CN114032597A - Method for preventing GBn167 material from blackening after conductive oxidation - Google Patents
Method for preventing GBn167 material from blackening after conductive oxidation Download PDFInfo
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- CN114032597A CN114032597A CN202111322537.6A CN202111322537A CN114032597A CN 114032597 A CN114032597 A CN 114032597A CN 202111322537 A CN202111322537 A CN 202111322537A CN 114032597 A CN114032597 A CN 114032597A
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- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 65
- 230000003647 oxidation Effects 0.000 title claims abstract description 64
- 239000000463 material Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000001035 drying Methods 0.000 claims abstract description 16
- 238000005498 polishing Methods 0.000 claims abstract description 15
- 238000005406 washing Methods 0.000 claims description 63
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 230000007797 corrosion Effects 0.000 claims description 28
- 238000005260 corrosion Methods 0.000 claims description 28
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 16
- 238000005530 etching Methods 0.000 claims description 11
- 238000011010 flushing procedure Methods 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 239000004519 grease Substances 0.000 claims description 10
- 238000005491 wire drawing Methods 0.000 claims description 9
- 235000013024 sodium fluoride Nutrition 0.000 claims description 8
- 239000011775 sodium fluoride Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 7
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 6
- 239000012459 cleaning agent Substances 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 4
- -1 potassium ferricyanide Chemical compound 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 229910000423 chromium oxide Inorganic materials 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- FFRBMBIXVSCUFS-UHFFFAOYSA-N 2,4-dinitro-1-naphthol Chemical compound C1=CC=C2C(O)=C([N+]([O-])=O)C=C([N+]([O-])=O)C2=C1 FFRBMBIXVSCUFS-UHFFFAOYSA-N 0.000 abstract description 5
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 5
- 238000004381 surface treatment Methods 0.000 abstract description 3
- 238000005034 decoration Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000010410 layer Substances 0.000 description 9
- 239000003921 oil Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000010949 copper Substances 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000013268 sustained release Methods 0.000 description 4
- 239000012730 sustained-release form Substances 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 238000007517 polishing process Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 206010027146 Melanoderma Diseases 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000010407 anodic oxide Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- 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
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
- C22C21/14—Alloys based on aluminium with copper as the next major constituent with silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
- C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
- C22C21/18—Alloys based on aluminium with copper as the next major constituent with zinc
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/32—Alkaline compositions
- C23F1/36—Alkaline compositions for etching aluminium or alloys thereof
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F3/00—Brightening metals by chemical means
- C23F3/02—Light metals
- C23F3/03—Light metals with acidic solutions
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- C—CHEMISTRY; METALLURGY
- 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
- C25D11/16—Pretreatment, e.g. desmutting
-
- C—CHEMISTRY; METALLURGY
- 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
Abstract
The invention relates to the field of aluminum alloy surface treatment and processing, in particular to a method for preventing GBn167 material from blackening after conductive oxidation, which comprises the following steps: 1) removing oil; 2) corroding; 3) emitting light; 4) then light is emitted; 5) polishing; 6) conducting oxidation; 7) fixing the membrane by hot water; 8) drying, inspecting and warehousing; after the treatment by the method, the GBn167 material part presents golden yellow appearance after conductive oxidation, the phenomenon that the GBn167 material generates black spots after conductive oxidation is effectively overcome, the product quality and the working efficiency of the GBn167 material are improved, and the GBn167 material is more efficiently and widely applied to the industries of aviation, building, automobile manufacturing, decoration and the like.
Description
Technical Field
The invention relates to the field of aluminum alloy surface treatment and processing, in particular to a method for preventing GBn167 material from blackening after conductive oxidation.
Technical Field
GBn167 is a heat-resistant hard aluminum, and is characterized in that: the strength is not too high at normal temperature, but higher creep strength is obtained at high temperature, the alloy has strength plasticity in a hot state, no extrusion effect, can be processed and strengthened, spot welding and roll welding have good welding performance, the tendency of forming cracks is not obvious, the air tightness of a welding seam is good, the corrosion stability of the welding seam is low, the corrosion stability of an aluminum-clad plate is good, the corrosion resistance of an extruded semi-finished product is not high, and in order to prevent corrosion, anodic oxidation treatment or painting protection is adopted: the machinability is still good.
