CN114262922A - Processing technology of aluminum profile with high corrosion resistance - Google Patents
Processing technology of aluminum profile with high corrosion resistance Download PDFInfo
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- CN114262922A CN114262922A CN202111667135.XA CN202111667135A CN114262922A CN 114262922 A CN114262922 A CN 114262922A CN 202111667135 A CN202111667135 A CN 202111667135A CN 114262922 A CN114262922 A CN 114262922A
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 64
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 238000005260 corrosion Methods 0.000 title claims abstract description 44
- 230000007797 corrosion Effects 0.000 title claims abstract description 40
- 238000005516 engineering process Methods 0.000 title claims abstract description 20
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- 230000003647 oxidation Effects 0.000 claims description 16
- 238000007254 oxidation reaction Methods 0.000 claims description 16
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000005530 etching Methods 0.000 claims description 14
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 10
- 150000002910 rare earth metals Chemical class 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 7
- 238000009835 boiling Methods 0.000 claims description 6
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 6
- 229910000388 diammonium phosphate Inorganic materials 0.000 claims description 6
- 235000019838 diammonium phosphate Nutrition 0.000 claims description 6
- -1 dimethyl siloxane Chemical class 0.000 claims description 6
- 235000006408 oxalic acid Nutrition 0.000 claims description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 6
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005238 degreasing Methods 0.000 claims description 5
- 239000013527 degreasing agent Substances 0.000 claims description 5
- 238000005237 degreasing agent Methods 0.000 claims description 5
- 238000007590 electrostatic spraying Methods 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 229910021389 graphene Inorganic materials 0.000 claims description 5
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 239000001488 sodium phosphate Substances 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 239000004094 surface-active agent Substances 0.000 claims description 5
- 239000008399 tap water Substances 0.000 claims description 5
- 235000020679 tap water Nutrition 0.000 claims description 5
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 5
- 229910000406 trisodium phosphate Inorganic materials 0.000 claims description 5
- 235000019801 trisodium phosphate Nutrition 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N monobenzene Natural products C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229940079886 disodium lauryl sulfosuccinate Drugs 0.000 description 3
- KHIQYZGEUSTKSB-UHFFFAOYSA-L disodium;4-dodecoxy-4-oxo-3-sulfobutanoate Chemical compound [Na+].[Na+].CCCCCCCCCCCCOC(=O)C(S(O)(=O)=O)CC([O-])=O.CCCCCCCCCCCCOC(=O)C(S(O)(=O)=O)CC([O-])=O KHIQYZGEUSTKSB-UHFFFAOYSA-L 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920006334 epoxy coating Polymers 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000003755 preservative agent Substances 0.000 description 2
- 230000002335 preservative effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- NTTLKRPWPKPUAI-UHFFFAOYSA-N (1e)-1-[amino(anilino)methylidene]-2-phenylguanidine Chemical compound C=1C=CC=CC=1N=C(N)\N=C(/N)NC1=CC=CC=C1 NTTLKRPWPKPUAI-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical compound C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Landscapes
- Coating By Spraying Or Casting (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to the processing technology of aluminum profiles, in particular to a processing technology of an aluminum profile with high corrosion resistance, which adjusts the components of a microetching solution to microetch the aluminum profile, forms a microporous structure on the surface of the aluminum profile so as to improve the binding force between a base and a spraying layer during subsequent spraying.
Description
Technical Field
The invention relates to a surface treatment technology of an aluminum profile, in particular to a processing technology of an aluminum profile with high corrosion resistance.
Background
Aluminum profiles are the most widely used non-ferrous structural materials in industry and have found a large number of applications in the aerospace, automotive, mechanical, marine and chemical industries. The rapid development of industrial economy has increased the demand for aluminum profile structural members.
Although the traditional high-strength aluminum section has higher strength, the application of the traditional high-strength aluminum section is limited by the lower fracture toughness and stress corrosion resistance. Under the condition of adopting the traditional processing technology, although the strength requirement of the aluminum profile can be met, the stress fatigue and the stress corrosion resistance can not fully meet the use requirements of the aluminum profiles in other fields, and the aluminum profile is seriously damaged due to the corrosion of external acidic or alkaline substances, so that the service life of the aluminum profile is greatly shortened.
