Method for improving atmospheric corrosion resistance of metal cerium through plasma treatment

Abstract

The invention relates to a method for improving atmospheric corrosion resistance of metal cerium through plasma treatment, and belongs to the technical field of plasma treatment corrosion resistance. The method comprises the following steps: putting a polished and ground metal cerium sheet into a discharge area of a flat plate type quartz sealed reactor, and sealing; the metal high-voltage electrode is connected with a low-temperature plasma power supply, the metal low-voltage electrode is grounded, and a gas inlet of the flat-plate quartz sealed reactor is communicated with a gas cylinder through a gas inlet pipe; working gas flow of the gas inlet pipe is adjusted through the mass flow meter, the low-temperature plasma power supply powers on the metal high-voltage electrode, working gas in the discharge area discharges to generate plasma, and the plasma acts on the surface of the metal cerium sheet to form a protection layer. Plasma is utilized to act on the surface of the metal cerium sheet, so that the corrosion-resistant layer is formed, and the atmospheric corrosion resistance can be effectively improved; and the atmosphere corrosion resistance of the metal cerium sheet is regulated and controlled by changing the working gas components in the gas cylinder, the plasma discharge power and the plasma treatment time.

Description

Technical Field

[0001] The invention relates to a method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment, belonging to the technical field of plasma treatment corrosion resistance. Background Art

[0002] Metal cerium easily reacts with oxygen, water and carbon dioxide in the atmosphere, causing severe corrosion, which seriously affects its engineering application. Therefore, the corrosion problem of cerium has always been an important research field. In order to improve the corrosion resistance of materials, various surface treatment technologies have emerged.

[0003] At present, it has been reported that the corrosion resistance treatment of metal cerium is mainly to introduce other metal elements (such as germanium) to construct a surface nano-germanium enriched layer to improve its corrosion resistance. However, this method will inevitably introduce other metal component impurities on the surface of metal cerium and change its physical and chemical properties, thereby reducing its functional application potential. Summary of the invention

[0004] In view of the problem that other metal impurities need to be introduced when improving the atmospheric corrosion resistance of metal cerium in the prior art, the present invention proposes a method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment. The present invention utilizes plasma to act on the surface of a metal cerium sheet to form a corrosion-resistant layer, which can effectively improve the atmospheric corrosion resistance; the corrosion resistance of the metal cerium sheet is regulated by changing the working gas composition in the gas cylinder, the plasma discharge power and the plasma treatment time.

[0005] A method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment, using an atmospheric pressure plasma discharge device, the atmospheric pressure plasma discharge device comprising a low-temperature plasma power supply, a flat-plate dielectric barrier discharge plasma device, and a gas cylinder, the flat-plate dielectric barrier discharge plasma device comprising a metal high-voltage electrode, a metal low-voltage electrode, and a flat-plate quartz sealed reactor, the quartz wall of the flat-plate quartz sealed reactor being a barrier medium, the metal high-voltage electrode and the metal low-voltage electrode being respectively attached to the outer sides of opposite surfaces of the flat-plate quartz sealed reactor, the metal high-voltage electrode being connected to the low-temperature plasma power supply, the metal low-voltage electrode being grounded, the flat-plate quartz sealed reactor being provided with a gas inlet and a gas outlet, the gas inlet being connected to the gas cylinder through an air inlet pipe, a mass flow meter being arranged on the air inlet pipe, and the gas outlet being connected to an exhaust pipe; the inner cavity of the flat-plate quartz sealed reactor covered between the metal high-voltage electrode and the metal low-voltage electrode being a discharge region, the metal cerium sheet being placed in the discharge region, and the gas cylinder being filled with a working gas;

[0006] The specific steps of the method are as follows:

[0007] (1) placing the polished cerium metal sheet into the discharge area of ​​a flat quartz sealed reactor and sealing it;

