CN114855153B - Non-washing chromium-free treatment process before coating aluminum profile - Google Patents
Non-washing chromium-free treatment process before coating aluminum profile Download PDFInfo
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- CN114855153B CN114855153B CN202210660807.2A CN202210660807A CN114855153B CN 114855153 B CN114855153 B CN 114855153B CN 202210660807 A CN202210660807 A CN 202210660807A CN 114855153 B CN114855153 B CN 114855153B
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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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- 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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- 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
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Abstract
The invention discloses a water-free chromium-free treatment process before aluminum profile coating, which belongs to the technical field of metal surface treatment and comprises the following steps of first oil removal, second oil removal, draining, chromium-free passivation, drying and the like, wherein the oil remover 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 passivating agent 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 crosslinking agent; the degreasing agent and the chromium-free passivation agent are efficient and environment-friendly, the treatment process is simple, the stability is good, the requirements of related coating performance of aluminum profiles can be well met, a water washing process is not needed in the whole coating pretreatment process, the requirements of the number of slots of a pretreatment line body are greatly reduced, zero emission of wastewater is realized, and the method has good economical efficiency.
Description
Technical Field
The invention belongs to the technical field of metal surface treatment, and particularly relates to a water-free chromium-free treatment process before aluminum profile coating.
Background
The aluminum profile is a hot extrusion formed aluminum alloy material, and the mechanical properties and the application fields of the aluminum profile are different according to different alloy components. The aluminum profile has wide application in the fields of building doors and windows, curtain walls, indoor and outdoor decoration, building structures and the like, and the aluminum profile needs to be subjected to certain metal pretreatment before being coated, so that excellent coating binding force and corrosion resistance are ensured. The aluminum profile in the current market is generally subjected to traditional hexavalent chromium treatment and novel environment-friendly chromium-free treatment before coating, and the traditional hexavalent chromium treatment contains Cr < 6+ > cancerogenic substances and has serious harm to human bodies and the environment, so that the novel environment-friendly chromium-free treatment becomes a main trend of the prior aluminum profile 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 the chromium-free passivation agent, and few consideration is given to the optimization and improvement of the oil removal acid washing agent before chromium-free passivation and the treatment process thereof. In addition, the chromium-free passivation agents of the prior art mostly require water washing after treatment. In addition, the scheme focuses on the problem of wastewater discharge in the whole aluminum profile coating pretreatment process, but the problem of wastewater discharge is solved, the problem of the treatment is solved, the treatment is unavoidable, the water washing process is involved, and certain wastewater discharge is generated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a chromium-free treatment process before coating an aluminum profile without water washing, which can truly realize the water washing process in the whole pretreatment process of the aluminum profile before coating, has zero wastewater discharge and has good economical efficiency.
The aim of the invention can be achieved by the following technical scheme:
a water-free chromium-free treatment process before coating an aluminum profile, which comprises the following steps:
step one, adjusting a feeding frame, and fixing an aluminum profile on the feeding frame;
step two, grease on the surface of the aluminum alloy is removed for the first time, a degreasing agent is prepared, and the degreasing treatment liquid prepared by thinning the degreasing agent is used for spraying the surface of the aluminum profile;
removing grease on the surface of the aluminum alloy for the second time, and continuously flushing the surface of the aluminum profile with oil removal treatment liquid;
step four, draining;
step five, chromium-free passivation, namely adding a chromium-free passivating agent into a passivation groove, and carrying out surface passivation treatment on the aluminum profile;
and step six, drying.
Furthermore, the treatment time of the oil removal 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 ℃.
Further, the time of the draining process in the fourth step is 2-20min.
Further, in the step six, the drying is performed by hot air, the temperature is 50-100 ℃, and the time is 20-30min.
Further, the degreasing agent in the second step 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.
Further, the chromium-free passivating agent 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 crosslinking agent.
