CN218666353U - Protective layer structure of neodymium iron boron application graphite alkene electrophoresis lacquer - Google Patents
Protective layer structure of neodymium iron boron application graphite alkene electrophoresis lacquer Download PDFInfo
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- CN218666353U CN218666353U CN202222706244.4U CN202222706244U CN218666353U CN 218666353 U CN218666353 U CN 218666353U CN 202222706244 U CN202222706244 U CN 202222706244U CN 218666353 U CN218666353 U CN 218666353U
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Abstract
The utility model discloses an inoxidizing coating structure of neodymium iron boron coating graphite alkene electrophoresis lacquer, including the neodymium iron boron base member and the citrate nickel precoating layer and the graphite alkene electrophoresis lacquer coating that prepare in proper order from inside to outside on the neodymium iron boron base member. The utility model discloses the inoxidizing coating structure of preparation carries out neutral salt fog test 480h according to GB/T10125-2021 "artificial atmosphere corrosion test salt fog test" and plates a surface and do not have the corrosion. The protective layer structure is environment-friendly in preparation process and has good corrosion resistance.
Description
Technical Field
The utility model belongs to the technical field of metal surface treatment, concretely relates to inoxidizing coating structure of neodymium iron boron application graphite alkene electrophoresis lacquer.
Background
The Nd-Fe-B permanent magnetic material has excellent magnetic performance and high cost performance, and is always favored by people since the 20 th century and 80 th generation. China has become the production and market center of global Nd-Fe-B permanent magnetic materials, and the materials are widely applied in high and new technical fields of computers, network information, aerospace, communication, traffic, household appliances, health care and the like. Under the background of the era of energy conservation, environmental protection and low-carbon economy, the development of new energy automobiles, wind power generation, energy-saving household appliances, small-sized light-weight automobiles and variable-frequency air conditioners can continuously increase the market demand of the neodymium-iron-boron permanent magnet material, and simultaneously, higher requirements are provided for the corrosion resistance of the neodymium-iron-boron permanent magnet material.
The neodymium iron boron permanent magnet alloy is prepared by adopting a powder metallurgy process, has the defects of sintering air holes and the like, and has a multi-phase structure comprising a main phase Nd2Fe14B, an Nd-rich phase (Nd 4 Fe) and a B-rich phase (Nd 1+ epsilon Fe4B 4), wherein the volume fractions of all the phases are respectively about 84%,14% and 2%. The Nd2Fe14B main phase is a magnetic phase and has strong uniaxial magnetocrystalline anisotropy and high saturation magnetization; the Nd-rich phase is a non-magnetic phase and is distributed in a net shape along the main phase grain boundary or the grain boundary corner, so that the densification of the magnet can be promoted and the coercive force can be improved; the B-rich phase is mainly distributed in the grain boundary of the main phase in a granular manner, and has little influence on the magnetic performance. Because the Nd-rich phase and the B-rich phase are very active and have poor chemical stability, the oxidation is very easy to occur, and the electrochemical potentials of the phases are very different, so that the electrochemical corrosion is easy to occur.
In the prior art, protective layers such as a zinc coating, a nickel coating, a copper-nickel-chromium combined coating, a nickel-copper-nickel combined coating, a nickel-tin combined coating, a nickel-silver combined coating, a nickel-gold combined coating, an electronickelling and chemical nickel combined coating and the like are prepared on the surface of neodymium iron boron. The plating layer structure adopting zinc plating, bright nickel plating and watt nickel plating as the pre-plated nickel layer has the problem of matrix and plating layer corrosion when the plating solution is immersed into the pores on the surface of the plated part due to the acidity or strong basicity of the plating solution, so that the corrosion resistance of the plating layers is low. The standard of GB/T34491-2017 sintered NdFeB surface coating specifies that the time for starting rusting in a neutral salt spray test of a nickel-copper-nickel composite coating according to GB/T10125-2021 salt spray test in artificial atmosphere corrosion test is 48h, and the salt spray resistance test time of the coating prepared by the NdFeB substrate is obviously shorter than that of the coatings prepared by other substrates. Therefore, the development of new technologies to solve these problems in the electroplating of the ndfeb permanent magnet material has become a hot point of research in the industry.
The citrate nickel plating solution is neutral, has weak corrosion effect on the neodymium iron boron substrate, but has slow deposition speed, and is not suitable for preparing thicker nickel plating layers.
An invention patent with an authorization publication number of CN 112877737B, namely a method for coating hydroxyl graphene modified electrophoretic paint on nickel-free stainless steel and a protective coating, discloses hydroxyl graphene modified electrophoretic paint, and the prepared electrophoretic paint coating has excellent corrosion resistance.
Disclosure of Invention
In order to solve the relatively poor problem of neodymium iron boron plating piece corrosion resistance, the utility model provides an inoxidizing coating structure of neodymium iron boron application graphite alkene electrophoresis lacquer. In order to achieve the purpose, the utility model adopts the following technical scheme:
a protective layer structure of neodymium iron boron coated graphene electrophoretic paint comprises a neodymium iron boron base body, and a citrate pre-nickel-plated layer and a graphene electrophoretic paint coating which are sequentially prepared on the neodymium iron boron base body from inside to outside;
the thickness of the citrate pre-plated nickel layer is 2-7 mu m.
