CN109385629A - A kind of magnesium alloy high corrosion-resistant passivator and its passivation technology - Google Patents
A kind of magnesium alloy high corrosion-resistant passivator and its passivation technology Download PDFInfo
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- CN109385629A CN109385629A CN201811210982.1A CN201811210982A CN109385629A CN 109385629 A CN109385629 A CN 109385629A CN 201811210982 A CN201811210982 A CN 201811210982A CN 109385629 A CN109385629 A CN 109385629A
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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
- C23C22/44—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 fluorides or complex fluorides
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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
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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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Abstract
The invention discloses a kind of magnesium alloy high corrosion-resistant passivator, it include following component: inorganic acid according to mass parts: 1-15 parts, complexing agent: 1-20 parts, rare earth metal salt: 1-10 parts, alkali salt: 1-10 parts, Organic Alcohol: 1-10 parts, surfactant: 0.5-2 parts, wherein the inorganic acid includes at least one of sulfuric acid and nitric acid.The magnesium alloy passivator, without phosphorus Chrome-free, the passivating film of formation corrosion resistance with super strength.The invention also discloses the passivation technologies of above-mentioned magnesium alloy high corrosion-resistant passivator, including degreasing, activation, acid table tune, alkaline table tune, passivation, baking, the passivation technology changes traditional magnesium alloy passivation technology, can reach high corrosion resistance without closing, is especially suitable for magnesium alloy AZ31.
Description
Technical field
The present invention relates to Mg alloy surface process fields, and in particular to a kind of magnesium alloy high corrosion-resistant passivator and its blunt
Chemical industry skill.
Background technique
Magnesium is most light one of structural metallic material, but have specific strength and specific stiffness are high, damping and amortization and machinability are good,
The advantages that being easily recycled.Magnesium alloy is applied to automobile industry both at home and abroad, with loss of weight, energy conservation, pollution is reduced, improves environment.Hair
3L target will be finally realized up to hundred kilometers of oil consumptions of national automobile, and European car accounts for the 14% of magnesium total flow with magnesium, it is contemplated that from now on
Will be with 15~20% speed increase: now by country to new energy, new material be supported energetically, and Mg alloy surface processing also obtains
To development energetically, magnesium alloy differential arc oxidation, magnesium alloy plating, magnesium alloy oil spout, magnesium alloy spraying, magnesium alloy passivation, magnesium conjunction
The techniques such as golden epithelium gradually mature processing cost and are also constantly declining, and new-energy automobile, aircraft, aerospace, is defended high-speed rail
Star, 3C Product, building decoration materials, battery etc. are all expanding magnesium alloy usage amount.
Mg alloy surface processing is mainly chemical conversion treatment, also known as Passivation Treatment, by Passivation Treatment in magnesium alloy table
Layer protecting film is formed, now to improve the corrosion resistance of magnesium alloy.Traditional magnesium alloy Passivation Treatment is phosphatization, and this technique is held
It easily causes the phosphorus of plant chimney stalk exceeded, so that be easy to causeing water eutrophication after waste water discharge, endangers aqueous bio, endanger
Environment.The requirement of environmental protection production is not met；The Passivation Treatment of more early stage even contains Cr VI, and Cr VI belongs to carcinogenic weight
There is the health of operator and greatly threaten in metal.Therefore the development of magnesium alloy Passivation Treatment both domestic and external now
Trend is chromium-phosphorus-free Passivation Treatment, and relevant research will increasingly be paid attention to.Existing magnesium alloy Passivation Treatment obtains
Magnesium alloy protective film, corrosion resistance is not able to satisfy the demand of people.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of magnesium alloy high corrosion-resistant passivator and its passivation work
Skill improves the corrosion resistance of magnesium alloy.
The technical problems to be solved by the invention also reside in, and provide a kind of magnesium alloy high corrosion-resistant passivator and its passivation
Technique, not phosphorous chromium meet the ecological requirements of liquid medicine discharge, environmentally friendly.
In order to solve the above technical problem, the present invention provides a kind of magnesium alloy high corrosion-resistant passivator, it is characterised in that:
The passivator includes following component according to mass parts:
Inorganic acid: 1-15 parts；
Complexing agent: 1-20 parts；
Rare earth metal salt: 1-10 parts；
Alkali salt: 1-10 parts；
Organic Alcohol: 1-10 parts；
Surfactant: 0.5-2 parts；
Wherein the inorganic acid includes at least one of sulfuric acid or nitric acid.
