KR102237993B1 - Method for surface treatment of galvanized metal for surface coloring, surface repairing and improving corrosion resistance - Google Patents

Abstract

The present invention relates to a surface treatment method for metal plated with zinc for surface coloring, surface repairing, and corrosion resistance improvement. More specifically, the present invention provides the surface treatment method which treats the surface of the metal plated with zinc with CR-free surface treatment composition comprising: a binder composition which includes ethyl silicate, hydrochloric acid, ethanol, isopropyl alcohol, methoxy silane compound, and deionized water; a coloring dye; and a coloring paint. The present invention is able to improve the resistance to corrosion, darkening, white color rust, and rust of the metal plated with zinc, to give various colors to the surface of metal plated with zinc, and to repair the surface of the metal plated with zinc. In addition, the present invention provides the surface treatment method for the metal plated with zinc by using the Cr-free surface treatment composition which further comprises a zinc flake and realizes more excellent surface repair characteristics and resistance to corrosion, darkening, white color rust, and rust.

Description

Surface treatment method of galvanized metal to improve surface coloring, surface repair and corrosion resistance {METHOD FOR SURFACE TREATMENT OF GALVANIZED METAL FOR SURFACE COLORING, SURFACE REPAIRING AND IMPROVING CORROSION RESISTANCE}

The present invention relates to a method for treating a surface of a galvanized metal for improving surface coloring, surface repair and corrosion resistance.

Specifically, the present invention relates to a method of improving the surface coloring, surface repair, and corrosion resistance of the galvanized metal by treating the surface of a galvanized metal with a chromium-free surface treatment composition in which the use of chromium is excluded.

The galvanized metal is zinc-plated on the surface of an iron material, and its main purpose is to improve durability and life by preventing oxidation of iron. The galvanized metal is used as a material for various devices such as road structures such as guard rails, traffic lights, street lights, and overpasses, ship structures, and automobiles.

In general, to prevent corrosion on the surface of galvanized metal, chromate treatment is performed. In the chromate treatment, a liquid containing chromic acid is treated on the galvanized metal, and a chromate film is formed on the galvanized surface. , It refers to a treatment method that improves the gloss of the surface while improving the corrosion resistance. Such chromate treatment is low in cost and excellent in the degree of improvement in corrosion resistance and gloss of galvanized metal, and thus is mainly used for surface treatment of galvanized metal.

For example, in Korean Patent Registration No. 10-0405908, in order to improve the corrosion resistance and fuel resistance of a galvanized steel sheet, a galvanized steel sheet is added to an aqueous solution of chromium with a composition ratio of 3 carchrome of 0.4 to 0.8 in phosphoric acid, hydrofluoric acid, and colo. This month, a method of treating with a solution containing a main solution prepared by adding silica, sulfuric acid, and sodium phosphate, and a curing agent solution is disclosed.

Meanwhile, the chromate treatment has the advantage of improving the corrosion resistance and gloss of the galvanized metal, but there is a problem in that a large amount ^{of hexavalent chromium (Cr 6+ ), which is an environmentally harmful substance, is discharged during the chromate treatment.} In addition, the conventional chromate treatment is only possible to improve the glossiness of the galvanized metal, but does not realize the effect of imparting various colors of the galvanized surface. In particular, as galvanized metal is used as a material for various devices that require aesthetic appearance, such as road structures such as guard rails, traffic lights, street lights, and overpasses, ship structures, automobiles, etc., there have been cases where it is required to implement various colors. , There was a problem that it was difficult to implement various colors with the existing chromate treatment.

Recently, in order to replace the use of chromium, a method of preventing surface corrosion of galvanized metals has been developed by forming a film on the surface of galvanized using polymers, molybdenum anions, silica, and bicarbonate. For example, in Korean Patent Application Laid-Open No. 10-2011-0049462, a coating layer is formed with a transparent resin of poly-ethylene-based, poly-urethane-based, poly-acrylic-based or poly-alkyd-based on the surface of galvanized metal, and galvanized. It is improving the corrosion resistance of the metal.

However, the coating or film formed of the conventional chromium-free surface treatment composition has low adhesion to zinc plating, and has a lower effect of improving the corrosion resistance, blackening resistance, white rust resistance, and rust resistance of the galvanized metal compared to the conventional chromate treatment. There was a problem. In addition, the effect of imparting various colors to the surface of the galvanized metal has not yet been realized.

On the other hand, galvanized metals are aged due to factors such as moisture, oxygen, temperature, etc., causing discoloration on the surface, and deteriorating durability, corrosion resistance, etc., but conventional chromium-free surface treatment compositions are the first to be galvanized. It is mainly used for securing corrosion resistance by forming a coating film on its surface during the manufacture of metal, and it is used for recoloring the already discolored galvanized surface and restoring its corrosion resistance at the same time. There were difficulties.

Therefore, by replacing the existing chromate treatment, it is possible to secure the corrosion resistance of the galvanized metal at a level similar or improved to that of the chromate treatment, while providing various colors to the surface of the galvanized metal. There is a need to develop a method for treating galvanized metal that can repair the surface by solving the discoloration of the surface of the metal and the decrease in corrosion resistance.

Korean Patent Registration No. 10-0405908 Republic of Korea Patent Publication No. 10-2011-0049462

An object of the present invention is to improve the corrosion resistance, blackening resistance, white rust resistance, rust resistance, etc. of the galvanized metal while replacing the chromate treatment, as well as giving various colors to the surface of the galvanized metal and repairing the surface at the same time. It is to provide a method for surface treatment of galvanized metal, which can be done.

The object of the present invention is not limited to the above-described technical problem, and another technical problem may be derived from the following description.

In order to achieve the above object, the present invention comprises the steps of: (a) arranging a zinc-plated metal surface; (b) a binder composition containing ethyl silicate, hydrochloric acid, ethanol, isopropyl alcohol, a methoxy silane compound, and deionized water; Coloring dyes; And a coloring pigment; preparing a chromium-free surface treatment composition by mixing; And (c) applying the chromium-free surface treatment composition to the surface of the galvanized metal and then curing it.

The step (a) includes the steps of (a-1) removing foreign substances from the zinc-plated metal surface; (a-2) washing the surface of the galvanized metal; And (a-3) applying a primer to the surface of the galvanized metal and then curing it.

The chrome-free surface treatment composition may include 0.1 to 20 parts by weight of the colored dye and 0.1 to 20 parts by weight of the colored pigment based on 100 parts by weight of the binder composition.

