Wear-resistant corrosion-resistant roller based on electro-galvanized sheet production and preparation method thereof

Abstract

This invention discloses a wear-resistant and corrosion-resistant roller produced from electrostatically galvanized sheet metal and its preparation method. The roller includes a roller body, the surface of which is coated with a wear-resistant and corrosion-resistant layer. The wear-resistant and corrosion-resistant coating consists of, from the inside out, a conductive bonding layer, a corrosion-resistant transition layer, and a wear-resistant functional layer. The conductive bonding layer is a Ni-Cr-Al-Y alloy with a resistivity ≤1.2×10⁻⁶. ‑6 The corrosion-resistant transition layer is an Al-Fe-Cr-Mo amorphous alloy with a zinc melt corrosion rate ≤0.01mm / year; the wear-resistant functional layer is a WC-reinforced Ni-based composite coating with a microhardness ≥1200HV and an WC particle orientation angle ≤15° with the normal. This invention, through gradient functional design, amorphous alloy application, and multi-process synergistic control, achieves a roller lifespan of over 12 months, a 300% improvement over traditional technologies.

Description

Technical Field

[0001] This invention relates to the technical field of electrostatic galvanized sheet production equipment, specifically to a wear-resistant and corrosion-resistant roller produced from electrostatic galvanized sheet and its preparation method. Background Technology

[0002] In the production of electrostatic galvanized sheet, zinc powder is uniformly adsorbed onto the surface of the sheet through the action of an electric field. The roller, as the core transmission component, must simultaneously meet the following requirements: Conductivity: The surface resistance of the roller needs to be stable at 10. -6 The electrostatic field is on the order of Ω·m to ensure a uniform distribution of the electrostatic field. Heat resistance: For long-term contact with molten zinc at 450-500℃, the coating's coefficient of thermal expansion must be similar to that of the substrate (45# steel, 12×10⁻⁶). -6 ( / ℃) matching; Thermal shock resistance: When the production line starts or stops, the surface temperature of the rollers changes drastically (ΔT≥300℃), and the coating needs to resist cracking caused by thermal stress. Abrasion resistance: When the conveying speed of the sheet reaches 60m / min, the roller surface must withstand continuous friction with a dynamic friction coefficient ≤0.3; Corrosion resistance: When the Cl⁻ concentration in the zinc bath reaches 50ppm, the corrosion rate of the coating must be ≤0.05mm / year.

[0003] 2. Limitations of existing technology (1) Defects of a single coating system Metal coatings (such as electroplated chromium): High hardness (HV800-1000), but at high temperatures they are prone to displacement reaction with zinc liquid (Cr + Zn²⁺→Cr³⁺+ Zn), which leads to coating dissolution; the electroplating process produces hydrogen embrittlement, which reduces the adhesion between the coating and the substrate (bonding strength ≤30MPa).

[0004] Ceramic coatings (such as Al2O3 and Cr2O3) have excellent resistance to zinc liquid corrosion (corrosion rate ≤ 0.01 mm / year), but are brittle (fracture toughness ≤ 3 MPa·m¹ / ²) and are prone to cracking under impact loads; their insulation properties cause a 20-30% decrease in electrostatic adsorption efficiency, requiring the addition of an additional conductive layer.

[0005] (2) Technical contradictions of composite coatings Functional layer stacking design: Existing technologies (such as CN105256302A) employ a "Cr coating + Al2O3 ceramic layer" structure, which improves corrosion resistance, but results in a mismatch in the interlayer thermal expansion coefficients (Cr: 6.8×10). -6 / ℃, Al2O3: 8.5×10 -6 / ℃) causes interfacial stress concentration, leading to coating peeling during thermal cycling; Inadequacies of gradient coating design: CN110387845A proposes a gradient coating of "Ni-based alloy + WC particles", but the WC particles are randomly distributed and do not achieve directional arrangement, resulting in limited improvement in resistance to micro-machining (wear is reduced by only 15%).

[0006] (3) Compatibility issues of the preparation process Conflict between electroplating and thermal spraying processes: Electroplating of chromium needs to be carried out below 50°C, while thermal spraying of WC coating requires the substrate to be preheated to above 200°C, which causes the electroplated layer to oxidize and fail during the preheating process. Poor compatibility between laser cladding and substrate: When using traditional laser cladding of Al-based alloys, the high-energy beam causes the heat-affected zone (HAZ) of the substrate to reach a depth of 2mm, resulting in a decrease in substrate hardness (HRC25→HRC20) and shortening the overall lifespan of the roller.

