CN110512186A - A kind of alramenting passivating method of sintered NdFeB magnet metal coating - Google Patents
A kind of alramenting passivating method of sintered NdFeB magnet metal coating Download PDFInfo
- Publication number
- CN110512186A CN110512186A CN201910947704.2A CN201910947704A CN110512186A CN 110512186 A CN110512186 A CN 110512186A CN 201910947704 A CN201910947704 A CN 201910947704A CN 110512186 A CN110512186 A CN 110512186A
- Authority
- CN
- China
- Prior art keywords
- metal coating
- alramenting
- ndfeb magnet
- sintered ndfeb
- coating
- 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
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/02—Pretreatment of the material to be coated
- C23C14/021—Cleaning or etching treatments
- C23C14/022—Cleaning or etching treatments by means of bombardment with energetic particles or radiation
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
- C23C14/165—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon by cathodic sputtering
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/35—Sputtering by application of a magnetic field, e.g. magnetron sputtering
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/58—After-treatment
- C23C14/5846—Reactive treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention discloses a kind of alramenting passivating methods of sintered NdFeB magnet metal coating.For sintered NdFeB magnet surface metal Al coating, by high temperature gas phase method, realize that the alramenting of metal coating is passivated using sodium hypophosphite as phosphorus source, to improve the corrosion resisting property of coating.The more traditional Cr VI of this method, trivalent chromium liquid phase deactivation method have better environmental suitability, the sewage discharge of heavy metal free ion, and fine and close and uniform phosphatization passivating film can be formed in metal coating surface, more efficient corrosion protection effect is provided for sintered NdFeB magnet.
Description
Technical field
The invention belongs to magnetic material surfacecti proteons, anti-corrosion coating field, and in particular to a kind of sintered NdFeB magnet metal
The alramenting passivating method of coating.
Background technique
NdFeB permanent-magnet material is widely used in Aeronautics and Astronautics, magnetic suspension with its high magnetic property and higher cost performance
The high-tech areas such as train, magnetic medical technology.China's rare earth resources proven reserve accounts for 80% or so of world's gross reserves, this makes
It is located at catbird seat in the competition of rare earth permanent magnet field.But there is three-phase using the sintered NdFeB magnet of powder metallurgic method preparation
Structure (specifically includes that main phase, rich-Nd phase and richness B phase), and the potential difference between each phase is larger, especially the electrification of rich-Nd phase
The property learned is most strong, is easily corroded in moist, high temperature and electrochemical environment, seriously limits sintered NdFeB magnet application neck
The further expansion in domain.Therefore, it is necessary to take measures to improve the corrosion resistance of sintered NdFeB magnet.At present in industrial production
The main corrosion resisting property that magnet is improved using addition alloying and surfacecti proteon facture, but alloying can be in certain journey
The magnetic property of magnet is reduced on degree, and effect is unobvious.Therefore, mainly using surfacecti proteon facture in magnet in industrial production
Protective coating is added on surface, can significantly improve the corrosion resisting property of magnet.
Protective coating is to slow down the corrosion of magnet by hindering directly to contact between corrosive medium and matrix.Currently, burning
It is as follows to tie the common safeguard procedures of NdFeB magnet surface: plating, chemical plating, organic coating, physical vapour deposition (PVD) and Composite Coatings
Layer.Being aluminized to neodymium iron boron surface with physical vapour deposition (PVD) is the effective anticorrosion means of neodymium iron boron magnetic body, and gained coating is in silvery white
Color, surface is careful, is well bonded with magnet, and corrosion resistance is higher, has good electrochemical protection performance.Metal
The surface passivation of coating is a kind of mode of common raising corrosion resisting property, by being reacted with passivator such as Cr VI, trivalent chromiums,
One layer of fine and close conversion film is formed in metal coating surface, its corrosion resisting property can be effectively improved.But the severe environments of chrome waste liquid
Pollution, application is restricted, gradually replaced other low pollution techniques.
Therefore, the alramenting passivating method for developing a kind of sintered NdFeB magnet metal coating has important economic effect
Benefit, social benefit and environmental benefit.
Summary of the invention
The present invention is tight for sintered NdFeB magnet surface metal corrosion resistance coating energy difference and the pollution of conventional passivation process environments
The problem of weight, provides a kind of alramenting passivating method of sintered NdFeB magnet metal coating.
