A black aluminum profile electrolytic coloring additive and coloring process thereof

Abstract

The invention belongs to the technical field of material surface treatment, and discloses a black aluminum profile electrolytic coloring additive and a coloring process thereof. The black aluminum profile electrolytic coloring additive of the present invention comprises a main coloring salt, a coloring auxiliary salt, a dispersant, a complexing agent, a conductive salt and a penetrant; the main coloring salt is selected from copper sulfate, the coloring auxiliary salt is selected from ferrous sulfate and / or manganese sulfate, and the complexing agent comprises an organic phosphonic acid compound. The black aluminum profile electrolytic coloring additive of the present invention uses copper sulfate as the main coloring salt, ferrous sulfate and / or manganese sulfate as the coloring auxiliary salt, can replace traditional nickel-tin salts, has low cost, is environmentally friendly, has good stability, and can accelerate the electrolytic coloring reaction speed and shorten the time required for electrolytic black coloring. It only takes 6-8 minutes to color black, which is significantly better than the traditional stannous sulfate and nickel sulfate coloring time (more than 12 minutes).

Description

Technical Field

[0001] The invention belongs to the technical field of material surface treatment, and particularly relates to a black aluminum profile electrolytic coloring additive and a coloring process thereof. Background Art

[0002] The electrolytic coloring additives used in the traditional electrolytic blackening process of aluminum profiles mainly include a mixture of nickel salts and tin salts, single nickel salts or single tin salts, which have the following problems: 1. The electrolytic coloring bath containing tin salts has poor stability and is easily turbid, because the divalent stannous ions themselves are easily oxidized into tetravalent tin by air, which affects the coloring uniformity. At the same time, the cost of stannous sulfate is relatively high; 2. The oxide film required for the electrolytic blackening of a mixture of nickel salts and tin salts is relatively thick, generally requiring a thickness of more than 12μm, and the electrolytic blackening efficiency is low, generally requiring coloring for more than 12 minutes. Due to the long coloring time, a layer of yellow ash is easily generated on the surface of the aluminum profile during the coloring process, affecting the product quality. The electrolytic blackening time of single nickel salts or single tin salts is longer; 3. Nickel salts, as heavy metals, are not environmentally friendly and have been banned or restricted in this field. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention provides a black aluminum profile electrolytic coloring additive, which is low in cost, environmentally friendly, can improve the electrolytic coloring efficiency of aluminum profiles, and the color after electrolytic coloring is uniform and stable, and the black effect reaches the effect of traditional nickel-tin salt electrolytic black coloring.

[0004] The first aspect of the present invention provides a black aluminum profile electrolytic coloring additive, comprising a main coloring salt, an auxiliary coloring salt, a dispersant, a complexing agent, a conductive salt and a penetrant; the main coloring salt is selected from copper sulfate, the auxiliary coloring salt is selected from ferrous sulfate and / or manganese sulfate, and the complexing agent includes an organic phosphonic acid compound.

[0005] Preferably, based on the mass proportions, the composition includes 15-25 parts of main coloring salt, 5-10 parts of auxiliary coloring salt, 0.1-0.5 parts of dispersant, 4-6 parts of complexing agent, 1-3 parts of conductive salt and 0.1-0.3 parts of penetrant.

[0006] Preferably, based on the mass parts, it includes 15 parts of main coloring salt, 5 parts of auxiliary coloring salt, 0.1 parts of dispersant, 4 parts of complexing agent, 2 parts of conductive salt and 0.1 parts of penetrant.

[0007] Preferably, the dispersant includes at least one of polyethylene glycol-10000, polyethylene glycol-6000, and polyethylene glycol-400. The dispersant used in the present invention can make the color dispersion good during electrolytic coloring, and the color distribution always remains uniform.

