CN219951216U - Plating layer structure of galvanized nickel alloy of aerospace aluminum alloy accessory - Google Patents
Plating layer structure of galvanized nickel alloy of aerospace aluminum alloy accessory Download PDFInfo
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- CN219951216U CN219951216U CN202321111034.9U CN202321111034U CN219951216U CN 219951216 U CN219951216 U CN 219951216U CN 202321111034 U CN202321111034 U CN 202321111034U CN 219951216 U CN219951216 U CN 219951216U
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- aluminum alloy
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- 238000007747 plating Methods 0.000 title claims abstract description 134
- 229910000990 Ni alloy Inorganic materials 0.000 title claims abstract description 50
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 16
- 239000000956 alloy Substances 0.000 title claims abstract description 16
- 229910001095 light aluminium alloy Inorganic materials 0.000 title claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 72
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical class [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000007789 sealing Methods 0.000 claims abstract description 44
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 29
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 29
- 238000002161 passivation Methods 0.000 claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 92
- 229910052759 nickel Inorganic materials 0.000 claims description 44
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 32
- 229910052725 zinc Inorganic materials 0.000 claims description 32
- 239000011701 zinc Substances 0.000 claims description 32
- 239000003795 chemical substances by application Substances 0.000 claims description 25
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 239000011159 matrix material Substances 0.000 claims description 8
- -1 hydroxyl graphene Chemical compound 0.000 claims description 7
- 230000008021 deposition Effects 0.000 claims description 4
- 239000010410 layer Substances 0.000 abstract description 91
- 230000007797 corrosion Effects 0.000 abstract description 17
- 238000005260 corrosion Methods 0.000 abstract description 17
- 238000012360 testing method Methods 0.000 abstract description 14
- 239000000758 substrate Substances 0.000 abstract description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 150000003839 salts Chemical class 0.000 abstract description 6
- 239000007921 spray Substances 0.000 abstract description 6
- 230000007935 neutral effect Effects 0.000 abstract description 3
- 238000010998 test method Methods 0.000 abstract description 3
- 239000003518 caustics Substances 0.000 abstract description 2
- 239000011247 coating layer Substances 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 238000005406 washing Methods 0.000 description 18
- 229910001250 2024 aluminium alloy Inorganic materials 0.000 description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 238000001556 precipitation Methods 0.000 description 12
- 239000000654 additive Substances 0.000 description 11
- 230000000996 additive effect Effects 0.000 description 11
- 229910052793 cadmium Inorganic materials 0.000 description 9
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 9
- 238000000151 deposition Methods 0.000 description 9
- 239000007788 liquid Substances 0.000 description 9
- 238000009713 electroplating Methods 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000013589 supplement Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 239000002585 base Substances 0.000 description 4
- 238000005238 degreasing Methods 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000007865 diluting Methods 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000000565 sealant Substances 0.000 description 3
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 2
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910001431 copper ion Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 239000012629 purifying agent Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 description 1
- BIABJQLRIVAXSJ-UHFFFAOYSA-N aluminum;tricyanide Chemical compound [Al+3].N#[C-].N#[C-].N#[C-] BIABJQLRIVAXSJ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- NHMJUOSYSOOPDM-UHFFFAOYSA-N cadmium cyanide Chemical compound [Cd+2].N#[C-].N#[C-] NHMJUOSYSOOPDM-UHFFFAOYSA-N 0.000 description 1
- 238000005234 chemical deposition Methods 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Chemically Coating (AREA)
Abstract
The utility model discloses a plating structure of a zinc-nickel alloy plating layer of an aerospace aluminum alloy accessory, which comprises an aluminum alloy substrate, and a chemical zinc-deposition layer, a chemical nickel-pre-plating layer, a chemical nickel-plating layer, a zinc-nickel alloy plating layer, a hexavalent chromium black passivation layer and a graphene sealing layer which are sequentially prepared on the aluminum alloy substrate from inside to outside. The zinc-nickel alloy plating layer structure is evaluated according to GB/T5270-2005 test method of adhesion strength of electrodeposited and chemically deposited metal coating layer on metal substrate, the bonding force of the plating layer is measured by a thermal shock test method, and the measurement result meets the standard requirement. According to GB/T10125-2021 Standard test corrosion resistance of salt spray test of artificial atmosphere corrosion test, the plating part is subjected to neutral salt spray test for 1000 hours, white corrosive substances are not generated on the surface of the plating part, and the corrosion resistance of the plating layer meets the special requirements of aerospace accessories. The preparation process is environment-friendly and has good market prospect.
