KR102064583B1 - Amorphous alloy powder exhibiting corrosion and wear resistance properties, manufactruing method thereof - Google Patents

Abstract

The present invention relates to alloy powder having excellent corrosion resistance, a method for producing the powder, a coating method using the powder, and a method for producing parts. More specifically, the alloy powder is amorphous alloy powder. The alloy powder includes 8 wt% of nickel, 5 wt% of molybdenum, 25 wt% of chromium, 11-14 wt% of phosphorus, 2.5 wt% of boron, 2 wt% of carbon, 2 wt% of silicon, and the remainder of iron, wherein the particle average diameter of the alloy powder is 20 to 80 μm and the aspect ratio of the particle is 1 to 1.2. According to the present invention, the components of the alloy powder based on iron can be strictly controlled so that the corrosion resistance of the alloy powder can be significantly increased. In addition, the alloy powder can be used to coat the surfaces of structures, hulls, parts or materials exposed to seawater, or can be used as a material for parts requiring resistance to corrosion and acids.

Description

Alloy powder having excellent corrosion resistance and manufacturing method of alloy powder {AMORPHOUS ALLOY POWDER EXHIBITING CORROSION AND WEAR RESISTANCE PROPERTIES, MANUFACTRUING METHOD THEREOF}

The present invention relates to an alloy powder having excellent corrosion resistance, a method for producing the powder, a coating method using the powder, and a method for manufacturing a part. More specifically, based on iron (Fe), phosphorus (P) and molybdenum (Mo) ), Chromium (Cr), boron (B), nickel (Ni), silicon (Si), carbon (C), etc. are formed into a powder having corrosion resistance by a strict composition, and coated on the surface of the base material, or It relates to a method for manufacturing a part using.

It is no exaggeration to say that structures exposed to seawater, various materials, hulls and various components requiring acid resistance are exposed to severe corrosive environments. As described above, various methods are used to prevent corrosion in structures, various materials, hulls, and parts requiring acid resistance under severe corrosive environments.

As a method for preventing the corrosion, there is a method of forming a corrosion-resistant coating layer on the surface of a structure, various materials, and various components requiring acid resistance using a thermal spraying method, a method of using corrosion-resistant and anti-rust paint, and the like.

As a method of forming a corrosion resistant coating layer using a thermal spraying method, a coating layer is formed using zinc powder to protect various structures, materials, hulls and parts from seawater. It is becoming.

In order to solve this problem, in Korean Patent Application Publication No. 10-2013-0039995, 'Polishing zinc powder for excellent corrosion resistance, zinc powder coating method and zinc powder coated steel sheet' phosphoric acid compound, phosphonic acid compound, carboxyl group-containing compound In order to use the zinc powder surface-modified by at least one compound among the azole compound, the silane compound and the organic amine compound, there is a disadvantage in that it must be resprayed after a certain period of time because of its long duration.

In addition, the method using corrosion and rust preventive paint has to be repainted continuously because the corrosion and rust prevention period after coating is about 6 months, and it is manufactured by adding various chemical solvents, additives, and resins. There is a risk of environmental pollution.

In order to prevent this, in Korean Patent Application Publication No. 10-2003-0026784, 'Ceramic Antirust Paint Manufacturing Method' includes acrylic resins, vinyl resins alone or mixed resins, purified water, waste ceramic powder, ceramic powder, inorganic material powder, inorganic pigment, By providing a coating film paint composition using an anionic surfactant or the like, to prevent the environmental pollution is caused, but also has a disadvantage in that the continuous maintenance is required due to the short duration.

And in the shipbuilding equipment industry, some parts to prevent corrosion by seawater through an expensive epoxy coating, but because the cost is too expensive, it is difficult to apply the epoxy coating in various fields.

Accordingly, the present inventors proposed the 'coating composition having excellent corrosion resistance and its coating method' of Korean Patent Registration No. 10-1414185 to improve the corrosion resistance by strictly controlling the components of the coating composition based on iron.

Corrosion resistance, on the other hand, is required for materials of powder metallurgy industrial parts as well as coating compositions.

Accordingly, the present inventors propose not only coating compositions but also alloy powders that can be used as various industrial materials.

