Phosphorus- and nitrogen-free brighteners for aluminum parts and their processing technology

Abstract

This invention relates to the field of aluminum surface treatment technology, specifically to a phosphorus-free and nitrogen-free brightener for aluminum parts and its treatment process; it includes sulfuric acid, citric acid, penetrant ST-10, and a fluorinated mixed acid. The method includes: selecting a corrosion-resistant stirred tank as the preparation equipment and cleaning the equipment; accurately weighing 10% sulfuric acid, 15% citric acid, 13% penetrant ST-10, and 2% fluorinated mixed acid according to mass percentage, and slowly pouring them into the stirred tank in sequence; starting the stirred tank to mix all raw materials, so that the components are uniformly mixed to form a homogeneous brightener solution; taking a brightener sample from the stirred tank for performance testing; and sealing and storing the qualified brightener in an acid- and corrosion-resistant plastic bucket. This method effectively solves the problem of reduced gloss on the surface of aluminum parts when using existing brighteners, significantly improving the gloss of the aluminum parts surface and meeting the appearance requirements of high-quality aluminum products.

Description

Technical Field

[0001] This invention relates to the field of aluminum surface treatment technology, and in particular to a phosphorus-free and nitrogen-free brightening agent for aluminum parts and its aluminum part treatment process. Background Technology

[0002] In the field of metal surface treatment, aluminum parts are widely used in aerospace, automotive manufacturing, electronics and electrical appliances and many other industries due to their excellent properties such as light weight, high strength and corrosion resistance. During the processing of aluminum parts, surface treatment is often required to improve their appearance and performance, among which cleaning and brightening treatment is one of the key pretreatment processes.

[0003] Traditional aluminum cleaning and brightening treatments often rely on brighteners containing elements such as phosphorus and nitrogen. These brighteners play an important role for a certain period of time, enabling the aluminum parts to achieve a certain level of brightness and meet basic production requirements.

[0004] However, existing brighteners can reduce the gloss of aluminum parts during use, failing to meet the appearance requirements of high-quality aluminum products. Summary of the Invention

[0005] The purpose of this invention is to provide a phosphorus-free and nitrogen-free brightener for aluminum parts and its processing technology, aiming to solve the technical problem that the surface gloss of aluminum parts decreases during the use of brighteners in the prior art, which fails to meet the appearance requirements of high-quality aluminum parts products.

[0006] To achieve the above objectives, the present invention employs a phosphorus-free and nitrogen-free brightening agent for aluminum parts, comprising sulfuric acid, citric acid, penetrant ST-10, and a fluorine-containing mixed acid.

[0007] This invention also provides a phosphorus- and nitrogen-free aluminum parts brightening agent treatment process, comprising the following steps: A corrosion-resistant stirred tank was selected as the preparation equipment, and the equipment was cleaned. Accurately weigh 10% sulfuric acid, 15% citric acid, 13% penetrant ST-10, and 2% fluorine-containing mixed acid according to the mass percentage, and slowly pour the weighed sulfuric acid into the cleaned stirred tank. Then add citric acid, penetrant ST-10, and fluorine-containing mixed acid in sequence. Start the stirring tank to mix all raw materials, so that the components are evenly mixed to form a uniform brightener solution; The brightener sample extracted from the stirred tank was subjected to performance testing; The qualified brighteners should be sealed and stored in acid- and corrosion-resistant plastic containers.

[0008] Among the steps, the selection of a corrosion-resistant stirred tank as the preparation equipment and the cleaning of the equipment are as follows: A stirred tank with an inner wall and a stirring paddle made of acid- and corrosion-resistant materials was selected as the preparation equipment. Rinse the inner wall of the mixing vessel and the mixing blade thoroughly with clean water to wash away the dust, debris and visible impurities adhering to the surface. Prepare a 5% sodium hydroxide solution and slowly pour it into the stirred tank until the solution covers the stirring paddle. Soak for 30 minutes to remove residual oil and metal oxide contaminants from the equipment surface. Drain the sodium hydroxide solution and rinse the stirred tank repeatedly with industrial water until the rinse water is neutral when tested with pH paper.

[0009] In the step of accurately weighing 10% sulfuric acid, 15% citric acid, 13% penetrant ST-10, and 2% fluorinated mixed acid according to their mass percentages, and slowly pouring the weighed sulfuric acid into the cleaned stirred tank, followed by adding citric acid, penetrant ST-10, and fluorinated mixed acid in sequence: Prepare sulfuric acid, citric acid, penetrant ST-10, and fluorine-containing mixed acid raw materials; Using a precise electronic balance, accurately weigh 10% sulfuric acid according to the mass percentage and slowly pour it into the cleaned stirring tank. Weigh 15% citric acid using an electronic balance and slowly add it to the mixing tank; Weigh 13% ST-10 penetrant using an electronic balance and slowly add it to the stirred tank; Weigh 2% of the fluorinated mixed acid using an electronic balance and slowly add it to the stirred tank.