[0007] 3. Technical necessity of the present invention Current technologies cannot simultaneously solve the following problems: First, the chemical stability of the coating in high-temperature zinc liquid; second, the fatigue resistance under dynamic load; and third, the process compatibility of multi-process collaborative preparation. Summary of the Invention

[0008] The purpose of this invention is to provide a wear-resistant and corrosion-resistant roller based on electrostatic galvanized sheet material with a long service life.

[0009] Another object of the present invention is to provide a method for preparing wear-resistant and corrosion-resistant rollers based on electrostatic galvanized sheet.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The wear-resistant and corrosion-resistant roller, manufactured from electrostatically galvanized sheet metal, includes a roller body. The surface of the roller body is coated with an wear-resistant and corrosion-resistant layer. This coating, from the inside out, consists of a conductive bonding layer, a corrosion-resistant transition layer, and an wear-resistant functional layer. The conductive bonding layer is a Ni-Cr-Al-Y alloy with a resistivity ≤1.2×10⁻⁶. -6 The corrosion-resistant transition layer is an Al-Fe-Cr-Mo amorphous alloy with a zinc liquid corrosion rate ≤0.01mm / year; the wear-resistant functional layer is a WC-reinforced Ni-based composite coating with a microhardness ≥1200HV and an WC particle orientation angle ≤15° with the normal.

[0011] Furthermore, the composition of the Al-Fe-Cr-Mo amorphous alloy is Al: 58-72wt%, Fe: 15-25wt%, Cr: 5-15wt%, and Mo: 2-8wt%.

[0012] Furthermore, the composition of the Ni-Cr-Al-Y alloy is Ni: 68-72wt%, Cr: 14-16wt%, Al: 8-12wt%, Y: 4-6wt%.

[0013] Furthermore, the WC-reinforced Ni-based composite coating also contains boron (B) at a content of 1-3 wt%, which is used to lower the melting point of the coating.

[0014] Furthermore, the composition of the WC-reinforced Ni-based composite coating is WC: 64-66wt%, Ni: 28-32wt%, Cr: 2-4wt%, and B: 1-3wt%.

[0015] Furthermore, the composition of the WC-reinforced Ni-based composite coating is WC: 65wt%, Ni: 30wt%, Cr: 3wt%, B: 2wt%.

[0016] Furthermore, the composition of the Al-Fe-Cr-Mo amorphous alloy is Al: 65wt%, Fe: 20wt%, Cr: 10wt%, Mo: 5wt%.

[0017] Furthermore, the composition of the Ni-Cr-Al-Y alloy is Ni: 70wt%, Cr: 15wt%, Al: 10wt%, Y: 5wt%.

[0018] A method for preparing wear-resistant and corrosion-resistant rollers based on electrostatic galvanized sheet metal includes the following steps: Step S1. Sandblasting treatment of the roller body: Use white corundum sand with a particle size of 16-30 mesh and a blasting pressure of 0.5MPa to make the surface roughness Ra of the roller body reach 3.2-6.3μm; Step S2. Ultrasonic cleaning of the roller body: Use an alkaline cleaning agent with pH=11 (composition: Na3PO4 5wt%, Na2CO3 2wt%), temperature 60℃, ultrasonic cleaning time 15min; Step S3. Amorphization pretreatment of the roller body: Laser shock peening (LSP) is performed on the surface of the roller body with a pulse energy of 5J, a pulse width of 20ns, a spot diameter of 3mm, and a coverage of 100%, so that the surface grains are refined to the nanoscale (≤100nm).

[0019] Step S4. Deposit a conductive adhesive layer on the surface of the roller body: Deposit the conductive adhesive layer using an arc ion plating machine. The parameters of the arc ion plating machine are: vacuum degree ≤ 5 × 10⁻⁶. -3Pa, bias voltage -150V, target material is Ni-Cr-Al-Y alloy, the composition of Ni-Cr-Al-Y alloy is Ni:70wt%, Cr:15wt%, Al:10wt%, Y:5wt%; arc current 150A, deposition time 40min, roller body rotation speed 5rpm during deposition process to ensure coating thickness uniformity of ±5μm.

[0020] Step S5. Coating a corrosion-resistant transition layer onto the surface of the conductive adhesive layer: Laser cladding is performed on the surface of the conductive adhesive layer using a laser. The specific process parameters are as follows: The powder material is an Al-Fe-Cr-Mo alloy, the composition of which is Al: 65wt%, Fe: 20wt%, Cr: 10wt%, Mo: 5wt%, and the particle size is 45-106μm; Powder feeding method: synchronous powder feeding, powder feeding rate 15g / min.

