CN114717543B - Preparation method of composition for improving salt spray resistance of coating after non-phosphorus conversion treatment of steel - Google Patents
Preparation method of composition for improving salt spray resistance of coating after non-phosphorus conversion treatment of steel Download PDFInfo
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- CN114717543B CN114717543B CN202210239853.5A CN202210239853A CN114717543B CN 114717543 B CN114717543 B CN 114717543B CN 202210239853 A CN202210239853 A CN 202210239853A CN 114717543 B CN114717543 B CN 114717543B
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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
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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
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
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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
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Abstract
The invention discloses a preparation method of a composition for increasing salt spray resistance of a coating after non-phosphorus conversion treatment of steel, which comprises the following steps: the components are as follows: s1, preparing modified tannin extract; s2, preparing a composition for improving salt spray resistance of a coating after non-phosphorus conversion treatment of steel, wherein the composition comprises the following components in parts by mass: 20-40 parts of tannin extract modifier in S1, 2-5 parts of polyhydroxy dispersion liquid, 3-8 parts of alkyl silane coupling agent, 3-8 parts of organic metal ester coupling agent and 5-15 parts of alcohol ether cosolvent, wherein the total mass of the composition is 100 parts, and the balance is deionized water. Compared with the prior art, the preparation method of the composition for increasing the salt spray resistance of the coating after the non-phosphorus conversion treatment of the steel has the following beneficial effects: the salt fog performance of the coating after the non-phosphorus conversion treatment of steel is obviously improved, the treatment liquid can remove rust and form a film, does not contain harmful substances such as phosphorus, chromium and the like, has stable chemical composition and reliable treatment quality.
Description
Technical Field
The invention relates to the technical field of surface treatment, in particular to a preparation method of a composition for improving salt spray resistance of a coating after non-phosphorus conversion treatment of steel.
Background
For a long time, the phosphating process is always the first pretreatment process in the field of steel coating, and has wide application in the aspects of automobiles, household appliances, buildings, office appliances and the like.
After the phosphating film is matched with paint, powder paint, electrophoretic paint and the like to form a coating, the requirement of corrosion resistance can be effectively met, and the corrosion resistance of the composite coating is generally evaluated by the result of a neutral salt spray test. For example, the single-side expansion of the scratch part of the composite coating formed by the phosphating film and the epoxy-polyester powder coating is less than 2mm after the scratch is subjected to a neutral salt spray test for 500 hours. However, the phosphating process contains phosphorus and heavy metals, which is harmful to the environment and human health. Therefore, in recent years, there are increasing restrictions on conventional high-pollution pretreatment processes. At present, the most mature phosphorus-free pretreatment technology replacing the phosphating technology is a zirconium/silane technology, and the coating performance of the technology is basically equivalent to that of phosphating. However, compared with phosphating, the phosphorus-free conversion film has obvious defects that the film thickness of the phosphorus-free conversion film is very thin (20 mg/square meter-200 mg/square meter), the corrosion resistance of the film layer is relatively poor, and the neutral salt fog resistance of the film layer is difficult to meet the requirement after the film layer is matched with paint, powder coating, electrophoretic coating and the like, so that the phosphorus-free conversion process is limited in the application and popularization processes.
In the prior art, the following technical problems exist: 1. the film thickness of the non-phosphorus conversion film is very thin (20 mg/square meter-200 mg/square meter), and the corrosion resistance of the film layer is relatively poor; 2. the relatively thin film layer makes it difficult to meet the requirement of neutral salt fog resistance after being matched with paint, powder coating, electrophoretic coating and the like to form a coating.
Disclosure of Invention
The invention aims to provide a preparation method of a composition for improving the salt spray resistance of a coating after non-phosphorus conversion treatment of steel, which not only has good corrosion resistance of a conversion film, but also further reduces the treatment of wastewater, and is non-phosphorus and non-chromium and environment-friendly.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
the preparation method of the composition for improving the salt spray resistance of the coating after the non-phosphorus conversion treatment of the steel comprises the following steps: the components are all in parts by mass
S1 modified tannin extract preparation
Dissolving 30 parts by mass of condensed tannin extract in 50-65 parts by mass of deionized water, filtering to remove insoluble matters, heating to about 50-90 ℃, adding 2.4-5.0 parts by mass of organic amine, slowly adding 3.0-6.0 parts by mass of formaldehyde solution, keeping the temperature for reaction for 1.5-3 hours, and supplementing water to 100 parts by mass;
s2 preparation of composition for increasing salt spray resistance of coating after non-phosphorus conversion treatment of steel
The composition comprises the following components in parts by mass: 20-40 parts of S1 tannin extract modified matter, 2-5 parts of polyhydroxy dispersion liquid, 3-8 parts of alkyl silane coupling agent, 3-8 parts of organic metal ester coupling agent and 5-15 parts of alcohol ether cosolvent, wherein the total mass part of the composition is 100 parts, and the balance is deionized water.