[0010] In the step of starting the stirring tank to mix all the raw materials, so that the components are evenly mixed to form a homogeneous brightener solution: Turn on the stirrer of the mixing vessel, adjust the stirring speed to 200 rpm, and set the stirring time to 30 minutes; During the mixing process, the mixing status of the raw materials in the mixing vessel should be observed regularly; After stirring for 30 minutes, stop stirring and observe whether the solution in the vessel is uniform and whether there is obvious stratification or unmixed raw material particles.

[0011] In the step of performance testing of the brightener sample extracted from the stirred tank: A certain amount of brightener sample was extracted from different locations in the stirred tank using a corrosion-resistant sampler, and after being mixed evenly, it was used as the test sample. Using a precision pH meter, insert the electrode into the test sample, and record the pH value of the brightener after the reading stabilizes. Select a standard aluminum sample and place it in the brightener, then process it according to the set process conditions; After the treatment is completed, observe the gloss level of the aluminum parts surface, whether there is any corrosion, and test its gloss effect and corrosion resistance to the aluminum parts; The content of phosphorus and nitrogen in brighteners was determined by spectrophotometry.

[0012] Among them, in the step of sealing and storing the qualified brightener in acid- and corrosion-resistant plastic buckets: Acid- and corrosion-resistant plastic buckets are selected as packaging containers. The packaging buckets are cleaned to remove dust and impurities, and then placed in drying equipment for drying. Pour the qualified brightener into the prepared packaging barrel at a uniform speed. After filling is completed, seal the packaging barrel with a sealing cap in time. Affix a label to the sealed packaging container containing information such as product name, ingredients, usage instructions, production date, and shelf life.

[0013] In the step of preparing the brightener bath for treating aluminum workpieces: Add 80% industrial water to the processing equipment, heat the industrial water to 35°C, and add 3%~5% of the above-mentioned brightener while stirring. After stirring for another 5 minutes, add the remaining industrial water to the equipment, stir again until homogeneous, and prepare a working fluid for treating aluminum parts. Immerse the aluminum workpiece in the working solution, control the temperature of the working solution at 35℃~55℃, and process for more than 2 minutes to complete the cleaning and brightening treatment of the aluminum workpiece.

[0014] This invention discloses a phosphorus-free and nitrogen-free brightener for aluminum parts and its aluminum part treatment process. The process involves the following steps: using a corrosion-resistant stirred tank as the preparation equipment and cleaning the equipment; accurately weighing 10% sulfuric acid, 15% citric acid, 13% penetrant ST-10, and 2% fluorinated mixed acid according to their mass percentages, and slowly pouring the weighed sulfuric acid into the cleaned stirred tank; then adding citric acid, penetrant ST-10, and the fluorinated mixed acid sequentially; starting the stirred tank to mix all raw materials, ensuring uniform mixing of all components to form a homogeneous brightener. Solution; a brightener sample extracted from the stirred tank is subjected to performance testing; the qualified brightener is sealed and stored in an acid- and corrosion-resistant plastic bucket; the brightener is used to prepare a bath solution for treating aluminum workpieces. In the above method, by using citric acid instead of nitric acid and adding penetrant ST-10, the same or even better brightening effect as nitric acid treatment can be achieved without using nitric acid. This effectively solves the problem of reduced surface gloss of aluminum parts when using existing brighteners, significantly improves the surface gloss of aluminum parts, and meets the appearance requirements of high-quality aluminum products. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of the aluminum part processing steps of the present invention, which uses phosphorus-free and nitrogen-free brightening agents for aluminum parts.

[0017] Figure 2 This is a flowchart of steps S100 of the present invention.

[0018] Figure 3 This is a flowchart of steps S200 of the present invention.

[0019] Figure 4 This is a flowchart of steps S300 of the present invention.

[0020] Figure 5 This is a flowchart of steps S400 of the present invention.

[0021] Figure 6 This is a flowchart of steps S500 of the present invention.

[0022] Figure 7 This is a flowchart of steps S600 of the present invention. Detailed Implementation

[0023] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.

[0024] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0025] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0026] This invention provides a phosphorus-free and nitrogen-free brightening agent for aluminum parts, comprising sulfuric acid, citric acid, penetrant ST-10, and a fluorine-containing mixed acid.

