KR20200022087A - Phosphate Compound Coating Composition for Improving Lubrication - Google Patents

Abstract

The present invention provides a coating agent composition comprising 3-6 parts by weight of phosphate (H_3PO_4), 1-3 parts by weight of manganese carbonate (MnCO_3), 0.01-0.1 parts by weight of nickel nitrate [Ni(NO_3)_2ㅇ6H_2O], 0.2-0.6 parts by weight of ammonium sulfate [(NH_4)_2SO_4], and 3-20 parts by weight of molybdenum disulfide (MoS_2) based on 100 parts by weight of distilled water. According to the present invention, the phosphate compound coating agent composition for improving lubrication forms a phosphate or an oxide coating compound layer with high fixation and stability on a metal surface to use the physicochemical properties of a coated surface layer to improve wear resistance, corrosion resistance, and lubrication and eliminate needs of separate lubrication improvement work or the like to reduce chemical consumption amounts by shortening chemical conversion treatment time and thereby easily secure price competitiveness.

Description

Phosphate Compound Coating Composition for Improving Lubrication

The present invention relates to a phosphate composite coating composition for improving lubricity, and more particularly, to a phosphate for improving lubricity by making a fine and fine particle on a surface of a material using a composite coating composition including Mn-P-MoS ₂ . It relates to a composite coating composition.

BACKGROUND ART Automobile bodies, automobile parts, and home appliances are commercialized by applying metal materials such as steel sheets, galvanized steel sheets, and aluminum alloys to metal moldings, and then painting and assembling them.

As a method of metal surface treatment for such commercialization, a coating obtained by dissolving a part of the surface of the material from a metal salt bath of an organic-inorganic acid by an electrochemical method on the surface of the material and replacing metal salts with a conversion coating It is also called a chemical film.

In this case, the coating is an electric flotation conductor, an inorganic material, and is treated for the purpose of improving the rust resistance and coating adhesion of a metal material made by a chemical reaction and imparting abrasion resistance to cold metal deformation, lubrication, and / or securing electrical insulation. It is used for such purposes.

Surface treatment is a process that cannot be skipped no matter what kind of paint is applied, and if the adjustment of the surface (surface treatment) is insufficient, the performance of the paint may not be sufficiently exhibited, and a loss may be caused. Thus, a perfect surface treatment is an essential treatment process.

Although coating chemicals were developed in the 6's and 70's, they were not widely spread due to problems in coating properties (especially chromium elution). Since the mid 80's, many solutions have been developed from advanced countries such as Japan and the United States. The trend is.

However, more than 16 kinds of processes are needed for the chemical conversion process, which increases the management cost due to the complex production structure.In order to achieve rapid chemical conversion, the treatment temperature must be set to a high temperature. This may occur in addition.

In addition, the surface treatment technology for improving fuel efficiency due to miniaturization, light weight, and lower viscosity of lubricating oil has become a hot topic in recent years, and it has been dealing with environmental regulations such as energy consumption and CO ₂ reduction, RoHS, ELV and WEEE and pollutants. It is necessary to develop eco-friendly surface treatment technology such as environmental protection and energy efficiency.

Moreover, environmentally friendly surface treatment technologies for automotive parts and mechanical parts are being developed in accordance with global environmental regulations, and in particular, the use of surface treatment liquids containing these harmful substances in accordance with strong regulations of Pb, Cd, Hg, Cr ⁺⁶ It has been banned on the whole, and the conventional chromate treatment technology with excellent corrosion resistance and adhesion has been replaced from Cr ⁺⁶ to Cr ⁺³ on the whole, and the development of ternary alloy plating technology and the suppression of CN material due to the regulation of allergen Ni CN free surface treatment techniques are being developed.

For example, Korean Patent No. 10-1739759 discloses 20 to 30% by weight of phosphoric acid, 10 to 15% by weight of first manganese phosphate, 10 to 20% by weight of first zinc phosphate, 1 to 2% by weight of formic acid, and 0.5 to organic solvents. A manganese phosphate chemical coating composition comprising 1 wt%, stabilizer 3 to 6 wt%, and residual amount of water is disclosed.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-described problems, and provides a coating layer having high adhesion and stability on a metal surface, thereby improving wear resistance and corrosion resistance and securing lubricity.

