CN110983416A - Electrophoretic paint painting process - Google Patents
Electrophoretic paint painting process Download PDFInfo
- Publication number
- CN110983416A CN110983416A CN201911421311.4A CN201911421311A CN110983416A CN 110983416 A CN110983416 A CN 110983416A CN 201911421311 A CN201911421311 A CN 201911421311A CN 110983416 A CN110983416 A CN 110983416A
- Authority
- CN
- China
- Prior art keywords
- workpiece
- electrophoretic
- paint
- rust
- electrophoretic paint
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/04—Electrophoretic coating characterised by the process with organic material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
- C23C22/36—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates
- C23C22/362—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates containing also zinc cations
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/065—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors sulfur-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/20—Pretreatment
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses an electrophoretic paint painting process, which comprises the following steps: firstly, sequentially polishing, hole sealing, homogenizing and deoiling a workpiece to be painted; step two, putting the workpiece treated in the step one into a rust remover for removing rust; step three, carrying out phosphating treatment on the workpiece treated in the step two, and step four, carrying out electrophoretic painting on the workpiece treated in the step three, wherein the electrophoretic painting adopts epoxy resin electrophoretic painting, the solid content of the electrophoretic painting is 18 wt%, the pH value is 6, the conductivity is 800-plus-one-1200 mu S/cm, and the electrophoretic painting parameters are as follows: the electrophoresis voltage is 150-250V, the temperature of the electrophoretic paint liquid is 26-30 ℃, the electrophoresis time is 2-3min, and the curing condition is 180-30 min. The invention has the beneficial effects that: the paint surface prepared by the electrophoretic paint painting process can be well applied to permanent magnets, is uniform and smooth and has excellent corrosion resistance.
Description
Technical Field
The invention relates to the field of corrosion protection, in particular to an electrophoretic paint painting process.
Background
Electrophoresis is one of the most effective methods for coating metal workpieces. The electrophoretic coating is a special coating method which comprises the steps of immersing an object to be coated with electric conductivity into an electrophoretic coating tank which is filled with water and diluted and has relatively low concentration to be used as an anode (or a cathode), arranging a cathode (or an anode) corresponding to the object in the tank, and depositing a uniform, fine and water-insoluble coating film on the surface of the object to be coated after direct current is conducted between the two electrodes for a period of time. The electrophoretic coating and the coating method are industrially applied after the 60 s in the 20 th century, a fully-closed circulating system can be operated by adopting the electrophoretic coating, and the utilization rate of the coating can reach about 95 percent. The electrophoretic coating uses water-soluble or water-dispersible ionic polymer as a film forming material, and the coated workpiece can be an anode or a cathode. The electrophoretic paint can be divided into anode electrophoretic paint and cathode electrophoretic paint according to the electrode of the workpiece to be coated; the anionic electrophoretic coating and the cationic electrophoretic coating can be classified according to the ionic form of the film-forming material in water. The cathode electrophoretic paint can be divided into a single-component electrophoretic paint and a two-component electrophoretic paint according to the water dispersion state; it can be divided into film type, medium thick film and thick film type cathode electrophoretic paint according to the thickness of the film. The cathodic electrophoretic paint can be divided into: epoxy electrophoretic paint, acrylic electrophoretic paint, and polyurethane electrophoretic paint. Epoxy electrophoretic paint: the salt spray performance on a phosphorized substrate can reach more than 1000 hours, and the main mature products are mainly bright black, dumb black, dark gray and light gray. The epoxy electrophoretic paint is a paint capable of covering a substrate, is mainly used for primer corrosion prevention, and can also be used as a finish paint for hardware workpieces with general requirements.
