CN217361286U - Coating structure of sintered neodymium iron boron zinc-nickel alloy - Google Patents
Coating structure of sintered neodymium iron boron zinc-nickel alloy Download PDFInfo
- Publication number
- CN217361286U CN217361286U CN202220786858.5U CN202220786858U CN217361286U CN 217361286 U CN217361286 U CN 217361286U CN 202220786858 U CN202220786858 U CN 202220786858U CN 217361286 U CN217361286 U CN 217361286U
- Authority
- CN
- China
- Prior art keywords
- zinc
- nickel
- iron boron
- neodymium iron
- nickel alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Electroplating And Plating Baths Therefor (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The utility model discloses a cladding material structure of sintered neodymium iron boron zinc-plated nickel alloy, including sintered neodymium iron boron base member and the citrate that prepares in proper order from inside to outside on the neodymium iron boron base member nickel coating in advance, pyrophosphate copper plate, zinc-nickel alloy cladding material and trivalent chromium blue passivation layer. The utility model discloses a cladding material structure of sintered neodymium iron boron zinc-plated nickel alloy carries out neutral salt fog test 480h according to GB/T10125 + 2012 "artificial atmosphere corrosion test salt fog test", and it does not have white corrosive substance to plate a surface and generates. The coating structure has good corrosion resistance.
Description
Technical Field
The utility model belongs to the technical field of metal surface treatment, concretely relates to cladding material structure of sintered neodymium iron boron zinc-plated nickel alloy.
Background
Sintered neodymium iron boron materials have been widely used for preparing high strength permanent magnets. The surface of the sintered neodymium iron boron substrate is porous, and the material has high chemical activity. In the prior art, plating structures such as a zinc plating layer, a nickel-copper-nickel combined plating layer and the like are prepared on the surface of sintered neodymium iron boron, but the plating layers cannot effectively protect the sintered neodymium iron boron substrate from being corroded. At present, after sintered neodymium iron boron magnets sold in the market are placed indoors for two years, the phenomena of pitting corrosion, bubbles and even plating layer shedding appear on the surfaces of some products.
Disclosure of Invention
In order to solve the relatively poor problem of sintered neodymium iron boron plating piece corrosion resistance, the utility model provides a sintered neodymium iron boron zinc-nickel alloy's cladding material structure. In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a sintered neodymium iron boron zinc-nickel alloy's cladding material structure, includes the neodymium iron boron base member and the citrate that prepares in proper order from inside to outside on the neodymium iron boron base member is nickel layer, pyrophosphate copper facing, zinc-nickel alloy cladding material and trivalent chromium blue passivation layer in advance.
Preferably, the thickness of the citrate pre-plated nickel layer is 1-8 μm.
Preferably, the pyrophosphate copper plating layer has a thickness of 5 to 10 μm.
Preferably, the thickness of the zinc-nickel alloy coating is 3-12 μm.
The surface of the sintered neodymium iron boron substrate has more pores, the substrate is directly plated with zinc-nickel alloy, and the plating solution can be immersed in the pores on the surface of the substrate. When the acid zinc-nickel alloy electroplating process is adopted for plating, the acid plating solution can slowly corrode the matrix and the zinc-nickel alloy plating layer, and finally bubbles or pitting corrosion occurs at the pore. When the alkaline zinc-nickel alloy electroplating process is adopted for plating, the alkaline plating solution can corrode the zinc-nickel alloy plating layer, so that pitting corrosion occurs at the pore. The utility model discloses a citrate nickel plating technology preparation nickel coating in advance, neutral citrate nickel plating solution is very weak to neodymium iron boron base member and zinc-nickel alloy cladding material corrosive action, does not have the destructive action to base member and cladding material. The citrate nickel plating solution has higher deep plating capability, and the adoption of the citrate nickel plating process for nickel pre-plating is also beneficial to hole sealing of the surface of the neodymium-iron-boron matrix. After pyrophosphate copper plating is carried out on the pre-plated nickel layer, the pores on the surface of the neodymium-iron-boron matrix can be finally closed, and zinc-nickel alloy is plated on the pyrophosphate copper plating layer, so that high binding force can be formed among all plating layers. Compared with a pyrophosphate copper plating layer, the zinc-nickel alloy plating layer is an anodic plating layer, a higher potential difference exists between the two plating layers, and the pyrophosphate copper plating layer can effectively prevent corrosion media from corroding towards the direction of a substrate.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a coating structure of sintered neodymium iron boron zinc-plated nickel alloy, which can effectively overcome the technical defects that the coating prepared on the surface of the sintered neodymium iron boron matrix in the prior art is easy to blister and form point corrosion;
2. the zinc-nickel alloy coating prepared on the surface of the sintered neodymium-iron-boron matrix of the utility model has the corrosion resistance far higher than that of the coating prepared by the existing electroplating process.
