CN107641803A - The method of aluminum alloy die casting passivating solution, preparation method and Passivation Treatment - Google Patents
The method of aluminum alloy die casting passivating solution, preparation method and Passivation Treatment Download PDFInfo
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Abstract
The present invention provides a kind of anti-corrosion true qualities passivating solution for aluminum alloy die casting, and according to mass percent meter, the passivating solution includes：Chromic salt 1 10%, zirconates compound 1 8%, mixed accelerators 0.1 5%, the water of surfactant 0.01 0.05% and surplus, wherein, the mixed accelerators is cobalt salt, sodium fluoride and sodium nitrate mass ratio 0.5 2：0.5‑2：5 15 mixture.The method that the present invention also provides a kind of preparation method of passivating solution and anti-corrosion true qualities Passivation Treatment is carried out to aluminum alloy die casting surface.Gained film layer of the invention is true qualities, and even compact, corrosion resistance is strong, good conductivity, does not influence die casting aluminium true qualities metal-like.
Description
Technical field
The invention belongs to material surface processing and metal protection technical field, more particularly to a kind of aluminum alloy die casting is resistance to
Lose capital color passivating solution, preparation method and passivating method.
Technical background
In fields such as communication, automobile, hardware, due to outward appearance and corrosion resistance to die casting aluminium product requirement increasingly
Height, the passivation of aluminum alloy die casting true qualities, processing and surface anticorrosive process field have more and more extensive application before spraying.
Traditional sexavalence chromium passivating can form anti-corrosion fine and close passivating film, but because Cr VI belongs to carcinogen, it is various by the whole world
Environmental regulation disabled, therefore, non-Cr VI passivating technique is developed rapidly in recent years.Due to true qualities chromium-free deactivation skill
Art corrosion resistance is poor, and cost is higher, can not obtain market accreditation.Market mainstream application is trivalent chromium true qualities passivating technique.
Die casting aluminium true qualities passivator in the market is mainly trivalent chromium passivation technique.It is although more resistance to than chromium-free deactivation technology
Corrosion is good, but also has certain gap with sexavalence chromium passivating, and corrosion resistance difference is to restrict trivalent chromium true qualities to be passivated the main of sizable application
Problem.And existing trivalent chromium passivation technique is for aluminum alloy die casting true qualities passivating film, generally existing corrosion resistance difference
Problem, if improving corrosion resistance, passivating film can be caused the colorized appearance such as light blue, faint yellow occur, and this has outside at some
See does not allow on the part of finishing requirements.If carrying out colored varnish spraying, outward appearance metal-like can be changed, and sacrifice
The conduction needs on surface.
Chinese patent at present, Application No. CN201010533461.7, disclose a kind of true qualities for aluminium alloy and be passivated
Treatment fluid, disclosed passivating solution main component are chromic salt, zirconates and cerium lanthanum salt film forming agent etc..The solution is mainly used in
Roll section bar aluminium alloy, resulting passivation film outward appearance is true qualities, but membranous layer corrosion resistance is poor, and salt fog occurs as soon as corrosion within 24 hours.
For pack alloy, the problem of colouring and corrosion resistance difference still can be present.
Such as Chinese patent again, Application No. CN201510349856.4, disclose a kind of for die casting aluminium ball blast part
Chromium-free passivation liquid, die casting aluminium surface true qualities passivating film can be obtained after ball blast, solution contains ammonium fluozirconate, ammonium metavanadate, lemon
Acid, magnesium nitrate, cobaltous sulfate etc..But salt spray test may only reach 24H, corroded area is less than 10%.It is anti-corrosion still poor, can not
Meet industrial requirement.
The defects of larger, is had based on existing die casting aluminium true qualities passivator, it is necessary to research and develop a kind of aluminum alloy die casting
Anti-corrosion true qualities passivator, to solve current problems faced place.