Preferably, the complexing agent includes EDTA, EDETATE SODIUM, grape sodium carbonate, sodium citrate and calgon
At least one of.
Preferably, the rare earth metal salt is potassium fluotitanate, titanium sodium fluoride, potassium fluorozirconate, sodium fluozirconate, sulfuric acid oxygen
At least one of titanium, potassium metavanadate and sodium metavanadate.
Preferably, the alkali salt be magnesium sulfate, magnesium chloride, calcium chloride, calcium nitrate and calcirm-fluoride at least
It is a kind of.
Preferably, the Organic Alcohol be methanol, ethyl alcohol, propyl alcohol, mannitol, ethylene glycol and polyethylene glycol at least
It is a kind of.
Preferably, the surfactant is lauryl sodium sulfate, neopelex, di-2-ethylhexylphosphine oxide naphthalene
At least one of sodium sulfonate and sodium lignin sulfonate.
The invention also discloses the passivation technologies of above-mentioned magnesium alloy high corrosion-resistant passivator, it is characterised in that: including with
Lower step:
S1, ungrease treatment: by magnesium alloy be put into containing concentration be 50g/L degreasing agent solution in, control temperature 50 DEG C-
Between 80 DEG C, the processing time is 2-4min, removes the greasy dirt of Mg alloy surface；
S2, activation processing: by the magnesium alloy after degreasing after the cleaning of Rinsing Area at least twice, 10-15% is placed into
Activator solution in, room temperature handles 1-3min, and homogeneous corrosion Mg alloy surface makes its surface that homogeneous black be presented completely；
S3, acid table tune: the magnesium alloy after activation processing after ultrasonic wave clear water is washed at least twice, then is placed in
In the solution that 20-30% acidity table is adjusted, room temperature handles the time: 3-5min, uniformly removes Mg alloy surface grey black, and whole
It puts down, draw white Mg alloy surface；
S4, alkaline table tune: it by the magnesium alloy after acid table tune after the cleaning of Rinsing Area at least twice, then is placed in
In the solution that the alkaline table of 10-15% is adjusted, room temperature handles the time: 1-3min, removes the black film that acid table tune difficulty is removed；In
With the residual acid solution of acid table tune, Mg alloy surface is further flattened；
S5, Passivation Treatment: the magnesium alloy of reason will be mediated through parlkaline table, be sent into after quick warm water, cold rinse
Containing processing is passivated in the passivator that concentration is 10-15%, 1-5min is impregnated；Mg alloy surface forms one layer
The passivating film that nanoscale is uniform, height is anti-corrosion；
S6, baking are dried: by after the cold pure water rinsing used for magnesium alloy of Passivation Treatment, being transferred to temperature rapidly is
The ventilated oven of 100 degree of -160 degree, dry 10-15min.
Implement the embodiment of the present invention, has the following beneficial effects:
A kind of disclosed magnesium alloy high corrosion-resistant passivator and its passivation technology of the present invention, with existing magnesium alloy
Passivation technology is compared, the passivation technology, using alkali salt and rare earth metal salt in acid condition in Mg alloy surface shape
Protective film is reticulated, prevents interference to be passivated by metal ions other in complexing agent complex solution, Organic Alcohol is added and penetrates into net
The adhesive force of gap the enhancing protective film and magnesium alloy substrates of shape protective film, and traditional Passivation Treatment process is changed, it uses
Acid table tune scheme, processed magnesium alloy passivating film film forming is smooth, Bai Liang, uniformly, has high corrosion resistance, is tradition
It closes magnesium alloy and handles impossible high corrosion-resistant, can reach high corrosion resistance without closing, be especially suitable for magnesium and close
Golden AZ91D, and phosphorus and chromium are not contained, it is pollution-free to water body, to operator without health threat, meets environment-friendly and green production and want
It asks.
Specific embodiment
The invention discloses the present invention to provide a kind of magnesium alloy high corrosion-resistant passivator, and the passivator is according to mass parts
Including following component: inorganic acid: 1-15 parts；Complexing agent: 1-20 parts；Rare earth metal salt: 1-10 parts；Alkali salt: 1-
10 parts；Organic Alcohol: 1-10 parts；Surfactant: 0.5-2 parts；Wherein the inorganic acid include in sulfuric acid or nitric acid at least
It is a kind of.