[0008] Preferably, the organic phosphonic acid compound comprises at least one of diethylene triamine penta methylene phosphonic acid, diethylene triamine penta methylene phosphonic acid sodium, ethylene diamine tetra methylene phosphonic acid, and ethylene diamine tetra methylene phosphonic acid sodium. The organic phosphonic acid compound used in the present invention has a good complexation to copper ion, so that copper ion can be better deposited in the depth of the oxide film hole, and copper ion is deposited more firmly in the oxide film hole, and it can be avoided that when subsequent treatment (such as sealing or electrophoresis) occurs, part of the copper ion is easily soaked out from the shallow layer of the film hole, and the traditional copper sulfate is mainly salt, and the coloring is easily faded, and the color becomes lighter. In addition, the organic phosphonic acid compound can coordinate with copper, iron, and manganese metal ions, accelerate the deposition of metal ions in the oxide film hole, thereby accelerating the electrolytic coloring reaction speed, shortening the time required for electrolytic coloring, and the present invention only needs 6-8min to be able to color black, which is significantly better than the time (more than 12min) of traditional stannous sulfate and nickel sulfate coloring.

[0009] Preferably, at least one of a buffer and an antiscalant is also included.

[0010] Preferably, a buffer and an antiscalant are also included.

[0011] Preferably, the conductive salt includes at least one of magnesium sulfate, aluminum sulfate and ammonium thiosulfate. The conductive salt used in the present invention can reduce the resistance of the electrolytic coloring bath solution, improve the metal ion distribution capacity, and further make the surface of the aluminum profile uniformly black.

[0012] Preferably, the penetrant includes at least one of OEP-70, fatty alcohol polyoxyethylene ether, and Triton X-100. The penetrant used in the present invention has a strong wetting and dispersing ability, which can help to quickly introduce metal ions (divalent cupric ions, divalent ferrous ions, divalent manganese ions) into the deep part of the oxide film pores and evenly distribute them, so that the surface after coloring is uniformly black and bright in color, and is not easy to fade in the subsequent process, and the black surface and the base color remain stable and consistent for a long time.

[0013] Preferably, the complexing agent also includes at least one of tetrahydroxypropylethylenediamine, 5-sulfosalicylic acid, L-tartaric acid, EDTA tetrasodium, and trisodium citrate. These complexing agents used in the present invention are effective complexing agents for divalent cupric ion, ferrous ion, and divalent manganese ion, respectively, and can maintain the long-term stability of the electrolytic coloring bath solution, making the bath solution easier to maintain.

[0014] Preferably, the buffer comprises at least one of boric acid, ammonium dihydrogen phosphate and sodium dihydrogen phosphate. The buffer used in the present invention can play the role of pH buffer in the electrolytic coloring bath, and can also make the electrolytic coloring more evenly distributed, especially for the electrolytic black coloring of aluminum profiles with grooves, which can avoid the defect of the overall surface color inconsistency caused by the lighter color of the grooves after black coloring.

[0015] Preferably, the scale inhibitor is selected from AA / AMPS / HPA terpolymer. The AA / AMPS / HPA terpolymer used in the present invention has excellent scale inhibition performance, can avoid the problems of dirt, sediment, turbidity, etc. in the electrolytic coloring tank liquid after long-term use, so that the electrolytic coloring tank liquid can also remain clear and transparent after long-term use, and there is no need to clean the tank and empty the tank for 1-2 years of continuous production and operation, and no slagging, precipitation, etc. will occur at the bottom of the tank. The tank liquid always remains clear and transparent, and the coloring production is long-term, stable and normal, and does not need to be easy to become turbid like traditional nickel-tin salt, single tin salt, single nickel salt coloring tank liquid, and generally after 3-6 months, it is necessary to use polyacrylamide flocculants for regular tank settling and emptying.

[0016] A second aspect of the present invention provides a black aluminum profile electrolytic coloring process, comprising the following steps:

[0017] Anodizing the aluminum profile to form an oxide film with a thickness of not less than 8 μm on the surface of the aluminum profile;

[0018] The aluminum profile after anodizing is subjected to electrolytic coloring to obtain a black aluminum profile;

[0019] The electrolytic coloring treatment uses a bath solution comprising the black aluminum profile electrolytic coloring additive according to any one of claims 1 to 7;

[0020] The time of the electrolytic coloring treatment is 6-8min.