KR 10-2013-0039995 A KR 10-2003-0026784 A KR 10-1414185 B1

An object of the present invention is to produce an alloy powder having excellent corrosion resistance by adjusting the composition of phosphorus (P), molybdenum (Mo), chromium (Cr), boron (B), nickel (Ni) and the like based on iron (Fe) And, using this to form a coating layer excellent in corrosion resistance or to manufacture a variety of industrial component materials.

According to an embodiment of the present invention, as an amorphous alloy powder, the alloy powder, nickel 8wt%, molybdenum 5wt%, chromium 25wt%, phosphorus 11-14 wt%, boron 2.5wt%, carbon 2wt%, silicon 2wt% All and the balance of iron, the nickel 8wt% or 15wt%, molybdenum 5wt% and chromium 25wt% improve the corrosion resistance of the alloy powder, 25wt% chromium increases the acid resistance of the alloy powder , The average particle diameter of the alloy powder is 20 ~ 80㎛, the aspect ratio of the particle is 1 ~ 1.2, the alloy powder, High-Velocity Oxygen Fuel Spraying (HVOF), electric arc spraying (Arc Spraying) It is applied to the raw powder for any one of the coating process of the coating process by mixing with the plasma spray and the solvent, it can provide an alloy powder having excellent corrosion resistance, characterized in that applied to the powder metallurgy material.

According to the present invention, by strictly controlling the components of the alloy powder based on iron, there is an advantage that the corrosion resistance of the alloy powder is significantly improved. In addition, using the alloy powder there is an advantage that can be used as a material of the parts, the surface of the structure, hull, parts or materials exposed to seawater, or corrosion resistance exposed to acid resistance is required.

1 is a manufacturing process of the alloy powder according to an embodiment of the present invention.
2 is an Xrd analysis of Example 1 according to the present invention.
Figure 3 is a photograph showing the results of the saline test of Example 1 according to the present invention.
4 is a DSC analysis result of Example 1 according to the present invention.
Figure 5 is a photograph showing the corrosion resistance test results by the etching of Example 1 according to the present invention.
Figure 6 is a photograph of the surface before, after forming a coating layer on the base material using Example 1 according to the present invention.
Figure 7 is a cross-sectional photograph after forming a coating layer on the base material using Example 1 according to the present invention.
Figure 8 is a photograph showing the results of the salt spray test of the coating layer formed using Example 1 according to the present invention.
Figure 9 is a photograph showing the results of the acid resistance test of the coating layer formed using Example 1 according to the present invention.
Figure 10 is a photograph showing the results of the acid resistance immersion test of sulfuric acid of the coating layer formed using Example 1 according to the present invention.
11 is a photograph showing the results of testing the acid resistance of the sample according to Example 2 of the present invention.
12 is a cross-sectional photograph of the resultant according to Example 1 and Example 2 according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The alloy powder according to the present invention is based on iron and has excellent corrosion resistance, and can be mass-produced, while having high price competitiveness, and excellent physical properties, which are applied as a coating composition to coat various industrial base materials. Of course, it is characterized by the powder metallurgy to be able to manufacture various industrial parts directly.

More specifically, the alloy powder having excellent corrosion resistance of the present invention is an amorphous alloy powder, the alloy powder is nickel (Ni) 8wt%, molybdenum (Mo) 5wt%, chromium (Cr) 25wt%, phosphorus (P ) 11-14 wt%, boron (B) 2.5wt%, silicon (Si) 2wt%, carbon (C) 2wt% and the balance of iron, the average particle diameter of the alloy powder is 20 ~ 80㎛, particles The aspect ratio of is characterized in that 1 ~ 1.2. Alternatively, the alloy powder includes 15 wt% nickel, 5 wt% molybdenum, 25 wt% chromium, 11-14 wt% phosphorus, 2.5 wt% boron, 2 wt% silicon, 2 wt% carbon, 5 wt% cobalt (Co), and the balance of iron. The average particle diameter of the alloy powder is 20 to 80 µm, and the aspect ratio of the particles is 1 to 1.2.

That is, the present invention is to suppress the corrosion in various environments based on iron, and to improve the corrosion resistance by adding nickel, molybdenum, chromium, phosphorus, boron and the like to iron.

First, each component element constituting the alloy powder according to the present invention will be described in detail.

The iron (Fe) to facilitate the interaction with other alloy additives in the alloy powder as well as to secure a price competitiveness, in the present invention was used as the main iron.

