Welding wire for surface of membrane type water-cooled wall and surfacing welding process of welding wire

Abstract

The invention discloses a welding wire for the surface of a membrane type water cooling wall and a surfacing technology of the welding wire, and relates to the technical field of welding wire surfacing, according to the scheme, the formula of a nickel-based welding wire is adjusted, the dosage of chemical components such as Nb, Ta and Ti is limited, and the welding wire comprises the following chemical components in percentage by mass: less than or equal to 0.10% of C, 20.00%-31.00% of Cr, 8.00%-10.00% of Mo, less than or equal to 0.40% of Al, less than or equal to 0.60% of Ti, less than or equal to 5.00% of Fe, 3.15%-4.35% of Nb + Ta, less than or equal to 0.50% of Si, less than or equal to 0.50% of Mn and the balance of Ni; the nickel-based welding wire with excellent corrosion resistance and wear resistance is prepared, and the welding wire is excellent in surfacing effect, good in flowability and welding performance and capable of meeting the surface surfacing repair requirement of the membrane type water cooling wall.

Description

Technical Field

[0001] The invention relates to the technical field of welding wire surfacing, in particular to a welding wire for the surface of a membrane water-cooled wall and a surfacing process thereof. Background Art

[0002] The membrane water-cooled wall is a straight welded assembly composed of fins and light tubes. It has good airtightness, can absorb the heat radiation of the furnace flame, and protect the boiler wall. It has been widely used in modern boiler structures. However, the service environment of the membrane water-cooled wall is relatively harsh. It is very susceptible to high temperature corrosion and surface erosion such as high temperature in the boiler and flue gas, which leads to safety hazards in the operation of the boiler. Therefore, it is of great practical significance to protect the surface of the membrane wall tube screen.

[0003] When replacing or repairing the membrane water wall, the post-weld heat treatment is usually done by surfacing, which is a metallurgical combination with a high density of surfacing layer. At the same time, wear-resistant, corrosion-resistant or high-temperature resistant materials can be flexibly selected according to actual conditions, which has attracted wide attention in the industry. The relevant research on the welding manufacturing technology of the membrane water wall is relatively mature, but the research on the surface surfacing of the membrane water wall has been rarely studied.

[0004] Therefore, based on this situation, the present application discloses a welding wire for the surface of a membrane water-cooled wall and a surfacing process thereof to achieve surfacing repair of the surface of the membrane water-cooled wall. Summary of the invention

[0005] The object of the present invention is to provide a welding wire for the surface of a membrane water-cooled wall and a surfacing process thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a preparation process of a welding wire for a membrane water-cooled wall surface, the preparation process specifically comprising: batching according to alloy components, vacuum melting, casting to form an alloy ingot, transferring to a heating furnace, calcining at 1150-1200°C, the final calcining temperature is 950°C, hot rolling to form a wire material, the hot rolling temperature is 1100-1250°C; using sulfuric acid to clean the hot-rolled wire material, and drawing in multiple passes to obtain a welding wire with a diameter of 2 mm; The chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 20.00%~31.00%, Mo: 8.00%~10.00%, Al≤0.40%, Ti≤0.60%, Fe≤5.00%, Nb+Ta: 3.15%~4.35%, Si≤0.50%, Mn≤0.50%, and the balance is Ni.

[0007] In a more optimized solution, the chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 20.00%~23.00%, Mo: 8.00%~10.00%, Al≤0.40%, Ti≤0.40%, Fe≤5.00%, Nb+Ta: 3.15%~4.15%, Si≤0.50%, Mn≤0.50%, and the balance is Ni.

[0008] In a more optimized solution, the Nb content is m1, the Ta content is m2, and the ratio of m1 / m2 is 0.72~1.56.

[0009] In a more optimized solution, the Ti content is m3, and the ratio of m1 / m3 is 3.5~4.5.