With the improvement of product performance, the requirement for surface treatment is higher and higher, and the conventional processing technology for conductive oxidation of aluminum and aluminum alloy cannot meet the appearance requirement of GBn167 material aluminum alloy after conductive oxidation. The processing technology for conductive oxidation of the aluminum alloy of the conventional materials 5A03, 5A06 and 2A12 comprises the following steps: organic degreasing, primary flow washing, hanging, corrosion, primary flow washing, secondary flow washing, hot washing, light-emitting primary flow washing, secondary corrosion, primary flow washing, secondary flow washing, hot washing, light-emitting, primary flow washing, secondary flow washing, hot washing, conductive oxidation, primary flow washing, secondary flow washing, hot water film fixing, drying, inspection and warehousing. The corrosion needs to be carried out twice in the traditional procedure, and the two times of corrosion have the function of ensuring that the surface of the part is free from excess substances such as oil stains and the like after the pretreatment of the part; because GBn167 has low corrosion resistance, the GBn167 material parts after oxidation by the process have yellow appearance of black spot, which is not beneficial for oxidation of GBn167 material. Therefore, the existing processing technology can not meet the product requirements, if the wire drawing cloth is used for polishing black spots and conducting oxidation is carried out again, a large amount of talent consumption and increase of labor cost can be caused, and the effect is not ideal and the black spots can not be polished and removed.
The etching step is to remove the residual natural oxide film and the residue of the aluminum substrate etched in the degreasing step; removing dirt such as grease and the like penetrating into the aluminum-based surface layer; removing the deteriorated alloy layer on the surface; eliminating extrusion, mold mark, scratch and other surface defects, and regulating and leveling the surface of the matrix to be uniform; and the excessive corrosion causes the part of the GBn167 material to be numb and generate black spots.
In order to prevent the GBn167 material from blackening after conductive oxidation treatment, the invention carries out process adjustment on the prior processing technology, so that the GBn167 material has unchanged performance after conductive oxidation, the surface of a part is golden yellow to meet the appearance requirement, and the product quality and the working efficiency are improved.
Disclosure of Invention
The invention mainly solves the technical problem of providing a method for preventing GBn167 material from blackening after conductive oxidation, and ensuring that the surface of a part is golden yellow and has no black spots after conductive oxidation.
In order to solve the technical problems, the technical method adopted by the invention is as follows:
a method of preventing blackening of a GBn167 material after conductive oxidation, comprising the steps of:
1) oil removal: soaking the parts in an organic solution at the temperature of 30-50 ℃ to remove grease and ash layers on the surfaces of the parts made of the GBn167 materials, then washing the parts for 10-15s by using first-stage flowing water, and then binding the parts by using aluminum wires, titanium materials, nylon or PVC materials for hanging;
2) and (3) corrosion: putting the parts washed by the water in the step 1) into NaOH solution for alkaline etching for 10-30 s, washing the parts for 10-15s by using first-stage flowing water, removing the NaOH solution on the surfaces of the parts, washing the surfaces and the hole cavities of the parts for 10-15s by using second-stage flowing water, and washing the parts for 20-60 s by using hot water at the temperature of 40-50 ℃, so as to prevent residual alkali liquor from polluting the next process and prevent the surfaces of the parts from generating alkaline corrosion spots;
3) light emission: putting the part obtained by the treatment in the step 2) into HNO at room temperature3Soaking in the solution for 10-30 s, washing the surface of the part for 10-15s by using first-stage running water, and removing HNO3Fully washing the surface of the part for 10-15s by using secondary flowing water, and then washing for 10-20 s by using hot water at the temperature of 40-50 ℃;
4) and (3) emergent light: repeating the operation of step 3);
5) polishing: polishing the surface of the part obtained in the step 4) by using a wire-drawing cloth, clearly displaying each fine wire mark through wire-drawing treatment, flushing the surface of the part for 10-15s by using first-stage flowing water after ensuring that the lines are consistent, flushing the surface of the part for 10-15s by using second-stage flowing water, and flushing the surface of the part for 50-60s by using hot water at the temperature of 40-50 ℃;
6) conducting oxidation: placing the part obtained by the treatment in the step 5) into a conductive oxidation solution for conductive oxidation, then washing the surface of the part for 10-15s by using primary running water, and then fully washing the surface of the part for 10-15s by using secondary running water;
7) film fixing: putting the part obtained by the treatment in the step 6) into hot water for film fixation;
8) drying, inspecting and warehousing: drying the parts obtained by the treatment in the step 7), inspecting according to the QJ487 standard, and packaging qualified parts for storage.
