CN114855153A - Washing-free chromium-free treatment process before coating of aluminum profile - Google Patents
Washing-free chromium-free treatment process before coating of aluminum profile 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
- C23C22/34—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
- C23C22/361—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 titanium, zirconium or hafnium compounds
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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
- C23C22/46—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 oxalates
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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
- C23C22/46—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 oxalates
- C23C22/47—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 oxalates containing also phosphates
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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
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/061—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors nitrogen-containing compounds
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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
- 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 washing-free chromium-free treatment process before coating of an aluminum profile, which belongs to the technical field of metal surface treatment and comprises the working procedures of first oil removal, second oil removal, draining, chromium-free passivation, drying and the like, wherein an oil removal agent comprises the following components in percentage by weight: 30-80% of deionized water, 1-20% of organic acid, 1-20% of fluoride, 1-10% of complexing agent, 0.1-10% of corrosion inhibitor and 0.5-10% of active agent, wherein the chromium-free passivator comprises the following components in percentage by weight: 30-90% of deionized water, 1-20% of organic acid, 1-20% of zirconium salt main agent, 1-10% of fluoride, 1-10% of complexing agent and 1-10% of cross-linking agent; the degreasing agent and the chromium-free passivation agent are efficient and environment-friendly, simple in treatment process and good in stability, can well meet the requirements of related coating performance of aluminum profiles, and are free of washing in the whole coating pretreatment process, the requirement of the number of grooves of a pretreatment line is greatly reduced, zero discharge of wastewater is realized, and the high-efficiency and environment-friendly aluminum profile coating has good economy.
Description
Technical Field
The invention belongs to the technical field of metal surface treatment, and particularly relates to a washing-free chromium-free treatment process before coating of an aluminum profile.
Background
The aluminum profile is an aluminum alloy material formed by hot extrusion, and the mechanical property and the application field of the aluminum profile are different according to different alloy components. The aluminum profile is widely applied to the fields of building doors and windows, curtain walls, indoor and outdoor decoration, building structures and the like, and certain metal pretreatment is required before coating, so that excellent coating binding force and corrosion resistance are ensured. Aluminum profiles on the market at present generally have traditional hexavalent chromium treatment and novel environmental protection chromium-free treatment before coating, and the traditional hexavalent chromium treatment has serious harm to human bodies and environment because of containing Cr6+ carcinogens, so the novel environmental protection chromium-free treatment becomes a main trend of the prior aluminum profile before coating treatment.
At present, the technical scheme of the chromium-free treatment before coating of the aluminum profile disclosed in the market focuses on the optimization and improvement of a chromium-free passivation medicament, and the optimization and improvement of an oil removal pickling medicament before chromium-free passivation and a treatment process thereof are rarely considered. In addition, the chromium-free passivation agents of the prior art are mostly treated and then washed with water. In addition, some schemes focus on the problem of waste water discharge in the whole process of pretreatment of aluminum profile coating, but all the schemes are temporary and permanent, and inevitably involve a washing process, so that certain waste water discharge is generated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a washing-free chromium-free treatment process before coating of an aluminum profile, which can really realize a washing-free procedure in the whole process of pretreatment before coating of the aluminum profile, has zero discharge of waste water and good economy.
The purpose of the invention can be realized by the following technical scheme:
a washing-free chromium-free treatment process before coating of an aluminum profile comprises the following steps:
step one, adjusting a feeding frame, and fixing an aluminum section on the feeding frame;
secondly, grease on the surface of the aluminum alloy is removed for the first time, a degreasing agent is prepared, and degreasing treatment liquid prepared by diluting the degreasing agent is used for spraying the surface of the aluminum alloy;
removing grease on the surface of the aluminum alloy for the second time, and continuously washing the surface of the aluminum alloy by using an oil removal treatment solution;
step four, draining;
fifthly, carrying out chromium-free passivation, namely adding a chromium-free passivator into a passivation tank to carry out surface passivation treatment on the aluminum profile;
and step six, drying.
Furthermore, the treatment time of the oil removing procedure in the second step and the third step is 0.5-10min, and the treatment temperature is 25 ℃.
Furthermore, the treatment time of the chromium-free passivation procedure in the fifth step is 0.5-5min, and the treatment temperature is 25 ℃.