Description
Technical Field
The utility model belongs to the field of metal electroplating, and particularly relates to a plating structure of a zinc-nickel alloy plating layer of an aerospace aluminum alloy accessory.
Background
The cyanide-free cadmium plating is used for replacing the cyanide cadmium plating in the field of aerospace in China, so that a great deal of application is realized, and the use of cyanide and the pollution of the cyanide to the environment are effectively reduced. However, the pollution problem of cadmium is still serious, and although the current cyanide-free cadmium plating wastewater treatment technology is mature, the cadmium ions have high toxicity, and the cadmium remained in the treated wastewater still causes pollution to the environment. Aerospace electrical fittings are typically made from aluminum alloys, and cadmium plating layers are typically prepared on aluminum alloy fittings. In order to reduce cadmium pollution, new processes are being developed to replace cadmium plating with zinc-nickel alloy plating. This process is typically performed by sequentially electroless zinc deposition, electroless nickel plating, electrogalvanized nickel alloy plating, and chromate passivation on an aluminum alloy substrate. The development and research of hexavalent chromium passivation technology of zinc-nickel alloy plating are carried out for many years, but the technology is still not mature, and more intensive research is needed.
The Chinese patent of the utility model of the hydroxyl graphene modified coating sealing agent and the preparation method thereof, which are issued with the publication number CN 108129885B, discloses a coating sealing agent, and has good benefits in the fields of aerospace, automobile manufacturing and the like. The hydroxyl graphene has the oxidizing property similar to hexavalent chromium, and can react with plating metal to form a new passivation film after the passivation film of the plating is damaged. After the sealing layer is dried and solidified, a certain amount of active groups still exist in the silane polymer molecules, and after the sealing layer is damaged, the silane polymer can be spontaneously crosslinked together to form a new sealing layer. Thus, with hydroxy graphiteThe blocking layer prepared by the alkene modified blocking agent has self-repairing property [1] The zinc-nickel alloy plating layer is sealed by the sealing device, so that the service life of a plating piece can be obviously prolonged.
Reference is made to: [1] guo Chongwu, laimen, xia Liang, performance study of graphene oxide in coating sealants [ J ], electroplating and finishing, 2021, 40 (9): 696-700.
Disclosure of Invention
The utility model provides a plating structure of a galvanized nickel alloy of an aerospace aluminum alloy fitting, which aims to solve the problem of high pollution of cadmium plating of the aerospace aluminum alloy fitting. In order to achieve the above purpose, the utility model adopts the following technical scheme:
the plating layer structure of the galvanized nickel alloy of the aerospace aluminum alloy accessory comprises an aluminum alloy matrix, and a chemical zinc deposition layer, a chemical nickel pre-plating layer, a chemical nickel plating layer, a zinc nickel alloy plating layer, a hexavalent chromium black passivation layer and a graphene sealing layer which are sequentially prepared on the aluminum alloy matrix from inside to outside;
the graphene sealing layer is prepared by adopting a hydroxyl graphene modified coating sealing agent;
the thickness of the graphene sealing layer is 0.8-2.2 mu m.
Preferably, the thickness of the chemical nickel plating layer is 0.3-1 μm.
Preferably, the thickness of the electroless nickel plating layer is 3-10 μm.