Preferably, all the organic solutions in the step 1) comprise the following components in percentage by mass: 10-15% of water-based cleaning agent and 85-90% of water.
Preferably, the mass concentration of the NaOH solution in the step 2) is 20-35 g/L, and the alkaline etching temperature is 60 ℃ or 65 ℃.
Preferably, the HNO of step 3)3The mass concentration of the solution is 15-30%.
Preferably, the conductive oxidation solution in the step 5) is composed of water as a solvent, chromic anhydride, potassium ferricyanide, sodium fluoride and a sustained release agent as a solute, wherein CrO33.0～10.0g/L、NaF 0.7～1.5g/L、K3Fe(CN)60.3-1.0 g/L, and 0.2-0.5 g/L of slow release agent.
The working conditions of the conductive oxidation are as follows: the current density is 1.0-2.5A/dm2The temperature is 25-45 ℃, and the oxidation time is 0.5-1.5 min.
Preferably, the working conditions of the film fixing in the step 6) are as follows: the temperature is 40-50 ℃ and the time is 30-60 s.
Preferably, the drying temperature in the step 7) is 40-50 ℃, and the drying time is 10-15 min.
The chemical cost of the GBn167 material in percentage by mass is as follows: 0.30% of Si, 0.30% of Fe, 6.0-7.0% of Cu, 0.40-0.8% of Mn, 0.05% of Mg, 0.10% of Zn, 0.10-0.20% of Ti and the balance of Al.
The qualified parts have tensile strength sigma b (MPa) of not less than 355 and conditional yield strength sigma 0.2(MPa) of not less than 235.
The primary flowing water and the secondary flowing water are both tap water, the purpose is to clean the surplus on the parts, and because the surplus exists in each tank when the parts are cleaned, two times of flowing water washing are needed, namely the primary flowing water and the secondary flowing water.
The invention has the beneficial effects that:
the method can effectively prevent the GBn167 material from generating black spots in the conductive oxidation process, so that parts after anodic oxidation have golden yellow appearance, the grain direction is consistent and beautiful, the oxidation film of the parts has the advantages of corrosion resistance, wear resistance, temperature resistance, strong insulating property and the like, the product quality and the working efficiency of the GBn167 material are improved, and the GBn167 material can be more efficiently and widely applied to the industries of aviation, building, automobile manufacturing, decoration and the like.
The invention avoids using solvent which can corrode parts before conductive oxidation, and the water-based cleaning agent is used for cleaning the surfaces of the parts, thereby having good oil removal and decontamination effects and not causing damage and corrosion adverse effects on the parts.
The invention ensures the good mechanical property and appearance quality of the GBn167 material, reduces the secondary corrosion process and greatly saves the treatment process. Because the corrosion resistance of GBn167 is not high, black spots are mainly generated in the corrosion process; therefore, the sodium hydroxide is used for corrosion during the first alkaline etching, an oxide film naturally generated on the surface of the part and residual grease can be removed, metal crystals are exposed, further oxidation of aluminum is avoided, the influence of water resistance on the generation of an anodic oxide film is avoided, the pretreatment of the product is ensured to meet requirements, a uniform film layer can be generated during chemical oxidation, the alkaline etching time is controlled within 10-30 s, the oxide film is completely removed, the phenomenon that the part is numbed to generate black spots is avoided, and the performance of the GBn167 material is prevented from being reduced due to excessive corrosion.