A permanent magnet is a magnet that retains a high remanence for a long period of time in an open circuit state. Such as natural magnetite (magnetite), artificial magnet (alnico), and the like. Besides permanent magnets, there are electromagnets that are magnetic only when energized. The permanent magnet is also called a hard magnet, so that the permanent magnet is not easy to lose magnetism and is not easy to be magnetized. However, if the permanent magnet is heated above the curie temperature or is located in an environment of high magnetic field strength in the opposite direction, the magnetic properties thereof are also reduced or lost. Some magnets are brittle and may crack at high temperatures. The maximum service temperature of alnico magnets exceeds 540 ℃ (1000F), samarium-cobalt magnets and ferrites are about 300 ℃ (570F), and neodymium magnets and soft magnets are about 140 ℃ (280F). The NdFeB permanent magnet is widely used in various magnetic circuits requiring high magnetic properties and miniaturization of volume because of its excellent magnetic properties. However, the problem of corrosion resistance of the NdFeB magnet is solved as one of the key problems of the application of the NdFeB magnet, because the Nd-rich phase in the NdFeB magnet is very easy to oxidize in air, particularly in humid air, which causes magnet pulverization to cause magnetic performance reduction and affects normal operation of devices. Surface coating methods are currently used to improve corrosion resistance, and the types of coatings include metal coatings, inorganic salt coatings, and organic coatings. Epoxy resin coating processes are various, including brushing, spraying, electrostatic powder coating, electrophoresis and the like, wherein brushing and air spraying must use an organic solvent as a diluent in order to ensure uniform distribution of the coating, so that on one hand, environmental pollution is caused, on the other hand, the uniformity of the coating is difficult to ensure, and local accumulation is caused inevitably at corner parts, thereby influencing the dimensional tolerance of a magnet. The electrostatic powder coating process is to deposit large particle powder of resin on the surface of a workpiece, and in order to eliminate pores in the coating and meet the requirement of corrosion resistance, the coating is required to be ensured to be more than 50 microns, so that the application of the electrostatic powder coating to an NdFeB magnet can cause the shielding of magnetic performance. Therefore, it is necessary to design an electrophoretic paint painting process suitable for the surface of the NdFeB permanent magnet.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a electrophoretic paint painting process.
The invention is realized by the following scheme:
an electrophoretic paint painting process, comprising the steps of:
firstly, sequentially polishing, hole sealing, homogenizing and deoiling a workpiece to be painted;
step two, putting the workpiece treated in the step one into a rust remover for removing rust;
thirdly, carrying out phosphating treatment on the workpiece treated in the second step, wherein the total free acid of phosphating solution for phosphating treatment is 3-4, the total acid is 120-125, the time of phosphating treatment is 20 minutes, the temperature is 30 ℃, and ultrasonic assistance is carried out in the whole process of phosphating treatment;
step four, performing electrophoretic painting on the workpiece treated in the step three, wherein the electrophoretic paint is epoxy resin electrophoretic paint, the solid content of the electrophoretic paint is 18 wt%, the pH value is 6, the conductivity is 800-: the electrophoresis voltage is 150-250V, the temperature of the electrophoretic paint liquid is 26-30 ℃, the electrophoresis time is 2-3min, and the curing condition is 180-30 min.
In step one;
polishing the workpiece to be painted by using abrasive paper with different meshes until the surface is bright and smooth;
the hole sealing is to immerse the polished workpiece into zinc stearate in a molten state at the temperature of 140 ℃ for 30 minutes;
the homogenization is to prepare a solution by using 5g/L oxalic acid, and then soak the workpiece test piece for 1 minute;
the oil removal is realized by baking, and the workpiece is baked for 1 hour in an oven at the temperature of 240 ℃.
In the second step, the rust remover comprises 40mL/L nitric acid and 0.5g/L thiourea, the pH value of the rust remover is adjusted to 4 by ammonia water, and the workpiece to be rust-removed is placed in the rust remover until rust on the surface of the workpiece is completely removed.
In the third step, the ultrasonic frequency assisted by the ultrasonic wave is 30-35 kHz, and the ultrasonic sound energy density is 0.1-0.2W/cm2。
In the third step, the phosphating solution comprises 2g/L of phosphoric acid, 60g/L of zinc dihydrogen phosphate, 80g/L of zinc nitrate, 1g/L of sodium nitrite, 4g/L of nickel nitrate, 2g/L of sodium fluoride and 1g/L of tartaric acid.
The invention has the beneficial effects that: the paint surface prepared by the electrophoretic paint painting process can be well applied to permanent magnets, is uniform and smooth and has excellent corrosion resistance.