[0021] Preferably, the concentration of the black aluminum profile electrolytic coloring additive is 50-100 g / L.

[0022] Preferably, before the aluminum profile is anodized, a pretreatment is also included: the aluminum profile is degreased and washed with water.

[0023] Preferably, the temperature of the anodizing treatment is 18-22° C. and the voltage is 14-16V.

[0024] Preferably, the oxide film has a thickness of 8-12 μm.

[0025] Preferably, the temperature of the electrolytic coloring treatment is 20-25°C and the voltage is 14-17V.

[0026] Preferably, the bath solution also includes free sulfuric acid.

[0027] Preferably, the concentration of free sulfuric acid is 12-18 g / L.

[0028] Preferably, after the electrolytic coloring treatment, a sealing treatment is also included.

[0029] Preferably, the sealing treatment adopts medium-temperature sealing treatment, and the pH of the medium-temperature sealing treatment is 5.5-6.0, the temperature is 65-70° C., and the time is 8-12 minutes.

[0030] Preferably, after the sealing treatment, electrophoresis treatment is also included.

[0031] A third aspect of the present invention provides a black aluminum profile, which is electrolytically colored using the black aluminum profile electrolytic coloring process described in the present invention.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] The electrolytic coloring additive for black aluminum profiles of the present invention uses copper sulfate as a main coloring salt and ferrous sulfate and / or manganese sulfate as auxiliary coloring salts, and can replace traditional nickel-tin salts. The additive has low cost, is environmentally friendly, and has good stability. Unlike traditional stannous sulfate electrolytic black coloring, it does not require many types of organic stabilizing additives, so that the organic components in the electrolytic coloring bath liquid of the present invention are relatively simple and easy to maintain. At the same time, the conductive salt is used to enhance the conductivity of the electrolytic coloring bath liquid, and the main coloring salt and the auxiliary coloring salt are introduced into the deep layer of the oxide film pores by using a penetrant. The dispersant is used to uniformly disperse the metal ions of the main coloring salt and the auxiliary coloring salt in the oxide film pores to achieve coloring uniformity. Finally, the organic phosphonic acid compound accelerates the deposition of metal ions in the oxide film pores, thereby accelerating the electrolytic coloring reaction speed and shortening the time required for electrolytic black coloring. The electrolytic black coloring can be achieved in only 6-8 minutes, which is significantly better than the traditional stannous sulfate and nickel sulfate coloring time (more than 12 minutes).

[0034] The ferrous sulfate and / or manganese sulfate in the electrolytic coloring additive for black aluminum profiles of the present invention can assist in filling the gaps of divalent copper ions with divalent ferrous ions and divalent manganese ions during the electrolytic coloring process, and play a covering role, thereby avoiding the problem of fading, color lightening, and unstable coloring caused by coloring with copper sulfate as the main salt.

[0035] The electrolytic coloring efficiency of aluminum profiles can be significantly improved by using the black aluminum profile electrolytic coloring additive of the present invention to electrolytically color aluminum profiles. By forming an oxide film with a thickness of not less than 8 μm on the surface of the aluminum profile and electrolytic coloring for 6-8 minutes, a black aluminum profile with a smooth black surface, good color, clear base color, and good true black surface effect can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a comparison chart of the products prepared in Example 1 and Comparative Examples 1-3. DETAILED DESCRIPTION

[0037] In order to make the technical scheme of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

[0038] Unless otherwise specified, the raw materials, reagents and devices used in the following examples can be obtained from conventional commercial sources or by existing known methods.

[0039] Example 1

[0040] A black aluminum profile electrolytic coloring additive, comprising the following components in parts by mass:

[0041] 15 parts of copper sulfate, 5 parts of ferrous sulfate, 2 parts of magnesium sulfate, 5 parts of tetrahydroxypropylethylenediamine, 1 part of boric acid, 2 parts of 5-sulfosalicylic acid, 0.1 parts of polyethylene glycol-10000, 2 parts of diethylenetriamine penta (methylene phosphonic acid), 2 parts of sodium ethylenediaminetetra (methylene phosphonate), 4 parts of AA / AMPS / HPA terpolymer, 0.1 parts of OEP-70, and 61.8 parts of deionized water.