Specifically, the complexing agent includes EDTA, EDETATE SODIUM, grape sodium carbonate, sodium citrate and calgon
At least one of.
Specifically, the rare earth metal salt is potassium fluotitanate, titanium sodium fluoride, potassium fluorozirconate, sodium fluozirconate, sulfuric acid oxygen
At least one of titanium, potassium metavanadate and sodium metavanadate.
Specifically, the alkali salt be magnesium sulfate, magnesium chloride, calcium chloride, calcium nitrate and calcirm-fluoride at least
It is a kind of.
Specifically, the Organic Alcohol be methanol, ethyl alcohol, propyl alcohol, mannitol, ethylene glycol and polyethylene glycol at least
It is a kind of.
Specifically, the surfactant is lauryl sodium sulfate, neopelex, di-2-ethylhexylphosphine oxide naphthalene
At least one of sodium sulfonate and sodium lignin sulfonate.
The mechanism of action of disclosed magnesium alloy high corrosion-resistant passivator of the present invention: utilizing organic and inorganic composition,
One layer of nanoscale protective film is formed in Mg alloy surface；Inorganic acid (sulfuric acid and nitric acid) can with Mg alloy surface oxidation reaction,
Keep metal free with ionic condition；EDTA, EDETATE SODIUM, grape sodium carbonate, sodium citrate and calgon belong to organic acid
Foreign metal ion, such as iron ion, aluminium ion can be complexed as complexing agent in salt, and magnesium ion etc. prevents from interfering；Magnesium sulfate, chlorine
Change magnesium, calcium chloride, calcium nitrate and calcirm-fluoride can be adsorbed on Mg alloy surface and participate in film forming, and with rare earth metal salt (such as metavanadic acid
Potassium) the webbed protective film of shape；Calcium salt can participate in forming a film, and enhance the wear resistance of protective film；Organic Alcohol (methanol, ethyl alcohol, propyl alcohol,
Mannitol, ethylene glycol and polyethylene glycol) there is extremely strong osmosis, can allow at protective film gap and form a film, enhancing protective film with
The adhesive force of substrate；Surfactant (lauryl sodium sulfate, neopelex, sodium methylene bis-naphthalene sulfonate and wood
Quality sodium sulfonate), it can control reaction rate, and film forming is more uniform, meanwhile, it is more clean to be discharged later washing, prevents
Pollutant destroys protective film.It is and existing the invention discloses a kind of magnesium alloy high corrosion-resistant passivator and its passivation technology
Magnesium alloy passivation technology compare, which is closed in magnesium in acid condition using alkali salt and rare earth metal salt
Gold surface forms reticular protection film, prevents interference to be passivated by metal ions other in complexing agent complex solution, is added organic
Alcohol penetrates into the adhesive force of gap the enhancing protective film and magnesium alloy substrates of reticular protection film, and changes traditional Passivation Treatment
Process, using acid table tune scheme, processed magnesium alloy passivating film film forming is smooth, Bai Liang, uniformly, with high anti-corrosion
Property, it is that tradition closing magnesium alloy handles impossible high corrosion-resistant, can reach high corrosion resistance without closing, especially
It is suitble to magnesium alloy AZ31, and does not contain phosphorus and chromium, it is pollution-free to water body, to operator without health threat, it is green to meet environmental protection
Color production requirement.