The invention is washed by first-stage running water, second-stage running water and hot water in sequence after the alkaline etching, can fully remove the residual alkaline liquor on the surface of the part, and avoids the recontamination and excessive corrosion of the alkaline liquor.
According to the invention, the black loose substances formed by iron, manganese, copper, magnesium and silicon remained on the surface of the part can be fully washed out by carrying out light-emitting treatment twice, so that the surface of the part is glossy. After the light is emitted, the surface of the part is polished by using the wiredrawing cloth, the grain direction is ensured to be consistent, then the conductive oxidation process is carried out, golden yellow conductive oxidation can be obtained, the product requirement and the appearance requirement are met, and the phenomenon that the GBn167 material is blackened after the conductive oxidation treatment is effectively prevented.
The GBn167 material treated by the method of the invention does not affect the mechanical properties such as tensile strength of the parts, can ensure the excellent mechanical properties of the materials, and effectively improves the conductivity and oxidation resistance of the materials.
Detailed Description
The technical process of the present invention is further described below, but the scope of the claimed invention is not limited thereto.
The following recommendations were made for the following examples:
example 1
A method for preventing GBn167 material from blackening after conductive oxidation, the GBn167 material having a chemical cost in mass percent as follows: 0.30% of Si, 0.30% of Fe, 6.0-7.0% of Cu, 0.40-0.8% of Mn, 0.05% of Mg, 0.10% of Zn, 0.10-0.20% of Ti and the balance of Al; the method comprises the following steps:
1) oil removal: removing surface grease and ash layers of the GBn167 material parts by using an organic solution with the temperature of 45 ℃, then washing the parts for 15s by using first-level flowing water, and binding the parts by using aluminum wires for hanging; the organic solution is prepared from 15% of water-based cleaning agent and 85% of water in percentage by mass;
2) and (3) corrosion: putting the part washed by the water in the step 1) into NaOH solution with the temperature of 60 ℃ and the concentration of 30g/L for alkaline etching for 35s, removing an oxide film and residual grease substances naturally generated on the surface of the part, exposing metal crystals, generating a uniform film layer during conductive oxidation, washing the part surface and a hole cavity part for 15s by using primary running water, washing the part surface and the hole cavity part for 15s by using secondary running water, and then washing the part surface and the hole cavity part for 50s by using hot water with the temperature of 45 ℃, so as to prevent the residual alkali liquor from polluting the next process and prevent the part surface from generating alkaline corrosion spots;
3) light emission: placing the part obtained by the treatment in the step 2) into HNO with the mass concentration of 30% at room temperature3Soaking the parts in the solution for 20s, washing the parts for 15s by using first-stage running water to remove the nitric acid solution on the surfaces of the parts, washing the surfaces of the parts for 15s by using second-stage running water, and then washing the parts for 15s by using hot water at the temperature of 45 ℃;
4) and (3) emergent light: repeating the operation of step 3);
5) polishing: polishing the surface of the part obtained by the step 4) by using a wire-drawing cloth, ensuring the grain direction to be consistent in the polishing process, clearly showing each fine silk mark on the surface of the part after polishing treatment, then flushing the surface of the part by using primary flowing water for 15s, flushing the surface of the part by using secondary flowing water for 15s, and flushing by using hot water at 45 ℃ for 50 s;
6) conducting oxidation: at a current density of 2.0A/dm2Placing the part obtained by the treatment in the step 5) into a conductive oxidation solution at the temperature of 30 ℃ for conductive oxidation for 1.0min, then flushing the surface of the part with primary flowing water for 15s, and then flushing the surface of the part with secondary flowing water for 15 s; CrO in the conductive oxidation solution35.0g/L、NaF 1.0g/L、K3Fe(CN)60.5g/L and 0.3g/L of sustained release agent;
7) film fixing: putting the part obtained by the treatment in the step 6) into hot water at 45 ℃ for film solidification treatment for 50 s;
8) drying, inspecting and warehousing: drying the parts obtained by the treatment in the step 7) at 50 ℃ for 13min, then inspecting according to the QJ487 standard, and packaging qualified parts for storage.
