CN210420210U - Coating structure sealed by cyanide-free cadmium-titanium alloy and graphene of aerospace fastener - Google Patents
Coating structure sealed by cyanide-free cadmium-titanium alloy and graphene of aerospace fastener Download PDFInfo
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- CN210420210U CN210420210U CN201920691792.XU CN201920691792U CN210420210U CN 210420210 U CN210420210 U CN 210420210U CN 201920691792 U CN201920691792 U CN 201920691792U CN 210420210 U CN210420210 U CN 210420210U
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- -1 cadmium-titanium Chemical compound 0.000 title claims abstract description 67
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 52
- 239000000789 fastener Substances 0.000 title claims abstract description 28
- 229910021389 graphene Inorganic materials 0.000 title claims description 44
- 239000011248 coating agent Substances 0.000 title claims description 22
- 238000000576 coating method Methods 0.000 title claims description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 16
- 238000002161 passivation Methods 0.000 claims abstract description 36
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 24
- 239000011651 chromium Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 22
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 33
- 238000007747 plating Methods 0.000 claims description 30
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 18
- 239000001103 potassium chloride Substances 0.000 claims description 9
- 235000011164 potassium chloride Nutrition 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims description 8
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000009713 electroplating Methods 0.000 claims description 5
- 239000010410 layer Substances 0.000 abstract description 59
- KRVSOGSZCMJSLX-UHFFFAOYSA-L Chromic acid Chemical compound O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 6
- 229910002804 graphite Inorganic materials 0.000 abstract description 6
- 239000010439 graphite Substances 0.000 abstract description 6
- 238000005253 cladding Methods 0.000 abstract description 5
- 150000003839 salts Chemical class 0.000 abstract description 3
- 239000011780 sodium chloride Substances 0.000 abstract description 3
- 239000011229 interlayer Substances 0.000 abstract description 2
- 230000001264 neutralization Effects 0.000 abstract description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 27
- 239000003795 chemical substances by application Substances 0.000 description 17
- 238000005406 washing Methods 0.000 description 17
- 239000000243 solution Substances 0.000 description 9
- 238000005238 degreasing Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- WGLPBDUCMAPZCE-UHFFFAOYSA-N trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 4
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 150000003608 titanium Chemical class 0.000 description 3
- VZCYOOQTPOCHFL-OWOJBTEDSA-N (E)-but-2-enedioate;hydron Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- YKYOUMDCQGMQQO-UHFFFAOYSA-L Cadmium chloride Chemical compound Cl[Cd]Cl YKYOUMDCQGMQQO-UHFFFAOYSA-L 0.000 description 2
- RGHNJXZEOKUKBD-SQOUGZDYSA-N Gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 2
- 239000004698 Polyethylene (PE) Substances 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N Silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K [O-]P([O-])([O-])=O Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000005282 brightening Methods 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- 238000005039 chemical industry Methods 0.000 description 2
- PHFQLYPOURZARY-UHFFFAOYSA-N chromium trinitrate Chemical compound [Cr+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PHFQLYPOURZARY-UHFFFAOYSA-N 0.000 description 2
- 229940117975 chromium trioxide Drugs 0.000 description 2
- 239000008139 complexing agent Substances 0.000 description 2
- 238000006356 dehydrogenation reaction Methods 0.000 description 2
- IPLMNKLLGMDMKO-UHFFFAOYSA-J diazanium;cerium(4+);trisulfate Chemical compound [NH4+].[NH4+].[Ce+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O IPLMNKLLGMDMKO-UHFFFAOYSA-J 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N iso-propanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L na2so4 Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- HCJTYESURSHXNB-UHFFFAOYSA-N propynamide Chemical compound NC(=O)C#C HCJTYESURSHXNB-UHFFFAOYSA-N 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000011775 sodium fluoride Substances 0.000 description 2
- 235000013024 sodium fluoride Nutrition 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- AUIXNZFZSGLHKP-UHFFFAOYSA-M sodium;2,3-dimethylbenzenesulfonate Chemical compound [Na+].CC1=CC=CC(S([O-])(=O)=O)=C1C AUIXNZFZSGLHKP-UHFFFAOYSA-M 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N 1,2-ethanediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- LGAVZSDGTHBNKW-UHFFFAOYSA-N 1-[2-aminoethyl(2-hydroxyethyl)amino]propan-2-ol Chemical compound CC(O)CN(CCN)CCO LGAVZSDGTHBNKW-UHFFFAOYSA-N 0.000 description 1