[0021] Step S6. Spraying an anti-wear functional layer onto the surface of the corrosion-resistant transition layer: Before spraying, induction heating is used to raise the surface temperature of the corrosion-resistant transition layer to 150℃ to reduce the thermal stress difference between the coating and the substrate; the anti-wear functional layer is sprayed onto the surface of the corrosion-resistant transition layer using a spray gun with high-speed oxygen-fuel spraying technology. The technical parameters of the spray gun are: fuel: propane, flow rate 30L / min; oxygen flow rate 800SLPM; spraying distance: 300mm; spraying angle: 85-90°; coating thickness control: real-time monitoring by a laser displacement sensor, error ≤±2μm; powder material: WC-Ni based composite powder, the composition of which is: WC: 65wt%, Ni: 30wt%, Cr: 3wt%, B: 2wt%, particle size 15-45μm.

[0022] Step S7. Sealing treatment: A SiO2 sealing layer with a thickness of 2-3 μm and a sealing rate of ≥95% is deposited on the coating surface using the sol-gel method.

[0023] Step S8. Stress-relief annealing: The sealed roller is sent into a vacuum furnace and heated to 300°C at a rate of 50°C / h. After holding at this temperature for 2 hours, it is cooled with the furnace to eliminate residual stress in the coating.

[0024] Furthermore, in step S5, the laser used is a 5kW fiber laser with a wavelength of 1070nm; the scanning strategy is multi-layer, multi-channel overlap with an overlap rate of 40% and a scanning speed of 800mm / min; the protective gas is Ar gas with a flow rate of 15L / min to prevent oxidation of the molten pool.

[0025] The beneficial effects of this invention are as follows: This invention achieves a roller life of over 12 months through gradient functional design, application of amorphous alloys, and multi-process collaborative control, which is 300% higher than traditional technology. Attached Figure Description

[0026] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort: Figure 1 This is a schematic diagram of the structure of the wear-resistant and corrosion-resistant roller produced by electrostatic galvanized sheet according to the present invention; Figure 2 This is a flowchart of the preparation method of the wear-resistant and corrosion-resistant roller of the present invention. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper surface," "lower surface," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "forward," "reverse," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] Example 1 like Figure 1 As shown, an anti-wear and corrosion-resistant roller produced based on electrostatic galvanized sheet includes a roller body 1. The surface of the roller body 1 is provided with an anti-wear and corrosion-resistant coating. The anti-wear and corrosion-resistant coating consists of a conductive adhesive layer 2, a corrosion-resistant transition layer 3, and an anti-wear functional layer 4 from the inside to the outside.

[0030] The conductive adhesive layer 2 is a Ni-Cr-Al-Y alloy with a resistivity ≤1.2×10-6Ω·m; The wear-resistant functional layer 4 is a WC-reinforced Ni-based composite coating with a microhardness ≥1200HV and an angle between the orientation of the WC particles and the normal ≤15°.

[0031] The corrosion-resistant transition layer 3 is an Al-Fe-Cr-Mo amorphous alloy with a zinc liquid corrosion rate ≤0.01mm / year; the composition of the Al-Fe-Cr-Mo amorphous alloy is Al:58wt%, Fe:25wt%, Cr:15wt%, Mo:2wt%.

[0032] The composition of the Ni-Cr-Al-Y alloy is Ni: 68wt%, Cr: 16wt%, Al: 12wt%, Y: 4wt%.

[0033] The WC-reinforced Ni-based composite coating also contains boron (B), with a B content of 1-3 wt%, to lower the coating's melting point. Specifically, the composition of the WC-reinforced Ni-based composite coating is WC: 64 wt%, Ni: 32 wt%, Cr: 3 wt%, and B: 1 wt%.

[0034] Example 2 The wear-resistant and corrosion-resistant roller produced based on electrostatic galvanized sheet includes a roller body, the surface of which is provided with a wear-resistant and corrosion-resistant coating, the wear-resistant and corrosion-resistant coating consisting of a conductive adhesive layer, a corrosion-resistant transition layer and a wear-resistant functional layer from the inside out.