Furthermore, the time of the draining process in the fourth step is 2-20 min.
Further, the drying in the sixth step adopts hot air drying, the temperature is 50-100 ℃, and the time is 20-30 min.
Further, the oil removing agent in the second step comprises the following components in percentage by weight: 30 to 80 percent of deionized water, 1 to 20 percent of organic acid, 1 to 20 percent of fluoride, 1 to 10 percent of complexing agent, 0.1 to 10 percent of corrosion inhibitor and 0.5 to 10 percent of active agent.
Further, the chromium-free passivator in the fifth step comprises the following components in percentage by weight: 30-90% of deionized water, 1-20% of organic acid, 1-20% of zirconium salt main agent, 1-10% of fluoride, 1-10% of complexing agent and 1-10% of cross-linking agent.
The resistivity of the deionized water is more than 4M omega cm, the organic acid is one or a mixture of more than two of glycolic acid, benzoic acid, methanesulfonic acid, oxalic acid, polyacrylic acid, phytic acid, tannic acid, epoxy succinic acid, polyaspartic acid, acetic acid, succinic acid, ascorbic acid, gallic acid, pyrogallic acid, lactic acid, vinylphosphoric acid, tartaric acid, sebacic acid, octylphosphoric acid and salicylic acid, the fluoride is one or a mixture of more than two of hydrofluoric acid, ammonium bifluoride, fluorozirconic acid, fluotitanic acid, fluosilicic acid and ammonium fluoride, the complexing agent is one or a mixture of more than two of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, ethylenediamine tetraacetic acid, citric acid, hydroxyethylidene diphosphonic acid and aminotrimethylene phosphonic acid, and the corrosion inhibitor is monoethanolamine, One or a mixture of more than two of diethanol amine, triethanolamine, mercaptobenzothiazole and benzotriazole, wherein the active agent is a low-foam nonionic surfactant, and specifically is one or a mixture of more than two of isomerized C8-C16 fatty alcohol polyoxyethylene ether, C8-C16 fatty alcohol block polyether and block polyether.
The deionized water has a resistivity of more than 4M omega cm, the organic acid is one or a mixture of more than two of glycolic acid, benzoic acid, methanesulfonic acid, oxalic acid, polyacrylic acid, phytic acid, tannic acid, epoxy succinic acid, polyaspartic acid, acetic acid, succinic acid, ascorbic acid, gallic acid, pyrogallic acid, lactic acid, vinylphosphoric acid, tartaric acid, sebacic acid, octylphosphoric acid and salicylic acid, the zirconium salt main agent is one or a mixture of more than two of zirconium nitrate, zirconium hydroxide and basic zirconium carbonate, the fluoride is one or a mixture of more than two of hydrofluoric acid, ammonium bifluoride, fluorozirconic acid, fluorotitanic acid, fluosilicic acid and ammonium fluoride, and the complexing agent is 2-phosphonobutane-1, 2, 4-tricarboxylic acid, ethylenediamine tetraacetic acid, citric acid, hydroxyethylidene diphosphonic acid, hydrogen diphosphonic acid, sodium hydrogen phosphate, the crosslinking agent is one or a mixture of more than two of epoxy silane coupling agent, amino silane coupling agent, vinyl silane coupling agent, isocyanate silane coupling agent, silane oligomer, silica sol and tetraethoxysilane.
The invention has the beneficial effects that:
1. by optimizing and improving the formula of the aluminum profile oil removing agent, the washing-free process can be realized on the premise of meeting the oil removing effect, and the subsequent chromium-free passivation treatment effect cannot be influenced under the washing-free condition.
2. By optimizing and improving the formula of the aluminum profile chromium-free passivation agent, the washing-free procedure is realized, the subsequent coating is not influenced under the washing-free condition, the corrosion resistance of the aluminum profile can be well improved, the adhesive force between the aluminum profile and the coating is enhanced, and the related coating performance requirements of the aluminum profile are met.