[0008] (2) connecting the metal high-voltage electrode to a low-temperature plasma power source, grounding the metal low-voltage electrode, and connecting the gas inlet of the flat quartz sealed reactor to a gas cylinder through an air inlet pipe;

[0009] (3) The working gas flow in the air inlet pipe is adjusted by a mass flow meter, and the low-temperature plasma power supply is energized to the metal high-voltage electrode. The working gas in the discharge area discharges to generate plasma, and the plasma acts on the surface of the metal cerium sheet to form a protective layer to improve the atmospheric corrosion resistance of the metal cerium; the composition of the protective layer on the surface of the metal cerium sheet is adjusted by changing the working gas composition in the gas cylinder; the thickness and quality of the protective layer on the surface of the metal cerium sheet are adjusted by changing the plasma discharge power and the plasma action time.

[0010] Preferably, the working gas is one or more of air, oxygen and nitrogen.

[0011] Preferably, the plasma discharge power is 20 to 60 W, and the plasma action time is 1 to 10 min.

[0012] The beneficial effects of the present invention are:

[0013] (1) The present invention can effectively improve the corrosion resistance of metal cerium sheets in the atmosphere through plasma surface treatment, and the cerium surface can obtain stability for more than 90 days, greatly improving the engineering application value of metal cerium;

[0014] (2) The present invention utilizes a flat-plate atmospheric pressure dielectric barrier discharge device, which has simple equipment and convenient process flow, and is suitable for treating the surface of a large area of ​​metal cerium sheet and obtaining corrosion resistance;

[0015] (3) The present invention utilizes atmospheric pressure plasma discharge to treat the surface of the metal cerium sheet, and a dense protective layer can be obtained in just a few minutes, which is suitable for rapid treatment of the metal cerium sheet;

[0016] (4) The present invention regulates the composition of the protective layer on the surface of the metal cerium sheet by changing the working gas composition in the gas cylinder; and regulates the thickness and quality of the protective layer on the surface of the metal cerium sheet by changing the plasma discharge power and the plasma action time, and its application range can be expanded according to needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of an atmospheric pressure plasma discharge device;

[0018] Figure 2 The surface photos of the cerium sheet samples of Example 1 and Comparative Example placed in the atmosphere for 3 months are compared;

[0019] Figure 3 The surface microscopic morphology and structural changes of the cerium sheet samples of Example 1 and the comparative example were compared after being placed in the atmosphere for 3 months;

[0020] Figure 4 Comparison of the components of the surface protective layer of the cerium sheet samples treated with plasma using different working gases in Example 2;

[0021] Figure 5 The surface photos of the cerium sheet samples of Example 2 and Comparative Example placed in the atmosphere for 3 months are compared;

[0022] Figure 6 The surface photos of the cerium sheet samples of Examples 3 to 5 and the comparative example are compared after being placed in the atmosphere for 50 days;

[0023] Figure 7 The weight gain comparison of the cerium sheet samples of Examples 3 to 5 and the comparative example after being placed in the atmosphere for 85 days;

[0024] Figure 8 Comparison of protective layer thickness of cerium sheet samples under different plasma treatment times in Examples 3 to 5;

[0025] Fig. 9 The surface photos of the cerium sheet samples of Examples 6 to 8 and the comparative example are compared after being placed in the atmosphere for 50 days;

[0026] Fig.10 The weight gain comparison of the cerium sheet samples of Examples 6 to 8 and the comparative example after being placed in the atmosphere for 85 days. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with specific implementation modes, but the protection scope of the present invention is not limited to the described contents.