[0027] Please see Figures 1-7 This invention provides a phosphorus- and nitrogen-free aluminum parts brightening agent treatment process, comprising the following steps: S100: A corrosion-resistant stirred tank is selected as the preparation equipment, and the equipment is cleaned.

[0028] In this embodiment, a corrosion-resistant stirred tank is selected as the preparation equipment, and the equipment is cleaned. The specific process is as follows: S101: A stirred tank with an inner wall and a stirring paddle made of acid- and corrosion-resistant materials is selected as the preparation equipment; S102: Rinse the inner wall of the mixing vessel and the mixing blade thoroughly with clean water to wash away the dust, debris and visible impurities attached to the surface. S103: Prepare a 5% sodium hydroxide solution and slowly pour it into the stirred tank until the solution covers the stirring paddle. Soak for 30 minutes to remove residual oil and metal oxide contaminants from the equipment surface. S104: Drain the sodium hydroxide solution and rinse the stirred tank repeatedly with industrial water until the rinse water is neutral when tested with pH paper.

[0029] In the above process, firstly, a mixing vessel with an inner wall and agitator made of acid- and corrosion-resistant materials is selected as the preparation equipment; then, the inner wall of the mixing vessel and the agitator are thoroughly rinsed with clean water to wash away the dust, debris and visible impurities attached to the surface; then, a 5% sodium hydroxide solution is prepared and slowly poured into the mixing vessel so that the solution covers the agitator, and soaked for 30 minutes to remove residual oil and metal oxide contaminants on the surface of the equipment; then, the sodium hydroxide solution is drained, and the mixing vessel is repeatedly rinsed with industrial water until the rinsing water is neutral when tested with pH test paper.

[0030] S200: Accurately weigh 10% sulfuric acid, 15% citric acid, 13% penetrant ST-10 and 2% fluorine-containing mixed acid according to the mass percentage, and slowly pour the weighed sulfuric acid into the cleaned stirring tank, and add citric acid, penetrant ST-10 and fluorine-containing mixed acid in sequence.

[0031] In this embodiment, 10% sulfuric acid, 15% citric acid, 13% penetrant ST-10, and 2% fluorinated mixed acid are accurately weighed according to their mass percentages. The weighed sulfuric acid is then slowly poured into a cleaned stirred tank, followed by the sequential addition of citric acid, penetrant ST-10, and fluorinated mixed acid. The specific process is as follows: S201: Prepare sulfuric acid, citric acid, penetrant ST-10, and fluorine-containing mixed acid raw materials; S202: Using a precise electronic balance, accurately weigh 10% sulfuric acid according to the mass percentage and slowly pour it into the cleaned stirring tank; S203: Weigh 15% citric acid using an electronic balance and slowly add it to the mixing tank; S204: Weigh 13% of the penetrant ST-10 using an electronic balance and slowly add it to the stirred tank; S205: Weigh 2% of the fluorinated mixed acid using an electronic balance and slowly add it to the stirred tank.

[0032] In the above process, first prepare sulfuric acid, citric acid, penetrant ST-10, and fluorinated mixed acid raw materials; then, using a precise electronic balance, accurately weigh 10% sulfuric acid according to the mass percentage and slowly pour it into the cleaned stirred tank; weigh 15% citric acid using an electronic balance and slowly add it to the stirred tank; weigh 13% penetrant ST-10 using an electronic balance and slowly add it to the stirred tank; weigh 2% fluorinated mixed acid using an electronic balance and slowly add it to the stirred tank.

[0033] S300: Start the stirring tank to mix all raw materials, so that the components are evenly mixed to form a uniform brightener solution.

[0034] In this embodiment, the stirring tank is started to mix all raw materials, so that the components are evenly mixed to form a homogeneous brightener solution. The specific process is as follows: S301: Turn on the stirrer of the mixing vessel, adjust the stirring speed to 200 rpm, and set the stirring time to 30 min; S302: During the stirring process, observe the mixing status of the raw materials in the stirring vessel regularly; S303: After stirring for 30 minutes, stop stirring and observe whether the solution in the vessel is uniform and whether there is obvious stratification or unmixed raw material particles.

[0035] During the above process, turn on the stirrer of the mixing vessel, adjust the stirring speed to 200 rpm, and set the stirring time to 30 minutes. During the stirring process, observe the mixing of the raw materials in the mixing vessel at regular intervals. After stirring for 30 minutes, stop stirring and observe whether the solution in the vessel is uniform and whether there is obvious stratification or unmixed raw material particles.

