Weathering-resistant steel belt oxide skin coating process for intelligent lamp pole

Abstract

The invention discloses a weather-resistant steel strip oxide skin coating process for an intelligent lamp post, which comprises the following steps: 1) preparing a powder coating: taking furan resin powder, terpene resin particles, dinitrobenzoic acid, nickel phosphate, chromium sulfate, Fe (OH) 3 and zinc oxide as main raw materials, and uniformly mixing to obtain the powder coating; and (2) spraying the obtained powder coating on the surface of the intelligent lamp post directly formed by the weathering steel by adopting a powder electrostatic spraying process, and then heating, curing and preserving heat to obtain a coated part. When the coating technology is used, oxide scale removal pretreatment does not need to be conducted on the surface of the weathering resistant steel for the lamp pole, the engineering application progress can be effectively improved, the adhesive force, the weather fastness and the like of a surface coating obtained through coating with oxide scales are improved, the service life of the lamp pole is guaranteed, the related preparation technology is simple, the process cost is greatly reduced, and the method is suitable for industrial production. Popularization and application are facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of weathering steel surface protection, and specifically relates to an oxide coating process suitable for weathering steel used in smart lamp poles. Background Art

[0002] Smart light poles have become the information collection terminals and convenient service terminals of smart cities, and are an important entry point for smart cities. Most of the application scenarios are outdoors, and there are certain requirements for the material of the poles, which must not only be waterproof, anti-corrosive, but also anti-oxidation.

[0003] At present, there are two common methods for the anti-corrosion design of light poles: 1. Hot-rolled steel pipe → hot-dip galvanizing (or cold-dip galvanizing) → spraying plastic powder or spraying paint; 2. Hot-rolled steel pipe → shot peening (sandblasting) / pickling → spraying anti-corrosion paint. In method 1, the pole body is generally painted after galvanizing works such as pickling, hot-dip galvanizing, water washing, phosphating, and passivation. Hot-dip galvanizing is a key step in the anti-corrosion work of light poles. It is also commonly called hot-dip galvanizing and hot-dip galvanizing. It is often used in the anti-corrosion operations of metal structural facilities in various industries. This process mainly immerses the rust-free steel parts in the molten zinc liquid at about 500°C, so that the zinc layer is attached to the surface of the steel components, thereby achieving the purpose of anti-corrosion. However, pickling must be carried out before galvanizing. The acid mist generated by the pickling line and the discharged wastewater will pollute the environment and should be avoided as much as possible during the production process. In method 2, shot blasting / sand blasting is usually performed directly on the surface of the steel pipe, or directly pickled or washed with water to remove surface oil and iron oxide, and then sprayed with anti-corrosion paint; high corrosion resistant primer, high weather resistant topcoat, etc. can be used to paint the light pole to increase the service life and anti-corrosion years. However, the sand blasting and shot blasting process will produce irregular size, shape and coarse particle pollutants in the high-speed process, which also causes great pollution to the environment. The environmental impact assessment process is also very demanding, and it will also increase the cost of sand blasting equipment and labor.

[0004] Weathering steel has excellent corrosion resistance, and its atmospheric corrosion resistance is 4 times that of ordinary structural steel. Weathering steel can be used instead of ordinary carbon steel as the base material for the production of light poles. When making the inner surface of the light pole, weathering steel can be used directly without painting. However, the outside of the light pole faces harsh climates, and the corrosion resistance of the surface is higher, so it still needs to be painted. However, when weathering steel is painted with oxide scale, it is easy to cause problems such as poor surface coating adhesion and weatherability, and the service life of the light pole cannot be effectively guaranteed. Summary of the invention

[0005] The main purpose of the present invention is to provide a coating process for weathering steel with oxide scale suitable for smart lamp poles, which can effectively improve the adhesion and weatherability of the surface coating obtained by coating with iron oxide scale, ensure the service life of the lamp pole, and the preparation process involved is relatively simple and the process cost is greatly reduced, which is suitable for promotion and application.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A coating process for weathering steel strip oxide scale for smart lamp poles, comprising the following steps:

[0008] 1) preparing a powder coating, taking furan resin powder, terpene resin particles, dinitrobenzoic acid, nickel phosphate, chromium sulfate, Fe(OH)3 and zinc oxide as main raw materials, mixing them evenly to obtain a powder coating;

[0009] 2) The powder electrostatic spraying process is used to spray the obtained powder coating on the surface of the smart lamp pole directly formed by weathering steel, and then heat-curing and heat-insulating are performed to obtain the coated parts.