- 241000251468 Actinopterygii Species 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N Malic acid Chemical compound OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-XIXRPRMCSA-N Mesotartaric acid Chemical compound OC(=O)[C@@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-XIXRPRMCSA-N 0.000 description 1
- ZUHZZVMEUAUWHY-UHFFFAOYSA-N N,N-dimethylpropan-1-amine Chemical compound CCCN(C)C ZUHZZVMEUAUWHY-UHFFFAOYSA-N 0.000 description 1
- 229940051841 POLYOXYETHYLENE ETHER Drugs 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- 230000000240 adjuvant Effects 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229960004106 citric acid Drugs 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N fumaric acid Chemical compound OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 239000000174 gluconic acid Substances 0.000 description 1
- 235000012208 gluconic acid Nutrition 0.000 description 1
- 229950006191 gluconic acid Drugs 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 229940099690 malic acid Drugs 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920000056 polyoxyethylene ether Polymers 0.000 description 1
- 230000002035 prolonged Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- DGSDBJMBHCQYGN-UHFFFAOYSA-M sodium;2-ethylhexyl sulfate Chemical compound [Na+].CCCCC(CC)COS([O-])(=O)=O DGSDBJMBHCQYGN-UHFFFAOYSA-M 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 229960001367 tartaric acid Drugs 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Abstract
The utility model discloses a cyanide-free cadmium titanium alloy and graphite alkene confined cladding layer structure of aerospace fastener, including metal base member the last cyanide-free cadmium titanium alloy cladding layer, the low chromium color passivation layer of chromate, the nanometer hydroxyl graphite alkene confined layer that prepare in proper order from inside to outside of metal base member. The utility model provides a no cyanogen cadmium titanium alloy and graphite alkene confined cladding layer structure have higher corrosion resistance than the interlayer structure that plates that prior art prepared, carry out neutral salt fog test 4500h according to GB/T10125 + 2012 "artificial atmosphere corrosion test salt fog test", plate a surface and do not have the white rust and generate. The utility model discloses a chromate low chromium color passivation technology solves the high pollution problem of high chromic acid passivation, uses the seal layer that nanometer graphite alkene closed process prepared, has excellent corrosion resistance, lubricity and wearability, can reduce the risk that the passive film was scratched when the assembly of aerospace fastener, prolongs the life of equipment.
Description
Technical Field
The utility model belongs to the metal plating field, concretely relates to aerospace fastener's cyanide-free cadmium titanium alloy and graphite alkene confined cladding material structure.
Background
For aerospace fasteners with high corrosion resistance requirements, protective layers are generally prepared by adopting a cadmium-plated and high-chromic-acid color-passivated coating structure, and most aerospace enterprises adopt the traditional cyanide cadmium-plated and high-chromic-acid passivation process to produce the fasteners at present. The coating structure of the aerospace fastener prepared by the prior art is not high enough in scratch resistance, the aerospace fastener is easy to scratch in assembly, and the scratched fastener can be corroded at a high speed, so that potential safety hazards exist in aerospace equipment. Hexavalent chromium is used in the high-chromic acid color passivation process, has high toxicity, causes serious harm to the environment and the health of operators, and a large amount of hexavalent chromium is brought into wastewater in the passivation production, thereby increasing a large burden on wastewater treatment.
The method provides a plating layer with high compactness and excellent corrosion resistance, and the production process of the plating layer is a development trend for environmental friendliness.
SUMMERY OF THE UTILITY MODEL
In order to solve the high risk problem that the cadmium-plated layer of aerospace fastener adopts the colored passivation of high chromic acid high pollution, fastener by the fish tail when the assembly, the utility model provides a cyanide-free cadmium titanium alloy and graphite alkene confined cladding layer structure of aerospace fastener.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the cyanide-free cadmium-titanium alloy and graphene enclosed plating layer structure of the aerospace fastener comprises a metal base body, a cyanide-free cadmium-titanium alloy plating layer, a chromate low-chromium color passivation layer and a nano hydroxyl graphene enclosed layer, wherein the cyanide-free cadmium-titanium alloy plating layer, the chromate low-chromium color passivation layer and the nano hydroxyl graphene enclosed layer are sequentially prepared on the metal base body from inside to outside.
Furthermore, the thickness of the cyanide-free cadmium titanium alloy coating is 8-24 μm.