In the prior art, the surface of the aluminum profile is sprayed with the preservative, but the preservative is easy to fall off, and the effect of corrosion prevention cannot be realized finally.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a processing technology of an aluminum profile with high corrosion resistance.
The purpose of the invention is realized by the following technical scheme: a processing technology of a high-corrosion-resistance aluminum profile comprises the following steps:
step A: degreasing the aluminum profile;
and B: spraying micro-etching solution on the surface of the aluminum profile, wherein the etching solution consists of 1-5% of hydrochloric acid, 1-5% of phosphoric acid, 0.1-1% of triethanolamine, 1-2% of diammonium hydrogen phosphate, 0.01-0.03% of dimethyl siloxane, 0.5-1.0% of 3-thiazole-2-formyl chloride and the balance of water;
and C: cleaning and drying the aluminum profile after the microetching, and placing the aluminum profile in a volume ratio of 15: (0.1-0.5): 4, carrying out anodic oxidation in an oxidation tank of sulfuric acid, oxalic acid and deionized water, then taking out, placing in boiling water for treatment for 40-60min, taking out and drying; during electrolytic oxidation treatment, a small amount of added oxalic acid improves the hardness of the oxidation film, then boiling water is used for sealing micropores in the oxidation film, drying is carried out, the micropores are reduced, the density of the oxidation film is improved, and the uniformity and high compactness of the oxidation film are ensured;
step D: and spraying a corrosion-resistant layer on the surface of the cleaned and dried aluminum profile, wherein the corrosion-resistant layer is obtained by uniformly dispersing 3-5 parts of modified graphene, 1-3 parts of silicon carbide and 1-3 parts of nano zirconia in 10-20 parts of deionized water, adding 90-100 parts of epoxy resin, uniformly dispersing, adding 45-50 parts of curing agent, uniformly stirring, and finally placing the sprayed aluminum profile into a curing box for curing and naturally cooling. The modified graphene, the silicon carbide and the nano zirconia in the corrosion-resistant layer have good corrosion resistance and hardness, so that a compact physical isolation layer can be formed, the diffusion of a corrosion medium in the epoxy coating is delayed, and the protective performance of the corrosion medium on a substrate is improved.
The degreasing agent in the step A comprises 70-100g/l of sodium hydroxide, 30-50g/l of trisodium phosphate and 6-8g/l of surfactant.
And the temperature of the microetching in the step B is 15-30 ℃, and the time is 30-40 min.
In the step C, the temperature is 12-25 ℃, the current density is 1-2A/dm2, the voltage is 13-23V, and the time is 30-40 min.
And the step C is washing by tap water, and the drying temperature is 20-30 ℃.
And D, in the step D, the pressure of compressed air is 0.4-0.7Mpa, the voltage of electrostatic spraying is 50-60KV, and the distance between a spray gun and the workpiece is 100-150 mm.
The modified graphene is prepared by adding 2-4 parts by weight of lanthanum chloride and 1-2 parts by weight of silane coupling agent KH550 into 5-10 parts by weight of ethanol to obtain a rare earth solution, soaking 2-4 parts by weight of graphene oxide into 5-10 parts by weight of N, N-dimethylformamide, then adding into the rare earth solution, washing, drying, and further improving the corrosion resistance through modification.
The curing temperature in the step D is 210-220 ℃, and the curing time is 30-60 min.
B, inorganic acid in the microetching solution is used for reducing or stripping oxide on the surface of the metal, diammonium hydrogen phosphate is used as a stabilizer and acts on inhibiting active atomic oxygen from being combined into oxygen to escape, and therefore a certain amount of atomic oxygen in the solution is maintainedConcentration, the etching action of the solution is maintained. The dimethyl siloxane can reduce the generation of foams and prevent generated bubbles from attaching to the surface of a workpiece to influence the etching process. Triethanolamine can be used as metal chelating agent to prevent A1 in etching solution3+The triethanolamine can also be used as a corrosion inhibitor, one-time microetching mainly provides a stable microetching environment, and oxides on the metal surface are reduced or stripped to form a microporous structure. The amine corrosion inhibitor and the thiazole corrosion inhibitor are matched to easily form a barrier film on the surface of metal, so that the corrosion inhibition effect is achieved, and the influence on the product quality caused by the over-high etching speed is prevented.
The step B removes the naturally generated oxide film through microetching, so that the oxide film with uniform texture is conveniently generated through anodic oxidation in the step C in the later period,
the thickness of the coating is 15-25 μm, and then the coating is dried by using a drying box, wherein the temperature in the drying box is 150-180 ℃, and the drying time is 2.5-3 h.
Compared with the prior art, the invention has the following advantages and beneficial effects: the corrosion-resistant layer sprayed is beneficial to forming a compact physical isolation layer on the surface of the aluminum profile, delaying the diffusion of a corrosion medium in an epoxy coating and improving the protective performance of the corrosion medium on the substrate.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to examples in order to facilitate understanding of those skilled in the art, but the scope of the present invention is not limited to the examples described below.
Example 1
A processing technology of a high-corrosion-resistance aluminum profile comprises the following steps:
step A: degreasing the aluminum profile;
and B: spraying a micro-etching solution on the surface of the aluminum profile, wherein the etching solution consists of 1% of hydrochloric acid, 1% of phosphoric acid, 0.1% of triethanolamine, 1% of diammonium hydrogen phosphate, 0.01% of dimethyl siloxane, 0.5% of 3-thiazole-2-formyl chloride and the balance of water;
and C: cleaning and drying the aluminum profile after the microetching, and placing the aluminum profile in a volume ratio of 15: 0.1: 4, carrying out anodic oxidation in an oxidation tank of sulfuric acid, oxalic acid and deionized water, then taking out, placing in boiling water for treatment for 40min, taking out and drying;
step D: and (2) spraying a corrosion-resistant layer on the surface of the cleaned and dried aluminum profile, wherein the corrosion-resistant layer is obtained by uniformly dispersing 3 parts of modified graphene, 1 part of silicon carbide and 1 part of nano-zirconia in 10 parts of deionized water, adding 90 parts of glycerol epoxy resin for uniform dispersion, adding 45 parts of m-1, 3-diamino-5-carboxyl benzene curing agent for uniform stirring, and finally placing the sprayed aluminum profile into a curing box for curing and naturally cooling. The thickness of the corrosion-resistant layer coating was 16 μm.
The degreasing agent in the step A comprises 70g/l of sodium hydroxide, 30g/l of trisodium phosphate and 6g/l of surfactant disodium lauryl sulfosuccinate.
And the temperature of the microetching in the step B is 15 ℃ and the time is 30 min.
In the step C, the temperature is 12 ℃, the current density is 1A/dm2, the voltage is 13V, and the time is 30 min.
And the step C is washing by tap water, and the drying temperature is 20 ℃.
And D, in the step D, the compressed air pressure is 0.4Mpa, the electrostatic spraying voltage is 50KV, and the distance between the spray gun and the workpiece is 100 mm.
The modified graphene is prepared by adding 2 parts by weight of lanthanum chloride and 1 part by weight of silane coupling agent KH550 into 5 parts by weight of ethanol to obtain a rare earth solution, soaking 2 parts by weight of graphene oxide into 5 parts by weight of N, N-dimethylformamide, then adding into the rare earth solution, washing and drying.
And D, curing at 210 ℃ for 60 min.
Comparative example 1: the present invention differs from embodiment 1 in that step B is omitted.
The coating of the embodiment of the invention has the hardness of 5H, the contact angle of 160 and the rolling angle of 6, and the peel strength is 12 percent higher than that of the coating of the embodiment of the invention 1. The surface of the aluminum profile treated by the method has excellent wear resistance, stain resistance and corrosion resistance.
Example 2
A processing technology of a high-corrosion-resistance aluminum profile comprises the following steps:
step A: degreasing the aluminum profile;
and B: spraying a micro-etching solution on the surface of the aluminum profile, wherein the etching solution consists of 2% of hydrochloric acid, 3% of phosphoric acid, 0.5% of triethanolamine, 1% of diammonium hydrogen phosphate, 0.02% of dimethyl siloxane, 0.8% of 3-thiazole-2-formyl chloride and the balance of water;
and C: cleaning and drying the aluminum profile after the microetching, and placing the aluminum profile in a volume ratio of 15: 0.4: 4, carrying out anodic oxidation in an oxidation tank of sulfuric acid, oxalic acid and deionized water, then taking out and placing in boiling water for treatment for 50min, taking out and drying;
step D: and (2) spraying an anti-corrosion layer on the surface of the cleaned and dried aluminum profile, wherein the anti-corrosion layer is obtained by uniformly dispersing 4 parts of modified graphene, 2 parts of silicon carbide and 2 parts of nano zirconia in 15 parts of deionized water, adding the mixture into 95 parts of E-51 type epoxy resin for uniform dispersion, adding 45 parts of diphenyl biguanide curing agent, uniformly stirring, and finally placing the sprayed aluminum profile into a curing box for curing and naturally cooling. The thickness of the corrosion-resistant layer coating was 18 μm.