The content of the invention
The present invention is directed to above technical problem, there is provided a kind of high anti-corrosion true qualities passivating solution for aluminum alloy die casting and its
Preparation method and true qualities deactivating process for the treatment of, present invention gained film layer is true qualities, and even compact, corrosion resistance is strong, good conductivity, no
Influence die casting aluminium true qualities metal-like.
First, the present invention provides a kind of anti-corrosion true qualities passivating solution for aluminum alloy die casting, it is characterised in that according to matter
Percentages are measured, the passivating solution includes：Chromic salt 1-10%, zirconates compound 1-8%, mixed accelerators 0.1-5%, table
Face activating agent 0.01-0.05% and surplus water, wherein, the mixed accelerators is cobalt salt, sodium fluoride and sodium nitrate mass ratio
(0.5-2)：(0.5-2)：The mixture of (5-15).
Further, the passivating solution includes：Chromic salt 3-8% (being preferably 3%, 4%, 5%, 6%, 7%, 8%),
Zirconates compound 3-6% (be preferably 3%, 4%, 5%, 6%), mixed accelerators 0.5-2% (be preferably 0.5%, 1%,
1.5%th, 2%), the water of surfactant 0.01-0.03% and surplus.
Further, the mixed accelerators is cobalt salt, sodium fluoride and sodium nitrate mass ratio (0.8-1.5)：(0.8-
1.5)：The mixture of (7-12), in most preferred embodiment, the cobalt salt, sodium fluoride and sodium nitrate mass ratio are 1：1：10.
Further, the chromic salt is anhydrous slufuric acid chromium, six hydrated sulfuric acid chromium, 12 water hydrated sulfuric acid chromium, 18
One or more in hydrated sulfuric acid chromium, anhyd chromic chloride, Hexaaquachromium chloride, acetic anhydride chromium, two hydration chromic acetates, it is optimal
In the embodiment of choosing, the chromic salt is the mixture of one or both of six hydrated sulfuric acid chromium and Hexaaquachromium chloride.
Further, the zirconates compound is potassium fluorozirconate, sodium fluozirconate, ammonium fluozirconate, anhydrous basic zirconium chloride, eight water
The one or more in basic zirconium chloride are closed, in most preferred embodiment, the zirconates compound is potassium fluorozirconate and chlorine hydrate
The mixture of one or both of zirconium oxide.
Further, the cobalt salt in the mixed accelerators is Cobalt monosulfate heptahydrate, cabaltous nitrate hexahydrate or the two is mixed
Compound, in most preferred embodiment, the mixed accelerators is cabaltous nitrate hexahydrate.
Further, the surfactant can be nonionic surface active agent, wherein, the surfactant can be with
For the one or more in polyoxyethylene-type and polyol type, the surfactant of the polyoxyethylene-type can gather for alkyl phenol
Oxygen vinethene (such as OPEO, NPE etc.), high-carbon fatty alcohol polyoxyethylene ether, aliphatic acid
Polyoxyethylene ester, fatty acid methyl ester ethoxylate, polypropylene glycol ethylene oxide adduct, it is polyoxyethylated at least one
Kind, the surfactant of the polyol type can be polyvalent alcohol (such as polyethylene glycol etc.), polyol ester, glycerine list tristearin
At least one of acid esters, polyol ester APEO etc., in most preferred embodiment, the surfactant is poly- second two
Alcohol.
Secondly, the present invention provides a kind of preparation method of anti-corrosion true qualities passivating solution for aluminum alloy die casting, the side
Method comprises the following steps：
Following raw material is prepared, the raw material includes according to mass percent meter：Chromic salt 1-10%, zirconates compound 1-
8%th, mixed accelerators 0.1-5%, surfactant 0.01-0.05% and surplus water, wherein, the mixed accelerators is cobalt
Salt, sodium fluoride and sodium nitrate mass ratio (0.5-2)：(0.5-2)：The mixture of (5-15)；
Get 80% pure water of amount of calculation ready first, then zirconates compound and mixed accelerators are added in pure water and stirred
Mix, again add chromic salt after dissolving, continue stirring and dissolving, then surfactant is added and is stirring evenly and then adding into residue
20% pure water, obtains finished product.
