CN107815718A - A kind of magnesium alloy differential arc oxidation method - Google Patents
A kind of magnesium alloy differential arc oxidation method Download PDFInfo
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- CN107815718A CN107815718A CN201711067891.2A CN201711067891A CN107815718A CN 107815718 A CN107815718 A CN 107815718A CN 201711067891 A CN201711067891 A CN 201711067891A CN 107815718 A CN107815718 A CN 107815718A
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- Prior art keywords
- magnesium alloy
- arc oxidation
- differential arc
- oxidation method
- aqueous solution
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/30—Anodisation of magnesium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
Abstract
The invention discloses a kind of magnesium alloy differential arc oxidation method, comprise the following steps：Magnesium alloy is put into degreaser and soaked, then cleans magnesium alloy with weakly acidic water, and dry；Prepare mixed aqueous solution of the pH value for 9 10 phosphate, silicate and borate in electrolytic cell, and vinyl, silicone resin, butyl stearate and diaminodiphenyl-methane are added in mixed aqueous solution, using magnesium alloy as anode after being sufficiently mixed, by the use of stainless steel as negative electrode, it is put into mixed aqueous solution and carries out differential arc oxidation；The good magnesium alloy of differential arc oxidation is put into deionized water and cleaned, rear drying, closing.Magnesium alloy after being handled by magnesium alloy differential arc oxidation method, surface forms ceramic membrane, film hardness is high, compactness is good, corrosion resistance is strong, good insulating, film layer and the adhesion of base metal are strong so that wearability, corrosion resistance, resistance to sudden heating and the insulating properties of Mg alloy surface are greatly improved.
Description
Technical field
The present invention relates to magnesium alloy differential arc oxidation technical field, more particularly to a kind of magnesium alloy differential arc oxidation method.
Background technology
Magnesium alloy have density is small, specific strength is high, processing welding and damping capacity is good and dimensionally stable, it is cheap,
The advantages that easy to be recycled, have in multiple fields such as automobile, Aero-Space, electronics, military affairs, communication, optical instrument, computers
Wide application prospect, it is described as " green engineering material of 21 century most development potentiality and future ".But the chemistry of magnesium alloy
Activity is very big, easily corrodes applied to various environment, this largely hinders the application of magnesium alloy.
The method that improving corrosion resistance of magnesium alloy can commonly use mainly has：Organic layer or organic coating, the coat of metal, alloying
Or surface alloying, anodic oxidation and differential arc oxidation etc..The differential arc oxidization technique particularly occurred in recent years, is existed using magnesium alloy
Surface-discharge is acted in electrolyte, and the ceramic layer based on magnesia is formed in Mg alloy surface.The technology has layered efficiency
Height, it is firmly combined with, layer by layer intensity, corrosion-resistant height, is shown in terms of the anti-corrosion layer for preparing magnesium alloy peculiar with matrix layer by layer
Advantage.In differential arc oxidization technique, electrolyte prescription determines that electrical conductivity, arcing voltage and the oxide layer of solution introduce element
Type, so as to be had a major impact to oxide layer growth speed, layer by layer structure and composition, largely influence combination layer by layer
Intensity and decay resistance.
The composition of micro-arc oxidation electrolyte can be divided into conducting salt, buffer, additive etc. according to its effect.Conducting salt species
The electrical conductivity of solution is influenceed with concentration, and determines the species and content of oxide deposition element；Under the same conditions, solution electricity
Conductance is high, and arcing voltage is low during oxidation, and oxide layer growth speed is fast.Buffer is mixed solution or the weak base by weak acid and its salt
And its system that the mixed solution of salt is formed, buffer can keep certain electrolyte ph scope, stable differential arc oxidation
Technique and layer by layer quality, extend the service life of electrolyte.And the additive in electrolyte, to the knot of oxidation technology and oxide layer
Structure also has a major impact.
More preferable diaphragm can be obtained by finding suitable electrolyte prescription, improve resistance to corrosion.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of magnesium alloy differential arc oxidation method solve conventional process
The problem of method treatment effect is short of.
The technical problems to be solved by the invention are realized using following technical scheme：
A kind of magnesium alloy differential arc oxidation method, comprises the following steps
A, magnesium alloy is put into degreaser and soaks 15-20min, then clean magnesium alloy with weakly acidic water, and dry
It is dry；
B, mixed aqueous solution of the pH value for 9-10 phosphate, silicate and borate is prepared in electrolytic cell, and mixed
Vinyl, silicone resin, butyl stearate and diaminodiphenyl-methane are added in Heshui solution, by step after being sufficiently mixed
The magnesium alloy that a is obtained, by the use of stainless steel as negative electrode, is put into mixed aqueous solution as anode and carries out differential arc oxidation；
C, the good magnesium alloy of differential arc oxidation is put into deionized water and cleaned, rear drying, closing.
Further improvement is that the degreaser is that sodium molybdate, sodium acid carbonate, the mixing of ethylene glycol and polysorbate are molten
Liquid.