The binder composition includes 45 to 60% by weight of ethyl silicate, 0.1 to 4% by weight of hydrochloric acid, 10 to 25% by weight of ethanol, 2 to 7% by weight of isopropyl alcohol, and 5 to 15 of methoxy silane compounds based on the total weight of the binder composition. It may contain 10 to 20% by weight and 10 to 20% by weight of deionized water.

The methoxy silane-based compound may include glycidoxypropyltrimethoxysilane and methyltrimethoxysilane.

The methoxy silane-based compound may include glycidoxypropyltrimethoxysilane and methyltrimethoxysilane in a weight ratio of 1: 0.5 to 2.

The colored dye is one selected from the group consisting of azo dyes, anthraquinone dyes, xanthene dyes, triarylmethane dyes, phthalocyanine dyes, quinone imine dyes, quinoline dyes, nitro dyes and methine dyes. It may include more than one.

The colored pigment may include one or more selected from the group consisting of inorganic pigments and organic pigments.

The chrome-free surface treatment composition may further include zinc flakes.

The zinc flake may be further included in an amount of 10 to 40 parts by weight based on 100 parts by weight of the binder composition.

The zinc flake may have a length: 18 to 25 micrometers and an average particle diameter (D50): 15 to 20 micrometers.

Applying the chrome-free surface treatment composition to the surface of the galvanized metal in step (c) may be carried out by any one method selected from the group consisting of coating, immersion, dip spin and spray spray.

In the step (c), the chromium-free surface treatment composition may be cured at room temperature for 3 to 30 minutes.

According to the present invention, it is possible to significantly improve the corrosion resistance, blackening resistance, white rust resistance, rust resistance, etc. of the galvanized metal by replacing the existing chromate treatment, and it is possible to impart various colors to the surface of the galvanized metal. .

In addition, according to the present invention, it is applied to both the newly manufactured galvanized metal and the previously used galvanized metal, so that various colors can be given to the surface while improving the corrosion resistance of the galvanized metal. In particular, conventionally, there was a difficulty in solving the problems of surface discoloration and corrosion resistance of galvanized metals that have been used, but in the case of the present invention, a chromium-free surface treatment composition is applied to the surface of galvanized metal. Even with a simple process, it is possible to improve the corrosion resistance again while imparting various colors to the surface. That is, by solving the problems of surface discoloration and corrosion resistance of the galvanized metal that have been used, and improving surface coloring and corrosion resistance, it is possible to repair the surface of the galvanized metal.

In addition, as described above, the existing galvanized metal surface can be repaired in a short time with a simple process, which can be economical.

In addition, the chromium-free surface treatment composition according to the present invention may further improve properties such as surface repair properties, durability, and corrosion resistance by further comprising zinc flakes. In addition, flaky zinc flakes supplement zinc lost due to corrosion and prevent the penetration of corrosion factors from the outside while improving the compactness of the structure, thereby improving properties such as surface repair, durability, and corrosion resistance. It can be further improved.

In addition, since the chromium-free surface treatment composition according to the present invention can be cured at room temperature, a separate high-temperature heat treatment for curing the chromium-free surface treatment composition is unnecessary, and thus it can be economical.

In addition, the chromium-free surface treatment composition according to the present invention does not contain harmful organic solvents such as xylene and methyl ethyl ketone, and contains six heavy metals such as cadmium, mercury, lead, hexavalent chromium, polybrominated biphenyl, and polyvinyl bromide. As a result of not doing so, it may be environmentally friendly and have low human health hazards.

1 is a view showing a (A) hot-dip galvanized steel sheet surface-treated with the composition of Example 2.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts not related to the description are omitted in order to clearly describe the present invention.

The terms or words used in the specification and claims of the present invention are not limited to a conventional or dictionary meaning, and the inventor can appropriately define the concept of terms in order to describe his own invention in the best way. Based on the principle, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention.

Throughout the specification of the present invention, when a certain part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. .

In the entire specification of the present invention, "A and/or B" means A or B, or A and B.

Hereinafter, the present invention has been described in detail, but the present invention is not limited thereto.

The present invention provides a method for treating a surface of a galvanized metal for improving surface coloring and corrosion resistance.

In one embodiment of the present invention, a method of treating a galvanized metal surface with a chrome-free surface treatment composition for improving surface coloring and corrosion resistance, the method comprising: (a) arranging the zinc-plated metal surface; (b) a binder composition containing ethyl silicate, hydrochloric acid, ethanol, isopropyl alcohol, a methoxy silane compound, and deionized water; Coloring dyes; And a coloring pigment; preparing a chromium-free surface treatment composition by mixing; And (c) applying the chromium-free surface treatment composition to the surface of the galvanized metal and then curing it. Specifically, the present embodiment provides a surface treatment method for realizing a surface coloring effect while improving the corrosion resistance of a hot-dip galvanized metal.

According to this embodiment, it is possible to significantly improve the corrosion resistance, blackening resistance, white rust resistance, rust resistance, etc. of the galvanized metal by replacing the existing chromate treatment, as well as giving various colors to the surface of the galvanized metal. have.

In addition, the surface treatment method of the present embodiment may be applicable to all of the newly manufactured galvanized metal; and conventional galvanized metal such as road structures such as guardrails, traffic lights, street lights, overpasses, ship structures, automobiles, etc.; have. In particular, conventionally, when problems of discoloration of the surface of the galvanized metal due to aging and deterioration of corrosion resistance occur, repair of the aging galvanized metal was performed by replacing all or part of the galvanized metal with a new one. , According to the present embodiment, it is possible to improve corrosion resistance while imparting various colors to the surface within a short time through a simple process, so that the surface can be easily repaired.

(a) cleaning the zinc-plated metal surface

In step (a) of the present embodiment, the galvanized metal surface may be arranged so that the chromium-free surface treatment composition prepared according to step (b) below can be uniformly applied or applied to the galvanized metal surface. . In step (a) of the present embodiment, all known methods of arranging the galvanized metal surface may be performed.For example, in step (a) of this embodiment, foreign matter removal, high-pressure water spraying, surface grinding, and primer application And the like may be implemented, but is not limited thereto.

The galvanized metal may mean a hot-dip galvanized metal or an electro-galvanized metal. Preferably, the galvanized metal may be a hot-dip galvanized metal.

Specifically, step (a) of the present embodiment includes the steps of (a-1) removing foreign substances on the surface of the galvanized metal, (a-2) cleaning the surface of the galvanized metal, and (a-3) The step of curing after applying the primer to the galvanized metal surface may be further included, but is not limited thereto.