[0010] The more optimized solution is to plate a nickel layer on the surface of the welding wire. The specific steps are: immersing the welding wire in a nickel plating solution, electroplating a composite nickel layer on the surface of the welding wire; the current density is 8~10A / dm 2 , temperature is 30~35℃, plating time is 1~2h, pH is 3.5; The dosage of each component of the nickel plating solution is: 180-200 g / L of ammonium citrate, 120-130 g / L of nickel sulfate hexahydrate, 20-30 g / L of chromium trichloride hexahydrate, 6-8 g / L of sodium molybdate, 8-10 g / L of ascorbic acid, 14-15 g / L of boric acid, 10-12 g / L of ammonium bromide, 0.05-0.1 g / L of sodium dodecyl sulfate, and 8-16 g / L of nickel-coated nanoparticles.

[0011] In a more optimized solution, the steps for preparing the nickel-coated nanoparticles are as follows: Step S1: taking nanoparticles, immersing them in a sensitizing solution, ultrasonically sensitizing for 5-10 minutes, ultrasonically activating them with an activating solution for 5-10 minutes, at an activation temperature of 45-50°C, and washing and drying; the nanoparticles include titanium dioxide and rare earth oxides, the mass ratio of titanium dioxide to rare earth oxides being (1.5-2):1; the rare earth oxides are any one or more of cerium oxide and lanthanum oxide; Step S2: placing the activated nanoparticles in a chemical plating solution, chemically plating nickel on the surface at 85-95° C., the chemical plating time is 20-30 min, the stirring speed is 80-100 r / min, the pH is 12.5, and nickel-coated nanoparticles are obtained.

[0012] In a more optimized solution, the sensitizing solution is a mixture of 16 g / L stannous chloride and 40 mL / L hydrochloric acid; the activating solution is a mixture of 0.3 g / L palladium chloride and 4 mL / L hydrochloric acid; the dosage of each component of the chemical plating solution is specifically as follows: 20-40 g / L nickel sulfate hexahydrate, 80-120 mL / L hydrazine, 10-20 g / L sodium tartrate, 50-60 mL / L ammonia water, 1-3 mg / L thiourea, and 12-15 g / L sodium acetate.

[0013] A more optimized solution is a welding wire for the surface of a membrane water-cooled wall prepared according to any of the preparation processes described above.

[0014] A more optimized solution is a surfacing process, which uses the welding wire described in the above preparation method to perform single-layer single-pass surfacing or single-pass multi-layer surfacing on the surface of the substrate by metal-metal gas shielded welding. The welding current is 160~220A, the swing frequency is 6~14Hz, and the welding speed is 900~1000mm / min; the shielding gas is argon, and the gas flow rate is 10~20L / min.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention discloses a welding wire for the surface of a membrane water-cooled wall and a surfacing process thereof, the scheme adjusts the formula of the nickel-based welding wire, and limits the dosage of chemical components such as Nb, Ta, and Ti to obtain a nickel-based welding wire with excellent corrosion resistance and wear resistance, and the welding wire has excellent surfacing effect, good fluidity and welding performance, and can meet the surfacing repair needs of the membrane water-cooled wall surface.

[0016] In this scheme, the present application defines the formula A of the welding wire as "the chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 20.00%~31.00%, Mo: 8.00%~10.00%, Al≤0.40%, Ti≤0.60%, Fe≤5.00%, Nb+Ta: 3.15%~4.35%, Si≤0.50%, Mn≤0.50%, and the balance is Ni"; formula B is ... The composition is: by mass fraction, C≤0.10%, Cr: 20.00%~23.00%, Mo: 8.00%~10.00%, Al≤0.40%, Ti≤0.40%, Fe≤5.00%, Nb+Ta: 3.15%~4.15%, Si≤0.50%, Mn≤0.50%, and the balance is Ni". Under these two formulations, the prepared nickel-based welding wire has excellent corrosion resistance and wear resistance.

[0017] On this basis, the plan further limits the usage of chemical components such as Nb, Ta, and Ti, specifically "the Nb content is m1, the Ta content is m2, and the ratio of m1 / m2 is 0.72~1.56. The Ti content is m3, and the ratio of m1 / m3 is 3.5~4.5", so as to improve the surfacing performance of the welding wire and reduce the DDC crack sensitivity.