Detailed Description
The invention is further illustrated by the following specific examples:
an electrophoretic paint painting process, comprising the steps of:
firstly, sequentially polishing, hole sealing, homogenizing and deoiling a workpiece to be painted; polishing the workpiece to be painted by using abrasive paper with different meshes until the surface is bright and smooth; the hole sealing is to immerse the polished workpiece into zinc stearate in a molten state at the temperature of 140 ℃ for 30 minutes; the homogenization is to prepare a solution by using 5g/L oxalic acid, and then soak the workpiece test piece for 1 minute; the oil removal is realized by baking, and the workpiece is baked for 1 hour in an oven at the temperature of 240 ℃.
The hole sealing can form heat-resistant and chemical-corrosion-resistant polymer or inorganic material in the pores, effectively fill the gaps, and reduce the porosity of the magnet, so that pretreatment liquid is prevented from entering the pores of the base material, and the candle resistance is improved. The homogenization can adjust the chemical activity of the surface of the permanent magnet, and provides a platform for the epitaxial growth of a subsequent phosphate layer. The oil removal causes the grease in the magnet material to be carbonized into ash, so that the grease in the pores of the magnet material is removed, and the influence on the coating during electrophoresis is reduced.
Step two, putting the workpiece treated in the step one into a rust remover for removing rust; in the second step, the rust remover comprises 40mL/L nitric acid and 0.5g/L thiourea, the pH value of the rust remover is adjusted to 4 by ammonia water, and the workpiece to be rust-removed is placed in the rust remover until rust on the surface of the workpiece is completely removed.
The rust remover selects nitric acid as a main rust removing component, can uniformly corrode the surface of a workpiece, has no selective corrosion, selects ammonia water for carrying out pH value, and performs complex reaction with neodymium to prevent oxidation and hydrogenation of neodymium to a certain extent, and thiourea is mainly used as a corrosion inhibitor to avoid excessive corrosion in the rust removing process.
Thirdly, carrying out phosphating treatment on the workpiece treated in the second step, wherein the total free acid of phosphating solution for phosphating treatment is 3-4, the total acid is 120-125, the time of phosphating treatment is 20 minutes, the temperature is 30 ℃, and ultrasonic assistance is carried out in the whole process of phosphating treatment; the ultrasonic frequency assisted by the ultrasonic wave is 30-35 kHz, and the ultrasonic sound energy density is 0.1-0.2W/cm2. The phosphating solution comprises 2g/L of phosphoric acid, 60g/L of zinc dihydrogen phosphate, 80g/L of zinc nitrate, 1g/L of sodium nitrite, 4g/L of nickel nitrate, 2g/L of sodium fluoride and 1g/L of tartaric acid.
The ultrasonic-assisted phosphating can effectively improve the corrosion resistance of a matrix, and because the ultrasonic waves have a stirring effect, hydrogen is generated along with the continuous progress of the phosphating reaction, if hydrogen bubbles formed on the surface of metal cannot be desorbed in time, the phosphating speed can be reduced, and the film performance and the appearance can be influenced. The application of ultrasonic wave is favorable for accelerating the desorption speed of bubbles and increasing the number of unit cell active centers formed on the surface of the metal. The film weight, the film thickness, the corrosion resistance and the like of the phosphating film prepared by the sample application are greatly improved compared with the conventional phosphating, the film structure is more compact and uniform, and the subsequent electrophoretic painting is facilitated.
Generally, the higher the acid ratio, the finer and thinner the phosphating film, but the too high acid ratio makes the film formation difficult, the too large amount of phosphating sludge, and the too small acid ratio makes the phosphating film coarse and loose in crystals. The phosphating tank solution with smaller acid ratio has high free acidity, slow phosphating speed and high phosphating temperature requirement. The acid ratio of the phosphating solution is controlled to be 35-45, and the phosphating film has better candle resistance.
Step four, performing electrophoretic painting on the workpiece treated in the step three, wherein the electrophoretic painting has the solid content of 18 wt%, the pH value of 6 and the conductivity of 800-: the electrophoresis voltage is 150-250V, the temperature of the electrophoretic paint liquid is 26-30 ℃, the electrophoresis time is 2-3min, and the curing condition is 180-30 min.
In this embodiment, the painted finish is also baked, using a step bake: baking at 80 deg.C for 30min, and baking at 180 deg.C for 30 min. On one hand, the step baking is beneficial to the uniform release of the moisture of the paint film, and the generation of bubbles in the paint film is prevented; on the other hand, the paint film is not cured at low temperature, has higher fluidity, can improve the defects of the clamp on the paint film and the pinhole defect of the paint film during electrodeposition, and can improve the corner effect of the paint film.