Preferably, the thickness of the graphene electrophoretic paint coating is 8-16 μm.
There are more holes on neodymium iron boron base member surface, the utility model discloses a citrate nickel plating technology preparation nickel coating in advance, can not destroy base member and inoxidizing coating after neutral citrate nickel plating solution soaks the hole on neodymium iron boron surface. The citrate nickel plating solution has higher deep plating capability, and the adoption of the citrate nickel plating process for pre-plating nickel is also beneficial to hole sealing of the neodymium iron boron matrix. The nickel plating layer has high corrosion resistance, and the nickel plating layer prepared on the surface of the neodymium iron boron has good protection effect on a matrix. The graphene electrophoretic paint is coated on the pre-nickel-plated layer, and the coating have higher binding force. The graphene electrophoretic paint coating has high corrosion resistance, and can effectively prevent corrosion of corrosive media.
If the electrophoretic paint coating is directly prepared on the surface of the neodymium-iron-boron matrix, corrosive media can quickly corrode the matrix after penetrating through the electrophoretic paint coating, so that the electrophoretic paint coating falls off.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a protective layer structure of neodymium iron boron coated graphene electrophoretic paint, which can effectively overcome the technical defect of low corrosion resistance of a coating prepared on the surface of a neodymium iron boron substrate in the prior art;
2. the utility model discloses preparation technology green accords with the industrial policy requirement of national fourteen five development plans.
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 structural diagram of the protective layer according to embodiments 1, 2 and 3 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 inoxidizing coating structure of neodymium iron boron coating graphite alkene electrophoresis lacquer, includes the neodymium iron boron base member and citrate nickel precoating and graphite alkene electrophoresis lacquer coating that from inside to outside prepared in proper order on the neodymium iron boron base member.
Carrying out oil removal, rust removal and activation treatment on the neodymium iron boron workpiece substrate according to the existing pretreatment process, and then sequentially preparing a citrate pre-plated nickel layer and a graphene electrophoretic paint coating.
The thickness of the citrate pre-plated nickel layer is 2-7 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 plating bath temperature, 1-1.5A/dm < 2 > of cathode current density and 4-6 m/min of cathode movement.
The thickness of the electrophoretic paint coating is 8-16 mu m, and the graphene electrophoretic paint coating is prepared by a graphene electrophoretic paint coating process.
Preferably, the graphene electrophoretic paint coating process is prepared by adopting an AKINI 120 electrophoresis process developed by Guangzhou ultra-high chemical Limited company: 280-350 mL/L of AKINI 120 protective agent, 150-200 g/L of AKINI 120 hydroxyl graphene filler, 8-12 g/L of AKINI PL IT dye, 25-30 ℃ of operation temperature, 30-60V of tank voltage, 40-90 s of electrophoresis time, 130-150 ℃ of curing temperature and 40-70 min of curing time.
Example 1:
as shown in fig. 1, a protective layer structure of neodymium iron boron coating graphite alkene electrophoresis lacquer, including neodymium iron boron base member 1 the citrate that prepares in proper order on the neodymium iron boron base member 1 from inside to outside nickel coating 2 and black graphite alkene electrophoresis lacquer coating 3 in advance.
The thickness of the citrate pre-nickel plating layer 2 is 3 μm, and the citrate pre-nickel plating layer is prepared by adopting the existing citrate nickel plating process: 220g/L of nickel sulfate hexahydrate, 10g/L of sodium chloride, 30g/L of boric acid, 40g/L of magnesium sulfate, pH =7.2, the temperature of a plating bath is 53 ℃, the current density of a cathode is 1.3A/dm < 2 >, and the cathode moves for 5m/min.
The thickness of the black graphene electrophoretic paint coating is 10 μm. The preparation method adopts an AKINI 120 electrophoresis process of ultra-high chemical engineering: 340mL/L of AKINI 120 protective agent, 200g/L of AKINI 120 hydroxy graphene filler, 10g/L of AKINI PL IT black dye, 30 ℃ of operation temperature, 45V of bath voltage, 50s of electrophoresis time, 140 ℃ of curing temperature and 60min of curing time.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the workpiece base 1 is subjected to a pretreatment process of "alkaline chemical degreasing → water washing → rust removal → water washing → ultrasonic 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. Coating electrophoretic paint: after the workpiece is preplated with nickel, "coating graphene electrophoretic paint → washing → heating and curing" to prepare the black graphene electrophoretic paint coating 3.
Example 2:
as shown in fig. 1, a protective layer structure of neodymium iron boron coating graphene electrophoretic paint comprises a neodymium iron boron base body 1, a citrate pre-plated nickel layer 2 and a blue graphene electrophoretic paint coating 3 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 5 μm.
The nickel plating solution is prepared by adopting the existing citrate nickel plating process: 240g/L of nickel sulfate hexahydrate, 12g/L of sodium chloride, 33g/L of boric acid, 35g/L of magnesium sulfate, pH =7.2, plating bath temperature of 55 ℃, cathode current density of 1.3A/dm < 2 >, and cathode movement of 5m/min.