In the step of (a-1) removing foreign substances on the surface of the galvanized metal, foreign substances on a portion to which the chrome-free surface treatment composition is to be applied may be removed with a scraper or brush. In addition, in step (a-1) of the present embodiment, the zinc-plated metal is coated with the scraper, brush, etc. to remove foreign substances on the surface of the galvanized metal and prevent dust and dust from being blown off, while improving the efficiency of removing foreign substances. Water can be sprayed or sprayed on the metal surface.

In the step (a-2) of washing the zinc-plated metal surface, by spraying or spraying high-pressure water, washing water, water, etc. on the galvanized metal surface from which foreign substances have been removed in the step (a-1), cleaning is performed. You can do it. As a result, foreign substances and fine dust, etc. that were not removed in the step (a-1) may be removed from the galvanized metal surface. In addition, in step (a-2) of the present embodiment, after washing is performed by spraying or spraying high-pressure water, washing water, water, etc. on the galvanized metal surface from which foreign substances have been removed in step (a-1), the zinc A process of drying the plated metal surface may be further performed. In this case, the drying may be performed by spraying high-pressure air onto the galvanized metal surface, but is not limited thereto.

In the step of (a-3) applying a primer to the zinc-plated metal surface and then curing, a primer is applied to the surface of the galvanized metal arranged according to steps (a-1) and (a-2). After curing, the primer layer can be further formed. The primer layer may further improve adhesion between the surface of the galvanized metal and the surface treatment composition while making the surface of the galvanized metal uniform and smooth.

In this case, any known primer composition may be applied as the primer.

( b) a binder composition containing ethyl silicate, hydrochloric acid, ethanol, isopropyl alcohol, a methoxy silane compound, and deionized water; Coloring dyes; And a coloring pigment; preparing a chromium-free surface treatment composition

In step (b) of the present embodiment, a binder composition comprising ethyl silicate, hydrochloric acid, ethanol, isopropyl alcohol, a methoxy silane compound, and deionized water; Coloring dyes; And a colored pigment; it can be prepared by mixing the chromium-free surface treatment composition. Specifically, in step (b) of the present embodiment, after preparing a binder composition including ethyl silicate, hydrochloric acid, ethanol, isopropyl alcohol, methoxy silane-based compound, and deionized water, the binder composition may contain a colored dye; And colored pigments; by adding and mixing, a chromium-free surface treatment composition can be prepared. At this time, in order to perform mixing, stirring may be performed at 100 to 1000 rpm, specifically 200 to 900 rpm, and more specifically 250 to 600 rpm.

The coating film formed of the chromium-free surface treatment composition according to the present embodiment may have excellent adhesion to the galvanized surface. In addition, the coating film formed of the chromium-free surface treatment composition according to the present embodiment may have excellent adhesion to another coating film formed on the coating film formed of the chromium-free surface treatment composition. In this case, the other coating film may mean that it is formed of a composition for another use or purpose in addition to the coating film formed of the chromium-free surface treatment composition.

In addition, the chromium-free surface treatment composition according to the present embodiment can impart various colors to the surface of the galvanized metal, thereby improving the aesthetics of the object to which the galvanized metal is applied.

In addition, since the chromium-free surface treatment composition according to the present embodiment can be cured at room temperature, it may have excellent usability.

The chromium-free surface treatment composition of this embodiment includes a binder composition containing ethyl silicate, hydrochloric acid, ethanol, isopropyl alcohol, a methoxy silane compound, and deionized water.

Ethyl silicate imparts strong caking properties to sand or refractories, and precipitates silica from the solution as it is dried. Ethyl silicate is also called ethyl silicate, and its molecular formula is Si(OC ₂ H ₅ ) ₄ . In addition, ethyl silicate can improve the adhesion between the surface of the galvanized metal and the coating film formed using the chromium-free surface treatment composition of this embodiment, as well as improve corrosion resistance, blackening resistance, white rust resistance, rust resistance, and the like.

In more detail, the ethyl silicate of the present embodiment is hydrolyzed in the chromium-free surface treatment composition of the present embodiment to form a polysilicate, thereby increasing the compactness of the structure. In addition, by forming a zinc-silicon bond at the interface between the galvanized metal and the coating film formed using the chromium-free surface treatment composition of this embodiment, between the galvanized metal and the coating film formed using the chromium-free surface treatment composition of this embodiment. It can improve adhesion.

The binder composition of this embodiment may contain 45 to 60% by weight of ethyl silicate, preferably 47 to 55% by weight, and more preferably 50 to 52% by weight, based on the total weight.

If the amount of ethyl silicate is less than 45% by weight based on the total weight of the binder composition of this embodiment, the adhesion between the surface of the galvanized metal and the coating film formed using the binder composition of this embodiment is lowered, corrosion resistance, There may be a problem that blackening resistance, white rust resistance, and rust resistance are deteriorated. On the other hand, when containing more than 60% by weight of ethyl silicate based on the total weight of the binder composition of the present embodiment, there may be a problem that cracks and breakages of the coating film formed of the binder composition of the present embodiment are easily generated.

Hydrochloric acid can act as a catalyst to accelerate the hydrolysis of ethyl silicate. The binder composition of this embodiment may contain hydrochloric acid in an amount of 0.1 to 4% by weight, preferably 0.5 to 2% by weight, more preferably 0.7 to 1.5% by weight, based on the total weight.

If, based on the total weight of the binder composition of the present embodiment, hydrochloric acid is included in an amount of less than 0.1% by weight, the hydrolysis time of ethyl silicate increases, and the degree of hydrolysis is insufficient, so adhesion, corrosion resistance, blackening resistance, There may be a problem in that properties such as white rust resistance and rust resistance are deteriorated. On the other hand, in the case of containing more than 4% by weight of hydrochloric acid based on the total weight of the binder composition of the present embodiment, the pH of the binder composition of the present embodiment is rapidly lowered, thereby deteriorating formulation stability, storage stability, and usability, as well as galvanizing. There may be a problem that promotes corrosion of the metal.

Ethanol may play a role in controlling the flowability and viscosity of the binder composition of the present embodiment. In addition, a coating film having a uniform thickness and an even surface can be formed on the surface of the galvanized metal.

The binder composition of this embodiment may contain 10 to 25% by weight of ethanol, preferably 15 to 22% by weight, and more preferably 17 to 20% by weight, based on the total weight.

