An anodic oxidation staining surface conditioner and its usage method

Abstract

The present invention relates to an anodic oxidation dyeing surface conditioner and a method for using the same. The surface conditioner comprises a first component and a second component. The first component is composed of 100 parts by weight of sulfamic acid, 40 - 60 parts by weight of sodium benzoate, 30 - 50 parts by weight of sodium acetate and 10 - 20 parts by weight of sodium carbonate. The second component is an aqueous solution of quaternary ammonium salt at 0.001 - 0.1 g / L. The surface conditioner of the present invention is an acidic white - light yellow powder. It is specifically used for the pretreatment before dyeing after anodic oxidation, can effectively prevent poor dyeing caused by acid vomiting of complex parts such as blind holes, threaded holes, and aluminum-plastic combinations, avoid problems such as white spots and blooming caused by insufficient water washing, reduce the introduction of oxidation liquid and other impurities, and extend the service life of dyes. It has excellent effects on dyes for die-cast aluminum with a loose surface.

Description

Technical Field

[0001] The present invention relates to an anodic oxidation dyeing surface conditioner and a method for using the same. Background Art

[0002] A surface conditioner is used for steel, zinc and their alloy metals to change the microscopic state of the surface of metal workpieces. At a short time and a relatively low temperature, a large number of crystal nucleus phosphating growth points are adsorbed on the surface of the workpieces by a colloid, so that the surface activity of the workpieces is made uniform.

[0003] In the existing application scenarios, after the metal workpieces are anodized, blind holes and threaded holes are likely to appear on the surface of the metal workpieces. Especially for complex parts with more aluminum-plastic combinations, dyeing defects will also occur due to acid spitting. In addition, when the metal workpieces are not sufficiently washed with water, problems such as exposed white and blooming are likely to occur. There is an urgent need in this field for a brand-new surface conditioner to solve the above-mentioned dyeing problems and at the same time extend the service life of dyes. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies of the prior art and provide an anodic oxidation dyeing surface conditioner. The surface conditioner includes a first component and a second component. The first component is composed of 100 parts by weight of sulfamic acid, 40 - 60 parts by weight of sodium benzoate, 30 - 50 parts by weight of sodium acetate, and 10 - 20 parts by weight of sodium carbonate. The second component is an aqueous solution of quaternary ammonium salt at a concentration of 0.001 - 0.1 g / L.

[0005] The concentration of sulfamic acid in the bath solution of the surface conditioner is 30 - 70 g / L, and the pH value at 25 °C is 1.8 - 2.5.

[0006] The quaternary ammonium salt is selected from one or more of tetraethyl quaternary ammonium salt, tetrapropyl quaternary ammonium salt, tetrabutyl quaternary ammonium salt, and tetramethyl quaternary ammonium salt.

[0007] A method for using a surface conditioner includes the following steps:

[0008] The anodized metal workpiece is ultrasonically treated in the first component of the surface conditioner for 30 s - 10 min, and then washed clean with water;

[0009] The metal workpiece washed clean with water is ultrasonically treated in the first component of the surface conditioner for 30 s - 10 min, and then washed clean with water and subjected to dyeing treatment;

[0010] The first component is composed of 100 parts by weight of sulfamic acid, 40 - 60 parts by weight of sodium benzoate, 30 - 50 parts by weight of sodium acetate, and 10 - 20 parts by weight of sodium carbonate. The second component is an aqueous solution of quaternary ammonium salt at a concentration of 0.001 - 0.1 g / L.

[0011] The concentration of sulfamic acid of the surface conditioner in the bath solution is 30 - 70 g / L, and the pH value at 25 °C is 1.8 - 2.5.

[0012] The quaternary ammonium salt is selected from one or more of tetraethyl quaternary ammonium salt, tetrapropyl quaternary ammonium salt, tetrabutyl quaternary ammonium salt, and tetramethyl quaternary ammonium salt.

[0013] The preparation method of the first component of the surface conditioner is as follows: fully dissolve the first component of the surface conditioner with hot water at 70 - 90 °C, then filter impurities, and pour it into the bath solution so that the concentration of sulfamic acid in the bath solution is 30 - 70 g / L, and the pH value at 25 °C is 1.8 - 2.5.

[0014] The measurement steps of the sulfamic acid concentration are as follows:

[0015] Dilute the sample by n times;

[0016] Use a spectrophotometer to measure the absorbance AS of the diluted solution, measurement wavelength: 261 nm, reference solution: pure water;

[0017] Concentration calculation: HL - B122G (g / L) = 0.149 * AS * n;

[0018] AS - Absorbance at 261 nm;

[0019] n - Dilution factor.

[0020] The surface conditioner of the present invention is an acidic white - light yellow powder. It is specifically used for the pretreatment before dyeing after anodizing, and can effectively prevent poor dyeing caused by acid vomiting of complex parts such as blind holes, threaded holes, and aluminum - plastic combinations; avoid problems such as white spots and blooming caused by insufficient water washing, reduce the introduction of oxidation solution and other impurities, and extend the service life of dyes. It has excellent effects on dyes for die - cast aluminum with loose surfaces.

[0021] Experiments have proved that sulfamic acid has a better surface conditioning effect compared with other acids, but sulfamic acid has strong acidity and there is a situation of corrosion of the oxide film. In the process of the present invention, the poor dyeing caused by acid vomiting is due to substances such as sulfuric acid in the pores. The present invention adopts the method of acid replacement with sulfamic acid to replace the sulfuric acid in the pores, but the sulfamic acid present in the pores will still cause slight corrosion to the oxide film, especially after long - term immersion. The present invention adopts a low - concentration quaternary ammonium salt, which can effectively replace sulfamic acid, reduce the disadvantages of sulfamic acid, and also reduce the oxidation solution, effectively ensuring subsequent dyeing and improving the service life of dyeing dyes.