Finally, the present invention also provides a kind of method to aluminum alloy die casting surface corrosion resistance true qualities Passivation Treatment, the side
Method comprises the following steps：
S1：Bright cleaning is carried out to aluminum alloy die casting, aluminum alloy die casting can be fresh aluminium alloy blank, can also
The aluminum alloy die casting of oxidation is had occurred and that for the part surface through over mechanical processing；
S2：By the described anti-corrosion true qualities passivating solution for aluminum alloy die casting with pure water dilute 10-20 times, adjust pH to
Working solution is made in 3.7-4.0；
S3：The aluminum alloy die casting that light cleans up is immersed in into table to adjust in liquid, carry out table mediates reason at normal temperatures, when
Between the 20-60 seconds；
S4：The workpiece cleaned up after table is adjusted is immersed in the passivation working solution prepared, blunt under the conditions of 30-40 DEG C
Change minute time 2-5, wherein can be at 32 DEG C either 35 DEG C or 38 DEG C；Under be passivated；
S5：Workpiece pure water cleans after passivation, dries.
Further, the step S1 can also specifically include：
S11：Aluminum alloy die casting is immersed into bright degreasing agent degreasing, aluminum alloy die casting can have occurred and that oxidation
Die casting, degreasing activation 5-10 minutes at 50-60 DEG C of temperature, or degreasing activation is 3-5 minutes under Ultrasonic Conditions, wherein,
The special degreasing agent solution is non-phosphate high-effect degreasing agent, has degreasing, activation, glossy surface effect, wherein, described is without phosphorus
Efficient degreasing agent can be the mixture of not phosphorous builder, bleeding agent and nonionic surfactant, the not phosphorous builder
The one or more in sodium citrate, sodium gluconate etc. can be included；
S12：Aluminum alloy die casting is cleaned up with water.
Further, the step S2 can specifically include：
S31：After being cleaned up with the workpiece after bright degreasing agent degreasing, carry out table mediates reason in immersion table adjustment solution
The 20-60 seconds, it can be inorganic acid and organic acid mixture that the table, which is adjusted,；
S32：Workpiece carries out pure water cleaning after table is mediated into reason, removes clean table and adjusts liquid residual, obtains fresh uniform table
Face.
Further, the step S5 can specifically include：
S51：The passivating solution of aluminum alloy surface is cleaned with clear water；
S52：At least 0.5-1 minutes are soaked in 70-80 DEG C of hot water；
S53：Aluminum alloy die casting after immersion is dried up or with oven for drying, drying temperature 100- with compressed air in time
120 DEG C, minute time 10-30.
A kind of anti-corrosion true qualities passivating solution for aluminum alloy die casting provided by the invention, according to mass percent meter, institute
Stating passivating solution includes：Chromic salt 1-10%, zirconates compound 1-8%, mixed accelerators 0.1-5%, surfactant 0.01-
0.05% and the water of surplus, wherein, the mixed accelerators is cobalt salt, sodium fluoride and sodium nitrate mass ratio (0.5-2)：(0.5-
2)：The mixture of (5-15).The each component of the present invention can act synergistically, and can enable aluminum alloy to die casting surface passivation, during passivation
Between it is short, only need 2-5min, the passivation film of formation is true qualities, and even compact, corrosion resistance is strong, can reach salt spray test 48H not
Corrode, and film layer good conductivity, it is easy to use.True qualities deactivating process for the treatment of provided by the invention, it can not only handle new
Fresh aluminum alloy die casting, oxidized aluminum alloy die casting can also be handled, greatly improve non-fresh aluminium alloy blank
Quality is passivated, the workpiece surface colour after passivation is die casting aluminium true qualities, film layer dense uniform, and salt spray test can meet 48H.
Embodiment
The present invention is introduced in detail below, it will be appreciated that the following embodiment for simply introducing the present invention,
And restriction protection scope of the present invention is not lain in.