The electrophoretic paint adopts the purchased epoxy resin electrophoretic paint, the cathode epoxy resin electrophoretic paint generally has alkaline genes, the alkaline genes are ionized in water after being neutralized by organic acid, the positive charges of the dissociated resin cations (resin and wrapped pigment particles) are charged with positive charges, four electrochemical processes of electrolytic electrophoretic electrodeposition and electroosmosis are generated under the action of externally applied direct current, the four electrochemical reaction processes are simultaneously carried out and mutually restricted, when the paint film reaches a certain thickness, the reaction process is stopped because the resistance of the paint film reaches a certain value, the paint film is in a lusterless uniform sponge shape and is dehydrated, and even if the paint film is sprayed by water, the paint film can not fall off and is baked and cured to obtain a smooth paint film.
The solid content of the electrophoretic paint is 18 wt%, the shape of the permanent magnet workpiece is relatively simple, a good paint film can be obtained when the solid content is lower than the lower limit, so that the loss of the paint liquid brought out can be ensured to be low, and if the solid content is too low, the consistency of the appearance of the paint film is influenced due to the thin paint film, and the probability of forming pinhole defects is greatly increased.
The pH value of the paint liquid is 6, the pH value of the paint liquid has great influence on a paint film, and the pH value is an important parameter for ensuring the water solubility of the electrophoretic paint resin, if the pH value is too high, the electrophoretic paint liquid becomes emulsion, even the precipitation of the resin occurs, the throwing power is reduced, the paint film is loosened, the pinhole defect is generated, and the appearance and the corrosion resistance are influenced. If the pH value is too low, the electrodeposition performance is deteriorated, so that the paint film is rough, even the paint film is re-dissolved, and a plurality of defects on the appearance of the paint film are caused, so that the organic acid with small ionization degree can be used as a neutralizing agent to buffer hydrogen ions generated by an anode during electrophoresis.
The electrophoresis voltage is 150-250V, the optimal working voltage is also related to the solid content, the temperature, the conductivity and the inter-polar distance of the paint liquid, and the paint film is thickened along with the increase of the voltage in the application.
The temperature of the electrophoretic paint liquid is 26-30 ℃, the temperature is increased, the viscosity of the paint liquid is reduced, the movement of the electrophoretic paint resin ions is accelerated, the deposition speed is accelerated, and the thickening of the coating film is facilitated. However, too high temperature may also cause the defects of pinholes, orange peel and the like of the paint film due to too fast transmission of hydrogen ions and impurity ions and aggravation of hydrolysis reaction. The electrophoresis process is generally accompanied by an exotherm, and the temperature of the paint liquid increases continuously, so that cooling is necessary.
The workpiece paint prepared by the method is detected, the appearance is smooth and flat, no pinhole defect exists, the thickness of the paint film is 20-25 micrometers, the hardness is 5H detected by a pencil hardness method, the adhesive force is good, and the paint film is well adhered by violent impact in the magnetizing process. The damp-heat resistance test of 172h is carried out under the conditions that the temperature is 85 ℃ and the relative humidity is 85 percent, and the surface paint film of the permanent magnet is intact.
Although the invention has been described and illustrated in some detail, it should be understood that various modifications may be made to the described embodiments or equivalents may be substituted, as will be apparent to those skilled in the art, without departing from the spirit of the invention.
Claims (5)
1. An electrophoretic paint painting process, which is characterized by comprising the following steps:
firstly, sequentially polishing, hole sealing, homogenizing and deoiling a workpiece to be painted;
step two, putting the workpiece treated in the step one into a rust remover for removing rust;
thirdly, carrying out phosphating treatment on the workpiece treated in the second step, wherein the total free acid of phosphating solution for phosphating treatment is 3-4, the total acid is 120-125, the time of phosphating treatment is 20 minutes, the temperature is 30 ℃, and ultrasonic assistance is carried out in the whole process of phosphating treatment;
step four, performing electrophoretic painting on the workpiece treated in the step three, wherein the electrophoretic paint is epoxy resin electrophoretic paint, the solid content of the electrophoretic paint is 18 wt%, the pH value is 6, the conductivity is 800-: the electrophoresis voltage is 150-250V, the temperature of the electrophoretic paint liquid is 26-30 ℃, the electrophoresis time is 2-3min, and the curing condition is 180-30 min.