[0010] In the above scheme, the raw materials and their mass percentages in the powder coating include: 20-35% furan resin powder, 10-15% terpene resin particles, 5-10% dinitrobenzoic acid, 5-15% nickel phosphate, 5-10% chromium sulfate, 35-20% Fe(OH), and 10-30% zinc oxide.

[0011] In the above scheme, the furan resin powder is preferably furfuryl alcohol type furan resin; the terpene resin particles are preferably β-pinene polyterpene resin.

[0012] Furthermore, the mixing step in step 1) includes: first grinding the weighed nickel phosphate, chromium sulfate, Fe(OH)3, and zinc oxide, and sieving (through a 200-mesh sieve) to obtain a mixed powder; then mixing the weighed furan resin powder, terpene resin particles, dinitrobenzoic acid powder and the obtained mixed powder evenly to obtain a powder coating.

[0013] In the above scheme, the main chemical components of the hot-rolled weathering steel are calculated by mass percentage as follows: C 0.02-0.1%, Si 0.02-0.3%, Mn 0.5-1.5%, P<0.2%, S<0.01%, Cu 0.02-1.5%, Ni 0.05-1%, Cr 0.2-4%, and the rest are Fe and unavoidable impurities.

[0014] In the above solution, the smart lamp pole is heated to 45-50℃ before spraying.

[0015] In the above scheme, the parameters of the electrostatic spraying process settings include: atomization pressure of 0.5-3.0Mpa, electrostatic current of 10-15uA, and the distance between the muzzle and the workpiece of 100-300mm.

[0016] In the above scheme, the film thickness of the powder coating on the surface of weathering steel is 150-200 μm.

[0017] In the above scheme, the temperature used in the heating and curing step of step 2) is 60-155° C. and the time is 10-15 minutes.

[0018] In the above scheme, the temperature used in the insulation step of step 2) is 40-50° C. and the time is 10-20 minutes.

[0019] The principles of the present invention include:

[0020] 1) Powder coating;

[0021] The present invention adopts a powder coating system based on dual resins. The introduced furan resin is a thermosetting resin that can be cross-linked and cured when heated. The molecular chain segments of the cured product are basically methyl groups (-CH2-) and saturated C-C bonds, and there are no active functional groups, so it does not participate in the chemical reaction of corrosive media. The terpene resin has strong adhesion, heat resistance, radiation protection, acid and alkali resistance, aging resistance and excellent dielectric properties, and has good compatibility and compatibility with the furan resin.

[0022] The present invention further uses nickel phosphate and chromium sulfate in combination with powder electrostatic spraying and heating curing process. The nickel phosphate and chromium sulfate can start to react when heated to a molten state without introducing a solvent, and can achieve a better powder coating construction effect; in addition, during the heating reaction, the Cr element in the chromium sulfate can be promoted to be converted into an amorphous hydroxide oxide α-(Fe 1-x Cr x)OOH, reacts with Fe2O3 to accelerate the formation of α-FeOOH, making the rust layer complete, dense, and highly adherent, with good protective properties, preventing the corrosive medium from further corroding the inside of the steel plate. Dinitrobenzoic acid, as an acidic curing agent for furan resin, can improve its resin properties. It can also be used as a rust remover to improve the surface quality of iron oxide scale, eliminate the need for preliminary surface treatment, and promote the stability of the surface rust layer. The distance between Fe(OH)3 molecules in the molten state is shortened, and the movement is accelerated, which significantly increases its reaction rate with other substances and reduces the reaction time. At the same time, as an inorganic anti-rust coloring pigment, it can react with nickel phosphate to promote the formation of insoluble iron phosphates, further improving corrosion resistance. In addition, the precipitation film formed by chromium sulfate can effectively make up for the defects of the iron phosphate film layer, promote the formation of a complete and dense protective film layer, and significantly improve the corrosion resistance and stability of the resulting rust layer structure. The introduced zinc oxide can react with the carboxyl groups in the resin to improve the flexibility and hardness of the coating, making the coating cleaner, while promoting the curing reaction, accelerating the curing process, and shortening the curing time; in addition, the chemical stability and thermal stability of zinc oxide can further enhance the performance of furan resin in high temperature and corrosive environments, improve the acid and alkali resistance and thermal stability of furan resin, thereby extending the service life of the material.