Embodiment 1：
A kind of anti-corrosion true qualities passivating solution for aluminum alloy die casting that the present embodiment provides, according to mass percent meter,
Chromic salt, can be anhydrous slufuric acid chromium, six hydrated sulfuric acid chromium, 12 water hydrated sulfuric acid chromium, 18 water conjunction sulphur including following components
One or more in sour chromium, anhyd chromic chloride, Hexaaquachromium chloride, acetic anhydride chromium, two hydration chromic acetates, such as Cr2
(SO4)3·6H2O is 5%, zirconates compound, can be potassium fluorozirconate, sodium fluozirconate, ammonium fluozirconate, anhydrous basic zirconium chloride, eight water
Close the one or more in basic zirconium chloride, such as K2ZrF6For 3%, mixed accelerators 0.5%, polyethylene glycol 0.01% is remaining
Measure as water, wherein, the mixed accelerators is cabaltous nitrate hexahydrate, sodium fluoride and sodium nitrate mass ratio 1：1：10 mixture.
The preparation process method for the anti-corrosion true qualities passivating solution for aluminum alloy die casting that the present embodiment is provided, in normal temperature
Under normal pressure, by Cr2(SO4)3·6H2O is dissolved in suitable quantity of water, adds K while stirring2ZrF6And mixed accelerators, continuing stirring makes
It is completely dissolved；Then polyethylene glycol is added, is stirred；Remaining water is finally added, is produced.
To the method for aluminum alloy die casting surface corrosion resistance true qualities Passivation Treatment, including：
S101：Aluminum alloy die casting (including aluminum alloy die casting of partial oxidation) can be used non-phosphate high-effect degreasing
Agent carries out degreasing, degreasing 5-10 minutes at 50-60 DEG C of temperature, or the degreasing 3-5 minutes under Ultrasonic Conditions, wherein, it is described
Non-phosphate high-effect degreasing agent can be not phosphorous builder, bleeding agent and nonionic surfactant mixture, it is described not phosphorous
Builder can include the one or more in sodium citrate, sodium gluconate etc.；
S102：Unnecessary degreasing agent is washed with water；
S103：Aluminum alloy die casting is immersed into table and adjusts solution, the 20-60 seconds is activated under normal temperature, workpiece is washed rapidly totally,
Wherein, the table adjusts solution to whiten agent for die casting aluminium is special, such as can be special inorganic acid and organic acid mixture；
S104：Aluminum alloy die casting is cleaned up with water, clean table is removed and adjusts liquid residual, obtain fresh uniform table
Face；
S105：The high anti-corrosion passivating solution for being used for aluminum alloy die casting that the present embodiment is provided dilutes 10 times, is configured to
10% working solution, 35 DEG C can be first heated up to, then pH value is adjusted to 3.8 with 1% sulfuric acid or sodium hydroxide, or can first used
1% sulfuric acid or sodium hydroxide adjusts pH value to 3.8, then is heated up to 35 DEG C, and this is not restricted, the aluminium alloy that will be cleaned up
Die casting is immersed in this working solution, passivation time 2.5 minutes at 35 DEG C；
S106：The passivating solution of aluminum alloy surface is cleaned with clear water, cleaning is twice；
S107：Soaked 1 minute in 70-80 DEG C of hot water；
S108：Aluminum alloy die casting after immersion is dried up or with oven for drying, drying temperature with compressed air in time
100-120 DEG C, minute time 10-30.
Neutral salt spray test is carried out after sample after the completion of step S108 is placed 24 hours, method of testing presses GB/
T10125-2012《Artificial atmosphere corrosion test salt spray test》, and it is passivated the test of film layer electric conductivity：It is low with TH2512B
Resistance meter carries out the resistance value at test part both ends, obtains test result, each test result can see below in table 1,
Wherein, table 1 is neutral salt spray test and passivation film electric conductivity test result.