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 plating layer in examples 1 and 2 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.
The utility model provides a sintered neodymium iron boron zinc-nickel alloy's cladding material structure, includes sintered neodymium iron boron base member and the citrate nickel pre-plating layer, pyrophosphate copper-plated layer, zinc-nickel alloy cladding material and the blue passivation layer of trivalent chromium that prepare in proper order from inside to outside on the neodymium iron boron base member.
Carrying out oil removal, rust removal and activation treatment on a neodymium iron boron workpiece substrate according to the existing pretreatment process, and then sequentially preparing a citrate pre-nickel-plated layer, a pyrophosphate copper-plated layer, a zinc-nickel alloy plating layer and a trivalent chromium blue passivation layer.
The thickness of the citrate pre-plated nickel layer is 1-8 mu m, and the citrate pre-plated nickel layer is prepared by adopting the existing citrate nickel plating process.
Preferably, the citrate nickel plating process comprises the following steps: 180-250 g/L of nickel sulfate hexahydrate, 10-12 g/L of sodium chloride, 30-35 g/L of boric acid, 30-40 g/L of magnesium sulfate, 7.0-7.2 of pH value, 50-60 ℃ of temperature and 1-1.5A/cm of cathode current density 2 The cathode is moved 4-6 m/min.
The pyrophosphate copper plating layer is 5-10 mu m thick and is prepared by adopting the existing pyrophosphate copper plating process.
The thickness of the zinc-nickel alloy coating is 3-12 mu m, and the zinc-nickel alloy coating is prepared by adopting the existing zinc-nickel alloy plating process.
Preferably, the zinc-nickel plating process is prepared by adopting a Detron zin 1215 alkaline zinc-nickel alloy electroplating process of Guangzhou ultra-Pont chemical Co: 5.5-8.5 g/L Zn, 1.0-1.8 g/L Ni (provided by 13-22 mL/L DetroNZIN 1215 Ni replenisher), 120-135 g/L NaOH, 90-110 mL/L DetroNZIN 1215 Base adjuvant, 1.0-5.0 mL/L DetroNZIN 1215 Brightene major polishing agent, 0.1-0.8 mL/L DetroNZIN 1215 Purifier R decontaminant, 21-28 deg.C bath temperature, 1.0-3.0A/dm cathode current density 2 The cathode is moved 4-6 m/min.
Preferably, the zinc-nickel plating process is prepared by adopting a Detronzin 1315 alkaline zinc-nickel alloy electroplating process in ultra-high 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, 0.5-1.5 mL/L DETRONZIN 1315 Brightener zinc-nickel main light-emitting agent, 0.5-1.5 mL/L DETRONZIN 1315 LCD zinc-nickel low-region additive, 23-28 ℃ plating bath temperature, and 0.8-2.5A/dm cathode current density 2 The cathode is moved 3-5 m/min.
The trivalent chromium blue passivation layer is prepared by adopting the existing zinc-nickel alloy coating blue passivator.
Preferably, the trivalent chromium blue passivation layer is prepared by using TRIROS 343 zinc-nickel blue passivator in the ultra-high chemical industry: 135-175 mL/L of TRIROS 343 zinc-nickel blue passivator, 1.8-2.6 of pH value, 30-60 ℃ of operating temperature, 45-75 s of soaking time, and stirring in air.