[0035] The conductive bonding layer is a Ni-Cr-Al-Y alloy with a resistivity ≤1.2×10-6Ω·m; the corrosion-resistant transition layer is an Al-Fe-Cr-Mo amorphous alloy with a zinc liquid corrosion rate ≤0.01mm / year; and the wear-resistant functional layer is a WC-reinforced Ni-based composite coating with a microhardness ≥1200HV and an angle between the oriented WC particles and the normal ≤15°.

[0036] The Al-Fe-Cr-Mo amorphous alloy has the following composition: Al: 72wt%, Fe: 15wt%, Cr: 5wt%, Mo: 8wt%; the Ni-Cr-Al-Y alloy has the following composition: Ni: 72wt%, Cr: 14wt%, Al: 8wt%, Y: 6wt%.

[0037] The composition of the WC-reinforced Ni-based composite coating is WC: 66wt%, Ni: 27wt%, Cr: 4wt%, and B: 3wt%.

[0038] Example 3 The wear-resistant and corrosion-resistant roller produced based on electrostatic galvanized sheet includes a roller body, the surface of which is provided with a wear-resistant and corrosion-resistant coating, the wear-resistant and corrosion-resistant coating consisting of a conductive adhesive layer, a corrosion-resistant transition layer and a wear-resistant functional layer from the inside out.

[0039] The conductive adhesive layer is a Ni-Cr-Al-Y alloy with a resistivity ≤1.2×10-6Ω·m; the composition of the Ni-Cr-Al-Y alloy is Ni:70wt%, Cr:15wt%, Al:10wt%, Y:5wt%.

[0040] The corrosion-resistant transition layer is an Al-Fe-Cr-Mo amorphous alloy with a zinc liquid corrosion rate ≤0.01mm / year; the composition of the Al-Fe-Cr-Mo amorphous alloy is Al:65wt%, Fe:20wt%, Cr:10wt%, Mo:5wt%.

[0041] The wear-resistant functional layer is a WC-reinforced Ni-based composite coating with a microhardness ≥1200 HV and an angle between the orientation of the WC particles and the normal ≤15°. The composition of the WC-reinforced Ni-based composite coating is WC: 65wt%, Ni: 30wt%, Cr: 3wt%, and B: 2wt%.

[0042] like Figure 2 As shown, a method for preparing wear-resistant and corrosion-resistant rollers based on electrostatically galvanized sheet includes the following steps: Step S1. Sandblasting treatment of the roller body: Use white corundum sand with a particle size of 16-30 mesh and a blasting pressure of 0.5MPa to make the surface roughness Ra of the roller body reach 3.2-6.3μm; Step S2. Ultrasonic cleaning of the roller body: Use an alkaline cleaning agent with pH=11 (composition: Na3PO4 5wt%, Na2CO3 2wt%), temperature 60℃, ultrasonic cleaning time 15min; Step S3. Amorphization pretreatment of the roller body: Laser shock peening (LSP) is performed on the surface of the roller body with a pulse energy of 5J, a pulse width of 20ns, a spot diameter of 3mm, and a coverage of 100%, so that the surface grains are refined to the nanoscale (≤100nm).

[0043] Step S4. Deposit a conductive adhesive layer on the surface of the roller body: Deposit the conductive adhesive layer using an arc ion plating machine. The parameters of the arc ion plating machine are: vacuum degree ≤ 5 × 10⁻⁶. -3 Pa, bias voltage -150V, target material is Ni-Cr-Al-Y alloy, the composition of Ni-Cr-Al-Y alloy is Ni:70wt%, Cr:15wt%, Al:10wt%, Y:5wt%; arc current 150A, deposition time 40min, roller body rotation speed 5rpm during deposition process to ensure coating thickness uniformity of ±5μm.

[0044] Step S5. Coating a corrosion-resistant transition layer onto the surface of the conductive adhesive layer: Laser cladding is performed on the surface of the conductive adhesive layer using a laser. Specific process parameters are as follows: The powder material is an Al-Fe-Cr-Mo alloy, with the following composition: Al: 65wt%, Fe: 20wt%, Cr: 10wt%, Mo: 5wt%, and particle size: 45-106μm; Powder feeding method: synchronous powder feeding at a rate of 15g / min. The laser used is a 5kW fiber laser with a wavelength of 1070nm; the scanning strategy is multi-layer, multi-channel overlapping with an overlap rate of 40% and a scanning speed of 800mm / min; the protective gas is Ar gas with a flow rate of 15L / min to prevent oxidation of the molten pool.