Embodiment 2：
A kind of anti-corrosion true qualities passivating solution for aluminum alloy die casting that the present embodiment provides, including following components (press matter
Measure percentage)：Chromic salt, can be anhydrous slufuric acid chromium, six hydrated sulfuric acid chromium, 12 water hydrated sulfuric acid chromium, 18 water conjunction sulfuric acid
One or more in chromium, anhyd chromic chloride, Hexaaquachromium chloride, acetic anhydride chromium, two hydration chromic acetates, such as can be Cr2
(SO4)3·6H2O is 7%, zirconates compound, can be potassium fluorozirconate, sodium fluozirconate, ammonium fluozirconate, anhydrous basic zirconium chloride, eight water
Close the one or more in basic zirconium chloride, such as K2ZrF6For 5%, additive package 1.5%, polyethylene glycol 0.03% is remaining
Measure as water.Wherein, the mixed accelerators is cabaltous nitrate hexahydrate, sodium fluoride and sodium nitrate mass ratio 1：1：10 mixture.
The preparation process method for the anti-corrosion true qualities passivating solution for aluminum alloy die casting that the present embodiment is provided, normal temperature are normal
Pressure, by Cr2(SO4)3·6H2O is dissolved in suitable quantity of water, adds K while stirring2ZrF6And mixed accelerators, continuing stirring makes it
It is completely dissolved；Then polyethylene glycol is added, is stirred；Remaining water is finally added, is produced.
The above-mentioned solution prepared is configured to 10% working solution, is heated up to 35 DEG C, is adjusted with 1% sulfuric acid or sodium hydroxide
PH value, according to the passivation technology of embodiment 1, processing, passivation time 2.5 minutes is passivated to aluminum alloy die casting to 3.8.
Same as Example 1, neutral salt spray test is carried out after sample is placed 24 hours and passivation film electric conductivity is surveyed
Examination, obtains test result, each test result can see below in table 1.
Embodiment 3：
A kind of anti-corrosion true qualities passivating solution for aluminum alloy die casting that the present embodiment provides, including following components (press matter
Measure percentage)：Cr2(SO4)3·6H2O is 5%, K2ZrF6For 3%, additive package 1.0%, polyethylene glycol 0.02%,
Surplus is water.Wherein, the mixed accelerators is cabaltous nitrate hexahydrate, sodium fluoride and sodium nitrate mass ratio 1：1：10 mixing
Thing.
The preparation process method for the anti-corrosion true qualities passivating solution for aluminum alloy die casting that the present embodiment is provided, normal temperature are normal
Pressure, by Cr2(SO4)3·6H2O is dissolved in suitable quantity of water, adds K while stirring2ZrF6And mixed accelerators, continuing stirring makes it
It is completely dissolved；Then polyethylene glycol is added, is stirred；Remaining water is finally added, is produced.
The above-mentioned solution prepared is configured to 10% working solution, is heated up to 35 DEG C, is adjusted with 1% sulfuric acid or sodium hydroxide
PH value, according to the passivation technology of embodiment 1, processing, passivation time 2.5 minutes is passivated to aluminum alloy die casting to 3.8.
Same as Example 1, neutral salt spray test is carried out after sample is placed 24 hours and passivation film electric conductivity is surveyed
Examination, obtains test result, each test result can see below in table 1.
Embodiment 4：
A kind of anti-corrosion true qualities passivating solution for aluminum alloy die casting that the present embodiment provides, including following components (press matter
Measure percentage)：Cr2(SO4)3·6H2O is 3%, CrCl3·6H2O is 2%, K2ZrF6For 5%, additive package 1.5%, gather
Ethylene glycol is 0.02%, and surplus is water.Wherein, the mixed accelerators is cabaltous nitrate hexahydrate, sodium fluoride and sodium nitrate quality
Than 1：1：10 mixture.
