CN104630756A - Method for forming high-thermal-conducting hydrophilic nano ceramic film on surface of aluminum - Google Patents
Method for forming high-thermal-conducting hydrophilic nano ceramic film on surface of aluminum Download PDFInfo
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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
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
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Abstract
The invention relates to a method for forming a high-thermal-conducting hydrophilic nano ceramic film on the surface of aluminum. The method is characterized in that the high-thermal-conducting hydrophilic nano ceramic film is obtained by effectively regulating and controlling the contents of an oxidizing agent, an activating agent, a pH regulating agent and an additive in a chemical oxidizing solution, the oxidizing temperature and the oxidizing time in the chemical oxidizing process. The hydrophilic nano ceramic film with a thickness of 0.01-100mu m can be formed on the surface of aluminum. The contact angle between the hydrophilic nano ceramic film and water is 0-30 degrees, the thermal conductivity of the hydrophilic nano ceramic film is 0.1-50W/(m.K) and is much higher than that of the traditional organic hydrophilic coating, and the temperature resistance of the hydrophilic nano ceramic film is good. The hydrophilic nano ceramic film can resist the high temperature of 600 DEG C, can retard flame, can be firmly combined with the substrate of aluminum, can not peel off even if being cleaned ultrasonically for 30 minutes and is improved in applicability greatly.
Description
Technical field
The present invention relates to the method that a kind of aluminium surface forms ceramic membrane, particularly relate to a kind of method forming high heat conduction hydrophilic ceramic membrane on aluminium surface.
Background technology
During heat exchanger of air condition work, can because water vapour be formed " water bridge " in the condensation of fin surface, the therefore flowing of impact heat transfer and air.Meanwhile, fin, in life-time service process, can be formed " white powder " because of corroding, its life-span is affected.For solving the problem of " water bridge " and " white powder ", hydrophilic treatment is carried out to fin surface, fin surface is generated there is hydrophilic etching resistant film, the water droplet of condensation is spread rapidly on surface, forms very thin moisture film, avoid the formation of " water bridge ", reduce windage, and anti-oxidation, increase heat exchange area, accelerate cooling and warming speed, also effectively avoid water of condensation to hinder air flowing and the noise that produces.
Fin hydrophilic aluminium foil requires that its top coat wetting ability is high, strong adhesion, corrosion stability are high, heat impedance good and good processing forming etc.Hydrophilic coating mainly contains three large series: organic hydrophilic coating, organo-mineral complexing hydrophilic coating and inorganic hydrophilic coating, what use was more at present is organic hydrophilic coating.Its hydrophilicity of organic hydrophilic coating to depend in hydrophilic resin-the hydrophilic functional groups such as OH base ,-NH2 base ,-COOH base.When being coated with hydrophilic resin, mostly add a small amount of interfacial agent, to improve hydrophilic effect.The advantage of resin hydrophilic coating is: grinding tool wear rate is low, is destitute of smell during operation of air conditioner, and shortcoming is that corrosion stability is lower, and during with copper pipe soldering, heating panel end fin surface can yellowing.Organo-mineral complexing hydrophilic coating is made up of hydrophilic resin and a small amount of silicate or solubility silica gel, wetting ability, the solidity to corrosion and odorless etc. of this coating film forming provide primarily of organic high molecular compound, silicate/the silica gel added can further improve its wetting ability or regulates its hardness, but the silicate in coating causes film to send the stink of seemingly mud.The hydrophilic film low price of conventional inorganic, the good hydrophilic property of film, but film anti-corrosion, odorless is poor, and adds mould easy to wear in man-hour.
