CN109023333B - Magnesium alloy moisture-proof thermal conducting-anti-corrosion chemical composition coating preparation process - Google Patents
Magnesium alloy moisture-proof thermal conducting-anti-corrosion chemical composition coating preparation process Download PDFInfo
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- CN109023333B CN109023333B CN201810957046.0A CN201810957046A CN109023333B CN 109023333 B CN109023333 B CN 109023333B CN 201810957046 A CN201810957046 A CN 201810957046A CN 109023333 B CN109023333 B CN 109023333B
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- 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
- C23C22/40—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 molybdates, tungstates or vanadates
- C23C22/42—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 molybdates, tungstates or vanadates containing also phosphates
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- 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
- C23C22/78—Pretreatment of the material to be coated
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- 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
- C23G1/12—Light metals
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Abstract
The invention belongs to Magnesium alloy AZ91D fields, provide a kind of preparation process of magnesium alloy moisture-proof thermal conducting-anti-corrosion chemical composition coating, this method combination pickling pre-treatment, chemical conversion treatment prepare conductive-anti-corrosion chemical composition coating of the magnesium alloy suitable for hygrothermal environment；The reasonable two-phase difference in height of Mg alloy surface is assigned by pickling pre-treatment, forms Mg (OH) for α phase2Corrosion product reserves enough growing spaces；The magnesium alloy of pickling pre-treatment passes through the film surface uniform ground that chemical conversion treatment obtains, and corrosion resistance is superior；The magnesium alloy of pickling pre-treatment is good by the film layer electric conductivity that chemical conversion treatment obtains, and also still has good conductive property under hygrothermal environment.The preparation process has many advantages, such as simple, easy to operate and at low cost, and the engineering application to magnesium alloy in 3C Product field is of great significance.
Description
Technical field
The invention belongs to Magnesium alloy AZ91D field, it is related to a kind of obtain in Mg alloy surface and both anti-corrosion also ensures that conduction
The chemical transforming process of performance.
Background technique
Magnesium alloy has the performances such as excellent physics, mechanics, is widely used in 3C electronic product.Magnesium alloy is maximum
The disadvantage is that perishable: on the one hand causing structure or mechanical property to fail, on the other hand corrosion causes the generation of corrosion product to cause
The failure (the problem of electronics industry is paid special attention to) of electrical contact.Therefore it needs to apply protective coating to magnesium alloy, and the coating is not
It can sacrificial surface electric conductivity.Compared to the processing of other protective coatings, it is at low cost, easy to operate, easy that chemical conversion treatment has
The advantages that realization.Therefore, the urgent need of 3C electronic industry has the magnesium alloy chemical conversion film of high anti-corrosion and high conductivity.
Damp heat test be mainly used for examine electronic product in thermal extremes high humidity environment material whether burn into properties of product
A kind of whether normally common test means.In the high temperature in subtropical zone and the torrid zone, high humidity environment, magnesium alloy surface chemical conversion
The failure of film layer electric conductivity, hinders AZ91D magnesium alloy to be widely used in the field 3C.And at present about suitable under hygrothermal environment
The open report quantity of conduction-wear-resistance film layer that magnesium alloy chemical conversion processing is formed is very limited, and covering scope very little, no
It is able to satisfy the application demand of actual components.Therefore, it is badly in need of developing a kind of nontoxic, environment-friendly type magnesium suitable for long-term hygrothermal environment
The treatment process of alloy conductive-is anti-corrosion chemical composition coating.
Summary of the invention
In order to overcome the above deficiency, the technical problems to be solved by the invention are to provide a kind of combination pickling pre-treatment, change
The method for learning conversion processing to prepare conductive-anti-corrosion chemical composition coating of the magnesium alloy suitable for hygrothermal environment.
To achieve the goals above, technical scheme is as follows:
A kind of preparation process of magnesium alloy moisture-proof thermal conducting-anti-corrosion chemical composition coating, includes the following steps:
1) polishing pretreatment: removing Mg alloy surface foreign matter, reduces surface roughness；
2) pickling pre-treatment: it is 30~50 DEG C that the magnesium alloy of step 1), which is dipped in temperature, and concentration is 1ml/L~10ml/L's
1~20min is handled in pickling solution；The pickling solution is the pickling solution that can generate two-phase difference in height, after pickling processes
Deionized water used for magnesium alloy wash until the acid solution of surface noresidue；
3) chemical conversion treatment: by the chemical conversion that the magnesium alloy of step 2) is dipped in 30~80 DEG C of temperature, pH value is 2~4
The magnesium alloy with conductive-anti-corrosion chemical conversion film layer is prepared after handling 5~15min in liquid, then is washed with deionized water
Until the chemical conversion solution of surface noresidue, drying.
