CN102234800A - Aluminum alloy rare earth passivating liquid taking chlorine salt as accelerator and use method thereof - Google Patents
Aluminum alloy rare earth passivating liquid taking chlorine salt as accelerator and use method thereof Download PDFInfo
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- CN102234800A CN102234800A CN 201110211226 CN201110211226A CN102234800A CN 102234800 A CN102234800 A CN 102234800A CN 201110211226 CN201110211226 CN 201110211226 CN 201110211226 A CN201110211226 A CN 201110211226A CN 102234800 A CN102234800 A CN 102234800A
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Abstract
The invention discloses an aluminum alloy rare earth passivating liquid taking a chlorine salt as an accelerator. The aluminum alloy rare earth passivating liquid can simultaneously meet the requirements of fast film formation and maintain a treatment liquid to be stable for a long term. The rare earth passivating liquid consists of the following components: 5-25g/L of cerium salt, 1-5g/L of oxidant and 0.1-1.5g/L of film-forming accelerator. By addition of the accelerator, aluminum alloy can be filmed at room temperature within 4-15 minutes, and the service life of a rare earth conversion liquid can be maintained so that the rare earth conversion liquid is not precipitated for more than 30 days. According to the invention, an additive is non-toxic and environmentally-friendly, the corrosion resistance of the aluminum alloy subjected to film formation is good, operation is simple, and batch production is easily carried out.
Description
Technical field
The present invention relates to aluminum alloy surface rare earth chemical passivation liquid, particularly promotor is the passivating solution of villaumite, and passivating solution of the present invention can satisfy fast filming simultaneously and treatment solution is stable for a long time.
Background technology
Aluminium is one of the element the most widely that distributes in the earth's crust, and its average content is 8.8%, is only second to oxygen and silicon.Its density is little, the intensity height, and no ppolymorphism changes, and ductility, plasticity are good, and the amount of being to use is only second to the second largest metallic substance of iron and steel.Aluminium alloy is very active metal, and under the normal atmospheric condition, aluminum alloy surface is easy to form one deck natural oxide film.This oxide film can protect alloy matrix aluminum no longer further to be corroded in neutral and weakly acidic solution, plays certain protective effect.But for rigorous environment a little, this film that forms naturally in air just is not enough to protect alloy matrix aluminum veritably.What the etch state of aluminium and alloy thereof was common has: pitting attack, galvanic corrosion, crevice corrosion, intergranular corrosion, filiform corrosion and layer corrosion.These corrosion make aluminium alloy cause corrosion fatigue easily under stress, cause the destruction and the inefficacy of material.In order to overcome the shortcoming of aluminum alloy surface aspect of performance, the broadened application scope increases the service life, seek a kind of effective aluminum alloy surface treatment technology and be numerous scientific workers the problem that must face.
In numerous aluminum alloy surface treatment technologies, chromate treating has obtained using extremely widely.The chromate treating of aluminium and alloy thereof uses the solution of basal component as chromic acid, alkali-metal chromic salt or dichromate usually, changes into the chromic salt rete in aluminum alloy surface.This processing technology routine maturation is widely used in many industrial circles such as space flight and aviation, electronics, automobile, machinery, chemical industry.But because of it contains sexavalent chrome, the toxicity height, easily carcinogenic, very big to environmental hazard.Along with the particularly development of electronic product industry of industry, chromic salt is obvious further for the harm of environmental pollution.Raising along with people's environmental consciousness; people have recognized the harm of chromic salt gradually; in order to preserve the ecological environment and to ensure social Sustainable development, control of the pollution of these wastes to environment, the mankind must seek a kind of chemical treatment method that can replace chromic salt.On February 13rd, 2003, the RoHS instruction has been issued in European Union.RoHS instructs regulation, and from July 1st, 2006, the electronic and electrical equipment of throwing in European Union market must not contain six kinds of hazardous and noxious substances such as sexavalent chrome.