Further improvement is that the mass ratio between the sodium molybdate, sodium acid carbonate, ethylene glycol and polysorbate is 4:3:
1:1。
Further improvement is that the mass concentration of each composition is distinguished in the mixed aqueous solution
Phosphate 4-15g/L
Silicate 8-20g/L
Borate 3-10g/L.
Further improvement is that between the vinyl, silicone resin, butyl stearate and diaminodiphenyl-methane
Mass ratio be 3-3.5:2-2.3:1-1.2:0.8-1.2.
Further improvement is that the current density of the differential arc oxidation is 0.05-0.1A/dm2, processing time 25-
40min。
Further improvement is that the material that the electrolytic cell is selected is one kind in PP or PVC, and in the inside of electrolytic cell
Provided with cooling circulating water, for controlling temperature.
The beneficial effects of the invention are as follows：Magnesium alloy after the processing of magnesium alloy differential arc oxidation method, surface form ceramic membrane,
Film hardness is high, compactness is good, and corrosion resistance is strong, good insulating, and the adhesion of film layer and base metal is strong so that magnesium alloy table
Wearability, corrosion resistance, resistance to sudden heating and the insulating properties in face are greatly improved.The microarc oxidation solution of the present invention
Oxidation is strong, and contamination resistance is strong, cost-effective without often changing.
Embodiment
In order that the technical means, the inventive features, the objects and the advantages of the present invention are easy to understand, tie below
Specific embodiment is closed, the present invention is expanded on further.
Embodiment 1
A kind of magnesium alloy differential arc oxidation method, comprises the following steps
A, magnesium alloy is put into degreaser and soaks 15min, then clean magnesium alloy with weakly acidic water, and dry.
Degreaser therein is the mixed solution of sodium molybdate, sodium acid carbonate, ethylene glycol and polysorbate, and sodium molybdate, sodium acid carbonate, second
Mass ratio between glycol and polysorbate is 4:3:1:1.
B, mixed aqueous solution of the pH value for 9 phosphate, silicate and borate is prepared in electrolytic cell, and in mixing water
Vinyl, silicone resin, butyl stearate and diaminodiphenyl-methane are added in solution, obtains step a after being sufficiently mixed
The magnesium alloy arrived, by the use of stainless steel as negative electrode, is put into mixed aqueous solution as anode and carries out differential arc oxidation, current density is
0.05A/dm2, processing time 40min.
The mass concentration difference of each composition wherein in mixed aqueous solution
Phosphate 4g/L
Silicate 8g/L
Borate 3g/L.
Mass ratio wherein between vinyl, silicone resin, butyl stearate and diaminodiphenyl-methane is 3:2:
1:0.8。
C, the good magnesium alloy of differential arc oxidation is put into deionized water and cleaned, rear drying, closing.
Embodiment 2
A kind of magnesium alloy differential arc oxidation method, comprises the following steps
A, magnesium alloy is put into degreaser and soaks 18min, then clean magnesium alloy with weakly acidic water, and dry.
Degreaser therein is the mixed solution of sodium molybdate, sodium acid carbonate, ethylene glycol and polysorbate, and sodium molybdate, sodium acid carbonate, second
Mass ratio between glycol and polysorbate is 4:3:1:1.
B, prepare mixed aqueous solution of the pH value for 9.5 phosphate, silicate and borate in electrolytic cell, and mixing
Vinyl, silicone resin, butyl stearate and diaminodiphenyl-methane are added in the aqueous solution, by step a after being sufficiently mixed
Obtained magnesium alloy by the use of stainless steel as negative electrode, is put into mixed aqueous solution and carries out differential arc oxidation as anode, current density
For 0.07A/dm2, processing time 30min.
The mass concentration difference of each composition wherein in mixed aqueous solution
Phosphate 12g/L
Silicate 15g/L
Borate 6g/L.
Mass ratio wherein between vinyl, silicone resin, butyl stearate and diaminodiphenyl-methane is 3:
2.3:1.2:1.2。
C, the good magnesium alloy of differential arc oxidation is put into deionized water and cleaned, rear drying, closing.
Embodiment 3
A kind of magnesium alloy differential arc oxidation method, comprises the following steps
A, magnesium alloy is put into degreaser and soaks 20min, then clean magnesium alloy with weakly acidic water, and dry.
Degreaser therein is the mixed solution of sodium molybdate, sodium acid carbonate, ethylene glycol and polysorbate, and sodium molybdate, sodium acid carbonate, second
Mass ratio between glycol and polysorbate is 4:3:1:1.
B, prepare mixed aqueous solution of the pH value for 10 phosphate, silicate and borate in electrolytic cell, and mixing
Vinyl, silicone resin, butyl stearate and diaminodiphenyl-methane are added in the aqueous solution, by step a after being sufficiently mixed
Obtained magnesium alloy by the use of stainless steel as negative electrode, is put into mixed aqueous solution and carries out differential arc oxidation as anode, current density
For 0.1A/dm2, processing time 25min.
The mass concentration difference of each composition wherein in mixed aqueous solution
Phosphate 15g/L
Silicate 20g/L
Borate 10g/L.
