CN110257838B - Aluminum profile powder spraying pretreatment process - Google Patents
Aluminum profile powder spraying pretreatment process Download PDFInfo
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- CN110257838B CN110257838B CN201910589085.4A CN201910589085A CN110257838B CN 110257838 B CN110257838 B CN 110257838B CN 201910589085 A CN201910589085 A CN 201910589085A CN 110257838 B CN110257838 B CN 110257838B
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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
- C23C22/36—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 containing also phosphates
- C23C22/367—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 containing also phosphates containing alkaline earth metal cations
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/22—Light metals
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
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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
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
Abstract
The invention discloses a pretreatment process for aluminum profile powder spraying, which belongs to the field of aluminum profile surface treatment, and the technical scheme is characterized in that the pretreatment process for aluminum profile powder spraying comprises the following steps: s1: adjusting the feeding frame, and fixing the aluminum profile on the feeding frame; s2: washing with water; s3: pre-degreasing; s4: washing with water; s5: alkali washing; s6: washing with water; s7: performing light removal treatment; s8: washing with water; s9: carrying out chromium-free passivation; s10: washing with water; s11: and (4) drying, namely dripping the mixture to be dry and then drying. The effect of improving environmental protection in the surface treatment process of the aluminum profile is achieved.
Description
Technical Field
The invention relates to the field of aluminum profile surface treatment, in particular to a pretreatment process for aluminum profile powder spraying.
Background
In daily life, the application of the aluminum profile is ubiquitous, and the aluminum profile door frame and the aluminum profile are used for manufacturing a shell or parts of an electronic product. In the process of processing the aluminum profile, oil stains and the like are adhered to the surface of the aluminum profile, for example, in the process of stamping the aluminum profile in a die, the oil stains are adhered to the die, and some oil stains floating in air in a workshop are deposited on the surface of the aluminum profile, so that the aluminum profile needs to be subjected to surface treatment before processes such as paint spraying and welding, and the oil stains on the surface of the aluminum profile are removed.
In the existing aluminum profile surface treatment process, nitric acid is generally used as a main component, chromic acid and hydrofluoric acid are added to treat the surface of the aluminum profile, and although fluoride ions can accelerate dissolution of an oxide film on the surface of the aluminum profile, the hydrofluoric acid is unstable in property, and toxic gas is easily generated in bath solution to harm human health.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a pretreatment process for powder spraying of an aluminum profile, and the effect of improving the environmental protection in the surface treatment process of the aluminum profile is achieved.
The technical purpose of the invention is realized by the following technical scheme:
a pretreatment process for powder spraying of an aluminum profile comprises the following steps:
s1: adjusting the feeding frame, and fixing the aluminum profile on the feeding frame;
s2: washing with water;
s3: pre-degreasing, namely adding a degreasing agent into a degreasing tank, and hoisting the aluminum profile in the step S2 into the degreasing tank through a crane for degreasing; wherein the degreasing agent comprises 80-140 parts by weight of phosphoric acid, 40-60 parts by weight of sulfuric acid, 35-50 parts by weight of sodium gluconate, 25-55 parts by weight of dipropylene glycol, 20-40 parts by weight of ferric sulfate and 10-30 parts by weight of oxidant;
s4: washing, namely washing the aluminum profile in the step S3;
s5: alkali washing, namely adding an alkali washing agent and water into an alkali washing tank to form alkali washing liquid, and hoisting the aluminum profile in S4 into the alkali washing tank through a crane to perform alkali washing treatment; wherein the alkaline washing liquid comprises 30-50 parts by weight of sodium phosphate, 25-35 parts by weight of sodium silicate, 60-80 parts by weight of sodium hydroxide, 20-40 parts by weight of phosphoric acid and 20-40 parts by weight of sodium gluconate;
s6: washing with water;
s7: adding a light emitting agent and water into the light emitting groove to form light emitting liquid, and hoisting the aluminum profile in the S6 into the light emitting groove through a crane to perform chemical light emitting treatment; wherein, the brightening agent comprises 40 to 60 portions of citric acid, 40 to 50 portions of sodium alkyl benzene sulfonate and 30 to 60 portions of methanesulfonic acid according to the weight portion;
s8: washing with water;
s9: performing chromium-free passivation, namely adding a passivating agent into a passivation tank to perform surface passivation treatment on the aluminum profile in the S8; wherein the passivating agent comprises 50-60 parts by weight of ammonium fluotitanate, 20-40 parts by weight of nitric acid, 15-30 parts by weight of calcium carbonate, 40-50 parts by weight of organic phosphonic acid and 20-40 parts by weight of silane coupling agent;
s10: washing with water;
s11: and (4) drying, namely dripping the mixture to be dry and then drying.