Example 2
A method for preventing GBn167 material from blackening after conductive oxidation, the GBn167 material having a chemical cost in mass percent as follows: 0.30% of Si, 0.30% of Fe, 6.0-7.0% of Cu, 0.40-0.8% of Mn, 0.05% of Mg, 0.10% of Zn, 0.10-0.20% of Ti and the balance of Al, and comprises the following steps:
1) oil removal: removing surface grease and ash layers of the GBn167 material parts by using an organic solution with the temperature of 45 ℃, then washing the parts for 13s by using first-level flowing water, and binding the parts by using aluminum wires for hanging; the organic solution is prepared from 13% of water-based cleaning agent and 87% of water in percentage by mass;
2) and (3) corrosion: putting the part washed by the water in the step 1) into NaOH solution with the temperature of 60 ℃ and the concentration of 35g/L for alkaline etching for 25s, removing an oxide film and residual grease substances naturally generated on the surface of the part, exposing metal crystals, generating a uniform film layer during conductive oxidation, washing the part surface and a hole cavity part for 13s by using primary running water, washing the part surface and the hole cavity part for 13s by using secondary running water, and washing the part surface and the hole cavity part for 40s by using hot water with the temperature of 45 ℃, so as to prevent the residual alkali liquor from polluting the next process and prevent the part surface from generating alkaline corrosion spots;
3) light emission: placing the part obtained by the treatment in the step 2) into HNO with the mass concentration of 25% at room temperature3Soaking the parts in the solution for 25s, washing the parts for 13s by using first-stage running water to remove the nitric acid solution on the surfaces of the parts, washing the surfaces of the parts for 15s by using second-stage running water, and then washing the parts for 20s by using hot water at the temperature of 40 ℃;
4) and (3) emergent light: repeating the operation of step 3);
5) polishing: polishing the surface of the part obtained by the step 4) by using a wire-drawing cloth, ensuring the grain direction to be consistent in the polishing process, clearly showing each fine silk mark on the surface of the part after polishing treatment, then washing the surface of the part for 13s by using primary flowing water, washing the surface of the part for 13s by using secondary flowing water, and washing for 50s by using hot water at 40 ℃;
6) conducting oxidation: at a current density of 1.5A/dm2Placing the part obtained by the treatment in the step 5) into a conductive oxidation solution at the temperature of 35 ℃ for conductive oxidation for 0.8min, then washing the surface of the part for 13s by using first-stage flowing water, and then washing the surface of the part for 13s by using second-stage flowing water; CrO in the conductive oxidation solution36.0g/L、NaF 1.2g/L、K3Fe(CN)60.8g/L and 0.5g/L of sustained release agent;
7) film fixing: putting the part obtained by the treatment in the step 6) into hot water at 50 ℃ for film solidification treatment for 45 s;
8) drying, inspecting and warehousing: drying the parts obtained by the treatment in the step 7) at 45 ℃ for 15min, then inspecting according to the QJ487 standard, and packaging qualified parts for storage.
