CN106917082B - A kind of preparation method of chromium-free environment-friendly passivating solution - Google Patents
A kind of preparation method of chromium-free environment-friendly passivating solution Download PDFInfo
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- CN106917082B CN106917082B CN201710119672.8A CN201710119672A CN106917082B CN 106917082 B CN106917082 B CN 106917082B CN 201710119672 A CN201710119672 A CN 201710119672A CN 106917082 B CN106917082 B CN 106917082B
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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
- C23C22/48—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 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/56—Treatment of aluminium or alloys based thereon
Abstract
The present invention relates to a kind of chromium-free environment-friendly passivating solution and preparation methods, belong to field of metal surface treatment technology, the chromium-free environment-friendly passivating solution includes following component: purity is 99.99% or more rare-earth salts accounting 0.5%-5%, dispersing agent 1-3%, buffer 2-5%, preservative 1%, PH adjust liquid 1%, balance deionized water；The preparation method of the chromium-free environment-friendly passivating solution is first to purify rare-earth salts, purity is set to be reached for 99.99% or more, purity is placed in electromagnetic mixer after high-speed uniform dispersion for 99.99% or more rare-earth salts, dispersing agent, buffer, preservative, deionized water again and obtains chromium-free environment-friendly passivating solution, adds PH adjustment liquid adjustment pH value；The present invention can form the passivation layer of regular octahedron structure with aluminum alloy surface, it is three times for having the chromium passivating liquid processing metal surface service life, its neutral salt spray resistance index can reach 500 hours, passivation time only needs 6-150 seconds, and it is suitable for the passivation of copper alloy and manganese metal, and raw material sources are extensive, non-hazardous to the health of environment and people.
Description
Technical field
The present invention relates to field of metal surface treatment technology, refer in particular to it is a kind of for aluminium alloy, copper alloy, manganese metal Chrome-free
Environmentally friendly passivating solution and preparation method thereof.
Background technique
Aluminium alloy has specific gravity small, good thermally conductive and electric conductivity, the object that reflective is strong, easily processed into type and excellent
The advantages that Physicochemical performance, and it is cheap, the parts such as aerospace, communications and transportation, light industry building materials are widely used in, are gently to close
Alloy most widely used in gold, dosage is most；But aluminium alloy it is moist, contain industrial gasses, fuel gas, salinity and dust atmosphere
The destruction that the forms such as spot corrosion, crevice corrosion, stress corrosion and corrosion fatigue easily occur when using in equal environment, influences its use
Service life；Therefore, aluminium alloy prevents the surface state of metal normal reaction frequently with passivation technology in surface formation energy, and it is anti-to improve it
Corrosion, and increase product beauty.Copper alloy and manganese metal equally cause to change colour because of corrosion, influence appearance and industrial application.
Chromate, bichromate passivation are often used in passivation technology at present, and dispersing agent is mainly phosphate or alkyl
Phenol polyethenoxy base ethers environmental hormone class dispersing agent, since chromium passivating contains poisonous and hazardous trivalent chromium or Cr VI, and phosphorus
Acid esters and person's alkylphenol-polyethenoxy base ethers environmental hormone in the natural environment can not natural degradation, can be to environment and people
Health causes serious injury.
Summary of the invention
One kind is provided the invention aims to overcome the deficiencies in the prior art has high stability and corrosion resistance, and
Environmentally friendly chromium-free environment-friendly passivating solution and preparation method thereof.
In order to achieve the above objectives, the technical solution adopted by the present invention is that: a kind of chromium-free environment-friendly passivating solution, comprising below at
Point: purity be 99.99% or more rare-earth salts accounting 0.5%-5%, dispersing agent 1-3%, buffer 2-5%, preservative 1%,
PH adjusts liquid 1%, deionized water surplus.
Preferably, the dispersing agent is alkyl glycosides dispersing agent.
Preferably, the buffer is the mixture of citric acid and citrate.
Preferably, the pH adjustment liquid is sodium gluconate or oxalic acid.
A kind of preparation method of chromium-free environment-friendly passivating solution includes following preparation step:
(1) first rare-earth salts is purified, purity is made to be reached for 99.99% or more；
(2) purity is placed in electricity for 99.99% or more rare-earth salts, dispersing agent, buffer, preservative, deionized water again
Chromium-free environment-friendly passivating solution is obtained after high-speed uniform dispersion in magnetic blender；
(3) it is eventually adding the pH value of pH adjustment liquid adjustment chromium-free environment-friendly passivating solution.