Through adopting above-mentioned technical scheme, fix the aluminium alloy on the work or material rest, then hang into the washing tank in, soak the aluminium alloy surface earlier during washing for the first time, degreaser and aluminium alloy surface contact in advance when helping the pre-degreasing, after washing earlier simultaneously, will be stained with some impurity that attach on the aluminium alloy surface and remove, make things convenient for the clearance in later stage.
When the aluminum profile is degreased in advance, the phosphoric acid and the sulfuric acid can dissolve and strip a natural oxide film on the surface of the aluminum profile, and after the natural oxide film on the aluminum profile is removed, the phosphoric acid and the sulfuric acid are in contact with the surface of the aluminum profile, so that the surface of aluminum is activated, grease on the surface of the aluminum profile is removed, and meanwhile, the phosphoric acid and the sulfuric acid cannot generate acid mist in the using process, so that the environment cannot be influenced. The dipropylene glycol is easy to dissolve in water, and meanwhile, the slight toxicity does not influence human health, so that the quality of a processing environment is improved, the dipropylene glycol can reduce the surface tension of a solution, the cleaning capability of the degreasing agent and the surface of the aluminum profile in the acid etching process can be effectively improved, the stability of the degreasing liquid can be improved, and the degreasing efficiency is prevented from being influenced by floccules formed in a degreasing groove in the degreasing process. Ferric ion can accelerate the corruption and take off the oxide film to the aluminium alloy surface, and iron ion takes place the replacement reaction with the aluminium alloy surface simultaneously, can make the aluminium alloy surface produce trace hydrogen, takes the greasy dirt out of aluminium alloy surface, simultaneously because iron ion takes place the replacement reaction with aluminium, thereby generate ferrous ion, the joining of oxidant can carry out the oxidation to ferrous ion and generate ferric ion, improve ferric ion's utilization ratio, also guarantee the stability of degreaser solution simultaneously. The sodium gluconate is safe and environment-friendly, and simultaneously, the addition of the sodium gluconate can maintain the stability of the degreasing agent solution and effectively delay the time for forming flocculate in the degreasing agent solution, thereby improving the recycling efficiency of the degreasing agent.
In the alkali washing process, an oxide film on the surface of an aluminum profile can be further removed through alkali corrosion, residual partial acid liquor on the surface of the aluminum profile can be neutralized, the aluminum profile is prevented from being over-corroded, meanwhile, sodium gluconate is used as a scaling inhibitor, the phenomenon that the removed oil stain is formed into floccules and is adhered to the surface of the aluminum profile again is effectively prevented, the efficiency of cleaning the surface of the aluminum profile is improved, meanwhile, the harm of sodium phosphate, sodium silicate, sodium hydroxide, phosphoric acid and sodium gluconate to human bodies and the environment is small, and the aluminum profile cleaning agent is environment-friendly in the using process.
The micro roughness of the surface of the aluminum profile can be reduced by the light emission of the aluminum profile, the metal surface is flat and bright, meanwhile, the removal of grease on the surface of the aluminum profile can be further enhanced, the addition of citric acid is complexed with metal ions in a light-emitting groove to form a complex, the complex is beneficial to improving the stability of a light-emitting agent solution, meanwhile, the addition of citric acid can improve the solubility between sodium alkyl benzene sulfonate and grease, the degreasing capability is improved, the grease and an oxidation film on the surface of the aluminum profile are removed, so that the surface of the aluminum profile is smooth and flat, and the sodium alkyl benzene sulfonate not only has emulsifying performance, but also has certain decontamination and; the methanesulfonic acid is used as a leveling agent and a brightening agent and is corroded with the surface of the aluminum profile, so that the surface of the aluminum profile is smooth, and the light emitting efficiency is improved.