3. The degreasing agent and the chromium-free passivation agent disclosed by the invention are efficient and environment-friendly, simple in treatment process and good in stability, can well meet the requirements of related coating performance of aluminum profiles, and are free of a washing process in the whole coating pretreatment process, the requirement of reducing the number of grooves of a pretreatment line is greatly reduced, zero discharge of wastewater is realized, and the high-efficiency and environment-friendly treatment agent has good economy.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A washing-free chromium-free treatment process before coating of an aluminum profile, as shown in figure 1, comprises the following steps:
step one, adjusting a feeding frame, and fixing the aluminum section on the feeding frame.
Secondly, grease on the surface of the aluminum alloy is removed for the first time, a degreasing agent is prepared, and degreasing treatment liquid prepared by diluting the degreasing agent is used for spraying the surface of the aluminum alloy; the degreasing agent comprises 30% of deionized water, 1% of oxalic acid, 1% of hydrofluoric acid, 1% of hydroxyethylidene diphosphonic acid, 0.1% of benzotriazole and 0.5% of block polyether surfactant in parts by weight, the treatment time is 0.5min, and the treatment temperature is 25 ℃.
And step three, removing grease on the surface of the aluminum alloy for the second time, and continuously washing the surface of the aluminum alloy by using the oil removal treatment solution, wherein the treatment time is 0.5min, and the treatment temperature is 25 ℃.
And step four, draining, wherein the draining is naturally performed for 2 min.
Fifthly, carrying out chromium-free passivation, namely adding a chromium-free passivator into a passivation tank to carry out surface passivation treatment on the aluminum profile; the chromium-free passivator comprises, by weight, 30% of deionized water, 1% of polyacrylic acid, 1% of zirconium nitrate, 1% of hydrofluoric acid, 1% of 2-phosphonic butane-1, 2, 4-tricarboxylic acid, 1% of epoxy silane coupling agent, and the treatment time is 0.5min and the treatment temperature is 25 ℃.
And step six, drying the passivated aluminum profile at 50 ℃ for 20min by adopting hot air.
Example 2
A washing-free chromium-free treatment process before coating of an aluminum profile comprises the following steps:
step one, adjusting a feeding frame, and fixing the aluminum section on the feeding frame.
Secondly, grease on the surface of the aluminum alloy is removed for the first time, a degreasing agent is prepared, and degreasing treatment liquid prepared by diluting the degreasing agent is used for spraying the surface of the aluminum alloy; the degreasing agent comprises 55% of deionized water, 10% of oxalic acid, 10% of hydrofluoric acid, 5% of hydroxyethylidene diphosphonic acid, 5% of benzotriazole and 5% of block polyether surfactant in parts by weight, the treatment time is 5min, and the treatment temperature is 25 ℃.
And step three, removing grease on the surface of the aluminum alloy for the second time, and continuously washing the surface of the aluminum alloy by using the oil removal treatment solution, wherein the treatment time is 5min, and the treatment temperature is 25 ℃.
And step four, draining, wherein the draining is naturally performed for 11 min.
Fifthly, carrying out chromium-free passivation, namely adding a chromium-free passivator into a passivation tank to carry out surface passivation treatment on the aluminum profile; the chromium-free passivator comprises, by weight, 60% of deionized water, 10% of polyacrylic acid, 10% of zirconium nitrate, 5% of hydrofluoric acid, 5% of 2-phosphonic butane-1, 2, 4-tricarboxylic acid and 5% of epoxy silane coupling agent, the treatment time is 2.5min, and the treatment temperature is 25 ℃.
And step six, drying the passivated aluminum profile at 75 ℃ for 25min by adopting hot air.
Example 3
A washing-free chromium-free treatment process before coating of an aluminum profile comprises the following steps:
step one, adjusting a feeding frame, and fixing the aluminum section on the feeding frame.
Secondly, grease on the surface of the aluminum alloy is removed for the first time, a degreasing agent is prepared, and degreasing treatment liquid prepared by diluting the degreasing agent is used for spraying the surface of the aluminum alloy; the degreasing agent comprises 80% of deionized water, 20% of oxalic acid, 20% of hydrofluoric acid, 10% of hydroxyethylidene diphosphonic acid, 10% of benzotriazole and 10% of block polyether surfactant in parts by weight, the treatment time is 10min, and the treatment temperature is 25 ℃.
