WO2018218434A1 - Brightening agent, aluminum alloy workpiece, and surface ash removal and brightening method therefor - Google Patents

Abstract

A brightening agent, an ash removal and brightening method for an aluminum alloy workpiece, and the aluminum alloy workpiece. The brightening agent comprises the following components in mass contents: 50 g/L to 500 g/L of nitric acid, 1 g/L to 200 g/L of phosphoric acid, 1 g/L to 50 g/L of chromic anhydride, 1 g/L to 200 g/L of sulfuric acid, 1 g/L to 10 g/L of nonylphenol polyoxyethylene ether, and 200 g/L to 500 g/L of water. The brightening agent can effectively remove stains, mold release agents and black rusts on the surface of the aluminum alloy workpiece, and can effectively remove black ash generated after acid corrosion and alkali corrosion are performed, so as to form a clean and bright surface, and the brightening agent provides excellent binding force for subsequent passivation or spray coating or electroplating, and is applicable to a variety of aluminum alloy workpieces (except, aluminum cast die), such as aluminum alloy 6061 and aluminum alloy 7072.

Description

 Title: Light-emitting agent, aluminum alloy workpiece and surface ash-extracting method

 [0001] The present invention relates to the field of metal surface treatment technology, and in particular, to a light-emitting agent, an aluminum alloy workpiece, and a surface ash-extracting method thereof.

 Background technique

 [0002] In order to improve the surface properties or appearance of a product, the surface treatment technology of the workpiece is usually applied. For example, the surface treatment of aluminum and iron alloys goes deep into all walks of life. Moreover, most of the work needs to be pretreated before it can be processed, for example, cleaning, decontamination and degreasing.

[0003] Generally, aluminum alloy alloys contain a large amount of black ash which is produced by strong acid-base treatment due to other components such as silicon, copper, and zinc. The usual chemical treatment method is concentrated nitric acid plus sulfuric acid. This method is intense, producing a large amount of toxic yellow smoke and the black ash cannot be well removed.

 technical problem

 [0004] In view of the above, the invention provides a light-emitting agent with good ash-extracting effect, no yellow smoke and certain passivation effect, and an aluminum alloy workpiece and a surface ash-removing treatment method thereof, which can effectively remove the surface of the aluminum alloy workpiece. Stains, release agents, black skin and black ash from acid etching and alkali corrosion form a clean, shiny surface that provides excellent bonding for subsequent passivation, oxidation, spraying or plating.

 Problem solution

 Technical solution

 [0005] A light-emitting agent for removing black ash on the surface of an aluminum alloy workpiece, comprising the following components: 50-5 00g/L nitric acid, l-200g/L phosphoric acid, l-50g/L chromic anhydride, l- 200 g/L sulfuric acid, l-10 g/L nonylphenol ethoxylate, 200-500 g/L water.

 [0006] A method for removing ash light from a surface of an aluminum alloy workpiece, comprising the steps of: preparing a light-emitting agent as described above; treating the aluminum alloy workpiece with a light-emitting solution, and after performing a predetermined daytime treatment, washing with water.

 [0007] Also, an aluminum alloy workpiece whose surface is subjected to surface treatment by the surface treatment of the aluminum alloy workpiece as described above, and then passivated, oxidized, sprayed or plated to form a protective film.

Advantageous effects of the invention Beneficial effect

 [0008] The above light-emitting agent can effectively remove the stain on the surface of the aluminum alloy workpiece, the release agent, the black skin, and the black ash generated by the acid etching and the alkali corrosion to form a clean and bright surface for subsequent passivation, oxidation, and spraying. Or plating, etc. provide excellent bonding. Operation 吋 no nitrogen oxides and yellow smoke gas, which is beneficial to the environment and the health of the operator. The above light-emitting agent can be applied to various aluminum alloy workpieces (except for die-cast aluminum), such as: aluminum alloy 6 061, aluminum alloy 7072, and the like.