[0036] S400: A brightener sample extracted from a stirred tank is subjected to performance testing.

[0037] In this embodiment, the brightener sample extracted from the stirred tank is subjected to performance testing. The specific process is as follows: S401: Use a corrosion-resistant sampler to extract a certain amount of brightener sample from different locations in the stirred tank, mix it evenly, and use it as the test sample; S402: Using a precision pH meter, insert the electrode into the test sample, and record the pH value of the brightener after the reading stabilizes. S403: Select a standard aluminum sample and place it in this brightener, then process it according to the set process conditions; S404: After the treatment is completed, observe the gloss level of the aluminum part surface, whether there is any corrosion, and test its gloss effect and corrosion resistance to the aluminum part.

[0038] In the above process, firstly, a certain amount of brightener sample is extracted from different positions in the stirred tank using a corrosion-resistant sampler, and after being mixed evenly, it is used as the test sample; then, a precision pH meter is used, and the electrode is inserted into the test sample. After the reading stabilizes, the pH value of the brightener is recorded; then, a standard aluminum part sample is selected and placed into the brightener, and processed according to the set process conditions; after the processing is completed, the gloss level of the aluminum part surface, whether there is corrosion, and the brightening effect and corrosion resistance to the aluminum part are observed.

[0039] S500: Qualified brighteners should be sealed and stored in acid- and corrosion-resistant plastic containers.

[0040] In this embodiment, the qualified brightener is sealed and stored in an acid- and corrosion-resistant plastic bucket. The specific process is as follows: S501: Use acid- and corrosion-resistant plastic buckets as packaging containers. Clean the packaging buckets to remove dust and impurities, and then put the packaging buckets into a drying device for drying. S502: Pour the qualified brightener into the prepared packaging barrel at a uniform speed. After filling is completed, seal the packaging barrel with a sealing cap in time. S503: Affix a label containing the product name, ingredients, instructions for use, production date, and shelf life to the sealed packaging container.

[0041] In the above process, firstly, acid- and corrosion-resistant plastic buckets are selected as packaging containers. The buckets are cleaned to remove dust and impurities, and then placed in a drying device for drying. Next, the qualified brightener is poured into the prepared buckets at a uniform rate. After filling, the buckets are sealed with a sealing cap in a timely manner. Finally, a label containing the product name, ingredients, usage instructions, production date, and shelf life information is affixed to the sealed buckets.

[0042] S600: Use brightener to prepare bath solution for treating aluminum workpieces.

[0043] In this embodiment, a brightener is used to prepare the bath solution for treating aluminum workpieces. The specific process is as follows: S601: Add 80% industrial water to the processing equipment, heat the industrial water to 35°C, and add 3%~5% of the above brightener while stirring. S602: After stirring for another 5 minutes, add the remaining industrial water to the equipment, stir again until homogeneous, and prepare a working fluid for treating aluminum parts. S603: Place the aluminum workpiece to be treated into the working solution, control the temperature of the working solution at 35℃~55℃, and the treatment time is greater than 2 minutes to complete the cleaning and brightening treatment of the aluminum workpiece.

[0044] In the above process, 80% industrial water is added to the treatment equipment, and the industrial water is heated to 35°C. While stirring, 3% to 5% of the above-mentioned brightener is added. After stirring for another 5 minutes, the remaining industrial water is added to the equipment, and the mixture is stirred again to prepare a working solution for treating aluminum parts. The aluminum parts to be treated are then placed in the working solution, and the temperature of the working solution is controlled at 35°C to 55°C. The treatment time is greater than 2 minutes to complete the cleaning and brightening treatment of the aluminum parts.

[0045] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0046] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A phosphorus-free and nitrogen-free brightening agent for aluminum parts, characterized in that, This includes sulfuric acid, citric acid, penetrant ST-10, and fluorinated mixed acids.

2. A process for treating aluminum parts with a phosphorus-free and nitrogen-free brightening agent, such as preparing the phosphorus-free and nitrogen-free brightening agent for aluminum parts as described in claim 1, characterized in that, Includes the following steps: A corrosion-resistant stirred tank was selected as the preparation equipment, and the equipment was cleaned. Accurately weigh 10% sulfuric acid, 15% citric acid, 13% penetrant ST-10, and 2% fluorine-containing mixed acid according to the mass percentage, and slowly pour the weighed sulfuric acid into the cleaned stirred tank. Then add citric acid, penetrant ST-10, and fluorine-containing mixed acid in sequence. Start the stirring tank to mix all raw materials, so that the components are evenly mixed to form a uniform brightener solution; The brightener sample extracted from the stirred tank was subjected to performance testing; The qualified brighteners should be sealed and stored in acid- and corrosion-resistant plastic buckets. Brighteners are used to prepare the bath solution for treating aluminum workpieces.