The chromium-free passivation can effectively reduce the pollution to the environment in the degreasing and alkali washing processes, iron, magnesium, silicon and other ions in the aluminum profile are insoluble in alkali liquor and can remain on the surface of the aluminum profile to form grey-black loose substances, the subsequent processing technology is influenced, spots on the surface of the aluminum profile can be effectively removed by adding nitric acid, the surface of the aluminum profile is kept consistent, ammonium fluotitanate is used for replacing chromates, the pollution to the environment can be reduced, meanwhile, the corrosion resistance and the adhesive force of a passivation film can be effectively improved, ammonium ions in the ammonium fluotitanate are also beneficial to adjusting the pH value of a passivator solution, and the stability of the solution is kept.
The silane coupling agent is added to form an organosilane film with the surface of the aluminum alloy, so that the adhesion capability and corrosion resistance of the passive film are enhanced, the silane film can improve the adhesion capability of the passive film due to the fact that a silane group and the surface of the aluminum alloy form a metal silane bond, the metal silane bond can improve the adhesive force of ammonium fluotitanate and the surface of the aluminum alloy, and meanwhile, the silane coupling agent contains a Si-O-Si network structure, so that the network structure can effectively prevent corrosive mesons from being immersed, and the aluminum alloy is protected. The organic phosphonic acid and the metal are chelated to form a protective film, and the protective film formed by chelating the organic phosphonic acid and the metal can improve the adhesion capability with the surface of the aluminum profile under the action of the silane coupling agent, so that the protection of the aluminum profile is improved. And calcium ions in the calcium carbonate react with fluoride ions to form fluoride, the fluoride ions in the passivation solution are consumed, and the stability of the low-fluorine ammonium titanate is improved, so that the deposition of titanium on the surface of the aluminum profile is accelerated, the film forming speed is reduced, the processing time is shortened, and meanwhile, the corrosion resistance of the passivation film is effectively improved due to the coexistence of nitric acid and the calcium ions.
The ammonium fluotitanate, the nitric acid, the calcium carbonate, the organic phosphonic acid and the silane coupling agent have little pollution to the environment in the using process, and the environmental protection performance in use is effectively improved.
And washing the passivated aluminum profile with water again, drying, and performing subsequent processing treatment, thereby improving the corrosion resistance of the aluminum profile.
The invention is further provided that in S2, the pre-degreasing treatment temperature is 25 ℃, and the treatment time is 8-12 min.
By adopting the technical scheme, because the pre-degreasing agent contains sulfuric acid and phosphoric acid, the time can not be overlong in the degreasing process, and the aluminum profile is prevented from being polluted excessively to influence the service performance of the aluminum profile.
The invention is further configured that in S2, the degreasing agent comprises, by weight, 110 parts of phosphoric acid, 50 parts of sulfuric acid, 42 parts of sodium gluconate, 40 parts of dipropylene glycol, 30 parts of ferric sulfate and 20 parts of an oxidizing agent.
The invention is further configured that in S2, the oxidant is at least one of hydrogen peroxide or potassium permanganate.
By adopting the technical scheme, hydrogen peroxide or potassium permanganate are both oxidants and can react with carbon-carbon bonds in the grease, so that the grease is decomposed, degreasing is facilitated, and the hydrogen peroxide and the potassium permanganate cannot influence the environment in the using process.
The invention is further set as that in S6, the aluminum section is washed twice, and the washing conditions are as follows: the water washing temperature is 25 ℃, the pH is 3-7, and the water washing mode is as follows: i.e. in and out.