And step three, removing grease on the surface of the aluminum alloy for the second time, and continuously washing the surface of the aluminum alloy by using the oil removal treatment solution, wherein the treatment time is 10min, and the treatment temperature is 25 ℃.
And step four, draining, wherein the draining is naturally performed for 20 min.
Fifthly, carrying out chromium-free passivation, namely adding a chromium-free passivator into a passivation tank to carry out surface passivation treatment on the aluminum profile; the chromium-free passivator comprises 90% of deionized water, 20% of polyacrylic acid, 20% of zirconium nitrate, 10% of hydrofluoric acid, 10% of 2-phosphonic butane-1, 2, 4-tricarboxylic acid and 10% of epoxy silane coupling agent in parts by weight, the treatment time is 5min, and the treatment temperature is 25 ℃.
And step six, drying the passivated aluminum profile at 100 ℃ for 30min by adopting hot air.
Comparative example 1
The aluminum profile powder spraying pretreatment process adopts a Chinese patent with an authorization publication number of CN110257838B, and 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: carrying out light emitting 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.
Performance detection
The aluminum profiles of examples 1-3 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 of the film is evaluated by adopting 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 spraying is continuously carried out for 72 hours, a sample plate is taken out and rinsed cleanly, then the mass loss is measured, and during the quality test, a protective film on the back surface of the sample is removed, and the weight of the sample plate is measured by using a pressure meter, wherein the weight ratio of 1: 1 (volume ratio) hydrochloric acid solution, wherein 3.5g/L hexamethylenetetramine corrosion inhibitor is added, a sample is soaked to remove corrosion products, then the sample is washed by water at room temperature, then washed by acetone, dried and weighed;
(2) and (3) coating adhesion testing, namely, a grid cutting method, wherein the coating adhesion testing is carried out according to a mode specified by GB/T9286-1998 standard, the grid cutting method is adopted for testing and determining qualitatively, and the adhesion is accurately rated according to the falling condition of a cutting area of the coating.
TABLE 1 aluminum profile test results
As can be seen from the table, the experimental results of the examples 1-3 are similar to those of the comparative example 1, the corrosion resistance of the aluminum profile can be effectively improved, the aluminum profile can be well protected, the industrial performance requirements can be met, and the scheme adopts a washing-free and zero-emission process, so that the pollution can be effectively reduced, and the economic performance is good. Meanwhile, each item of data in the embodiment 2 is optimal, and the scheme in the embodiment 2 is explained as an optimal scheme.
The invention combines the problems and the defects in the practical application of the aluminum profile before-coating treatment, optimizes and improves the formula of the aluminum profile degreasing agent and the aluminum profile chromium-free passivation agent and the whole aluminum profile before-coating chromium-free treatment process by taking full consideration, and realizes the real washing-free process and the zero discharge of wastewater in the whole aluminum profile before-coating treatment process on the premise of ensuring that the requirements of related coating performance can be met. The non-chrome treatment agent before coating of the water-washing-free aluminum profile is efficient and environment-friendly, has a simple treatment process and good stability, can well improve the coating performance of the aluminum profile, is free from water-washing procedures in the whole coating pretreatment process, greatly reduces the requirement of the number of slots of a pretreatment line body, realizes zero discharge of wastewater, and has good economy.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (9)
1. The washing-free chromium-free treatment process before coating of the aluminum profile is characterized by comprising the following steps of:
step one, adjusting a feeding frame, and fixing an aluminum section on the feeding frame;
secondly, grease on the surface of the aluminum alloy is removed for the first time, a degreasing agent is prepared, and degreasing treatment liquid prepared by diluting the degreasing agent is used for spraying the surface of the aluminum alloy;
removing grease on the surface of the aluminum alloy for the second time, and continuously washing the surface of the aluminum alloy by using an oil removal treatment solution;
step four, draining;
fifthly, carrying out chromium-free passivation, namely adding a chromium-free passivator into a passivation tank to carry out surface passivation treatment on the aluminum profile;
and step six, drying.
2. The non-washing chrome-free treatment process before coating of the aluminum profile as claimed in claim 1, wherein the treatment time of the oil removing procedure in the second step and the third step is 0.5-10min, and the treatment temperature is 25 ℃.