Embodiments of the invention

The present invention will be described in detail below with reference to specific embodiments.

 [0010] Embodiments of the present invention provide a light-emitting agent for surface ash removal treatment of aluminum alloy workpieces, including the following components: 50-500 g/L nitric acid, l-200 g/L phosphoric acid, l-50 g/ L chromic anhydride, l-200g/L sulfuric acid, l-10g/L nonylphenol ethoxylate, 200-500g/L water. Among them, nitric acid is a 68% by mass nitric acid solution, phosphoric acid is a phosphoric acid solution with a mass fraction of 85%, and sulfuric acid is a concentrated sulfuric acid solution having a mass fraction of 98%.

 [0011] Specifically, the mass content of the nitric acid is preferably from 100 to 500. Preferably, the chromium anhydride has a mass content of from 10 to 40 g/L. The mass content of the phosphoric acid is preferably from 50 to 100 g/L, and the mass content of the sulfuric acid is from 50 to 100 g/L. In the case of using hydrazine, the luminescent agent is preferably used in a dilution volume concentration of 700 to 1000 ml / liter, and a pH of not more than 2.

 [0012] In the above-mentioned light-emitting agent, the balance of each of the distribution ratios is controlled to achieve a better ash-removing effect. E.g

Nitric acid, chromic anhydride provides oxidative properties for removing black ash and has a passivating effect on the workpiece. Sulfuric acid, phosphoric acid helps provide acidity, and phosphoric acid also acts as a buffer to make the deashing process more gradual. Nonylphenol ethoxylates allow the reaction to be uniform without pitting corrosion and stain removal.

[0013] The light-emitting agent of the present embodiment is suitable for various aluminum alloy workpieces, and the black light ash generated by the aluminum alloy worker after pickling or alkali washing can effectively remove black ash and light.

[0014] An embodiment of the present invention further provides a method for removing ash light from a surface of an aluminum alloy workpiece, which comprises the following steps

: The light-emitting agent as described above is prepared; the light-emitting agent is dissolved in water to prepare a light-emitting solution, and the aluminum alloy workpiece is treated with the light-emitting solution, and after a predetermined daytime treatment, it is washed with water.

[0015] Specifically, before the aluminum alloy workpiece is treated with the light-emitting solution, the aluminum alloy workpiece is degreased, the aluminum alloy workpiece is treated with the light-emitting solution, and the aluminum alloy workpiece is washed, and then passivated, oxidized, sprayed, Electricity The surface of the aluminum alloy workpiece is treated by plating. Preferably, the light-emitting solution is treated by immersing the aluminum alloy workpiece with a light-emitting solution at a treatment temperature of 0-30 ° C, and the immersion aluminum alloy workpiece is between 10 and 120 seconds. Further, the light-emitting agent preferably has a dilution volume concentration of from 700 to 1000 ml/liter, preferably from 800 to 950 ml/liter, and a pH of less than 2.

 [0016] The enamel solution can be prepared in a cleaning tank, which adopts an acid-resistant plastic tank, a glass steel tank or a low carbon steel, and the glass reinforced plastic tank or low carbon steel is lined with a PVC plastic, and the aluminum alloy is treated with aluminum. The alloy workpiece is immersed in the light-emitting solution in the tank.

 [0017] Embodiments of the present invention also provide an aluminum alloy workpiece, the surface of which is subjected to surface treatment by the surface treatment method of the aluminum alloy workpiece as described above, and then the protective film is formed by passivation, oxidation, spraying, and electroplating. Of course, it can also be used for other aluminum alloy workpieces that require ash removal treatment.

