KR20100049944A - Composition for metal surface treatment and method for preparing thereof - Google Patents

Abstract

PURPOSE: A composition for metal surface treatment and a manufacturing method thereof are provided to prevent environmental pollution without using chrome and a solvent. CONSTITUTION: A composition for metal surface treatment comprises silane coupling agent and silica. The silane coupling agent comprises silicon atom 0.1~0.5 weight%. The silane coupling agent has one or more functional groups selected from an epoxy group or an amino group. The silica is formed by mixing fumed silica and colloidal silica.

Description

Composition for metal surface treatment and method for preparing according to the present invention

The present invention relates to a metal surface treatment composition and a method for producing the same.

In general, metal materials such as zinc plated steel, aluminum, or stainless steel are widely used for metal materials for home appliances as well as construction materials and automotive steel sheets.

However, since these metals are easily corroded or contaminated, a constant coating treatment on the surface of the metal material is performed to impart corrosion resistance or fouling resistance to the metal material.

In the conventional method of surface treatment of metal materials, chromate treatment, lubrication treatment or anti-fingerprint treatment, etc. have been used. Among them, chromate treatment gives surface treatment characteristics such as excellent corrosion resistance and paintability to steel sheet at low processing cost. It has been used a lot.

However, chromium used in the chromate treatment has a problem that serious damage to human body and environment as a representative pollutant, and measures are being taken to regulate the use of chromium worldwide. It is expected to be.

Therefore, as an environmentally friendly surface treatment method excluding such chromium, a number of developments and methods for lubrication treatment or anti-fingerprint treatment have been proposed, but such a method has a problem of being vulnerable to corrosion resistance and conductivity, and especially contains organic substances such as resins. As a result, there was a big problem in heat resistance.

The present invention has been made to solve the above problems, and has an object of providing an environmentally friendly composition for metal surface treatment having excellent physical properties such as conductivity, processability and heat resistance.

Another object of the present invention is to provide a surface-treated steel sheet having excellent physical properties and surface treatment using an environmentally friendly metal surface treatment composition.

Still another object of the present invention is to provide a method for preparing a composition for metal surface treatment, which has excellent physical properties.

Still another object of the present invention is to provide a surface treatment method of a metal material using an environmentally friendly composition for metal surface treatment, which has excellent physical properties to improve weldability and paint adhesion.

The present invention is a means for solving the above problems, comprising a silane coupling agent and silica, the weight ratio of the silicon atoms contained in the silane coupling agent and the silicon atoms contained in the silica is 0.1 to 0.5 for the composition for metal surface treatment to provide.

In addition, the present invention is another means for solving the above problems, a metal steel sheet; And a coating layer formed on one or both surfaces of the metal steel sheet and containing a composition for treating a metal surface according to the present invention.

In addition, the present invention as another means for solving the above problems, a) preparing a silane coupling agent and silica; And b) mixing the silane coupling agent and silica so that the weight ratio of silicon atoms (Si) contained in the silane coupling agent and silicon atoms (Si) contained in the silica is 0.1 to 0.5. Provided are methods for preparing the composition.

In addition, the present invention as another means for solving the above problems, the step of applying a composition for metal surface treatment according to the invention on a steel sheet; And it provides a surface treatment method of a metal material comprising the step of drying the steel sheet coated with the composition.

As described above, the composition for treating the metal surface of the present invention and the surface-treated steel sheet coated with the same are excellent in heat resistance, conductivity, corrosion resistance, processability, storage stability of solution, and do not contain chromium and solvents. .

In addition, according to the manufacturing method of the metal surface treatment composition and the surface treatment method of the metal material using the metal surface treatment composition of the present invention, it is possible to prepare a metal surface treatment composition exhibiting excellent physical properties and environmental friendliness, By using this method, weldability and paint adhesion required for the surface treatment of metal materials can be improved.

The present invention relates to a metal surface treatment composition comprising a silane coupling agent and silica, wherein the weight ratio of silicon atoms (Si) contained in the silane coupling agent and silicon atoms (Si) contained in the silica is 0.1 to 0.5.

Hereinafter, the composition for metal surface treatment of this invention is demonstrated in detail.

As described above, the composition for metal surface treatment of the present invention includes a silane coupling agent and silica, but the weight ratio of the silicon atoms contained in the silane coupling agent and the silicon atoms contained in the silica is preferably 0.1 to 0.5, It is more preferable that it is 0.2-0.4.