If the amount of ethanol is less than 10% by weight based on the total weight of the binder composition of this example, the viscosity of the binder composition of this example increases, the flowability decreases, the thickness of the coating film becomes thicker, and the cracking of the coating film. And there may be a problem that breakage easily occurs. On the other hand, when containing more than 25% by weight of ethanol based on the total weight of the binder composition of this example, the content of ethyl silicate in the binder composition of this example is relatively reduced, so that adhesion, corrosion resistance, blackening resistance, white rust resistance, rust resistance, etc. There may be a problem with this deterioration.

Isopropyl alcohol may serve to improve the stability of the binder composition of the present embodiment and to control flowability and viscosity. The binder composition of this embodiment may contain 2 to 7% by weight, preferably 3 to 6% by weight, and more preferably 4 to 5% by weight of isopropyl alcohol based on the total weight.

If the binder composition of the present embodiment contains less than 2% by weight of isopropyl alcohol based on the total weight, the stability and flowability of the binder composition of the present embodiment may decrease, and viscosity may increase. On the other hand, when the binder composition of this example contains more than 7% by weight of isopropyl alcohol based on the total weight, as the content of ethyl silicate in the binder composition of this example is relatively reduced, adhesion, corrosion resistance, and blackening resistance , There may be a problem that the white rust resistance, rust resistance, etc. are deteriorated.

The methoxy silane-based compound may include glycidoxypropyltrimethoxysilane and methyltrimethoxysilane.

The glycidoxypropyltrimethoxysilane improves adhesion and adhesion of the coating film formed using the binder composition of the present embodiment, and prevents excessive increase in viscosity, thereby improving flowability. . The methyltrimethoxysilane may improve the water resistance of the coating film formed by using the binder composition of the present embodiment. In addition, by making the coating film hydrophobic, it is possible to have a self-cleaning effect from an external contaminant.

Preferably, in this embodiment, when the glycidoxypropyltrimethoxysilane and methyltrimethoxysilane are included in a weight ratio of 1: 0.5 to 2 as a methoxy silane compound, more excellent adhesion, corrosion resistance, and blackening resistance , White rust resistance, may have properties such as rust resistance.

More preferably, the methoxy silane-based compound of the present embodiment may include the glycidoxypropyltrimethoxysilane and methyltrimethoxysilane in a weight ratio of 1: 1.25. In particular, when the methoxy silane compound of this embodiment contains the glycidoxypropyltrimethoxysilane and methyltrimethoxysilane in a weight ratio of 1: 1.25, remarkably excellent adhesion, corrosion resistance, blackening resistance, white rust resistance, It may have properties such as rust prevention.

The binder composition of the present embodiment may include 5 to 15% by weight, preferably 7 to 13% by weight, and more preferably 9 to 10% by weight of the methoxy silane compound based on the total weight.

If, based on the total weight of the binder composition of the present embodiment, the methoxy silane compound is included in an amount of less than 5% by weight, adhesion, adhesion, and flow properties are deteriorated, and water resistance and hydrophobicity are not sufficiently improved, so self-cleaning ability. There may be a problem with this deterioration. On the other hand, when containing more than 15% by weight of the methoxysilane-based compound based on the total weight of the binder composition of the present embodiment, the effect of improving adhesion and adhesion is insignificant, and there is a problem that cracks and breakage of the coating film are easily generated. In addition, there may be a problem in that the stability is deteriorated due to the precipitation of white powder on the surface of the coating film.

Deionized water serves to aid in the hydrolysis of ethyl silicate. As ethyl silicate is hydrolyzed by deionized water to form polysilicate, it may have the same effect as described above.

The binder composition of this embodiment may contain 10 to 20% by weight, preferably 12 to 17% by weight, and more preferably 14 to 15% by weight of deionized water based on the total weight.

If the amount of deionized water is less than 10% by weight based on the total weight of the binder composition of the present embodiment, as the ethyl silicate is not sufficiently hydrolyzed, adhesion, corrosion resistance, blackening resistance, white rust resistance, rust resistance, There may be a problem of deteriorating stability, etc. On the other hand, when the amount of deionized water exceeds 20% by weight based on the total weight of the binder composition of the present embodiment, the stability of the chromium-free surface treatment composition according to the present embodiment may be deteriorated, and there may be a problem that deterioration occurs. .

The chromium-free surface treatment composition of this embodiment contains a colored dye.

The colored dye serves to impart various colors to the chromium-free surface treatment composition of the present embodiment and a coating film formed using the same. Particularly, the chromium-free surface treatment composition of the present embodiment includes the above-described binder composition and a colored dye together, so that stable color can be realized by the colored dye.

The colored dye is one selected from the group consisting of azo dyes, anthraquinone dyes, xanthene dyes, triarylmethane dyes, phthalocyanine dyes, quinone imine dyes, quinoline dyes, nitro dyes and methine dyes. It may include the above, but is not limited thereto.

The azo dyes, anthraquinone dyes, xanthene dyes, triarylmethane dyes, phthalocyanine dyes, quinone imine dyes, quinoline dyes, nitro dyes and methine dyes are all known types of Dyes can be used.

For example, the azo dye, anthraquinone dye, xanthene dye, triarylmethane dye, phthalocyanine dye, quinone imine dye, quinoline dye, nitro dye and methine dye include the following The same color index (CI) name may be used, but is not limited thereto.

The azo dyes are CI Acid Yellow 11, CI Acid Orange 7, CI Acid Red 37, CI Acid Red 180, CI Acid Blue 29, CI Solvent Red 89, CI Direct Red 28, CI Direct Red 83, CI Direct Yellow 12, CI Direct Orange 26, CI Direct Green 28, CI Direct Green 59, CI Reactive Yellow 2, CI Reactive Red 17, CI Reactive Red 120, CI Disperse Orange 5, CI Disperse Red 58, CI Disperse Blue 165 , CI Basic Blue 41, CI Basic Red 18, CI Mordant Red 7, CI Mordant Yellow 5, C.1. Acid Yellow 21, CI It may include at least one selected from the group consisting of acid blue 70 and C.I. acid black 27, but is not limited thereto.

The anthraquinone dyes are CI Bat Blue 4, CI Acid Blue 40, CI Acid Green 25, CI Reactive Blue 19, CI Reactive Blue 49, CI Disperse Red 60, CI Disperse Blue 56, CI Disperse Blue 60 And one or more selected from the group consisting of CI solvent red 127, but is not limited thereto.

The xanthene-based dye may include at least one selected from the group consisting of C.I. basic red 1, C.I. basic red 1:1, C.I. basic violet 10, and C.I. solvent red 49, but is not limited thereto.