The invention is further set that in S7, the light-emitting temperature is 25 ℃, the light-emitting time is 4-8min, and the concentration of the light-emitting liquid in the light-emitting groove is 3-10; the light emitting agent comprises 50 parts of citric acid, 45 parts of sodium alkyl benzene sulfonate and 45 parts of methanesulfonic acid.
The invention is further set as S8, the water washing comprises two steps, firstly the water washing is carried out, then the pure water washing is carried out, the pH value is 3-7, the temperature is 25 ℃, and the water washing mode is that the water is input and output; when pure water is used for washing, the conductivity of water is less than 50 mus/cm, the pH is more than 5, the temperature is 25 ℃, and the water is washed in and out.
Through adopting above-mentioned technical scheme, washing mainly gets rid of the light-emitting liquid who remains on the aluminium alloy surface for the first time, the processing in the later stage of being convenient for, when then carrying out pure water washing again, wash away the partial acid material who remains on the aluminium alloy surface, the passivation of the later stage of being convenient for.
The invention is further set as S9, the temperature is 25 ℃, the passivation time is 40-60S; the passivating agent comprises 55 parts of ammonium fluotitanate, 30 parts of nitric acid, 22 parts of calcium carbonate, 45 parts of organic phosphonic acid and 30 parts of silane coupling agent.
The invention further provides that, in S9, the organic phosphonic acid is amino trimethylene phosphonic acid.
By adopting the technical scheme, the amino trimethylene phosphonic acid has the structural characteristics of phosphoric acid and carboxylic acid, so that the amino trimethylene phosphonic acid has good corrosion inhibition performance, and meanwhile, a protective film formed by combining with titanium ions has excellent corrosion resistance, and the influence of an aluminum profile in the using process is effectively prevented.
The invention is further set as S11, the drying adopts hot air drying at 65-95 ℃ for 20-30 min.
In conclusion, the invention has the following beneficial effects:
1. the pre-degreasing agent, the alkali washing agent, the brightening agent and the chromium-free passivation have small pollution to the environment, and simultaneously have small harm to the human body, thereby improving the environmental protection performance of use;
2. the chromium-free passivator is used by matching ammonium fluotitanate, organic phosphoric acid, calcium carbonate and a silane coupling agent, and a passivation film formed on the surface of the aluminum profile can effectively improve the adhesive force of the film and the corrosion resistance of the film.
Detailed Description
Example 1
A pretreatment process for powder spraying of an aluminum profile comprises the following steps:
s1: adjusting the feeding frame, and fixing the aluminum profile on the feeding frame;
s2: washing with water;
s3: pre-degreasing, namely adding a degreasing agent into a degreasing tank, and hoisting the aluminum profile in the S2 into the degreasing tank through a crane at the temperature of 25 ℃ for degreasing for 8 min; the degreasing agent comprises, by weight, 80 parts of phosphoric acid, 40 parts of sulfuric acid, 35 parts of sodium gluconate, 25 parts of dipropylene glycol, 20 parts of ferric sulfate and 10 parts of hydrogen peroxide;
s4: washing, namely washing the aluminum profile in the step S3;
s5: alkali washing, namely adding an alkali washing agent and water into an alkali washing tank to form alkali washing liquid, and hoisting the aluminum profile in the S4 into the alkali washing tank through a crane at the temperature of 25 ℃ to perform alkali washing treatment for 6 min; wherein the alkaline washing solution comprises 30 parts by weight of sodium phosphate, 25 parts by weight of sodium silicate, 60 parts by weight of sodium hydroxide, 20 parts by weight of phosphoric acid and 20 parts by weight of sodium gluconate;
s6: washing, namely washing the aluminum profile twice, wherein the washing conditions are as follows: the water washing temperature is 25 ℃, the pH value is 3, and the water washing mode is as follows: the input and the output are realized;
s7: performing light emitting treatment, namely adding a light emitting agent and water into a light emitting groove to form light emitting liquid, wherein the light emitting temperature is 25 ℃, and the concentration of the light emitting liquid is 3; the aluminum profile in the S6 is hung into the light outlet groove through a crane to carry out chemical light outlet treatment, and the light outlet time is 4 min; wherein, the brightening agent comprises 40 parts of citric acid, 40 parts of sodium alkyl benzene sulfonate and 30 parts of methanesulfonic acid by weight;
s8: washing with water, wherein the washing with water comprises two steps, namely washing with water firstly and then washing with pure water, wherein the pH value of the washing with water is 3, the temperature of the washing with water is 25 ℃, and the washing with water is carried out in a mode of entering and exiting; when pure water is used for washing, the conductivity of water is less than 50 mus/cm, the pH is more than 5, the temperature is 25 ℃, and the water is washed in and out;
s9: performing chromium-free passivation, namely adding a passivating agent into a passivation tank, and performing surface passivation treatment on the aluminum profile in the S8 at the temperature of 25 ℃ for 40S; the passivating agent comprises, by weight, 50 parts of ammonium fluotitanate, 20 parts of nitric acid, 15 parts of calcium carbonate, 40 parts of amino trimethylene phosphonic acid and 20 parts of a silane coupling agent.