After chromate treating skill technology obtains prohibiting, seek and a kind ofly can replace chromic surface treatment method extremely urgent especially, also caused the concern of many Chinese scholars and carried out a large amount of research simultaneously.For the research of aluminium alloy non-chromium chemically transformed film technique, start from the seventies in last century abroad, domestic then than later.Present chemically transformed film technique has multiple, and as molybdate, titanium zirconates, tungstate, vanadate, tannate and permanganate, rare earth metal, lithium salts, phosphoric acid salt and silane etc., but most of technology all has certain gap with traditional chromic acid salt Passivation Treatment.
The rare earth passivation technology is to study to such an extent that compare a kind of technology early, but roughly experiences simply immersing method, interpolation oxygenant acceleration film forming, interpolation promotor and other subsidiaries so that it has mass-producing use three phases.Have and report that the effect of rare-earth conversion coatings can meet or exceed traditional chromating liquid, rare earth chemical conversion treatment method also is considered to be hopeful most one of method that replaces chromate conversion coating.
From present result of study, all there is certain shortcoming in various rare earth processing methods.Oversize as single rare earth soaking technology required time, be not suitable for industrial production; Ce-Mo treatment process then temperature is too high, and experimental cost is big, complex steps; The fused salt soaking technology also needs higher temperature, and easy care not.Though the technology that contains oxygenant or promotor is the short period of time film forming at room temperature, but conversion film is easy to crack, the existence of crackle will inevitably cause negative impact to the performance of rete, be to cause its film performance far away from one of reason of chromate treating technology, and conversion film rimose reason now also nobody carry out deep research.
The poor stability that very big shortcoming of rare earth passivating solution is its solution, conversion film solution aging speed is fast.After adding promotor and oxygenant, film forming speed and stability of solution are negative correlation.Such as H
2O
2Being the important oxygenant that improves film forming speed, also is the object of Chinese scholars favor.But H
2O
2In water body solution, easily decompose, be accelerated into the aging of coating solution.KMnO
4During as strong oxidizer,, containing film forming accelerator and Ce though stability promotes to some extent
3+Solution in can be reduced into the lower valency oxide compound, as MnO
2Precipitate, cause the stability decreases of solution.Under acidic conditions, MnO
2Can quicken KMnO again
4Decompose its oxidizing property of mistake.This shortcoming has a strong impact on its technology stability and commercial application.How can guarantee the comparability of processing condition and chromate treating technology, guarantee that again the stability of treatment solution and the performance of conversion film are the problems that needs solution.The adding of promotor provided by the invention is fast filming at room temperature not only, can improve the corrosion resisting property of conversion film, and the satisfactory stability performance is arranged.
Summary of the invention
The objective of the invention is to overcome existing technical problem, a kind of film forming accelerating is provided, prepare a kind of aluminium alloy rare earth conversion fluid, make it can satisfy fast filming, can keep treatment solution stable for a long time simultaneously again.
Purpose of the present invention can realize by following technical solution.
Promotor is the aluminium alloy rare earth passivating solution of villaumite, is made up of 5 ~ 25g/L cerium salt, 1 ~ 5g/L oxygenant and 0.1 ~ 1.5g/L film forming accelerating;
Described oxygenant is selected from one or more in potassium permanganate, ammonium persulphate, potassium perchlorate or the Potcrate;
Described film forming accelerating is a villaumite.
Described cerium salt is selected from one or both in hydration Cerium II Chloride or the nitric hydrate cerium.
In preferred Repone K of described villaumite or the sodium-chlor one or both.