2. The electrodeposition paint painting process according to claim 1, wherein: in step one;
polishing the workpiece to be painted by using abrasive paper with different meshes until the surface is bright and smooth;
the hole sealing is to immerse the polished workpiece into zinc stearate in a molten state at the temperature of 140 ℃ for 30 minutes;
the homogenization is to prepare a solution by using 5g/L oxalic acid, and then soak the workpiece test piece for 1 minute;
the oil removal is realized by baking, and the workpiece is baked for 1 hour in an oven at the temperature of 240 ℃.
3. The electrodeposition paint painting process according to claim 1, wherein: in the second step, the rust remover comprises 40mL/L nitric acid and 0.5g/L thiourea, the pH value of the rust remover is adjusted to 4 by ammonia water, and the workpiece to be rust-removed is placed in the rust remover until rust on the surface of the workpiece is completely removed.
4. The electrodeposition paint painting process according to claim 1, wherein: in the third step, the ultrasonic frequency assisted by the ultrasonic wave is 30-35 kHz, and the ultrasonic sound energy density is 0.1-0.2W/cm2。
5. The electrodeposition paint painting process according to claim 1, wherein: in the third step, the phosphating solution comprises 2g/L of phosphoric acid, 60g/L of zinc dihydrogen phosphate, 80g/L of zinc nitrate, 1g/L of sodium nitrite, 4g/L of nickel nitrate, 2g/L of sodium fluoride and 1g/L of tartaric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911421311.4A CN110983416A (en) | 2019-12-31 | 2019-12-31 | Electrophoretic paint painting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911421311.4A CN110983416A (en) | 2019-12-31 | 2019-12-31 | Electrophoretic paint painting process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110983416A true CN110983416A (en) | 2020-04-10 |
Family
ID=70080277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911421311.4A Pending CN110983416A (en) | 2019-12-31 | 2019-12-31 | Electrophoretic paint painting process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110983416A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112663116A (en) * | 2020-12-28 | 2021-04-16 | 宁波韵升股份有限公司 | Electrophoresis black epoxy process for improving corrosion resistance and binding force of neodymium iron boron magnet |
| CN112813437A (en) * | 2021-01-06 | 2021-05-18 | 浙江俊荣五金工业有限公司 | Screw surface treatment process |
| CN114134554A (en) * | 2021-10-27 | 2022-03-04 | 山东鲁玉减震系统技术有限公司 | Electrophoretic coating production method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101015858A (en) * | 2006-12-28 | 2007-08-15 | 武汉材料保护研究所 | Nd-Fe-B magnet inorganic sealing hole adhesion and cathode electrophoresis composite surface protection technique |
| CN101022051A (en) * | 2006-10-28 | 2007-08-22 | 山西师鸣精细化工有限公司 | Method for bonderizing sintered neodymium ferroboron magnetic material |
| CN102828208A (en) * | 2012-09-10 | 2012-12-19 | 太原理工大学 | Method for electroplating zinc in neodymium iron boron magnet ionic liquid |
| CN102994999A (en) * | 2012-10-30 | 2013-03-27 | 宁波永久磁业有限公司 | Phosphating treatment method for surface of sintered neodymium-iron-boron material |
| CN105648503A (en) * | 2016-03-28 | 2016-06-08 | 钢铁研究总院 | Method for preparing high-weather-resistance high-corrosion-resistance high-abrasion-resistance organic coating for surface of magnet |
| CN107604405A (en) * | 2017-10-23 | 2018-01-19 | 安徽中磁高科有限公司 | Magneto neodymium iron boron magnetic materials electro-plating method |
| CN108048829A (en) * | 2017-12-11 | 2018-05-18 | 宁波韵升股份有限公司 | A kind of electrophoresis method of neodymium iron boron magnetic body |
-
2019
- 2019-12-31 CN CN201911421311.4A patent/CN110983416A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101022051A (en) * | 2006-10-28 | 2007-08-22 | 山西师鸣精细化工有限公司 | Method for bonderizing sintered neodymium ferroboron magnetic material |
| CN101015858A (en) * | 2006-12-28 | 2007-08-15 | 武汉材料保护研究所 | Nd-Fe-B magnet inorganic sealing hole adhesion and cathode electrophoresis composite surface protection technique |