Further, the concentration of above-mentioned pickling solution is 1ml/L~3ml/L.
Further, above-mentioned steps 2) in pickling solution include in oxalic acid, sulfuric acid, hydrochloric acid, nitric acid or citric acid one
Kind is two or more.
Further, above-mentioned steps 3) in chemical conversion solution in each component concentration are as follows: 1ml/L~5ml/L phosphoric acid, 30g/
L~60g/L phosphate, 25g/L~55g/L nitrate, 1~4g/L vanadate, 1ml/L~6ml//L emulsifier, 10g/L~
65g/L strong oxidizer.This chemical conversion solution has high oxidative.
Further, above-mentioned phosphate includes: in sodium phosphate, dibasic alkaliine, dihydric phosphate or pyrophosphate
More than one or two kinds of.
Further, above-mentioned nitrate includes: one of sodium nitrate, potassium nitrate, calcium nitrate, zinc nitrate or two kinds
More than.
Further, above-mentioned vanadate includes: one of sodium vanadate, ammonium vanadate, ammonium metavanadate or two or more.
Further, above-mentioned strong oxidizer include: potassium permanganate, ammonium persulfate, in molybdate it is one or two kinds of with
On.
Further, above-mentioned emulsifier include: OP-10, neopelex, lauryl sodium sulfate, in DDB
It is one or two kinds of more than.
Further, above-mentioned steps 1) after polishing pretreatment, reach Mg alloy surface foreign, without greasy dirt, burn into hand
Print and burr.
Main feature of the invention is embodied in:
Thicker chemical composition coating is formed in α phase, which imparts the good corrosion resistance of magnesium alloy thin weak-strong test α phase
Energy；Meanwhile very thin oxidation film is formed in β phase, and β phase protrudes from α phase and becomes " conductive spot ", has chemical composition coating
Good electric conductivity.
Suitably pickling pre-treatment is carried out to magnesium alloy, the difference in height of β phase and α phase can be increased, forms Mg for α phase
(OH)2Corrosion product reserves enough growing spaces.Under damp heat test environment, it can prevent in the Mg and hygrothermal environment in α phase
H2O reacts to form Mg (OH)2Corrosion product is higher than the second phase of β, to improve conduction of the chemical composition coating under hygrothermal environment
Performance.
The beneficial effects of the present invention are embodied in:
(1) the reasonable two-phase difference in height of Mg alloy surface is assigned by pickling pre-treatment, forms Mg (OH) for α phase2Corrosion
Product reserves enough growing spaces；
(2) magnesium alloy of pickling pre-treatment passes through the film surface uniform ground that chemical conversion treatment obtains, corrosion resistance
It can be superior；
(3) the film layer electric conductivity that the magnesium alloy of pickling pre-treatment is obtained by chemical conversion treatment is good, in damp and hot ring
It is also still had good conductive property under border.
(4) preparation process has many advantages, such as engineering simple, easy to operate and at low cost, to magnesium alloy in 3C Product field
Change application to be of great significance.
Detailed description of the invention
Fig. 1 is AZ91D magnesium alloy film layer Cross Section Morphology before and after damp heat test of chemical conversion treatment, (a1) damp heat test
Starting section pattern, Cross Section Morphology after (a2) damp heat test 960h.
Fig. 2 is that the AZ91D magnesium alloy film layer by sulfuric acid washing pre-treatment, chemical conversion treatment is cut before and after damp heat test
Face pattern, (b1) damp heat test starting section pattern, Cross Section Morphology after (b2) damp heat test 960h.
Fig. 3 be AZ91D magnesium alloy with nothing, have contact of the conduction-Corrosion Resistant Film of sulfuric acid washing pre-treatment under damp heat test
Resistance change curves figure.
Fig. 4 is AZ91D magnesium alloy and nothing, has sulfuric acid washing pre-treatment conduction-Corrosion Resistant Film salt mist experiment macro morphology.Its
In the first behavior AZ91D magnesium alloy difference 0h, for 24 hours, the salt mist experiment macro morphology of 48h, before the second behavior is without sulfuric acid washing
Manage conduction-Corrosion Resistant Film difference 0h, for 24 hours, the salt mist experiment macro morphology of 48h, third behavior has sulfuric acid washing pre-treatment conductive-resistance to
Lose film difference 0h, for 24 hours, the salt mist experiment macro morphology of 48h.