Preferably, the dispersing agent is alkyl glycosides dispersing agent.
Preferably, the buffer is the mixture of citric acid and citrate.
Preferably, the pH adjustment liquid is sodium gluconate or oxalic acid.
Preferably, the whipping temp of the electromagnetic mixer is 10-60 DEG C.
Due to the application of the above technical scheme, compared with the prior art, the invention has the following advantages:
1, chromium-free environment-friendly passivating solution of the present invention can form regular octahedron structure, band gap with aluminium atom using rare-earth salts
It reduces, crystallization refinement, therefore being capable of electrochemical corrosion resistant；And it is suitable for the passivation of copper alloy and manganese metal, improve corrosion resistance
Can, it prevents from influencing appearance and use because of corrosive chameleon；And dispersing agent is the alkyl glycosides of environmental protection developed by native starch
Dispersing agent, in the natural environment can be degradable, and nano-scale rare earth element is non-hazardous to environment；
2, the preparation method step of chromium-free environment-friendly passivating solution of the present invention is simple, easily operated, is suitble to extensive work
Industry metaplasia produces；Raw material sources are extensive, and reaction medium is non-corrosive, can recycle；Yield is higher, is easy to purify；React item
Part is mild, and synthesis under normal pressure, low energy consumption.
Detailed description of the invention
Technical scheme of the present invention is further explained with reference to the accompanying drawing:
Attached drawing 1 is the flow chart that chromium-free environment-friendly of the present invention is passivated liquid and preparation method thereof；
Attached drawing 2 is chromium-free environment-friendly passivating solution of the present invention under 20,000 times of cold field emission scanning electron microscope in 3003 aluminum alloy surface shapes
At passivation layer plan view；
Attached drawing 3 forms for existing trivalent chromium passivating liquid under 20,000 times of cold field emission scanning electron microscope in 3003 aluminum alloy surfaces blunt
Change layer plane figure.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment, the present invention is described in further details.
As shown in Figure 1, the present invention provides a kind of preparation method of chromium-free environment-friendly passivating solution, including following preparation step:
S1: first purifying rare-earth salts, and purity is made to be reached for 99.99% or more；
S2: purity is placed in electricity for 99.99% or more rare-earth salts, dispersing agent, buffer, preservative, deionized water again
Chromium-free environment-friendly passivating solution is obtained after high-speed uniform dispersion in magnetic blender；
S3: the pH value for being eventually adding pH adjustment liquid adjustment chromium-free environment-friendly passivating solution is 1-5.
Specifically, the step S1 is rare-earth salts purification, comprising:
S11, rare-earth salts is added in ionic liquid A and is dispersed, the weight ratio of the rare earth element and ionic liquid A are
1:1, reaction temperature is 90-110 DEG C, and is passed through carbon dioxide or ammonia, obtains sediment and ionic liquid B；
Wherein, the rare earth is one of cerium, lanthanum, praseodymium, neodymium, promethium, samarium, europium, gadolinium or a variety of；The purity of the rare-earth salts
>=99.99%.
The ionic liquid A selects three cyanogen first salt of 1- ethyl-3-methylimidazole, 1- butyl -3- methylimidazole tetrafluoro boric acid
Salt, 1- butyl -3- methylimidazole hexafluorophosphate, 1- butyl -3- methylimidazole fluoroform sulphonate, 1- butyl -3- methyl miaow
Azoles bis-trifluoromethylsulfoandimide salt, -2 imidazolone of 1,3- dimethyl, chlorination 1,3- bis- (9- methyl anthracene) imidazoles, 1- ethyl -3-
Any one or more of methyl imidazolium tetrafluoroborate, 1- ethyl-3-methylimidazole bis-trifluoromethylsulfoandimide salt.
Preferably, the rare earth element is added in ionic liquid A with carbonate or ammonium salt and is dispersed.
The present invention adds rare earth element, cooperates ionic liquid, regular octahedron structure can be capable of forming with aluminium atom, band gap subtracts
It is few, crystallization refinement, therefore being capable of electrochemical corrosion resistant；Moreover, the present invention must can be worked with high-purity rare-earth, if dilute
Impurity is more in soil, will cause the disorder of aluminium alloy and rare earth crystallization, corrosion resistant effect is not achieved.