S10: washing with water;
s11: and (3) drying, namely dripping, drying again, and drying for 20min by adopting hot air at the temperature of 65 ℃.
Example 2
A pretreatment process for powder spraying of an aluminum profile comprises the following steps:
s1: adjusting the feeding frame, and fixing the aluminum profile on the feeding frame;
s2: washing with water;
s3: pre-degreasing, namely adding a degreasing agent into a degreasing tank, and hoisting the aluminum profile in the S2 into the degreasing tank through a crane at the temperature of 25 ℃ for degreasing for 10 min; wherein the degreasing agent comprises, by weight, 110 parts of phosphoric acid, 50 parts of sulfuric acid, 42 parts of sodium gluconate, 40 parts of dipropylene glycol, 30 parts of ferric sulfate and 20 parts of an oxidizing agent;
s4: washing, namely washing the aluminum profile in the step S3;
s5: alkali washing, namely adding an alkali washing agent and water into an alkali washing tank to form alkali washing liquid, and hoisting the aluminum profile in the S4 into the alkali washing tank through a crane at the temperature of 25 ℃ to perform alkali washing treatment for 8 min; wherein the alkaline washing solution comprises 40 parts by weight of sodium phosphate, 30 parts by weight of sodium silicate, 70 parts by weight of sodium hydroxide, 30 parts by weight of phosphoric acid and 30 parts by weight of sodium gluconate;
s6: washing, namely washing the aluminum profile twice, wherein the washing conditions are as follows: the water washing temperature is 25 ℃, the pH value is 5, and the water washing mode is as follows: the input and the output are realized;
s7: performing light emitting treatment, namely adding a light emitting agent and water into a light emitting groove to form light emitting liquid, wherein the light emitting temperature is 25 ℃, and the concentration of the light emitting liquid is 6; the aluminum profile in the S6 is hung into the light outlet groove through a crane to carry out chemical light outlet treatment, and the light outlet time is 6 min; wherein the brightening agent comprises 50 parts by weight of citric acid, 45 parts by weight of sodium alkyl benzene sulfonate and 45 parts by weight of methanesulfonic acid;
s8: washing with water, wherein the washing with water comprises two steps, namely washing with water firstly and then washing with pure water, the pH value of the washing with water is 3-7, the temperature is 25 ℃, and the washing with water is carried out in a mode of entering and exiting; when pure water is used for washing, the conductivity of water is less than 50 mus/cm, the pH is more than 5, the temperature is 25 ℃, and the water is washed in and out;
s9: performing chromium-free passivation, namely adding a passivating agent into a passivation tank, and performing surface passivation treatment on the aluminum profile in the S8 at the temperature of 25 ℃ for 50S; wherein, the passivating agent comprises 55 parts of ammonium fluotitanate, 30 parts of nitric acid, 22 parts of calcium carbonate, 45 parts of amino trimethylene phosphonic acid and 30 parts of silane coupling agent by weight;
s10: washing with water;
s11: and (3) drying, namely dripping, drying again, and drying for 25min by adopting hot air at the temperature of 80 ℃.