Further, the resistivity of the deionized water is greater than 4MΩ & cm, the organic acid is one 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, vinyl phosphoric acid, tartaric acid, sebacic acid, octyl phosphoric acid, salicylic acid, the fluoride is one or more of hydrofluoric acid, ammonium bifluoride, fluorozirconic acid, fluotitanic acid, fluosilicic acid and ammonium fluoride, the complexing agent is one or more of 2-phosphonic butane-1, 2, 4-tricarboxylic acid, ethylenediamine tetraacetic acid, citric acid, hydroxyethylidene diphosphonic acid and aminotrimethylene phosphonic acid, the corrosion inhibitor is one or more of monoethanolamine, diethanolamine, triethanolamine, mercaptobenzothiazole and benzotriazole, the active agent is one or more of low-foam nonionic surfactant, and the active agent is one or more of C8-C16 polyoxyethylene block aliphatic polyether, and the aliphatic polyether block or the mixture of C8-C16 aliphatic block aliphatic polyether.
Further, the resistivity of the deionized water is greater than 4MΩ & cm, the organic acid is one or more than two 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 zirconium salt main agent is one or more than two of zirconium nitrate, zirconium hydroxide and zirconium basic carbonate, the fluoride is one or more than two of hydrofluoric acid, ammonium bifluoride, fluorozirconic acid, fluorotitanic acid, fluosilicic acid and ammonium fluoride, the complexing agent is one or more than two of 2-phosphonate butane-1, 2, 4-tricarboxylic acid, ethylenediamine tetraacetic acid, citric acid, hydroxyethylidene diphosphonic acid and aminotrimethylene phosphonic acid, and the cross-linking agent is one or more than two of epoxy silane coupling agents, aminosilane coupling agents, vinyl silane coupling agents, isocyanate coupling agents, silane coupling sols and hydrosilicon.
The invention has the beneficial effects that:
1. by optimizing and improving the formula of the aluminum profile degreasing agent, the water-free process can be realized on the premise of meeting the degreasing effect, and the subsequent chromium-free passivation treatment effect can not be influenced under the water-free condition.
2. The formula of the chromium-free passivation medicament for the aluminum profile is optimized and improved, so that a water-free process is realized, the subsequent coating is not influenced under the water-free condition, the corrosion resistance of the aluminum profile can be well improved, the adhesive force of the aluminum profile and a coating is enhanced, and the related coating performance requirement of the aluminum profile is met.
3. The degreasing agent and the chromium-free passivation agent are efficient and environment-friendly, the treatment process is simple, the stability is good, the requirements of related coating performance of aluminum profiles can be well met, a water washing process is not needed in the whole coating pretreatment process, the requirements of the number of slots of a pretreatment line body are greatly reduced, zero emission of wastewater is realized, and the method has good economical efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.
Fig. 1 is a process flow diagram of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The non-chromium treatment process before water-washing aluminum profile coating, as shown in fig. 1, comprises the following steps:
step one, adjusting a feeding frame, and fixing the aluminum profile on the feeding frame.
Step two, grease on the surface of the aluminum alloy is removed for the first time, a degreasing agent is prepared, and the degreasing treatment liquid prepared by thinning the degreasing agent is used for spraying the surface of the aluminum profile; wherein 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, 0.5% of block polyether surfactant, 0.5min of treatment time and 25 ℃.
And thirdly, removing grease on the surface of the aluminum alloy for the second time, and continuously flushing the surface of the aluminum profile by using oil removal treatment liquid for 0.5min at the treatment temperature of 25 ℃.
And step four, draining, namely draining in a natural state for 2 minutes.
Step five, chromium-free passivation, namely adding a chromium-free passivating agent into a passivation groove, and carrying out surface passivation treatment on the aluminum profile; wherein the chromium-free passivating agent comprises 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, 0.5min of treatment time and 25 ℃.
And step six, drying the passivated aluminum profile, wherein the drying is performed by hot air at the temperature of 50 ℃ for 20min.
Example 2
A water-free chromium-free treatment process before coating an aluminum profile comprises the following steps:
step one, adjusting a feeding frame, and fixing the aluminum profile on the feeding frame.
Step two, grease on the surface of the aluminum alloy is removed for the first time, a degreasing agent is prepared, and the degreasing treatment liquid prepared by thinning the degreasing agent is used for spraying the surface of the aluminum profile; wherein the degreasing agent comprises, by weight, 55% of deionized water, 10% of oxalic acid, 10% of hydrofluoric acid, 5% of hydroxyethylidene diphosphonic acid, 5% of benzotriazole, 5% of block polyether surfactant, 5% of treatment time, and 25 ℃.