Preferably, the trivalent chromium blue passivation layer is prepared by using TRIROS 344 zinc-nickel blue passivator in ultra-high chemical industry: 15-75 mL/L of TRIROS 344A zinc-nickel blue passivator, 25-100 mL/L of TRIROS 344B zinc-nickel blue passivator, 4.0-4.8 of pH value, 20-30 ℃ of operating temperature, 45-90 s of soaking time, 15-30 s of stay in air, and stirring in weak air.
Example 1
As shown in fig. 1, a coating structure of sintered neodymium iron boron zinc-nickel alloy comprises a neodymium iron boron base body 1, and a citrate pre-nickel-plating layer 2, a pyrophosphate copper-plating layer 3, a zinc-nickel alloy coating layer 4 and a trivalent chromium blue passivation layer 5 which are sequentially prepared from inside to outside on the neodymium iron boron base body 1.
The thickness of the citrate pre-nickel plating layer 2 is 2 μm, and the citrate pre-nickel plating layer is prepared by adopting the existing citrate nickel plating process: 230g/L of nickel sulfate hexahydrate, 12g/L of sodium chloride, 33g/L of boric acid, 33g/L of magnesium sulfate, pH =7.2, temperature 55 ℃, and cathode current density of 1A/cm 2 The cathode was moved 5 m/min.
The pyrophosphate copper plating layer 3 is 6 microns thick and is prepared by adopting the existing pyrophosphate copper plating process.
The thickness of the zinc-nickel alloy coating 4 is 10 μm, and the zinc-nickel alloy coating is prepared by a Detron zin 1215 alkaline zinc-nickel alloy electroplating process developed by Guangzhou ultra-Pont chemical Co., Ltd: 7g/L zinc, 1.5g/L nickel (provided by DetroNZIN 1215 Ni Nickel replenisher 13-22 mL/L), 130g/L sodium hydroxide, 100mL/L DetroNZIN 1215 Base adjuvant, 0.8mL/L DetroNZIN 1215 Brightene major polishing agent, 0.4mL/L DetroNZIN 1215 Purifier cleaning agent, 25 ℃ bath temperature, 2A/dm cathode current density 2 The cathode was moved 5 m/min.
The trivalent chromium blue passivation layer 5 is prepared by TRIROS 343 zinc-nickel blue passivator in ultra-high chemical engineering: TRIROS 343 zinc-nickel blue passivator 150mL/L, pH =2.2, operating temperature 45 ℃, immersion time 60s, air stirring.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the workpiece substrate 1 is subjected to a pretreatment process of "alkaline chemical degreasing → water washing → sulfuric acid pickling → water washing → alkaline cathodic electrolytic degreasing → water washing → alkaline anodic electrolytic degreasing → water washing → acid salt activation → water washing".
2. Pre-nickel plating: after the pretreatment of the workpiece, a pre-plated nickel layer 2 is prepared according to a citrate nickel plating process.
3. Pyrophosphate copper plating: and (3) pre-plating nickel on the workpiece, and then preparing the pyrophosphate copper plating layer 3 according to a pyrophosphate copper plating process.
4. Zinc-nickel alloy plating: after the pyrophosphate copper plating of the workpiece, a zinc-nickel alloy plating layer 4 is prepared according to an alkaline zinc-nickel alloy electroplating process.
5. Blue passivation of trivalent chromium: after plating the zinc-nickel alloy on the workpiece, preparing a trivalent chromium blue passivation layer 5 by 'taking out a dilute sulfuric acid film with the mass fraction of 4% → washing → trivalent chromium blue passivation → washing → drying'.
Example 2
As shown in fig. 1, a coating structure of sintered neodymium iron boron zinc-nickel alloy comprises a neodymium iron boron base body 1, and a citrate pre-nickel-plating layer 2, a pyrophosphate copper-plating layer 3, a zinc-nickel alloy coating layer 4 and a trivalent chromium blue passivation layer 5 which are sequentially prepared from inside to outside on the neodymium iron boron base body 1.