[0042] The preparation method of the black aluminum profile electrolytic coloring additive of this embodiment is: mix the components and stir them evenly.

[0043] The components of the black electrolytic coloring bath liquid are as follows: 50 g / L of the black aluminum profile electrolytic coloring additive of the present embodiment, 12 g / L of free sulfuric acid, and the remainder is deionized water.

[0044] A black aluminum profile electrolytic coloring process comprises the following steps:

[0045] Perform conventional pretreatment on the aluminum profiles: degreasing and water washing;

[0046] The pretreated aluminum profile is anodized at a temperature of 18°C ​​and a voltage of 14V to form an oxide film with a thickness of 8 μm on the surface of the aluminum profile;

[0047] The aluminum profile after anodizing treatment is immersed in the black electrolytic coloring bath solution of this embodiment for electrolytic coloring treatment, and the temperature of the electrolytic coloring treatment is 20° C., the voltage is 14V, and the time is 6 minutes;

[0048] The aluminum profile after the electrolytic coloring treatment is subjected to a medium-temperature sealing treatment, wherein the pH value of the medium-temperature sealing treatment is 5.5, the temperature is 65° C., and the time is 8 minutes, thereby obtaining a black aluminum profile.

[0049] The black aluminum profile obtained in this embodiment is as follows Figure 1 As shown in a.

[0050] Example 2

[0051] A black aluminum profile electrolytic coloring additive, comprising the following components in parts by mass:

[0052] 15 parts of copper sulfate, 5 parts of manganese sulfate, 2 parts of aluminum sulfate, 5 parts of tetrahydroxypropylethylenediamine, 1 part of boric acid, 2 parts of L-tartaric acid, 0.1 parts of polyethylene glycol-6000, 6 parts of diethylenetriamine penta (methylene phosphonic acid), 4 parts of AA / AMPS / HPA terpolymer, 0.1 parts of OEP-70, and 59.8 parts of deionized water.

[0053] The preparation method of the black aluminum profile electrolytic coloring additive of this embodiment is: mix the components and stir them evenly.

[0054] The components of the black electrolytic coloring bath liquid are as follows: 80 g / L of the black aluminum profile electrolytic coloring additive of the present embodiment, 15 g / L of free sulfuric acid, and the remainder is deionized water.

[0055] A black aluminum profile electrolytic coloring process comprises the following steps:

[0056] Perform conventional pretreatment on the aluminum profiles: degreasing and water washing;

[0057] The pretreated aluminum profile is anodized at a temperature of 20°C and a voltage of 15V to form an oxide film with a thickness of 10 μm on the surface of the aluminum profile;

[0058] The aluminum profile after anodizing treatment is immersed in the black electrolytic coloring bath solution of this embodiment for electrolytic coloring treatment. The temperature of the electrolytic coloring treatment is 22° C., the voltage is 15V, and the time is 6 minutes;

[0059] The aluminum profile after the electrolytic coloring treatment is subjected to a medium-temperature sealing treatment, wherein the pH value of the medium-temperature sealing treatment is 6.0, the temperature is 70° C., and the time is 10 min, to obtain a black aluminum profile.

[0060] Example 3

[0061] A black aluminum profile electrolytic coloring additive, comprising the following components in parts by mass:

[0062] 15 parts of copper sulfate, 2 parts of ferrous sulfate, 3 parts of manganese sulfate, 2 parts of ammonium thiosulfate, 4 parts of tetrasodium EDTA, 1 part of boric acid, 3 parts of trisodium citrate, 0.1 parts of polyethylene glycol-400, 6 parts of sodium ethylenediaminetetramethylenephosphonate, 4 parts of AA / AMPS / HPA terpolymer, 0.1 parts of OEP-70, and 59.8 parts of deionized water.

[0063] The preparation method of the black aluminum profile electrolytic coloring additive of this embodiment is: mix the components and stir them evenly.