Use described aluminium alloy rare earth passivating solution and handle the method for aluminium alloy, comprise the steps:
(1) aluminum alloy surface pre-treatment: aluminum alloy surface is implemented mechanical polishing, adopt weakly alkaline solution ultrasonic cleaning 4 ~ 10 minutes, flooded 2 ~ 4 minutes at basic solution again after the rinsing, flooded 1 ~ 3 minute at acidic solution again after the rinsing, dry after the rinsing; The anhydrous sodium carbonate that consists of 8 ~ 10g/L of weakly alkaline solution and the water glass of 5 ~ 15g/L; The sodium hydroxide that consists of 8 ~ 12g/L of basic solution and the anhydrous sodium carbonate of 6 ~ 8g/L, acidic solution consist of 10 wt% ~ 15wt %HNO
3, 2wt % ~ 4wt %H
3PO
4With 1.5～3wt %H
2SO
4
(2) pretreated aluminium alloy is put into the described passivating solution of claim 1, handled promptly obtaining rare-earth conversion coatings in 5 ~ 15 minutes at 15 ~ 35 ℃ down in aluminum alloy surface.
The preferred control surface roughness of described mechanical polishing is 0.01 ~ 15 micron.
The present invention compares with prior art, has following advantage and beneficial effect:
(1) the present invention is suitable for the surface conversion treatment of multiple series alloys, the rare-earth conversion coatings even compact that is obtained, and corrosion resisting property is good, does not contain sexavalence or trivalent chromium to environment and human body harmful in the coating.
(2) additive of the present invention's use can make conversion fluid handle aluminium alloy at ambient temperature, need not heating, and film forming speed is very fast, near traditional chromate treating film forming speed.After passivating solution adds villaumite, active Cl
-Aluminium is had very strong corrodibility, can accelerate surfaces A l
2O
3Dissolution rate, on the one hand the Al alloy substrate is exposed fast, accelerate the dissolving of aluminum substrate, accelerate the reaction process of micro anode, help that cathodic reaction is a large amount of simultaneously to be taken place, thereby make Ce-Mn conversion film uniform deposition.On the other hand, Cl
-Following reaction takes place in the time of corrosive:
Al(OH)
3?+?Cl
-?→Al(OH)
2Cl?+?OH
-
Al(OH)
2Cl?+?Cl
-?→Al(OH)Cl
2?+?OH
-
Al(OH)Cl
2?+?Cl
-?→AlCl
3?+?OH
-
This just makes OH in the passivating solution
-Ionic concn increases, and promptly the pH value raises, and has created condition for cerium, the oxyhydroxide of manganese and the formation of oxide precipitation like this.When pH was elevated to a certain degree, the oxyhydroxide of cerium, manganese and aluminium and oxide compound just under micro cathode district deposition, formed precipitation membrane.
(3) in existing technology, film forming speed and treatment solution life-span are negative correlation, have accelerated the aging of rare earth treatment solution when film forming speed is fast.Additive therefor of the present invention can remedy this shortcoming, is accelerating the film forming while, treatment solution is preserved in open atmospheric environment continued after 15 days to use, and obtains quality rare-earth conversion coatings preferably.With low cost, simple to operate.
Description of drawings
Fig. 1 by embodiment 1 the SEM figure of acquisition rare-earth conversion coatings
Fig. 2 by embodiment 1 the polarization curve of acquisition rare-earth conversion coatings
Fig. 3 by embodiment 1 the EDS figure of acquisition rare-earth conversion coatings.
Embodiment
In order to understand technical characterstic of the present invention better, the present invention is further illustrated below in conjunction with embodiment, need to prove, embodiment is not a limiting the scope of the invention.
1: 6063 aluminium alloy extrusions (1.5mm) of embodiment surface rare earth conversion processing
Aluminum alloy surface rare earth chemical conversion treatment method comprises the steps:
(1) pre-treatment: (a) from 6063 large-sized aluminium alloy section bars (thickness 1.5mm) intercepting, 5 * 5cm
25 on sample and punching, with the SiC liquid honing to surfaceness at 10 microns, and surface contaminants is cleaned up and dries up with air duct with tap water, connect with fine rule in punching place; (b) weak erosion basic solution is put into the ultrasonic cleaning machine, put into the aluminium alloy test piece, ultrasonic cleaning 8 minutes cleans up with deionized water then; Volume ratio meter by weight, the anhydrous sodium carbonate that weak erosion basic solution is 8g/L, the water glass of 6g/L configuration deionized water solution; (c) test piece was put into the basic solution dipping 3 minutes, clean with rinsed with deionized water afterwards; Volume ratio by weight, each component concentrations is the sodium hydroxide of 8g/L, the anhydrous sodium carbonate of 7g/L in this basic solution; (d) test piece was put into the acidic solution dipping 2 minutes, use washed with de-ionized water then, and dry up with air duct; By mass percentage, acidic solution is by 15%HNO
3, 2%H
3PO
4, 2%H
2SO
4Form.
(2) rare earth chemistry conversion treating solution configuration: configuration rare earth conversion treating solution 1000ml, wherein the bulking value specific concentration of various compositions is as follows in the treatment solution: rare-earth salts 5g/L, hydration Cerium II Chloride 4g/L wherein, nitric hydrate cerium 1g/L; Oxidant potassium permanganate 2g/L; Film forming accelerating is selected 0.6g/L sodium-chlor for use.Collocation method is settled to 1000ml again for each raw material is dissolved in the less water by prescription.
(3) the aluminum alloy surface rare earth chemical conversion is handled: will insert filling in the described treatment solution stainless steel of step (2) clean container of hanger through the pretreated aluminium alloy of step (1), and flood under 25 ℃ temperature, film forming was finished in 15 minutes.Aluminium alloy is suspended on the hanger with fine rule and immerses in the treatment solution, floods after 15 minutes, takes out test piece, cleans up and dries up with air duct with tap water.
The even film layer densification that obtains, golden yellow color.Dynamic electrochemical tests result in 3.5% sodium-chlor neutral electrolyte is: the corrosion electric current density of untreated 6063 aluminium alloys is 5.8 μ A/cm
26063 corrosion of aluminium alloy electric currents through this instance processes are 0.095 μ A/cm
2, XPS analysis shows in the rete based on 4 valency ceriums and 4 valency manganese.
2: 6063 aluminium alloy extrusions (1.5mm) of embodiment surface rare earth conversion processing
Aluminum alloy surface rare earth chemical conversion treatment method comprises the steps:
(1) pre-treatment: (a) from 6063 large-sized aluminium alloy section bars (thickness 1.5mm) intercepting, 3 * 3cm
25 on sample and punching, with the SiC liquid honing to surfaceness at 0.01 micron, and surface contaminants is cleaned up and dries up with air duct with tap water, connect with fine rule in punching place; (b) weak erosion basic solution is put into the ultrasonic cleaning machine, put into the aluminium alloy test piece, ultrasonic cleaning 4 minutes cleans up with deionized water then; Volume ratio meter by weight, the anhydrous sodium carbonate that weak erosion basic solution is 10g/L, the water glass of 15g/L configuration deionized water solution; (c) test piece was put into the basic solution dipping 4 minutes, clean with rinsed with deionized water afterwards; Volume ratio by weight, each component concentrations is the sodium hydroxide of 12g/L, the anhydrous sodium carbonate of 8g/L in this basic solution; (d) test piece was put into the acidic solution dipping 3 minutes, use washed with de-ionized water then, and dry up with air duct; By mass percentage, acidic solution is by 10%HNO
3, 4%H
3PO
4, 3%H
2SO
4Form.
(2) rare earth chemistry conversion treating solution configuration: configuration rare earth conversion treating solution 1000ml, wherein the weight or meausurement percentage concentration of various compositions is as follows in the treatment solution: cerous nitrate 10g/L; Oxidant potassium permanganate 1.5g/L; Film forming accelerating is selected 0.4g/L sodium-chlor for use.
(3) the aluminum alloy surface rare earth chemical conversion is handled: will insert filling in the described treatment solution stainless steel of step (2) clean container of hanger through the pretreated aluminium alloy of step (1), and flood under 15 ℃ temperature, film forming was finished in 5 minutes.Aluminium alloy is suspended on the hanger with fine rule and immerses in the treatment solution, floods after 15 minutes, takes out test piece, cleans up and dries up with air duct with tap water.
The even film layer densification that obtains, golden yellow color.Dynamic electrochemical tests result in 3.5% sodium-chlor neutral electrolyte is: the corrosion electric current density of untreated 6063 aluminium alloys is 5.8 μ A/cm
26063 corrosion of aluminium alloy electric currents through this instance processes are 0.156 μ A/cm
2, XPS analysis shows in the rete based on 4 valency ceriums and 4 valency manganese.
3: 6063 aluminium alloy extrusions (1.5mm) of embodiment surface rare earth conversion processing
Aluminum alloy surface rare earth chemical conversion treatment method comprises the steps:
(1) pre-treatment: (a) aluminum alloy surface is implemented mechanical polishing and handle, the control surface roughness is at 8 microns; (b) weak erosion basic solution is put into the ultrasonic cleaning machine, put into the aluminium alloy test piece, ultrasonic cleaning 10 minutes cleans up with deionized water then; Volume ratio meter by weight, the anhydrous sodium carbonate that weak erosion basic solution is 8g/L, the water glass of 5g/L configuration deionized water solution; (c) test piece was put into the basic solution dipping 2 minutes, clean with rinsed with deionized water afterwards; Volume ratio by weight, each component concentrations is the sodium hydroxide of 8g/L, the anhydrous sodium carbonate of 6g/L in this basic solution; (d) test piece was put into the acidic solution dipping 1 minute, use washed with de-ionized water then, and dry up with air duct; By mass percentage, acidic solution is by 10%HNO
3, 2%H
3PO
4, 1.5%H
2SO
4Form.
(2) rare earth chemistry conversion treating solution configuration: configuration rare earth conversion treating solution 1000ml, wherein the weight or meausurement percentage concentration of various compositions is as follows in the treatment solution: nitric hydrate cerium 15g/L; Oxidant potassium permanganate 1g/L; Ammonium persulphate 1g/L, film forming accelerating is selected 0.1g/L sodium-chlor for use.
(3) the aluminum alloy surface rare earth chemical conversion is handled: will insert filling in the described treatment solution stainless steel of step (2) clean container of hanger through the pretreated aluminium alloy of step (1), and flood under 15 ℃ temperature, film forming was finished in 15 minutes.Aluminium alloy is suspended on the hanger with fine rule and immerses in the treatment solution, floods after 15 minutes, takes out test piece, cleans up and dries up with air duct with tap water.
The even film layer densification that obtains, rice-pudding look.Dynamic electrochemical tests result in 3.5% sodium-chlor neutral electrolyte is: the corrosion electric current density of untreated 6063 aluminium alloys is 5.8 μ A/cm
26063 corrosion of aluminium alloy electric currents through this instance processes are 0.212 μ A/cm
2, XPS analysis shows in the rete with 4 valency ceriums.
4: 6061 aluminium alloy extrusions (1.5mm) of embodiment surface rare earth conversion processing
Aluminum alloy surface rare earth chemical conversion treatment method comprises the steps:
(1) pre-treatment: step is with example 1.
(2) rare earth chemistry conversion treating solution configuration: configuration rare earth conversion treating solution 1000ml, wherein the weight or meausurement percentage concentration of various compositions is as follows in the treatment solution: nitric hydrate cerium 25g/L, oxidant potassium permanganate 1g/L; Ammonium persulphate 4g/L, film forming accelerating is selected 1.5/L sodium-chlor for use.
(3) the aluminum alloy surface rare earth chemical conversion is handled: will insert filling in the described treatment solution stainless steel of step (2) clean container of hanger through the pretreated aluminium alloy of step (1), and put into water bath heating and 35 ℃ temperature insulation, film forming was taken out after 5 minutes.Clean up and dry up with tap water with air duct.
Obtain golden yellow coating.Dynamic electrochemical tests result in 3.5% sodium-chlor neutral electrolyte is: the corrosion electric current density of untreated 6061 aluminium alloys is 4.8 μ A/cm
26061 corrosion of aluminium alloy electric currents through this instance processes are 0.212 μ A/cm
2, XPS analysis shows in the rete with 4 valency ceriums.