Specific embodiment
Embodiment 1:
Preparation method are as follows: sample is casting AZ 91 D magnesium alloys；
1. polishing pretreatment: being polished with sand paper, remove deburring, firm oxide, release agent, casting model powder, cutting oil etc.
Foreign matter reduces surface roughness.
2. pickling pre-treatment: the sample polished is dipped in the sulfuric acid washing solution that concentration that temperature is 30 DEG C is 2ml/L
In, the etching processing time is 5min, and the sample handled well is taken out, and is washed 3 times with deionized water, until removing remained on surface
Sulfuric acid solution.In acidic environment, the second phase of β and α base phase in AZ91D magnesium alloy are due to occurring violent galvanic corrosion effect
5~10 μm of difference in height is formed, the Mg (OH) formed for α base phase in damp heat test2Corrosion product reserves growing space, makes β
The height of two-phase is higher than the height in α base phase after damp heat test.
3. chemical conversion treatment: the AZ91D magnesium alloy sample of sulfuric acid washing pre-treatment is placed in concentration 3ml/L phosphoric acid, 35g/L
Disodium hydrogen phosphate, 40g/L calcium nitrate, 4g/L ammonium metavanadate, 2ml//L emulsifier, the temperature of 40g/L potassium permanganate are 45 DEG C
Processing 10min is carried out in chemical conversion solution.And the pH value of chemical conversion solution maintains 3.3, in chemical conversion process, using stirring
Stick agitating solution is mixed, the uniformity of temperature profile of solution is made, localized hyperthermia is avoided to cause film surface uneven.Chemical conversion treatment
Afterwards, it is washed 3 times with deionized water, removes the remaining chemical conversion solution of film surface, and dry up.Pass through shape after chemical conversion treatment
The brown color film layer uniform, smooth at surface.
4. by Cross Section Morphology Fig. 1,2 it is found that compared with AZ91D magnesium alloy and the chemical composition coating of pickling-free pre-treatment, In
After damp and hot experiment (temperature is 85 DEG C, relative humidity 85%) 960h, the AZ91D through overpickling pre-treatment and chemical conversion treatment
Magnesium alloy chemical conversion film surface β phase is still higher than the height of corrosion product in α phase, and β phase is simultaneously lost " conductive spot ", and film layer has
There is good electric conductivity (Fig. 3).
5. as shown in Figure 4, pickling pre-treatment does not generate apparent shadow to AZ91D magnesium alloy chemical conversion film corrosion resisting property
It rings, ensure that the good corrosion resisting property of film layer.
Embodiment 2:
Preparation method are as follows: sample is casting AZ 91 D magnesium alloys；
1. polishing pretreatment: being polished with sand paper, remove deburring, firm oxide, release agent, casting model powder, cutting oil etc.
Foreign matter reduces surface roughness.
2. pickling pre-treatment: the sample polished is dipped in the sulfuric acid washing solution that concentration that temperature is 30 DEG C is 1ml/L
In, the etching processing time is 1min, and the sample handled well is taken out, and is washed 3 times with deionized water, until removing remained on surface
Sulfuric acid solution.In acidic environment, the second phase of β and α base phase in AZ91D magnesium alloy are due to occurring violent galvanic corrosion effect
5~10 μm of difference in height is formed, the Mg (OH) formed for α base phase in damp heat test2Corrosion product reserves growing space, makes β
The height of two-phase is higher than the height in α base phase after damp heat test.
3. chemical conversion treatment: the AZ91D magnesium alloy sample of sulfuric acid washing pre-treatment is placed in concentration 1ml/L phosphoric acid, 30g/L
Disodium hydrogen phosphate, 25g/L calcium nitrate, 1g/L ammonium metavanadate, 1ml//L emulsifier, the temperature of 10g/L potassium permanganate are 30 DEG C
Processing 10min is carried out in chemical conversion solution.And the pH value of chemical conversion solution maintains 4, in chemical conversion process, utilizes stirring
Stick agitating solution makes the uniformity of temperature profile of solution, and localized hyperthermia is avoided to cause film surface uneven.Chemical conversion treatment
Afterwards, it is washed 3 times with deionized water, removes the remaining chemical conversion solution of film surface, and dry up.Pass through shape after chemical conversion treatment
The brown color film layer uniform, smooth at surface.
