Low-temperature preparation method of corrosion-resistant coating on surface of manganese-copper damping alloy

Abstract

The invention provides a low-temperature preparation method for a corrosion-resistant coating on the surface of a manganese-copper damping alloy, which comprises the following steps: S1, pretreating a manganese-copper damping alloy workpiece to remove oil stains and oxides on the surface; s2, the pretreated workpiece is placed in a solution containing specific chemical substances and soaked for 10-60 minutes at the temperature of 20-80 DEG C, and a layer of chemical conversion film is formed; (S3); cleaning and drying the formed chemical conversion film; s4, depositing an alloy coating with the thickness of 0.5-5 microns on the chemical conversion film at the temperature of 50-200 DEG C through a physical vapor deposition technology; and S5, annealing treatment is conducted on the deposited coating. The coating is prepared at low temperature, so that the prepared coating has better corrosion resistance.

Description

Technical Field

[0001] The invention relates to a metal surface treatment technology, and in particular to a low-temperature preparation method for a corrosion-resistant coating on the surface of a manganese-copper damping alloy. Background Art

[0002] Manganese copper damping alloy has been widely used in precision instruments, aerospace, automobile manufacturing and other fields due to its excellent shock absorption performance and stable mechanical properties. However, manganese copper damping alloy is easily corroded in certain corrosive environments, resulting in its performance degradation or even failure. Therefore, improving its surface corrosion resistance is one of the important means to extend its service life and ensure its function.

[0003] At present, the commonly used surface corrosion resistance treatment methods include chemical conversion film treatment, electroplating, thermal spraying, physical vapor deposition (PVD), etc. These methods have their own advantages and disadvantages: Chemical conversion film treatment: a protective film is formed on the metal surface through chemical reaction, which is simple to operate and low in cost, but the film thickness is limited and the corrosion resistance is general. The metal ions in the electrolyte are reduced and deposited on the cathode to form a coating, and a uniform and dense coating can be obtained, but a higher temperature is required during the electroplating process, which may affect the performance of the base material. The metal or alloy powder is melted at high temperature and sprayed onto the surface of the substrate to form a coating, which is suitable for large-area and complex-shaped workpieces, but the temperature during thermal spraying is high, which may cause deformation or performance changes of the base material.

[0004] Although the above methods have improved the surface corrosion resistance of manganese-copper damping alloy to a certain extent, there are still some shortcomings, that is, many traditional methods need to be carried out at higher temperatures, which may cause thermal deformation or performance changes of the base material, especially for precision parts. This is particularly important. Although some advanced surface treatment technologies have good effects, they require large equipment investment and high operating costs, which limits their application in large-scale production. Traditional methods are difficult to form a uniform coating on the surface of workpieces with complex shapes, which affects the protective effect of the coating.

[0005] Therefore, it is necessary to design a coating with better corrosion resistance to improve the damping performance of manganese-copper damping alloy. Summary of the invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a low-temperature preparation method for a corrosion-resistant coating on the surface of a manganese-copper damping alloy.

[0007] In order to achieve the above object, the present invention provides a low-temperature preparation method for a corrosion-resistant coating on the surface of a manganese-copper damping alloy, comprising the following steps:

[0008] S1: pre-treat the manganese-copper damping alloy workpiece to remove surface oil and oxides;

[0009] S2: placing the pretreated workpiece in a solution containing specific chemical substances, soaking it at a temperature of 20-80°C for 10-60 minutes to form a chemical conversion film;

[0010] S3; cleaning and drying the formed chemical conversion film;

[0011] S4: depositing a layer of alloy coating with a thickness of 0.5 to 5 microns on the chemical conversion film by physical vapor deposition technology at a temperature of 50 to 200° C.;

[0012] S5: Annealing the deposited coating.

[0013] Preferably, the solution containing specific chemical substances includes one or more of phosphate, chromate, silicate, and plating solution.

[0014] Preferably, the solution containing the specific chemical substance is a mixed composition of the following mass percentages: Cu: 40-75%, Ni: 1-2%, Al: 1-1.5%, La: 0-0.5%, and the rest is Mn.

[0015] Preferably, the plating solution includes nickel sulfate, nickel chloride, ammonium sulfate, boric acid, sodium acetate and sodium chloride.

[0016] Preferably, the physical vapor deposition technique is one or more of magnetron sputtering, electron beam evaporation or ion plating.