[0064] The components of the black electrolytic coloring bath liquid are as follows: 100 g / L of the black aluminum profile electrolytic coloring additive of the present embodiment, 18 g / L of free sulfuric acid, and the remainder is deionized water.

[0065] A black aluminum profile electrolytic coloring process comprises the following steps:

[0066] Perform conventional pretreatment on the aluminum profiles: degreasing and water washing;

[0067] The pretreated aluminum profile is anodized at a temperature of 22° C. and a voltage of 16 V, and an oxide film with a thickness of 12 μm is formed on the surface of the aluminum profile;

[0068] The aluminum profile after anodizing treatment is immersed in the black electrolytic coloring bath solution of this embodiment for electrolytic coloring treatment, and the temperature of the electrolytic coloring treatment is 25° C., the voltage is 17V, and the time is 8min;

[0069] The aluminum profile after the electrolytic coloring treatment is subjected to a medium-temperature sealing treatment, wherein the pH value of the medium-temperature sealing treatment is 5.5, the temperature is 65° C., and the time is 12 minutes, thereby obtaining a black aluminum profile.

[0070] Comparative Example 1 (using traditional nickel-tin salt electrolytic coloring)

[0071] The components of the black electrolytic coloring bath liquid are: 20 / L nickel sulfate, 10g / L stannous sulfate, 16g / L reagent sulfuric acid, and 20g / L LW-03 tin main salt electrolytic coloring agent. Among them, LW-03 tin main salt electrolytic coloring agent is selected from Foshan Haihua Surface Treatment Technology Co., Ltd., and its main components are boric acid, aluminum sulfate, catechol, tartaric acid, and hydrazine sulfate.

[0072] A black aluminum profile electrolytic coloring process comprises the following steps:

[0073] Perform conventional pretreatment on the aluminum profiles: degreasing and water washing;

[0074] The pretreated aluminum profile is anodized at a temperature of 18°C ​​and a voltage of 14V to form an oxide film with a thickness of 12 μm on the surface of the aluminum profile;

[0075] The aluminum profile after anodizing treatment is immersed in the black electrolytic coloring bath solution of this comparative example for electrolytic coloring treatment, and the electrolytic coloring treatment temperature is 20° C., the voltage is 14V, and the time is 12min;

[0076] The aluminum profile after the electrolytic coloring treatment is subjected to a medium-temperature sealing treatment, wherein the pH value of the medium-temperature sealing treatment is 5.5, the temperature is 65° C., and the time is 8 minutes, thereby obtaining a black aluminum profile.

[0077] The black aluminum profile obtained in this comparative example is Figure 1 As shown in b.

[0078] Comparative Example 2 (the difference from Example 1 is that no dispersant is added)

[0079] A black aluminum profile electrolytic coloring additive, comprising the following components in parts by mass:

[0080] 15 parts of copper sulfate, 5 parts of ferrous sulfate, 2 parts of magnesium sulfate, 5 parts of tetrahydroxypropylethylenediamine, 1 part of boric acid, 2 parts of 5-sulfosalicylic acid, 2 parts of diethylenetriaminepenta(methylenephosphonic acid), 2 parts of sodium ethylenediaminetetra(methylenephosphonic acid), 4 parts of AA / AMPS / HPA terpolymer, 0.1 parts of OEP-70, and 61.9 parts of deionized water.

[0081] The preparation method of the black aluminum profile electrolytic coloring additive of this comparative example is: mix the components and stir them evenly.

[0082] The components of the black electrolytic coloring bath liquid are as follows: 50 g / L of the black aluminum profile electrolytic coloring additive of this comparative example, 12 g / L of free sulfuric acid, and the balance is deionized water.

[0083] A black aluminum profile electrolytic coloring process comprises the following steps:

[0084] Perform conventional pretreatment on the aluminum profiles: degreasing and water washing;

[0085] The pretreated aluminum profile is anodized at a temperature of 18°C ​​and a voltage of 14V to form an oxide film with a thickness of 8 μm on the surface of the aluminum profile;

[0086] The aluminum profile after anodizing treatment is subjected to electrolytic coloring treatment, and the temperature of electrolytic coloring treatment is 20°C, the voltage is 14V, and the time is 6min;

[0087] The aluminum profile after the electrolytic coloring treatment is subjected to a medium-temperature sealing treatment, wherein the pH value of the medium-temperature sealing treatment is 5.5, the temperature is 65° C., and the time is 8 minutes, thereby obtaining a black aluminum profile.