Example 3
A pretreatment process for powder spraying of an aluminum profile comprises the following steps:
s1: adjusting the feeding frame, and fixing the aluminum profile on the feeding frame;
s2: washing with water;
s3: pre-degreasing, namely adding a degreasing agent into a degreasing tank, and hoisting the aluminum profile in the S2 into the degreasing tank through a crane at the temperature of 25 ℃ for degreasing for 12 min; the degreasing agent comprises 140 parts by weight of phosphoric acid, 60 parts by weight of sulfuric acid, 50 parts by weight of sodium gluconate, 55 parts by weight of dipropylene glycol, 40 parts by weight of ferric sulfate and 30 parts by weight of hydrogen peroxide;
s4: washing, namely washing the aluminum profile in the step S3;
s5: alkali washing, namely adding an alkali washing agent and water into an alkali washing tank to form alkali washing liquid, and hoisting the aluminum profile in the S4 into the alkali washing tank through a crane at the temperature of 25 ℃ to perform alkali washing treatment for 10 min; wherein the alkaline washing solution comprises 50 parts by weight of sodium phosphate, 35 parts by weight of sodium silicate, 80 parts by weight of sodium hydroxide, 40 parts by weight of phosphoric acid and 40 parts by weight of sodium gluconate;
s6: washing, namely washing the aluminum profile twice, wherein the washing conditions are as follows: the water washing temperature is 25 ℃, the pH value is 7, and the water washing mode is as follows: the input and the output are realized;
s7: performing light emitting treatment, namely adding a light emitting agent and water into a light emitting groove to form light emitting liquid, wherein the light emitting temperature is 25 ℃, and the concentration of the light emitting liquid is 10; the aluminum profile in the S6 is hung into the light outlet groove through a crane to carry out chemical light outlet treatment, wherein the light outlet time is 8 min; wherein, the brightening agent comprises 60 parts of citric acid, 50 parts of sodium alkyl benzene sulfonate and 60 parts of methanesulfonic acid by weight;
s8: washing with water, wherein the washing with water comprises two steps, namely washing with water firstly and then washing with pure water, wherein the pH value of the washing with water is 7, the temperature of the washing with water is 25 ℃, and the washing with water is carried out in a mode of entering and exiting; when pure water is used for washing, the conductivity of water is less than 50 mus/cm, the pH is more than 5, the temperature is 25 ℃, and the water is washed in and out;
s9: performing chromium-free passivation, namely adding a passivating agent into a passivation tank, and performing surface passivation treatment on the aluminum profile in the S8 at the temperature of 25 ℃ for 60S; the passivating agent comprises, by weight, 60 parts of ammonium fluotitanate, 40 parts of nitric acid, 30 parts of calcium carbonate, 50 parts of amino trimethylene phosphonic acid and 40 parts of a silane coupling agent.
S10: washing with water;
s11: and (3) drying, namely dripping, drying again, and drying for 30min by adopting hot air at the temperature of 95 ℃.
Example 4
The difference from example 2 is that hydrogen peroxide was replaced by the same amount of potassium permanganate.
Comparative example 1
The method adopts a Chinese patent with an authorization publication number of CN103498180B and is named as an environment-friendly anodic oxidation pretreatment process method, and sequentially comprises the following steps: the method comprises an organic solvent oil removing step, a chemical oil removing step, a light emitting step, an alkaline etching step and a light emitting step.
Performance detection
The aluminum profiles of examples 1-4 and comparative example 1 were tested for corrosion resistance and adhesion of the coating film, and the results are shown in table 1.