[0028] Summary of the Invention

[0029] A method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment, adopting an atmospheric pressure plasma discharge device, the atmospheric pressure plasma discharge device comprising a low-temperature plasma power supply, a flat-plate dielectric barrier discharge plasma device, and a gas cylinder, the flat-plate dielectric barrier discharge plasma device comprising a metal high-voltage electrode, a metal low-voltage electrode, and a flat-plate quartz sealed reactor, the quartz wall of the flat-plate quartz sealed reactor being a barrier medium, the metal high-voltage electrode and the metal low-voltage electrode being respectively attached to the outer sides of opposite surfaces of the flat-plate quartz sealed reactor, the metal high-voltage electrode being connected to the low-temperature plasma power supply, the metal low-voltage electrode being grounded, the flat-plate quartz sealed reactor being provided with a gas inlet and a gas outlet, the gas inlet being connected to the gas cylinder through an air inlet pipe, a mass flow meter being arranged on the air inlet pipe, and the gas outlet being connected to an exhaust pipe; the inner cavity of the flat-plate quartz sealed reactor covered between the metal high-voltage electrode and the metal low-voltage electrode being a discharge region, the metal cerium sheet being placed in the discharge region, and the gas cylinder being filled with a working gas; the working gas being air, oxygen, or an air-oxygen mixture;

[0030] The specific steps of the method are as follows:

[0031] (1) placing the polished cerium metal sheet into the discharge area of ​​a flat quartz sealed reactor and sealing it;

[0032] (2) connecting the metal high-voltage electrode to a low-temperature plasma power source, grounding the metal low-voltage electrode, and connecting the gas inlet of the flat quartz sealed reactor to a gas cylinder through an air inlet pipe;

[0033] (3) The working gas flow in the air inlet pipe is adjusted by a mass flow meter, and the low-temperature plasma power supply is energized to the metal high-voltage electrode. The working gas discharges in the discharge area to generate plasma, and the plasma acts on the surface of the metal cerium sheet to form a protective layer to improve the atmospheric corrosion resistance of the metal cerium; the composition of the protective layer on the surface of the metal cerium sheet is regulated by changing the working gas composition in the gas cylinder; the thickness and quality of the protective layer on the surface of the metal cerium sheet are regulated by changing the plasma discharge power and the plasma action time; preferably, the plasma discharge power is 20 to 60 W, and the plasma action time is 1 to 10 min.

[0034] Example 1: A method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment, using an atmospheric pressure plasma discharge device, and the specific steps are as follows:

[0035] (1) placing the polished cerium metal sheet into the discharge area of ​​a flat quartz sealed reactor and sealing it;

[0036] (2) connecting the metal high-voltage electrode to a low-temperature plasma power source, grounding the metal low-voltage electrode, and connecting the gas inlet of the flat quartz sealed reactor to a gas cylinder (filled with air) through an air inlet pipe;

[0037] (3) The working gas (air) flow rate (50 mL / min) of the inlet pipe is adjusted by a mass flow meter, and the low-temperature plasma power supply is energized to the metal high-voltage electrode (400 s). The working gas (air) discharges in the discharge area to generate plasma (discharge power is 54 W). The plasma acts on the surface of the metal cerium sheet to form a protective layer to improve the atmospheric corrosion resistance of the metal cerium;

[0038] The metal cerium sheet that was only polished was used as the comparative sample. The metal cerium sheet sample treated with air plasma in this embodiment was placed in the air with the same temperature (20-25°C) and humidity (40-50%) for 3 months. During this period, the surfaces of the comparative sample and the cerium sample in this embodiment were photographed. The results are shown in FIG. Figure 2The surface of the metal cerium sheet of this embodiment can maintain a relatively flat structure within 3 months after plasma treatment, while the surface of the comparative sample (without plasma treatment) is severely corroded in the atmosphere; therefore, air plasma treatment of the metal cerium surface can significantly improve its atmospheric corrosion resistance;

[0039] The surfaces of the cerium sheet samples of this embodiment and the comparative example samples were photographed using a white light interferometer and a scanning electron microscope. Figure 3 ,from Figure 3 It can be seen that compared with the surface of the comparative example cerium sheet sample that has not been treated with plasma, the surface morphology and structure of the cerium sheet sample treated with air plasma in this embodiment are relatively stable, and the atmospheric corrosion resistance is excellent.