The nickel (Ni) is an effective element included in the alloy to improve the strength. When the nickel content is less than 8wt%, such an effect is weak, so it is preferable to use as much as 8wt% or 15wt% in the embodiment of the present invention.

Molybdenum (Mo) is an element contributing to the improvement of corrosion resistance and strength, molybdenum prevents the penetration of chlorine (Cl) ions. When the molybdenum is included in less than 5wt% it is difficult to show the effect, if it exceeds 5wt% excess molybdenum can form a precipitate rather increase the corrosion rate, in the embodiment of the present invention by 5wt% It is preferable to use.

The chromium (Cr) is a main element for increasing the corrosion resistance of the alloy powder, it can act to form a stable coating layer. According to the embodiment of the present invention, when the chromium is used at 25wt%, a preferable result for improving the corrosion resistance could be obtained.

Phosphorus (P) is an element that increases the physical properties of the alloy powder, and more specifically, the main element that increases the adhesion between the powder. The phosphorus does not play such a role when a small amount is added, and when the excessive amount is added, the physical property of the coating layer is lowered.

Boron (B) is an element for improving composition preservation of molten steel, and when it is added at less than 2 wt%, it is difficult to secure sufficient strength, so it is preferable to use 2.5 wt% in the embodiment of the present invention.

The silicon (Si) is an element added to improve physical properties (fluidity), and can significantly improve the physical properties of the material. When the silicon content is less than 2wt%, the effect is insignificant, so it is preferable to use 2wt% in the embodiment of the present invention.

In addition, to improve the strength of the alloy powder according to an embodiment of the present invention, carbon (C) may be added. The carbon is preferably added in a content of 2wt%, because when the carbon content is less than 2wt%, it is difficult to secure the strength.

The alloy powder of the present invention having the above composition is an amorphous powder, and is effective in improving corrosion resistance due to the strict composition. Therefore, as a coating composition of structures, ships or their parts and materials vulnerable to acid resistance, it is possible to reduce maintenance costs and to extend the service life. In addition, it can be utilized as a material for powder metallurgy, not a coating composition, and thus can be utilized in various industries.

In addition, the alloy powder according to the present invention, the average particle diameter of the powder is 20 ~ 80㎛, it is preferable that the aspect ratio of the particle is 1 ~ 1.2, which is difficult to manufacture the alloy powder when the average particle diameter is smaller than 20㎛ If it is larger than 80㎛, since it adversely affects the physical properties such as pores are formed in the coating layer or the manufactured part, it is preferable to have a diameter of 20 ~ 80㎛. In addition, since the particles of the alloy powder are closer to the spherical shape, it is advantageous to form an even coating layer and the surface, and the aspect ratio is most preferably about 1 to 1.2.

The alloy powder of the present invention configured as described above is applied as a raw material powder for any one of high-speed flame spraying (High-Velocity Oxygen Fuel Spraying, HVOF), electric arc spraying and plasma spraying, coating of the base material May be coated on the surface.

In addition, the alloy powder of the present invention is applied as a raw material powder of the process of mixing and coating the solvent and the alloy powder, it may be coated on the surface of the base material.

In addition, the alloy powder of the present invention may be used as a material for powder metallurgy to be produced in various industrial parts.

Hereinafter, a method of manufacturing the alloy powder as described above will be described in detail with reference to FIG. 1.

Injecting iron, nickel, molybdenum, chromium, phosphorus, boron, carbon and silicon into the melting furnace to melt into molten steel.

First, iron, nickel, molybdenum, chromium, phosphorus, boron, carbon and silicon, which are the main member elements of the alloy powder according to the present invention, are prepared in accordance with each component ratio, and then they are introduced into a melting furnace. Here, since the component ratio between the above elements is sufficiently described in describing the alloy powder, the description thereof is omitted.

Next, iron, nickel, molybdenum, chromium, phosphorus, boron, carbon, and silicon introduced into the melting furnace are heated and melted. Here, the heating temperature is preferably to be 1,050 ~ 1,350 ℃, it is difficult to melt when the temperature is lower than 1,050 ℃, and when the temperature is higher than 1,350 ℃ is heated to 1,050 ~ 1,350 ℃.