(1) The corrosion resistance evaluation of the film layer adopts a neutral salt spray test, the salt spray test refers to GB/T10125-1997, a test solution is 5 percent (mass fraction) of sodium chloride aqueous solution, the pH is controlled to be 6.5-7.2, the temperature in a box is 35 ℃, the test solution is continuously sprayed for 72 hours, a sample plate is taken out and rinsed cleanly, then the mass loss is measured, during the quality test, a protective film on the back surface of the sample is removed, a 1:1 (volume ratio) hydrochloric acid solution is used, 3.5g/L of hexamethylenetetramine corrosion inhibitor is added, the sample is soaked to remove corrosion products, then the test solution is washed by water at room temperature, then the test solution is washed by acetone, and the test solution is weighed;
(2) and (3) a coating adhesion test-grid cutting method, wherein the coating adhesion test is carried out according to a mode specified by GB/T9286-1998 standard, the grid cutting method test is adopted for qualitative determination, and the adhesion is accurately rated according to the falling condition of a coating cutting area.
TABLE 1 aluminum profile test results
| Item | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 |
| Film weight (mg/m) before salt spray test2） | 42 | 50 | 45 | 49 | 32 |
| Film weight (mg/m) after salt spray test2） | 39 | 49 | 42 | 48 | 26 |
| Weight loss ratio (%) of coating film | 7.1 | 2 | 6.7 | 2 | 18.8 |
| Appearance change after salt spray test | Slight discoloration | Without change | Slight discoloration | Without change | Corrosion products appear on the surface, with slight loss of gloss |
| Grade of adhesion | Level 0 | Level 0 | Level 0 | Level 0 | Level 1 |
From the above table, it can be seen that:
the weight of the film before and after the salt spray test in examples 1-4 is higher than that of the film in comparative example 1, and the adhesion grade is also higher than that of comparative example 1, which shows that the relationship between the components and the proportion in examples 1-4 can effectively improve the corrosion resistance of the aluminum profile, and protect the aluminum profile well, and the components in examples 1-4 have little pollution to the environment and improve the environmental protection performance.
In examples 1 to 3, as can be seen from the above table, the data of each item in example 2 is the best, and the scheme in example 2 is an optimal scheme, so that the corrosion resistance of the aluminum profile can be effectively improved.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The aluminum profile powder spraying pretreatment process is characterized by comprising the following steps:
s1: adjusting the feeding frame, and fixing the aluminum profile on the feeding frame;
s2: washing with water;
s3: pre-degreasing, namely adding a degreasing agent into a degreasing tank, and hoisting the aluminum profile in the step S2 into the degreasing tank through a crane for degreasing; wherein the degreasing agent comprises 80-140 parts by weight of phosphoric acid, 40-60 parts by weight of sulfuric acid, 35-50 parts by weight of sodium gluconate, 25-55 parts by weight of dipropylene glycol, 20-40 parts by weight of ferric sulfate and 10-30 parts by weight of oxidant;
s4: washing, namely washing the aluminum profile in the step S3;
s5: alkali washing, namely adding an alkali washing agent and water into an alkali washing tank to form alkali washing liquid, and hoisting the aluminum profile in S4 into the alkali washing tank through a crane to perform alkali washing treatment; wherein the alkaline washing liquid comprises 30-50 parts by weight of sodium phosphate, 25-35 parts by weight of sodium silicate, 60-80 parts by weight of sodium hydroxide, 20-40 parts by weight of phosphoric acid and 20-40 parts by weight of sodium gluconate;
s6: washing with water;
s7: adding a light emitting agent and water into the light emitting groove to form light emitting liquid, and hoisting the aluminum profile in the S6 into the light emitting groove through a crane to perform chemical light emitting treatment; wherein, the brightening agent comprises 40 to 60 portions of citric acid, 40 to 50 portions of sodium alkyl benzene sulfonate and 30 to 60 portions of methanesulfonic acid according to the weight portion;
s8: washing with water;
s9: performing chromium-free passivation, namely adding a passivating agent into a passivation tank to perform surface passivation treatment on the aluminum profile in the S8; wherein the passivating agent comprises 50-60 parts by weight of ammonium fluotitanate, 20-40 parts by weight of nitric acid, 15-30 parts by weight of calcium carbonate, 40-50 parts by weight of organic phosphonic acid and 20-40 parts by weight of silane coupling agent;
s10: washing with water;
s11: and (4) drying, namely dripping the mixture to be dry and then drying.