In the present invention, the weight ratio of the silicon atoms contained in the silane coupling agent and the silicon atoms contained in the silica refers to the weight ratio of the weight of the silicon atoms contained in the silane coupling agent to the weight of the silicon atoms contained in the silica.

When the weight ratio of the silicon atoms contained in the silane coupling agent and the silicon atoms contained in the silica is less than 0.1, there is a problem in that the degree of crosslinking of the coating film is lowered and the effect of improving corrosion resistance and adhesion is lowered. As the number increases, the heat resistance is decreased, and the degree of crosslinking is excessively increased, thereby decreasing the stability of the solution as well as the coating property.

The silane coupling agent is a material for improving adhesion and corrosion resistance with a material, for example, one selected from the group consisting of a silane coupling agent having at least one functional group selected from an epoxy group or an amino group and hydrolyzed condensates thereof. It may be abnormal.

Here, the hydrolysis-condensation product of a silane coupling agent means the oligomer of the silane coupling agent which hydrolyzed and polymerized the silane coupling agent.

As a more specific example, the silane coupling agent is γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane, N- (β-aminoethyl) -γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, It is preferably at least one selected from the group consisting of 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane.

However, the silane coupling agent is not limited to those exemplified above, and may include all of the silane coupling agents and mixtures thereof to improve the adhesion and the corrosion resistance with the material according to the object of the present invention.

On the other hand, the silica serves to improve the processability and corrosion resistance of the metal surface treatment composition according to the present invention, for example, may be colloidal silica, fumed silica or a mixture thereof.

Here, the silica is preferably colloidal silica having an average particle diameter of 5 to 15nm.

The average particle diameter of the colloidal silica may vary depending on the type and roughness of the material, but when the average particle diameter of the colloidal silica exceeds 15 nm, it is difficult to expect improvement in corrosion resistance due to a barrier effect on the material. In the case of less than 5 nm, the price of colloidal silica is greatly increased and the economic effect is reduced.

However, the silica is not limited to those exemplified above, and may include all silicas capable of improving processability and corrosion resistance according to the object of the present invention.

On the other hand, the composition for metal surface treatment according to the present invention preferably has a pH of 3 to 6, more preferably 3.5 to 5, still more preferably 4.0 to 4.5, particularly preferably 4.1 to 4.5.

When the pH of the composition is outside the range of 3 to 6, curing of the solution may be accelerated to shorten the life of the solution.

Therefore, it is possible to add an additive for adjusting the pH of the composition to the numerical range, specific examples of the additive, as to lower the pH of the composition, it can be used phosphoric acid or ammonium monophosphate, As for raising the pH, ammonium triphosphate or dilute ammonia water can be used.

In addition, the composition for metal surface treatment according to the present invention preferably further comprises at least one metal compound selected from the group consisting of vanadium compounds, zirconium compounds, titanium compounds, aluminum compounds and cerium compounds.

The metal compound is to improve the corrosion resistance of the metal surface treatment composition according to the present invention, for example, the vanadium compound is vanadium oxide, ammonium metavanadate, vanadium oxyacetylacetonate, vanadium acetylacetonate or May be vanadium trichloride, the zirconium compound may be zirconyl nitrate, zirconyl acetate, zirconyl ammonium carbonate or zirconium acetylacetonate, the titanium compound may be titanyl sulfate or titanium lactate, the aluminum compound Silver aluminum sulfate or aluminum nitrate, and the cerium compound may be cerium nitrate.

However, the metal compound according to the present invention is not limited to the above exemplified metal compound, and various metal compounds capable of improving the corrosion resistance of the metal surface treatment composition according to the object of the present invention may be included therein.

Furthermore, the metal surface treatment composition according to the present invention preferably contains 5 to 15 parts by weight of the silane coupling agent, 5 to 10 parts by weight of silica, and 0.5 to 3 parts by weight of the metal compound.

When the silane coupling agent is less than 5 parts by weight, it is difficult to exhibit the effect of improving physical properties such as adhesion and corrosion resistance, and when it exceeds 15 parts by weight, the heat resistance is decreased, the solution stability is lowered, and the effect of improving the physical properties such as corrosion resistance is not increased. It is uneconomical.

In addition, when the silica is less than 5 parts by weight, the effect of improving the physical properties is insufficient, if it exceeds 10 parts by weight, the coating film is too hard to break during processing, thereby causing scratches on the coating film has a problem of lowering the corrosion resistance.

Furthermore, when the metal compound is less than 0.5 parts by weight, the corrosion resistance may not be sufficiently improved, and when the metal compound is more than 3 parts by weight, the solubility of the aqueous metal surface treatment composition may be degraded and the storage stability of the solution may deteriorate.

On the other hand, the composition for treating the metal surface according to the present invention may further include a lubricant for improving workability and imparting self-lubrication.

The lubricant may be, for example, at least one selected from the group consisting of water-soluble paraffin wax, olefin wax, carnauba wax, polyethylene wax and polytetrafluoroethylene wax, preferably polyethylene wax and polytetrafluoroethylene wax. Preference is given to using mixtures of these.

In addition, the lubricant is preferably contained in 1 to 3 parts by weight of the metal surface treatment composition.

When the content of the lubricant is less than 1 part by weight, the lubrication action of the coating film does not occur, so the effect of improving the workability and formability is not sufficient, and when the amount is more than 3 parts by weight, no further lubrication effect is exerted. There is a problem that performance and stability of the solution may be degraded.

On the other hand, the composition for metal surface treatment according to the present invention may further include one or more solvents selected from the group consisting of water, alcohols, esters and ethers.

That is, the composition for metal surface treatment according to the present invention is preferably an aqueous surface treatment composition further comprising such a solvent, and by further including such a solvent to form a solid coating film with improved film forming properties of the coating film. can do.

Furthermore, if necessary, the metal surface treatment composition may further include an additive such as a curing agent, an antifoaming agent or a wetting agent to improve physical properties.

The metal surface treatment composition according to the present invention having the composition as described above has an excellent heat resistance, conductivity, corrosion resistance, processability, and storage stability of the solution to the steel sheet, and does not contain chromium.

In addition, the present invention is a metal steel sheet as described above; And a coating layer formed on one or both surfaces of the metal steel sheet and containing a composition for metal surface treatment according to the present invention.

Here, the metal steel plate means a metal used for the purpose of automobile materials, home appliances, building materials, and the like, specifically metal such as iron plate, and any steel sheet commonly used in the art for this purpose may be used. Preferably, cold rolled steel sheet; Zinc-based electroplating steel sheets such as galvanized steel sheet, zinc nickel plated steel sheet, galvanized steel sheet, zinc titanium plated steel sheet, zinc magnesium plated steel sheet, zinc manganese plated steel sheet and zinc aluminum plated steel sheet; Hot-dip galvanized steel sheet; Aluminum plated steel sheet; Further, plated steel sheets containing, as the dissimilar metals or impurities in these plating layers, for example, cobalt, molybdenum, tungsten, nickel, titanium, aluminum, manganese, iron, magnesium, tin, copper, and the like; Further, plated steel sheet in which inorganic materials such as silica and alumina are dispersed in these plating layers; Or an aluminum alloy plate containing silicon, copper, magnesium, iron, manganese, titanium, zinc or the like; Or galvanized steel sheet coated with phosphate; Alternatively, a hot rolled steel sheet may be used, and a multilayer plated sheet obtained by sequentially treating two or more kinds during the plating may be used as necessary.

In addition, a method of applying the coating layer containing the metal surface treatment composition to a metal sheet may be a roll coater method, a shower squeeze method, a deposition method or a spray method.

As described above, the metal material including the coating layer containing the metal surface treatment composition according to the present invention does not contain chromate, so it is harmless to the human body and has an advantage of reducing the risk of environmental pollution.

In addition, the adhesion amount after drying of the coating layer is preferably 0.5 to 1.5 g / ㎡.

Here, when the coating amount after drying of the coating layer is less than 0.5 g / ㎡, there is a fear that the corrosion resistance and workability, etc. are reduced, and if it exceeds 1.5 g / ㎡ there is a fear that the adhesion, weldability and adhesion of the coating is inferior.

In addition, the present invention comprises the steps of a) preparing a silane coupling agent and silica; And b) mixing the silane coupling agent and silica so that the weight ratio of silicon atoms (Si) contained in the silane coupling agent and silicon atoms (Si) contained in the silica is 0.1 to 0.5. It relates to a method for preparing the composition.

Step b) c) stirring the silane coupling agent and silica to prepare a mixture having a viscosity of 8.0 to 10.0 cps; And d) cooling the mixture.