As a further improvement of the scheme, the organic amine in S1 is any one or more of triethanolamine, dimethylamine, hydroxyethyl ethylenediamine, acrylamide and meglumine.
As a further improvement of the scheme, the condensed tannin extract is any one or more of quebracho, bayberry, yu Gan, and acacia.
As a further improvement of the scheme, the polyhydroxy dispersion liquid is a nano silicon dioxide water dispersion liquid.
As a further improvement of the scheme, the alkyl silane coupling agent is alkyl alkoxy silane R m -Si-(OR’) n Wherein R is a straight-chain saturated alkyl group having not more than 4 carbon atoms, OR' is an ethoxy group OR a methoxy group, for example: dimethyldiethoxysilane, diethoxydimethylsilane, propyltrimethoxysilane and the like
As a further improvement of the scheme, the organic metal ester coupling agent is diisopropyl di (triethanolamine) titanate.
As a further improvement of the scheme, the alcohol ether cosolvent is lower alcohol ether of ethylene glycol and propylene glycol, such as dipropylene glycol butyl ether, dipropylene glycol methyl ether, ethylene glycol butyl ether and diethylene glycol methyl ether.
The preparation method of the composition for improving the salt spray resistance of the coating after the non-phosphorus conversion treatment of the steel has the following beneficial effects:
1) The salt spray resistance of the coating after the non-phosphorus conversion of the steel can be obviously enhanced by combining the composition with the treatment process, and the specific treatment mode can be that the coating is added into the non-phosphorus conversion treatment liquid according to a certain proportion for auxiliary treatment to form a film, or the steel is treated by the aqueous solution of the composition after the non-phosphorus conversion treatment;
2) The advantages and disadvantages of the adhesive force are greatly related to the corrosion resistance of the coated metal, the adhesive force of the coating film in a salt spray environment is improved, or the attenuation speed of the adhesive force in the salt spray environment is reduced, and the method has great significance for improving the salt spray resistance of the composite coating after the phosphorus-free conversion treatment. After the composition is used for treating the synergistic phosphorus-free conversion film, the adhesive force between the steel phosphorus-free conversion film and the coating can be improved, and the salt spray resistance of the coating can also be improved;
3) When salt fog tests are carried out, salt fog can form a salt water penetrating coating on the surface of a workpiece to reach a metal/coating interface, so that a de-bonding effect can be generated, the salt water penetrating coating diffuses at the metal/coating interface and reacts with steel to generate rust. After the composition acts, the lipophilic alkyl in the short-chain alkyl silane is doped in the composite film layer, so that the lipophilic hydrophobicity of the metal interface phosphorus-free conversion film can be increased; furthermore, the salt spray test can reduce the amount of salt water entering a metal/coating interface, and the speed of penetrating through the film to reach the metal surface is reduced after salt water solution enters the metal/coating interface;
4) Because the surface of the steel has metallographic structure defects, a complete non-phosphorus conversion film layer cannot be formed, a non-bonding area exists between the metal and the coating, the non-phosphorus conversion film is an amorphous film layer and often has defects such as cracks, and the like, the non-hydrolytic high molecular weight polymer film layer can be formed after the composition is added or used, the defects of the non-phosphorus conversion film and the non-bonding area between the metal and the coating are reduced, the saline solution is prevented from being further diffused to a metal interface to corrode the metal, and the non-hydrolytic characteristic of the composition can also avoid the film layer from being damaged by saline hydrolysis, so that the salt water resistance is improved;
5) Unlike hydrolyzed tannic acid prepared with Chinese gall and other extract, condensed tannin extract consists of condensed tannin and is complex polymer of flavanol and other compound with C-C bond as main component, and the complex polymer is difficult to decompose in water solution and has the natural macro molecule difficult to hydrolyze to form middle film between metal and coating to avoid or hinder the interface between metal and coating from being destroyed with salt water medium;
the condensed tannin and polyphenol structure can be combined with hydroxyl, carboxyl and other groups in the coating, can also be combined with metal ions, has an amphiphilic coupling effect, and provides good adhesive force for the coating and the metal matrix. However, tannin extracts are natural products, have relatively large molecular weights, and have a small proportion of water-insoluble components. The amination modification is needed to improve the water solubility and the binding capacity with metal can be improved. The modified condensed tannin is firmly combined with iron, and simultaneously plays a role in preventing corrosion of the corrosive medium to steel, and can slow down the diffusion of iron ions. Active phenolic hydroxyl groups, especially ortho-phenolic hydroxyl groups, which are not bound to groups such as hydroxyl groups in metal oxides, coatings, etc., can react preferentially with oxygen penetrating into the coating, with good oxidation resistance, up to the effect of retarding corrosion.
