CN110804754A - Aluminum highlight mobile phone middle frame surface anodic oxide film release agent and release method thereof - Google Patents
Aluminum highlight mobile phone middle frame surface anodic oxide film release agent and release method thereof Download PDFInfo
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
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Abstract
The invention provides an aluminum highlight mobile phone middle frame surface anodic oxide film remover and a removing method thereof, wherein the remover comprises the following components in parts by mass: 1-10 parts of inorganic base; 1-10 parts of a complexing agent; 1-10 parts of a penetrating agent; 0.1 to 1 portion of brightener. The demolding method comprises the steps of S1) degreasing and deoiling treatment; s2), removing the anodic oxide film; s3), neutralization and ash removal; s4) drying process. The invention not only can rapidly remove the oxide film on the surface of the product, but also does not damage the surface of the product; the advantages of no damage to the high-brightness surface, no corrosion to the surface of the aluminum alloy due to excessive reaction and qualified air tightness test of enterprise production on size requirements are achieved after the demoulding treatment. The mold release agent does not contain chromate, fluoride, nitrate, phosphate and other agents which pollute the environment, completely meets the requirement of environmental protection, and the waste liquid can be discharged after being simply neutralized.
Description
Technical Field
The invention relates to the technical field of demoulding of electronic products, in particular to an anodic oxide film stripping agent for the surface of an aluminum highlight mobile phone middle frame and a stripping method thereof.
Background
At present, aluminum alloy is a non-ferrous metal structural material which is most widely applied in industry, and is widely applied in aviation, aerospace, automobile, mechanical manufacturing, ships and chemical industry. Among them, especially, the seven-series aluminum alloy is widely applied to aircraft parts, missile parts, truck and ship parts and other devices requiring strength, and in recent years, the seven-series aluminum alloy is continuously applied to the 3C electronic industry in large quantities, and most electronic enterprises select the seven-series aluminum alloy as the intelligent electronic parts.
The acid film remover of a phosphomolybdate system developed by researchers is not only long in time but also high in temperature and can influence the highlight surface of the seven-system highlight aluminum alloy, and the phosphate protective film generated after the film remover can enable the highlight aluminum alloy surface to participate in reaction, and can obviously see the bright pits of dense hemp on the highlight surface after the anodic oxidation treatment, so that the rework operation cannot be met.
The traditional alkaline-system mold release agent has the effect on five-series or partial six-series products with low requirements, but in recent years, large electronic product manufacturers select seven-series aluminum alloy, so that the surface of the traditional alkaline-system mold release agent is seriously corroded when an oxide film on the surface of the seven-series aluminum alloy is removed, and if the seven-series high-light aluminum alloy is corroded to a high-light surface, the surface of the aluminum alloy is also seriously corroded; and the traditional alkaline system release agent has large biting amount on the surface of the base material, and can not meet the air tightness test requirement of production.
Therefore, the development of the seven-series aluminum highlight mobile phone middle frame surface anodic oxide film remover and the treatment method are a very urgent task aiming at solving the problems, and have profound significance for environmental protection and enterprise production cost saving.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the aluminum highlight mobile phone middle frame surface anodic oxide film remover and the film removing method thereof.
The technical scheme of the invention is as follows: an aluminum highlight mobile phone middle frame surface anodic oxide film remover comprises the following components in parts by mass:
1-10 parts of inorganic base;
1-10 parts of a complexing agent;
1-10 parts of a penetrating agent;
0.1 to 1 portion of brightener.
Preferably, the inorganic base is at least one of sodium hydroxide and potassium hydroxide.
Preferably, the complexing agent comprises at least one of sodium thiosulfate, sodium benzenesulfonate, sodium oxalate, phytate, sodium gluconate, sodium citrate, disodium ethylenediaminetetraacetate (EDTA-2Na), trisodium nitrilotriacetate, and metal tartrate and sodium alginate.
Preferably, the penetrating agent comprises at least one of hydrogen peroxide, polyethylene glycol, polypropylene glycol, ethylene glycol, glycerol, ethylene glycol monobutyl ether, diethylene glycol butyl ether, hydroxybenzene derivatives and hydrazine hydrate.
Preferably, the brightening agent comprises at least one of glucose, agar, sodium stannate, sodium metaaluminate, sodium silicate, triethanolamine, sodium polydithio dipropyl sulfonate, urea, 2-mercaptobenzimidazole, benzimidazole, ethylene thiourea, hydroxyethylidene diphosphonic acid, benzotriazole, sodium tungstate, sodium oleate, octohydroxyquinoline, octadecylamine, gelatin, dextrin, zinc oxide, tragacanth, sodium molybdate, sodium benzoate and 2-mercaptobenzothiazole.
The invention also provides a stripping method of the anodic oxide film on the surface of the middle frame of the aluminum highlight mobile phone, which comprises the following steps:
s1), putting the mobile phone middle frame into a degreasing agent for degreasing and deoiling;
s2), putting the product subjected to grease removal in the step S1) into a mold release agent for removing an anodic oxide film;
s3), putting the product subjected to the demoulding treatment in the step S2) into a neutralizer for neutralization and ash removal treatment;
s4) drying the product processed in the step S3).
Preferably, the countercurrent washing operation is performed on the product before the drying treatment after the degreasing and deoiling treatment of the mobile phone middle frame in the step S1), before and after the demolding treatment in the step S2), before and after the neutralization and dedusting treatment in the step S3), wherein the countercurrent washing operation is performed by air stirring.
Preferably, in step S1), the degreasing agent is a mixture of sodium carbonate, disodium edetate, sodium gluconate, alkyl glycoside, and fatty alcohol-polyoxyethylene ether.
Preferably, in the step S1), the temperature for degreasing and deoiling is 55-70 ℃, and the treatment time is 1-3 min.
Preferably, in step S2), the release agent includes the following components in parts by mass:
1-10 parts of inorganic base;
1-10 parts of a complexing agent;
1-10 parts of a penetrating agent;
0.1 to 1 portion of brightener;
wherein, the inorganic alkali is at least one of sodium hydroxide and potassium hydroxide;
the complexing agent comprises at least one of sodium thiosulfate, sodium benzenesulfonate, sodium oxalate, phytate, sodium gluconate, sodium citrate, disodium ethylenediamine tetraacetic acid, trisodium nitrilotriacetate, and metal tartrate and sodium alginate;
the penetrating agent comprises at least one of hydrogen peroxide, polyethylene glycol, polypropylene glycol, ethylene glycol, glycerol, ethylene glycol monobutyl ether, diethylene glycol butyl ether, hydroxybenzene derivatives and hydrazine hydrate;
the brightening agent comprises at least one of glucose, agar, sodium stannate, sodium metaaluminate, sodium silicate, triethanolamine, sodium polydithio dipropyl sulfonate, urea, 2-mercaptobenzimidazole, benzimidazole, ethylene thiourea, hydroxyethylidene diphosphonic acid, benzotriazole, sodium tungstate, sodium oleate, octohydroxyquinoline, octadecylamine, gelatin, dextrin, zinc oxide, tragacanth, sodium molybdate, sodium benzoate and 2-mercaptobenzothiazole.
Preferably, in step S2), the release agent is used under the following conditions during the release treatment of the product:
wherein the pH value is 13-14, the temperature is 30-60 ℃, and the treatment time is 30-180 s.
Preferably, in step S3), the neutralizing agent is a mixture of sulfuric acid, an oxidizing agent and a stain removing agent.
Preferably, in step S3), the neutralizing agent treatment temperature is 25 ℃ to 35 ℃, and the treatment time is 40S to 100S.
Preferably, in the step S4), the drying temperature is 60 ℃ to 80 ℃, and the drying process lasts for 10 min to 25 min.
The invention has the beneficial effects that:
1. the invention not only can rapidly remove the oxide film on the surface of the product, but also does not damage the surface of the product;
2. the release agent provided by the invention does not contain chromate, fluoride, nitrate, phosphate and other agents which pollute the environment, so that the problem of environmental pollution caused by the traditional phosphoric acid, chromic anhydride and ammonium bifluoride systems is solved;
3. compared with the traditional alkaline system mold release agent, the mold release agent provided by the invention has the advantages that the highlight surface is not damaged, the highlight is not lost after the product is subjected to mold release, and the problems of overlarge alloy size bite and excessive corrosion are avoided.