The present invention

Based on 100 parts by weight of distilled water,

Phosphoric acid (H ₃ PO ₄ ) 3 to 6 parts by weight;

1 to 3 parts by weight of manganese carbonate (MnCO ₃ );

0.01 to 0.1 parts by weight of nickel nitrate [Ni (NO ₃ ) ₂ -6H ₂ O];

0.2 to 0.6 parts by weight of ammonium sulfate [(NH ₄ ) ₂ SO ₄ ]; And

It provides a coating composition comprising 3 to 20 parts by weight of molybdenum disulfide (MoS ₂ ).

In addition, the present invention

A polishing step of physically polishing the object surface to clean the surface;

Washing treatment step of washing with water after the polishing step is completed;

A pretreatment step of pretreatment for 10 to 20 minutes with a hydrochloric acid solution of 10 to 20% by volume after the washing step;

Washing treatment step of washing with water after the pretreatment step is completed;

A surface adjustment step of performing surface adjustment for 30 seconds to 1 minute and 30 seconds using the surface conditioner composition after the washing step is completed;

Washing treatment step of washing with water after the surface adjustment step is finished; And

After the washing step is completed, based on 100 parts by weight of distilled water, 3 to 6 parts by weight of phosphoric acid (H ₃ PO ₄ ), 1 to 3 parts by weight of manganese carbonate (MnCO ₃ ), nickel nitrate [Ni (NO ₃ ) ₂ ㅇ 6H ₂ O] 0.01 to 0.1 parts by weight, ammonium sulfate [(NH ₄ ) ₂ SO ₄ ] 0.2 to 0.6 parts by weight, and molybdenum disulfide (MoS ₂ ) 3 to 20 parts by weight of the coating composition comprising a temperature of 95 to 97 ℃ It provides a chemical conversion treatment method comprising the chemical conversion treatment step of chemical conversion for 1 to 5 minutes in the range.

The phosphate composite coating composition for improving lubricity according to the present invention forms a layer of phosphate or oxide compound having high adhesion and stability on the metal surface, thereby improving wear resistance, corrosion resistance and lubricity by using the physical and chemical properties of the surface layer on which the coating is formed. In addition, it is possible to reduce the chemical consumption by reducing the chemical conversion time by the need for additional lubricity improvement work, etc. It is easy to secure the price competitiveness.

Hereinafter, the present invention will be described in detail.

In one aspect, the present invention is based on 100 parts by weight of distilled water, 3 to 6 parts by weight of phosphoric acid (H ₃ PO ₄ ); 1 to 3 parts by weight of manganese carbonate (MnCO ₃ ); 0.01 to 0.1 parts by weight of nickel nitrate [Ni (NO ₃ ) ₂ -6H ₂ O]; 0.2 to 0.6 parts by weight of ammonium sulfate [(NH ₄ ) ₂ SO ₄ ]; And molybdenum disulfide (MoS ₂ ) 3 to 20 parts by weight.

In another aspect, the present invention is a polishing step of physically polishing the target surface to clean; Washing treatment step of washing with water after the polishing step is completed; A pretreatment step of pretreatment for 10 to 20 minutes with a hydrochloric acid solution of 10 to 20% by volume after the washing step; Washing treatment step of washing with water after the pretreatment step is completed; A surface adjustment step of performing surface adjustment for 30 seconds to 1 minute and 30 seconds using the surface conditioner composition after the washing step is completed; Washing treatment step of washing with water after the surface adjustment step is finished; And after completion of the washing step, 100 parts by weight of distilled water, 3 to 6 parts by weight of phosphoric acid (H ₃ PO ₄ ), 1 to 3 parts by weight of manganese carbonate (MnCO ₃ ), nickel nitrate [Ni (NO ₃ ) ₂ ㅇ 6H ₂ O] 0.01 to 0.1 parts by weight, ammonium sulfate [(NH ₄ ) ₂ SO ₄ ] 0.2 to 0.6 parts by weight, and molybdenum disulfide (MoS ₂ ) 3 to 20 parts by weight of a coating agent composition of 95 to 97 ℃ It provides a chemical conversion treatment method comprising the chemical conversion treatment step of chemical conversion for 1 to 5 minutes in the temperature range.