The molar ratio mole ratio of the mixture of the carbon dioxide or nitrogen and rare earth element and ionic liquid A is 1:
1.2；For the present invention by the way that carbon dioxide or ammonia to be passed through in the mixing liquid of rare earth element and ionic liquid A, residue is height
Purity rare-earth precipitation and a small amount of ionic liquid B.
It is further preferred that the preparation method further include: the gas for generating step S11, which is pumped into, to be absorbed in slot, is obtained
Chemical fertilizer, wherein the absorption slot is soda lime.
S12, sediment and ionic liquid B are put into grinder and are ground, obtain the nanometer material that partial size is 1-2nm
Material；
Preferably, the grinder is diamond lapping machine.
High-purity rare-earth material is made, is realized using chemical colloidal sol, gel method；But it is realized in chemical sol-gel processes
Process in, the reunion between rare earth ion is very serious, if the precipitation method production rare earth particle it is excessive, influence rare earth
Diffusion in aluminium, to influence the chemical reaction that aluminium atom generates regular octahedron.
Inventor is by a large amount of it is demonstrated experimentally that partial size of the rare earth element optimum dispersion in aluminium is no more than 2nm, therefore
High-purity rare-earth is made using sol-gal process, grinding is necessary condition；Common grinding method is " bead mill ", often uses " zirconium
Pearl " or " aluminium pill " are used as abrasive media, and milling time is long, and pearl abrasion can bring secondary pollution, reduce the purity of rare earth.
This polishing can bring new impurity into, to influence the corrosion resistance of rare earth aluminium alloy.
The present invention uses diamond lapping machine, does not have abrasive media, only achievees the effect that grinding by diamond cavity；
Particle is ground in the intracavitary generation reciprocating collision of diamond lap, generates energy, to realize grinding refinement.
The present invention by the size controlling of nano material in 2nm hereinafter, avoid the reunion between rare earth ion, ensure that rare earth
Diffusion in aluminium, to guarantee that aluminium atom forms regular octahedron structure.
S13, nano material is evaporated under reduced pressure, nanoparticle is obtained by extraction；
S14, nanoparticle is cleaned into simultaneously heating, drying, obtains the rare-earth salts that purity is 99.99% or more.
Preferably, nano particles by using deionized water is cleaned, carries out heating baking under conditions of temperature is 100-130 DEG C
It is dry.
More preferably, nano particles by using deionized water is cleaned, carries out heating, drying under conditions of temperature is 105 DEG C.
In short, the present invention is chemically reacted by solid phase synthesis process using the high velocity impact in diamond lapping machine,
So that chemistry displacement reaction under solid state shape, occurs for rare earth ammonium salt, rare earth carbonate, the purification of rare earth element is realized；Solid
Particle high speed collision, the heat of generation accelerate reaction speed, meanwhile, it also is heated acting using gas, has exhausted exhaust gas；
It, will not chemical erosion diamond lap cavity as by-product water and ammonia, carbon dioxide gas when displacement reaction occurs；
The gas that reaction generates obtains the fertilizer of production agricultural demand by soda lime absorbent by absorption tower.
Preparation method step of the invention is simple, easily operated, is suitble to large-scale industrial production；Raw material sources are extensive,
Reaction medium is non-corrosive, can recycle；Yield is higher, is easy to purify；Reaction condition is mild, and synthesis under normal pressure, low energy consumption.
With specific embodiment, the present invention is further explained below
Embodiment 1
S1, rare-earth salts purification:
S11: by cerium, the carbonate of praseodymium, which is added in three cyanogen first salt of 1- ethyl-3-methylimidazole, to be dispersed, and reaction temperature is
90 DEG C, and it is passed through carbon dioxide, sediment and ionic liquid B are obtained, the gas of generation is imported into soda lime absorbent slot, by alkali
Chemical fertilizer is made in lime absorption；
S12: being put into sediment and ionic liquid B in diamond lapping machine and grind, grinds 1 hour, obtains partial size
For the nano material of 1-2nm；
S13: nano material is evaporated under reduced pressure, and nanoparticle is obtained by extraction；
S14: the deionized water of nanoparticle conductivity < 1 is cleaned, and is heated under conditions of temperature is 100 DEG C
Drying obtains the rare-earth salts that purity is 99.99% or more.