[0023] 2) Spraying and curing process;

[0024] The present invention adopts powder electrostatic spraying and heating curing technology. Before spraying, the smart lamp pole workpiece is first preheated, and then the powder is sprayed onto the preheated workpiece surface. This can effectively reduce the inherent resistance value of the formed film, reduce and inhibit the back ionization phenomenon, and obtain a uniform, dense, and smooth coating with appropriate thickness.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) The coating technology of the present invention does not require pretreatment of the surface of the weathering steel for lamp poles to remove the oxide scale. The coating process involved is simple and can be done in one coating process, thus avoiding the high cost of traditional pretreatment steps and effectively improving the progress of engineering applications.

[0027] 2) The coating technology of the present invention has good quick-drying characteristics and good adhesion to the steel plate substrate. After coating, it reacts with the surface of weathering steel to promote the rapid formation of a stable rust layer on the surface of the coating, and has long-lasting and excellent metal protection performance.

[0028] 3) The formed smart lamp pole is electrostatically sprayed (thermoplastic resin powder) and baked for curing. The original adhesion between the formed coating and the surface of the oxide layer is level 0. After 1000 hours of accelerated corrosion in neutral salt spray, no rust spots, cracks, bubbling, peeling, etc. appear on the coating surface.

[0029] 4) The coating process of the present invention can effectively eliminate the sandblasting / shot peening operation on the oxide layer, reduce the process cost, and the chemical reagents used are all non-toxic or low-toxic compounds, which has significant economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The cross-hatch test results of the coating film obtained in Example 1;

[0031] Figure 2 The salt spray test results of the coating film obtained in Example 1 are as follows;

[0032] Figure 3 The cross-hatch test (left) and salt spray test (right) results of the coating film obtained in Comparative Example 1 are shown;

[0033] Figure 4 The cross-hatch test (left) and salt spray test (right) results of the coating film obtained in Comparative Example 2 are shown;

[0034] Figure 5 The cross-hatch test (left picture) and salt spray test (right picture) results of the coating film obtained in Comparative Example 3. DETAILED DESCRIPTION

[0035] In order to better explain the present invention, the following is a detailed description of the technology and method of using the oxide coating of weathering steel strips for smart lamp poles in combination with specific embodiments:

[0036] In the following embodiments, the weathering steel (hot-rolled weathering steel) used has the following main chemical components in percentage by mass: C 0.02-0.1%, Si 0.02-0.3%, Mn 0.5-1.5%, P<0.2%, S<0.01%, Cu 0.02-1.5%, Ni 0.05-1%, Cr 0.2-4%, and the rest is Fe and unavoidable impurities.

[0037] In the following examples, the furan resin used is furan resin 25212-86-6 provided by Wuhan Lvjing Fenghua Biotechnology Co., Ltd., in the form of white powder; the terpene resin is β-pinene polyterpene resin provided by DRT, France, in the form of granules.

[0038] Example 1

[0039] A coating process for weathering steel strip oxide scale for smart lamp poles, comprising the following steps:

[0040] 1) preparing a powder coating, wherein the raw materials and their mass percentages are: 15% nickel phosphate, 10% chromium sulfate, 35% Fe(OH), 10% zinc oxide, 35% furan resin powder, 15% terpene resin particles, and 10% dinitrobenzoic acid powder; the weighed nickel phosphate, chromium sulfate, Fe(OH)3, and zinc oxide are put into a grinder for grinding, and passed through a 200-mesh sieve to obtain a mixed powder; then the weighed furan resin powder, terpene resin particles, dinitrobenzoic acid powder, and the obtained mixed powder are put into a mixer and mixed evenly to obtain a powder coating;

[0041] 2) The smart lamp pole directly formed by weathering steel is heated to 45-50℃, and the surface of the smart lamp pole is sprayed with the obtained powder coating at high pressure, wherein the high-pressure spraying parameters are set as follows: atomization pressure is 2.5±0.1Mpa, electrostatic current is 10-15uA, and the distance between the muzzle and the workpiece is 250±10mm; the sprayed workpiece is pushed into the curing furnace, heated to 150±5℃ for curing for 10-15min, and then cooled to 40-50℃ for insulation for 10-20min to obtain the smart lamp pole with weathering steel oxide coating.

[0042] After testing, the adhesion of the coating film obtained in this embodiment (GB9286 cross-cut method) is level 0, and after 1000 hours of neutral salt spray test (GB / T2423.17-2008), there is no blistering, cracking, peeling, or rust on the board surface, and the single-side corrosion expansion at the scratch is less than 1 mm.