The degreasing agent in the step A comprises 80g/l of sodium hydroxide, 40g/l of trisodium phosphate and 7g/l of surfactant disodium lauryl sulfosuccinate.
And the temperature of the microetching in the step B is 23 ℃, and the time is 35 min.
In the step C, the temperature is 22 ℃, the current density is 2A/dm2, the voltage is 20V, and the time is 35 min.
And the step C is washing by tap water, and the drying temperature is 25 ℃.
And D, when spraying is carried out in the step D, the pressure of compressed air is 0.6Mpa, the voltage of electrostatic spraying is 56KV, and the distance between a spray gun and the workpiece is 120 mm.
The modified graphene is prepared by adding 3 parts by weight of lanthanum chloride and 2 parts by weight of silane coupling agent KH550 into 7 parts by weight of ethanol to obtain a rare earth solution, soaking 3 parts by weight of graphene oxide into 6 parts by weight of N, N-dimethylformamide, then adding into the rare earth solution, washing and drying.
And in the step D, the curing temperature is 215 ℃ and the curing time is 40 min.
Comparative example 2: the present invention differs from embodiment 2 in that step B is omitted.
The coating of the embodiment of the invention has the hardness of 5H, the contact angle of 162 and the rolling angle of 5, and the peel strength is improved by 13 percent compared with that of the comparative example 2. The surface of the aluminum profile treated by the method has excellent wear resistance, stain resistance and corrosion resistance.
Example 3
A processing technology of a high-corrosion-resistance aluminum profile comprises the following steps:
step A: degreasing the aluminum profile;
and B: spraying a micro-etching solution on the surface of the aluminum profile, wherein the etching solution consists of 5% of hydrochloric acid, 5% of phosphoric acid, 1% of triethanolamine, 2% of diammonium hydrogen phosphate, 0.03% of dimethyl siloxane, 1.0% of 3-thiazole-2-formyl chloride and the balance of water;
and C: cleaning and drying the aluminum profile after the microetching, and placing the aluminum profile in a volume ratio of 15: 0.5: 4, carrying out anodic oxidation in an oxidation tank of sulfuric acid, oxalic acid and deionized water, then taking out, placing in boiling water for treatment for 60min, taking out and drying;
step D: and (2) spraying an anti-corrosion layer on the surface of the cleaned and dried aluminum profile, wherein the anti-corrosion layer is obtained by uniformly dispersing 5 parts of modified graphene, 3 parts of silicon carbide and 3 parts of nano zirconia in 20 parts of deionized water, adding 100 parts of glycerol epoxy resin for uniform dispersion, adding 50 parts of m-1, 3-diamino-5-carboxyl benzene curing agent for uniform stirring, and finally placing the sprayed aluminum profile into a curing box for curing and naturally cooling. The thickness of the corrosion-resistant layer coating was 20 μm.
The degreasing agent in the step A comprises 100g/l of sodium hydroxide, 50g/l of trisodium phosphate and 8g/l of surfactant disodium lauryl sulfosuccinate.
And the temperature of the microetching in the step B is 30 ℃ and the time is 40 min.
In the step C, the temperature is 25 ℃, the current density is 2A/dm2, the voltage is 23V, and the time is 40 min.
And the step C is washing by tap water, and the drying temperature is 30 ℃.
And D, in the step D, the compressed air pressure is 0.7Mpa, the electrostatic spraying voltage is 60KV, and the distance between the spray gun and the workpiece is 150 mm.
The modified graphene is prepared by adding 4 parts by weight of lanthanum chloride and 2 parts by weight of silane coupling agent KH550 into 10 parts by weight of ethanol to obtain a rare earth solution, soaking 4 parts by weight of graphene oxide into 10 parts by weight of N, N-dimethylformamide, then adding into the rare earth solution, washing and drying.