[0040] Example 2: A method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment, using an atmospheric pressure plasma discharge device, and the specific steps are as follows:

[0041] (1) placing the polished cerium metal sheet into the discharge area of ​​a flat quartz sealed reactor and sealing it;

[0042] (2) connecting the metal high-voltage electrode to a low-temperature plasma power source, grounding the metal low-voltage electrode, and connecting the gas inlet of the flat quartz sealed reactor to two gas cylinders (the two gas cylinders are filled with oxygen and air respectively) through an air inlet pipe;

[0043] (3) The working gas (pure oxygen, air, air-oxygen mixture) flow rate of the inlet pipe is adjusted by a mass flow meter (total flow rate is 50 mL / min), and the low-temperature plasma power supply is energized to the metal high-voltage electrode (400 s). The working gas in the discharge area discharges to generate plasma (discharge power is 54 W), and the plasma acts on the surface of the metal cerium sheet to form a protective layer to improve the anti-oxygen corrosion performance of the metal cerium; wherein the volume fraction of air in the air-oxygen mixture is 50%;

[0044] In this embodiment, the metal cerium sheet samples treated with three different gas plasmas (pure oxygen, air, and air-oxygen mixture) were tested for the composition of the surface protective layer using an X-ray diffractometer. The results are shown in Figure 4 The surface composition of the cerium sample treated with pure oxygen plasma is cerium dioxide, the surface composition of the cerium sample treated with air plasma is a mixture of cerium trioxide and cerium dioxide, and the surface of the cerium sample treated with air-oxygen mixed gas plasma has both, but the proportions are different; therefore, the protective layer formed on the surface of metal cerium treated with different gas composition plasma has different compositions;

[0045] The metal cerium sheet that was only polished was used as the comparative sample. The metal cerium sheet samples treated with three different gases (pure oxygen, air, and air-oxygen mixture) plasma in this embodiment were placed in the same atmosphere with the same temperature (20-25°C) and humidity (40-50%) for 3 months. The surfaces of the comparative sample and the cerium sample in this embodiment were photographed. The results are shown in FIG. Figure 5 The surface of the metal cerium sheet of this embodiment can maintain a relatively flat structure within 3 months after plasma treatment, while the surface of the comparative sample (without plasma treatment) is severely corroded in the atmosphere; therefore, although the composition of the surface protective layer of metal cerium treated with different gas plasmas is different, it can significantly improve its atmospheric corrosion resistance, so the application scope of plasma-treated metal cerium materials can be broadened according to demand.

[0046] Example 3: A method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment, using an atmospheric pressure plasma discharge device, and the specific steps are as follows:

[0047] (1) placing the polished cerium metal sheet into the discharge area of ​​a flat quartz sealed reactor and sealing it;

[0048] (2) connecting the metal high-voltage electrode to a low-temperature plasma power source, grounding the metal low-voltage electrode, and connecting the gas inlet of the flat quartz sealed reactor to a gas cylinder (filled with air) through an air inlet pipe;

[0049] (3) The working gas (air) flow rate (50 mL / min) of the inlet pipe is adjusted by a mass flow meter, and the low-temperature plasma power supply is energized to the metal high-voltage electrode (300 s). The working gas (air) discharges in the discharge area to generate plasma (discharge power is 54 W). The plasma acts on the surface of the metal cerium sheet to form a protective layer to improve the atmospheric corrosion resistance of the metal cerium;

[0050] The metal cerium sheet samples treated with air plasma in this embodiment were placed in an atmosphere with the same temperature (20-25°C) and humidity (40-50%) for 50 days. During this period, the surfaces of the comparative sample and the cerium sample in this embodiment were photographed. The results are shown in FIG. Figure 6 The surface of the metal cerium sheet of this embodiment can maintain a relatively flat structure within 50 days after plasma treatment, while the surface of the comparative sample (without plasma treatment) is severely corroded in the atmosphere; therefore, treating the metal cerium surface with air plasma for 300 seconds can significantly improve its atmospheric corrosion resistance.

[0051] Example 4: A method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment, using an atmospheric pressure plasma discharge device, and the specific steps are as follows:

[0052] (1) placing the polished cerium metal sheet into the discharge area of ​​a flat quartz sealed reactor and sealing it;

[0053] (2) connecting the metal high-voltage electrode to a low-temperature plasma power source, grounding the metal low-voltage electrode, and connecting the gas inlet of the flat quartz sealed reactor to a gas cylinder (filled with air) through an air inlet pipe;

[0054] (3) The working gas (air) flow rate (50 mL / min) of the inlet pipe is adjusted by a mass flow meter, and the low-temperature plasma power supply is energized to the metal high-voltage electrode (200 s). The working gas (air) discharges in the discharge area to generate plasma (discharge power is 54 W). The plasma acts on the surface of the metal cerium sheet to form a protective layer to improve the atmospheric corrosion resistance of the metal cerium;

[0055] The metal cerium sheet samples treated with air plasma in this embodiment were placed in an atmosphere with the same temperature (20-25°C) and humidity (40-50%) for 50 days. During this period, the surfaces of the comparative sample and the cerium sample in this embodiment were photographed. The results are shown in FIG. Figure 6 The surface of the metal cerium sheet of this embodiment can maintain a relatively flat structure within 50 days after plasma treatment, while the surface of the comparative sample (without plasma treatment) is severely corroded in the atmosphere; therefore, air plasma treatment of the metal cerium surface for 200 seconds can significantly improve its atmospheric corrosion resistance.

[0056] Example 5: A method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment, using an atmospheric pressure plasma discharge device, and the specific steps are as follows:

[0057] (1) placing the polished cerium metal sheet into the discharge area of ​​a flat quartz sealed reactor and sealing it;

[0058] (2) connecting the metal high-voltage electrode to a low-temperature plasma power source, grounding the metal low-voltage electrode, and connecting the gas inlet of the flat quartz sealed reactor to a gas cylinder (filled with air) through an air inlet pipe;

[0059] (3) The working gas (air) flow rate (80 mL / min) of the inlet pipe is adjusted by a mass flow meter, and the low-temperature plasma power supply is energized to the metal high-voltage electrode (100 s). The working gas (air) discharges in the discharge area to generate plasma (discharge power is 54 W). The plasma acts on the surface of the metal cerium sheet to form a protective layer to improve the atmospheric corrosion resistance of the metal cerium;

[0060] The metal cerium sheet samples treated with air plasma in this embodiment were placed in an atmosphere with the same temperature (20-25°C) and humidity (40-50%) for 50 days. During this period, the surfaces of the comparative sample and the cerium sample in this embodiment were photographed. The results are shown in FIG. Figure 6 The surface of the metal cerium sheet of this embodiment can maintain a relatively flat structure within 50 days after plasma treatment, while the surface of the comparative sample (without plasma treatment) is severely corroded in the atmosphere; therefore, treating the metal cerium surface with air plasma for 100 seconds can significantly improve its atmospheric corrosion resistance;

[0061] The comparison of the weight gain of the metal cerium sheet samples treated with air plasma in Examples 3 to 5 and the comparative cerium sheet samples placed in the atmosphere for 85 days is shown in FIG. Figure 7 The comparison of the protective layer thickness of the cerium sheet samples under different plasma treatment times in Examples 3 to 5 is shown in Figure 8 ,from Figure 8 It can be seen that the protective layer thickness of the cerium sheet samples under different plasma treatment times in Examples 3 to 5 is different, but Figure 7 It can be seen that the mass gain of the cerium sheet samples with different plasma treatment times after being placed in the atmosphere for 85 days is very small, especially the mass of the cerium sheet samples treated with plasma in Example 3 and Example 4 is almost unchanged; while the mass gain of the comparative cerium sheet samples after being placed in the atmosphere for 85 days is obvious, indicating that the oxidative corrosion is serious. Therefore, the surfaces of the cerium sheets with different plasma treatment times have good resistance to atmospheric corrosion.