Detailed Description
The following further illustrates embodiments of the invention:
example 1
An aluminum highlight mobile phone middle frame surface anodic oxide film remover comprises the following components in parts by mass:
example 2
An aluminum highlight mobile phone middle frame surface anodic oxide film remover comprises the following components in parts by mass:
example 3
An aluminum highlight mobile phone middle frame surface anodic oxide film remover comprises the following components in parts by mass:
example 4
A stripping method for an anodic oxide film on the surface of an aluminum highlight mobile phone middle frame comprises the following steps:
s1), putting the seven-series aluminum highlight mobile phone middle frame into a degreasing agent for degreasing and deoiling; considering that the surface of a poor product is stained with grease, sweat stain, dust, chalk stain, residual glue and the like in the inspection and storage processes after the anode oxidation treatment of the middle frame of the seven-series aluminum highlight mobile phone, the subsequent stripping treatment is influenced to a certain extent, and a partially-appearing stripped oxide film is not clean, so that the stains need to be removed by degreasing treatment; considering that degreasing and deoiling cannot affect the subsequent removal of an oxidation film and a high bright surface cannot be damaged in the cleaning process, the traditional strong acid and strong base system degreasing agent is not suitable for use; the degreasing agent adopted in the embodiment comprises the following components:
the sodium carbonate and the sodium gluconate are weak in alkalinity, and the disodium ethylene diamine tetraacetate is weak in acidity, so that the neutral degreasing agent, the penetration effect of alkyl glycoside and the cleaning effect of fatty alcohol-polyoxyethylene ether can be obtained by matching the sodium carbonate and the sodium gluconate, and the surface anodic oxide film and the like cannot be adversely affected during degreasing and degreasing.
In order to better perform degreasing and deoiling treatment on the surface of the seven-system aluminum highlight mobile phone middle frame after anodic oxidation, the degreasing and deoiling treatment is performed at the temperature of 55-70 ℃; the treatment lasts for 1-3 minutes, so that the degreasing and oil removing treatment of the surface of the seven-series aluminum highlight mobile phone middle frame after anodic oxidation can be better carried out.
S2), putting the mobile phone middle frame subjected to degreasing and oil removal treatment into the film remover described in the embodiment 1-3 for removing the anodic oxide film;
compared with the traditional aluminum alloy surface anodic oxide film remover of a phosphoric acid, chromic anhydride and ammonium bifluoride system which can cause environmental pollution, and the traditional alkaline system remover can not ensure that the seven-system highlight aluminum alloy surface anodic oxide film is not lost and highlighted after being removed, the problem that the size of the aluminum alloy is too large in undercut amount and over-corroded is solved, the embodiment can quickly remove the anodic oxide film on the surface of the seven-system highlight aluminum mobile phone middle frame, and the highlight surface is not damaged after the film removing treatment, excessive reaction can not cause corrosion to the aluminum alloy surface, and the qualified air tightness test of the size requirement of enterprise production can be met.
In addition, in order to ensure that the highlight luster is not damaged and the surface of the base material is not corroded after the stripping treatment of the anode oxide film stripping agent on the surface of the seven-series aluminum highlight mobile phone middle frame, the oxide film stripping agent is used at the temperature of 30-60 ℃; the treatment lasts for 30-180 seconds, so that the highlight luster is not damaged after the stripping treatment of the anode oxide film stripping agent on the surface of the middle frame of the seven-series aluminum highlight mobile phone, and the surface of the aluminum alloy is not corroded.
S3), placing the seven-series aluminum highlight mobile phone middle frame treated by the mold release agent into a neutralizer for neutralization and ash removal; when an oxide film is removed from a stripping agent of a mobile phone middle frame, related metal components in aluminum alloy and components in the stripping agent react with each other to cause black and gray hanging and ash stain after the oxide film is removed from the surface, so that neutralization and ash removal treatment are needed by using a neutralizing agent, and the environment is polluted by the traditional nitric acid system, so that the neutralizing agent which is safe and environment-friendly is selected for treatment; the neutralizing agent comprises the following components:
sulfuric acid 10 g/L-50 g/L;
oxidant 10-50 g/L;
10 g/L-50 g/L of stain remover;
in order to better perform the neutralization and ash removal treatment, the neutralization and ash removal treatment of the neutralizer is performed at the temperature of 25-35 ℃; the treatment lasts for 40 to 100 seconds, and neutralization and ash removal treatment can be better performed.
S4), drying the seven-system aluminum highlight mobile phone middle frame processed by the neutralizer, wherein the drying treatment is carried out at the temperature of 60-80 ℃ for better drying treatment, and the drying treatment lasts for 10-25 minutes.
In order to reduce the mutual influence of all the procedures in the treatment process for removing the oxidation film from the frame in the seven-series aluminum highlight mobile phone, thereby improving the overall pretreatment effect, the embodiment is that after the degreasing and oil removing treatment, before the treatment of the mold release agent, and after the treatment of the mold release agent; before the neutralization and ash removal treatment and after the neutralization and ash removal treatment; before the drying treatment, the seven-system aluminum highlight mobile phone middle frame is subjected to countercurrent washing operation; the countercurrent washing operation is carried out by stirring air; and (3) carrying out 3-5 times of countercurrent washing at normal temperature, so that the mutual influence of all the procedures in the treatment process for removing the oxide film from the frame in the seven-system aluminum highlight mobile phone can be reduced, and the whole pretreatment effect is improved.