The coating composition according to the present invention, in particular the phosphate composite coating composition for improving the lubricity to form a composite film consisting of Mn-P-MoS ₂ on the material surface to improve the physical properties of the material surface, shorten the chemical conversion treatment time In addition, it can provide lubricity.

Distilled water according to the present invention may be used as long as distilled water commonly used in the art.

The content of the remaining components other than the distilled water constituting the coating composition, in particular the phosphate composite coating composition for improving lubricity is based on 100 parts by weight of distilled water.

Phosphoric acid (H ₃ PO ₄ ) according to the present invention is included in the phosphate composite coating composition to chemically react with the metal surface to be treated to make the surface poorly soluble phosphate to change the unique properties of the metal, such as Any phosphoric acid commonly used in the art for the purpose may be used.

The preferred amount of phosphoric acid is 3 to 6 parts by weight based on 100 parts by weight of distilled water.

Manganese carbonate according to the present invention is a composition used in a conventional coating agent composition, and together with the phosphoric acid to form a manganese phosphate coating layer.

At this time, the manganese carbonate is preferably in the form of a powder, the manganese carbonate in the powder form is affected by the physical properties of the coating layer formed by the coating composition according to the average particle size.

The size of the preferred manganese carbonate powder can be changed according to the user's choice, but is preferably several micrometers, more preferably 5 to 15 micrometers, and preferably about 9 micrometers.

Here, the manganese carbonate powder is preferably prepared by a conventional method in the art, for example, a ball mill method.

At this time, the preferred ball mill method is preferably manufactured using zirconium oxide balls, which are ceramic balls rotating at about 140 rpm.

A preferred amount of manganese carbonate is not particularly limited, but is preferably 1 to 3 parts by weight based on 100 parts by weight of distilled water.

Nickel nitrate [Ni (NO ₃ ) ₂ -6H ₂ O] according to the present invention is a green flaky crystal, which provides nickel to the composite coating composition.

The preferred amount of nickel nitrate is 0.01 to 0.1 parts by weight based on 100 parts by weight of distilled water.

Ammonium sulfate [(NH ₄ ) ₂ SO ₄ ] according to the present invention may be used as long as it is a conventional ammonium sulfate in the art, the amount is preferably 0.2 to 0.6 parts by weight based on 100 parts by weight of distilled water.

Molybdenum disulfide (MoS ₂ ) according to the present invention is intended to improve the lubricity of the coating composition, particularly the phosphate composite coating composition, and is not particularly limited as long as it is a conventional molybdenum disulfide having a purpose in the art.

In particular, the molybdenum disulfide according to the present invention is included in the composite coating composition so that it is possible to add lubricity by only one chemical conversion process to remove the lubricity by secondary coating after conventional manganese phosphate chemical conversion treatment.

The preferred amount of molybdenum disulfide is preferably 3 to 20 parts by weight based on 100 parts by weight of distilled water.

At this time, if the amount of molybdenum disulfide is less than 3 parts by weight can not provide the desired lubricity, if the amount is more than 20 parts by weight there is a problem that it is not economical compared to the increase in lubricity.

The composite coating composition according to the present invention having such a configuration, in particular the phosphate composite coating composition for improving the lubricity improves the lubricity as well as the physical effect that can be obtained in the conventional phosphate coating, more specifically manganese phosphate coating Can be.

The coating composition according to the present invention, in particular, the phosphate composite coating composition for improving lubricity may further include one or more additives of the following specific embodiments.

In a particular embodiment, the composite coating composition according to the present invention, in particular the phosphate composite coating composition for improving lubricity may further comprise 20 to 40 parts by weight of boric acid based on 100 parts by weight of distilled water for pH buffering.