[0062] Example 6: A method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment, using an atmospheric pressure plasma discharge device, and the specific steps are as follows:

[0063] (1) placing the polished cerium metal sheet into the discharge area of ​​a flat quartz sealed reactor and sealing it;

[0064] (2) connecting the metal high-voltage electrode to a low-temperature plasma power source, grounding the metal low-voltage electrode, and connecting the gas inlet of the flat quartz sealed reactor to a gas cylinder (filled with air) through an air inlet pipe;

[0065] (3) The working gas (air) flow rate (80 mL / min) of the inlet pipe is adjusted by a mass flow meter, and the low-temperature plasma power supply is energized to the metal high-voltage electrode (300 s). The working gas (air) discharges in the discharge area to generate plasma (discharge power is 54 W). The plasma acts on the surface of the metal cerium sheet to form a protective layer to improve the atmospheric corrosion resistance of the metal cerium;

[0066] The metal cerium sheet samples treated with air plasma in this embodiment were placed in an atmosphere with the same temperature (20-25°C) and humidity (40-50%) for 50 days. During this period, the surfaces of the comparative sample and the cerium sample in this embodiment were photographed. The results are shown in FIG. Fig. 9The surface of the metal cerium sheet of this embodiment can maintain a relatively flat structure within 50 days after plasma treatment, while the surface of the comparative sample (without plasma treatment) is severely corroded in the atmosphere; therefore, treating the metal cerium surface with air plasma for 300 seconds can significantly improve its atmospheric corrosion resistance.

[0067] Example 7: A method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment, using an atmospheric pressure plasma discharge device, and the specific steps are as follows:

[0068] (1) placing the polished cerium metal sheet into the discharge area of ​​a flat quartz sealed reactor and sealing it;

[0069] (2) connecting the metal high-voltage electrode to a low-temperature plasma power source, grounding the metal low-voltage electrode, and connecting the gas inlet of the flat quartz sealed reactor to a gas cylinder (filled with air) through an air inlet pipe;

[0070] (3) The working gas (air) flow rate (80 mL / min) of the inlet pipe is adjusted by a mass flow meter, and the low-temperature plasma power supply is energized to the metal high-voltage electrode (300 s). The working gas (air) discharges in the discharge area to generate plasma (discharge power is 36 W). The plasma acts on the surface of the metal cerium sheet to form a protective layer to improve the atmospheric corrosion resistance of the metal cerium;

[0071] The metal cerium sheet samples treated with air plasma in this embodiment were placed in an atmosphere with the same temperature (20-25°C) and humidity (40-50%) for 50 days. During this period, the surfaces of the comparative sample and the cerium sample in this embodiment were photographed. The results are shown in FIG. Fig. 9 The surface of the metal cerium sheet of this embodiment can maintain a relatively flat structure within 50 days after plasma treatment, while the surface of the comparative sample (without plasma treatment) is severely corroded in the atmosphere; therefore, treating the metal cerium surface with air plasma for 300 seconds can significantly improve its atmospheric corrosion resistance.

[0072] Example 8: A method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment, using an atmospheric pressure plasma discharge device, and the specific steps are as follows:

[0073] (1) placing the polished cerium metal sheet into the discharge area of ​​a flat quartz sealed reactor and sealing it;

[0074] (2) connecting the metal high-voltage electrode to a low-temperature plasma power source, grounding the metal low-voltage electrode, and connecting the gas inlet of the flat quartz sealed reactor to a gas cylinder (filled with air) through an air inlet pipe;

[0075] (3) The working gas (air) flow rate (80 mL / min) of the inlet pipe is adjusted by a mass flow meter, and the low-temperature plasma power supply is energized to the metal high-voltage electrode (300 s). The working gas (air) discharges in the discharge area to generate plasma (discharge power is 20 W), and the plasma acts on the surface of the metal cerium sheet to form a protective layer to improve the atmospheric corrosion resistance of the metal cerium;