[0045] Step S6. Spray an anti-wear functional layer onto the surface of the corrosion-resistant transition layer: Before spraying, induction heating is used to raise the surface temperature of the corrosion-resistant transition layer to 150°C to reduce the thermal stress difference between the coating and the substrate; A high-speed oxygen-fuel spraying technology spray gun is used to spray an anti-wear functional layer on the surface of the corrosion-resistant transition layer. The technical parameters of the spray gun are: fuel: propane, flow rate 30L / min; oxygen flow rate 800SLPM; spraying distance: 300mm; spraying angle: 85-90°. Coating thickness control: Real-time monitoring via laser displacement sensor, with an error ≤ ±2μm; Powder material: WC-Ni based composite powder, wherein the composition of the WC-Ni based composite powder is: WC: 65wt%, Ni: 30wt%, Cr: 3wt%, B: 2wt%, and the particle size is 15-45μm.

[0046] Step S7. Sealing treatment: A SiO2 sealing layer with a thickness of 2-3 μm and a sealing rate of ≥95% is deposited on the coating surface using the sol-gel method.

[0047] Step S8. Stress-relief annealing: The sealed roller is sent into a vacuum furnace and heated to 300°C at a rate of 50°C / h. After holding at this temperature for 2 hours, it is cooled with the furnace to eliminate residual stress in the coating.

[0048] Performance comparison tests are shown in Table 1: Table 1 Comparison of Example 3 of this application with conventional chromium plating. Test Project The coating of this invention Traditional chromium plating Increase Corrosion rate of zinc liquid at 500℃ 0.008mm / year 0.25mm / year 96.8% Wear amount (1000 revolutions) 0.02mg 0.15mg 86.7% Coating lifespan 12 months 3 months 300% Electrostatic adsorption efficiency 98.5% 75.0% 31.3% The key innovations of this application are as follows: 1. Amorphous alloy transition layer: achieved through rapid cooling (cooling rate ≥ 10). 5 K / s) forms an amorphous structure, blocking the corrosion path of the zinc liquid to the substrate; 2. Oriented alignment of WC particles: The high-speed airflow (Ma≥2.5) of HVOF spraying causes WC particles to orient along the airflow direction, forming a "hard particle barrier"; 3. Multi-process synergistic control: LSP pretreatment refines the substrate grains, improving the bonding strength between the coating and the substrate (≥80MPa). 4. Sealing-annealing synergistic post-treatment: The sealing layer prevents corrosive media from penetrating, and annealing eliminates residual stress, thereby improving the coating's thermal shock resistance by 2 times.

[0049] Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those embodiments or examples, without contradiction. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A wear-resistant and corrosion-resistant roller produced from electrostatically galvanized sheet, comprising a roller body, wherein the surface of the roller body is provided with a wear-resistant and corrosion-resistant coating, characterized in that: The wear-resistant and corrosion-resistant coating consists of, from the inside out, a conductive bonding layer, a corrosion-resistant transition layer, and an wear-resistant functional layer; wherein, the conductive bonding layer is a Ni-Cr-Al-Y alloy with a resistivity ≤1.2×10⁻⁶. -6 The corrosion-resistant transition layer is an Al-Fe-Cr-Mo amorphous alloy with a zinc liquid corrosion rate ≤0.01mm / year; the wear-resistant functional layer is a WC-reinforced Ni-based composite coating with a microhardness ≥1200HV and an WC particle orientation angle ≤15° with the normal.

2. The wear-resistant and corrosion-resistant roller produced from electrostatic galvanized sheet according to claim 1, characterized in that: The composition of the Al-Fe-Cr-Mo amorphous alloy is Al: 58-72wt%, Fe: 15-25wt%, Cr: 5-15wt%, and Mo: 2-8wt%.

3. The wear-resistant and corrosion-resistant roller produced based on electrostatic galvanized sheet according to claim 2, characterized in that: The composition of the Ni-Cr-Al-Y alloy is Ni: 68-72wt%, Cr: 14-16wt%, Al: 8-12wt%, Y: 4-6wt%.

4. The wear-resistant and corrosion-resistant roller produced based on electrostatic galvanized sheet according to claim 3, characterized in that: The WC-reinforced Ni-based composite coating also contains boron (B) at a content of 1-3 wt%, which is used to lower the melting point of the coating.

5. The wear-resistant and corrosion-resistant roller produced based on electrostatic galvanized sheet according to claim 4, characterized in that: The composition of the WC-reinforced Ni-based composite coating is WC: 64-66wt%, Ni: 28-32wt%, Cr: 2-4wt%, and B: 1-3wt%.