The triarylmethane-based dye may include one or more selected from the group consisting of C.I. basic blue 7 and C.I. basic blue 11, but is not limited thereto.

The phthalocyanine-based dye may include C.I. pad blue 5, but is not limited thereto.

The quinone imine-based dye may include at least one selected from the group consisting of C.I. basic blue 3 and C.I. basic blue 9, but is not limited thereto.

The quinoline-based dye may include at least one selected from the group consisting of C.I. solvent yellow 33, C.I. acid yellow 3, C.I. disperse yellow 64 and C.I. pigment red 122, but is not limited thereto.

The nitro-based dye may include at least one selected from the group consisting of C.I. acid yellow 1, C.I. acid orange 3, C.I. disperse yellow 42, and C.I. solvent orange 62, but is not limited thereto.

The methine-based dye may include C.I. solvent yellow 179, but is not limited thereto.

The colored dye according to the present embodiment may include the above-described dye as it is, or may be included in the form of a mixture obtained by dispersing, mixing, or dissolving the above-described dye in an organic solvent such as alcohol. For example, the organic solvent may be ethanol, isopropyl alcohol, or the like.

The chrome-free surface treatment composition of this embodiment may include 0.1 to 20 parts by weight of the coloring dye, specifically 1 to 17 parts by weight, and more specifically 3 to 10 parts by weight, based on 100 parts by weight of the binder composition, but is limited thereto. It doesn't work.

If the chromium-free surface treatment composition of the present embodiment contains less than 0.1 parts by weight of the coloring dye based on 100 parts by weight of the binder composition, the color realization effect may be reduced. On the other hand, when the chromium-free surface treatment composition of this embodiment contains more than 20 parts by weight of the coloring dye based on 100 parts by weight of the binder composition, there is a problem that the formulation stability and adhesion of the chromium-free surface treatment composition are deteriorated. There may be.

The chrome-free surface treatment composition of this embodiment contains a colored pigment.

The colored pigment imparts various colors to the chromium-free surface treatment composition of the present embodiment and a coating film formed using the same, and serves to impart a hiding power. In particular, the chromium-free surface treatment composition of the present embodiment includes the above-described binder composition and a colored pigment together, thereby improving the dispersibility and stability of the colored pigment and implementing an anti-aggregation effect.

The colored pigment may include one or more selected from the group consisting of inorganic pigments and organic pigments.

The inorganic pigment may include at least one selected from the group consisting of carbon black, graphite, titanium oxide, zinc oxide, iron oxide sulfur, iron oxide red, brown iron oxide, and black iron oxide, but is not limited thereto.

As the organic pigment, all kinds of known organic pigments may be applied, and there is no particular limitation.

The chrome-free surface treatment composition of this embodiment may include 0.1 to 20 parts by weight of the colored pigment, specifically 3 to 15 parts by weight, and more specifically 5 to 12 parts by weight, based on 100 parts by weight of the binder composition, but is limited thereto. It doesn't work.

If the chromium-free surface treatment composition of the present embodiment contains less than 0.1 parts by weight of the colored pigment with respect to 100 parts by weight of the binder composition, the hiding power is lowered, so that color realization may not be sufficient. On the other hand, when the chromium-free surface treatment composition of this embodiment contains more than 20 parts by weight of the colored pigment with respect to 100 parts by weight of the binder composition, there is a problem that the formulation stability and adhesion of the chromium-free surface treatment composition are deteriorated There may be.

The chrome-free surface treatment composition of the present embodiment may further include zinc flakes.

Zinc flakes may improve properties such as surface repair properties, durability, and corrosion resistance of the chromium-free surface treatment composition of the present embodiment, and may serve to supplement zinc lost due to corrosion. In addition, since the zinc flake is formed in a flake shape, it is possible to remarkably improve the compactness of the structure while preventing the penetration of corrosion factors from the outside.

The zinc flake of this embodiment may have a length: 18 to 25 micrometers and an average particle diameter (D50): 15 to 20 micrometers. Specifically, the zinc flakes of this embodiment may have a length: 18 to 25 micrometers, an average particle diameter (D50): 15 to 20 micrometers, and a thickness: 0.5 to 1 micrometer, but are not limited thereto. In this case, the zinc flake may have a color of silver or silver gray.

The chrome-free surface treatment composition of the present embodiment may further include 10 to 40 parts by weight of the zinc flake, specifically 10 to 20 parts by weight, based on 100 parts by weight of the binder composition, but is not limited thereto.

If the chromium-free surface treatment composition of the present embodiment contains less than 10 parts by weight of the zinc flake relative to 100 parts by weight of the binder composition, the effect of improving the surface repair effect, surface coloring effect, and corrosion resistance may be insignificant. . On the other hand, when the chromium-free surface treatment composition of the present embodiment contains more than 40 parts by weight of the zinc flake with respect to 100 parts by weight of the binder composition, there is a problem that the formulation stability and adhesion of the chromium-free surface treatment composition are deteriorated. There may be.

In addition to ethyl silicate, hydrochloric acid, ethanol, isopropyl alcohol, methoxy silane-based compounds, deionized water, colored dyes and colored pigments, the chromium-free surface treatment composition of this example is a curing agent, stabilizer, softener, curing agent, curing accelerator, pH It may further include additives such as a modifier, a brightener, a dispersant, an antifoaming agent, an antioxidant, and an anti-aging agent. As the additive, all kinds of known additives may be applied.

The chrome-free surface treatment composition of this embodiment is a liquid, and may be formed at a pH of 5 to 6, and a viscosity of 10 to 20 cps. (20° C., B type viscometer). Accordingly, properties such as adhesion, corrosion resistance, blackening resistance, white rust resistance, and rust resistance of the surface treatment composition according to the present embodiment may be improved.

The chromium-free surface treatment composition of the present embodiment may be applied or applied to the surface of a galvanized metal to form a coating film. The thickness of the coating film may be 3 to 15 micrometers. For example, when the galvanized metal is a steel sheet, the thickness of the coating film may be about 3 micrometers, but is not limited thereto.

In addition, when the chromium-free surface treatment composition of this example is applied to a galvanized metal, the chromium-free surface treatment composition of this example penetrates or reacts at the interface to the surface of the galvanized metal, resulting in polysilicate and zinc-silicon bonding. The formed first layer may be formed. In addition, on the first layer, a second layer including a silicon-oxygen bond by a reaction between the chromium-free surface treatment composition of the present embodiment and air may be formed.