The thickness of the black graphene electrophoretic paint coating is 8 μm.
The preparation method adopts an ultra-bonding AKINI 120 electrophoresis process: 300mL/L of AKINI 120 protective agent, 160g/L of AKINI 120 hydroxy graphene filler, 10g/L of AKINI PL IT blue dye, 25 ℃ of operation temperature, 45V of bath voltage, 50s of electrophoresis time, 140 ℃ of curing temperature and 60min of curing time.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the workpiece base 1 is subjected to a pretreatment process of "alkaline chemical degreasing → water washing → rust removal → water washing → ultrasonic 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. Coating electrophoretic paint: after the workpiece is preplated with nickel, "coating graphene electrophoretic paint → washing → heating and curing" to prepare a blue graphene electrophoretic paint coating 3.
Example 3:
as shown in fig. 1, a protection layer structure of neodymium iron boron coating graphite alkene electrophoresis lacquer, including neodymium iron boron base member 1 the citrate that prepares in proper order on the neodymium iron boron base member 1 from inside to outside nickel coating 2 and green graphite alkene electrophoresis lacquer coating 3 in advance.
The thickness of the citrate pre-nickel plating layer 2 is 4 μm.
The nickel plating solution is prepared by adopting the existing citrate nickel plating process: 200g/L of nickel sulfate hexahydrate, 10g/L of sodium chloride, 30g/L of boric acid, 32g/L of magnesium sulfate, pH =7.2, plating bath temperature of 50 ℃, cathode current density of 1A/dm < 2 >, and cathode movement of 5m/min.
The thickness of the green graphene electrophoretic paint coating is 12 μm.
The preparation method adopts an ultra-bonding AKINI 120 electrophoresis process: 320mL/L of AKINI 120 protective agent, 340g/L of AKINI 120 hydroxy graphene filler, 10g/L of AKINI PL IT green dye, 28 ℃ of operation temperature, 45V of bath voltage, 50s of electrophoresis time, 140 ℃ of curing temperature and 60min of curing time.
The operation of this embodiment is divided into the following steps:
1. pretreatment: the workpiece base 1 is subjected to a pretreatment process of "alkaline chemical degreasing → water washing → rust removal → water washing → ultrasonic degreasing → water washing → acid salt activation → water washing".
2. Pre-plating nickel: after the pretreatment of the workpiece, a pre-plated nickel layer 2 is prepared according to a citrate nickel plating process.
3. Coating electrophoretic paint: after the workpiece is preplated with nickel, "coating graphene electrophoretic paint → washing → heating and curing" to prepare the green graphene electrophoretic paint coating 3.
Test example 1
The protective layer structure of the ndfeb coated graphene electrophoretic paint prepared in the embodiments 1, 2 and 3 is subjected to a neutral salt spray test 480h according to the standard of GB/T10125-2021 salt spray test for Artificial atmosphere Corrosion test, and the surface of a plated part is not rusted. The utility model discloses the inoxidizing coating structure of neodymium iron boron base member of preparation carries out neutral salt fog time that does not corrode and is 10 times of the experimental 48h of the neutral salt fog of nickel copper nickel combined coating of GB/T34491-2017 "sintered neodymium iron boron surface coating" standard regulation and begins the corrosion time.
Test example 2
In this test example, the sample prepared in examples 1, 2 and 3 was subjected to a plating adhesion test, and the plating adhesion was tested by a thermal shock method according to GB/T5270-2005, review of test methods for the adhesion strength of metal coatings and electroless plating layers on metal substrates, and the plated article was heated in a heating furnace to 300 ℃ and held for 30min, and was taken out and then placed in water at room temperature to be cooled down rapidly, and the plating layer did not blister or fall off. Tests show that the coating structure prepared by the invention has good binding force.
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 are variations in the specific implementation and application ranges. In general, nothing in this specification should be construed as limiting the invention.
Claims (2)
1. The utility model provides a protective layer structure of neodymium iron boron application graphite alkene electrophoresis lacquer which characterized in that: the preparation method comprises the following steps of preparing a neodymium iron boron substrate, and a citrate pre-plated nickel layer and a graphene electrophoretic paint coating which are sequentially prepared on the neodymium iron boron substrate from inside to outside;
the thickness of the citrate pre-plated nickel layer is 2-7 mu m.
2. The protective layer structure of an ndfeb coated graphene electrophoretic paint according to claim 1, wherein: the thickness of the graphene electrophoretic paint coating is 8-16 mu m.
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| US20230035512A1 (en) * | 2021-07-30 | 2023-02-02 | Dell Products L.P. | Information handling system thermal and emi enclosures |
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| US20230035512A1 (en) * | 2021-07-30 | 2023-02-02 | Dell Products L.P. | Information handling system thermal and emi enclosures |
| US11822395B2 (en) * | 2021-07-30 | 2023-11-21 | Dell Products L.P. | Information handling system thermal and EMI enclosures |
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