6. The wear-resistant and corrosion-resistant roller produced based on electrostatic galvanized sheet according to claim 5, characterized in that: The composition of the WC-reinforced Ni-based composite coating is WC: 65wt%, Ni: 30wt%, Cr: 3wt%, B: 2wt%.

7. The wear-resistant and corrosion-resistant roller produced based on electrostatic galvanized sheet according to claim 6, characterized in that: The composition of the Al-Fe-Cr-Mo amorphous alloy is Al: 65wt%, Fe: 20wt%, Cr: 10wt%, and Mo: 5wt%.

8. The wear-resistant and corrosion-resistant roller produced based on electrostatic galvanized sheet according to claim 8, characterized in that: The composition of the Ni-Cr-Al-Y alloy is Ni: 70wt%, Cr: 15wt%, Al: 10wt%, Y: 5wt%.

9. A method for preparing wear-resistant and corrosion-resistant rollers based on electrostatically galvanized sheet metal as described in claim 8, characterized in that, Includes the following steps: Step S1. Sandblasting treatment of the roller body: Use white corundum sand with a particle size of 16-30 mesh and a blasting pressure of 0.5MPa to make the surface roughness Ra of the roller body reach 3.2-6.3μm; Step S2. Ultrasonic cleaning of the roller body: Use an alkaline cleaning agent with pH=11, temperature 60℃, ultrasonic cleaning time 15min; Step S3. Amorphization pretreatment of the roller body: Laser shock peening is performed on the surface of the roller body with a pulse energy of 5J, a pulse width of 20ns, a spot diameter of 3mm, and a coverage of 100%, so that the surface grains are refined to the nanoscale. Step S4. Deposit a conductive adhesive layer on the surface of the roller body: Deposit the conductive adhesive layer using an arc ion plating machine. The parameters of the arc ion plating machine are: vacuum degree ≤ 5 × 10⁻⁶. -3 Pa, bias voltage -150V, target material is Ni-Cr-Al-Y alloy, the composition of Ni-Cr-Al-Y alloy is Ni:70wt%, Cr:15wt%, Al:10wt%, Y:5wt%; arc current 150A, deposition time 40min, roller body rotation speed 5rpm during deposition process to make coating thickness uniformity ±5μm. Step S5. Coating a corrosion-resistant transition layer onto the surface of the conductive adhesive layer: Laser cladding is performed on the surface of the conductive adhesive layer using a laser. Specific process parameters are as follows: The powder material is an Al-Fe-Cr-Mo alloy, with the following composition: Al: 65wt%, Fe: 20wt%, Cr: 10wt%, Mo: 5wt%, and particle size: 45-106μm; Powder feeding method: synchronous powder feeding at a rate of 15g / min. Step S6. Spraying an anti-wear functional layer onto the surface of the corrosion-resistant transition layer: Before spraying, induction heating is used to raise the surface temperature of the corrosion-resistant transition layer to 150℃ to reduce the thermal stress difference between the coating and the substrate; the anti-wear functional layer is sprayed onto the surface of the corrosion-resistant transition layer using a spray gun with high-speed oxygen-fuel spraying technology. The technical parameters of the spray gun are: fuel: propane, flow rate 30L / min; oxygen flow rate 800SLPM; spraying distance: 300mm; spraying angle: 85-90°; coating thickness control: real-time monitoring by a laser displacement sensor, error ≤±2μm; powder material: WC-Ni based composite powder, the composition of which is: WC: 65wt%, Ni: 30wt%, Cr: 3wt%, B: 2wt%, particle size 15-45μm; Step S7. Sealing treatment: A SiO2 sealing layer with a thickness of 2-3 μm and a sealing rate of ≥95% is deposited on the coating surface using the sol-gel method. Step S8. Stress-relief annealing: The sealed roller is sent into a vacuum furnace and heated to 300°C at a rate of 50°C / h. After holding at this temperature for 2 hours, it is cooled with the furnace to eliminate residual stress in the coating.

10. The method for preparing wear-resistant and corrosion-resistant rollers based on electrostatically galvanized sheet metal according to claim 9, characterized in that, In step S5, a 5kW fiber laser with a wavelength of 1070nm is used; the scanning strategy is multi-layer, multi-channel overlap with an overlap rate of 40% and a scanning speed of 800mm / min; the protective gas is Ar gas with a flow rate of 15L / min to prevent oxidation of the molten pool.

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