Summary of the invention
Object of the present invention is exactly to solve the above-mentioned problems in the prior art, provides a kind of method forming high heat conduction hydrophilic ceramic membrane on aluminium surface
Object of the present invention is achieved through the following technical solutions:
Form the method for high heat conduction hydrophilic ceramic membrane on aluminium surface, it comprises the following steps: 1. step, carries out oil removing operation to aluminium surface, namely with the grease of alkaline degreasing solution removing metallic aluminum surface.2., acid etching operation, namely with zone of oxidation and the residual alkaline degreasing solution of acid solution removing metallic aluminum surface for step.3., chemical oxidation operation, namely uses the oxidation solution of certain proportioning to step, promotes that metallic aluminum surface generates hydrophilic nano ceramic membrane.4., drying process, namely takes out the sample after chemical oxidation to step, after deionized water rinses, carry out drying, finally forms high heat conduction hydrophilic ceramic membrane on aluminium surface.
The above-mentioned method forming high heat conduction hydrophilic ceramic membrane on aluminium surface, wherein: described alkaline degreasing solution is by alkali lye 20 to 50g/L, phosphoric acid salt 15 to 25g/L, silicate 3 to 5g/L, carbonate 1 to 2g/L forms, wherein, described alkali lye is potassium hydroxide, sodium hydroxide, calcium hydroxide, one or more in hydrated barta, described phosphoric acid salt is potassiumphosphate, potassium hydrogen phosphate, sodium phosphate, one or more in sodium hydrogen phosphate, described silicate is potassium silicate, one or more in water glass, described carbonate is sodium carbonate, salt of wormwood, saleratus, one or more in sodium bicarbonate.
Further, the above-mentioned method forming high heat conduction hydrophilic ceramic membrane on aluminium surface, wherein: in described oil removing operation, the treatment temp of employing is 50 to 80 DEG C, and the treatment time is 5 to 10min.
Further, the above-mentioned method forming high heat conduction hydrophilic ceramic membrane on aluminium surface, wherein: in described acid etching operation, acid solution is strong acid, and consumption is 100 to 150 g/L, and temperature is 30 to 40 DEG C, and the time is 2 to 5min.
Further, the above-mentioned method forming high heat conduction hydrophilic ceramic membrane on aluminium surface, wherein: described strong acid is one or more in nitric acid, sulfuric acid, hydrochloric acid, metaphosphoric acid.
Further, the above-mentioned method forming high heat conduction hydrophilic ceramic membrane on aluminium surface, wherein: in described chemical oxidation operation, the proportioning of oxidation solution is, oxygenant 0.25 to 0.85g/L, activator 0.15 to 0.25g/L, solution PH conditioning agent 0.025 to 0.05 g/L, auxiliary agent 0.005 to 0.01 g/L form.
Again further, the above-mentioned method forming high heat conduction hydrophilic ceramic membrane on aluminium surface, wherein: described oxygenant is hydrogen peroxide, Peracetic Acid, ammonium persulphate, clorox, SPC-D, one or more in potassium per(oxy)borate, described activator is Sodium Silicofluoride, ammonium sulfate, ammonium chloride, ferrous sulfate, one or more in ammonium hydroxide, described solution PH conditioning agent is sodium hydroxide, potassium hydroxide, hydrated barta, nitric acid, sulfuric acid, boric acid, one or more in phosphoric acid, described auxiliary agent is sodium apolate, sodium polyacrylate (salt), 1, 5-naphthalene disulfonic acid disodium salt hydrate, 2, 6-dinitrobenzene-4-trifluoromethyl benzene sulfonic acid sodium salt, 4-chloro-1-hydroxy-butan sodium sulfonate, 2-mercaptobenzimidazole-5-sodium sulfonate dihydrate, N, N-Methyl disulfide is for methane amide propane sulfonic acid sodium, poly-fennel sodium sulfonate, one or more combinations in 2-N-methyl-p-nitroaniline-4-sulfonate sodium.
The advantage of technical solution of the present invention is mainly reflected in: be applicable to aluminium, aluminium alloy and correlated product.Can form thickness on aluminium surface is the high heat conduction hydrophilic ceramic membrane of 0.01 to 100 μm, and is 0 to 30o with the contact angle of water.Further, the ceramic membrane thermal conductivity of employing is 0.1-50 W/ (mK), and far above traditional organic hydrophilic coating, temperature tolerance is strong.Meanwhile, they can resistance to 600 degree of high temperature, fire-retardant, and are combined firmly with aluminium substrate, even if adopt 30 minutes ultrasonic cleaning also not come off, greatly improve applicability.Like this, space has been expanded in the technical progress for this area, and implementation result is good.