Here, the boric acid has a pH buffering effect in the vicinity of pH 9.0 and has a strong effect on acidic complexes.

In another specific embodiment, the composite coating composition according to the present invention may further include 5 to 20 parts by weight of sodium thiophosphate (NaH ₂ PO ₂ ) based on 100 parts by weight of distilled water in order to reduce metal ions during chemical conversion treatment.

In another specific embodiment, the composite coating composition according to the present invention is to suppress the formation of sludge such as iron oxide through the initial activation reaction of the phosphate coating, and to improve the purity of the metal salt citric acid [HOC (HOC (based on 100 parts by weight) COOH) (CH ₂ COOH) ₂ ] 7 to 25 parts by weight may be further included.

In another specific embodiment, the composite coating composition according to the present invention may further include 1 to 5 parts by weight of a stabilizer based on 100 parts by weight of distilled water in order to improve the stability of the composition.

Preferred stabilizers include propylene glycol; 1,3-dioxolane; Propylene; Or at least one or more mixtures selected from these, but is not limited thereto.

In another specific embodiment, the composite coating agent composition according to the present invention may further include 0.5 to 3 parts by weight of an accelerator based on 100 parts by weight of distilled water in order to more easily form a coating layer formed on the surface of the material.

Herein, the accelerator may be any conventional promoter in the art, but it is preferable to use formic acid, lactic acid, oxalic acid, acetic acid, propionic acid, citraconic acid or at least one mixture thereof.

The coating composition according to the present invention having such a configuration, in particular the phosphate composite coating composition for improving lubricity, is applied to automobiles, machines and / or parts thereof to treat metal surfaces.

Thus, the chemical conversion treatment method using the coating agent composition according to the present invention will be described.

Here, mechanical pretreatment to be described later means polishing, and chemical pretreatment means pretreatment with hydrochloric acid solution.

The chemical conversion treatment method according to the present invention includes a polishing step of physically polishing a target surface to clean it;

Washing treatment step of washing with water after the polishing step is completed;

A pretreatment step of pretreatment for 10 to 20 minutes with a hydrochloric acid solution of 10 to 20% by volume after the washing step;

Washing treatment step of washing with water after the pretreatment step is completed;

A surface adjustment step of performing surface adjustment for 30 seconds to 1 minute and 30 seconds using the surface conditioner composition after the washing step is completed;

Washing treatment step of washing with water after the surface adjustment step is finished; And

After the washing step is completed, based on 100 parts by weight of distilled water, 3 to 6 parts by weight of phosphoric acid (H ₃ PO ₄ ), 1 to 3 parts by weight of manganese carbonate (MnCO ₃ ), nickel nitrate [Ni (NO ₃ ) ₂ ㅇ 6H ₂ O] 0.01 to 0.1 parts by weight, ammonium sulfate [(NH ₄ ) ₂ SO ₄ ] 0.2 to 0.6 parts by weight, and molybdenum disulfide (MoS ₂ ) 3 to 20 parts by weight of the coating composition comprising a temperature of 95 to 97 ℃ A chemical conversion treatment step of chemical conversion for 1 to 5 minutes in the range.

The polishing step according to the present invention is for physically removing contaminants such as dust and dirt from metal surfaces to be treated, particularly metal surfaces applied to automobile parts and / or articles. Any physical method may be used as long as it is a conventional physical method in the industry, but sandpaper, particularly silica sandpaper, is preferably used.

The pretreatment step according to the present invention is to improve the cleanliness of the metal surface to be treated so that the surface adjustment and the formation of the chemical conversion coating are uniform and have good adhesion. Although it may be used, it is preferable to pre-treat 10 to 20 minutes with hydrochloric acid solution of 10 to 20% by volume, preferably about 15 minutes.

In a particular aspect, the pretreatment step according to the present invention may further comprise sequentially performing degreasing, etching and dismuting.

Here, the degreasing can completely remove the contaminants such as oxides, hydroxides, metal salts and / or fats and oils adhered to the metal surface, in particular metal surfaces for automobile parts and / or articles, and adhere to the metal surface, resulting in poor adhesion, swelling, This is to prevent the occurrence of defects such as corrosion.