The thickness of the citrate pre-nickel plating layer 2 is 4 μm, and the citrate pre-nickel plating layer is prepared by adopting the existing citrate nickel plating process: 250g/L of nickel sulfate hexahydrate, 12g/L of sodium chloride, 35g/L of boric acid, 35g/L of magnesium sulfate, pH =7.2, temperature of 53 ℃, and cathode current density of 1A/cm 2 The cathode was moved 5 m/min.
The pyrophosphate copper plating layer 3 is 8 mu m thick and is prepared by adopting the existing pyrophosphate copper plating process.
The thickness of the zinc-nickel alloy coating 4 is 8 μm, and the zinc-nickel alloy coating is prepared by adopting a Detron zin 1315 alkaline zinc-nickel alloy electroplating process of ultra-high chemical industry. The plating solution comprises the following components and operating conditions: 8g/L of zinc, 1.2g/L of nickel, 130g/L of sodium hydroxide, 80mL/L of DETRONZIN 1315 Base auxiliary agent, 18mL/L of DETRONZIN 1315 Ni zinc-nickel additive, 1mL/L of DETRONZIN 1315 Brightener zinc-nickel main light agent, 1mL/L of DETRONZIN 1315 LCD zinc-nickel low-area additive, 25 ℃ of plating bath temperature and 1.8A/dm of cathode current density 2 The cathode is movedMove 4 m/min.
The trivalent chromium blue passivation layer 5 is prepared by TRIROS 344 zinc nickel blue passivator in ultra-bonding chemical industry: 50mL/L of TRIROS 344A zinc-nickel blue passivator and 70mL/L of TRIROS 344B zinc-nickel blue passivator, the pH value is 4.5, the operation temperature is 25 ℃, the dipping time is 65s, the solution stays in the air for 20s, and the solution is stirred in the weak air.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the workpiece base 1 is subjected to a pretreatment of "alkaline chemical degreasing → water washing → sulfuric acid pickling → water washing → alkaline cathodic electrolytic degreasing → water washing → alkaline anodic electrolytic degreasing → water washing → acid salt activation → water washing".
2. Pre-nickel plating: after the pretreatment of the workpiece, a nickel preplating layer 2 is prepared by performing nickel preplating according to citrate.
3. Pyrophosphate copper plating: and (3) pre-plating nickel on the workpiece, and then preparing the pyrophosphate copper plating layer 3 according to a pyrophosphate copper plating process.
4. Zinc-nickel alloy plating: after the pyrophosphate copper plating of the workpiece, a zinc-nickel alloy plating layer 4 is prepared according to an alkaline zinc-nickel alloy electroplating process.
5. Blue passivation of trivalent chromium: after galvanizing, the workpiece is subjected to sulfuric acid film removal with the mass fraction of 4% → water washing → trivalent chromium blue passivation → drying to prepare a trivalent chromium blue passivation layer 5.
The coating structure of the sintered neodymium iron boron zinc nickel plated alloy prepared in the embodiments 1 and 2 is subjected to a neutral salt spray test 480h according to GB/T10125-2012 salt spray test for artificial atmosphere corrosion test, and no white rust is generated on the surface of a plated part. The utility model discloses sintered neodymium iron boron zinc-plating nickel alloy's cladding material structure, the time of carrying out neutral salt fog and not growing white rust is 10 times higher than GB/T34491 and 2017 "sintered neodymium iron boron surface coating" standard regulation's the experimental 48h time that starts the corrosion of zinc-plating layer color passivation neutral salt fog.
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, the specific implementation manner and the application range may be changed. In general, nothing in this specification should be construed as limiting the invention.
Claims (4)
1. The utility model provides a cladding material structure of sintered neodymium iron boron zinc-plated nickel alloy which characterized in that: the neodymium iron boron base body is sequentially provided with a citrate pre-nickel-plating layer, a pyrophosphate copper-plating layer, a zinc-nickel alloy plating layer and a trivalent chromium blue passivation layer from inside to outside.