The invention also discloses the passivation technologies of above-mentioned magnesium alloy high corrosion-resistant passivator, comprising the following steps:
S1, ungrease treatment: by magnesium alloy be put into containing concentration be 50g/L degreasing agent solution in, control temperature 50 DEG C-
Between 80 DEG C, the processing time is 2-4min, removes the greasy dirt of Mg alloy surface；
S2, activation processing: by the magnesium alloy after degreasing after the cleaning of Rinsing Area at least twice, 10-15% is placed into
Activator solution in, room temperature handles 1-3min, and homogeneous corrosion Mg alloy surface makes its surface that homogeneous black be presented completely；
S3, acid table tune: the magnesium alloy after activation processing after ultrasonic wave clear water is washed at least twice, then is placed in
In the solution that 20-30% acidity table is adjusted, room temperature handles the time: 3-5min, uniformly removes Mg alloy surface grey black, and whole
It puts down, draw white Mg alloy surface；
S4, alkaline table tune: it by the magnesium alloy after acid table tune after the cleaning of Rinsing Area at least twice, then is placed in
In the solution that the alkaline table of 10-15% is adjusted, room temperature handles the time: 1-3min, removes the black film that acid table tune difficulty is removed；In
With the residual acid solution of acid table tune, Mg alloy surface is further flattened；
S5, Passivation Treatment: the magnesium alloy of reason will be mediated through parlkaline table, be sent into after quick warm water, cold rinse
Containing processing is passivated in the passivator that concentration is 10-15%, 1-5min is impregnated；Mg alloy surface forms one layer
The passivating film that nanoscale is uniform, height is anti-corrosion；
S6, baking are dried: by after the cold pure water rinsing used for magnesium alloy of Passivation Treatment, being transferred to temperature rapidly is
The ventilated oven of 100 degree of -160 degree, dry 10-15min allow passivating film to dry the water evaporation of the film layer of magnesium alloy
Layer combines more preferably.
Specifically, before step S2 ungrease treatment, magnesium alloy can be carried out at the processing such as mechanical grinding, wire drawing, sandblasting
Reason；In step s3, Mg alloy surface is adjusted to uniform mute white state by acid table tune, and front and back washing can only be with cold
Water rinses rapidly；In step s 4, the temperature of alkaline table tune is higher than 50 degree；In step s 5, in order to ensure Mg alloy surface
Uniformly, workpiece will swing in passivator solution (i.e. tank liquor) or inflate in tank liquor to stir tank liquor for passivation.
Combined with specific embodiments below, the invention will be further described, understands that the present invention wants in order to clearer
Seek the technical idea of protection.
Embodiment 1
Present embodiment discloses a kind of magnesium alloy high corrosion-resistant passivator, include following component according to mass parts:
Sulfuric acid: 1 part
Sodium citrate: 20 parts
Sodium fluozirconate: 3 parts
Sodium metavanadate: 2 parts
Calcium carbonate: 10 parts
Ethyl alcohol: 5 parts
Benzene sulfonic acid sodium salt: 0.5 part.
Embodiment 2
Present embodiment discloses a kind of magnesium alloy high corrosion-resistant passivator, include following component according to mass parts:
Nitric acid: 10 parts
Sodium gluconate: 10 parts
Fluorine zirconic acid: 5 parts
Potassium metavanadate: 2 parts
Calcium nitrate: 10 parts
Polyethylene glycol: 5 parts
Lauryl sodium sulfate: 0.5 part.
Embodiment 3
Present embodiment discloses a kind of magnesium alloy high corrosion-resistant passivator, include following component according to mass parts:
Sulfuric acid: 5 parts
Nitric acid: 5 parts
Calgon: 10
Fluotitanic acid: 1 part
Sodium metavanadate: 5 parts
Calcium dihydrogen phosphate: 10 parts
Ethylene glycol: 5 parts
Sodium methylene bis-naphthalene sulfonate: 0.2 part.
Embodiment 4
Present embodiment discloses a kind of magnesium alloy high corrosion-resistant passivator, include following component according to mass parts:
EDTA:10 parts
Fluorine zirconic acid: 10 parts
Potassium metavanadate: 3 parts
Calcium nitrate: 10 parts
Polyethylene glycol: 1 part
Sodium lignin sulfonate: 1 part.
Embodiment 5
Present embodiment discloses a kind of magnesium alloy high corrosion-resistant passivator, include following component according to mass parts:
Nitric acid: 10 parts
Sodium gluconate: 5 parts
Sodium metavanadate: 1 part
Calcium chloride: 1 part
Ethylene glycol: 10 parts
Neopelex: 1 part.
Comparative example 1
Include following component according to mass parts:
Phosphoric acid: 50 parts
Sodium dihydrogen phosphate: 30 parts
Zinc nitrate: 10 parts
Sodium metavanadate: 2 parts
Surfactant: 2 parts.
Comparative example 2
Include following component according to mass parts:
Phosphoric acid: 50 parts
Sodium dihydrogen phosphate: 80 parts
Manganese phosphate: 10 parts
Sodium metavanadate: 5 parts.