Preferred degreasing may be used as long as the degreasing liquid is used to degrease metals, particularly alloys for automobile parts.

Preferred degreasing method may include an ultrasonic degreasing method using ultrasonic waves, more preferably, ultrasonic degreasing by depositing the metal in the degreasing solution maintained at a temperature range of 50 to 100 ℃ for 3 to 10 minutes.

In this case, the ultrasonic degreasing method using the ultrasonic wave can completely remove oil penetrating into the gap of the material made of metal.

In addition, when the degreasing time is less than 3 minutes, the oil penetrated into the fine gap of the material during processing may remain oily denaturation formed on the surface, and if the degreasing time exceeds 10 minutes, the fatigue of the material There is a problem that the foreign matter coming into the degreasing liquid is attached to the surface of the material is contaminated again to increase.

The degreasing liquid may be used as long as it is a conventional degreasing liquid, but preferably 1 to 3% by weight of sodium hydroxide (NaOH) based on the total weight of the degreasing liquid (100% by weight in total); Sodium carbonate (Na 2 CO 3) 1.5 to 4% by weight, 0.001 to 0.01% by weight of surfactant and 93 to 97% by weight of distilled water may be included.

Here, the surfactant may be any of nonionic, cationic and anionic surfactants.

Preferred surfactants include cocoamidopropyl betaine, lauryl betaine, capryl / capryamide betaine, mono alkyl phosphate, ethoxylated mono alkyl phosphate, alkylbenzene sulfonate or mixtures of at least one selected from these May be used, but is not limited thereto.

The etching according to the present invention is intended to prevent deterioration of the adhesion of the plating because the thin oxide film and the passivation film remain on the surface of the material, for example, the metal material after degreasing.

In particular, the etching dissolves and removes light contaminants such as machine oil and cutting oil that may remain in degreasing, and outermost surface layers such as an oxide film and a passivation film, and neutralizes alkalis remaining on the surface of a material, eg, a magnesium alloy material. The hydroxide layer formed during degreasing can be removed.

Preferred etching methods include treating the finished metal with an etchant for 2 to 10 minutes in a temperature range of 50 to 100 ° C.

Although the etching solution is not particularly limited, it is preferable to include NH ₄ HF 3 to 8% by weight, NH ₄ OH 3 to 8% by weight and distilled water 84 to 94% by weight based on the total weight of the etching solution.

The dismut according to the present invention is used to reduce the surface tension between the metal and the plating liquid to enhance the adhesion of the plating film.

Preferred dispersants include treatment of the etched metals with dispersant for 10 to 60 seconds in a temperature range of 50 to 100 ° C.

The dispersant is not particularly limited, but is preferably based on the total weight of the dispersant, sodium hydroxide (NaOH) 5-10% by weight, sodium fluoride (NaF) 0.1-1% by weight, C4H6O6 0.1-2.5% % And 87 to 93% by weight of distilled water.

In the surface adjustment step according to the present invention Mn-P-MoS after the surface adjustment by adding a fine manganese powder to promote the active point (nucleation) by making small and dense crystals on the surface of the metal material to be treated using the surface modifier composition _{2 The} film is intended to shorten the chemical conversion time of the film by making the crystal fine, dense and uniform, and may be used as long as it is a surface adjustment step having this purpose.

Here, as an example of the surface modifier composition used in the surface adjustment step, the composition is based on 100 parts by weight of water, 0.3 to 0.5 parts by weight of manganese dihydrogen phosphate [Mn (H ₂ PO 4) ₂ ]; 0.5 to 1.5 parts by weight of sodium triphosphate [Na ₅ P ₃ O ₁₀ ], 0.5 to 1.5 parts by weight of sodium pyrophosphate [Na ₄ P ₂ O ₇ ]; And / or 1 to 3 parts by weight of sodium hexametaphosphate [(NaPO ₃ ) ₆ ].