[0017] Preferably, the pretreatment step comprises:

[0018] Use organic solvent to clean the workpiece surface and remove oil stains;

[0019] Use alkaline solution to clean the workpiece surface to remove mild oxides;

[0020] Use acidic solution to clean the workpiece surface to remove oxide scale and rust;

[0021] Use ultrasonic cleaning to clean the workpiece surface and remove dirt in tiny gaps;

[0022] Use compressed air to dry the workpiece surface.

[0023] Preferably, the annealing temperature is 100-300° C., and the time is 0.5-2 hours.

[0024] Preferably, the alloy material of the coating is one or more of nickel, zinc, cobalt and chromium.

[0025] Preferably, the manganese-copper damping alloy workpiece is any one of oxygen-free copper, copper alloy, titanium alloy, magnesium-aluminum alloy, steel, oxide ceramics, and nitride ceramics.

[0026] The present invention provides a low-temperature preparation method for a corrosion-resistant coating on the surface of a manganese-copper damping alloy, which has the following beneficial effects:

[0027] 1. The entire preparation process of the coating on the surface of the manganese-copper damping alloy workpiece manufactured by the present invention is carried out at a relatively low temperature, thereby avoiding thermal deformation and performance changes of the workpiece material.

[0028] 2. Through low-temperature PVD technology, the coating formed on the surface of workpieces with complex shapes can be more uniform, dense and practical.

[0029] 3. The prepared coating has excellent corrosion resistance and mechanical properties, and can effectively extend the service life of the manganese-copper damping alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a flow chart of a low-temperature preparation method of a corrosion-resistant coating on the surface of a manganese-copper damping alloy. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0032] like Figure 1 As shown, the present invention provides a low-temperature preparation method for a corrosion-resistant coating on the surface of a manganese-copper damping alloy, the steps of which include:

[0033] S1: pre-treat the manganese-copper damping alloy workpiece to remove surface oil and oxides;

[0034] Specifically, the manganese copper damping alloy workpiece is any one of oxygen-free copper, copper alloy, titanium alloy, magnesium aluminum alloy, steel, oxide ceramics, and nitride ceramics. The pretreatment steps include:

[0035] S1.1: Use organic solvent to clean the workpiece surface and remove oil stains;

[0036] The manganese-copper damping alloy workpiece was immersed in acetone and ultrasonically cleaned for 10 minutes to remove the surface oil. The workpiece was then taken out, rinsed with deionized water, and dried naturally.

[0037] S1.2: Use alkaline solution to clean the workpiece surface to remove mild oxides;

[0038] Soak the dried workpiece in 5% sodium hydroxide solution at room temperature for 10 minutes to remove mild oxides. Take out the workpiece and rinse it with deionized water.

[0039] S1.3: Use acid solution to clean the workpiece surface to remove oxide scale and rust;

[0040] Soak the workpiece in 10% sulfuric acid solution at room temperature for 5 minutes to remove scale and rust, then take out the workpiece.

[0041] S1.4: Use ultrasonic cleaning to clean the workpiece surface and remove dirt in tiny gaps;

[0042] S1.5: Use compressed air to dry the workpiece surface.

[0043] S2: placing the pretreated workpiece in a solution containing specific chemical substances, soaking it at a temperature of 20-80°C for 10-60 minutes to form a chemical conversion film;

[0044] In this embodiment, the solution containing specific chemical substances includes one or more of phosphate, chromate, silicate, and plating solution, and the plating solution includes nickel sulfate, nickel chloride, ammonium sulfate, boric acid, sodium acetate, and sodium chloride. In another embodiment, the solution containing specific chemical substances is a mixed composition of the following mass percentages: Cu: 40-75%, Ni: 1-2%, Al: 1-1.5%, La: 0-0.5%, and the rest is Mn. In this embodiment, the solution containing specific chemical substances takes phosphate and chromate as examples. The pretreated workpiece is immersed in a mixed solution containing 4% phosphate and 2% chromate at a temperature of 60°C for 30 minutes, then the workpiece is taken out, rinsed with deionized water, and dried naturally. The chemical conversion film formed can improve the activity and roughness of the workpiece surface and enhance the adhesion of subsequent coatings.

[0045] S3; cleaning and drying the formed chemical conversion film;

[0046] Specifically, the chemical conversion film is immersed in a chemical solution at a temperature of 60° C. for 30 minutes, after which the workpiece is taken out, rinsed with deionized water, and the surface of the workpiece is dried with compressed air or allowed to dry naturally.