At this time, by selectively adding boron oxide (Boron Oxide) to cover the surface of iron, nickel, molybdenum, chromium, phosphorus, boron, carbon and silicon with boron oxide, and then heat it, the boron oxide is molten steel Prevents oxidation in the atmosphere.

In the present invention, the input amount of the boron oxide is sufficient to be added so that the heated iron, nickel, molybdenum, chromium, phosphorus, boron, carbon and silicon is covered, the amount is not limited. For example, the volume ratio of iron, nickel, molybdenum, chromium, phosphorus, boron, carbon, and boron: boron oxide may be added at a ratio of 1: 1 to 2.

In addition, since the boron oxide is for preventing oxidation, it is added after heating iron, nickel, molybdenum, chromium, phosphorus, boron, carbon and silicon.

In manufacturing the alloy powder according to an embodiment of the present invention, when melting with molten steel, vacuum molten steel may be used.

Tapping the molten steel with a tundish with an orifice in the lower portion.

The molten steel is then tapped with a tundish having an orifice mounted thereon. Since the orifice and the tundish are already known in the art to which the art belongs, the description of the shape and structure of the orifice and the tundish is omitted.

Manufacturing an alloy powder by colliding high-speed gas while flowing molten steel in the tundish into an orifice.

Next, while spraying molten steel in the tundish to the orifice to collide with a high-speed gas to spray-dry to prepare an alloy powder. At this time, the average diameter of the spray-dried particles is 20 ~ 80㎛, the aspect ratio of the particles to be 1 ~ 1.2.

The manufacturing conditions of the alloy powder is preferably nitrogen pressure 15 ~ 20Bar, the flow rate of molten steel 15 ~ 20kg / min, the diameter of the orifice Ø 4 ~ 6mm. This is to manufacture the amorphous alloy powder by limiting the above manufacturing conditions.

The alloy powder prepared as described above has not only excellent corrosion resistance but also excellent physical properties such as adhesive performance.

And the alloy powder prepared as described above may be used as a coating composition.

That is, by coating the prepared alloy powder on the surface of the base material, it is possible to form a coating layer excellent in corrosion resistance.

That is, the alloy powder prepared as described above is to be coated on the surface of the structure or other materials, ships, parts and the like that may be corroded. In this case, the coating method may be a spray coating method, and any one of high-speed flame spraying (HVOF), electric arc spraying, and plasma spraying may be used.

At this time, the gas used in the thermal spray coating is a mixed gas mixed with oxygen and nitrogen in a 1: 1 weight ratio, and the injection speed is to form a film at a temperature of 950 ~ 1,020 ℃ at a rate of 35 ~ 80 m / sec It is preferable. At this time, if the speed is too low or high, it is difficult to form a uniform coating. If the spraying temperature is less than 950 ° C, a non-uniform coating layer is formed, and if it is higher than 1,020 ° C, excessive energy is required.

And the thickness of the coating layer is not limited, can be used to adjust as needed. The thickness of the coating layer can be, for example, 20 ~ 500㎛.

In addition, a coating layer may be formed using a method of mixing the solvent and the alloy powder, and coating the same, instead of the thermal spray coating by the coating method. At this time, the type of the solvent is not limited, and the number of coatings is also not limited.

According to the coating method as described above, due to corrosion or acid-resistant base material, it is possible to significantly reduce the additional cost required for respray.

Coating method using the alloy powder of the present invention, the present invention is applied to the hull (Hull, Desk) and ballast tank, etc. in the shipbuilding industry, to extend the service life of the ship, and unnecessary time during regular dry docking (Dry docking) By reducing, it helps not only to operate the ship efficiently but also to apply to many parts or materials used in shipbuilding equipment industry, thus extending the service life of ship's safety parts and materials. In addition, it can also be applied to seawater contact tanks, reservoirs, pipes, etc. in seawater engineering plants, steelmaking and steel pipes, steel structure manufacturing industry, heat exchangers and fuel feed pipes of power plants (fire and nuclear power), It is also applicable to boiler water pipes. In addition, it can be applied to the wind power equipment industry, plants and factories that use a lot of chemicals, and equipment and pipe for mining crude oil in the oil refining industry.

On the other hand, the alloy powder according to the present invention can be used as a material of various industrial parts, in particular, it can produce a variety of parts by the powder metallurgy method. At this time, the part is not limited to the kind, and if it can be produced by the powder metallurgy method, it is natural to include all known various parts.