Object of the present invention, advantage and disadvantage, make an explanation the non-limitative illustration by preferred embodiment below.These embodiments are only the prominent examples of application technical solution of the present invention, allly take equivalent replacement or equivalent transformation and the technical scheme that formed, all drop within the scope of protection of present invention.
Embodiment
Form the method for high heat conduction hydrophilic ceramic membrane on aluminium surface, its special feature is to comprise the following steps: first, carries out oil removing operation to aluminium surface, namely with the grease of alkaline degreasing solution removing metallic aluminum surface.Afterwards, carry out acid etching operation, namely with zone of oxidation and the residual alkaline degreasing solution of acid solution removing metallic aluminum surface.Then, carry out chemical oxidation operation, namely use the oxidation solution of certain proportioning, promote that metallic aluminum surface generates hydrophilic nano ceramic membrane.Afterwards, enter drying process, namely take out the sample after chemical oxidation, after deionized water rinses, carry out drying.Finally, high heat conduction hydrophilic ceramic membrane is formed on aluminium surface.Specifically, oxygenant mainly promotes the growth of nano ceramics film, thinks that oxidant concentration is too high, and reaction is violent, and film forming is fast, and membrane-coating granules is thick, poor adhesive force, and concentration is too low, and rete is thin even can not film forming.The effect of activator makes aluminium surface in film process, constantly dissolved, in nano ceramics film, form hole, ensure the continuous growth of nano ceramics film, thicken, excessive concentration, the too fast film that aluminium surface is formed of dissolution rate is more loose, inadequate dense uniform.PH conditioning agent stabilizing solution potential of hydrogen, controls chemical reaction rate.
With regard to the present invention one preferably embodiment, in order to effectively superficial stain can be removed, especially greasy dirt, the alkaline degreasing solution ratio adopted is as follows, and it adopts alkali lye 20 to 50g/L, phosphoric acid salt 15 to 25g/L, silicate 3 to 5g/L, carbonate 1 to 2g/L form.Specifically, for the ease of preparation, meet the needs of different environment for use, alkali lye is one or more in potassium hydroxide, sodium hydroxide, calcium hydroxide, hydrated barta.Corresponding with it, phosphoric acid salt is one or more in potassiumphosphate, potassium hydrogen phosphate, sodium phosphate, sodium hydrogen phosphate.Meanwhile, silicate is one or more in potassium silicate, water glass.Further, described carbonate is one or more in sodium carbonate, salt of wormwood, saleratus, sodium bicarbonate.When reality is implemented, consider and can play preferably deoiling effect, in oil removing operation, the treatment temp of employing is 50 to 80 DEG C, and the treatment time is 5 to 10min, can ensure noresidue.
Further, meet follow-up processing request after considering acid etching, in acid etching operation, acid solution is strong acid, and its consumption is 100 to 150 g/L, and temperature is 30 to 40 DEG C, and the time is 2 to 5min.Further, for the ease of preparation, reduce tooling cost as far as possible, also can meet the processing needs of different acid etching degree simultaneously, strong acid is one or more in nitric acid, sulfuric acid, hydrochloric acid, metaphosphoric acid.
Again further, in order to carry out appropriateness oxidation, be convenient to the shaping complete of follow-up water nano ceramics film, in chemical oxidation operation, the proportioning of oxidation solution is: oxygenant 0.25 to 0.85g/L, activator 0.15 to 0.25g/L, solution PH conditioning agent 0.025 to 0.05 g/L, auxiliary agent 0.005 to 0.01 g/L form.In conjunction with actual preparation, consider the replaceability of raw material, oxygenant is one or more in hydrogen peroxide, Peracetic Acid, ammonium persulphate, clorox, SPC-D, potassium per(oxy)borate.Meanwhile, activator is one or more in Sodium Silicofluoride, ammonium sulfate, ammonium chloride, ferrous sulfate, ammonium hydroxide.Further, effectively regulate as required to play PH numerical value, solution PH conditioning agent is one or more in sodium hydroxide, potassium hydroxide, hydrated barta, nitric acid, sulfuric acid, boric acid, phosphoric acid.Moreover, consider that the user demand of different auxiliary agent is different, the auxiliary agent that the present invention adopts in preparation process is sodium apolate, sodium polyacrylate (salt), 1,5-naphthalene disulfonic acid disodium salt hydrate, 2,6-dinitrobenzene-4-trifluoromethyl benzene sulfonic acid sodium salt, 4-chloro-1-hydroxy-butan sodium sulfonate, 2-mercaptobenzimidazole-5-sodium sulfonate dihydrate, N, N-Methyl disulfide are for one or more combinations in methane amide propane sulfonic acid sodium, poly-fennel sodium sulfonate, 2-N-methyl-p-nitroaniline-4-sulfonate sodium.
Specifically, the auxiliary agent that the present invention adopts is one or more in azochlorosulfonate acid compound, and azochlorosulfonate acid compound is a kind of water-soluble polymers with unique effect, and the sulfonic acid group on macromolecular chain makes it have very strong infiltration dissemination.Thus, oxygenant, activator, PH conditioning agent can be made to disperse uniformly with solution.Further, why adopt the reason of azochlorosulfonate acid compound to be, it is water-soluble makes it have certain regulating effect to the viscosity of chemical oxidation liquid, can reduce solution mobility.As can be seen here, oxygenant can be made, activator is dispersed in metallic aluminum surface, make metallic aluminum surface fully contact with chemical oxidation solution simultaneously, thus promote the homoepitaxial of nano ceramic film.Appropriate sulfonated bodies can make the interfacial state between aluminium surface and chemical oxidation liquid occur significantly to change, by affine respectively for two-phase of different piece in molecule, two-phase is made all to be regarded as the composition of this phase, because two-phase is all regarded as a component of this phase, just be equivalent to two and all do not form interface with surfactant molecule, just be equivalent to the elimination of the part in this way interface of two phases, just reduce surface tension and surface free energy, it effectively raises the wetting ability of nano ceramics film.
Further, consider different oxidizing process demands, in chemical oxidation operation, the oxidization time of employing is 5 to 10min, and oxidizing temperature is 50 to 90 DEG C.Further, in order to play necessary drying, ensureing in drying process, carrying out drying by being positioned in baking oven, and drying temperature being 90-110 DEG C.Certainly, by finding after multiple comparison test, drying temperature is 100 DEG C can play preferably effect.
" embodiment one "
Form the method for high heat conduction hydrophilic ceramic membrane on aluminium surface, its processing mode is as follows: first, carries out oil removing operation to aluminium surface, namely with the grease of alkaline degreasing solution removing metallic aluminum surface.Afterwards, carry out acid etching operation, namely with zone of oxidation and the residual alkaline degreasing solution of acid solution removing metallic aluminum surface.Then, carry out chemical oxidation operation, namely use the oxidation solution of certain proportioning, promote that metallic aluminum surface generates hydrophilic nano ceramic membrane.Afterwards, enter drying process, namely take out the sample after chemical oxidation, after deionized water rinses, carry out drying.Finally, high heat conduction hydrophilic ceramic membrane is formed on aluminium surface.
Specifically, the alkaline degreasing solution ratio that the present embodiment adopts is as follows, and it adopts alkali lye to be 20 g/L, phosphoric acid salt 15 g/L, and silicate 3 g/L, carbonate 1 g/L form.Meanwhile, alkali lye is potassium hydroxide, and phosphoric acid salt is potassiumphosphate, and silicate is potassium silicate, and carbonate is sodium carbonate.In oil removing operation, the treatment temp of employing is 50 DEG C, and the treatment time is 5min.
Meanwhile, in acid etching operation, acid solution is strong acid, and its consumption is 100 g/L, temperature be 30 to DEG C, the time is 2 min.Further, for the ease of preparation, strong acid is nitric acid.
In order to carry out appropriateness oxidation, in chemical oxidation operation, the proportioning of oxidation solution is: oxygenant 0.25 g/L, activator 0.15 g/L, solution PH conditioning agent 0.025 g/L, and auxiliary agent 0.005 g/L forms.In conjunction with actual preparation, consider the replaceability of raw material, oxygenant is hydrogen peroxide, and activator is Sodium Silicofluoride.Further, solution PH conditioning agent is sodium hydroxide, the auxiliary agent of employing be sodium apolate.
Further, consider different oxidizing process demands, in chemical oxidation operation, the oxidization time of employing is 5min, and oxidizing temperature is 50 DEG C.Carry out drying by being positioned in baking oven, and drying temperature is 90 DEG C.
" embodiment two "
Form the method for high heat conduction hydrophilic ceramic membrane on aluminium surface, its processing mode is as follows: first, carries out oil removing operation to aluminium surface, namely with the grease of alkaline degreasing solution removing metallic aluminum surface.Afterwards, carry out acid etching operation, namely with zone of oxidation and the residual alkaline degreasing solution of acid solution removing metallic aluminum surface.Then, carry out chemical oxidation operation, namely use the oxidation solution of certain proportioning, promote that metallic aluminum surface generates hydrophilic nano ceramic membrane.Afterwards, enter drying process, namely take out the sample after chemical oxidation, after deionized water rinses, carry out drying.Finally, high heat conduction hydrophilic ceramic membrane is formed on aluminium surface.
Specifically, the alkaline degreasing solution ratio that the present embodiment adopts is as follows, and it adopts alkali lye to be 50 g/L, phosphoric acid salt 25 g/L, silicate 5g/L, and carbonate 2 g/L forms.Meanwhile, alkali lye is sodium hydroxide, and phosphoric acid salt is potassium hydrogen phosphate, and silicate is water glass, and carbonate is saleratus.In oil removing operation, the treatment temp of employing is 80 DEG C, and the treatment time is 10min.
Meanwhile, in acid etching operation, acid solution is strong acid, and its consumption is 150 g/L, temperature be 40 to DEG C, the time is 5 min.Further, for the ease of preparation, strong acid is sulfuric acid.
In order to carry out appropriateness oxidation, in chemical oxidation operation, the proportioning of oxidation solution is: oxygenant 0.85 g/L, activator 0.25 g/L, solution PH conditioning agent 0.05 g/L, and auxiliary agent 0.01 g/L forms.In conjunction with actual preparation, consider the replaceability of raw material, oxygenant is Peracetic Acid, and activator is ammonium chloride.Further, solution PH conditioning agent is hydrated barta, and the auxiliary agent of employing is 1,5-naphthalene disulfonic acid disodium salt hydrate.
Further, consider different oxidizing process demands, in chemical oxidation operation, the oxidization time of employing is 10min, and oxidizing temperature is 90 DEG C.Carry out drying by being positioned in baking oven, and drying temperature is 110 DEG C.
" embodiment three "
Form the method for high heat conduction hydrophilic ceramic membrane on aluminium surface, the processing mode adopted is as follows: first, carries out oil removing operation to aluminium surface, namely with the grease of alkaline degreasing solution removing metallic aluminum surface.Afterwards, carry out acid etching operation, namely with zone of oxidation and the residual alkaline degreasing solution of acid solution removing metallic aluminum surface.Then, carry out chemical oxidation operation, namely use the oxidation solution of certain proportioning, promote that metallic aluminum surface generates hydrophilic nano ceramic membrane.Afterwards, enter drying process, namely take out the sample after chemical oxidation, after deionized water rinses, carry out drying.Finally, high heat conduction hydrophilic ceramic membrane is formed on aluminium surface.
Specifically, the alkaline degreasing solution ratio that the present embodiment adopts is as follows, and it adopts alkali lye to be 30 g/L, phosphoric acid salt 20 g/L, silicate 4g/L, and carbonate 1.5 g/L forms.Meanwhile, alkali lye is calcium hydroxide, and phosphoric acid salt is sodium phosphate, and silicate is water glass, and carbonate is water glass.In oil removing operation, the treatment temp of employing is 70 DEG C, and the treatment time is 9min.