And thirdly, removing grease on the surface of the aluminum alloy for the second time, and continuously flushing the surface of the aluminum profile by using oil removal treatment liquid for 5min at the treatment temperature of 25 ℃.
And step four, draining, namely draining in a natural state for 11min.
Step five, chromium-free passivation, namely adding a chromium-free passivating agent into a passivation groove, and carrying out surface passivation treatment on the aluminum profile; wherein the chromium-free passivating agent comprises 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, 5% of epoxy silane coupling agent, 2.5min of treatment time and 25 ℃.
And step six, drying the passivated aluminum profile, wherein the drying is carried out by adopting hot air, the temperature is 75 ℃, and the time is 25min.
Example 3
A water-free chromium-free treatment process before coating an aluminum profile comprises the following steps:
step one, adjusting a feeding frame, and fixing the aluminum profile on the feeding frame.
Step two, grease on the surface of the aluminum alloy is removed for the first time, a degreasing agent is prepared, and the degreasing treatment liquid prepared by thinning the degreasing agent is used for spraying the surface of the aluminum profile; wherein the degreasing agent comprises 80% of deionized water, 20% of oxalic acid, 20% of hydrofluoric acid, 10% of hydroxyethylidene diphosphonic acid, 10% of benzotriazole, 10% of block polyether surfactant, 10% of treatment time and 25 ℃ of treatment temperature in parts by weight.
And thirdly, removing grease on the surface of the aluminum alloy for the second time, and continuously flushing the surface of the aluminum profile by using oil removal treatment liquid for 10min at the treatment temperature of 25 ℃.
And step four, draining, namely draining in a natural state for 20min.
Step five, chromium-free passivation, namely adding a chromium-free passivating agent into a passivation groove, and carrying out surface passivation treatment on the aluminum profile; wherein the chromium-free passivating agent 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, 10% of epoxy silane coupling agent, 5min of treatment time and 25 ℃.
And step six, drying the passivated aluminum profile, wherein the drying is performed by hot air at the temperature of 100 ℃ for 30min.
Comparative example 1
Adopts Chinese patent with the issued publication number of CN110257838B, and is an aluminum profile powder spraying pretreatment process, which comprises the following steps: s1: adjusting a 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: chromium-free passivation; s10: washing with water; s11: drying treatment, namely dripping and drying firstly, and then drying.
Performance detection
The aluminum profiles of examples 1 to 3 and comparative example 1 were subjected to film corrosion resistance and film adhesion test, and the test results are shown in table 1.
(1) The film corrosion resistance is evaluated by adopting a neutral salt spray test, the salt spray test is referred to GB/T10125-1997, the test solution is 5% (mass fraction) sodium chloride aqueous solution, the PH is controlled at 6.5-7.2, the temperature in a box is 35 ℃, continuous spraying is carried out for 72 hours, a sample plate is taken out and rinsed clean, then the quality loss is measured, and when the quality test is carried out, a protective film on the back of the sample is removed, and 1:1 (volume ratio) of hydrochloric acid solution, wherein 3.5g/L of hexamethylenetetramine corrosion inhibitor is added, a sample is soaked to remove corrosion products, then the sample is washed with water at room temperature for testing, then is washed with acetone, and is weighed after being dried;
(2) Film adhesion test-dividing method, film adhesion test is carried out according to the mode specified by GB/T9286-1998 standard, dividing method test is adopted for qualitative determination, and the film adhesion is accurately rated according to the falling-off condition of dividing areas of the film.
Table 1 aluminium profile test results
From the table, the experimental results of the embodiments 1-3 and the comparative example 1 are similar, the corrosion resistance of the aluminum profile can be effectively improved, the aluminum profile is well protected, the industrial performance requirements are met, and the pollution can be effectively reduced by adopting the water-free zero-emission process, so that the method has good economical efficiency. Meanwhile, the data in example 2 are optimal, and the scheme in example 2 is illustrated as a preferable scheme.