[0022] Referring to the following detailed description, it is easier to understand the above - mentioned and other features, aspects, and advantages of the present application. Detailed implementation mode

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0024] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which the present invention pertains. The "first", "second" and similar terms used in the specification and claims of this patent application of the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "one" do not denote a quantity limitation, but mean that there is at least one.

[0025] An anodic oxidation dyeing surface conditioner, the surface conditioner comprising a first component and a second component, the first component consisting of 100 parts by weight of sulfamic acid, 40 - 60 parts by weight of sodium benzoate, 30 - 50 parts by weight of sodium acetate and 10 - 20 parts by weight of sodium carbonate, and the second component being an aqueous solution of quaternary ammonium salt at 0.001 - 0.1 g / L.

[0026] The concentration of sulfamic acid of the surface conditioner in the bath solution is 30 - 70 g / L, and the pH value at 25 °C is 1.8 - 2.5.

[0027] The quaternary ammonium salt is selected from one or more of tetraethyl quaternary ammonium salt, tetrapropyl quaternary ammonium salt, tetrabutyl quaternary ammonium salt, and tetramethyl quaternary ammonium salt.

[0028] When starting up the bath or making up, do not directly pour the surface conditioner into the water tank. It should be fully dissolved in other containers with hot water (about 80 °C) and then added to the bath. If necessary, it can be filtered through a filter screen to ensure that the surface conditioner is fully dissolved and avoid the generation of suspended solid particles, which may affect the subsequent dyeing quality.

[0029] Long - term immersion will slightly corrode the oxide film. To improve the solubility of the bath solution, stirring can be carried out, and foam will be generated. Using it in combination with ultrasonic waves has a better effect.

[0030] When starting up the bath (50 g / L), the pH value is about 2.0. The pH should be adjusted regularly when the pH changes due to the carry - out of acid and alkali.

[0031] As the bath solution is used, the solution will gradually turn brown, but it does not affect the product performance.

[0032] This product is prone to absorbing water and caking, which is a normal phenomenon and has no impact on the product performance. Store it sealed and use it as soon as possible after opening.

[0033] Example 1

[0034] The surface conditioner includes a first component and a second component. The first component consists of 100 parts by weight of sulfamic acid, 50 parts by weight of sodium benzoate, 40 parts by weight of sodium acetate, and 16 parts by weight of sodium carbonate. The second component is an aqueous solution of quaternary ammonium salt at 0.003 g / L. The operating temperature is normal temperature, and an ultrasonic device is used for auxiliary treatment. The ultrasonic frequency is 24 kHz, and the operating time is 30 s. First, sulfamic acid replacement is carried out, and then quaternary ammonium salt replacement is carried out. After each process, water washing is required to avoid contamination of the next process by the liquid medicine. The die-cast aluminum workpieces are processed, and the specific process is as follows:

[0035] Pretreatment → Anodic oxidation → Surface conditioning → Dyeing → Sealing (intermediate water washing is omitted).

[0036] It is found by comparison that the workpiece surface colored by the present invention using quaternary ammonium salt replacement is more uniform.

[0037] The foregoing shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

[0038] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for using a surface conditioner, characterized in that, The surface conditioner includes a first component and a second component. The first component is composed of 100 parts by weight of sulfamic acid, 40 - 60 parts by weight of sodium benzoate, 30 - 50 parts by weight of sodium acetate, and 10 - 20 parts by weight of sodium carbonate. The second component is an aqueous solution of quaternary ammonium salt with a concentration of 0.001 - 0.1 g / L. The usage method includes the following steps: first, perform sulfamic acid replacement, then perform quaternary ammonium salt replacement, and then wash it clean with water and perform dyeing treatment. After each process, it is necessary to wash with water to avoid contamination of the next process by the liquid medicine. Specifically: Place the anodized metal workpiece in the first component of the surface conditioner and perform ultrasonic treatment for 30 s - 10 min, and then wash it clean with water; place the metal workpiece washed clean with water in the second component of the surface conditioner and perform ultrasonic treatment for 30 s - 10 min.

2. The method for using a surface conditioner according to claim 1, characterized in that, The concentration of sulfamic acid in the bath solution of the surface conditioner is 30 - 70 g / L, and the pH value at 25 °C is 1.8 - 2.

5.

3. The method for using a surface conditioner according to claim 1, characterized in that, The quaternary ammonium salt is selected from one or more of tetraethyl quaternary ammonium salt, tetrapropyl quaternary ammonium salt, tetrabutyl quaternary ammonium salt, and tetramethyl quaternary ammonium salt.

4. The method for using a surface conditioner according to claim 1, characterized in that, The preparation method of the first component of the surface conditioner is as follows: fully dissolve the first component of the surface conditioner with hot water at 70 - 90 °C, then filter out impurities, and pour it into the bath solution so that the concentration of sulfamic acid in the bath solution is 30 - 70 g / L, and the pH value at 25 °C is 1.8 - 2.

5.

5. The method for using a surface conditioner according to claim 4, characterized in that, The measurement steps of the sulfamic acid concentration are as follows: Dilute the sample by n times; Use a spectrophotometer to measure the absorbance AS of the diluted solution, measurement wavelength: 261 nm, reference solution: pure water; Concentration calculation: HL - B122G (g / L)=0.149 * AS * n; AS - absorbance at 261 nm; n - dilution factor.