S2, the again rare-earth salts by purity for 99.99% or more, alkyl glycosides dispersing agent, buffer, preservative, deionization
Water is placed in high-speed stirred in electromagnetic mixer, and whipping temp is 75 DEG C, and chromium-free environment-friendly passivating solution is obtained after evenly dispersed；
S3: the pH value for being eventually adding sodium gluconate and oxalic acid adjustment chromium-free environment-friendly passivating solution is 4.2.
Embodiment 2
S1, rare-earth salts purification:
S11: by cerium, the carbonate of lanthanum, which is added in 1- butyl -3- methylimidazole hexafluorophosphate, to be dispersed, reaction temperature
It is 95 DEG C, and is passed through ammonia, obtain sediment and ionic liquid B, the gas of generation is imported into soda lime absorbent slot, by alkali stone
Ash, which absorbs, makees chemical fertilizer；
S12: being put into sediment and ionic liquid B in diamond lapping machine and grind, grinds 2 hours, obtains partial size
For the nano material of 1-2nm；
S13: nano material is evaporated under reduced pressure, and nanoparticle is obtained by extraction；
S14: nanoparticle is spent into conductivity < 1 ionized water and is cleaned, carries out heating baking under conditions of temperature is 110 DEG C
It is dry, obtain the rare-earth salts that purity is 99.99% or more.
S2, the again rare-earth salts by purity for 99.99% or more, alkyl glycosides dispersing agent, buffer, preservative, deionization
Water is placed in high-speed stirred in electromagnetic mixer, and whipping temp is 75 DEG C, and chromium-free environment-friendly passivating solution is obtained after evenly dispersed；
S3, be eventually adding sodium gluconate and oxalic acid adjustment chromium-free environment-friendly passivating solution pH value be 4.5.
Embodiment 3
S1, rare-earth salts purification:
S11: by cerium, lanthanum, the nitrate of praseodymium, which is added in 1- butyl -3- methylimidazole bis-trifluoromethylsulfoandimide salt, to be divided
It dissipates, reaction temperature is 100 DEG C, and is passed through carbon dioxide, obtains sediment and ionic liquid B, the gas of generation is imported into alkali stone
Ash absorbs in slot, makees chemical fertilizer by soda lime absorbent；
S12: being put into sediment and ionic liquid B in diamond lapping machine and grind, grinds 3 hours, obtains partial size
For the nano material of 1-2nm；
S13: nano material is evaporated under reduced pressure, and nanoparticle is obtained by extraction；
S14: nanoparticle is spent into conductivity < 1 ionized water and is cleaned, carries out heating baking under conditions of temperature is 115 DEG C
It is dry, obtain the rare-earth salts that purity is 99.99% or more.
S2, the rare-earth salts by purity for 99.99% or more, alkyl glycosides dispersing agent, buffer, preservative, deionized water
It is placed in high-speed stirred in electromagnetic mixer, whipping temp is 75 DEG C, and chromium-free environment-friendly passivating solution is obtained after evenly dispersed；
S3, be eventually adding sodium gluconate and oxalic acid adjustment chromium-free environment-friendly passivating solution pH value be 4.8.
Embodiment 4
S1, rare-earth salts purification:
S11: by cerium, lanthanum, the nitrate of praseodymium, which is added in 1- butyl -3- methylimidazole bis-trifluoromethylsulfoandimide salt, to be divided
It dissipates, reaction temperature is 100 DEG C, and is passed through carbon dioxide, obtains sediment and ionic liquid B, the gas of generation is imported into alkali stone
Ash absorbs in slot, makees chemical fertilizer by soda lime absorbent；
S12: being put into sediment and ionic liquid B in diamond lapping machine and grind, grinds 3 hours, obtains partial size
For the nano material of 1-2nm；
S13: nano material is evaporated under reduced pressure, and nanoparticle is obtained by extraction；
S14: nanoparticle is spent into conductivity < 1 ionized water and is cleaned, carries out heating baking under conditions of temperature is 115 DEG C
It is dry, obtain the rare-earth salts that purity is 99.99% or more.