| CN102828208A (en) * | 2012-09-10 | 2012-12-19 | 太原理工大学 | Method for electroplating zinc in neodymium iron boron magnet ionic liquid |
| CN102994999A (en) * | 2012-10-30 | 2013-03-27 | 宁波永久磁业有限公司 | Phosphating treatment method for surface of sintered neodymium-iron-boron material |
| CN105648503A (en) * | 2016-03-28 | 2016-06-08 | 钢铁研究总院 | Method for preparing high-weather-resistance high-corrosion-resistance high-abrasion-resistance organic coating for surface of magnet |
| CN107604405A (en) * | 2017-10-23 | 2018-01-19 | 安徽中磁高科有限公司 | Magneto neodymium iron boron magnetic materials electro-plating method |
| CN108048829A (en) * | 2017-12-11 | 2018-05-18 | 宁波韵升股份有限公司 | A kind of electrophoresis method of neodymium iron boron magnetic body |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112663116A (en) * | 2020-12-28 | 2021-04-16 | 宁波韵升股份有限公司 | Electrophoresis black epoxy process for improving corrosion resistance and binding force of neodymium iron boron magnet |
| CN112813437A (en) * | 2021-01-06 | 2021-05-18 | 浙江俊荣五金工业有限公司 | Screw surface treatment process |
| CN114134554A (en) * | 2021-10-27 | 2022-03-04 | 山东鲁玉减震系统技术有限公司 | Electrophoretic coating production method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110983416A (en) | Electrophoretic paint painting process | |
| US9783883B2 (en) | Method for depositing aluminum on a permanent Nd—Fe—B magnet | |
| CN102345150B (en) | Magnesium alloy surface treating method and magnesium alloy prepared by same | |
| US4086153A (en) | Method of producing a composite coated steel sheet | |
| CN104005063A (en) | Method for electroplating zinc and nickel alloy on steel work | |
| CN102115899B (en) | Tin-nickel alloy plating solution used for plating neodymium iron boron permanent magnet material and method for plating neodymium iron boron permanent magnet material by adopting same | |
| CN107740168A (en) | A kind of efficient corrosion resisting Zinc phosphating solution and preparation method thereof | |
| CN113088966B (en) | Magnesium alloy composite coating and preparation method thereof | |
| CN105695974A (en) | NdFeB zinc series phosphating solution and application method thereof | |
| CN112663116A (en) | Electrophoresis black epoxy process for improving corrosion resistance and binding force of neodymium iron boron magnet | |
| CN1421547A (en) | Electroplating of Zn-Ni alloy onto surface of Nd-Fe-B permanent magnet | |
| US3864230A (en) | Pretreating and Electrocoating Metal Products | |
| CN115142055B (en) | Hydrophobic chemical conversion film forming liquid and aluminum alloy surface treatment method | |
| CN115216759B (en) | Hydrophilic chemical conversion film forming liquid and aluminum alloy surface treatment method | |
| CN114921782A (en) | Composite treating agent for surface pretreatment of neodymium iron boron magnet and preparation method and application thereof | |
| KR100853996B1 (en) | Method for Treating the Surface on Magnesium and Its Alloys | |
| CN111945209A (en) | Cathode black electrophoresis method for automobile parts | |
| JP5607450B2 (en) | Stainless steel plate with excellent adhesion of paint film and method for producing the same | |
| GB1569287A (en) | Method of coating steel sheet by electrodeposition | |
| CN103233253B (en) | Black Mn-Fe-P-B composite plating solution as well as using method and film layer formed by solution | |
| CN103897584B (en) | A kind of offshore drilling tool-joint silane surface inorganic agent | |
| CN110846694B (en) | Zinc plating solution | |
| CN112979344B (en) | Antibacterial protective layer prepared on concrete surface based on chemical plating method and preparation method | |
| CN1249541A (en) | Surficially roughened foam nickel and its preparing process | |
| CN116971012A (en) | Low-voltage cathode electrophoretic coating process for 5XXX and 6XXX aluminum alloy automobile covering parts |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200410 |