[0018] At the same time, the plan also nickel-plates the surface of the welding wire. The nickel-plating solution is prepared with "nickel sulfate hexahydrate 120~130g / L, chromium trichloride hexahydrate 20~30g / L, sodium molybdate 6~8g / L" as the main components. A nickel-chromium-molybdenum coating is electroplated on the surface of the welding wire, and nickel-coated nanoparticles are introduced into the coating. The nanoparticles include titanium dioxide and rare earth oxides. The nickel-coated nanoparticles can not only act as nucleation particles to refine the grains of the cladding metal, but also enhance the cladding layer, thereby improving its wear resistance, corrosion resistance, and mechanical properties.

[0019] It should be reminded here: the plan pre-processes the surface of the nanoparticles with chemical nickel plating to obtain nickel-coated nanoparticles. The purpose of nickel plating on the surface of the nanoparticles is to improve the distribution of the nanoparticles in the cladding system, so that they are evenly located in the cladding layer, and the grain boundary pinning effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a diagram showing the actual surfacing effect of the welding wire disclosed in Example 6 of the present invention. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: A preparation process for a welding wire for the surface of a membrane water-cooled wall, the preparation process specifically comprising: preparing materials according to alloy components, vacuum melting, casting to form alloy ingots, transferring to a heating furnace, calcining at 1200°C, with a final calcination temperature of 950°C, hot rolling to form wire, with a hot rolling temperature of 1100°C; cleaning the hot-rolled wire with sulfuric acid, and drawing in multiple passes to obtain a welding wire with a diameter of 2 mm.

[0023] The chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 28.00%, Mo: 8.00%, Al≤0.40%, Ti: 0.54%, Fe≤5.00%, Nb: 1.95%, Ta: 1.85%, Si≤0.50%, Mn≤0.50%, and the balance is Ni. The Nb content is m1, the Ta content is m2, and the ratio of m1 / m2 is 1.05. The Ti content is m3, and the ratio of m1 / m3 is 3.6.

[0024] Example 2: A preparation process for a welding wire for the surface of a membrane water-cooled wall, the preparation process specifically comprising: preparing materials according to the alloy components, vacuum melting, casting to form an alloy ingot, transferring to a heating furnace, calcining at 1200°C, with a final calcination temperature of 950°C, hot rolling to form a wire, with a hot rolling temperature of 1100°C; cleaning the hot-rolled wire with sulfuric acid, and drawing in multiple passes to obtain a welding wire with a diameter of 2 mm.

[0025] The chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 25.00%, Mo: 8.00%, Al≤0.40%, Ti: 0.54%, Fe≤5.00%, Nb: 1.95%, Ta: 1.85%, Si≤0.50%, Mn≤0.50%, and the balance is Ni. The Nb content is m1, the Ta content is m2, and the ratio of m1 / m2 is 1.05. The Ti content is m3, and the ratio of m1 / m3 is 3.6.

[0026] Example 3: A preparation process for a welding wire for the surface of a membrane water-cooled wall, the preparation process specifically comprising: preparing materials according to the alloy components, vacuum melting, casting to form an alloy ingot, transferring to a heating furnace, calcining at 1200°C, with a final calcination temperature of 950°C, hot rolling to form a wire, with a hot rolling temperature of 1100°C; using sulfuric acid to clean the hot-rolled wire, and drawing in multiple passes to obtain a welding wire with a diameter of 2 mm.

[0027] The chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 23.00%, Mo: 8.00%, Al≤0.40%, Ti: 0.54%, Fe≤5.00%, Nb: 1.95%, Ta: 1.85%, Si≤0.50%, Mn≤0.50%, and the balance is Ni. The Nb content is m1, the Ta content is m2, and the ratio of m1 / m2 is 1.05. The Ti content is m3, and the ratio of m1 / m3 is 3.6.

[0028] Example 4: A preparation process for a welding wire for the surface of a membrane water-cooled wall, the preparation process specifically comprising: preparing materials according to the alloy components, vacuum melting, casting to form an alloy ingot, transferring to a heating furnace, calcining at 1200°C, with a final calcination temperature of 950°C, hot rolling to form a wire, with a hot rolling temperature of 1100°C; using sulfuric acid to clean the hot-rolled wire, and performing multiple drawing to obtain a welding wire with a diameter of 2 mm.