[0047] S4: depositing a layer of alloy coating with a thickness of 0.5 to 5 microns on the chemical conversion film by physical vapor deposition technology at a temperature of 50 to 200° C.;

[0048] Specifically, the workpiece is fixed on the workpiece holder of the magnetron sputtering equipment, the deposition temperature is set to 150°C, the deposition time is 1 hour, and the target material is pure nickel. The equipment is turned on, PVD deposition is performed, and a nickel coating with a thickness of about 2 microns is formed. Among them, the physical vapor deposition technology is one or more of magnetron sputtering, electron beam evaporation or ion plating. In this embodiment, taking magnetron sputtering as an example, during deposition, the power supply is started, voltage and current are applied, so that the atoms or molecules on the surface of the target material are sputtered out, and the sputtered atoms or molecules are deposited on the surface of the substrate to form a coating. Among them, the alloy material of the coating is one or more of nickel, zinc, cobalt, and chromium. In this embodiment, nickel coating alloy is preferably used. The thickness of the nickel coating alloy is 3 to 5 microns. Among them, the workpiece holder of the controlled sputtering equipment used includes but is not limited to fixed, rotating, multi-layer grid-type workpieces, and optionally, the present embodiment preferably uses a fixed workpiece holder. The present invention ensures the uniformity and density of the coating by depositing a metal or alloy coating by PVD technology at a lower temperature.

[0049] S5: performing annealing treatment on the deposited coating at a temperature of 100-300° C. for 0.5-2 hours.

[0050] Specifically, the workpiece with the nickel coating deposited thereon is placed in an annealing furnace, the annealing temperature is set to 200° C., and the annealing time is 1 hour. After the annealing is completed, it is naturally cooled to room temperature. The present invention further enhances the bonding force between the coating and the workpiece through low-temperature annealing, thereby improving the overall performance of the coating.

[0051] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

Claims

1. A low-temperature preparation method for a corrosion-resistant coating on the surface of a manganese-copper damping alloy, characterized in that: The following steps are involved: S1: pre-treat the manganese-copper damping alloy workpiece to remove surface oil and oxides; S2: placing the pretreated workpiece in a solution containing specific chemical substances, soaking it at a temperature of 20-80°C for 10-60 minutes to form a chemical conversion film; S3; cleaning and drying the formed chemical conversion film; S4: depositing a layer of alloy coating with a thickness of 0.5 to 5 microns on the chemical conversion film by physical vapor deposition technology at a temperature of 50 to 200° C.; S5: Annealing the deposited coating.

2. The low-temperature preparation method for the corrosion-resistant coating on the surface of manganese-copper damping alloy according to claim 1, characterized in that: The solution containing specific chemical substances includes one or more of phosphate, chromate, silicate and plating solution.

3. The low-temperature preparation method for the corrosion-resistant coating on the surface of manganese-copper damping alloy according to claim 1, characterized in that: The solution containing the specific chemical substance is a mixture of the following mass percentages: Composition: Cu: 40-75%, Ni: 1-2%, Al: 1-1.5%, La: 0-0.5%, and the rest is Mn.

4. The low-temperature preparation method for the corrosion-resistant coating on the surface of manganese-copper damping alloy according to claim 1, characterized in that: The plating solution comprises nickel sulfate, nickel chloride, ammonium sulfate, boric acid, sodium acetate and sodium chloride.

5. The low-temperature preparation method for the corrosion-resistant coating on the surface of manganese-copper damping alloy according to claim 1, characterized in that: The physical vapor deposition technology is one or more of magnetron sputtering, electron beam evaporation or ion plating.

6. The low-temperature preparation method for the corrosion-resistant coating on the surface of manganese-copper damping alloy according to claim 1, characterized in that: The pre-processing step comprises: Use organic solvent to clean the workpiece surface and remove oil stains; Use alkaline solution to clean the workpiece surface to remove mild oxides; Use acidic solution to clean the workpiece surface to remove oxide scale and rust; Use ultrasonic cleaning to clean the workpiece surface and remove dirt in tiny gaps; Use compressed air to dry the workpiece surface.

7. The low-temperature preparation method for the corrosion-resistant coating on the surface of manganese-copper damping alloy according to claim 1, characterized in that: The annealing temperature is 100-300° C., and the annealing time is 0.5-2 hours.

8. The low-temperature preparation method for the corrosion-resistant coating on the surface of manganese-copper damping alloy according to claim 1, characterized in that: The alloy material of the coating is one or more of nickel, zinc, cobalt and chromium.

9. The low-temperature preparation method for the corrosion-resistant coating on the surface of manganese-copper damping alloy according to claim 8, characterized in that: The manganese-copper damping alloy workpiece is any one of oxygen-free copper, copper alloy, titanium alloy, magnesium-aluminum alloy, steel, oxide ceramics, and nitride ceramics.

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