S2, the rare-earth salts by purity for 99.99% or more, alkyl glycosides dispersing agent, buffer, preservative, deionized water
It is placed in high-speed stirred in electromagnetic mixer, whipping temp is 75 DEG C, and chromium-free environment-friendly passivating solution is obtained after evenly dispersed；
S3, be eventually adding sodium gluconate and oxalic acid adjustment chromium-free environment-friendly passivating solution pH value be 2.8.
According to embodiment 1-3, choose 3003 aluminiums, by oil removing → washing → alkali cleaning oxide film dissolving → washing → table tune →
After the passivation technologies such as washing → passivation → baking, establishing criteria GB/T 10125-2012 tests artificial aerosol corrosion examination respectively
It tests and salt spray test, 21-25 DEG C of test temperature, testing time 500H, the results are shown in Table 1:
The artificial aerosol corrosion test of table 1 and salt spray test
As seen from the above table, embodiment 1-3 is basic without corruption after the artificial aerosol corrosion test and salt spray test of 500h
Erosion has preferable corrosion resistance；As shown in Fig. 2, chromium-free environment-friendly passivating solution can be formed uniformly carefully in 3003 aluminum alloy surfaces
The close passivation layer in scale structure, as shown in figure 3, trivalent chromium passivating liquid can have in the passivation layer that 3003 aluminum alloy surfaces are formed
Apparent metal tumor and protrusion, and the scale layer gap formed is larger, so etchant gas or liquid are easy to pass through larger seam
Gap penetrates into metal surface and causes pitting corrosion, and therefore, the metal surface of chromium-free environment-friendly passivating solution passivation is in electrochemical corrosion phase
It is three times for having the chromium passivating liquid processing metal surface service life, it is small that the neutral salt spray resistance index of detection can achieve 500 under the conditions of
When, passivation time only needs 6-150 seconds.
According to embodiment 4, the electrolytic manganese of electrolytic cell is taken out, after the passivation technologies such as washing → passivation → baking, with chromium
It is as shown in table 4 to be passivated spontaneous corrosion evaluation of result:
The spontaneous corrosion comparison sheet of table 2 environmental protection passivation manganese and chromium passivating manganese
| Time (day) | Environmental protection passivation manganese | Chromium passivating manganese |
| 1 | Silvery white | Silvery white |
| 5 | Silvery white | Silvery white |
| 15 | Silvery white | Silvery white |
| 20 | Silvery white | Silvery white |
| 25 | Silvery white | Silvery white |
| 30 | Silvery white | White hair ash |
| 35 | White hair ash | White hair ash |
| 40 | White hair ash | It is greyish white |
| 45 | White hair ash | It is greyish white |
| 50 | It is greyish white | Grey |
As seen from the above table, chromium environmental protection passivating solution of the present invention is also applied for the passivation of manganese metal, substantially increases anti-
Oxidation susceptibility and corrosion resistance；Similarly, it is also applied for the passivation of copper alloy, prevents copper alloy and manganese metal because of corrosive chameleon
Influence appearance and use.
Due to the application of the above technical scheme, compared with the prior art, the invention has the following advantages:
1, chromium-free environment-friendly passivating solution of the present invention purifies extraction process using rare-earth salts cooperation ionic liquid, and preparation is received
Meter level rare earth material；By high speed dispersion technique, applied in metal passivation technology after forming passivation dispersion liquid；Meanwhile rare earth
Element and aluminium atom are capable of forming regular octahedron structure, and band gap is reduced, crystallization refinement, therefore being capable of electrochemical corrosion resistant；And it is suitable
For the passivation of copper alloy and manganese metal, corrosion resistance is improved, prevents from influencing appearance and use because of corrosive chameleon；And disperse
Agent is the alkyl glycosides dispersing agent of environmental protection developed by native starch, in the natural environment can be degradable, and nanoscale is dilute
Earth elements are non-hazardous to environment；
2, chromium-free environment-friendly passivating solution of the present invention utilizes the high speed in diamond lapping machine by solid phase synthesis process
Collision chemically reacts, so that chemistry displacement reaction under solid state shape, occurs for rare earth carbonate, rare earth nitrades, realizes
The purification of rare earth element；Solids high velocity impact, the heat of generation accelerate reaction speed, meanwhile, also added using gas
Heat acting, has exhausted exhaust gas；It, will not chemical erosion Buddha's warrior attendant as by-product water, carbon dioxide gas when displacement reaction occurs
Stone grinding cavit, the gas for reacting generation obtain the fertilizer of production agricultural demand by soda lime absorbent by absorption tower；
3, the preparation method step of chromium-free environment-friendly passivating solution of the present invention is simple, easily operated, is suitble to extensive work
Industry metaplasia produces；Raw material sources are extensive, heavy metal free, no APEO environmental hormone, no inorganic acid, phosphate free, BOD, COD value
Low, reaction medium is non-corrosive, can recycle；Yield is higher；Reaction condition is mild, and synthesis under normal pressure, low energy consumption.