 [0018] The above-mentioned light-emitting agent can effectively remove the stain on the surface of the aluminum alloy workpiece, the release agent, the black skin and the black ash generated by the acid etching and the alkali corrosion to form a clean and bright surface for subsequent passivation, oxidation and spraying. , plating, etc. provide excellent bonding. Due to the black ash generated by pickling or alkali washing of the aluminum alloy, the glazing agent on the surface of the aluminum material can be quickly removed by the light-emitting agent, and the aluminum member can be restored to the original color, the adhesion of the film and the anti-corrosion property are improved, and the environment is environmentally friendly. It is produced without nitrogen oxides and yellow smoke, which is good for the environment and the health of the operators. The above-mentioned light-emitting agent is suitable for various aluminum alloy workpieces (except for die-cast aluminum), such as: aluminum alloy 6061, aluminum alloy 7072, and the like.

 [0019] Hereinafter, the light-emitting agent, the passivation treatment method and the like of the embodiments of the present invention are described by way of specific examples.

Embodiment 1

 [0021] The components were mixed according to the following weights: 500 g of nitric acid, lg phosphoric acid, lg chromic anhydride, lg sulfuric acid, lg nonylphenol polyoxyethylene ether, water was added to 1 L, stirred, uniformly mixed, and formulated into a light-emitting agent.

[0022] Processing method: preparing the light-emitting agent as described above; dissolving the light-emitting agent in water to prepare a light-emitting solution, the light-emitting volume concentration is 700 ml/liter, controlling the pH value to be less than 2, and then treating the black-containing solution with the light-emitting solution The ash aluminum alloy workpiece is washed after 2 minutes of treatment.

[0023] After the above-mentioned light-emitting solution treatment, the surface of the workpiece was observed, and the surface of the workpiece was found to be white and clean, and the black ash removal degree was 97% or more, no spots, no pitting corrosion.

[0024] Example 2

[0025] The ingredients are mixed according to the following weights: 400 g parts of nitric acid, 20 g of phosphoric acid, 10 g of chromic anhydride, 20 g of sulfuric acid, 3 g of hydrazine Phenolic polyoxyethylene ether, add water to 1L, stir, mix well, and prepare a light-emitting agent.

[0026] Treatment method: preparing the light-emitting agent as described above; dissolving the light-emitting agent in water to prepare a light-emitting solution, the light-emitting volume concentration is 900 ml/liter, controlling the pH value to be less than 2, and then treating the black-containing solution with the light-emitting solution The ash aluminum alloy workpiece is washed after 2 minutes of treatment.

[0027] After the above-mentioned light-emitting solution treatment, the surface of the workpiece was observed, and the surface of the workpiece was found to be white and clean, and the black ash removal degree was over 99%, no spots, no pitting corrosion.

Embodiment 3

 [0029] The ingredients were mixed according to the following weights: 300 g parts of nitric acid, 50 g of phosphoric acid, 20 g of chromic anhydride, 50 g of sulfuric acid, 5 g of nonylphenol ethoxylate, water was added to 1 L, stirred, and uniformly mixed to prepare a light-emitting agent.

[0030] Processing method: preparing the light-emitting agent as described above; dissolving the light-emitting agent in water to prepare a light-emitting solution, the light-emitting volume concentration is 900 ml/liter, controlling the pH value to be less than 2, and then treating the black-containing solution with the light-emitting solution The ash aluminum alloy workpiece is washed after 2 minutes of treatment.

[0031] After the above-mentioned light-emitting solution treatment, the surface of the workpiece was observed, and the surface of the workpiece was found to be white and clean, and the black ash removal degree was 98% or more, no spots, no pitting corrosion.

Embodiment 4

 [0033] The ingredients were mixed according to the following weight: 200 g parts of nitric acid, 200 g of phosphoric acid, 40 g of chromic anhydride, 200 g of sulfuric acid, 7 g of nonylphenol ethoxylate, water was added to 1 L, stirred, and uniformly mixed to prepare a light-emitting agent.