[0088] The black aluminum profile obtained in this comparative example is Figure 1 As shown in c.

[0089] Comparative Example 3 (the difference from Example 1 is that no organic phosphonic acid compound is added)

[0090] A black aluminum profile electrolytic coloring additive, comprising the following components in parts by mass:

[0091] 15 parts of copper sulfate, 5 parts of ferrous sulfate, 2 parts of magnesium sulfate, 5 parts of tetrahydroxypropylethylenediamine, 1 part of boric acid, 2 parts of 5-sulfosalicylic acid, 0.1 parts of polyethylene glycol-10000, 4 parts of AA / AMPS / HPA terpolymer, 0.1 parts of OEP-70, and 65.8 parts of deionized water.

[0092] The preparation method of the black aluminum profile electrolytic coloring additive of this comparative example is: mix the components and stir them evenly.

[0093] The components of the black electrolytic coloring bath liquid are as follows: 50 g / L of the black aluminum profile electrolytic coloring additive of this comparative example, 12 g / L of free sulfuric acid, and the balance is deionized water.

[0094] A black aluminum profile electrolytic coloring process comprises the following steps:

[0095] Perform conventional pretreatment on the aluminum profiles: degreasing and water washing;

[0096] The pretreated aluminum profile is anodized at a temperature of 18°C ​​and a voltage of 14V to form an oxide film with a thickness of 8 μm on the surface of the aluminum profile;

[0097] The aluminum profile after anodizing treatment is immersed in the black electrolytic coloring bath solution of this comparative example for electrolytic coloring treatment, and the electrolytic coloring treatment temperature is 20° C., the voltage is 14V, and the time is 6 minutes;

[0098] The aluminum profile after the electrolytic coloring treatment is subjected to a medium-temperature sealing treatment, wherein the pH value of the medium-temperature sealing treatment is 5.5, the temperature is 65° C., and the time is 8 minutes, thereby obtaining a black aluminum profile.

[0099] The black aluminum profile obtained in this comparative example is Figure 1 As shown in d.

[0100] from Figure 1 It can be seen that the aluminum profile of Example 1 can be colored black after 6 minutes of electrolytic coloring. Its surface is beautifully black, the color uniformity is good, it is true black, the base color is bluish, and the black effect ( Figure 1 a) is basically equivalent to the black effect obtained by coloring for 12 minutes by the conventional nickel-tin salt electrolytic coloring process in Comparative Example 1 ( Figure 1 b); Comparative Example 2: Due to the absence of dispersant, the surface of the aluminum profile is obviously unevenly black, with obvious light-colored marks on the surface, and the overall effect of electrolytic black is not ideal ( Figure 1 c); Comparative Example 3 Since no organic phosphonic acid compound is added, the surface of the aluminum profile has a relatively uniform color, but the black is lighter ( Figure 1d), even if the coloring time is extended to 12 minutes, the black effect cannot reach the black effect of Example 1, and the overall effect of electrolytic blackening is not ideal.

[0101] In addition, Examples 2 and 3 of the present invention also achieved good comprehensive electrolytic black coloring effects and good color uniformity.

[0102] Comparative Example 4 (the difference from Example 1 is that ferrous sulfate is replaced by potassium antimony tartrate)

[0103] A black aluminum profile electrolytic coloring additive, comprising the following components in parts by mass:

[0104] 15 parts of copper sulfate, 5 parts of potassium antimony tartrate, 2 parts of magnesium sulfate, 5 parts of tetrahydroxypropylethylenediamine, 1 part of boric acid, 2 parts of 5-sulfosalicylic acid, 0.1 parts of polyethylene glycol-10000, 2 parts of diethylenetriamine penta (methylene phosphonic acid), 2 parts of sodium ethylenediaminetetra (methylene phosphonic acid), 4 parts of AA / AMPS / HPA terpolymer, 0.1 parts of OEP-70, and 61.8 parts of deionized water.