It can be seen from the above examples that when the concentration of sodium hydroxide is low, i.e. 5 g/l to 50 g/l, respectively, the stripping treatment time of the frame of the hepta-aluminum high-gloss mobile phone is moderate, easy to control, and the surface is not corroded after stripping; when the concentration of sodium hydroxide is high, the reaction is too fast, and the surface is easy to corrode. Particularly, when the concentration of the sodium hydroxide is 10-40 g/l, the stripping effect is good, and the stripping time is about 1-4 min.
When the concentration of the complexing agent is high, the surface gloss after the demoulding treatment is kept uniform and consistent, namely the concentration of sodium thiosulfate or sodium benzenesulfonate or sodium oxalate or phytate or sodium gluconate or sodium citrate or disodium ethylene diamine tetraacetate or trisodium nitrilotriacetate or metal tartrate or sodium alginate is respectively 10 g/l to 50 g/l, the demoulding effect is better; when the concentration of the complexing agent is low, the surface gloss of the substrate is reduced. Particularly, the concentration of the complexing agent is 20 g/L-40 g/L respectively, and the stripping effect is better.
When the concentration of the penetrant is low, the penetrant has a proper promoting effect on the removal of the oxide film and ensures the uniform surface gloss, namely, the concentration of hydrogen peroxide, polyethylene glycol, polypropylene glycol, ethylene glycol, glycerol, ethylene glycol monobutyl ether, diethylene glycol butyl ether, hydroxyphenyl derivatives or hydrazine hydrate is respectively 10 g/L to 50 g/L, the removal effect is better; when the concentration of the penetrant is high, the penetrant can corrode the surface of the base material after demoulding, and particularly, the concentration of the penetrant is 20 g/L-40 g/L respectively, so that the demoulding effect is good.
When the brightener is insufficient, the surface gloss after the stripping treatment cannot be guaranteed to be bright and basically not damaged, namely the brightener comprises glucose, agar, sodium stannate, sodium metaaluminate, sodium silicate, triethanolamine, sodium polydithio-dipropanesulfonate, urea, 2-mercaptobenzimidazole, benzimidazole, ethylene thiourea, hydroxy ethylidene diphosphonic acid, benzotriazole, sodium tungstate, sodium oleate, octahydroxyquinoline, octadecylamine, gelatin, dextrin, zinc oxide, tragacanth, sodium molybdate, sodium benzoate or 2-mercaptobenzothiazole, the concentration of the brightener is respectively 1 g/L to 10 g/L, and the stripping effect is better; especially, when the concentration of the brightener is 1 g/L-5 g/L, the stripping effect is better.
In order to better exert the stripping treatment performance of the anode oxide film stripping agent on the surface of the seven-series aluminum highlight mobile phone middle frame, the oxide film stripping agent is used at the temperature of 30-60 ℃ under the condition that the pH value is 13-14, and the treatment time lasts for 30-180 seconds, so that the stripping treatment performance of the anode oxide film stripping agent on the surface of the seven-series aluminum highlight mobile phone middle frame can be better exerted.
The foregoing embodiments and description have been presented only to illustrate the principles and preferred embodiments of the invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as hereinafter claimed.
Claims (10)
1. The surface anodic oxide film stripping agent for the middle frame of the aluminum highlight mobile phone is characterized by comprising the following components in parts by mass:
1-10 parts of inorganic base;
1-10 parts of a complexing agent;
1-10 parts of a penetrating agent;
0.1 to 1 portion of brightener;
wherein, the inorganic alkali is at least one of sodium hydroxide and potassium hydroxide;
the complexing agent comprises at least one of sodium thiosulfate, sodium benzenesulfonate, sodium oxalate, phytate, sodium gluconate, sodium citrate, disodium ethylene diamine tetraacetate (EDTA-2Na), trisodium nitrilotriacetate, and metal tartrate and sodium alginate;
preferably, the penetrating agent comprises at least one of hydrogen peroxide, polyethylene glycol, polypropylene glycol, ethylene glycol, glycerol, ethylene glycol monobutyl ether, diethylene glycol butyl ether, hydroxybenzene derivatives and hydrazine hydrate;
preferably, the brightening agent comprises at least one of glucose, agar, sodium stannate, sodium metaaluminate, sodium silicate, triethanolamine, sodium polydithio dipropyl sulfonate, urea, 2-mercaptobenzimidazole, benzimidazole, ethylene thiourea, hydroxyethylidene diphosphonic acid, benzotriazole, sodium tungstate, sodium oleate, octohydroxyquinoline, octadecylamine, gelatin, dextrin, zinc oxide, tragacanth, sodium molybdate, sodium benzoate and 2-mercaptobenzothiazole.