Meanwhile, in acid etching operation, acid solution is strong acid, and its consumption is 120 g/L, temperature be 35 to DEG C, the time is 4 min.Further, for the ease of preparation, strong acid is hydrochloric acid.
In order to carry out appropriateness oxidation, in chemical oxidation operation, the proportioning of oxidation solution is: oxygenant 0.7 g/L, activator 0.2 g/L, solution PH conditioning agent 0.03 g/L, and auxiliary agent 0.009 g/L forms.In conjunction with actual preparation, consider the replaceability of raw material, oxygenant is ammonium persulphate, and activator is ferrous sulfate.Further, solution PH conditioning agent is nitric acid, and the auxiliary agent of employing is poly-fennel sodium sulfonate.
Further, consider different oxidizing process demands, in chemical oxidation operation, the oxidization time of employing is 8min, and oxidizing temperature is 60 DEG C.Carry out drying by being positioned in baking oven, and drying temperature is 100 DEG C.
Can be found out by above-mentioned character express, adopt after the present invention, can to form thickness on aluminium surface be the high heat conduction hydrophilic ceramic membrane of 0.01 to 100 μm, and be 0 to 30o with the contact angle of water.Further, the ceramic membrane thermal conductivity of employing is 0.1-50 W/ (mK), and far above traditional organic hydrophilic coating, temperature tolerance is strong.Meanwhile, they can resistance to 800 degree of high temperature, fire-retardant, and are combined firmly with aluminium substrate, even if adopt 30 minutes ultrasonic cleaning also not come off, greatly improve applicability.
What is more important, the high heat conduction hydrophilic ceramic membrane thickness that oxygenant, activator, PH conditioning agent, auxiliary agent content and oxidizing temperature, time in chemical oxidation solution obtains can be regulated and controled in chemical oxidation operation even by method of the present invention, wetting ability is strong, strong adhesion and solidity to corrosion strong.
Claims (9)
1. form the method for high heat conduction hydrophilic ceramic membrane on aluminium surface, it is characterized in that comprising the following steps:
1. step, carries out oil removing operation to aluminium surface, namely with the grease of alkaline degreasing solution removing metallic aluminum surface;
2., acid etching operation, namely with zone of oxidation and the residual alkaline degreasing solution of acid solution removing metallic aluminum surface for step;
3., chemical oxidation operation, namely uses the oxidation solution of certain proportioning to step, promotes that metallic aluminum surface generates hydrophilic nano ceramic membrane;
4., drying process, namely takes out the sample after chemical oxidation to step, after deionized water rinses, carry out drying, finally forms high heat conduction hydrophilic ceramic membrane on aluminium surface.
2. the method forming high heat conduction hydrophilic ceramic membrane on aluminium surface according to claim 1, it is characterized in that: described alkaline degreasing solution is by alkali lye 20 to 50g/L, phosphoric acid salt 15 to 25g/L, silicate 3 to 5g/L, carbonate 1 to 2g/L forms, wherein, described alkali lye is potassium hydroxide, sodium hydroxide, calcium hydroxide, one or more in hydrated barta, described phosphoric acid salt is potassiumphosphate, potassium hydrogen phosphate, sodium phosphate, one or more in sodium hydrogen phosphate, described silicate is potassium silicate, one or more in water glass, described carbonate is sodium carbonate, salt of wormwood, saleratus, one or more in sodium bicarbonate.
3. the method forming high heat conduction hydrophilic ceramic membrane on aluminium surface according to claim 1, it is characterized in that: in described oil removing operation, the treatment temp of employing is 50 to 80 DEG C, and the treatment time is 5 to 10min.
4. the method forming high heat conduction hydrophilic ceramic membrane on aluminium surface according to claim 1, it is characterized in that: in described acid etching operation, acid solution is strong acid, and consumption is 100 to 150 g/L, and temperature is 30 to 40 DEG C, and the time is 2 to 5min.