The preparation process method for the anti-corrosion true qualities passivating solution for aluminum alloy die casting that the present embodiment is provided, normal temperature are normal
Pressure, by Cr2(SO4)3·6H2O and CrCl3·6H2O is dissolved in suitable quantity of water, adds K while stirring2ZrF6And mixed accelerators,
Continuing stirring is completely dissolved it；Then polyethylene glycol is added, is stirred；Remaining water is finally added, is produced.
The above-mentioned solution prepared is configured to 10% working solution, is heated up to 35 DEG C, is adjusted with 1% sulfuric acid or sodium hydroxide
PH value, according to the passivation technology of embodiment 1, processing, passivation time 2.5 minutes is passivated to aluminum alloy die casting to 3.8.
Same as Example 1, neutral salt spray test is carried out after sample is placed 24 hours and passivation film electric conductivity is surveyed
Examination, obtains test result, each test result can see below in table 1.
Embodiment 5：
A kind of anti-corrosion true qualities passivating solution for aluminum alloy die casting that the present embodiment provides, including following components (press matter
Measure percentage)：Cr2(SO4)3·6H2O is 4%, CrCl3·6H2O is 3%, K2ZrF6For 3%, additive package 2%, poly- second
Glycol is 0.02%, and surplus is water.Wherein, the mixed accelerators is cabaltous nitrate hexahydrate, sodium fluoride and sodium nitrate mass ratio
1：1：10 mixture.
The preparation process method for the anti-corrosion true qualities passivating solution for aluminum alloy die casting that the present embodiment is provided, normal temperature are normal
Pressure, by Cr2(SO4)3·6H2O and CrCl3·6H2O is dissolved in suitable quantity of water, adds K while stirring2ZrF6And mixed accelerators,
Continuing stirring is completely dissolved it；Then polyethylene glycol is added, is stirred；Remaining water is finally added, is produced.
The above-mentioned solution prepared is configured to 10% working solution, is heated up to 35 DEG C, is adjusted with 1% sulfuric acid or sodium hydroxide
PH value, according to the passivation technology of embodiment 1, processing, passivation time 2.5 minutes is passivated to aluminum alloy die casting to 3.8.
Same as Example 1, neutral salt spray test is carried out after sample is placed 24 hours and passivation film electric conductivity is surveyed
Examination, obtains test result, each test result can see below in table 1.
Embodiment 6：
The present embodiment and the difference of embodiment 1 be, the present embodiment provides a kind of for aluminum alloy die casting
Anti-corrosion true qualities passivating solution, wherein, the mixed accelerators is Cobalt monosulfate heptahydrate, sodium fluoride and sodium nitrate mass ratio 1：1：10
Mixture.
The preparation method and deactivating process for the treatment of of passivating solution can refer to embodiment 1, same as Example 1, in sample
Product carry out neutral salt spray test and the test of passivation film electric conductivity after placing 24 hours, obtain test result, each test result can
Table 1 in seeing below.
Embodiment 7：
The present embodiment and the difference of embodiment 1 be, the present embodiment provides a kind of for aluminum alloy die casting
Anti-corrosion true qualities passivating solution, wherein, the mixed accelerators is Cobalt monosulfate heptahydrate, sodium fluoride and sodium nitrate mass ratio 1：1：5
Mixture.
The preparation method and deactivating process for the treatment of of passivating solution can refer to embodiment 1, same as Example 1, in sample
Product carry out neutral salt spray test and the test of passivation film electric conductivity after placing 24 hours, obtain test result, each test result can
Table 1 in seeing below.
Embodiment 8：
The present embodiment and the difference of embodiment 1 be, the present embodiment provides a kind of for aluminum alloy die casting
Anti-corrosion true qualities passivating solution, wherein, the mixed accelerators be equivalent (six nitric hydrate ceriums and Cobalt monosulfate heptahydrate), sodium fluoride and
Sodium nitrate mass ratio 1：1：10 mixture.
The preparation method and deactivating process for the treatment of of passivating solution can refer to embodiment 1, same as Example 1, in sample
Product carry out neutral salt spray test and the test of passivation film electric conductivity after placing 24 hours, obtain test result, each test result can
Table 1 in seeing below.