To achieve the above object, the technical solution used in the present invention is as follows:
A kind of alramenting passivating method of sintered NdFeB magnet metal coating, by high temperature gas phase method, with ortho phosphorous acid
Sodium is the passivation that phosphorus source realizes metal coating surface, the specific steps are as follows:
(1) pre-treatment of sample: NdFeB matrix is acidified with nitric acid solution, is ultrasonically treated after cleaning；
(2) preparation of metal coating: by after acidification the shove charge of NdFeB matrix, vacuumize, then carry out Ion Cleaning, to from
NdFeB matrix magnetron sputtering after son cleaning, carries out vacuum evaporation after cooling, prepares Al coating on Sintered NdFeB surface.
(3) the alramenting passivation of metal coating: the NdFeB magnet and sodium hypophosphite that coat metal coating are set respectively
In in leakproofness furnace, being passed through inert gas as current-carrying gas, high-temperature calcination is carried out with furnace Slow cooling and completes metal coating
Alramenting passivation.
Preferably, the nitric acid solution that acidization is 3% using concentration in step (1), acidificatoin time 5-60s,
The ultrasonic cleaning time is 1-10min.
Preferably, the cleaning of step (2) intermediate ion is using the argon ion generated in vacuum chamber, time 10-60min.
Preferably, the magnetron sputtering time is 10-60min in step (2).
Preferably, the vacuum evaporation time is 10-60min in step (2), and Al coating layer thickness is 15-25 μm.
Preferably, the amount of the sodium hypophosphite in step (3) is 1:100~20:100 come really according to the element ratio of P and Al
It is fixed.
Preferably, the inert gas in step (3) be argon gas, nitrogen or its mixed gas, current-carrying throughput be 50~
200sccm；
Preferably, the high-temperature calcination temperature in step (3) is 250~500 DEG C, and soaking time is 0.5~3h.
Compared with prior art, the beneficial effects of the present invention are embodied in:
The alramenting passivating method of sintered NdFeB magnet metal coating of the invention, can be in metal coating surface shape
At fine and close and uniform phosphatization passivating film, more efficient corrosion protection effect is provided for sintered NdFeB magnet.Compared to biography
The Cr VI of system, trivalent chromium passivation method, the present invention have better environmental suitability, the sewage discharge of heavy metal free ion.
Detailed description of the invention
Fig. 1 is PVDAl coating SEM shape appearance figure, and (i) (ii) is the original sample figure without phosphatization, and (iii) (iv) is embodiment 1
PVDAl coating SEM shape appearance figure after phosphatization passivation；
Fig. 2 is that the potentiodynamic polarization of the PVD Al coating of Al coating and the preparation of embodiment 1,2,3,4,5 without phosphatization is bent
Line.
Specific embodiment
The present invention is further illustrated with reference to embodiments, it should be noted that is only to present inventive concept
Example and explanation, affiliated those skilled in the art make various modifications to described specific embodiment
Or supplement or be substituted in a similar manner, as long as it does not deviate from the concept of invention or surmount model defined in the claims
It encloses, is regarded as falling into protection scope of the present invention.
Illustrate the contents of the present invention below in conjunction with specific embodiments.
Embodiment 1:
(1) after NdFeB matrix being cleaned 30s with the nitric acid solution that concentration is 3%, with dehydrated alcohol ultrasound 2min；
(2) by after acidification the shove charge of NdFeB matrix, vacuumize, using the argon ion generated in vacuum chamber to matrix carry out
Bombardment, time 30min；To the NdFeB matrix magnetron sputtering 20min after Ion Cleaning, vacuum evaporation is carried out after cooling
20min prepares Al coating on Sintered NdFeB surface, and Al coating layer thickness is about 20 μm；
(2) the NdFeB magnet and sodium hypophosphite that coat metal coating are sequentially placed into the burning boat in tube furnace, are passed through
Ar gas is 300 DEG C, soaking time 2h as current-carrying gas, flow 100sccm, heating temperature, with furnace Slow cooling, completes gold
Belong to the alramenting passivation of coating.
Comparative examples are the Al coating on the sintered NdFeB magnet surface being passivated without phosphatization, i.e. step (3) product.Through
It tests, corrosion potential is -1.15V in electrochemical corrosion test, and corrosion current density is 82.8 μ Acm-2, when salt mist experiment
Between be 96h.
It is -0.8V, self-corrosion electricity according to corrosion potential in the Al coating electrochemical corrosion test after the passivation of 1 phosphatization of embodiment
Current density is 0.144 μ Acm-2, the salt mist experiment time is 144h, and synthesis corrosion resisting property is substantially better than comparative examples.
Embodiment 2:
The preparation method is the same as that of Example 1 for the present embodiment, the difference is that 250 DEG C of heating temperature in step (2).