Furthermore, the thickness of the cyanide-free cadmium titanium alloy plating layer is 10-12 mu m.
Further, the cyanide-free cadmium titanium alloy plating layer is prepared by adopting a potassium chloride cyanide-free cadmium titanium alloy electroplating process;
the plating solution used in the potassium chloride cyanide-free cadmium titanium alloy electroplating process comprises the following components: cadmium chloride, potassium chloride, a coordination agent, sodium fluoride, a titanium salt supply agent, a brightening agent, an auxiliary agent and a displacement agent.
Furthermore, the thickness of the chromate low-chromium color passivation layer is 0.3-0.5 μm.
Further, the chromate low-chromium color passivation layer is prepared by adopting a rare earth modified chromate passivation process;
the passivating solution applied to the rare earth modified chromate passivating process comprises the following components: chromium trioxide, ammonium ceric sulfate, anhydrous sodium sulfate, nitric acid and chromium nitrate nonahydrate.
Further, the thickness of the nano-hydroxyl graphene sealing layer is 0.3-1.5 mu m.
Further, the thickness of the nano-hydroxyl graphene sealing layer is 0.5-0.8 μm.
Further, the nano-hydroxyl graphene sealing layer is prepared by adopting a nano-hydroxyl graphene sealing process;
the sealing liquid applied to the nano-hydroxyl graphene sealing process comprises the following components: silica sol, water-soluble silane polymer, nano-level hydroxyl graphene solution, an organic silicon defoaming agent, an organic silicon flatting agent and deionized water.
Further, the metal matrix is a steel matrix or a copper-zinc alloy matrix.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model provides a cyanide-free cadmium titanium alloy and graphene closed plating layer structure of aerospace fastener, which adopts potassium chloride cyanide-free cadmium titanium alloy plating layer to replace the plating interlayer prepared by the prior art, and can greatly improve the corrosion resistance of the plating layer;
2. in the production, the chromate low-chromium color passivation layer is adopted to replace the traditional high-chromic acid color passivation layer, so that the traditional high-chromic acid color passivation process can be avoided, and the harm of hexavalent chromium to the environment and the health of operators is obviously reduced;
3. by adopting the nano-hydroxyl graphene sealing process, the potassium chloride cyanide-free cadmium-free titanium alloy coating can be efficiently sealed, and the lubricity and the wear resistance of the coating are remarkably improved, so that the scratch resistance of the aerospace fastener is improved, and the service life of the aerospace fastener is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, do not constitute a limitation of the invention, and in which:
FIG. 1 is a schematic diagram of the structure of the coating layer of the present invention.
Detailed Description
The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided to explain the invention, but not to limit the invention.
Example 1:
as shown in fig. 1, a coating structure for an aerospace fastener, which is sealed by a cyanide-free cadmium titanium alloy and graphene, includes a steel substrate 1, a cyanide-free cadmium titanium alloy coating 2 prepared on the surface of the steel substrate 1, a chromate low-chromium color passivation layer 3 prepared on the cyanide-free cadmium titanium alloy coating 2, and a nano-hydroxy graphene sealing layer 4 prepared on the chromate low-chromium color passivation layer 3.
The thickness of the cyanide-free cadmium titanium alloy coating 2 is 10-12 mu m, the cyanide-free cadmium titanium alloy coating is prepared by adopting a potassium chloride cyanide-free cadmium titanium alloy electroplating process developed by the ultra-nation chemical industry, and the process parameters are as follows: 30g/L of cadmium chloride, 120g/L of coordination agent, 160g/L of potassium chloride, 3g/L of sodium fluoride, 3mL/L of titanium salt replenishing agent, 2mL/L of brightening agent, 30mL/L of auxiliary agent, 10mL/L of displacement agent, 6.5-7.5 of pH value of plating solution, 20-35 ℃ of plating bath temperature and 0.5-2A/dm of cathode current density2The area ratio of the cathode to the anode is 1: 1, and the anode is a cadmium plate with the cadmium content being more than or equal to 99.97 percent.
The dislocation agent contains water-soluble propargylamide polymer with the mass concentration of 8-12 g/L, sodium dimethylbenzenesulfonate with the mass concentration of 50-80 g/L and polyethylene oxide ether phosphate with the product type of PE 600 of 80-120 mL/L. Adding 8-12 g of water-soluble propargylamide polymer, 50-80 g of sodium dimethylbenzenesulfonate and 80-120 mL of polyoxyethylene ether phosphate with the product model being PE 600 into 500mL of water, uniformly stirring, and adding water to 1000 mL.