Hereinafter, the present invention will be described in detail through examples.

(Example 1)

Prepare the material so that 8wt% nickel, 5wt% molybdenum, 25wt% chromium, 11-14wt% phosphorus, 2.5wt% boron, 2wt% silicon, 2wt% carbon and the balance iron. When the material is ready, it is put into a melting furnace, which is heated to 1,200 ° C and melted. The molten steel is then tapped into a tundish equipped with an orifice, and the nitrogen pressure of the gas nozzle is 20 Bar, the flow rate of the molten steel is 15 kg / min, the diameter of the orifice is Ø5 mm, and the gas is sprayed so that the cooling rate is sharply lowered. The average diameter of was 53-106 micrometers, and it manufactured so that the aspect ratio of particle | grains might be 1-1.3.

Xrd Analysis

The alloy powder of Example 1 was xrd analyzed and the results are shown in FIG. 2.

As shown in FIG. 2, Example 1 exhibited an amorphous crystalline state.

Saline testing

The brine test of Example 1 was carried out. In the saline test, the powder of Example 1 was immersed in 5% aqueous sodium chloride solution, and then corrosion was observed. And SUS 304 piece was used as a control. The results are shown in FIG. 3.

As shown in FIG. 3, the alloy powder of Example 1 was not observed at all even after 5,300 hours, but the control group SUS 304 piece was confirmed to have a large amount of corrosion in 100 hours.

Property measurement

The physical properties of the alloy powder according to Example 1 were measured. Stainless steel, titanium, and aluminum powder were used as controls. And the results are shown in Table 1 below.

Physical property measurement result division Yield / Strength
(Mpa) Density
(g / cc) Strength / Density Hardness
(Vickers) Example 1 1,900 6.1 310 896 Stainless steel 840 7.8 107 350 Titanium 770 4.5 170 350 Aluminum 245 2.7 90 150

As shown in Table 1, the alloy powder of Example 1 was confirmed to have excellent strength and hardness compared to the control.

Section Hardness Measurement

The cross-sectional hardness of the alloy powder according to Example 1 was measured, and the results are shown in Table 2 below.

Section hardness measurement result Count Hardness value (Hv) One 862 2 923 3 902 4 862 5 882 6 910 7 808 8 967 9 920 10 923 Value 967 Minimum value 808 Average 896

As shown in Table 2, it was confirmed that the alloy powder according to the present invention has excellent cross-sectional hardness.

DSC analysis

DSC powder analysis of the alloy powder according to Example 1, the results are shown in FIG.

As shown in Figure 4, it was confirmed that there is a change in heat flow around about 510 ℃ and 1,000 ℃.

Corrosion Resistance Test by Etching

The alloy powder according to Example 1 was etched and tested for corrosion by NITAL. The results are shown in FIG. 5.

As can be seen in Figure 5, it was confirmed that the corrosion by the etching of the alloy powder according to Example 1 was not observed.

Component Dissolution Test of Coating Layer

The alloy powder according to Example 1 was thermally spray coated on the surface of the base material. At this time, as a thermal spraying method, the HOVF thermal spraying method was used, and a film was formed on the surface by spraying at 950 ° C. at an injection speed of 60 m / sec using a mixed gas of oxygen and nitrogen mixed in a 1: 1 weight ratio. The thickness of the said coating was 200 micrometers. Here, as the base material, an aluminum base material having a thickness of 2T was used.

6 is a photograph of the surface before and after the thermal spraying of the base material, and FIG. 7 is a cross-sectional photograph after forming the coating layer of the base material and confirmed that the coating layer was stably formed.

The specimen was immersed in 1 L of tap water at room temperature, and after 1 week, the dissolution test was performed by analyzing the components of the solution. And the results are shown in Table 3 and Table 4 (PPB analysis). Al 6061 and SUS 304 were used as a control. The test was conducted by the Pohang Institute of Industrial Science.