2. The plating structure of sintered nd-fe-b zinc-nickel plated alloy according to claim 1, characterized in that: the thickness of the citrate pre-plated nickel layer is 1-8 mu m.
3. The plating structure of sintered nd-fe-b zinc-nickel plated alloy according to claim 1, characterized in that: the pyrophosphate copper plating layer is 5-10 μm thick.
4. The plating structure of sintered nd-fe-b zinc-nickel plated alloy according to claim 1, characterized in that: the thickness of the zinc-nickel alloy coating is 3-12 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220786858.5U CN217361286U (en) | 2022-04-07 | 2022-04-07 | Coating structure of sintered neodymium iron boron zinc-nickel alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220786858.5U CN217361286U (en) | 2022-04-07 | 2022-04-07 | Coating structure of sintered neodymium iron boron zinc-nickel alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217361286U true CN217361286U (en) | 2022-09-02 |
Family
ID=83055652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220786858.5U Active CN217361286U (en) | 2022-04-07 | 2022-04-07 | Coating structure of sintered neodymium iron boron zinc-nickel alloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217361286U (en) |
-
2022
- 2022-04-07 CN CN202220786858.5U patent/CN217361286U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102605393B (en) | Ni-W-Fe-Co alloy electroplating liquid and electroplating process thereof | |
| CN105350037A (en) | Alkaline non-cyanide zinc plating nickel alloy plating solution and electroplating process thereof | |
| CN110983392B (en) | Method for electroplating zinc-nickel alloy, magnet, electroplating solution and use of potassium chloride | |
| CN111778532A (en) | Alkaline zinc-nickel electroplating method for lock ring and embedded ring of automobile fuel tank | |
| CN107190288B (en) | Preparation method of HEDP copper-plated pore-free thin layer | |
| CN101550570A (en) | Non-cyanide electro cooper plating bath of EDTA system and use method thereof | |
| CN217361286U (en) | Coating structure of sintered neodymium iron boron zinc-nickel alloy | |
| CN215103561U (en) | High corrosion resistance coating structure of iron casting galvanized iron alloy | |
| CN210420166U (en) | Non-cyanide cadmium titanium alloy and trivalent chromium passivation coating structure of aluminum alloy matrix | |
| CN210420210U (en) | Coating structure sealed by cyanide-free cadmium-titanium alloy and graphene of aerospace fastener | |
| CN205115644U (en) | High corrosion resistance's trivalent chromium chromium -plated layer structure | |
| CN212640613U (en) | Coating structure for plating gold-cobalt alloy on zinc alloy die casting | |
| CN211170931U (en) | Iron casting zinc-plating and hydroxyl graphene closed plating structure | |
| CN217351575U (en) | Coating structure of neodymium iron boron zinc-plating chromium-free passivation | |
| CN218666341U (en) | Coating structure of neodymium iron boron zinc-nickel plating alloy and silane chromium-free passivation | |
| CN218642854U (en) | Neodymium iron boron black zinc plating and graphene enclosed plating structure | |
| CN108179447B (en) | Preparation method of cyanide-free cadmium plating layer structure on aluminum alloy substrate | |
| CN215288973U (en) | High corrosion resistance zinc-cobalt alloy coating structure of aluminum alloy part | |
| CN216074060U (en) | Coating structure for zinc alloy die casting plated with pearl nickel and electrophoretic painting | |
| CN217351579U (en) | Coating structure for gold plating on surface of neodymium iron boron | |
| CN212293785U (en) | Zinc alloy die casting pearl chromium plating layer structure with zinc-plated nickel alloy as bottom layer | |
| CN218666344U (en) | Plating layer structure for electroplating trivalent chromium and rare earth electrolytic protection on surface of neodymium iron boron | |
| CN221094324U (en) | Coating structure for hanging-plating imitation gold | |
| CN218710934U (en) | Coating structure for plating zinc alloy die casting trivalent chromium with pearl chromium | |
| CN212925173U (en) | Plating layer structure of palladium-plated steel of zinc alloy die casting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |