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 PDF

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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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cyanide
titanium alloy
graphene
free
layer
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郭崇武
赖奂汶
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Guangzhou Ultra Union Chemicals Ltd
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Guangzhou Ultra Union Chemicals Ltd
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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

Coating structure sealed by cyanide-free cadmium-titanium alloy and graphene of aerospace fastener
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.
CN201920691792.XU 2019-05-14 2019-05-14 Coating structure sealed by cyanide-free cadmium-titanium alloy and graphene of aerospace fastener Active CN210420210U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112941512A (en) * 2021-01-29 2021-06-11 广州超邦化工有限公司 Electro-zinc-cadmium alloy and method for coating hydroxyl graphene modified electrophoretic paint

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112941512A (en) * 2021-01-29 2021-06-11 广州超邦化工有限公司 Electro-zinc-cadmium alloy and method for coating hydroxyl graphene modified electrophoretic paint

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