After tested, according to the Al coating after the passivation of 2 phosphatization of embodiment, in electrochemical corrosion test corrosion potential be-
1.10V, corrosion current density are 60 μ Acm-2, the salt spray test time is 120h.
Embodiment 3:
The preparation method is the same as that of Example 1 for the present embodiment, the difference is that 270 DEG C of heating temperature in step (2).
After tested, according to the Al coating after the passivation of 3 phosphatization of embodiment, in electrochemical corrosion test corrosion potential be-
0.83V, corrosion current density are 4.225 μ Acm-2, the salt spray test time is 120h, and synthesis corrosion resisting property is substantially better than
Comparative examples.
Embodiment 4
The preparation method is the same as that of Example 1 for the present embodiment, the difference is that 320 DEG C of heating temperature in step (2).
It after tested, is -0.85V according to corrosion potential in the Al coating electrochemical corrosion test after the passivation of 4 phosphatization of embodiment,
Corrosion current density is 0.3 μ Acm-2, the salt spray test time is 120h, and synthesis corrosion resisting property is substantially better than control and implements
Example.
Embodiment 5
The preparation method is the same as that of Example 1 for the present embodiment, the difference is that 350 DEG C of heating temperature in step (2).
It after tested, is -1.02V according to corrosion potential in the Al coating electrochemical corrosion test after the passivation of 5 phosphatization of embodiment,
Corrosion current density is 13.25 μ Acm-2, the salt spray test time is 96h.
Claims (9)
1. a kind of alramenting passivating method of sintered NdFeB magnet metal coating, it is characterised in that: by high temperature gas phase method,
The passivation of metal coating surface is realized using sodium hypophosphite as phosphorus source.
2. a kind of alramenting passivating method of sintered NdFeB magnet metal coating as described in claim 1, feature exist
In: specific step is as follows:
(1) pre-treatment of sample: NdFeB matrix is acidified with nitric acid solution, is ultrasonically treated after cleaning；
(2) preparation of metal coating: by after acidification the shove charge of NdFeB matrix, vacuumize, then carry out Ion Cleaning, it is clear to ion
NdFeB matrix magnetron sputtering after washing, carries out vacuum evaporation after cooling, prepares Al coating on Sintered NdFeB surface；
(3) the alramenting passivation of metal coating: the NdFeB magnet and sodium hypophosphite that coat metal coating are sequentially placed into close
In Feng Xinglu, inert gas is passed through as current-carrying gas, high-temperature calcination is carried out with furnace Slow cooling and completes the surface of metal coating
Phosphatization passivation.
3. a kind of alramenting passivating method of sintered NdFeB magnet metal coating as claimed in claim 2, feature exist
In: concentration of nitric acid is 1%-6%, acidificatoin time 5-60s, ultrasonic time 1-10min in step (1).
4. a kind of alramenting passivating method of sintered NdFeB magnet metal coating as claimed in claim 2, feature exist
In: step (2) intermediate ion is cleaned using the argon ion generated in vacuum chamber, time 10-60min.
5. a kind of alramenting passivating method of sintered NdFeB magnet metal coating as claimed in claim 2, feature exist
In: the magnetron sputtering time is 10-60min in step (2).
6. a kind of alramenting passivating method of sintered NdFeB magnet metal coating as claimed in claim 2, feature exist
In: the vacuum evaporation time is 10-60min in step (2), and Al coating layer thickness is 15-25 μm.
7. a kind of alramenting passivating method of sintered NdFeB magnet metal coating as claimed in claim 2, feature exist
In: the amount of the sodium hypophosphite in step (3) is determined according to the element ratio of P and Al is 1:100~20:100.
8. a kind of alramenting passivating method of sintered NdFeB magnet metal coating as claimed in claim 2, feature exist
In: the inert gas in step (3) is argon gas, nitrogen or its mixed gas, and current-carrying throughput is 50~200sccm.