The condensation tannin extract is modified as follows:
6) The titanium dioxide doped film formed after the hydrolysis of the organic titanium coupling agent has excellent corrosion resistance, can fill the defect of the non-phosphorus conversion film, and simultaneously participates in forming a macromolecular polymer film layer together with the hydrolysate of the silane coupling agent to optimize the corrosion resistance of the composite film layer; the silane coupling agent and the organic metal ester coupling agent can also form cross-linking with-OH or-COOH groups in the coating, form covalent bond combination with metal, and provide excellent binding force for the metal-coating together with the synergistic tannin extract. Taking titanate as an example, the following is shown:
7) The polyhydroxy inorganic dispersoid not only can fill gaps of condensed tannins, but also can provide a large amount of hydroxyl groups, and the polyhydroxy inorganic dispersoid is combined with the modified condensed tannins to form a crosslinked polymer film. The silane coupling agent provided by the invention has C1-C4 short-chain alkyl, and is hydrolyzed to form silanol with short-chain alkyl, so that the silanol has certain hydrophobicity, and after being combined with condensed tannin, the silanol can be endowed with a composite membrane layer to prevent salt water from contacting or avoid infiltration. And part of titanate is hydrolyzed to form titanium dioxide gel, so that the film layer contains a certain amount of titanium dioxide, and the salt spray resistance of the composite film layer is improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described below with reference to examples a to f:
the preparation method of the composition for improving the salt spray resistance of the coating after the non-phosphorus conversion treatment of the steel comprises the following steps: the components are all in parts by mass
S1 modified tannin extract preparation
Dissolving 30 parts by mass of condensed tannin extract in 50-65 parts by mass of deionized water, filtering to remove insoluble matters, heating to about 50-90 ℃, adding 2.4-5.0 parts by mass of organic amine, slowly adding 3.0-6.0 parts by mass of formaldehyde solution, keeping the temperature for reaction for 1.5-3 hours, and supplementing water to 100 parts by mass;
s2 preparation of composition for increasing salt spray resistance of coating after non-phosphorus conversion treatment of steel
The composition comprises the following components in parts by mass: 20-40 parts of S1 tannin extract modified matter, 2-5 parts of polyhydroxy dispersion liquid, 3-8 parts of alkyl silane coupling agent, 3-8 parts of organic metal ester coupling agent and 5-15 parts of alcohol ether cosolvent, wherein the total mass part of the composition is 100 parts, and the balance is deionized water.
As a further improvement of the scheme, the organic amine in S1 is any one or more of triethanolamine, dimethylamine, hydroxyethyl ethylenediamine, acrylamide and meglumine.
As a further improvement of the scheme, the condensed tannin extract is any one or more of quebracho, bayberry, yu Gan, and acacia.
As a further improvement of the scheme, the polyhydroxy dispersion liquid is a nano silicon dioxide water dispersion liquid.
As a further improvement of the scheme, the alkyl silane coupling agent is alkyl alkoxy silane R m -Si-(OR’) n Wherein R is a straight-chain saturated alkyl group having not more than 4 carbon atoms, OR' is an ethoxy group OR a methoxy group, for example: dimethyldiethoxysilane, diethoxydimethylsilane, propyltrimethoxysilane and the like
As a further improvement of the scheme, the organic metal ester coupling agent is diisopropyl di (triethanolamine) titanate.
As a further improvement of the scheme, the alcohol ether cosolvent is lower alcohol ether of ethylene glycol and propylene glycol, such as dipropylene glycol butyl ether, dipropylene glycol methyl ether, ethylene glycol butyl ether and diethylene glycol methyl ether.