[0029] The chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 23.00%, Mo: 8.00%, Al≤0.40%, Ti: 0.54%, Fe≤5.00%, Nb: 1.95%, Ta: 1.85%, Si≤0.50%, Mn≤0.50%, and the balance is Ni. The Nb content is m1, the Ta content is m2, and the ratio of m1 / m2 is 1.05. The Ti content is m3, and the ratio of m1 / m3 is 3.6.

[0030] The nickel layer is plated on the surface of the welding wire. The specific steps are: immersing the welding wire in a nickel plating solution, electroplating a composite nickel plating layer on the surface of the welding wire; the current density is 8A / dm 2 , temperature is 35°C, electroplating time is 1h, pH is 3.5. The dosage of each component of the nickel plating solution is: 195g / L ammonium citrate, 120g / L nickel sulfate hexahydrate, 30g / L chromium trichloride hexahydrate, 6g / L sodium molybdate, 8.5g / L ascorbic acid, 14g / L boric acid, 10g / L ammonium bromide, 0.1g / L sodium dodecyl sulfate, and 10g / L nickel-coated nanoparticles.

[0031] The preparation steps of the nickel-coated nanoparticles are as follows: Step S1: Take nanoparticles, immerse them in sensitizing solution, ultrasonically sensitize for 5 minutes, ultrasonically activate them with activation solution for 5 minutes, the activation temperature is 45°C, and then wash and dry them; the nanoparticles include titanium dioxide and rare earth oxides, the mass ratio of titanium dioxide and rare earth oxides is 1.5:1; the rare earth oxides are compounded in cerium oxide and lanthanum oxide, the mass ratio is 1:1. The sensitizing solution is a mixture of 16g / L stannous chloride and 40mL / L hydrochloric acid; the activation solution is a mixture of 0.3g / L palladium chloride and 4mL / L hydrochloric acid.

[0032] Step S2: placing the activated nanoparticles in a chemical plating solution, electrolessly plating nickel on the surface at 90°C, for 30 minutes, with a stirring speed of 80 r / min and a pH of 12.5, to obtain nickel-coated nanoparticles. The specific amounts of the components of the chemical plating solution are: 25 g / L nickel sulfate hexahydrate, 100 mL / L hydrazine, 20 g / L sodium tartrate, 50 mL / L ammonia water, 2 mg / L thiourea, and 15 g / L sodium acetate.

[0033] Example 5: A preparation process for a welding wire for the surface of a membrane water-cooled wall, the specific preparation process is: batching according to the alloy components, vacuum melting, casting to form an alloy ingot, transferring to a heating furnace, calcining at 1200°C, the final calcination temperature is 950°C, hot rolling to form wire, the hot rolling temperature is 1100°C; the hot-rolled wire is cleaned with sulfuric acid, and multiple drawing is performed to obtain a welding wire with a diameter of 2 mm.

[0034] The chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 23.00%, Mo: 8.00%, Al≤0.40%, Ti: 0.54%, Fe≤5.00%, Nb: 1.95%, Ta: 1.85%, Si≤0.50%, Mn≤0.50%, and the balance is Ni. The Nb content is m1, the Ta content is m2, and the ratio of m1 / m2 is 1.05. The Ti content is m3, and the ratio of m1 / m3 is 3.6.

[0035] The nickel layer is plated on the surface of the welding wire. The specific steps are: immersing the welding wire in a nickel plating solution, electroplating a composite nickel plating layer on the surface of the welding wire; the current density is 8A / dm 2 , temperature is 35°C, electroplating time is 1h, pH is 3.5. The dosage of each component of the nickel plating solution is: 195g / L ammonium citrate, 120g / L nickel sulfate hexahydrate, 30g / L chromium trichloride hexahydrate, 6g / L sodium molybdate, 8.5g / L ascorbic acid, 14g / L boric acid, 10g / L ammonium bromide, 0.1g / L sodium dodecyl sulfate, and 12.5g / L nickel-coated nanoparticles.