Preferably, the thickness of the zinc-nickel alloy plating layer is 8-20 mu m.
Preferably, the thickness of the hexavalent chromium black passivation layer is 0.3-0.5 μm.
Compared with the prior art, the utility model has the following beneficial effects:
1. the plating structure of the zinc-nickel alloy plating of the aerospace aluminum alloy accessory disclosed by the utility model uses a zinc-nickel alloy plating process to replace the existing cadmium plating process, so that the problem of high pollution of cadmium ions is solved;
2. according to the plating layer structure of the galvanized nickel alloy of the aerospace aluminum alloy accessory, the zinc nickel alloy plating layer which is subjected to hexavalent chromium black passivation is sealed by the hydroxyl graphene modified plating layer sealing agent, so that the corrosion resistance of the plating layer is remarkably improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and constitute a part of this specification, are incorporated in and constitute a part of this specification and do not limit the utility model in any way, and in which:
fig. 1 is a schematic diagram of the plating structure of examples 1 and 2 of the present utility model.
Description of the embodiments
The present utility model will now be described in detail with reference to the drawings and the specific embodiments thereof, wherein the exemplary embodiments and descriptions of the present utility model are provided for illustration of the utility model and are not intended to be limiting.
The aluminum alloy fittings are subjected to oil removal, alkali corrosion, light emission, deslagging and micro corrosion activation according to the existing pretreatment process.
And preparing a electroless zinc plating layer by adopting the existing electroless zinc plating process of the aluminum alloy after the pretreatment of the aluminum alloy fittings.
Preferably, the electroless zinc plating layer is prepared by adopting an ALBUME AS-699 cyanide-free aluminum electroless zinc plating process of the super-bonding chemical industry:
ALBUME AS-699 non-cyanide aluminum zinc-depositing agent 140-180 mL/L, working temperature 20-30 ℃ and zinc-depositing time 60-120 s; the zinc precipitating agent contains 6-9 g/L zinc ions and 0.16-0.20 g/L copper ions.
Preferably, the chemical zinc precipitation layer is prepared by adopting an AZIN-113 acidic aluminum upper zinc precipitation process in the super-bonding chemical industry:
150-250 mL/L of AZIN-113 acid aluminum zinc precipitation agent, the working temperature is 15-30 ℃, the pH range is 3.4-4.5, and the zinc precipitation time is 30-90 s.
After the aluminum alloy fitting is subjected to chemical zinc precipitation, a chemical nickel plating layer is prepared by adopting the existing low-temperature chemical nickel plating process.
Preferably, the thickness of the chemical nickel plating layer is 0.3-1 μm.
Preferably, the chemical nickel pre-plating layer is prepared by adopting GG-178 alkaline chemical nickel plating technology of super-bonding chemical industry:
25-50 mL/L of GG-178A additive, 25-40 mL/L of GG-178B reducer, 30-60 mL/L of GG-178C stabilizer, and the operating temperature is 25-38 ℃, and the pH range of the plating solution is 8.5-9.5.
Preferably, the chemical nickel pre-plating layer is prepared by adopting GG-158 alkaline chemical nickel plating technology of super-bonding chemical industry:
140-160 mL/L of GG-158A cylinder opener, 90-110 mL/L of GG-158B supplement and 90-110 mL/L of GG-158C supplement, the operating temperature is 30-45 ℃, and the pH range of plating solution is 7.5-8.5.
After the chemical nickel plating of the aluminum alloy fittings, the chemical nickel plating layer is prepared by adopting the existing high-temperature chemical nickel plating process.
Preferably, the thickness of the electroless nickel plating layer is 3-10 μm.
Preferably, the chemical nickel plating layer is prepared by adopting GG-166 high-phosphorus chemical nickel plating technology of super-bonding chemical industry:
GG-166A additive 55-65 mL/L, GG-178B reducer GG-166B 170-190 mL/L, operating temperature 85-92 ℃ and plating solution pH range 4.6-5.2.