Example 1
S1 modified product
S2 composition
Example 2
S1
S2 composition
Example 3
S1
S2 composition
Comparative example 1
In the prior art, the phosphorus-free conversion film treatment process comprises the following steps:
1) Degreasing and deoiling: thoroughly cleaning steel with alkaline cleaning agent;
2) And (3) rinsing with water: cleaning residual cleaning agent on the surface of steel, and completely soaking the surface by water;
3) Phosphorus-free conversion film treatment: the phosphorus-free conversion aqueous solution is prepared according to the process formula in blank treatment 1 in table 1, the PH value is 3.8-4.2, the temperature is normal temperature, and the treatment time is as follows: and 1.5min, wherein the treatment mode is spraying.
4) And (3) rinsing with water: cleaning the residual treatment liquid on the surface of steel or in the gaps of structural members;
5) And (3) drying: and hot air drying at 80-120deg.C.
Comparative example 2
In the prior art, the phosphorus-free conversion film treatment process comprises the following steps:
1) Degreasing and deoiling: thoroughly cleaning steel with alkaline cleaning agent;
2) And (3) rinsing with water: cleaning residual cleaning agent on the surface of steel, and completely soaking the surface by water;
3) Phosphorus-free conversion film treatment: the phosphorus-free conversion aqueous solution is prepared according to the process formula in blank treatment 2 in Table 2, the PH value is 3.8-4.5, the temperature is normal temperature, and the treatment time is as follows: 2min, the treatment mode is soaking.
4) And (3) rinsing with water: cleaning the residual treatment liquid on the surface of steel or in the gaps of structural members;
5) And (3) drying: and hot air drying at 80-120deg.C.
Table 1: the performance of the synergistic coating of example 1 was compared to that of comparative example 1
Table 2: the properties of the coatings after the synergy treatment in examples 2 and 3 are compared with those of the coatings after the treatment in the treatment mode in comparative example 2
From the NASS test results of example 1 and comparative example blank 1 of table 1, and the NASS test results of example 2, example 3 and comparative example blank 2 of table 2, it can be seen that: after the composition is treated, the salt fog performance of the coating after the non-phosphorus conversion treatment of the steel is obviously improved, and more customer demands can be met; furthermore, the treatment fluid can remove rust and form a film, has multiple functions and wide application range, and does not contain harmful substances such as phosphorus, chromium and the like; the operation and use are simple and convenient, the application range of parameter indexes is wide, the chemical composition of the treatment fluid is stable, and the treatment quality is reliable;
after the composition is used for treating the synergistic phosphorus-free conversion film, the adhesive force between the steel phosphorus-free conversion film and the coating can be improved, and the salt spray resistance of the coating can also be improved; after the composition acts, the lipophilic alkyl in the short-chain alkyl silane is doped in the composite film layer, so that the lipophilic hydrophobicity of the metal interface phosphorus-free conversion film can be increased; furthermore, the salt spray test can reduce the amount of salt water entering a metal/coating interface, and the speed of penetrating through the film to reach the metal surface is reduced after salt water solution enters the metal/coating interface;
because the surface of the steel has metallographic structure defects, a complete non-phosphorus conversion film layer cannot be formed, a non-bonding area exists between the metal and the coating, the non-phosphorus conversion film is an amorphous film layer and often has defects such as cracks, and the like, the non-hydrolytic high molecular weight polymer film layer can be formed after the composition is added or used, the defects of the non-phosphorus conversion film and the non-bonding area between the metal and the coating are reduced, the saline solution is prevented from being further diffused to a metal interface to corrode the metal, and the non-hydrolytic characteristic of the composition can also avoid the film layer from being damaged by saline hydrolysis, so that the salt water resistance is improved;
the condensed tannin extract mainly comprises condensed tannin, and complex polycondensates formed by combining compounds such as flavanol and the like with C-C bonds as main components are difficult to decompose in aqueous solution, and an intermediate film layer between metal and a coating is generated by utilizing the natural macromolecules difficult to hydrolyze, so that the interface between the metal and the coating can be effectively prevented or hindered from being damaged by a saline water medium;
the condensed tannin and polyphenol structure can be combined with hydroxyl, carboxyl and other groups in the coating, can also be combined with metal ions, has an amphiphilic coupling effect, and provides good adhesive force for the coating and the metal matrix. However, tannin extracts are natural products, have relatively large molecular weights, and have a small proportion of water-insoluble components. The amination modification is needed to improve the water solubility and the binding capacity with metal can be improved. The modified condensed tannin is firmly combined with iron, and simultaneously plays a role in preventing corrosion of the corrosive medium to steel, and can slow down the diffusion of iron ions. Active phenolic hydroxyl groups which are not combined with hydroxyl groups in metal oxides and coatings, especially ortho-phenolic hydroxyl groups, can react with oxygen which invades the coating preferentially, and have the effects of good oxidation resistance and corrosion retardation. The synergistic composite coating subjected to the phosphorus-free conversion treatment has no adverse phenomena such as peeling and bubbling and the like in NASS test (depending on different coatings, the time is at least 500 hours or at least 1000 hours), and the single-side corrosion amount at the scratch is 1.2-1.6 mm on average; the coating of the control group has no adverse phenomena such as peeling and bubbling, the single-side corrosion amount at the scratch is 2.0-2.2 mm on average, and the salt spray resistance of the coating is effectively improved after the surface synergistic treatment.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent modifications made by the present invention are within the scope of the invention.