The complexing agent consists of A, B, C components, wherein the component A is nitrilotriacetic acid, the component B is one or two of citric acid, tartaric acid, gluconic acid and malic acid, the component C is one or two of malonic acid, maleic acid, fumaric acid and oxalic acid, and the complexing agent is prepared according to the following proportion: A. 300-400 g, B350-450 g, C250-350 g, adding into a container, stirring and mixing evenly.
The brightener is prepared by adding 300mL of isopropanol into 400mL of water and uniformly mixing, dissolving D, E and F components into a mixed solution of isopropanol and water according to 50-60 g, 35-45 g and 70-90 g respectively, and adding water to 1000 mL.
The adjuvant is prepared by the following method: 60-70G of water-soluble polyacrylamide with the type of IC113, 30-40G of condensation compound consisting of ethylenediamine, dimethylpropylamine and epichlorohydrin, 50-60G of 2-ethylhexyl sulfate sodium salt, 15-25G N, N, N-tris (2-hydroxypropyl) -N' -hydroxyethyl ethylenediamine and 40-50G G components (the component G is consistent with the component F in the brightener) are added into 700G of water, stirred to be dissolved, and then the water is added to 1000 mL.
The titanium salt replenishing agent is an aqueous solution of potassium fluotitanate, 2g of potassium fluotitanate is dissolved in 800mL of water, and water is added to the solution until the volume is 1000 mL.
The thickness of the chromate low-chromium color passivation layer is 0.3-0.5 mu m, the chromate low-chromium color passivation layer is prepared by adopting a rare earth modified chromate passivation process developed by the ultra-nation chemical industry, and the process parameters are as follows: 5g/L of chromium trioxide, 0.5g/L of ammonium ceric sulfate, 1g/L of anhydrous sodium sulfate, 3mL/L of 65-68% nitric acid and 2g/L of chromium nitrate nonahydrate; and passivating the plated part in the passivation solution for 5-15 s at room temperature.
The thickness of the nano-hydroxyl graphene sealing layer is 0.5-0.8 mu m, and the nano-hydroxyl graphene sealing layer is prepared by adopting a nano-hydroxyl graphene sealing process;
the sealing agent applied to the nano-hydroxyl graphene sealing process comprises the following components in parts by weight: 25 parts of silica sol, 25 parts of PU 113 water-soluble silane polymer, 5 parts of nano-grade hydroxyl graphene with the mass fraction of 4%, 0.5 part of TANAOAMS (organic silicon foam agent) organic silicon defoamer produced by Dutch Tuona, 1 part of LA13-863 organic silicon leveling agent produced by Dutch Stall and 40 parts of deionized water.
And diluting the sealant by 3 times with deionized water to prepare a sealing solution, dipping the plated part in the sealing solution, taking out and drying to form a sealing layer.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the iron and steel component substrate 1 is subjected to the steps of "alkaline chemical degreasing → water washing → alkaline anodic electrolytic degreasing → water washing → acid washing → water washing → cathodic electrolytic degreasing → water washing → activation → water washing".
2. Cyanide-free cadmium titanium alloy plating layer 2: after the pretreatment of the steel part, the cyanide-free cadmium titanium alloy is plated → the water washing → the drying → the dehydrogenation is carried out to prepare the cyanide-free cadmium titanium alloy plating layer 2.
3. Chromate low-chromium color passivation layer 3: the cyanide-free cadmium titanium alloy coating 2 is subjected to '2% nitric acid light extraction → water washing → rare earth modified chromate low-chromium color passivation → water washing' to prepare the chromate low-chromium color passivation layer 3.
4. Nano-hydroxyl graphene sealing layer 4: and (3) passivating the plated part, and then soaking in nano-hydroxy graphene sealing liquid → dripping to dry → blowing off the sealing liquid remained at the bottom of the plated part → baking at 70-90 ℃ to prepare the nano-hydroxy graphene sealing layer 4.