2. A stripping method for an anodic oxide film on the surface of an aluminum highlight mobile phone middle frame is characterized by comprising the following steps:
s1), putting the mobile phone middle frame into a degreasing agent for degreasing and deoiling;
s2), putting the product subjected to grease removal in the step S1) into a mold release agent for removing an anodic oxide film;
s3), putting the product subjected to the demoulding treatment in the step S2) into a neutralizer for neutralization and ash removal treatment;
s4) drying the product processed in the step S3).
3. The method for stripping the anodic oxide film on the surface of the middle frame of the aluminum highlight mobile phone according to claim 2, wherein: after degreasing and deoiling treatment of the mobile phone middle frame in the step S1), before and after demolding treatment in the step S2), before and after neutralization and dedusting treatment in the step S3), and before drying treatment, the product is required to be subjected to countercurrent washing operation, wherein the countercurrent washing operation is carried out by air stirring.
4. The method for stripping the anodic oxide film on the surface of the middle frame of the aluminum highlight mobile phone according to claim 2, wherein: in the step S1), the degreasing agent is a mixture of sodium carbonate, disodium ethylene diamine tetraacetate, sodium gluconate, alkyl glycoside and fatty alcohol-polyoxyethylene ether.
5. The method for stripping the anodic oxide film on the surface of the middle frame of the aluminum highlight mobile phone according to claim 2, wherein: in the step S1), the temperature for degreasing and deoiling is 55-70 ℃, and the treatment time is 1-3 min.
6. The method for stripping the anodic oxide film on the surface of the middle frame of the aluminum highlight mobile phone according to claim 2, wherein: in the step S2), the release agent comprises the following components in parts by mass:
1-10 parts of inorganic base;
1-10 parts of a complexing agent;
1-10 parts of a penetrating agent;
0.1 to 1 portion of brightener;
wherein, the inorganic alkali is at least one of sodium hydroxide and potassium hydroxide;
the complexing agent comprises at least one of sodium thiosulfate, sodium benzenesulfonate, sodium oxalate, phytate, sodium gluconate, sodium citrate, disodium ethylenediamine tetraacetic acid, trisodium nitrilotriacetate, and metal tartrate and sodium alginate;
the penetrating agent comprises at least one of hydrogen peroxide, polyethylene glycol, polypropylene glycol, ethylene glycol, glycerol, ethylene glycol monobutyl ether, diethylene glycol butyl ether, hydroxybenzene derivatives and hydrazine hydrate;
the brightening agent comprises at least one of glucose, agar, sodium stannate, sodium metaaluminate, sodium silicate, triethanolamine, sodium polydithio dipropyl sulfonate, urea, 2-mercaptobenzimidazole, benzimidazole, ethylene thiourea, hydroxyethylidene diphosphonic acid, benzotriazole, sodium tungstate, sodium oleate, octohydroxyquinoline, octadecylamine, gelatin, dextrin, zinc oxide, tragacanth, sodium molybdate, sodium benzoate and 2-mercaptobenzothiazole.
7. The method for stripping the anodic oxide film on the surface of the middle frame of the aluminum highlight mobile phone according to claim 2, wherein: in the step S2), during the demolding treatment, the demolding agent is used under the following conditions:
wherein the pH value is 13-14, the temperature is 30-60 ℃, and the treatment time is 30-180 s.
8. The method for stripping the anodic oxide film on the surface of the middle frame of the aluminum highlight mobile phone according to claim 2, wherein: in step S3), the neutralizing agent is a mixture of sulfuric acid, an oxidizing agent and a stain removing agent.
9. The method for stripping the anodic oxide film on the surface of the middle frame of the aluminum highlight mobile phone according to claim 2, wherein: in the step S3), the treatment temperature of the neutralizer is 25-35 ℃, and the treatment time is 40-100S.
10. The method for stripping the anodic oxide film on the surface of the middle frame of the aluminum highlight mobile phone according to claim 2, wherein: in the step S4), the drying temperature is 60-80 ℃, and the drying treatment lasts for 10-25 min.
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