Component Dissolution Test Result (Unit: ppm) Sample name tap water Example 1 Al 6061 SUS 304 B 0.87 0.67 - - Mg 4.4 - 4.5 - Al <0.1 0.57 0.36 - Si 9.1 - 6.6 8.8 P <0.1 <0.1 - <0.1 S 30 - - 30.5 Cr <0.1 <0.1 <0.1 <0.1 Mn <0.1 - <0.1 <0.1 Fe <0.1 <0.1 <0.1 <0.1 Ni <0.1 <0.1 - <0.1 Cu <0.1 - <0.1 - Zn <0.1 - <0.1 - Mo <0.1 <0.1 - -

Component Dissolution Test Results (PPB Analysis) (Unit: ppb) Sample name tap water Example 1 Al 6061 SUS 304 P <10 <10 - <10 Cr <10 <10 <10 <10 Mn <10 <10 <10 <10 Fe <10 <10 <10 <10 Ni <10 <10 - <10 Cu <10 - <10 - Zn <10 - <10 - Mo <10 - - -

As in Tables 3 and 4, the coating layer according to the present invention was confirmed that only the Al component by the base material was detected, there is no dissolution by the powder component.

Salt Spray Test for Coating Layers

The alloy powder according to Example 1 was thermally spray coated on the surface of the base material. At this time, as a thermal spraying method, the HOVF thermal spraying method was used, and a film was formed on the surface by spraying at 950 ° C. at an injection speed of 60 m / sec using a mixed gas of oxygen and nitrogen mixed in a 1: 1 weight ratio. The thickness of the said coating was 200 micrometers. Here, as the base material, an aluminum base material having a thickness of 2T was used.

The coating layer was sprayed with 5% aqueous sodium chloride solution to test for corrosion. SUS 304 and SUS 316 specimens were used as a control. The test was conducted by the Pohang Institute of Industrial Science.

As a result, as shown in FIG. 8, the SUS 304 and the SUS 316 specimens, which were the control group at the time of day 23, were observed for corrosion on the front surface, but the specimens according to Example 1 of the present invention were confirmed that the corrosion did not proceed.

Acid resistance test for coating layer

The alloy powder according to Example 1 was thermally spray coated on the surface of the base material. At this time, as a thermal spraying method, the HOVF thermal spraying method was used, and a film was formed on the surface by spraying at 950 ° C. at an injection speed of 60 m / sec using a mixed gas of oxygen and nitrogen mixed in a 1: 1 weight ratio. The thickness of the said coating was 200 micrometers. Here, as the base material, a sample of SUS 304 material, as shown in FIG. 9, was used.

The acid resistance of the samples was tested using 68% nitric acid (HNO ₃ ), 98% sulfuric acid (H ₂ SO ₄ ), 35% hydrochloric acid (HCl) and 98% aqua regia. The acid resistance test contained 20 ml of each acid in the sample to check whether corrosion occurred after 30 minutes. And the result is shown in FIG.

As can be seen in Figure 9, the coating layer according to Example 1 of the present invention was confirmed that the excellent acid resistance.

(Example 2)

15 wt% nickel, 5 wt% molybdenum, 25 wt% chromium, 11-14 wt% phosphorus, 2.5 wt% boron, 2 wt% silicon, 2 wt% carbon, 5 wt% cobalt (Co), and the balance to prepare the material. When the material is prepared, the material is introduced into the melting furnace, which is heated to 1,200 ° C. to melt. The molten steel is then tapped into a tundish equipped with an orifice, and the nitrogen pressure of the gas nozzle is 20 Bar, the flow rate of the molten steel is 15 kg / min, the diameter of the orifice is Ø5 mm, and the gas is sprayed so that the cooling rate is sharply lowered. The average diameter of was 53-106 micrometers, and it manufactured so that the aspect ratio of particle | grains might be 1-1.3.

Acid resistance test for coating layer

The alloy powder according to Example 2 was thermally spray coated on the surface of the base material. At this time, as a thermal spraying method, a HOVF thermal spraying method was used, and a mixed gas mixed with oxygen and nitrogen in a 1: 1 weight ratio was sprayed at 1,500 ° C. at an injection speed of 60 m / sec to form a film on the surface. The thickness of the said coating was 200 micrometers. Here, as the base material, a sample of SUS 304 material, as shown in FIG. 9, was used.

The acid resistance of the samples was tested using 68% nitric acid (HNO ₃ ), 98% sulfuric acid (H ₂ SO ₄ ), 35% hydrochloric acid (HCl) and 98% aqua regia. The acid resistance test contained 20 ml of each acid in the sample to check whether corrosion occurred after 30 minutes. And the result is shown in FIG.