Example 2:
as shown in fig. 1, a coating structure for an aerospace fastener, which is sealed by a cyanide-free cadmium titanium alloy and graphene, comprises a copper-zinc alloy matrix 1, a cyanide-free cadmium titanium alloy coating 2, a chromate low-chromium color passivation layer 3 and a nano-hydroxyl graphene sealing layer 4, wherein the cyanide-free cadmium titanium alloy coating 2, the chromate low-chromium color passivation layer 3 and the nano-hydroxyl graphene sealing layer are sequentially prepared on the surface of the copper-zinc alloy matrix 1 from inside to outside.
The cyanide-free cadmium-free titanium alloy plating layer 2 is prepared by adopting the same potassium chloride cyanide-free cadmium titanium alloy electroplating process as that in the embodiment 1, and the thickness of the plating layer is 8-10 mu m.
The chromate low-chromium color passivation layer 3 is prepared by adopting the same rare earth modified chromate low-chromium color passivation process as that in the embodiment 1, and the thickness of the passivation layer is 0.3-0.5 mu m.
The sealing layer 4 is prepared from the same nano-hydroxyl graphene sealing liquid as in the embodiment 1, and the thickness of the sealing layer is 0.5-0.8 μm.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the copper-zinc alloy component substrate 1 is subjected to the steps of "alkaline chemical degreasing → washing with water → acid washing → washing with water → cathodic electrolytic degreasing → washing with water → activation → washing with water".
2. Cyanide-free cadmium titanium alloy plating layer 2: after the copper-zinc alloy parts are pretreated, the cyanide-free cadmium-titanium alloy is plated → the water washing → the drying → the dehydrogenation is carried out to prepare the cyanide-free cadmium-titanium alloy plating layer 2.
3. Chromate low-chromium color passivation layer 3: the cyanide-free cadmium titanium alloy coating 2 is subjected to '2% nitric acid light extraction → water washing → rare earth modified chromate low-chromium color passivation → water washing' to prepare the chromate low-chromium color passivation layer 3.
4. Nano-hydroxyl graphene sealing layer 4: and (3) passivating the plated part, and then soaking nano hydroxyl graphene sealing liquid → dripping → blowing off the sealing agent remained at the bottom of the plated part → baking at 70-90 ℃ to prepare the nano hydroxyl graphene sealing layer 4.
By adopting the coating structure sealed by the cyanide-free cadmium titanium alloy and the graphene prepared in the embodiments 1 and 2, a neutral salt spray test 4500h is carried out according to GB/T10125-.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the description should not be construed as a limitation to the present invention.
Claims (9)
1. The cyanide-free cadmium titanium alloy and graphene closed plating layer structure of the aerospace fastener is characterized in that: the metal base body is sequentially provided with a cyanide-free cadmium-titanium alloy coating, a chromate low-chromium color passivation layer and a nano hydroxyl graphene sealing layer from inside to outside.
2. The aerospace fastener closed plating structure of cyanide-free titanium alloy and graphene as claimed in claim 1, wherein: the thickness of the cyanide-free cadmium-titanium alloy coating is 8-24 mu m.
3. The aerospace fastener coating structure with a cyanide-free titanium alloy and graphene closure as claimed in claim 2, wherein: the thickness of the cyanide-free cadmium-titanium alloy coating is 10-12 mu m.
4. The aerospace fastener plating structure with a cyanide-free titanium alloy and graphene closure as claimed in claim 1 or 2, wherein: the cyanide-free cadmium titanium alloy plating layer is prepared by adopting a potassium chloride cyanide-free cadmium titanium alloy electroplating process.
5. The aerospace fastener closed plating structure of cyanide-free titanium alloy and graphene as claimed in claim 1, wherein: the thickness of the chromate low-chromium color passivation layer is 0.3-0.5 mu m.
6. The aerospace fastener plating structure with a cyanide-free titanium alloy and graphene closure as claimed in claim 1 or 5, wherein: the chromate low-chromium color passivation layer is prepared by adopting a rare earth modified chromate passivation process.
7. The aerospace fastener closed plating structure of cyanide-free titanium alloy and graphene as claimed in claim 1, wherein: the thickness of the nano-hydroxyl graphene sealing layer is 0.3-1.5 mu m.
8. The aerospace fastener plating structure with a cyanide-free titanium alloy and graphene closure as claimed in claim 1 or 7, wherein: the nano-hydroxyl graphene sealing layer is prepared by adopting a nano-hydroxyl graphene sealing process.
9. The aerospace fastener closed plating structure of cyanide-free titanium alloy and graphene as claimed in claim 1, wherein: the metal matrix is a steel matrix or a copper-zinc alloy matrix.
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