[0036] The preparation steps of the nickel-coated nanoparticles are as follows: Step S1: Take nanoparticles, immerse them in sensitizing solution, ultrasonically sensitize for 5 minutes, ultrasonically activate them with activation solution for 5 minutes, the activation temperature is 45°C, and then wash and dry them; the nanoparticles include titanium dioxide and rare earth oxides, the mass ratio of titanium dioxide and rare earth oxides is 1.5:1; the rare earth oxides are compounded in cerium oxide and lanthanum oxide, the mass ratio is 1:1. The sensitizing solution is a mixture of 16g / L stannous chloride and 40mL / L hydrochloric acid; the activation solution is a mixture of 0.3g / L palladium chloride and 4mL / L hydrochloric acid.

[0037] Step S2: placing the activated nanoparticles in a chemical plating solution, electrolessly plating nickel on the surface at 90°C, for 30 minutes, with a stirring speed of 80 r / min and a pH of 12.5, to obtain nickel-coated nanoparticles. The specific amounts of the components of the chemical plating solution are: 25 g / L nickel sulfate hexahydrate, 100 mL / L hydrazine, 20 g / L sodium tartrate, 50 mL / L ammonia water, 2 mg / L thiourea, and 15 g / L sodium acetate.

[0038] Example 6: A preparation process for a welding wire for the surface of a membrane water-cooled wall, the preparation process specifically comprising: preparing materials according to the alloy components, vacuum melting, casting to form an alloy ingot, transferring to a heating furnace, calcining at 1200°C, with a final calcination temperature of 950°C, hot rolling to form a wire, with a hot rolling temperature of 1100°C; using sulfuric acid to clean the hot-rolled wire, and performing multiple drawing to obtain a welding wire with a diameter of 2 mm.

[0039] The chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 23.00%, Mo: 8.00%, Al≤0.40%, Ti: 0.54%, Fe≤5.00%, Nb: 1.95%, Ta: 1.85%, Si≤0.50%, Mn≤0.50%, and the balance is Ni. The Nb content is m1, the Ta content is m2, and the ratio of m1 / m2 is 1.05. The Ti content is m3, and the ratio of m1 / m3 is 3.6.

[0040] The nickel layer is plated on the surface of the welding wire. The specific steps are: immersing the welding wire in a nickel plating solution, electroplating a composite nickel plating layer on the surface of the welding wire; the current density is 8A / dm 2 , temperature is 35°C, electroplating time is 1h, pH is 3.5. The dosage of each component of the nickel plating solution is: 195g / L ammonium citrate, 120g / L nickel sulfate hexahydrate, 30g / L chromium trichloride hexahydrate, 6g / L sodium molybdate, 8.5g / L ascorbic acid, 14g / L boric acid, 10g / L ammonium bromide, 0.1g / L sodium dodecyl sulfate, and 15g / L nickel-coated nanoparticles.

[0041] The preparation steps of the nickel-coated nanoparticles are as follows: Step S1: Take nanoparticles, immerse them in sensitizing solution, ultrasonically sensitize for 5 minutes, ultrasonically activate them with activation solution for 5 minutes, the activation temperature is 45°C, and then wash and dry them; the nanoparticles include titanium dioxide and rare earth oxides, the mass ratio of titanium dioxide and rare earth oxides is 1.5:1; the rare earth oxides are compounded in cerium oxide and lanthanum oxide, the mass ratio is 1:1. The sensitizing solution is a mixture of 16g / L stannous chloride and 40mL / L hydrochloric acid; the activation solution is a mixture of 0.3g / L palladium chloride and 4mL / L hydrochloric acid.

[0042] Step S2: placing the activated nanoparticles in a chemical plating solution, electrolessly plating nickel on the surface at 90°C, for 30 minutes, with a stirring speed of 80 r / min and a pH of 12.5, to obtain nickel-coated nanoparticles. The specific amounts of the components of the chemical plating solution are: 25 g / L nickel sulfate hexahydrate, 100 mL / L hydrazine, 20 g / L sodium tartrate, 50 mL / L ammonia water, 2 mg / L thiourea, and 15 g / L sodium acetate.

[0043] Comparative Example 1: Example 6 is used as the control group, and the nanoparticles in Comparative Example 1 are only titanium dioxide.