Claims (9)
1. The preparation method of the composition for improving the salt spray resistance of the coating after the non-phosphorus conversion treatment of the steel is characterized by comprising the following steps of: the components are all in parts by mass
S1 modified tannin extract preparation
Dissolving 30 parts by mass of condensed tannin extract in 50-65 parts by mass of deionized water, filtering to remove insoluble matters, heating to about 50-90 ℃, adding 2.4-5.0 parts by mass of organic amine, slowly adding 3.0-6.0 parts by mass of formaldehyde solution, keeping the temperature for reaction for 1.5-3 hours, and supplementing water to 100 parts by mass;
s2 preparation of composition for increasing salt spray resistance of coating after non-phosphorus conversion treatment of steel
The composition comprises the following components in parts by mass: 20-40 parts of S1 tannin extract modified matter, 2-5 parts of polyhydroxy dispersion liquid, 3-8 parts of alkyl silane coupling agent, 3-8 parts of organic metal ester coupling agent and 5-15 parts of alcohol ether cosolvent, wherein the total mass part of the composition is 100 parts, and the balance is deionized water.
2. The method for preparing the composition for increasing the salt spray resistance of the coating after the non-phosphorus conversion treatment of steel according to claim 1, wherein the organic amine in S1 is any one or more of triethanolamine, dimethylamine, hydroxyethyl ethylenediamine, acrylamide and meglumine.
3. The method for preparing the composition for increasing the salt spray resistance of the coating after the non-phosphorus conversion treatment of steel according to claim 1, wherein the condensed tannin extract is any one or more of quebracho, bayberry, yu Gan and acacia.
4. The method for preparing the composition for enhancing the salt spray resistance of the coating after the non-phosphorus conversion treatment of steel according to claim 1, wherein the polyhydroxy dispersion is a nano silica aqueous dispersion.
5. The method for preparing the composition for improving the salt spray resistance of the coating after the non-phosphorus conversion treatment of steel according to claim 1, wherein the alkylsilane coupling agent is alkylalkoxysilane R m -Si-(OR’) n Wherein R is a straight-chain saturated alkyl group with a carbon number not more than 4, and OR' is ethoxy OR methoxy.
6. The method for preparing the composition for improving the salt spray resistance of the coating after the non-phosphorus conversion treatment of steel according to claim 5, wherein the alkylsilane coupling agent is any one or more of dimethyldiethoxysilane, diethoxydimethylsilane and propyltrimethoxysilane.
7. The method for preparing the composition for increasing the salt spray resistance of the coating after the non-phosphorus conversion treatment of steel according to claim 1, wherein the organometallic ester coupling agent is diisopropyl di (triethanolamine) titanate.
8. The method for preparing the composition for enhancing the salt spray resistance of the coating after the non-phosphorus conversion treatment of steel according to claim 1, wherein the alcohol ether cosolvent is a low-carbon alcohol ether of ethylene glycol and propylene glycol.
9. The method for preparing the composition for increasing the salt spray resistance of the coating after the non-phosphorus conversion treatment of steel according to claim 8, wherein the alcohol ether cosolvent is any one or more of dipropylene glycol butyl ether, dipropylene glycol methyl ether, ethylene glycol butyl ether and diethylene glycol methyl ether.
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