After the aluminum alloy fitting is subjected to chemical nickel plating, a zinc-nickel alloy plating layer is prepared by adopting the current zinc-nickel alloy plating process.
Preferably, the thickness of the zinc-nickel alloy plating layer is 8-20 mu m.
Preferably, the zinc-nickel alloy plating layer is prepared by adopting a Detronzin 1215 alkaline zinc-nickel alloy electroplating process in the super-bonding chemical industry:
5.5 to 8.5g/L of zinc, 1.0 to 1.8g/L of nickel (provided by 13 to 22mL/L of DETRONZIN 1215 Ni nickel supplement), 120 to 135g/L of sodium hydroxide, 90 to 110mL/L of DETRONZIN 1215 Base auxiliary, 1.0 to 5.0mL/L of DETRONZIN 1215 Brightener main gloss agent, 0.1 to 0.8mL/L of DETRONZIN 1215 Purifier R purifying agent, and a plating bath temperature of 21 to 28 ℃ and a cathode current density of 1.0 to 3.0A/dm 2 The cathode moves for 4-6 m/min.
Preferably, the zinc-nickel alloy plating layer is prepared by adopting a Detronzin 1315 alkaline zinc-nickel alloy electroplating process of the super-bonding chemical industry:
5-10 g/L zinc, 0.7-1.8 g/L nickel, 120-140 g/L sodium hydroxide, 70-100 mL/L DETRONZIN 1315 Base auxiliary agent, 10-25 mL/L DETRONZIN 1315 Ni zinc-nickel additive, DETRONZIN 1315 Brightener zinc-nickel main light agent 0.5-1.5 mL/L, DETRONZIN 1315 LCD zinc-nickel low area additive 0.5-1.5 mL/L, plating bath temperature 23-28 ℃, cathode current density 0.8-2.5A/dm 2 The cathode moves 3-5 m/min.
And preparing a hexavalent chromium black passivation layer by adopting the existing hexavalent chromium black passivation technology after the zinc-nickel alloy is electroplated on the aluminum alloy fitting.
Preferably, the thickness of the hexavalent chromium black passivation layer is 0.3-0.5 μm.
Preferably, the hexavalent chromium black passivation layer is prepared by adopting a 730 hexavalent chromium black passivation process in the super-bonding chemical industry:
730 120-160 mL/L of A zinc-nickel hexavalent chromium black passivating agent, 120-160 mL/L of 730B zinc-nickel hexavalent chromium black passivating agent, 20-25 ℃ of passivating temperature, 0.7-0.9 of pH range of passivating solution and 60-120 s of passivating time.
And preparing a graphene sealing layer by adopting a hydroxyl graphene modified coating sealing agent developed by super-bonding chemical industry after the hexavalent chromium of the aluminum alloy fitting is passivated.
Preferably, the thickness of the graphene sealing layer is 0.8-2.2 μm.
Preferably, the graphene sealing layer is prepared by adopting a PRODICO 480 graphene sealing process developed by super-nation chemical industry:
and diluting the PRODICO 480 graphene modified sealing agent with water to 2.5-3.5 times to prepare sealing liquid, immersing the plated part in the sealing liquid for 8-15 s, discharging the plated part out of the tank, dripping the plated part, blowing off the residual sealing liquid on the surface of the plated part by using high-pressure air, and drying and curing the plated part at 70-90 ℃ for 20-30 min after sealing.
Examples
As shown in fig. 1, the plating structure of the zinc-nickel alloy plating of the aerospace aluminum alloy accessory comprises an aluminum alloy matrix 1, and a chemical zinc-deposition layer 2, a chemical nickel-plating layer 3, a chemical nickel-plating layer 4, a zinc-nickel alloy plating layer 5, a hexavalent chromium black passivation layer 6 and a graphene sealing layer 7 which are sequentially prepared on the aluminum alloy matrix 1 from inside to outside; the aluminum alloy accessory is an aluminum alloy mechanical workpiece prepared by adopting 2024 aluminum alloy through mechanical processing.