3. The aluminum part processing technology for phosphorus-free and nitrogen-free brighteners as described in claim 2, characterized in that, In the steps of selecting a corrosion-resistant stirred tank as the preparation equipment and cleaning the equipment: A stirred tank with an inner wall and a stirring paddle made of acid- and corrosion-resistant materials was selected as the preparation equipment. Rinse the inner wall of the mixing vessel and the mixing blade thoroughly with clean water to wash away the dust, debris and visible impurities adhering to the surface. Prepare a 5% sodium hydroxide solution and slowly pour it into the stirred tank until the solution covers the stirring paddle. Soak for 30 minutes to remove residual oil and metal oxide contaminants from the equipment surface. Drain the sodium hydroxide solution and rinse the stirred tank repeatedly with industrial water until the rinse water is neutral when tested with pH paper.

4. The aluminum part processing technology for phosphorus-free and nitrogen-free brighteners as described in claim 2, characterized in that, In the step of accurately weighing 10% sulfuric acid, 15% citric acid, 13% penetrant ST-10, and 2% fluorinated mixed acid according to the mass percentage, and slowly pouring the weighed sulfuric acid into the cleaned stirred tank, and then adding citric acid, penetrant ST-10, and fluorinated mixed acid in sequence: Prepare sulfuric acid, citric acid, penetrant ST-10, and fluorine-containing mixed acid raw materials; Using a precise electronic balance, accurately weigh 10% sulfuric acid according to the mass percentage and slowly pour it into the cleaned stirring tank. Weigh 15% citric acid using an electronic balance and slowly add it to the mixing tank; Weigh 13% ST-10 penetrant using an electronic balance and slowly add it to the stirred tank; Weigh 2% of the fluorinated mixed acid using an electronic balance and slowly add it to the stirred tank.

5. The aluminum part processing technology for phosphorus-free and nitrogen-free brighteners as described in claim 2, characterized in that, In the step of starting the stirring tank to mix all raw materials, ensuring uniform mixing of all components to form a homogeneous brightener solution: Turn on the stirrer of the mixing vessel, adjust the stirring speed to 200 rpm, and set the stirring time to 30 minutes; During the mixing process, the mixing status of the raw materials in the mixing vessel should be observed regularly; After stirring for 30 minutes, stop stirring and observe whether the solution in the vessel is uniform and whether there is obvious stratification or unmixed raw material particles.

6. The aluminum part processing technology for phosphorus-free and nitrogen-free brightening agents as described in claim 2, characterized in that, In the performance testing step of the brightener sample extracted from the stirred tank: A certain amount of brightener sample was extracted from different locations in the stirred tank using a corrosion-resistant sampler, and after being mixed evenly, it was used as the test sample. Using a precision pH meter, insert the electrode into the test sample, and record the pH value of the brightener after the reading stabilizes. Select a standard aluminum sample and place it in the brightener, then process it according to the set process conditions; After the treatment is completed, observe the gloss level of the aluminum parts surface, whether there is any corrosion, and test its gloss effect and corrosion resistance to the aluminum parts; The content of phosphorus and nitrogen in brighteners was determined by spectrophotometry.

7. The aluminum part processing technology for phosphorus-free and nitrogen-free brighteners as described in claim 2, characterized in that, In the step of sealing and storing the qualified brightener in acid- and corrosion-resistant plastic buckets: Acid- and corrosion-resistant plastic buckets are selected as packaging containers. The packaging buckets are cleaned to remove dust and impurities, and then placed in drying equipment for drying. Pour the qualified brightener into the prepared packaging barrel at a uniform speed. After filling is completed, seal the packaging barrel with a sealing cap in time. Affix a label to the sealed packaging container containing information such as product name, ingredients, usage instructions, production date, and shelf life.

8. The aluminum part processing technology for phosphorus-free and nitrogen-free brightening agents as described in claim 2, characterized in that, In the step of preparing a brightening agent into a bath solution for treating aluminum workpieces: Add 80% industrial water to the processing equipment, heat the industrial water to 35°C, and add 3%~5% of the above-mentioned brightener while stirring. After stirring for another 5 minutes, add the remaining industrial water to the equipment, stir again until homogeneous, and prepare a working fluid for treating aluminum parts. Immerse the aluminum workpiece in the working solution, control the temperature of the working solution at 35℃~55℃, and process for more than 2 minutes to complete the cleaning and brightening treatment of the aluminum workpiece.

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