Comparative example 3
Include following component according to mass parts:
Phosphoric acid: 40 parts
Sodium dihydrogen phosphate: 100 parts
Calcium dihydrogen phosphate: 50 parts
Potassium metavanadate: 1 part.
Comparative example 4
Include following component according to mass parts:
Sodium dihydrogen phosphate: 100 parts
Calcium nitrate: 50 parts
Sodium metavanadate: 2 parts
Neopelex: 1 part.
Comparative example 5
Include following component according to mass parts:
Phosphoric acid: 80 parts
Sodium dihydrogen phosphate: 80 parts
Calcium phosphate: 100 parts.
Salt spray test:
Take passivator made of the various embodiments described above and comparative example to magnesium alloy (trade mark AZ91D) by the present invention respectively
The passivation technology is handled, and carries out corrosion resistance detection to the magnesium alloy being disposed, and corrosion resistance passes through neutral salt spray
To measure, the method for neutral salt spray test makees exposed neutral salt to magnesium alloy according to according to GB/T1771-2007 standard for test
Mist test, the result is as follows:
| Embodiment | Salt spray results (hour) |
| Embodiment 1 | 76 |
| Embodiment 2 | 96 |
| Embodiment 3 | 77 |
| Embodiment 4 | 68 |
| Embodiment 5 | 63 |
| Comparative example 1 | 28 |
| Comparative example 2 | 37 |
| Comparative example 3 | 35 |
| Comparative example 4 | 32 |
| Comparative example 5 | 3 |
From the point of view of upper table salt spray test result, the component and content in the bright example 1-5 of we are public in institute of the invention
In the claimed range for the magnesium alloy passivator opened, corrosion resistance of magnesium alloy after processing can be superior, can cross neutral salt spray survey
Examination 48 hours.
The uniform existing common method of magnesium alloy Passivation Treatment of comparative example 1-5, from experiment contrast result it is recognised that
Comparative example 1, the naked film of magnesium alloy are crossed neutral salt spray and are tested 28 hours, inadequate mistake 24 hours, phosphoric acid in scheme, not environmentally；Scheme
In be free of calcium salt, formed film layer belong to Zinc phosphating system, film layer is partially thin, and corrosion resistance is not strong.Comparative example 2, salt spray test
37 hours, be because of vanadic salts containing rare earth metal, the also stronger manganese salt containing corrosion stability, so corrosion resistance significantly improves very in scheme
More, still, tank liquor depends on biphosphate stable sodium PH, can only will soon generate precipitating stable to a certain degree, influences magnesium and closes
The corrosion resistance of gold.Comparative example 3, the naked film neutral salt spray of magnesium alloy are tested 35 hours, equally, contain rare earth metal inside scheme
Vanadic salts, has changed the stronger calcium salt of corrosion resistance, but tank liquor stablizes PH, is still dihydric phosphate, tank liquor stablize the time compared with
It is short.Comparative example 4, neutral salt spray 32 hours, be that also joined calcium salt because joined rare earth composition vanadium, can guarantee to a certain degree
Corrosion resisting property after being added to a small amount of surfactant, can allow workpiece surface more uniform when forming film.Comparative example 5,
Salt fog performance is very poor, and scheme belongs to early stage traditional magnesium alloy phosphating system for handling, and protective epithelium belongs to phosphate
Deposition, Lai Zengqiang corrosion stability, but structure is single each other for the phosphate deposited, binding force is poor
The above is only specific embodiments of the present invention, are not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification is applied directly or indirectly in other relevant technical fields,
Similarly it is included within the scope of the present invention.
Claims (7)
1. a kind of magnesium alloy high corrosion-resistant passivator, it is characterised in that: the passivator includes following component according to mass parts:
Inorganic acid: 1-15 parts；
Complexing agent: 1-20 parts；
Rare earth metal salt: 1-10 parts；
Alkali salt: 1-10 parts；
Organic Alcohol: 1-10 parts；
Surfactant: 0.5-2 parts；
Wherein the inorganic acid includes at least one of sulfuric acid and nitric acid.
2. a kind of magnesium alloy high corrosion-resistant passivator as described in claim 1, it is characterised in that: the complexing agent includes
At least one of EDTA, EDETATE SODIUM, grape sodium carbonate, sodium citrate and calgon.