5. according to claim 4ly form the method for high heat conduction hydrophilic ceramic membrane on aluminium surface, it is characterized in that: described strong acid is one or more in nitric acid, sulfuric acid, hydrochloric acid, metaphosphoric acid.
6. the method forming high heat conduction hydrophilic ceramic membrane on aluminium surface according to claim 1, it is characterized in that: in described chemical oxidation operation, the proportioning of oxidation solution is, oxygenant 0.25 to 0.85g/L, activator 0.15 to 0.25g/L, solution PH conditioning agent 0.025 to 0.05 g/L, auxiliary agent 0.005 to 0.01 g/L form.
7. the method forming high heat conduction hydrophilic ceramic membrane on aluminium surface according to claim 6, it is characterized in that: described oxygenant is hydrogen peroxide, Peracetic Acid, ammonium persulphate, clorox, SPC-D, one or more in potassium per(oxy)borate, described activator is Sodium Silicofluoride, ammonium sulfate, ammonium chloride, ferrous sulfate, one or more in ammonium hydroxide, described solution PH conditioning agent is sodium hydroxide, potassium hydroxide, hydrated barta, nitric acid, sulfuric acid, boric acid, one or more in phosphoric acid, described auxiliary agent is sodium apolate, sodium polyacrylate (salt), 1, 5-naphthalene disulfonic acid disodium salt hydrate, 2, 6-dinitrobenzene-4-trifluoromethyl benzene sulfonic acid sodium salt, 4-chloro-1-hydroxy-butan sodium sulfonate, 2-mercaptobenzimidazole-5-sodium sulfonate dihydrate, N, N-Methyl disulfide is for methane amide propane sulfonic acid sodium, poly-fennel sodium sulfonate, one or more combinations in 2-N-methyl-p-nitroaniline-4-sulfonate sodium.
8. the method forming high heat conduction hydrophilic ceramic membrane on aluminium surface according to claim 1, it is characterized in that: in described chemical oxidation operation, the oxidization time of employing is 5 to 10min, and oxidizing temperature is 50 to 90 DEG C.
9. the method forming high heat conduction hydrophilic ceramic membrane on aluminium surface according to claim 1, it is characterized in that: in described drying process, be positioned in baking oven and carry out drying, and drying temperature is 90-110 DEG C.
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Cited By (2)
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| CN105624759A (en) * | 2015-12-30 | 2016-06-01 | 苏州容电储能科技有限公司 | Ceramic membrane with capillary structure and super dehumidifying and wetting performance and preparation method thereof |
| KR102101180B1 (en) * | 2019-09-06 | 2020-04-16 | 농업회사법인(유)부령산업 | Treatment Method of Aluminum Dust using Oxidizing Agent and Solidifying Agent |
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| CN104178773A (en) * | 2014-08-20 | 2014-12-03 | 山东宝龙达实业集团有限公司 | Chromium-free environmental-friendly silicon-contained aluminum and aluminum alloy surface treating agent and preparation method thereof |
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| CN1124303A (en) * | 1994-03-24 | 1996-06-12 | 日本帕卡濑精株式会社 | Aqueous composition and solution and process for metallic surface-treating an aluminum-containing metal material |
| JPH08144063A (en) * | 1994-11-22 | 1996-06-04 | Matsufumi Takatani | Surface treatment of aluminum based metallic material |
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| CN105624759A (en) * | 2015-12-30 | 2016-06-01 | 苏州容电储能科技有限公司 | Ceramic membrane with capillary structure and super dehumidifying and wetting performance and preparation method thereof |
| CN105624759B (en) * | 2015-12-30 | 2018-02-16 | 苏州容电储能科技有限公司 | Ceramic membrane with capillary structure and super dehumidifier wetting property and preparation method thereof |
| KR102101180B1 (en) * | 2019-09-06 | 2020-04-16 | 농업회사법인(유)부령산업 | Treatment Method of Aluminum Dust using Oxidizing Agent and Solidifying Agent |
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| CN104630756B (en) | 2017-04-05 |
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