5: 6063 aluminium alloy extrusions (1.5mm) of embodiment surface rare earth conversion processing
After example 1 is handled, observe and do not have precipitation in the treatment solution.Treatment solution is placed in the air ambient of laboratory and is continued after 10 days to use.
(1) pre-treatment: step is with example 1.
(2) rare earth chemistry conversion treating solution configuration: adopt the treatment solution of placing after 7 days, composition is seen example 1.
(3) the aluminum alloy surface rare earth chemical conversion is handled: will insert filling in the described treatment solution stainless steel of step (2) clean container of hanger through the pretreated aluminium alloy of step (1), and flood under 25 ℃ temperature, film forming was finished in 15 minutes.Aluminium alloy is suspended on the hanger with fine rule and immerses in the treatment solution, floods after 15 minutes, takes out test piece, cleans up and dries up with air duct with tap water.
The even film layer densification that obtains, golden yellow color.XPS analysis shows in the rete based on 4 valency ceriums and 4 valency manganese.
Dynamic electrochemical tests result in 3.5% sodium-chlor neutral electrolyte is: the corrosion electric current density of coating 6063 aluminium alloys is not 5.8 μ A/cm
26063 corrosion of aluminium alloy electric currents through this instance processes are 0.306 μ A/cm
2.
6: 6063 aluminium alloy extrusions (1.5mm) of embodiment surface rare earth conversion processing
After example 2 is handled, observe and do not have precipitation in the treatment solution.Treatment solution is placed in the air ambient of laboratory and is continued after 15 days to use.
(1) pre-treatment: step is with example 2.
(2) rare earth chemistry conversion treating solution configuration: adopt the treatment solution of placing after 10 days, composition is seen example 2.
(3) the aluminum alloy surface rare earth chemical conversion is handled: will insert filling in the described treatment solution stainless steel of step (2) clean container of hanger through the pretreated aluminium alloy of step (1), and put into water bath and be heated to 30 ℃ and constant temperature, film forming was taken out after 8 minutes, cleaned up and dried up with air duct with tap water.
The even film layer densification that obtains, golden yellow color.Dynamic electrochemical tests result in 3.5% sodium-chlor neutral electrolyte is: the corrosion electric current density of untreated 6063 aluminium alloys is 5.8 μ A/cm
26063 corrosion of aluminium alloy electric currents through this instance processes are 0.456 μ A/cm
2, XPS analysis shows in the rete based on 4 valency ceriums and 4 valency manganese.
Claims (5)
1. promotor is the aluminium alloy rare earth passivating solution of villaumite, it is characterized in that, is made up of 5 ~ 25g/L cerium salt, 1 ~ 5g/L oxygenant and 0.1 ~ 1.5g/L film forming accelerating;
Described oxygenant is selected from one or more in potassium permanganate, ammonium persulphate, potassium perchlorate or the Potcrate;
Described film forming accelerating is a villaumite.
2. aluminium alloy rare earth passivating solution according to claim 1 is characterized in that described cerium salt is selected from one or both in hydration Cerium II Chloride or the nitric hydrate cerium.
3. aluminium alloy rare earth passivating solution according to claim 1 is characterized in that described villaumite is one or both in Repone K or the sodium-chlor.
4. application rights requires 1 described aluminium alloy rare earth passivating solution to handle the method for aluminium alloy, it is characterized in that, comprises the steps:
(1) aluminum alloy surface pre-treatment: aluminum alloy surface is implemented mechanical polishing, adopt weakly alkaline solution ultrasonic cleaning 4 ~ 10 minutes, flooded 2 ~ 4 minutes at basic solution again after the rinsing, flooded 1 ~ 3 minute at acidic solution again after the rinsing, dry after the rinsing; The anhydrous sodium carbonate that consists of 8 ~ 10g/L of weakly alkaline solution and the water glass of 5 ~ 15g/L; The sodium hydroxide that consists of 8 ~ 12g/L of basic solution and the anhydrous sodium carbonate of 6 ~ 8g/L, acidic solution consist of 10 wt% ~ 15wt %HNO
3, 2wt % ~ 4wt %H
3PO
4With 1.5～3wt %H
2SO
4
(2) pretreated aluminium alloy is put into the described passivating solution of claim 1, handled promptly obtaining rare-earth conversion coatings in 5 ~ 15 minutes at 15 ~ 35 ℃ down in aluminum alloy surface.