The adhesion, adhesion, bonding strength, etc. between the metal galvanized by the first layer and the coating film formed using the chromium-free surface treatment composition of the present embodiment are improved to prevent penetration of foreign substances, while activating zinc on the surface of the galvanized metal and As elution is suppressed, corrosion resistance, blackening resistance, white rust resistance, rust resistance, and the like can be improved. In addition, as the penetration of external substances is prevented by the second layer, corrosion resistance, blackening resistance, white rust resistance, rust resistance, and the like may be further improved. The first layer and the second layer are randomly separated by each material or bonding state, and are one continuous layer.

In addition, the chromium-free surface treatment composition of the present embodiment can be easily applied on the galvanized surface of a steel product that has already been used. In other words, it is possible to improve corrosion resistance, blackening resistance, white rust resistance, rust resistance, and the like, while providing various colors on the galvanized surface of existing steel products.

(c) curing after applying the chromium-free surface treatment composition to the galvanized metal surface

In step (c) of this embodiment, the chromium-free surface treatment composition prepared in step (b) is applied to the surface of the galvanized metal and then cured. Specifically, in step (c) of the present embodiment, the chromium-free prepared in step (b) is applied to the galvanized metal surface by any one method selected from the group consisting of coating, immersion, dip spin, and spray spraying. By curing after applying the surface treatment composition, a coating film formed of the chromium-free surface treatment composition can be formed on the surface of the galvanized metal.

For example, the application may be performed by applying the chrome-free surface treatment composition of the present embodiment to the surface of the galvanized metal by means such as a brush or a roller.

In addition, the immersion may be carried out by immersing the galvanized metal in the chromium-free surface treatment composition of the present embodiment and then leaving it for a certain period of time. Specifically, it may be carried out by immersing the galvanized metal in the chromium-free surface treatment composition of the present embodiment for about 10 to 60 seconds, but is not limited thereto.

In addition, the dip spin is, after immersing the galvanized metal in the chromium-free surface treatment composition of this embodiment for about 10 to 60 seconds, and then put into a rotating basket at a rotation speed of 200 to 400 rpm, about 5 to 15 By removing for seconds, this can be done, but is not limited thereto.

In addition, the spray spraying may be carried out by spraying and applying the chromium-free surface treatment composition according to the present embodiment to the surface of the galvanized metal by a known method, but is not limited thereto.

The coating film may mean a coating layer, a film, a thin film, etc. formed by applying the chromium-free surface treatment composition of the present embodiment to the surface of a galvanized metal. The thickness of the coating film may be 3 micrometers or more, specifically 3 to 15 micrometers, but is not limited thereto.

The curing may be performed by applying the chromium-free surface treatment composition of this embodiment and then drying it at a specific temperature. For example, the specific temperature may mean room temperature ~ 100 ℃, but is not limited thereto. In particular, the chromium-free surface treatment composition of the present embodiment can be naturally dried and cured at room temperature of 15 to 25° C., so it may be convenient to use.

Specifically, the curing in step (c) of the present embodiment may be performed at room temperature for 3 to 30 minutes. In particular, in the related art, as high-temperature curing is performed, there is a limitation on a work place, and a separate facility for high-temperature curing is required, which is not economical. However, according to the present embodiment, as curing is performed at room temperature within a short period of time, there is no restriction on the working place, and since a separate facility for curing is not required, it may be economical.

If the curing in step (c) of the present embodiment is carried out at room temperature, but is carried out in less than 3 minutes, the chrome-free surface treatment composition is not sufficiently hardened, and thus there may be a problem that the effect of improving surface repair and corrosion resistance is insignificant. . On the other hand, the curing in step (c) of the present embodiment is performed at room temperature, but when it is performed for more than 30 minutes, there is no difference in the degree of curing of the chromium-free surface treatment composition, which may not be economical.

After performing step (c) of this embodiment, the process for surface repair of the galvanized metal, corrosion resistance, durability, adhesion, blackening resistance, white rust resistance, corrosion resistance, and rust prevention properties of the galvanized metal are improved. The process for, etc. may be additionally performed, but is not limited thereto.

Hereinafter, a method of treating a surface of a galvanized metal for improving surface coloring and corrosion resistance of the present invention will be described in detail through Examples, Comparative Examples, and Experimental Examples. Since these examples are for illustrative purposes only, the scope of the present invention is not to be construed as being limited by these examples.

[Example]

Examples 1 to 3

(a) First, after removing foreign substances from the galvanized metal surface, high-pressure water washing was performed, and a primer was applied to the galvanized metal surface to prepare the galvanized metal surface.

At this time, as the galvanized metal, a hot-dip galvanized steel sheet and an electro-galvanized steel sheet were used. The hot-dip galvanized steel sheet was hot-dip galvanized to a thickness of about 75 micrometers according to HDZ55 conditions of KS D 8308 standard.

(b) Preparation of chrome-free surface treatment composition

According to the composition of the following Table 1 [unit: weight%] and Table 2 [unit: weight ratio], a binder composition was prepared. In Table 1, the methoxy silane-based compounds in Table 2 were used, respectively.

Thereafter, 5 parts by weight of a colored dye (C.I red 122) and 5 parts by weight of a colored pigment (red iron oxide) were mixed with respect to 100 parts by weight of the binder composition prepared according to the above, to prepare a chromium-free surface treatment composition.

(3) Application of chrome-free surface treatment composition

After immersing the galvanized metal in the chromium-free surface treatment composition, it was dried at room temperature for about 10 minutes to form a coating film of the chromium-free surface treatment composition on the surface of the galvanized metal.

Specifically, in the case of the hot-dip galvanized steel sheet, surface treatment is performed by immersing the hot-dip galvanized steel sheet in a chrome-free surface treatment composition, and then drying the hot-dip galvanized steel sheet for about 1 to 3 minutes. I did.

In addition, in the case of the electro-galvanized steel sheet, after immersing the electro-galvanized steel sheet in a chrome-free surface treatment composition, it is dried by removing paint for about 10 to 20 seconds (Spin method, 300 to 400 rpm), Surface treatment was performed.

According to the above, it is shown in FIG. 1 that the hot-dip galvanized steel sheet was surface-treated with the chromium-free surface treatment composition of Example 2.

Example 4

Surface treatment was performed in the same manner as in Example 3, except that a chromium-free surface treatment composition including a binder composition using only glycidoxypropyltrimethylmethoxysilane was used as the methoxy silane compound.

Example 5

Surface treatment was performed in the same manner as in Example 3, except that a chromium-free surface treatment composition including a binder composition using only methyltrimethoxysilane was used as the methoxy silane compound.