That is, it is preferable that the crosslinking reaction is carried out by stirring the silane coupling agent and silica, and the stirring is continued until the viscosity of the mixture of the silane coupling agent and the silica becomes 8.0 to 10.0 cps, and becomes 9.0 to 10.0 cps. It is more preferable to continue stirring until it is.

In this case, when the cooling is performed after the viscosity of the mixture exceeds 10.0 cps, it is difficult to control the viscosity of the solution, which may deteriorate the stability and coating property of the solution. When the viscosity of the mixture is lower than 8.0 cps, the cooling is performed. If it is, the crosslinking of the solution is insufficient and it is difficult to expect the effect such as corrosion resistance.

It is also preferred to further comprise e) controlling the pH of the mixture cooled in step d) to 3-6.

Furthermore, f) further adding an additive comprising a metal compound or a lubricant to the pH controlled mixture in step e); And g) controlling the pH of the mixture obtained in step f) to 3-6.

As described above, the pH of the mixture is more preferably controlled to 3.5 to 5, more preferably 4.0 to 4.5, and particularly preferably 4.1 to 4.5.

In addition, the present invention comprises the steps of applying the metal surface treatment composition to a steel sheet; And it relates to a surface treatment method of a metal material comprising the step of drying the steel sheet coated with the composition.

Here, the composition is preferably applied in a dry coating amount of 0.5 to 1.5 g / ㎡.

When the dry coating amount of the coating layer is less than 0.5 g / m 2, corrosion resistance and workability may be reduced, and when the dry coating film amount is more than 1.5 g / m 2, conductivity, weldability, and adhesion of paint may be deteriorated.

Moreover, it is preferable that drying temperature is 80-200 degreeC.

Here, when the composition is coated and the drying temperature is less than 80 ° C. at the time of baking, there is a problem that hardening is not performed well and thus sufficient coating film formation may not be achieved. Cooling is not easy, and there is a problem that the overall performance may be reduced due to deformation of the coating film component bond such as carbonization of the coating film.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the present invention is not limited by the following examples.

Example 1

125 g of γ-glycidoxy propyltrimethoxysilane and colloidal silica having an average particle diameter of 5.5 nm were added to the reaction vessel to prepare a mixed solution, and the mixture was stirred and mixed so that the content of silicon (Si) was 0.2 parts by weight. .

After the viscosity of the mixed solution was 9.5 cps, the cooling water was started to drop the temperature of the solution to 40 ° C., and water was added so that the total amount of the aqueous surface treatment composition containing the mixed solution was 900 g, followed by pH using phosphoric acid. Was adjusted to 4.3.

Subsequently, 10 g of aluminum sulfate and 20 g of polyethylene wax were added to the aqueous surface treatment composition, water was further added so that the total amount of the composition was 1000 g, and then aqueous ammonium phosphate was added and stirred for 1 hour so that the final pH was 4.3. A surface treatment composition was prepared.

The aqueous surface treatment composition thus prepared was bar-coated on an electrogalvanized steel sheet having a surface coating weight of 20 g / m 2 so that the dry coating amount was 1.0 g / m 2, and dried until the steel sheet temperature reached 150 ° C., followed by air cooling. The treated galvanized steel sheet was prepared.

[Examples 2-5 and Comparative Examples 1-4]

Examples 2 to 5 and Comparative Examples 1 to 4, the type and amount of the silane coupling agent, the amount of silicon contained in the mixture of the silane coupling agent and colloidal silica, the final viscosity of the mixture of the silane coupling agent and colloidal silica, An aqueous surface treatment composition was prepared in the same manner as in Example 1 except for changing the type and amount of the metal compound and the lubricant, the baking temperature and the dry coating amount, and the pH of the solution as shown in Table 1 below. The surface-treated galvanized steel sheet was prepared.

division Addition amount (% by weight) and Si content in the mixture Viscosity (cps) pH Drying temperature (℃) Dry coating amount (g / ㎡) Silane coupling agent Si content in the mixture Metal compound slush Example One A1 (12.5) 0.2 B1 (1.0) C1 (2.0) 9.5 4.3 150 1.0 2 A2 (8.5) 0.3 B2 (2.0) C2 (3.0) 9.1 4.5 120 1.2 3 A4 (10.0) 0.25 B4 (1.5) C1 (1.0) C2 (1.0) 9.8 4.1 90 0.8 4 A3 (15.0) 0.35 B3 (3.0) C2 (1.5) 9.5 4.3 100 1.5 5 A1 (5.0) A2 (7.5) 0.40 B2 (1.0) C1 (2.0) 9.0 4.4 80 1.0 Comparative Example One A1 (15.0) 0.8 B3 (1.0) C2 (1.0) 9.3 4.3 100 1.5 2 A2 (10.0) 0.1 - C1 (2.5) 9.4 4.5 80 0.5 3 A3 (7.5) 0.5 B4 (2.0) C1 (1.0) 7.0 4.4 100 0.8 4 A2 (10.0) 0.4 B2 (2.0) C2 (1.5) 9.4 8.0 150 0.8