[0044] A preparation process for a welding wire for a membrane water-cooled wall surface, the preparation process specifically comprising: batching according to alloy components, vacuum melting, casting to form an alloy ingot, transferring to a heating furnace, calcining at 1200°C, final calcination temperature of 950°C, hot rolling to form a wire material, the hot rolling temperature of which is 1100°C; washing the hot-rolled wire material with sulfuric acid, and drawing in multiple passes to obtain a welding wire with a diameter of 2 mm.

[0045] The chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 23.00%, Mo: 8.00%, Al≤0.40%, Ti: 0.54%, Fe≤5.00%, Nb: 1.95%, Ta: 1.85%, Si≤0.50%, Mn≤0.50%, and the balance is Ni. The Nb content is m1, the Ta content is m2, and the ratio of m1 / m2 is 1.05. The Ti content is m3, and the ratio of m1 / m3 is 3.6.

[0046] The nickel layer is plated on the surface of the welding wire. The specific steps are: immersing the welding wire in a nickel plating solution, electroplating a composite nickel plating layer on the surface of the welding wire; the current density is 8A / dm 2 , temperature is 35°C, electroplating time is 1h, pH is 3.5. The dosage of each component of the nickel plating solution is: 195g / L ammonium citrate, 120g / L nickel sulfate hexahydrate, 30g / L chromium trichloride hexahydrate, 6g / L sodium molybdate, 8.5g / L ascorbic acid, 14g / L boric acid, 10g / L ammonium bromide, 0.1g / L sodium dodecyl sulfate, and 9g / L nickel-coated nanoparticles.

[0047] The preparation steps of the nickel-coated nanoparticles are as follows: Step S1: Take nanoparticles, immerse them in a sensitizing solution, ultrasonically sensitize for 5 minutes, ultrasonically activate them with an activating solution for 5 minutes, the activation temperature is 45°C, and then wash and dry them; the nanoparticles are titanium dioxide, the sensitizing solution is a mixture of 16g / L stannous chloride and 40mL / L hydrochloric acid; the activating solution is a mixture of 0.3g / L palladium chloride and 4mL / L hydrochloric acid.

[0048] Step S2: placing the activated nanoparticles in a chemical plating solution, electrolessly plating nickel on the surface at 90°C, for 30 minutes, with a stirring speed of 80 r / min and a pH of 12.5, to obtain nickel-coated nanoparticles. The specific amounts of the components of the chemical plating solution are: 25 g / L nickel sulfate hexahydrate, 100 mL / L hydrazine, 20 g / L sodium tartrate, 50 mL / L ammonia water, 2 mg / L thiourea, and 15 g / L sodium acetate.

[0049] Comparative Example 2: Example 6 was used as the control group. In Comparative Example 2, only nanoparticles were added without nickel coating.

[0050] A preparation process for a welding wire for a membrane water-cooled wall surface, the preparation process specifically comprising: batching according to alloy components, vacuum melting, casting to form an alloy ingot, transferring to a heating furnace, calcining at 1200°C, final calcination temperature of 950°C, hot rolling to form a wire material, the hot rolling temperature of which is 1100°C; washing the hot-rolled wire material with sulfuric acid, and drawing in multiple passes to obtain a welding wire with a diameter of 2 mm.

[0051] The chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 23.00%, Mo: 8.00%, Al≤0.40%, Ti: 0.54%, Fe≤5.00%, Nb: 1.95%, Ta: 1.85%, Si≤0.50%, Mn≤0.50%, and the balance is Ni. The Nb content is m1, the Ta content is m2, and the ratio of m1 / m2 is 1.05. The Ti content is m3, and the ratio of m1 / m3 is 3.6.

[0052] The nickel layer is plated on the surface of the welding wire. The specific steps are: immersing the welding wire in a nickel plating solution, electroplating a composite nickel plating layer on the surface of the welding wire; the current density is 8A / dm 2 , temperature is 35°C, electroplating time is 1h, pH is 3.5. The dosage of each component of the nickel plating solution is: 195g / L ammonium citrate, 120g / L nickel sulfate hexahydrate, 30g / L chromium trichloride hexahydrate, 6g / L sodium molybdate, 8.5g / L ascorbic acid, 14g / L boric acid, 10g / L ammonium bromide, 0.1g / L sodium dodecyl sulfate, and 15g / L nanoparticles.

