir for 20 minutes, then add surfactant and tetrahydroxymetalloporphyrin, mix well to obtain degreasing solution for later use.

[0053] Example 3

[0054] A degreasing solution for surface treatment of metal alloys, comprising the following components:

[0055] Sodium hydroxide, surfactant, tetrahydroxymetalporphyrin, hydrogen peroxide, hydrazine hydrate, water.

[0056] The content of each component, by mass parts, is as follows:

[0057] Sodium hydroxide 8.6 parts, surfactant 3.4 parts, tetrahydroxymetalloporphyrin 7.2 parts, hydrogen peroxide 6.3 parts, hydrazine hydrate 4.3 parts, water 55 parts.

[0058] The ratio of sodium hydroxide to hydrazine hydrate is 2:1; the surfactant is sodium fatty alcohol ether sulfate; and the tetrahydroxy metalloporphyrin is tetrahydroxycobalt porphyrin.

[0059] The above method for preparing the degreasing solution includes the following steps:

[0060] S1, Synthesis of tetrahydroxycobalt porphyrin:

[0061] Weigh p-hydroxybenzaldehyde and pyrrole in a molar ratio of 1:1 and add them to the reaction vessel. Then add an appropriate amount of propionic acid and DMSO. Reflux at 150°C for 1.5 h. After the reaction is complete, let stand overnight, filter, wash with propionic acid, and recrystallize with anhydrous ethanol to obtain tetrahydroxyporphyrin.

[0062] Then, tetrahydroxyporphyrin and cobalt acetate were mixed in a molar ratio of 1:5 and poured into a reaction vessel. An appropriate amount of DMF was then added, and the mixture was refluxed at 160°C for 60 min. After the reaction was complete, deionized water was added for aging, followed by filtration and washing with deionized water to obtain tetrahydroxycobalt porphyrin, with the following structural formula:

[0063]

[0064] S2. Add water and hydrogen peroxide to the container, then add sodium hydroxide and hydrazine hydrate in sequence, stir for 25 minutes, then add surfactant and tetrahydroxymetalloporphyrin, mix well to obtain degreasing solution for later use.

[0065] The degreasing solutions prepared in Examples 1-3 above can be used for degreasing treatment of metal alloy surfaces. The metal alloy is placed in the prepared degreasing solution and irradiated with a fluorescent lamp. Sodium hydroxide and hydrazine hydrate work together to remove dirt and grease from the surface of the metal alloy. Tetrahydroxy metalloporphyrin and hydrogen peroxide work together under the action of light to exert a photocatalytic effect, degrading and removing pigments attached to the surface of the metal alloy.

[0066] The product prepared in Example 3 above was compared with existing phosphorus-free silicate degreasing liquid and phosphate degreasing liquid in terms of relevant performance tests. The results are shown in the table below:

[0067]

[0068]

[0069] In summary, the degreasing solution provided by this invention not only has a good effect on removing dirt and grease, but also has a high pigment degradation ability, and has broad application prospects.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A degreasing solution for surface treatment of metal alloys, characterized in that, The content of each component, by mass parts, is as follows: Sodium hydroxide 6.2–8.6 parts, surfactant 2.1–3.4 parts, tetrahydroxymetalloporphyrin 4.3–7.2 parts, hydrogen peroxide 5.5–6.3 parts, hydrazine hydrate 3.1–4.3 parts, water 35–55 parts; The content ratio of sodium hydroxide to hydrazine hydrate is 2:

1.

2. The degreasing solution for surface treatment of metal alloys according to claim 1, characterized in that, The surfactant is one or more of sodium dodecylbenzenesulfonate, sodium dodecyl sulfate, or sodium fatty alcohol ether sulfate.

3. The degreasing solution for surface treatment of metal alloys according to claim 1, characterized in that, The tetrahydroxy metalloporphyrin is one or more of tetrahydroxy zinc porphyrin, tetrahydroxy copper porphyrin, or tetrahydroxy cobalt porphyrin.

4. A method for preparing the degreasing solution as described in any one of claims 1 to 3, characterized in that, Includes the following steps: S1, Synthesis of tetrahydroxymetalloporphyrin: Weigh p-hydroxybenzaldehyde and pyrrole in a molar ratio of 1:1 and add them to the reaction vessel. Then add an appropriate amount of propionic acid and DMSO, reflux the reaction, and after the reaction is complete, purify to obtain tetrahydroxyporphyrin. Then, tetrahydroxyporphyrin and metal acetate were mixed in a molar ratio of 1:5 and poured into a reaction vessel. Then, an appropriate amount of DMF was added, and the mixture was refluxed. After the reaction was completed, the mixture was purified to obtain tetrahydroxymetalporphyrin. S2. Add water and hydrogen peroxide to the container, then add sodium hydroxide and hydrazine hydrate in sequence, stir for 15-25 minutes, then add surfactant and tetrahydroxymetalloporphyrin, mix well to obtain degreasing solution for later use.

5. The preparation method according to claim 4, characterized in that, The metal acetate is one of zinc acetate, copper acetate, or cobalt acetate.

6. An application of the degreasing liquid as described in any one of claims 1 to 3, characterized in that, The degreasing solution can be used for degreasing treatment of metal alloy surfaces.

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