The above is only specific application examples of the invention, are not limited in any way to protection scope of the present invention.All uses
Equivalent transformation or equivalent replacement and the technical solution formed, all fall within rights protection scope of the present invention.
Claims (5)
1. a kind of preparation method of chromium-free environment-friendly passivating solution, which is characterized in that preparation step is as follows:
(1) first rare-earth salts is purified, purity is made to be reached for 99.99% or more；
(2) purity is placed in electromagnetism and stirred for 99.99% or more rare-earth salts, dispersing agent, buffer, preservative, deionized water again
It mixes in machine and obtains chromium-free environment-friendly passivating solution after high-speed uniform dispersion；
(3) it is eventually adding the pH value of pH adjustment liquid adjustment chromium-free environment-friendly passivating solution；
In step (1), rare-earth salts is added in ionic liquid A and is dispersed, the weight ratio of the rare earth element and ionic liquid A
For 1:1, reaction temperature is 90-110 DEG C, and is passed through carbon dioxide or ammonia, obtains sediment and ionic liquid B；
The ionic liquid A selects three cyanogen first salt of 1- ethyl-3-methylimidazole, 1- butyl -3- methyl imidazolium tetrafluoroborate, 1-
Butyl -3- methylimidazole hexafluorophosphate, 1- butyl -3- methylimidazole fluoroform sulphonate, 1- butyl -3- methylimidazole double three
Fluorine sulfonamide, -2 imidazolone of 1,3- dimethyl, chlorination 1,3- bis- (9- methyl anthracene) imidazoles, 1- ethyl -3- methyl miaow
Any one or more of azoles tetrafluoroborate, 1- ethyl-3-methylimidazole bis-trifluoromethylsulfoandimide salt；
Sediment and ionic liquid B are put into diamond lapping machine and are ground, is ground 1 hour, obtaining partial size is 1-2nm's
Nano material；
Nano material is evaporated under reduced pressure, nanoparticle is obtained by extraction；
By nanoparticle cleaning and heating, drying, the rare-earth salts that purity is 99.99% or more is obtained.
2. the preparation method of chromium-free environment-friendly passivating solution according to claim 1, it is characterised in that: the dispersing agent is alkyl
Glucosides dispersing agent.
3. the preparation method of chromium-free environment-friendly passivating solution according to claim 1, it is characterised in that: the buffer is lemon
The mixture of acid and citrate.
4. the preparation method of chromium-free environment-friendly passivating solution according to claim 1, the pH adjustment liquid be sodium gluconate or
Oxalic acid.
5. the preparation method of chromium-free environment-friendly passivating solution according to claim 1, it is characterised in that: the electromagnetic mixer
Whipping temp is 10-60 DEG C.
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| CN105603409A (en) * | 2016-01-15 | 2016-05-25 | 华南理工大学 | Normal-temperature alkaline chromium-free passivation solution and passivation method for aluminum alloy |
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| US5478413A (en) * | 1994-12-27 | 1995-12-26 | Sermatech International, Inc. | Environmentally friendly coating compositions |
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| CN101250699A (en) * | 2008-03-27 | 2008-08-27 | 武汉科技大学 | Chromium-free passivation liquid for galvanized sheet and manufacture method thereof |
| CN101717931A (en) * | 2009-12-22 | 2010-06-02 | 上海大学 | Rare-earth ion compound passivant used for copper surface passivation and preparation method thereof |
| CN105603409A (en) * | 2016-01-15 | 2016-05-25 | 华南理工大学 | Normal-temperature alkaline chromium-free passivation solution and passivation method for aluminum alloy |
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