4. by Cross Section Morphology Fig. 1,2 it is found that compared with AZ91D magnesium alloy and the chemical composition coating of pickling-free pre-treatment, In
After damp and hot experiment (temperature is 85 DEG C, relative humidity 85%) 960h, the AZ91D through overpickling pre-treatment and chemical conversion treatment
Magnesium alloy chemical conversion film surface β phase is still higher than the height of corrosion product in α phase, and β phase is simultaneously lost " conductive spot ", and film layer has
There is good electric conductivity (Fig. 3).
5. as shown in Figure 4, pickling pre-treatment does not generate apparent shadow to AZ91D magnesium alloy chemical conversion film corrosion resisting property
It rings, ensure that the good corrosion resisting property of film layer.
Embodiment 3:
Preparation method are as follows: sample is casting AZ 91 D magnesium alloys；
1. polishing pretreatment: being polished with sand paper, remove deburring, firm oxide, release agent, casting model powder, cutting oil etc.
Foreign matter reduces surface roughness.
2. pickling pre-treatment: the sample polished is dipped in the sulfuric acid washing solution that concentration that temperature is 50 DEG C is 10ml/L
In, the etching processing time is 20min, and the sample handled well is taken out, and is washed 3 times with deionized water, until removing remained on surface
Sulfuric acid solution.In acidic environment, the second phase of β and α base phase in AZ91D magnesium alloy are because occurring violent galvanic corrosion effect
And the difference in height of 5~10 μm of formation, the Mg (OH) formed for α base phase in damp heat test2Corrosion product reserves growing space, makes β
The height of second phase is higher than the height in α base phase after damp heat test.
3. chemical conversion treatment: the AZ91D magnesium alloy sample of sulfuric acid washing pre-treatment is placed in concentration 5ml/L phosphoric acid, 60g/L
Disodium hydrogen phosphate, 55g/L calcium nitrate, 4g/L ammonium metavanadate, 6ml//L emulsifier, the temperature of 65g/L potassium permanganate are 80 DEG C
Processing 10min is carried out in chemical conversion solution.And the pH value of chemical conversion solution maintains 2, in chemical conversion process, utilizes stirring
Stick agitating solution makes the uniformity of temperature profile of solution, and localized hyperthermia is avoided to cause film surface uneven.Chemical conversion treatment
Afterwards, it is washed 3 times with deionized water, removes the remaining chemical conversion solution of film surface, and dry up.Pass through shape after chemical conversion treatment
The brown color film layer uniform, smooth at surface.
4. by Cross Section Morphology Fig. 1,2 it is found that compared with AZ91D magnesium alloy and the chemical composition coating of pickling-free pre-treatment, In
After damp and hot experiment (temperature is 85 DEG C, relative humidity 85%) 960h, the AZ91D through overpickling pre-treatment and chemical conversion treatment
Magnesium alloy chemical conversion film surface β phase is still higher than the height of corrosion product in α phase, and β phase is simultaneously lost " conductive spot ", and film layer has
There is good electric conductivity (Fig. 3).
5. as shown in Figure 4, pickling pre-treatment does not generate apparent shadow to AZ91D magnesium alloy chemical conversion film corrosion resisting property
It rings, ensure that the good corrosion resisting property of film layer.
As known by the technical knowledge, the present invention can pass through the embodiment party of other essence without departing from its spirit or essential feature
Case is realized.Therefore, embodiment disclosed above, in all respects are merely illustrative, not the only.Institute
Have within the scope of the present invention or in the change being equal in the scope of the present invention and includes by the present invention.