3. The non-washing chromium-free treatment process before coating of the aluminum profile as claimed in claim 1, wherein the treatment time of the chromium-free passivation procedure in the fifth step is 0.5-5min, and the treatment temperature is 25 ℃.
4. The non-washing chromium-free treatment process before coating of the aluminum profile according to claim 1, wherein the time of the draining process in the fourth step is 2-20 min.
5. The non-washing chromium-free treatment process before coating of the aluminum profile according to claim 1, characterized in that the drying in the sixth step adopts hot air drying at the temperature of 50-100 ℃ for 20-30 min.
6. The non-washing chromium-free treatment process before coating of the aluminum profile according to claim 1, wherein the oil remover in the second step comprises the following components in percentage by weight: 30 to 80 percent of deionized water, 1 to 20 percent of organic acid, 1 to 20 percent of fluoride, 1 to 10 percent of complexing agent, 0.1 to 10 percent of corrosion inhibitor and 0.5 to 10 percent of active agent.
7. The non-washing chromium-free treatment process before coating of aluminum profile according to claim 6, wherein the resistivity of the deionized water is more than 4M Ω -cm, the organic acid is one or a mixture of two or more of glycolic acid, benzoic acid, methanesulfonic acid, oxalic acid, polyacrylic acid, phytic acid, tannic acid, epoxysuccinic acid, polyaspartic acid, acetic acid, succinic acid, ascorbic acid, gallic acid, pyrogallic acid, lactic acid, vinylphosphoric acid, tartaric acid, sebacic acid, octylphosphoric acid and salicylic acid, the fluoride is one or a mixture of two or more of hydrofluoric acid, ammonium bifluoride, fluorozirconic acid, fluotitanic acid, fluosilicic acid and ammonium fluoride, the complexing agent is 2-phosphonobutane-1, 2, 4-tricarboxylic acid, ethylenediaminetetraacetic acid, citric acid and hydroxyethylidene diphosphonic acid, The corrosion inhibitor is one or a mixture of more than two of monoethanolamine, diethanolamine, triethanolamine, mercaptobenzothiazole and benzotriazole, and the active agent is a low-foaming nonionic surfactant, specifically one or a mixture of more than two of isomerized C8-C16 fatty alcohol polyoxyethylene ether, C8-C16 fatty alcohol block polyether and block polyether.
8. The non-washing chromium-free treatment process before coating of the aluminum profile as claimed in claim 1, wherein the chromium-free passivator in the fifth step comprises the following components in percentage by weight: 30-90% of deionized water, 1-20% of organic acid, 1-20% of zirconium salt main agent, 1-10% of fluoride, 1-10% of complexing agent and 1-10% of cross-linking agent.
9. The washing-free chrome-free treatment agent before aluminum profile coating as claimed in claim 8, wherein the resistivity of the deionized water is greater than 4M Ω -cm, the organic acid is one or a mixture of two or more of glycolic acid, benzoic acid, methanesulfonic acid, oxalic acid, polyacrylic acid, phytic acid, tannic acid, epoxy succinic acid, polyaspartic acid, acetic acid, succinic acid, ascorbic acid, gallic acid, pyrogallic acid, lactic acid, vinylphosphonic acid, tartaric acid, sebacic acid, octylphosphoric acid, salicylic acid, the zirconium salt main agent is one or a mixture of two or more of zirconium nitrate, zirconium hydroxide, and zirconium basic carbonate, the fluoride is one or a mixture of two or more of hydrofluoric acid, ammonium bifluoride, fluorozirconic acid, fluotitanic acid, fluosilicic acid, and ammonium fluoride, the complexing agent is 2-phosphonobutane-1, one or a mixture of more than two of 2, 4-tricarboxylic acid, ethylene diamine tetraacetic acid, citric acid, hydroxy ethylidene diphosphonic acid and amino trimethylene phosphonic acid, wherein the cross-linking agent is one or a mixture of more than two of epoxy silane coupling agent, amino silane coupling agent, vinyl silane coupling agent, isocyanate silane coupling agent, silane oligomer, silica sol and ethyl orthosilicate.
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| CN116791072A (en) * | 2023-08-14 | 2023-09-22 | 广东宏泰节能环保工程有限公司 | Metal surface treatment passivating agent and preparation method and application thereof |
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