Note) Deionized water addition amount: remaining amount

A: Silane Compound

A1: gamma-glycidoxypropyltrimethoxysilane

A2: gamma-aminopropyltriethoxysilane

A3: N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane

A4: γ-glycidoxypropylmethyldimethoxysilane

B: metal compound

B1: aluminum sulfate

B2: cerium nitrate

B3: ammonium metavanadate

B4: isopropyl titanate

C: lubricant

C1: Polyethylene Wax

C2: polytetrafluoroethylene wax

The heat resistance, conductivity, corrosion resistance, processability and solution storage stability of the steel sheets of Examples 1 to 5 and Comparative Examples 1 to 4, which were coated using the aqueous surface treatment composition prepared according to the conditions described above, were evaluated.

[Experimental Example]

1. Heat resistance test

After the steel sheets surface-treated according to Examples 1 to 5 and Comparative Examples 1 to 4 were left at a temperature of 250 ° C. for 30 minutes, the color difference before and after was measured, and classified according to the degree of color difference change.

○: color difference change (ΔE) less than 3

Δ: color difference change (ΔE) 3 to 5

×: color difference change (ΔE) 5 exceeded

2. Conductivity test

The electrical resistance value of the surface of the test plate was measured using a surface electrical resistance measuring instrument (Mitsubishi Chemical Co., Ltd., Loresta EP), and classified according to the surface electrical resistance value as follows.

○: Surface electrical resistance value is 1Ω or less

△: Surface electrical resistance value sometimes exceeds 1Ω

×: Surface electrical resistance value is over 1Ω

3. Corrosion Resistance Test

5% saline was sprayed on the surface of the workpiece at 35 ° C, and the degree of white rust after 72 hours was evaluated at three levels, and evaluation criteria were classified as follows. In this case, evaluation was performed only about the flat part.

○: No corrosion or very slight white rust (corrosion area within 5% of the evaluation area)

(Triangle | delta): Slightly white rust generate | occur | produces 5-10% of the evaluation area.

×: Some or more white rust occurs (corrosion area of more than 10% of the evaluation area)

4. Machinability Test

The surface of the test piece was visually evaluated after reciprocating 10 times at a load of 0.25 kgf / mm 2 using a Tribometer tester. Evaluation criteria are as follows.

○: almost no blackening

△: blackening partially occurs in the evaluation site

×: Blackening of entire evaluation site

5. Storage stability test

The aqueous surface treatment composition solution prepared above was stored for 2 months in an incubator at 40 ° C., and then the state of viscosity increase, separation, and precipitation of the composition was observed. Evaluation criteria are as follows.

(Circle): The change of a composition is not recognized.

X: Changes in viscosity increase, separation or precipitation of the composition are recognized.

Evaluation results according to the various physical property tests as described above are summarized in Table 2 below. Referring to Table 2 below, in the case of the steel sheets of Examples 1 to 5 coated with the surface treatment composition of the present invention, the heat resistance, corrosion resistance, processability, heat resistance, and storage stability of the solution were all excellent. In particular, the processability was excellent.

However, the steel sheet coated with the composition of Comparative Example 1 in which the content of silicon in the mixed solution of the silane coupling agent and silica was outside the content range of silicon according to the composition for metal surface treatment of the present invention, the heat resistance and the storage of solution Stability was inferior.