Examples 6 to 8

Surface treatment was performed in the same manner as in Example 2, except that the following zinc flakes were further included in Table 3 [unit: parts by weight] in 100 parts by weight of the binder composition.

At this time, zinc flakes were used having a length of 18 to 25 micrometers, and an average particle diameter (D50) of 15 to 20 micrometers.

[Comparative Example]

Comparative Example 1

The existing chromate treatment process was performed according to the following.

The galvanized metal was washed with water, immersed in 0.5 to 1% acetic acid solution, and then washed with water and chromated. At this time, the chromate treatment was performed by immersing the galvanized metal washed according to the above in a solution of KCr(SO ₄ ) ₂ 20 g/L (Cr ³⁺ standard = 2.344 g/L) and then drying.

Subsequently, the chromate-treated galvanized metal was washed with water and hot water, and then dried at about 60°C to prepare a chromated galvanized metal.

Comparative Examples 2 to 13

Surface treatment was performed in the same manner as in Example 3, except that a chrome-free surface treatment composition containing a binder composition according to the composition of Table 4 [unit: wt%] was used.

[Experimental Example]

Experimental Example 1: Corrosion resistance test of hot-dip galvanized metal

(1) Corrosion resistance evaluation 1 (Molten galvanized steel sheet → composition application)

According to Example 1, a salt spray test (ASTM B 117 test method: NaCl 5% solution, 35° C.) was performed using each of the galvanized metal (melted zinc-plated steel sheet) on which a coating film was formed by the chromium-free surface treatment composition. , Rust (white or red rust) was observed with the naked eye. Table 5 shows the results observed with the naked eye according to the above. At this time, when rust (white or red rust) occurred, it was marked as ○, and if rust (white or red rust) did not occur, it was marked as X.

In the same manner as described above, according to Examples 2 to 8 and Comparative Examples 1 to 13, corrosion resistance evaluation of the galvanized metal on which a coating film was formed by the chromium-free surface treatment composition was performed, and the results are shown in Table 5.

(2) Corrosion resistance evaluation 2 (after forced corrosion of hot-dip galvanized steel sheet → application of composition)

In order to check the surface repair effect of the corroded hot-dip galvanized steel sheet, prior to applying the chrome-free surface treatment composition, the hot-dip galvanized steel sheet was subjected to ASTM B 117 standard (pH: 6.5 ~ 7.2, chamber temperature: 35 ℃, The hot-dip galvanized steel sheet was forcibly damaged by exposing it to a neutral salt water spray tester for about 300 hours according to the spray amount of 5% NaCl solution: 1 to 2 mL/h). That is, in order to give the same effect that the hot-dip galvanized metal was damaged by exposure to the external environment, after accelerating aging through salt spray, the following experiment was conducted.

Thereafter, the damaged hot-dip galvanized steel sheet was subjected to surface treatment according to Example 1 to form a coating film using the chrome-free surface treatment composition.

Subsequently, after exposing the hot-dip galvanized steel sheet on which a coating film was formed by the chrome-free surface treatment composition according to Example 1 to brine according to the ASTM B 117 standard, rust (white rust or red rust) over time while observing it with the naked eye. It evaluated the presence or absence of generation|occurrence|production, and the results are shown in Table 6. In this case, if rust (white or red rust) occurred regardless of the amount of occurrence, it was marked as'○', and if rust (white or red rust) did not occur, it was marked as'Х'.

In addition, using the compositions of Examples 2 to 8 and Comparative Examples 1 to 13 in the same manner as above, the corrosion resistance of the hot-dip galvanized metal was evaluated in the same manner as above, and the results are shown in Table 6.

Looking at Tables 5 and 6, it can be seen that rust is rapidly generated in the case of the comparative example not according to the present embodiment compared to the example according to the present embodiment.

In more detail, referring to Examples 1 to 3 and Comparative Example 1, it can be seen that the rust prevention effect is remarkably superior when the chromium-free surface treatment composition of this example is treated as compared to the conventional chromate treatment. In addition, referring to Examples 1 to 3 and Comparative Examples 2 to 13, the chromium-free surface treatment composition of this example contains ethyl silicate, hydrochloric acid, ethanol, isopropyl alcohol, methoxy silane compound, colorant, and deionized water in a specific amount. When the containing binder composition is included, it can be seen that the rust prevention effect is improved.

In addition, looking at Examples 1 to 3 and Examples 4 to 5, it can be seen that when glycidoxypropyltrimethoxysilane and methyltrimethoxysilane are included together as a methoxysilane-based compound, the rust prevention effect is improved. have. Particularly, referring to Examples 1 to 3, when glycidoxypropyltrimethoxysilane and methyltrimethoxysilane are included as methoxy silane compounds, when they are included in a specific ratio (1: 1.25 weight ratio), rust prevention It can be seen that the effect is improved.

In addition, looking at Examples 2 and 6 to 8, the chrome-free surface treatment composition of the present embodiment further comprises zinc flakes, but further comprises 10 to 40 parts by weight of the zinc flakes based on 100 parts by weight of the binder composition. In this case, it can be seen that the effect of improving the corrosion resistance is remarkably excellent. In particular, looking at the results of Table 6 using the already corroded hot-dip galvanized metal, it can be seen that when the zinc flake is further included in an amount of 10 to 40 parts by weight with respect to 100 parts by weight of the binder composition, the effect of improving corrosion resistance is excellent. have. That is, when the chromium-free surface treatment composition of the present embodiment further contains 10 to 40 parts by weight of the zinc flake relative to 100 parts by weight of the binder composition, corrosion resistance is generated by repairing the surface of the hot-dip galvanized metal damaged. It means making it possible to re-implement it.

Experimental Example 2: Corrosion resistance test of electro-galvanized metal

The corrosion resistance of Example 1 was evaluated in the same manner as in Experimental Example 1, but an electro-galvanized steel sheet was used in place of the hot-dip galvanized steel sheet, and the results are shown in Tables 7 and 8.

Corrosion resistance evaluation of the compositions according to Examples 2 to 8 and Comparative Examples 1 to 13 was performed in the same manner as in Example 1.

(1) Corrosion resistance evaluation 1 (electric galvanized steel sheet → composition application)

(2) Corrosion resistance evaluation 2 (after forcibly damaging the electro-galvanized steel sheet → application of the composition)

Referring to Tables 7 and 8, it can be seen that rust is rapidly generated in the case of the comparative example not according to the present embodiment compared to the example according to the present embodiment.