As can be seen in Figure 11, the coating layer according to Example 2 of the present invention was confirmed that the excellent acid resistance.

Density Test of Coating Layer

The alloy powder according to Example 2 was thermally spray coated on the surface of the base material. At this time, as a thermal spraying method, a HOVF thermal spraying method was used, and a mixed gas mixed with oxygen and nitrogen in a 1: 1 weight ratio was sprayed at 1,500 ° C. at an injection speed of 60 m / sec to form a film on the surface. The thickness of the said coating was 200 micrometers. Here, as the base material, an aluminum base material having a thickness of 2T was used.

12 illustrates photographs of cross-sectional layers according to Example 1 and Example 2. FIG.

12) a) shows 8 wt% nickel, molybdenum 5 wt%, chromium 25 wt%, phosphorus 11-14 wt%, boron 2.5 wt%, silicon 2 wt%, carbon 2 wt%, all and the balance iron according to Example 1 B) is a cross-sectional layer of alloy powder, b) 15wt% nickel, 5wt% molybdenum, 25wt% chromium, 11-14wt% phosphorus, boron 2.5wt%, silicon 2wt%, carbon 2wt%, cobalt (Co) according to Example 2 Illustrative cross-sectional layer of alloy powder comprising 5 wt%, and the balance of iron.

Compared to Example 1, it can be seen that the pores are reduced in Example 2 to have a dense lamination structure. Due to the dense lamination structure as in Example 2, it has good physical properties and is well adhered to the base material, which is well disconnected from the outside, and thus may be suitable for corrosion resistance.

As mentioned above, although this invention was demonstrated in detail using the preferable embodiment, the scope of the present invention is not limited to a specific embodiment, Comprising: It should be interpreted by the attached Claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

Claims (3)

As an amorphous alloy powder,
The alloy powder,
Nickel 8wt%, molybdenum 5wt%, chromium 25wt%, phosphorus 11-14 wt%, boron 2.5wt%, carbon 2wt%, silicon 2wt% and all the balance iron
The 8wt% nickel, 5wt% molybdenum and 25wt% chromium improves the corrosion resistance of the alloy powder, the 25wt% chromium increases the acid resistance of the alloy powder,
The particle average diameter of the alloy powder is 20 ~ 80㎛, the aspect ratio of the particles is 1 ~ 1.2,
The alloy powder is applied as a raw material powder for any one of the process of coating by mixing with high-speed flame spraying (High-Velocity Oxygen Fuel Spraying, HVOF), electric arc spraying, plasma spraying and solvent, Alloy powder having excellent corrosion resistance, characterized in that applied to the material of powder metallurgy.
As an amorphous alloy powder,
The alloy powder,
15 wt% nickel, 5 wt% molybdenum, 25 wt% chromium, 11-14 wt% phosphorus, 2.5 wt% boron, 2 wt% carbon, 2 wt% silicon, 5 wt% cobalt, and the balance iron
The nickel 15wt%, molybdenum 5wt% and chromium 25wt% improves the corrosion resistance of the alloy powder, the chromium 25wt% increases the acid resistance of the alloy powder,
The particle average diameter of the alloy powder is 20 ~ 80㎛, the aspect ratio of the particles is 1 ~ 1.2,
The alloy powder is applied as a raw material powder for any one of the process of coating by mixing with a high speed flame spray, electric arc spray, plasma spray and solvent, excellent corrosion resistance characterized in that applied to the material of powder metallurgy Alloy powder having a.
Injecting iron, nickel, molybdenum, chromium, phosphorus, boron, carbon, silicon and cobalt into the melting furnace to melt them into molten steel,
Tapping the molten steel with a tundish with an orifice created at the bottom;
Including the step of impinging the high-speed gas while flowing out the molten steel in the tundish to produce an alloy powder,
The prepared alloy powder has an average particle diameter of 20 to 80 μm in an amorphous state, an aspect ratio of the particle is 1 to 1.2,
The weight ratio of the introduced iron, nickel, molybdenum, chromium, phosphorus, boron, carbon, silicon and cobalt,
Of alloy powder having excellent corrosion resistance, characterized in that 15wt% nickel, 5wt% molybdenum, 25wt% chromium, 11-14wt% phosphorus, boron 2.5wt%, carbon 2wt%, silicon 2wt%, cobalt 5wt% and the balance iron. Manufacturing method.

Images