In addition, the steel sheet coated with the composition of Comparative Example 2, which does not contain a metal compound, appeared to be somewhat insufficient in corrosion resistance, and the final viscosity of the mixed solution in which the silane coupling agent and the colloidal silica was mixed was the composition for metal surface treatment of the present invention. To the composition of Comparative Example 4 showing a higher pH value outside the pH range of the steel sheet and the composition for a metal surface treatment of the present invention coated with the composition of Comparative Example 3 was stopped and cooled before reaching the viscosity range of the mixed solution according to the present invention. In the case of the coated steel sheet, the corrosion resistance was insufficient, and in particular, the steel sheet coated with the composition of Comparative Example 4 was also found to be inferior in storage stability of the solution.

division Heat resistance conductivity Corrosion resistance Machinability Solution stability Example One ○ ○ ○ ○ ○ 2 ○ ○ ○ ○ ○ 3 ○ ○ ○ ○ ○ 4 ○ ○ ○ ○ ○ 5 ○ ○ ○ ○ ○ Comparative Example One × ○ ○ ○ △ 2 ○ ○ △ ○ ○ 3 ○ ○ × ○ ○ 4 ○ ○ × ○ ×

Claims (20)

Silane coupling agents and silica, The weight ratio of the silicon atom contained in the silane coupling agent and the silicon atom contained in the silica is 0.1 to 0.5 composition for metal surface treatment. The method of claim 1, The silane coupling agent is at least one member selected from the group consisting of a silane coupling agent having at least one functional group selected from an epoxy group or an amino group and hydrolyzed condensates thereof. The method of claim 1, The silane coupling agent is γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methglyoxypropyltrimethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethicone Oxysilane, N- (β-aminoethyl) -γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, and 2- (3,4 Epoxycyclohexyl) ethyltrimethoxysilane is at least one selected from the group consisting of metal surface treatment composition. The method of claim 1, Silica is a fumed silica, colloidal silica, or a mixture for treating the metal surface, characterized in that a mixture thereof. The method of claim 1, Silica is a composition for metal surface treatment, characterized in that the colloidal silica having an average particle diameter of 5 to 15nm. The method of claim 1, pH is 3 to 6, the composition for metal surface treatment. The method of claim 1, A composition for metal surface treatment, further comprising at least one metal compound selected from the group consisting of vanadium compounds, zirconium compounds, titanium compounds, aluminum compounds and cerium compounds. The method of claim 7, wherein 5 to 15 parts by weight of a silane coupling agent, 5 to 10 parts by weight of silica and 0.5 to 3 parts by weight of a metal compound. The method of claim 1, Water-soluble paraffin wax, olefin wax, carnauba wax, polyethylene wax and polytetrafluoroethylene wax 1 to 3 parts by weight of at least one lubricant selected from the group consisting of wax composition for metal surface treatment. The method of claim 1, The composition for metal surface treatment, further comprising at least one solvent selected from the group consisting of water, alcohols, esters and ethers. Metal steel plate; And A metal material formed on one or both surfaces of the metal steel sheet and comprising a coating layer containing the composition for metal surface treatment according to any one of claims 1 to 10. The method of claim 11, The metal sheet is cold rolled steel sheet; galvanized steel; Zinc-based electroplating steel sheet; Hot dip galvanized steel sheet; Aluminum plated steel sheet; A plated steel sheet containing an impurity or a dissimilar metal which is cobalt, molybdenum, tungsten, nickel, titanium, aluminum, manganese, iron magnesium, tin, copper or a mixture thereof; Aluminum alloy plate to which silicon, copper magnesium, iron, manganese, titanium, zinc or a mixture thereof is added; Phosphate coated galvanized steel sheet; And a hot rolled steel sheet. The method of claim 11, Metallic material, characterized in that the adhesion amount after drying of the coating layer is 0.5 to 1.5 g / ㎡. a) preparing a silane coupling agent and silica; And b) mixing the silane coupling agent and silica such that the weight ratio of silicon atoms (Si) contained in the silane coupling agent and silicon atoms (Si) contained in the silica is 0.1 to 0.5. Manufacturing method. The process of claim 14, wherein step b) c) stirring the silane coupling agent and silica to prepare a mixture having a viscosity of 8.0 to 10.0 cps; And d) a method for producing a composition for metal surface treatment, comprising the step of cooling the mixture. The method of claim 15, e) controlling the pH of the mixture cooled in step d) to 3 to 6; The method of claim 16, f) further adding an additive comprising a metal compound or a lubricant to the pH controlled mixture in step e); And g) controlling the pH of the mixture obtained in step f) to 3 to 6; Applying a composition according to any one of claims 1 to 10 on a steel sheet; And drying the steel sheet coated with the composition. The method of claim 18, The composition is a surface treatment method of a metal material, characterized in that applied in a dry coating amount of 0.5 to 1.5 g / ㎡. The method of claim 18, Drying temperature is 80 to 200 ℃ surface treatment method of a metal material, characterized in that.