According to the invention, the problems and defects in practical application of the aluminum profile coating pretreatment are combined, the formulas of the aluminum profile degreasing agent and the aluminum profile chromium-free passivation agent and the whole aluminum profile coating pretreatment process are optimized and improved through full-scale consideration, and the real water-washing-free working procedure and zero wastewater discharge in the whole aluminum profile coating pretreatment process are realized on the premise of ensuring that the related coating performance requirements can be met. The chromium-free treatment agent before coating the aluminum profile without water washing is efficient and environment-friendly, the treatment process is simple, the stability is good, the coating performance of the aluminum profile can be improved well, the water washing process is not needed in the whole pretreatment process of the aluminum profile, the requirement on the number of grooves of a pretreatment line body is reduced greatly, zero emission of wastewater is realized, and the method has good economical efficiency.
The foregoing has shown and described the basic principles, principal 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, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (7)
1. The non-chromium treatment process before water-washing-free aluminum profile coating is characterized by comprising the following steps of:
step one, adjusting a feeding frame, and fixing an aluminum profile on the feeding frame;
step two, grease on the surface of the aluminum alloy is removed for the first time, a degreasing agent is prepared, and the degreasing treatment liquid prepared by thinning the degreasing agent is used for spraying the surface of the aluminum profile;
removing grease on the surface of the aluminum alloy for the second time, and continuously flushing the surface of the aluminum profile with oil removal treatment liquid;
step four, draining;
step five, chromium-free passivation, namely adding a chromium-free passivating agent into a passivation groove, and carrying out surface passivation treatment on the aluminum profile;
step six, drying;
the degreasing agent in the second step 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;
the chromium-free passivating agent 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 crosslinking agent.
2. The non-aqueous aluminum profile pre-coating chromium-free treatment process according to claim 1, wherein the treatment time of the oil removal procedure in the second and third steps is 0.5-10min, and the treatment temperature is 25 ℃.
3. The non-aqueous aluminum profile pre-coating chromium-free treatment process according to 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-aqueous aluminum profile pre-coating chromium-free treatment process according to claim 1, wherein the draining process in the fourth step is 2-20min.
5. The washing-free chromium-free treatment process before coating of the aluminum profile according to claim 1, wherein the drying in the step six adopts hot air drying, the temperature is 50-100 ℃ and the time is 20-30min.
6. The water-free chromium-free treatment process before aluminum profile coating according to claim 1, wherein the resistivity of deionized water is greater than 4MΩ & cm, the organic acid is one 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, vinyl phosphoric acid, tartaric acid, sebacic acid, octyl phosphoric acid, salicylic acid, the fluoride is one or more of hydrofluoric acid, ammonium bifluoride, fluozirconic acid, fluotitanic acid, fluosilicic acid and ammonium fluoride, the complexing agent is one or more of 2-butane-1, 2, 4-tricarboxylic acid, ethylenediamine tetraacetic acid, citric acid, hydroxyethylidene diphosphonic acid and aminotrimethylene phosphonic acid, the corrosion inhibitor is one or more of monoethanolamine, diethanolamine, triethanolamine, mercaptobenzothiazole and benzotriazole, the corrosion inhibitor is one or more of two of C-block aliphatic polyether, the activity is one or more of C-block polyether is C8-aliphatic alcohol, and the aliphatic block is a mixture of C8-aliphatic block aliphatic alcohol.
7. The water-free chromium-free treatment process before aluminum profile coating according to claim 1, wherein the resistivity of the deionized water is greater than 4mΩ & cm, the organic acid is one 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, salicylic acid, the zirconium salt main agent is one or more of zirconium nitrate, zirconium hydroxide and zirconium basic carbonate, the fluoride is one or more of hydrofluoric acid, ammonium bifluoride, fluozirconic acid, fluosilicic acid and ammonium fluoride, the complexing agent is one or more of 2-phosphonic butane-1, 2, 4-tricarboxylic acid, ethylenediamine, citric acid, hydroxyethylidene diphosphonic acid and aminomethylphosphonic acid, the crosslinking agent is one or more of epoxy silane, silane coupling agent and silane coupling agent.
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