As a specific embodiment, the chemical conversion treatment method using the coating composition, specifically the phosphate composite coating composition according to the present invention may further include a drying step of drying the treated metal after the chemical conversion treatment step is completed.

At this time, the drying step may be used any drying method commonly used in the art.

Preferably hot air drying, more preferably it is preferable to use a hot air drying method made for 5 to 15 minutes in the temperature range of 120 to 180 ℃.

On the other hand, the chemical conversion treatment method according to the present invention includes a washing step of washing with water to the rear end of each step, the washing step is removed from the metal surface to be treated, such as the solution or impurities used during each step Used to

Hereinafter, the present invention will be described in detail through examples. However, the following examples are only for illustrating the present invention in detail and do not limit the scope of the present invention by these examples.

Example 1

1000 g (1 L) of distilled water, 45 g of phosphoric acid, 20 g of manganese carbonate, 5 g of nickel nitrate, 4 g of ammonium sulfate, and 120 g of molybdenum disulfide were mixed and mixed to prepare a coating composition.

Example 2

The same procedure as in Example 1 was carried out except that 300 g of boric acid was further added.

Example 3

The same procedure as in Example 1 was carried out, with the addition of 100 g of sodium phosphate.

Example 4

The same procedure as in Example 1 was conducted except that 150 g of citric acid was further added.

Example 5

The same procedure as in Example 1 was carried out except that 30 g of propylene glycol was further added.

Example 6

The same procedure as in Example 1 was carried out except that 20 g of oxalic acid was added.

Example 7

The same method as in Example 1 was carried out except that Examples 2 to 6 were all added.

Example 8

SM45C, which is mainly used for automobile parts, was processed to φ4.5X2mmT size, and then the surface was polished cleanly with sandpaper.

The polished metal was then washed with water.

Then, the washed metal was pretreated with 15 vol% hydrochloric acid solution for about 15 minutes and washed with water.

Then, the metal washed after pretreatment was about 1 minute using a surface conditioner composition prepared by mixing 1000 g (1 L) of distilled water, 4 g of manganese dihydrogen phosphate, 10 g of sodium triphosphate, 10 g of sodium pyrophosphate, and 20 g of sodium hexamethaphosphate. Surface treated and washed with water.

Then, the chemical treatment solution prepared according to Example 1 of distilled water was chemically treated at about 96 ° C. for about 3 minutes, and then washed with water.

Example 9

The same method as in Example 8 was carried out, except that the chemical treatment solution prepared according to Example 2 was used instead of the chemical conversion solution prepared according to Example 1.

Example 10

The same process as in Example 8 was carried out, except that the chemical treatment solution prepared according to Example 3 was used instead of the chemical conversion solution prepared according to Example 1.

Example 11

It was carried out in the same manner as in Example 8, but using the chemical conversion treatment prepared in Example 4 instead of the chemical conversion treatment prepared according to Example 1.

Example 12

The same procedure as in Example 8 was carried out, except that the chemical treatment solution prepared according to Example 5 was used instead of the chemical conversion solution prepared according to Example 1.

Example 13

The same procedure as in Example 8 was carried out, except that the chemical treatment solution prepared according to Example 6 was used instead of the chemical conversion solution prepared according to Example 1.

Example 14

The same procedure as in Example 8 was carried out, except that the chemical treatment solution prepared according to Example 7 was used instead of the chemical conversion solution prepared according to Example 1.

Example 15

The same method as in Example 8 was carried out, but as the pretreatment step, pretreatment with 15 vol% hydrochloric acid solution for about 15 minutes, NaOH 15g, 22g Na ₂ CO ₃ , 0.05ml of a surfactant containing mono alkyl phosphate and the rest 1000 g of the degreasing solution prepared by mixing distilled water was deposited and sonicated for about 5 minutes to perform degreasing.

Example 16

An etching solution prepared in the same manner as in Example 15, but pretreated with 15% by volume of hydrochloric acid for 15 minutes at the end of the degreasing step as a pretreatment step, and then mixed with NH ₄ HF 50g, NH ₄ OH 50g and distilled water 900g. Etching was performed for about 5 minutes at a temperature of about 70 ℃.