1. Pretreatment:
the 2024 aluminum alloy mechanical workpiece substrate 1 is subjected to chemical degreasing, water washing, ultrasonic degreasing, water washing, alkali corrosion, water washing, light emitting, water washing, descaling, water washing, micro corrosion and water washing according to the existing aluminum alloy pretreatment process.
2. And (3) chemical zinc precipitation:
after the 2024 aluminum alloy mechanical processing piece is pretreated, an ALBUME AS-699 cyanide-free aluminum upper zinc deposition process of the super-bonding chemical industry is adopted to prepare the electroless zinc deposition layer 2.
ALBUME AS-699 cyanide-free aluminum zinc-depositing agent 150mL/L, working temperature 23 ℃ and zinc-depositing time 100s; the zinc precipitating agent contains 8g/L zinc ions and 0.18g/L copper ions. The specific process flow is as follows:
first zinc precipitation, water washing, zinc removal, water washing, second zinc precipitation and water washing.
3. Chemical nickel plating:
after zinc is chemically deposited on 2024 aluminum alloy machined parts, a GG-178 alkaline chemical nickel plating process of super-bonding chemical industry is adopted to prepare a chemical nickel pre-plating layer 3, and the thickness of the plating layer is 0.8 mu m.
42mL/L of GG-178A additive, 32mL/L of GG-178B reducer, 45mL/L of GG-178C stabilizer, and the operating temperature is 33 ℃, and the pH of the plating solution is 9.2.
4. Chemical nickel plating:
after the 2024 aluminum alloy machined part is subjected to chemical nickel plating, a GG-166 high-phosphorus chemical nickel plating process of the super-bonding chemical industry is adopted to prepare a chemical nickel plating layer 4, and the thickness of the plating layer is 6 mu m.
GG-166A additive 60mL/L, GG-166B additive 180mL/L, operating temperature 87 ℃, and plating solution pH 4.8.
5. Zinc-nickel alloy plating:
after the 2024 aluminum alloy machined part is subjected to chemical nickel plating, a Detronzin 1215 alkaline zinc-nickel alloy electroplating process of super-bonding chemical industry is adopted to prepare a zinc-nickel alloy plating layer 5, and the thickness of the plating layer is 12 mu m.
The Detronzin 1215 alkaline zinc-nickel alloy electroplating process comprises the following steps: 7g/L of zinc, 1.4g/L of nickel (provided by 16mL/L of DETRONZIN 1215 Ni nickel supplement), 130g/L of sodium hydroxide, 100mL/L of DETRONZIN 1215 Base adjuvant, 3.0mL/L of DETRONZIN 1215 Brightener main gloss agent, and 3.0mL/L of DETRONZIN 1215 Purifier R0.5mL/L of purifying agent, 25 ℃ of plating tank temperature and 2.5A/dm of cathode current density 2 The cathode was moved 5m/min.
6. Hexavalent chromium black passivation:
after the 2024 aluminum alloy mechanical processing piece is galvanized with nickel alloy, a 730 hexavalent chromium black passivation process in super-bonding chemical industry is adopted to prepare a hexavalent chromium black passivation layer 6, and the thickness of the passivation layer is 0.4 mu m.
730 130mL/L of A zinc-nickel hexavalent chromium black passivating agent, 150mL/L of 730B zinc-nickel hexavalent chromium black passivating agent, the passivating temperature is 23 ℃, the pH value of the passivating solution is 0.8, and the passivating time is 90s.
7. Closing:
after the 2024 aluminum alloy mechanical workpiece is passivated, a PRODICO 480 graphene sealing process developed by the super-nation chemical industry is adopted to prepare a graphene sealing layer 7, and the thickness of the sealing layer is 1.2 mu m.