Embodiment 9：
The present embodiment and the difference of embodiment 1 be, the present embodiment provides a kind of for aluminum alloy die casting
Anti-corrosion true qualities passivating solution, wherein, the mixed accelerators be equivalent (six nitric hydrate ceriums and Cobalt monosulfate heptahydrate), sodium fluoride and
Sodium nitrate mass ratio 1：1：5 mixture.
The preparation method and deactivating process for the treatment of of passivating solution can refer to embodiment 1, same as Example 1, in sample
Product carry out neutral salt spray test and the test of passivation film electric conductivity after placing 24 hours, obtain test result, each test result can
Table 1 in seeing below.
Comparative example 1：
Prepare the trivalent chromium deactivating liquid of contrast, including following components：CrCl3·6H2O and Cr2(SO4)3·6H2Each 2g of O,
ZrOCl2·8H2O and K2ZrF6Each 0.5g, KAl (SO4)212H2O is 0.5g, CeNO3For 1g.Under normal temperature and pressure, by trivalent chromium
Salt is dissolved in suitable quantity of water, adds zirconates and KAl (SO while stirring4)212H2O, continuing stirring is completely dissolved it；Then plus
Enter CeNO3Stir；Finally mend and add water to 1L.
When being passivated, above-mentioned solution is configured to 10L working solutions, is heated up to 35 DEG C, with 1% sulfuric acid or hydroxide
Sodium adjusts pH value to 3.5, and by the passivation technology of embodiment 1, progress true qualities are blunt after degreasing and table tune are carried out to aluminum alloy die casting
Change 2.5 minutes.
Sample after being passivated, neutral salt spray test and the test of passivation film electric conductivity, inspection are carried out after placing 24 hours
It is as shown in table 1 to survey result.
The neutral salt spray of table 1 is tested and passivation film electric conductivity test result
It can be learnt by the salt spray test result and resistance test result of table 1, each embodiment passivating solution provided by the invention
All pass through 48H salt spray tests, and all without the obvious corrosion of appearance, and then there is heavy corrosion in comparative example, and therefore, this hair
The passivating solution of bright offer, salt fog performance can greatly improved.
Embodiments of the invention simply introduce its embodiment, do not lie in and limit its protection domain.The skill of the industry
Art personnel can make some modifications under the inspiration of the present embodiment, therefore all equivalence changes done according to the scope of the claims of the present invention
Or modification, belong in scope of the patent claims of the present invention.
Claims (10)
1. a kind of anti-corrosion true qualities passivating solution for aluminum alloy die casting, it is characterised in that described blunt according to mass percent meter
Changing liquid includes：Chromic salt 1-10%, zirconates compound 1-8%, mixed accelerators 0.1-5%, surfactant 0.01-0.05% and
The water of surplus, wherein, the mixed accelerators is cobalt salt, sodium fluoride and sodium nitrate mass ratio 0.5-2：0.5-2：5-15 mixing
Thing.
2. the anti-corrosion true qualities passivating solution according to claim 1 for aluminum alloy die casting, it is characterised in that the passivation
Liquid includes：Chromic salt 3-8%, zirconates compound 3-6%, mixed accelerators 0.5-2%, surfactant 0.01-0.03% and remaining
The water of amount.
3. the anti-corrosion true qualities passivating solution according to claim 1 for aluminum alloy die casting, it is characterised in that the mixing
Accelerator is cobalt salt, sodium fluoride and sodium nitrate mass ratio 0.8-1.5：0.8-1.5：7-12 mixture.
4. the anti-corrosion true qualities passivating solution according to claim 1 for aluminum alloy die casting, it is characterised in that the trivalent
Chromic salts is anhydrous slufuric acid chromium, six hydrated sulfuric acid chromium, 12 water hydrated sulfuric acid chromium, 18 water conjunction chromium sulfate, anhyd chromic chloride, six water
Close the one or more in chromium chloride, acetic anhydride chromium, two hydration chromic acetates.