[0034] Processing method: preparing the light-emitting agent as described above; dissolving the light-emitting agent in water to prepare a light-emitting solution, the volume concentration of the light-emitting agent is 800 ml/liter, controlling the pH value to be less than 2, and then treating the black-containing solution with the light-emitting solution The ash aluminum alloy workpiece is washed after 2 minutes of treatment.

[0035] After the above-mentioned light-emitting solution treatment, the surface of the workpiece was observed, and the surface of the workpiece was found to be white and clean, and the black ash removal degree was observed.

More than 97%, no spots, no pitting corrosion.

Embodiment 5

 [0037] The ingredients were mixed according to the following weights: 100 g parts of nitric acid, 100 g of phosphoric acid, 50 g of chromic anhydride, 100 g of sulfuric acid, 10 g of nonylphenol ethoxylate, water was added to 1 L, stirred, and uniformly mixed to prepare a light-emitting agent.

[0038] Processing method: preparing the light-emitting agent as described above; dissolving the light-emitting agent in water to prepare a light-emitting solution, the volume concentration of the light-emitting agent is 800 ml/liter, controlling the pH value to be less than 2, and then treating the black-containing solution with the light-emitting solution The ash aluminum alloy workpiece is washed after 2 minutes of treatment. [0039] After the above-mentioned light-emitting solution treatment, the surface of the workpiece was observed, and the surface of the workpiece was found to be white and clean, and the black ash removal degree was over 95%, no spots, no pitting corrosion.

[0040] It should be noted that the present invention is not limited to the above embodiments, and other changes may be made by those skilled in the art according to the inventive spirit of the present invention, and the changes according to the inventive spirit of the present invention should be It is intended to be included within the scope of the invention as claimed.

Claims

Claim A light-emitting agent for removing black ash and stains on the surface of an aluminum alloy workpiece, characterized by comprising the following mass components: 50-500 g/L nitric acid, l-200 g/L phosphoric acid, l-50 g/L chromic anhydride , l-200g/L sulfuric acid, l-10g/L nonylphenol ethoxylate, 200-500g/L water, the light-emitting agent according to claim 1, wherein the nitric acid has a mass content of 100 - 300g/L. The light-emitting agent according to claim 1, wherein the chromic anhydride has a mass content of 10 to 40 g/L. The light-emitting agent according to claim 1, wherein the phosphoric acid has a mass content of 50 to 100 g/L. The light-emitting agent according to claim 1, wherein the sulfuric acid has a mass content of 50 to 100 g/L. The light-emitting agent according to claim 1, wherein the nonylphenol ethoxylate has a mass content of from 10 to 10 g/L. The light-emitting agent according to claim 1, wherein the light-emitting agent has a 吋 PH value of not more than 2. An aluminum alloy workpiece surface ash removing treatment method, comprising the steps of: preparing the light-emitting agent according to any one of claims 1 to 7; dissolving the light-emitting agent in water to prepare a light-emitting solution, and treating the aluminum alloy with the light-emitting solution; The workpiece is washed with water after a predetermined daytime treatment. The method for removing ash from a surface of an aluminum alloy workpiece according to claim 8, wherein before the aluminum alloy workpiece is treated with the light-emitting solution, the aluminum alloy workpiece is degreased, and after the aluminum alloy workpiece is treated by the light-emitting solution, The aluminum alloy workpiece is washed again, and then the surface of the aluminum alloy workpiece is passivated, oxidized, sprayed or plated. The method for removing ash from a surface of an aluminum alloy workpiece according to claim 7, wherein the light-emitting solution is treated by immersing or spraying an aluminum alloy workpiece with a light-emitting solution, and the treatment temperature is 0-30 ° C, the immersion The aluminum alloy workpiece is 10-120 seconds between turns. An aluminum alloy workpiece, characterized in that the surface of the aluminum alloy workpiece is subjected to surface treatment by the method for removing ash from the surface of the aluminum alloy workpiece according to any one of claims 8 to 10, The protective film is formed by passivation, oxidation, spraying, plating, or the like.