3. a kind of magnesium alloy high corrosion-resistant passivator as described in claim 1, it is characterised in that: the rare earth metal salt is
At least one of potassium fluotitanate, titanium sodium fluoride, potassium fluorozirconate, sodium fluozirconate, titanyl sulfate, potassium metavanadate and sodium metavanadate.
4. a kind of magnesium alloy high corrosion-resistant passivator as described in claim 1, it is characterised in that: the alkali salt is
At least one of magnesium sulfate, magnesium chloride, calcium chloride, calcium nitrate and calcirm-fluoride.
5. a kind of magnesium alloy high corrosion-resistant passivator as described in claim 1, it is characterised in that: the Organic Alcohol is first
At least one of alcohol, ethyl alcohol, propyl alcohol, mannitol, ethylene glycol and polyethylene glycol.
6. a kind of magnesium alloy high corrosion-resistant passivator as described in claim 1, it is characterised in that: the surfactant is
At least one of lauryl sodium sulfate, neopelex, sodium methylene bis-naphthalene sulfonate and sodium lignin sulfonate.
7. a kind of passivation technology of application such as magnesium alloy high corrosion-resistant passivator of claim 1-6 any one, feature exist
In: the following steps are included:
S1, ungrease treatment: magnesium alloy is put into the degreasing agent solution for being 50g/L containing concentration, controls temperature at 50 DEG C -80 DEG C
Between, the processing time is 2-4min, removes the greasy dirt of Mg alloy surface；
S2, activation processing: by the magnesium alloy after degreasing after the cleaning of Rinsing Area at least twice, the activation of 10-15% is placed into
In agent solution, room temperature handles 1-3min, and homogeneous corrosion Mg alloy surface makes its surface that homogeneous black be presented completely；
S3, acid table tune: by the magnesium alloy after activation processing, after ultrasonic wave clear water is washed at least twice, then it is placed in 20-
In the solution that 30% acid table is adjusted, room temperature handles the time: 3-5min, uniformly removes Mg alloy surface grey black, and flatten, draw
White Mg alloy surface；
S4, alkaline table tune: by the magnesium alloy after acid table tune after the cleaning of Rinsing Area at least twice, then it is placed in 10-15%
The solution adjusted of alkaline table in, room temperature handles the time: 1-3min, removes the black film that acid table tune difficulty is removed；Neutralize acid table tune
Residual acid solution, further flatten Mg alloy surface；
S5, Passivation Treatment: the magnesium alloy of reason will be mediated through parlkaline table, be sent into and contain after quick warm water, cold rinse
It is passivated processing in the passivator that concentration is 10-15%, impregnates 1-5min；Mg alloy surface forms one layer of nanoscale
Uniform, high anti-corrosion passivating film；
S6, baking are dried: by after the cold pure water rinsing used for magnesium alloy of Passivation Treatment, being transferred to temperature rapidly is 100
The ventilated oven of -160 degree of degree, dry 10-15min.
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| CN109943834A (en) * | 2019-03-28 | 2019-06-28 | 江苏鑫露化工新材料有限公司 | It is a kind of for enhancing zirconium, the additive of titanium compound inactivating performance and its application |
| CN110565148A (en) * | 2019-09-27 | 2019-12-13 | 佛山市南海双成金属表面技术有限公司 | Magnesium alloy black micro-arc oxidation film nano passivator and passivation method |
| CN110684970A (en) * | 2019-09-26 | 2020-01-14 | 博罗县东明化工有限公司 | Treatment method of magnesium alloy conversion film and conversion agent |
| CN112795909A (en) * | 2020-12-17 | 2021-05-14 | 广东剑鑫科技股份有限公司 | High-salt-spray-resistant magnesium alloy coating agent and preparation method thereof |
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| CN113151878A (en) * | 2021-02-01 | 2021-07-23 | 湖北叒成科技有限公司 | ZK61M magnesium alloy black formation liquid and formation process |
| CN115522206A (en) * | 2022-09-30 | 2022-12-27 | 深圳市豪龙新材料技术有限公司 | Cavity filter surface treatment method |
| CN115522206B (en) * | 2022-09-30 | 2023-08-15 | 深圳市豪龙新材料技术有限公司 | Surface treatment method for cavity filter |
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