[0053] The nanoparticles include titanium dioxide and rare earth oxide, wherein the mass ratio of the titanium dioxide to the rare earth oxide is 1.5:1; the rare earth oxide is compounded in cerium oxide and lanthanum oxide, wherein the mass ratio is 1:1.

[0054] Comparative Example 3: Example 6 was used as the control group, and nickel-coated nanoparticles were not added in Comparative Example 3.

[0055] A preparation process for a welding wire for a membrane water-cooled wall surface, the preparation process specifically comprising: batching according to alloy components, vacuum melting, casting to form an alloy ingot, transferring to a heating furnace, calcining at 1200°C, final calcination temperature of 950°C, hot rolling to form a wire material, the hot rolling temperature of which is 1100°C; washing the hot-rolled wire material with sulfuric acid, and drawing in multiple passes to obtain a welding wire with a diameter of 2 mm.

[0056] The chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 23.00%, Mo: 8.00%, Al≤0.40%, Ti: 0.54%, Fe≤5.00%, Nb: 1.95%, Ta: 1.85%, Si≤0.50%, Mn≤0.50%, and the balance is Ni. The Nb content is m1, the Ta content is m2, and the ratio of m1 / m2 is 1.05. The Ti content is m3, and the ratio of m1 / m3 is 3.6.

[0057] The nickel layer is plated on the surface of the welding wire. The specific steps are: immersing the welding wire in a nickel plating solution, electroplating a composite nickel plating layer on the surface of the welding wire; the current density is 8A / dm 2 , temperature is 35°C, electroplating time is 1h, pH is 3.5. The dosage of each component of the nickel plating solution is: 195g / L ammonium citrate, 120g / L nickel sulfate hexahydrate, 30g / L chromium trichloride hexahydrate, 6g / L sodium molybdate, 8.5g / L ascorbic acid, 14g / L boric acid, 10g / L ammonium bromide, and 0.1g / L sodium dodecyl sulfate.

[0058] Detection experiment: The welding wire prepared by the method disclosed in Examples 1 to 6 and Comparative Examples 1 to 3 was subjected to single-pass multi-layer surfacing welding on the surface of the substrate by gas metal arc welding, with a welding current of 220A, an oscillation frequency of 14Hz, and a welding speed of 1000mm / min; the shielding gas was argon gas, and the gas flow rate was 20L / min. The chemical composition of the substrate was: by mass fraction, C: 0.12%, Mn: 0.60%, Si: 0.25%, Cr: 0.8%, Mo: 0.55%, S≤0.030, P≤0.030, and the rest were iron and unavoidable impurity elements.

[0059] 1. Cut the cladding metal to a size of 10mm×30mm×5mm. Test the surface hardness with a load of 100gf and a loading time of 10s. Test 5 to 6 positions and take the average value. Test the wear resistance of the cladding metal sample by dry friction at 25°C with a load of 50N, a sliding stroke of 10mm / s, a friction time of 120min, and a friction ball of 6mm in diameter. Test the wear before and after the experiment.

[0060] 2. Cut the weld cladding metal sample with the size of 10mm×10mm×5mm, and test the corrosion resistance with reference to the method disclosed in JB / T7901-1999. Place the sample in a reaction container, use a hydrochloric acid solution with a mass concentration of 36%, the test temperature is 90℃, the test time is 3h, and the amount of acid used is 20mL per square centimeter of sample surface area. Weigh and calculate the corrosion amount before and after the test.

[0061] See Table 1 for specific data.

[0062] Table 1

[0063] Conclusion: This scheme adjusts the formula of nickel-based welding wire and limits the dosage of chemical components such as Nb, Ta, and Ti to produce a nickel-based welding wire with excellent corrosion resistance and wear resistance. The welding wire has excellent surfacing effect, good fluidity and welding performance, and can meet the needs of surfacing repair of membrane water-cooled wall surface.