And D, curing at 220 ℃ for 60 min.
Comparative example 3: the present invention differs from embodiment 3 in that step B is omitted.
The coating of the embodiment of the invention has the hardness of 5H, the contact angle of 163 and the rolling angle of 6, and the peel strength is improved by 14 percent compared with that of the comparative example 3. The surface of the aluminum profile treated by the method has excellent wear resistance, stain resistance and corrosion resistance.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and therefore, all equivalent changes made in the claims of the present invention are included in the protection scope of the present invention.
Claims (8)
1. The processing technology of the aluminum profile with high corrosion resistance is characterized by comprising the following steps of: the method comprises the following steps:
step A: degreasing the aluminum profile;
and B: spraying micro-etching solution on the surface of the aluminum profile, wherein the etching solution consists of 1-5% of hydrochloric acid, 1-5% of phosphoric acid, 0.1-1% of triethanolamine, 1-2% of diammonium hydrogen phosphate, 0.01-0.03% of dimethyl siloxane, 0.5-1.0% of 3-thiazole-2-formyl chloride and the balance of water;
and C: cleaning and drying the aluminum profile after the microetching, and placing the aluminum profile in a volume ratio of 15: (0.1-0.5): 4, carrying out anodic oxidation in an oxidation tank of sulfuric acid, oxalic acid and deionized water, then taking out, placing in boiling water for treatment for 40-60min, taking out and drying;
step D: and spraying a corrosion-resistant layer on the surface of the cleaned and dried aluminum profile, wherein the corrosion-resistant layer is obtained by uniformly dispersing 3-5 parts of modified graphene, 1-3 parts of silicon carbide and 1-3 parts of nano zirconia in 10-20 parts of deionized water, adding 90-100 parts of epoxy resin, uniformly dispersing, adding 45-50 parts of curing agent, uniformly stirring, and finally placing the sprayed aluminum profile into a curing box for curing and naturally cooling.
2. The processing technology of the aluminum profile with high corrosion resistance according to claim 1 is characterized in that: the degreasing agent in the step A comprises 70-100g/l of sodium hydroxide, 30-50g/l of trisodium phosphate and 6-8g/l of surfactant.
3. The processing technology of the aluminum profile with high corrosion resistance according to claim 1 is characterized in that: and the temperature of the microetching in the step B is 15-30 ℃, and the time is 30-40 min.
4. The processing technology of the aluminum profile with high corrosion resistance according to claim 1 is characterized in that: in the step C, the temperature is 12-25 ℃, the current density is 1-2A/dm2, the voltage is 13-23V, and the time is 30-40 min.
5. The processing technology of the aluminum profile with high corrosion resistance according to claim 1 is characterized in that: and the step C is washing by tap water, and the drying temperature is 20-30 ℃.
6. The processing technology of the aluminum profile with high corrosion resistance according to claim 1 is characterized in that: and D, in the step D, the pressure of compressed air is 0.4-0.7Mpa, the voltage of electrostatic spraying is 50-60KV, and the distance between a spray gun and the workpiece is 100-150 mm.
7. The processing technology of the aluminum profile with high corrosion resistance according to claim 1 is characterized in that: the modified graphene is prepared by adding 2-4 parts by weight of lanthanum chloride and 1-2 parts by weight of silane coupling agent KH550 into 5-10 parts by weight of ethanol to obtain a rare earth solution, soaking 2-4 parts by weight of graphene oxide into 5-10 parts by weight of N, N-dimethylformamide, then adding into the rare earth solution, washing and drying.
8. The processing technology of the aluminum profile with high corrosion resistance according to claim 1 is characterized in that: the curing temperature in the step D is 210-220 ℃, and the curing time is 30-60 min.
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Cited By (2)
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| CN114737238A (en) * | 2022-04-07 | 2022-07-12 | 仪征海天铝业有限公司 | Processing technology of aluminum profile |
| CN116099742A (en) * | 2023-01-10 | 2023-05-12 | 苏州安踏脚手架工程有限公司 | Surface treatment method for building scaffold pipe |
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| CN116099742A (en) * | 2023-01-10 | 2023-05-12 | 苏州安踏脚手架工程有限公司 | Surface treatment method for building scaffold pipe |
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| CN114262922B (en) | 2024-06-18 |
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