Example 3
A method for preventing GBn167 material from blackening after conductive oxidation, the GBn167 material having a chemical cost in mass percent as follows: 0.30% of Si, 0.30% of Fe, 6.0-7.0% of Cu, 0.40-0.8% of Mn, 0.05% of Mg, 0.10% of Zn, 0.10-0.20% of Ti and the balance of Al, and comprises the following steps:
1) oil removal: removing surface grease and ash layers of the GBn167 material parts by using an organic solution with the temperature of 30 ℃, then washing for 15s by using first-level flowing water, and then binding the parts by using aluminum wires for hanging; the organic solution is prepared from 10% of water-based cleaning agent and 90% of water in percentage by mass;
2) and (3) corrosion: putting the part washed by the water in the step 1) into NaOH solution with the temperature of 65 ℃ and the concentration of 25g/L for alkaline etching for 30s, removing an oxide film and residual grease substances naturally generated on the surface of the part, exposing metal crystals, generating a uniform film layer during conductive oxidation, washing the part surface and a hole cavity part for 15s by using primary running water, washing the part surface and the hole cavity part for 15s by using secondary running water, and then washing the part surface and the hole cavity part for 35s by using hot water with the temperature of 50 ℃, so as to prevent the residual alkali liquor from polluting the next process and prevent the part surface from generating alkaline corrosion spots;
3) light emission: placing the part obtained by the treatment in the step 2) into HNO with the mass concentration of 20% at room temperature3Soaking in the solution for 30s, washing with first-stage flowing water for 15s to remove the nitric acid solution on the surface of the part, washing with second-stage flowing water for 10s, and washing with hot water at 40 ℃ for 15 s;
4) and (3) emergent light: repeating the operation of step 3);
5) polishing: polishing the surface of the part obtained by the step 4) by using a wire-drawing cloth, ensuring the grain direction to be consistent in the polishing process, clearly showing each fine silk mark on the surface of the part after polishing treatment, then washing the surface of the part by using primary flowing water for 10s, washing the surface of the part by using secondary flowing water for 10s, and washing the surface of the part by using hot water at 50 ℃ for 60 s;
6) conducting oxidation: at a current density of 1.0A/dm2Placing the part obtained by the treatment in the step 5) into a conductive oxidation solution at the temperature of 40 ℃ for conductive oxidation for 1.5min, then washing the surface of the part for 10s by using primary flowing water, and then washing the surface of the part for 10s by using secondary flowing water; CrO in the conductive oxidation solution33.0g/L、NaF 10.7g/L、K3Fe(CN)60.3g/L and 0.2g/L of sustained release agent;
7) film fixing: putting the part obtained by the treatment in the step 6) into hot water at 40 ℃ for film solidification treatment for 60 s;
8) drying, inspecting and warehousing: drying the parts obtained by the treatment in the step 7) at 50 ℃ for 10min, then inspecting according to the QJ487 standard, and packaging qualified parts for warehousing.
Claims (10)
1. A method of preventing blackening of a GBn167 material after conductive oxidation, comprising the steps of:
1) oil removal: soaking the parts in an organic solution at the temperature of 30-50 ℃ to remove grease and ash layers on the surfaces of the parts made of the GBn167 materials, then washing the parts for 10-15s by using first-stage flowing water, and then binding the parts by using aluminum wires, titanium materials, nylon or PVC materials for hanging;
2) and (3) corrosion: putting the parts washed by the water in the step 1) into NaOH solution for alkaline etching for 10-30 s, washing the parts for 10-15s by using first-stage flowing water, removing the NaOH solution on the surfaces of the parts, washing the surfaces and the hole cavities of the parts for 10-15s by using second-stage flowing water, and washing the parts for 20-60 s by using hot water at the temperature of 40-50 ℃, so as to prevent residual alkali liquor from polluting the next process and prevent the surfaces of the parts from generating alkaline corrosion spots;
3) light emission: putting the part obtained by the treatment in the step 2) into HNO at room temperature3Soaking in the solution for 10-30 s, washing the surface of the part for 10-15s by using first-stage running water, and removing HNO3Fully washing the surface of the part for 10-15s by using secondary flowing water, and then washing for 10-20 s by using hot water at the temperature of 40-50 ℃;
4) and (3) emergent light: repeating the operation of step 3);
5) polishing: polishing the surface of the part obtained in the step 4) by using a wire-drawing cloth, clearly displaying each fine wire mark through wire-drawing treatment, flushing the surface of the part for 10-15s by using first-stage flowing water after ensuring that the lines are consistent, flushing the surface of the part for 10-15s by using second-stage flowing water, and flushing the surface of the part for 50-60s by using hot water at the temperature of 40-50 ℃;
6) conducting oxidation: placing the part obtained by the treatment in the step 5) into a conductive oxidation solution for conductive oxidation, then washing the surface of the part for 10-15s by using primary running water, and then fully washing the surface of the part for 10-15s by using secondary running water;
7) film fixing: putting the part obtained by the treatment in the step 6) into hot water for film fixation;
8) drying, inspecting and warehousing: drying the parts obtained by the treatment in the step 7), inspecting according to the QJ487 standard, and packaging qualified parts for storage.