And diluting the PRODICO 480 graphene modified sealing agent with water to 3 times to prepare sealing liquid, immersing the plating piece in the sealing liquid for 10s, taking out of the tank, dripping, blowing off the residual sealing liquid on the surface of the plating piece by using high-pressure air, and drying and curing for 30min at 75 ℃ after sealing.
Examples
As shown in fig. 1, the plating structure of the zinc-nickel alloy plating of the aerospace aluminum alloy accessory comprises an aluminum alloy matrix 1, and a chemical zinc-deposition layer 2, a chemical nickel-plating layer 3, a chemical nickel-plating layer 4, a zinc-nickel alloy plating layer 5, a hexavalent chromium black passivation layer 6 and a graphene sealing layer 7 which are sequentially prepared on the aluminum alloy matrix 1 from inside to outside; the aluminum alloy accessory is an aluminum alloy mechanical workpiece prepared by adopting 2024 aluminum alloy through mechanical processing.
1. Pretreatment:
the 2024 aluminum alloy mechanical workpiece substrate 1 is subjected to chemical degreasing, water washing, ultrasonic degreasing, water washing, alkali corrosion, water washing, light emitting, water washing, descaling, water washing, micro corrosion and water washing according to the existing aluminum alloy pretreatment process.
2. And (3) chemical zinc precipitation:
the 2024 aluminum alloy mechanical workpiece is prepared by adopting an AZIN-113 acidic aluminum upward zinc precipitation process of the super-bonding chemical industry after pretreatment:
AZIN-113 acid aluminium zinc-precipitating agent 200mL/L, working temperature 25 deg.C, pH 4.0, zinc-precipitating time 60s. The specific process flow is as follows:
first zinc precipitation, water washing, zinc removal, water washing, second zinc precipitation and water washing.
3. Chemical nickel plating:
after zinc is chemically deposited on 2024 aluminum alloy machined parts, the zinc is prepared by adopting a GG-158 alkaline chemical nickel plating process in super-bonding chemical industry:
GG-158 and A cylinder opener 150mL/L, GG-158 and B supplement 100mL/L and GG-158 and C supplement 100mL/L, the operating temperature is 35 ℃, and the pH of the plating solution is 8.2.
4. Chemical nickel plating:
after the 2024 aluminum alloy machined part is subjected to chemical nickel plating, a GG-166 high-phosphorus chemical nickel plating process of the super-bonding chemical industry is adopted to prepare a chemical nickel plating layer 4, and the thickness of the plating layer is 7 mu m.
GG-166A additive 63mL/L, GG-166B additive 175mL/L, operating temperature 90 ℃ and plating solution pH 5.0.
5. Zinc-nickel alloy plating:
after the 2024 aluminum alloy machined part is subjected to chemical nickel plating, a Detronzin 1315 alkaline zinc-nickel alloy electroplating process of super-bonding chemical industry is adopted to prepare a zinc-nickel alloy plating layer 5, and the thickness of the plating layer is 14 mu m.
8g/L of zinc, 1.3g/L of nickel, 130g/L of sodium hydroxide, 85mL/L of DETRONZIN 1315 Base auxiliary agent, 18mL/L of DETRONZIN 1315 Ni zinc-nickel additive, 1.2mL/L of DETRONZIN 1315 Brightener zinc-nickel main gloss agent, 1.2mL/L of DETRONZIN 1315 LCD zinc-nickel low area additive, plating bath temperature of 25 ℃ and cathode current density of 2.5A/dm 2 The cathode was moved 4m/min.
6. Hexavalent chromium black passivation:
after the 2024 aluminum alloy mechanical processing piece is galvanized with nickel alloy, a 730 hexavalent chromium black passivation process in super-bonding chemical industry is adopted to prepare a hexavalent chromium black passivation layer 6, and the thickness of the passivation layer is 0.4 mu m.
730 150mL/L of A zinc-nickel hexavalent chromium black passivating agent, 130mL/L of 730B zinc-nickel hexavalent chromium black passivating agent, the passivating temperature is 23 ℃, the pH value of the passivating solution is 0.8, the passivating time is 90s, the drying temperature is 60 ℃, and the drying time is 13min.