5. method according to claim 4 is characterized in that, described mechanical polishing is that the control surface roughness is 0.01 ~ 15 micron.
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| CN102808170A (en) * | 2012-08-01 | 2012-12-05 | 天津大学 | Treating fluid for corrosion-resistant rare earth conversion film on surface of aluminum alloy, and application method thereof |
| CN105331963A (en) * | 2015-09-29 | 2016-02-17 | 安徽瑞林汽配有限公司 | Aluminum alloy curing and lubricating film and preparation method thereof |
| CN105483482A (en) * | 2015-11-27 | 2016-04-13 | 贵州航天风华精密设备有限公司 | Heat-resisting wear-resisting magnesium alloy and preparation method thereof |
| CN105839099A (en) * | 2016-05-19 | 2016-08-10 | 华南理工大学 | Chromate-free passivation treating agent for nickel-plated surface and treating process |
| CN105951078A (en) * | 2016-06-27 | 2016-09-21 | 无锡伊佩克科技有限公司 | Chromate-free passivation liquid for surface treatment of electro-galvanized steel sheet and preparing method of chromate-free passivation liquid |
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| CN102808170A (en) * | 2012-08-01 | 2012-12-05 | 天津大学 | Treating fluid for corrosion-resistant rare earth conversion film on surface of aluminum alloy, and application method thereof |
| CN105331963A (en) * | 2015-09-29 | 2016-02-17 | 安徽瑞林汽配有限公司 | Aluminum alloy curing and lubricating film and preparation method thereof |
| CN105483482A (en) * | 2015-11-27 | 2016-04-13 | 贵州航天风华精密设备有限公司 | Heat-resisting wear-resisting magnesium alloy and preparation method thereof |
| CN105839099A (en) * | 2016-05-19 | 2016-08-10 | 华南理工大学 | Chromate-free passivation treating agent for nickel-plated surface and treating process |
| CN105951078A (en) * | 2016-06-27 | 2016-09-21 | 无锡伊佩克科技有限公司 | Chromate-free passivation liquid for surface treatment of electro-galvanized steel sheet and preparing method of chromate-free passivation liquid |
| CN107164753A (en) * | 2017-05-14 | 2017-09-15 | 谢新昇 | A kind of preparation method of aqueous galvanizing inactivating liquid |
| WO2019006606A1 (en) * | 2017-07-03 | 2019-01-10 | 深圳市宏昌发科技有限公司 | Passivator, surface passivation process for metal-plated part and metal workpiece |
| CN110869530A (en) * | 2017-07-03 | 2020-03-06 | 深圳市宏昌发科技有限公司 | Passivating agent, metal plated part surface passivation treatment method and metal workpiece |
| CN110480211A (en) * | 2019-08-21 | 2019-11-22 | 上海工程技术大学 | The aluminium and aluminium alloy TIG welding wire preparation method of Re conversion film are generated by being immersed in matrix surface |
| CN110480211B (en) * | 2019-08-21 | 2021-05-11 | 上海工程技术大学 | Preparation method of TIG welding wire for aluminum and aluminum alloy capable of generating Re conversion film by soaking on surface of substrate |
| CN111575694A (en) * | 2020-06-23 | 2020-08-25 | 江门市华锐铝基板股份公司 | Preparation method of cerium-manganese conversion film |
| CN114752926A (en) * | 2022-02-18 | 2022-07-15 | 航天科工防御技术研究试验中心 | Aluminum alloy surface corrosion-resistant treatment method |
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Application publication date: 20111109 |