2. The aluminum profile powder spraying pretreatment process according to claim 1, which is characterized in that: in S2, the pre-degreasing treatment temperature is 25 ℃, and the treatment time is 8-12 min.
3. The aluminum profile powder spraying pretreatment process according to claim 1, which is characterized in that: in S2, the degreasing agent comprises, by weight, 110 parts of phosphoric acid, 50 parts of sulfuric acid, 42 parts of sodium gluconate, 40 parts of dipropylene glycol, 30 parts of ferric sulfate and 20 parts of an oxidizing agent.
4. The aluminum profile powder spraying pretreatment process according to claim 1, which is characterized in that: in S2, the oxidant is at least one of hydrogen peroxide or potassium permanganate.
5. The aluminum profile powder spraying pretreatment process according to claim 1, which is characterized in that: in S6, the aluminum section is washed twice, and the washing conditions are as follows: the water washing temperature is 25 ℃, the pH value is 3-7, and the water washing mode is as follows: i.e. in and out.
6. The aluminum profile powder spraying pretreatment process according to claim 1, which is characterized in that: in S7, the light emitting temperature is 25 ℃, the light emitting time is 4-8min, and the concentration of the light emitting liquid in the light emitting groove is 3-10; the light emitting agent comprises 50 parts of citric acid, 45 parts of sodium alkyl benzene sulfonate and 45 parts of methanesulfonic acid.
7. The aluminum profile powder spraying pretreatment process according to claim 1, which is characterized in that: s8, washing with water comprises two steps, namely washing with water firstly and then washing with pure water, wherein the pH value is 3-7, the temperature is 25 ℃, and the washing mode is that the water enters and exits; when pure water is used for washing, the conductivity of water is less than 50 mus/cm, the pH is more than 5, the temperature is 25 ℃, and the water is washed in and out.
8. The aluminum profile powder spraying pretreatment process according to claim 1, which is characterized in that: s9, performing chromium-free passivation at the temperature of 25 ℃ for 40-60S; the passivating agent comprises 55 parts of ammonium fluotitanate, 30 parts of nitric acid, 22 parts of calcium carbonate, 45 parts of organic phosphonic acid and 30 parts of silane coupling agent.
9. The aluminum profile powder spraying pretreatment process according to claim 1, which is characterized in that: in S9, the organic phosphonic acid is amino trimethylene phosphonic acid.
10. The aluminum profile powder spraying pretreatment process according to claim 1, which is characterized in that: s11, drying by adopting hot air at the temperature of 65-95 ℃ for 20-30 min.
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| CN103498180A (en) * | 2013-08-23 | 2014-01-08 | 北京星航机电装备有限公司 | Environment-friendly anodic oxidation pretreatment process |
| CN105463429A (en) * | 2015-12-10 | 2016-04-06 | 太仓贝斯特机械设备有限公司 | Passivation method for aluminum material |
| CN107805835A (en) * | 2017-10-19 | 2018-03-16 | 江苏百舸有色金属工业科技有限公司 | Aluminium section bar Coloured Anodizing technique |
| CN109338351A (en) * | 2018-09-10 | 2019-02-15 | 佛山市保利来建材实业有限公司 | A kind of aluminum veneer Chrome-free pre-treating technology |
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| AU2003265019B2 (en) * | 2002-09-09 | 2008-08-14 | Keronite International Limited | Surface treatment of magnesium and its alloys |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103498180A (en) * | 2013-08-23 | 2014-01-08 | 北京星航机电装备有限公司 | Environment-friendly anodic oxidation pretreatment process |
| CN105463429A (en) * | 2015-12-10 | 2016-04-06 | 太仓贝斯特机械设备有限公司 | Passivation method for aluminum material |
| CN107805835A (en) * | 2017-10-19 | 2018-03-16 | 江苏百舸有色金属工业科技有限公司 | Aluminium section bar Coloured Anodizing technique |
| CN109338351A (en) * | 2018-09-10 | 2019-02-15 | 佛山市保利来建材实业有限公司 | A kind of aluminum veneer Chrome-free pre-treating technology |
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