7. Closing:
after the 2024 aluminum alloy mechanical workpiece is passivated, a PRODICO 480 graphene sealing process developed by the super-nation chemical industry is adopted to prepare a graphene sealing layer 7, and the thickness of the sealing layer is 1.2 mu m.
And diluting the PRODICO 480 graphene modified sealing agent with water to 3 times to prepare sealing liquid, immersing the plating piece in the sealing liquid for 10s, taking out of the tank, dripping, blowing off the residual sealing liquid on the surface of the plating piece by using high-pressure air, and drying and curing at 80 ℃ for 25min after sealing.
Test example 1:
according to the technical process of the embodiment 1 and the embodiment 2, the aluminum alloy galvanized nickel alloy sample is prepared, the sample is placed in a heating furnace to be heated to 220 ℃ for 30min according to the standard of GB/T5270-2005 'test method for adhesion strength of a metal coating layer and a chemical deposition layer on a metal substrate', taken out and placed in water at room temperature for rapid cooling, no foaming and falling of a coating occur, and the prepared coating has good bonding force.
Test example 2:
according to the technical process of the embodiment 1 and the embodiment 2, an aluminum alloy galvanized nickel alloy sample is prepared, corrosion resistance is tested according to the standard of GB/T10125-2021 salt spray test for artificial atmosphere corrosion test, the surface of the sample is free from white corrosions after being subjected to a neutral salt spray test for 1000 hours, and the prepared coating has excellent corrosion resistance.
Comparative example 1:
the electroless zinc plating layer, electroless nickel plating layer, zinc-nickel alloy plating layer, and hexavalent chromium black passivation layer were sequentially prepared on the 2024 aluminum alloy machined piece by referring to the processes of examples 1 and 2, but were not sealed with a graphene modified sealant. According to GB/T10125-2021 Standard test corrosion resistance of salt spray test for artificial atmosphere corrosion test, the sample is subjected to neutral salt spray test for 600h, and white corrosive substances are not generated on the surface of the sample. The comparative test shows that the zinc-nickel alloy coating is sealed by the hydroxyl graphene modified coating sealant, so that the corrosion resistance of the coating is obviously improved.
The foregoing has outlined the detailed description of the embodiments of the present utility model, and the detailed description of the embodiments and the embodiments of the present utility model has been provided herein by way of illustration of specific examples, which are intended to be merely illustrative of the principles of the embodiments of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.
Claims (5)
1. The utility model provides a plating layer structure of aerospace aluminum alloy accessory zinc-plated nickel alloy which characterized in that: comprises an aluminum alloy matrix, and a chemical zinc deposition layer, a chemical nickel plating layer, a zinc-nickel alloy plating layer, a hexavalent chromium black passivation layer and a graphene sealing layer which are sequentially prepared on the aluminum alloy matrix from inside to outside;
the graphene sealing layer is prepared by adopting a hydroxyl graphene modified coating sealing agent;
the thickness of the graphene sealing layer is 0.8-2.2 mu m.
2. The plating structure of the zinc-nickel alloy plating for aerospace aluminum alloy accessories of claim 1, wherein: the thickness of the chemical nickel plating layer is 0.3-1 mu m.
3. The plating structure of the zinc-nickel alloy plating for aerospace aluminum alloy accessories of claim 1, wherein: the thickness of the electroless nickel plating layer is 3-10 mu m.
4. The plating structure of the zinc-nickel alloy plating for aerospace aluminum alloy accessories of claim 1, wherein: the thickness of the zinc-nickel alloy plating layer is 8-20 mu m.
5. The plating structure of the zinc-nickel alloy plating for aerospace aluminum alloy accessories of claim 1, wherein: the thickness of the hexavalent chromium black passivation layer is 0.3-0.5 mu m.
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