[0064] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A process for preparing a welding wire for a membrane water-cooled wall surface, characterized in that: The specific preparation process is as follows: batching according to the alloy components, vacuum melting, casting to form alloy ingots, transferring to a heating furnace, calcining at 1150-1200°C, final calcination temperature of 950°C, hot rolling to form wire, hot rolling temperature of 1100-1250°C; washing the hot-rolled wire with sulfuric acid, and drawing in multiple passes to obtain a welding wire with a diameter of 2 mm; The chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 20.00%~31.00%, Mo: 8.00%~10.00%, Al≤0.40%, Ti≤0.60%, Fe≤5.00%, Nb+Ta: 3.15%~4.35%, Si≤0.50%, Mn≤0.50%, and the balance is Ni.

2. The process for preparing a membrane water-cooled wall surface welding wire according to claim 1, characterized in that: The chemical composition of the welding wire is: by mass fraction, C≤0.10%, Cr: 20.00%~23.00%, Mo: 8.00%~10.00%, Al≤0.40%, Ti≤0.40%, Fe≤5.00%, Nb+Ta: 3.15%~4.15%, Si≤0.50%, Mn≤0.50%, and the balance is Ni.

3. The process for preparing a membrane water-cooled wall surface welding wire according to claim 1, characterized in that: The Nb content is m1, the Ta content is m2, and the ratio of m1 / m2 is 0.72~1.

56.

4. The process for preparing a membrane water-cooled wall surface welding wire according to claim 1, characterized in that: The Ti content is m3, and the ratio of m1 / m3 is 3.5~4.

5.

5. The process for preparing a membrane water-cooled wall surface welding wire according to claim 1, characterized in that: The nickel layer is plated on the surface of the welding wire. The specific steps are: immersing the welding wire in a nickel plating solution, electroplating a composite nickel plating layer on the surface of the welding wire; the current density is 8~10A / dm 2 , temperature is 30~35℃, plating time is 1~2h, pH is 3.5; The dosage of each component of the nickel plating solution is: 180-200 g / L of ammonium citrate, 120-130 g / L of nickel sulfate hexahydrate, 20-30 g / L of chromium trichloride hexahydrate, 6-8 g / L of sodium molybdate, 8-10 g / L of ascorbic acid, 14-15 g / L of boric acid, 10-12 g / L of ammonium bromide, 0.05-0.1 g / L of sodium dodecyl sulfate, and 8-16 g / L of nickel-coated nanoparticles.

6. The process for preparing a membrane water-cooled wall surface welding wire according to claim 5, characterized in that: The preparation steps of the nickel-coated nanoparticles are: Step S1: taking nanoparticles, immersing them in a sensitizing solution, ultrasonically sensitizing for 5-10 minutes, ultrasonically activating them with an activating solution for 5-10 minutes, at an activation temperature of 45-50°C, and washing and drying; the nanoparticles include titanium dioxide and rare earth oxides, the mass ratio of titanium dioxide to rare earth oxides being (1.5-2):1; the rare earth oxides are any one or more of cerium oxide and lanthanum oxide; Step S2: placing the activated nanoparticles in a chemical plating solution, chemically plating nickel on the surface at 85-95° C., the chemical plating time is 20-30 min, the stirring speed is 80-100 r / min, the pH is 12.5, and nickel-coated nanoparticles are obtained.

7. The process for preparing a welding wire for a membrane water-cooled wall surface according to claim 6, characterized in that: The specific dosage of each component of the chemical plating solution is: nickel sulfate hexahydrate 20~40g / L, hydrazine 80~120mL / L, sodium tartrate 10~20g / L, ammonia water 50~60mL / L, thiourea 1~3mg / L, sodium acetate 12~15g / L.

8. A welding wire for the surface of a membrane water-cooled wall prepared according to the preparation process described in any one of claims 1 to 7.

9. A surfacing process, characterized in that: The welding wire described in claim 8 is used to perform single-layer single-pass cladding or single-pass multi-layer cladding on the surface of the substrate by metal-electrode gas shielded welding. The welding current is 160-220A, the oscillation frequency is 6-14Hz, and the welding speed is 900-1000mm / min. The shielding gas is argon gas, and the gas flow rate is 10-20L / min.

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