[0076] The metal cerium sheet samples treated with air plasma in this embodiment were placed in an atmosphere with the same temperature (20-25°C) and humidity (40-50%) for 50 days. During this period, the surfaces of the comparative sample and the cerium sample in this embodiment were photographed. The results are shown in FIG. Fig. 9 The surface of the metal cerium sheet of this embodiment can maintain a relatively flat structure within 50 days after plasma treatment, while the surface of the comparative sample (without plasma treatment) is severely corroded in the atmosphere; therefore, treating the metal cerium surface with air plasma for 300 seconds can significantly improve its atmospheric corrosion resistance;

[0077] The weight gain of the cerium sheet samples of Examples 6 to 8 and the comparative example after being placed in the atmosphere for 85 days is shown in FIG. Fig.10 ,from Fig.10 It can be seen that the mass gain of the cerium sheet samples treated with plasma at different discharge powers after being placed in the atmosphere for 85 days is very small, especially the mass of the cerium sheet samples in Example 6 when the plasma discharge power is 54 W has almost no change; while the mass gain of the comparative cerium sheet samples after being placed in the atmosphere for 85 days is obvious, indicating serious oxidative corrosion. Therefore, the surfaces of the cerium sheets treated with plasma at different discharge powers have good resistance to atmospheric corrosion.

[0078] The specific implementation modes of the present invention are described in detail above, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A method for improving the atmospheric corrosion resistance of metallic cerium by plasma treatment, characterized in that: An atmospheric pressure plasma discharge device is used, the atmospheric pressure plasma discharge device comprises a low-temperature plasma power supply, a flat dielectric barrier discharge plasma device, and a gas cylinder. The flat dielectric barrier discharge plasma device comprises a metal high-voltage electrode, a metal low-voltage electrode, and a flat quartz sealed reactor. The quartz wall of the flat quartz sealed reactor is a barrier medium. The metal high-voltage electrode and the metal low-voltage electrode are respectively attached to the outer sides of opposite surfaces of the flat quartz sealed reactor. The metal high-voltage electrode is connected to the low-temperature plasma power supply, and the metal low-voltage electrode is grounded. The flat quartz sealed reactor is provided with a gas inlet and a gas outlet. The gas inlet is connected to the gas cylinder through an air inlet pipe, a mass flow meter is provided on the air inlet pipe, and the gas outlet is connected to an exhaust pipe. The inner cavity of the flat quartz sealed reactor covered between the metal high-voltage electrode and the metal low-voltage electrode is a discharge area. The metal cerium sheet is placed in the discharge area. The gas cylinder is filled with working gas. The specific steps of the method are as follows: (1) placing the polished cerium metal sheet into the discharge area of ​​a flat quartz sealed reactor and sealing it; (2) connecting the metal high-voltage electrode to a low-temperature plasma power source, grounding the metal low-voltage electrode, and connecting the gas inlet of the flat quartz sealed reactor to a gas cylinder through an air inlet pipe; (3) The working gas flow in the air inlet pipe is adjusted by a mass flow meter, and the low-temperature plasma power supply is energized to the metal high-voltage electrode. The working gas in the discharge area discharges to generate plasma, and the plasma acts on the surface of the metal cerium sheet to form a protective layer to improve the atmospheric corrosion resistance of the metal cerium; the composition of the protective layer on the surface of the metal cerium sheet is adjusted by changing the working gas composition in the gas cylinder; the thickness and quality of the protective layer on the surface of the metal cerium sheet are adjusted by changing the plasma discharge power and the plasma action time.

2. The method for improving the atmospheric corrosion resistance of metallic cerium by plasma treatment according to claim 1, characterized in that: The working gas is air, oxygen or an air-oxygen mixture.

3. The method for improving the atmospheric corrosion resistance of metal cerium by plasma treatment according to claim 1, characterized in that: The plasma discharge power is 20-60W, and the plasma action time is 1-10min.

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