Mass ratio wherein between vinyl, silicone resin, butyl stearate and diaminodiphenyl-methane is 3.5:
2.3:1:1.2。
C, the good magnesium alloy of differential arc oxidation is put into deionized water and cleaned, rear drying, closing.
Preferably, the material that above-mentioned electrolytic cell is selected is one kind in PP or PVC, and is provided with cooling in the inside of electrolytic cell
Recirculated water, for controlling temperature, ensureing will not be with the progress of differential arc oxidation, and temperature constantly raises in groove, influences magnesium alloy
Handle quality.
Magnesium alloy after being handled by the various embodiments described above, it forms the ceramic membrane of densification on surface, and being measured can be with
It was found that its insulaion resistance is more than 120M Ω, microhardness has reached 2100-2350HV, in wearability, corrosion resistance, heat-resisting punching
Hitting property and insulating properties are greatly improved.
The basic principles, principal features and advantages of the present invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, the original for simply illustrating the present invention described in above-described embodiment and specification
Reason, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (7)
- A kind of 1. magnesium alloy differential arc oxidation method, it is characterised in that：Comprise the following stepsA, magnesium alloy is put into degreaser and soaks 15-20min, then clean magnesium alloy with weakly acidic water, and dry；B, mixed aqueous solution of the pH value for 9-10 phosphate, silicate and borate is prepared in electrolytic cell, and in mixing water Vinyl, silicone resin, butyl stearate and diaminodiphenyl-methane are added in solution, obtains step a after being sufficiently mixed The magnesium alloy arrived, by the use of stainless steel as negative electrode, is put into mixed aqueous solution as anode and carries out differential arc oxidation；C, the good magnesium alloy of differential arc oxidation is put into deionized water and cleaned, rear drying, closing.
- A kind of 2. magnesium alloy differential arc oxidation method according to claim 1, it is characterised in that：The degreaser is molybdic acid Sodium, sodium acid carbonate, the mixed solution of ethylene glycol and polysorbate.
- A kind of 3. magnesium alloy differential arc oxidation method according to claim 2, it is characterised in that：The sodium molybdate, bicarbonate Mass ratio between sodium, ethylene glycol and polysorbate is 4:3:1:1.
- A kind of 4. magnesium alloy differential arc oxidation method according to claim 1, it is characterised in that：It is each in the mixed aqueous solution The mass concentration difference of compositionPhosphate 4-15g/LSilicate 8-20g/LBorate 3-10g/L.
- A kind of 5. magnesium alloy differential arc oxidation method according to claim 1, it is characterised in that：The vinyl, silicone Mass ratio between resin, butyl stearate and diaminodiphenyl-methane is 3-3.5:2-2.3:1-1.2:0.8-1.2.
- A kind of 6. magnesium alloy differential arc oxidation method according to claim 1, it is characterised in that：The electric current of the differential arc oxidation Density is 0.05-0.1A/dm2, processing time 25-40min.
- A kind of 7. magnesium alloy differential arc oxidation method according to claim 1, it is characterised in that：The material that the electrolytic cell is selected Expect for one kind in PP or PVC, and cooling circulating water is provided with the inside of electrolytic cell, for controlling temperature.
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| CN201711067891.2A CN107815718A (en) | 2017-11-03 | 2017-11-03 | A kind of magnesium alloy differential arc oxidation method |
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| CN201711067891.2A CN107815718A (en) | 2017-11-03 | 2017-11-03 | A kind of magnesium alloy differential arc oxidation method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040028908A (en) * | 2004-03-18 | 2004-04-03 | (주)케이엠티 | the synthesis of electrolyte for coating of magnesium and magnesium-alloy |
| CN102041541A (en) * | 2010-11-30 | 2011-05-04 | 沈阳理工大学 | Method for preparing magnesium alloy micro-arc oxidation film by silicon dioxide sol-impregnation micro-arc oxidation method |
| CN103173838A (en) * | 2013-04-11 | 2013-06-26 | 江西科技师范大学 | Magnesium alloy micro-arc oxidation electrolyte and micro-arc oxidation method |
-
2017
- 2017-11-03 CN CN201711067891.2A patent/CN107815718A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040028908A (en) * | 2004-03-18 | 2004-04-03 | (주)케이엠티 | the synthesis of electrolyte for coating of magnesium and magnesium-alloy |
| CN102041541A (en) * | 2010-11-30 | 2011-05-04 | 沈阳理工大学 | Method for preparing magnesium alloy micro-arc oxidation film by silicon dioxide sol-impregnation micro-arc oxidation method |
| CN103173838A (en) * | 2013-04-11 | 2013-06-26 | 江西科技师范大学 | Magnesium alloy micro-arc oxidation electrolyte and micro-arc oxidation method |
Non-Patent Citations (2)
| Title |
|---|
| 刘静安 等: "《简明镁合金材料手册》", 30 August 2016, 冶金工业出版社 * |
| 杨国英 等: ""镁合金微弧氧化添加剂研究"", 《绍兴文理学院学报》 * |
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Application publication date: 20180320 |