9. a kind of alramenting passivating method of sintered NdFeB magnet metal coating as claimed in claim 2, feature exist
In: the high-temperature calcination temperature in step (3) is 250~500 DEG C, and soaking time is 0.5~3h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910947704.2A CN110512186A (en) | 2019-10-08 | 2019-10-08 | A kind of alramenting passivating method of sintered NdFeB magnet metal coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910947704.2A CN110512186A (en) | 2019-10-08 | 2019-10-08 | A kind of alramenting passivating method of sintered NdFeB magnet metal coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110512186A true CN110512186A (en) | 2019-11-29 |
Family
ID=68634159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910947704.2A Pending CN110512186A (en) | 2019-10-08 | 2019-10-08 | A kind of alramenting passivating method of sintered NdFeB magnet metal coating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110512186A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114686863A (en) * | 2022-03-23 | 2022-07-01 | 合肥工业大学 | Preparation method for forming passivation layer by Al/NdFeB magnet |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031522A (en) * | 2010-12-15 | 2011-04-27 | 白雪铠 | Neodymium-iron-boron magnet of aluminum or aluminum alloy composite coating and preparation method thereof |
| CN108311166A (en) * | 2018-02-02 | 2018-07-24 | 武汉科技大学 | A kind of two dimension transition metal phosphide and preparation method thereof |
-
2019
- 2019-10-08 CN CN201910947704.2A patent/CN110512186A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031522A (en) * | 2010-12-15 | 2011-04-27 | 白雪铠 | Neodymium-iron-boron magnet of aluminum or aluminum alloy composite coating and preparation method thereof |
| CN108311166A (en) * | 2018-02-02 | 2018-07-24 | 武汉科技大学 | A kind of two dimension transition metal phosphide and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 强颖怀主编: "《材料表面工程技术》", 31 May 2016, 中国矿业大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114686863A (en) * | 2022-03-23 | 2022-07-01 | 合肥工业大学 | Preparation method for forming passivation layer by Al/NdFeB magnet |
| CN114686863B (en) * | 2022-03-23 | 2024-01-23 | 合肥工业大学 | Preparation method for forming passivation layer by Al/NdFeB magnet |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106191711B (en) | A kind of iron-based amorphous powder and its preparation method and application | |
| CN102808210B (en) | Micro-arc oxidation surface treatment method and product prepared by same | |
| CN102041468B (en) | Preparation method of iron-based amorphous coating | |
| CN102732936B (en) | Method for preparing silicon oxide ceramic coatings on steel member through electrophoretic deposition | |
| CN107937893B (en) | Environment-friendly passivation solution for aluminum or aluminum alloy and preparation method and treatment process thereof | |
| CN108330472A (en) | A method of the double hydroxy metal oxide coating corrosion resistances of enhancing Mg alloy surface | |
| CN101498026B (en) | Electrolytic solution for magnesium alloy anodicoxidation treatment and method for surface treatment of magnesium alloy | |
| CN102787300A (en) | Cr/CrAlN gradient coating technology of supercritical water-cooled reactor fuel can surface | |
| CN102199767A (en) | Cr-free F-free color passivation solution and passivation method for electroplated Zn-Ni alloy plating layer | |
| US20050057004A1 (en) | Stainless steel plate, method of manufacturing the same, and rubber-coated stainless steel plate gasket | |
| Fu et al. | Electrochemical behaviors of magnesium alloy with phosphate conversion coating in NaCl solutions | |
| CN110512186A (en) | A kind of alramenting passivating method of sintered NdFeB magnet metal coating | |
| CN102747360A (en) | Chromium-free passivation method for galvanized steel sheet by using molybdate/polyphosphate composite system | |
| CN107740074A (en) | Ce Ni Mo P/Go Composite electroless deposit layers that a kind of ultrasonic wave aids in double complexing agents and preparation method thereof | |
| CN109686558A (en) | A kind of preparation method of high-corrosion resistance Sintered NdFeB magnet | |
| CN101724833A (en) | Nickel copper phosphorus plating bath for permanent magnet material and permanent magnet material surface treatment method thereof | |
| CN110527994A (en) | A kind of without phosphorus chemical conversion agent based on fluorine zirconic acid, preparation method and application method | |
| CN102400145A (en) | Surface treatment method for mechanically coating zinc, aluminum and nickel on neodymium iron boron permanent magnet material | |
| CN106222632A (en) | A kind of environment-friendly type is anti-corrosion, the preparation method of wear-resistant magnesium alloy layer | |
| CN114481012B (en) | Multielement alloy co-permeation agent for steel member and corrosion prevention process thereof | |
| CN111074250A (en) | High-corrosion-resistance stable chemical nickel plating solution for aluminum alloy surface, and preparation method and application thereof | |
| CN106521466B (en) | The preparation method of titanium or titanium alloy surface chemical composition coating is induced using electric coupling | |
| Liu et al. | Construction of Al-BTA passivation film on the surface of electrolytic copper foil and study of corrosion resistance mechanism | |
| CN104313554A (en) | Surface anticorrosion wear-resistant composite coating for cylinder sleeve of automobile engine applying bio-oil | |
| CN102041543A (en) | Preparation method of fullerene/metal composite film on metal surface |
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 |
Application publication date: 20191129 |
|
| RJ01 | Rejection of invention patent application after publication |