5. the anti-corrosion true qualities passivating solution according to claim 1 for aluminum alloy die casting, it is characterised in that the zirconates
Compound is the one or more in potassium fluorozirconate, sodium fluozirconate, ammonium fluozirconate, anhydrous basic zirconium chloride, chlorine hydrate zirconium oxide.
6. the anti-corrosion true qualities passivating solution according to claim 1 for aluminum alloy die casting, it is characterised in that：The mixing
Cobalt salt in accelerator is Cobalt monosulfate heptahydrate, cabaltous nitrate hexahydrate or the mixture of the two.
7. the preparation method of a kind of anti-corrosion true qualities passivating solution for aluminum alloy die casting, it is characterised in that methods described includes
Following steps：
Following raw material is prepared, the raw material includes according to mass percent meter：Chromic salt 1-10%, zirconates compound 1-8%, mix
The water of accelerator 0.1-5%, surfactant 0.01-0.05% and surplus is closed, wherein, the mixed accelerators is cobalt salt, fluorination
Sodium and sodium nitrate mass ratio 0.5-2：0.5-2：5-15 mixture；
Get 80% pure water of amount of calculation ready first, then zirconates compound and mixed accelerators are added in pure water and are stirred, it is molten
Xie Houzai adds chromic salt, continues stirring and dissolving, then surfactant is added and is stirring evenly and then adding into the pure of residue 20%
Water, obtain finished product.
A kind of 8. method to aluminum alloy die casting surface corrosion resistance true qualities Passivation Treatment, it is characterised in that methods described include with
Lower step：
S1：Bright cleaning is carried out to aluminum alloy die casting；
S2：The anti-corrosion true qualities passivating solution pure water for aluminum alloy die casting described in any one in claim 1-6 is dilute
10-20 times is released, working solution is made in regulation pH to 3.7-4.0；
S3：The aluminum alloy die casting that light cleans up is immersed in into special table to adjust in liquid, carry out table mediates reason at normal temperatures, when
Between the 20-60 seconds；
S4：The workpiece cleaned up after table is adjusted is immersed in the passivation working solution prepared, when being passivated under the conditions of 30-40 DEG C
Between 2-5 minutes；
S5：Workpiece pure water cleans after passivation, dries.
9. the method according to claim 8 to aluminum alloy die casting surface corrosion resistance true qualities Passivation Treatment, it is characterised in that
The step S1 is specifically included：
S11：By aluminum alloy die casting with bright degreasing agent degreasing, degreasing 5-10 minutes at 50-60 DEG C of temperature, or surpass under normal temperature
Sound wave degreasing 3-5 minutes；
S12：Unnecessary degreasing agent is washed with water.
10. the method according to claim 8 to aluminum alloy die casting surface corrosion resistance true qualities Passivation Treatment, its feature exists
In the step S5 is specifically included：
S51：The passivating solution of aluminum alloy surface is cleaned with clear water；
S52：At least 0.5-1 minutes are soaked in 70-80 DEG C of hot water；
S53：Aluminum alloy die casting after immersion is dried up or with oven for drying, drying temperature 100-120 with compressed air in time
DEG C, minute time 10-30.
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| CN109518174A (en) * | 2019-01-10 | 2019-03-26 | 廊坊师范学院 | The preparation process of coatings for aluminum materials front surface treatment fluid |
| CN110983411A (en) * | 2020-01-07 | 2020-04-10 | 昆明理工大学 | Preparation method of natural color conversion film on surface of aluminum alloy |
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| CN109518174A (en) * | 2019-01-10 | 2019-03-26 | 廊坊师范学院 | The preparation process of coatings for aluminum materials front surface treatment fluid |
| CN110983411A (en) * | 2020-01-07 | 2020-04-10 | 昆明理工大学 | Preparation method of natural color conversion film on surface of aluminum alloy |
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