Claims (8)
1. a kind of preparation process of magnesium alloy moisture-proof thermal conducting-anti-corrosion chemical composition coating, which is characterized in that the magnesium alloy is casting
AZ91D magnesium alloy, includes the following steps:
1) polishing pretreatment: removing Mg alloy surface foreign matter, reduces surface roughness；
2) pickling pre-treatment: it is 30~50 DEG C that the magnesium alloy of step 1), which is dipped in temperature, and concentration is the pickling of 1mL/L~10mL/L
1~20min is handled in solution；The pickling solution include one of oxalic acid, sulfuric acid, hydrochloric acid, nitric acid or citric acid or
It is two or more；The pickling solution is the pickling solution that can generate two-phase difference in height, the magnesium alloy after pickling processes spend from
Sub- water washing is until the acid solution of surface noresidue；
3) magnesium alloy of step 2) chemical conversion treatment: is dipped in 30~80 DEG C of temperature, pH value as in 2~4 chemical conversion solution
The magnesium alloy with conductive-anti-corrosion chemical conversion film layer is prepared after 5~15min of processing, each component is dense in chemical conversion solution
Degree are as follows: 1mL/L~5mL/L phosphoric acid, 30g/L~60g/L phosphate, 25g/L~55g/L nitrate, 1~4g/L vanadate,
1mL/L~6mL//L emulsifier, 10g/L~65g/L strong oxidizer；Again with deionized water washing until the chemistry of surface noresidue
Until converting solution, dry up.
2. the preparation process of magnesium alloy moisture-proof thermal conducting-anti-corrosion chemical composition coating according to claim 1, feature exist
In the concentration of the pickling solution is 1mL/L~3mL/L.
3. the preparation process of magnesium alloy moisture-proof thermal conducting-anti-corrosion chemical composition coating according to claim 1, feature exist
In, the phosphate include: one of sodium phosphate, dibasic alkaliine, dihydric phosphate or pyrophosphate or two kinds with
On.
4. the preparation process of magnesium alloy moisture-proof thermal conducting-anti-corrosion chemical composition coating according to claim 1, feature exist
In the nitrate includes: one of sodium nitrate, potassium nitrate, calcium nitrate, zinc nitrate or two or more.
5. the preparation process of magnesium alloy moisture-proof thermal conducting-anti-corrosion chemical composition coating according to claim 1, feature exist
In the vanadate includes: one of sodium vanadate, ammonium vanadate, ammonium metavanadate or two or more.
6. the preparation process of magnesium alloy moisture-proof thermal conducting-anti-corrosion chemical composition coating according to claim 1, feature exist
In, the strong oxidizer include: potassium permanganate, ammonium persulfate, in molybdate it is one or two kinds of more than.
7. the preparation process of magnesium alloy moisture-proof thermal conducting-anti-corrosion chemical composition coating according to claim 1, feature exist
In the emulsifier includes: one of OP-10, neopelex, lauryl sodium sulfate, DDB or two kinds
More than.
8. the preparation process of magnesium alloy moisture-proof thermal conducting-anti-corrosion chemical composition coating according to claim 1, feature exist
In the step 1) reaches Mg alloy surface foreign, without greasy dirt, burn into impression of the hand and burr after polishing pretreatment.
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| CN110408918A (en) * | 2019-07-16 | 2019-11-05 | 北京科技大学 | A kind of film forming conversion fluid and film build method preparing Mg alloy surface anti-corrosion conductive film |
| CN113789508A (en) * | 2021-08-17 | 2021-12-14 | 北京科技大学 | Chemical conversion solution for magnesium alloy surface conductive corrosion-resistant treatment and preparation method thereof |
| CN114411138B (en) * | 2021-12-27 | 2022-09-16 | 东北大学 | Preparation method of magnesium alloy 'extinction-conduction-corrosion-resistant' chemical conversion film |
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|---|---|---|---|---|
| CN101285193A (en) * | 2007-04-09 | 2008-10-15 | 比亚迪股份有限公司 | Acidic solution for treating surface of magnesium alloy and processing method |
| CN101418441A (en) * | 2008-10-28 | 2009-04-29 | 嘉兴中科亚美合金技术有限责任公司 | P-Ca-V composite phosphating solution on magnesium alloy surface and chemical conversion processing method |
| CN107130233A (en) * | 2017-06-19 | 2017-09-05 | 博罗县东明化工有限公司 | ZK61M magnesium alloys conversion film treating agent and its conversion membrane processing method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101285193A (en) * | 2007-04-09 | 2008-10-15 | 比亚迪股份有限公司 | Acidic solution for treating surface of magnesium alloy and processing method |
| CN101418441A (en) * | 2008-10-28 | 2009-04-29 | 嘉兴中科亚美合金技术有限责任公司 | P-Ca-V composite phosphating solution on magnesium alloy surface and chemical conversion processing method |
| CN107130233A (en) * | 2017-06-19 | 2017-09-05 | 博罗县东明化工有限公司 | ZK61M magnesium alloys conversion film treating agent and its conversion membrane processing method |
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