Example 17

Perform the same method as in Example 16, but pretreatment with 15% by volume hydrochloric acid solution at the end of the etching step as a pretreatment step for about 15 minutes and then mixed NaOH 80g, NaF 5g, C ₄ H ₆ O ₆ 15g and distilled water 900g It was carried out by further comprising the step of dispersing for about 30 seconds at a temperature of about 70 ℃ with the prepared dispersant.

[Experiment]

The physical properties of the chemically treated metals according to Examples 8 to 17, for example, surface roughness, coefficient of friction, thickness of the coating layer, and the like were measured and shown in Table 1 below.

Here, the metal material was wiped with a cloth and then dried with a hand dryer for 1 minute, and then the metal surface was observed using a three-dimensional measuring instrument (Nanosystem, Korea, NV-3000).

Referring to Table 1 below, the parameter variables of Ra, Rq, Rt, and Rz are parameters representing average roughness, maximum height roughness, average roughness, and root mean square roughness, respectively.

Surface Roughness, Ra (㎛) Coefficient of friction Coating layer thickness (㎛) Example 8 0.476 0.07 9.1 Example 9 0.471 0.1 9.4 Example 10 0.475 0.08 8.6 Example 11 0.476 0.07 9.6 Example 12 0.469 0.12 9.7 Example 13 0.475 0.11 9.6 Example 14 0.473 0.10 9.5 Example 15 0.475 0.09 9.3 Example 16 0.471 0.08 9.3 Example 17 0.472 0.098 9.4

As shown in Table 1, Examples 8 to 17 converted to a phosphate composite coating composition for improving the lubricity according to the present invention has a low lubricity of the metal surface after coating and a low coefficient of friction, the lubricity is good. there was.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it should be understood that the embodiments described above are all illustrative and not restrictive. The scope of the present invention should be construed as being included in the scope of the present invention all changes or modifications derived from the meaning and scope of the appended claims rather than the detailed description and equivalent concepts thereof.

Claims (3)

Based on 100 parts by weight of distilled water,
Phosphoric acid (H ₃ PO ₄ ) 3 to 6 parts by weight;
1 to 3 parts by weight of manganese carbonate (MnCO ₃ );
0.01 to 0.1 parts by weight of nickel nitrate [Ni (NO ₃ ) ₂ -6H ₂ O];
0.2 to 0.6 parts by weight of ammonium sulfate [(NH ₄ ) ₂ SO ₄ ]; And
Molybdenum disulfide (MoS ₂ ) A coating composition comprising 3 to 20 parts by weight.
A polishing step of physically polishing the object surface to clean the surface;
Washing treatment step of washing with water after the polishing step is completed;
A pretreatment step of pretreatment for 10 to 20 minutes with a hydrochloric acid solution of 10 to 20% by volume after the washing step;
Washing treatment step of washing with water after the pretreatment step is completed;
A surface adjustment step of performing surface adjustment for 30 seconds to 1 minute and 30 seconds using the surface conditioner composition after the washing step is completed;
Washing treatment step of washing with water after the surface adjustment step is finished; And
After the washing step is completed, based on 100 parts by weight of distilled water, 3 to 6 parts by weight of phosphoric acid (H ₃ PO ₄ ), 1 to 3 parts by weight of manganese carbonate (MnCO ₃ ), nickel nitrate [Ni (NO ₃ ) ₂ ㅇ 6H ₂ O] 0.01 to 0.1 parts by weight, ammonium sulfate [(NH ₄ ) ₂ SO ₄ ] 0.2 to 0.6 parts by weight, and molybdenum disulfide (MoS ₂ ) 3 to 20 parts by weight of the coating composition comprising a temperature of 95 to 97 ℃ Chemical conversion treatment comprising the chemical conversion treatment step of chemical conversion for 1 to 5 minutes in the range.
The method of claim 2,
And a drying step of hot-drying the treated metal after 5 to 15 minutes at 120 to 180 ° C. after the chemical conversion treatment step is completed.