In addition, looking at Examples 1 to 3 and Comparative Example 1, it can be seen that the rust prevention effect is remarkably superior when the chromium-free surface treatment composition of this example is treated as compared to the conventional chromate treatment. In addition, referring to Examples 1 to 3 and Comparative Examples 2 to 13, the chromium-free surface treatment composition of this example contains ethyl silicate, hydrochloric acid, ethanol, isopropyl alcohol, methoxy silane compound, colorant, and deionized water in a specific amount. When the containing binder composition is included, it can be seen that the rust prevention effect is improved.

In addition, looking at Examples 1 to 3 and Examples 4 to 5, it can be seen that when glycidoxypropyltrimethoxysilane and methyltrimethoxysilane are included together as a methoxysilane-based compound, the rust prevention effect is improved. have. Particularly, referring to Examples 1 to 3, when glycidoxypropyltrimethoxysilane and methyltrimethoxysilane are included as methoxy silane compounds, when they are included in a specific ratio (1: 1.25 weight ratio), rust prevention It can be seen that the effect is improved.

In addition, looking at Examples 2 and 6 to 8, the chrome-free surface treatment composition of the present embodiment further comprises zinc flakes, but further comprises 10 to 40 parts by weight of the zinc flakes based on 100 parts by weight of the binder composition. In this case, it can be seen that the effect of improving the corrosion resistance is remarkably excellent. In particular, looking at the results of Table 8 using the electro-galvanized metal that has already been corroded, it can be seen that when the zinc flake is further included in an amount of 10 to 40 parts by weight with respect to 100 parts by weight of the binder composition, the effect of improving corrosion resistance is excellent. have. That is, when the chromium-free surface treatment composition of the present embodiment further contains 10 to 40 parts by weight of the zinc flake relative to 100 parts by weight of the binder composition, corrosion resistance is generated by repairing the surface of the electro-galvanized metal damaged. It means making it possible to re-implement it.

Experimental Example 3: Adhesion test

In the same manner as in Experimental Example 1, after applying the chromium-free surface treatment composition according to Example 1 to the surface of the hot-dip galvanized steel sheet to form a coating film, according to the cross-cut test method (ASTM D 3359 test standard), molten zinc The adhesion between the plated metal and the chromium-free surface treatment composition was evaluated as 0B to 5B, and is shown in Table 9.

In Table 9, the average value of repeating the experiment 5 times is described, and in the case of 5B, it means the most excellent adhesion.

0B: more than 65% of the separated area

1B: 35-65% of separated area

2B: Separated area is 15 ~ 35%

3B: 5 ~ 15% of the separated area

4B: Separated area is less than 5%

5B: 0% of separated area

Referring to Table 9, it can be seen that in Examples 1 to 8 according to the present embodiment, adhesion is superior compared to Comparative Examples 1 to 13 not according to the present embodiment.

As described above, the description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains can easily transform into other specific forms without changing the technical spirit or essential features of the present invention. You can understand. Therefore, the embodiments described above are illustrative in all respects, and should be understood as non-limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

Claims (13)

(a) arranging the galvanized metal surface;
(b) a binder composition containing ethyl silicate, hydrochloric acid, ethanol, isopropyl alcohol, a methoxy silane compound, and deionized water; Coloring dyes; And a coloring pigment; preparing a chromium-free surface treatment composition by mixing; And
(c) applying the chromium-free surface treatment composition to the surface of the galvanized metal, followed by curing; including,
Based on the total weight of the binder composition, ethyl silicate 47 to 55% by weight, hydrochloric acid 0.1 to 4% by weight, ethanol 10 to 25% by weight, isopropyl alcohol 2 to 7% by weight, methoxy silane compound 5 to 15% by weight and dehydration Contains 10 to 20% by weight of ionized water,
Further comprising 10 to 40 parts by weight of zinc flakes based on 100 parts by weight of the binder composition, wherein the zinc flakes have a length: 18 to 25 micrometers and an average particle diameter (D50): 15 to 20 micrometers, surface Method for surface treatment of galvanized metal for coloring, surface repair and corrosion resistance improvement.
The method of claim 1,
The step (a) is
(a-1) removing foreign substances from the zinc-plated metal surface;
(a-2) washing the surface of the galvanized metal; And
(a-3) applying a primer to the surface of the galvanized metal and then curing the surface of the galvanized metal, characterized in that it further comprises, surface treatment of the galvanized metal for improving surface coloring, surface repair and corrosion resistance.
The method of claim 1,
The chrome-free surface treatment composition
Surface treatment method of galvanized metal for improving surface coloring, surface repair and corrosion resistance, characterized in that it comprises 0.1 to 20 parts by weight of the colored dye and 0.1 to 20 parts by weight of the colored pigment based on 100 parts by weight of the binder composition .
delete The method of claim 1,
The methoxy silane compound is
Glycidoxypropyltrimethoxysilane (Glycidoxypropyltrimethoxysilane) and methyltrimethoxysilane (Methyltrimethoxysilane), characterized in that it comprises, surface coloring, surface repair, and surface treatment of galvanized metal for improving corrosion resistance.
The method of claim 5,
The methoxy silane compound is
A method for surface treatment of galvanized metal for improving surface coloring, surface repair, and corrosion resistance, comprising glycidoxypropyltrimethoxysilane and methyltrimethoxysilane in a weight ratio of 1:0.5-2.
The method of claim 1,
The coloring dye is
Azo dyes, anthraquinone dyes, xanthene dyes, triarylmethane dyes, phthalocyanine dyes, quinone imine dyes, quinoline dyes, nitro dyes and methine dyes. A method for treating a surface of a galvanized metal for improving surface coloring, surface repair and corrosion resistance, characterized in that.
The method of claim 1,
The colored pigment is
A method for treating a surface of a galvanized metal for improving surface coloring, surface repair, and corrosion resistance, comprising at least one selected from the group consisting of inorganic pigments and organic pigments.
delete delete delete The method of claim 1,
In step (c)
Applying the chromium-free surface treatment composition to the surface of the galvanized metal is characterized in that it is carried out by any one method selected from the group consisting of coating, immersion, dip spin and spray spray, surface coloring, surface Surface treatment method of galvanized metal to improve repair and corrosion resistance.
The method of claim 1,
In step (c),
A method for treating a surface of a galvanized metal for improving surface coloring, surface repair, and corrosion resistance, characterized in that the chromium-free surface treatment composition is cured at room temperature for 3 to 30 minutes.

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