[0105] The preparation method of the black aluminum profile electrolytic coloring additive of this comparative example is: mix the components and stir them evenly.

[0106] The components of the black electrolytic coloring bath liquid are as follows: 50 g / L of the black aluminum profile electrolytic coloring additive of this comparative example, 12 g / L of free sulfuric acid, and the balance is deionized water.

[0107] A black aluminum profile electrolytic coloring process comprises the following steps:

[0108] Perform conventional pretreatment on the aluminum profiles: degreasing and water washing;

[0109] The pretreated aluminum profile is anodized at a temperature of 18°C ​​and a voltage of 14V to form an oxide film with a thickness of 8 μm on the surface of the aluminum profile;

[0110] The aluminum profile after anodizing treatment is immersed in the black electrolytic coloring bath solution of this comparative example for electrolytic coloring treatment, and the electrolytic coloring treatment temperature is 20° C., the voltage is 14V, and the time is 6 minutes;

[0111] The aluminum profile after the electrolytic coloring treatment is subjected to a medium-temperature sealing treatment, wherein the pH value of the medium-temperature sealing treatment is 5.5, the temperature is 65° C., and the time is 8 minutes, thereby obtaining a black aluminum profile.

[0112] The black aluminum profiles of Example 1 and Comparative Example 4 were respectively subjected to UV resistance tests. The black aluminum profile of Example 1 did not change color after 300 hours, while the black aluminum profile of Comparative Example 4 had obvious color change after 260 hours, indicating that the coloring auxiliary salt used in the present invention can improve the coloring stability.

[0113] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A black aluminum profile electrolytic coloring additive, characterized in that: According to the mass percentage, it includes 15-25 parts of main coloring salt, 5-10 parts of auxiliary coloring salt, 0.1-0.5 parts of dispersant, 4-6 parts of complexing agent, 1-3 parts of conductive salt and 0.1-0.3 parts of penetrant; the main coloring salt is selected from copper sulfate, the auxiliary coloring salt is selected from ferrous sulfate and / or manganese sulfate, and the complexing agent includes an organic phosphonic acid compound; The dispersant includes at least one of polyethylene glycol-10000, polyethylene glycol-6000, and polyethylene glycol-400; The organic phosphonic acid compound includes at least one of diethylene triamine penta methylene phosphonic acid, diethylene triamine penta methylene phosphonic acid sodium, ethylene diamine tetra methylene phosphonic acid, and ethylene diamine tetra methylene phosphonic acid sodium; The conductive salt includes at least one of magnesium sulfate, aluminum sulfate, and ammonium thiosulfate; The penetrant includes at least one of OEP-70, fatty alcohol polyoxyethylene ether, and Triton X-100.

2. The black aluminum profile electrolytic coloring additive according to claim 1, characterized in that: It also includes at least one of a buffer and an antiscalant.

3. The black aluminum profile electrolytic coloring additive according to claim 1, characterized in that: The complexing agent also includes at least one of tetrahydroxypropylethylenediamine, 5-sulfosalicylic acid, L-tartaric acid, tetrasodium EDTA, and trisodium citrate.

4. A black aluminum profile electrolytic coloring process, characterized in that: The steps include: Anodizing the aluminum profile to form an oxide film with a thickness of not less than 8 μm on the surface of the aluminum profile; The aluminum profile after anodizing is subjected to electrolytic coloring to obtain a black aluminum profile; The electrolytic coloring treatment uses a bath solution comprising the black aluminum profile electrolytic coloring additive according to any one of claims 1 to 3; The time of the electrolytic coloring treatment is 6-8min.

5. The black aluminum profile electrolytic coloring process according to claim 4, characterized in that: The concentration of the black aluminum profile electrolytic coloring additive is 50-100 g / L.

6. A black aluminum profile, characterized in that: The black aluminum profile is electrolytically colored using the black aluminum profile electrolytic coloring process described in claim 4 or 5.

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