2. The method for preventing the GBn167 material from blackening after conductive oxidation according to claim 1, wherein the total organic solution in the step 1) comprises the following components by mass percent: 10-15% of water-based cleaning agent and 85-90% of water.
3. The method for preventing the GBn167 material from blackening after conductive oxidation according to claim 1, wherein the mass concentration of the NaOH solution in the step 2) is 20-35 g/L, and the alkaline etching temperature is 60 ℃ or 65 ℃.
4. The method of claim 1, wherein the step 3) of HNO prevents blackening of GBn167 material after conductive oxidation3The mass concentration of the solution is 15-30%.
5. The method of claim 1, wherein the step 5) comprises using water as solvent, chromic anhydride, potassium ferricyanide, sodium fluoride, and slow release agent as solute, wherein CrO 167 is selected from the group consisting of chromium oxide, potassium ferricyanide, sodium fluoride, and mixtures thereof33.0～10.0g/L、NaF 0.7～1.5g/L、K3Fe(CN)60.3-1.0 g/L, and 0.2-0.5 g/L of slow release agent.
6. The method of claim 1, wherein the conductive oxidation is performed under the following conditions: the current density is 1.0-2.5A/dm2The temperature is 25-45 ℃, and the oxidation time is 0.5-1.5 min.
7. The method for preventing the GBn167 material from blackening after conducting oxidation according to claim 1, wherein the working conditions of the solid film in the step 6) are as follows: the temperature is 40-50 ℃ and the time is 30-60 s.
8. The method for preventing the GBn167 material from blackening after conductive oxidation according to claim 1, wherein the drying temperature in step 7) is 40-50 ℃ and the drying time is 10-15 min.
9. The method of claim 1, wherein the GBn167 material has a chemical cost in mass percent as follows: 0.30% of Si, 0.30% of Fe, 6.0-7.0% of Cu, 0.40-0.8% of Mn, 0.05% of Mg, 0.10% of Zn, 0.10-0.20% of Ti and the balance of Al.
10. The method of claim 1, wherein the acceptable part has a tensile strength σ b (MPa) of 355 or more and a yield strength σ 0.2(MPa) of 235 or more.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400127A (en) * | 2011-11-07 | 2012-04-04 | 郑州飞机装备有限责任公司 | Chemical oxidation method of surfaces of aluminum and aluminum alloys |
| CN103498180A (en) * | 2013-08-23 | 2014-01-08 | 北京星航机电装备有限公司 | Environment-friendly anodic oxidation pretreatment process |
| US20190316269A1 (en) * | 2018-04-12 | 2019-10-17 | Citic Dicastal Co., Ltd | Method for ceramization of aluminum alloy surface |
| CN111501078A (en) * | 2020-06-22 | 2020-08-07 | 清远市海轩铝业金属制品有限公司 | Non-ferrous metal surface treatment method |
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- 2021-11-09 CN CN202111322537.6A patent/CN114032597A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400127A (en) * | 2011-11-07 | 2012-04-04 | 郑州飞机装备有限责任公司 | Chemical oxidation method of surfaces of aluminum and aluminum alloys |
| CN103498180A (en) * | 2013-08-23 | 2014-01-08 | 北京星航机电装备有限公司 | Environment-friendly anodic oxidation pretreatment process |
| US20190316269A1 (en) * | 2018-04-12 | 2019-10-17 | Citic Dicastal Co., Ltd | Method for ceramization of aluminum alloy surface |
| CN111501078A (en) * | 2020-06-22 | 2020-08-07 | 清远市海轩铝业金属制品有限公司 | Non-ferrous metal surface treatment method |
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