[0043] Example 2

[0044] A coating process for weathering steel strip oxide scale for smart lamp poles, comprising the following steps:

[0045] 1) preparing a powder coating, wherein the raw materials and their mass percentages are: 15% nickel phosphate, 5% chromium sulfate, 20% Fe(OH)3, 20% zinc oxide, 20% furan resin powder, 10% terpene resin particles, and 10% dinitrobenzoic acid powder; weighing nickel phosphate, chromium sulfate, Fe(OH)3, and zinc oxide into a grinder for grinding, and then using a 200-mesh screen to obtain a mixed powder; then weighing furan resin powder, terpene resin particles, dinitrobenzoic acid powder, and the obtained mixed powder into a mixer and mixing them evenly to obtain a powder coating;

[0046] 2) The smart lamp pole directly formed by weathering steel is heated to 45-50℃, and the surface of the smart lamp pole is sprayed with the obtained powder coating at high pressure, wherein the high-pressure spraying parameters are set as follows: atomization pressure is 2.5±0.1Mpa, electrostatic current is 10-15uA, and the distance between the muzzle and the workpiece is 250±10mm; the sprayed workpiece is pushed into the curing furnace, heated to 150±5℃ for curing for 10-15min, and then cooled to 40-50℃ for insulation for 10-20min to obtain the smart lamp pole with weathering steel oxide coating.

[0047] After testing, the adhesion of the coating film obtained in this embodiment (GB9286 cross-cut method) is level 0, and after 1000 hours of neutral salt spray test (GB / T2423.17-2008), there is no blistering, cracking, peeling, or rust on the board surface, and the single-side corrosion expansion at the scratch is less than 1 mm.

[0048] Example 3

[0049] A coating process for weathering steel strip oxide scale for smart lamp poles, comprising the following steps:

[0050] 1) preparing a powder coating, wherein the raw materials and their mass percentages are: 5% nickel phosphate, 10% chromium sulfate, 35% Fe(OH), 30% zinc oxide, 35% furan resin powder, 10% terpene resin particles, and 5% dinitrobenzoic acid powder; weighing nickel phosphate, chromium sulfate, Fe(OH)3, and zinc oxide into a grinder for grinding, and then using a 200-mesh screen to obtain a mixed powder; then weighing furan resin powder, terpene resin particles, dinitrobenzoic acid powder, and the obtained mixed powder into a mixer and mixing them evenly to obtain a powder coating;

[0051] 2) The smart lamp pole directly formed by weathering steel is heated to 45-50℃, and the surface of the smart lamp pole is sprayed with the obtained powder coating at high pressure, wherein the high-pressure spraying parameters are set as follows: atomization pressure is 2.5±0.1Mpa, electrostatic current is 10-15uA, and the distance between the muzzle and the workpiece is 250±10mm; the sprayed workpiece is pushed into the curing furnace, heated to 150±5℃ for curing for 10-15min, and then cooled to 40-50℃ for insulation for 10-20min to obtain the smart lamp pole with weathering steel oxide coating.

[0052] After testing, the adhesion of the coating film obtained in this embodiment (GB9286 cross-cut method) is level 0, and after 1000 hours of neutral salt spray test (GB / T2423.17-2008), there is no blistering, cracking, peeling, or rust on the board surface, and the single-side corrosion expansion at the scratch is less than 1 mm.

[0053] Example 4

[0054] A coating process for weathering steel strip oxide scale for smart lamp poles, comprising the following steps:

[0055] 1) preparing a powder coating, wherein the raw materials and their mass percentages are: 10% nickel phosphate, 10% chromium sulfate, 15% Fe(OH)3, 20% zinc oxide, 25% furan resin powder, 12% terpene resin particles, and 8% dinitrobenzoic acid powder; weighing nickel phosphate, chromium sulfate, Fe(OH)3, and zinc oxide into a grinder for grinding, and then using a 200-mesh screen to obtain a mixed powder; then weighing furan resin powder, terpene resin particles, dinitrobenzoic acid powder, and the obtained mixed powder into a mixer and mixing them evenly to obtain a powder coating;

[0056] 2) The smart lamp pole directly formed by weathering steel is heated to 45-50℃, and the obtained powder coating is used for high-pressure spraying on the surface of the smart lamp pole, wherein the high-pressure spraying parameters are set as follows: atomization pressure is 0.5-3.0Mpa, electrostatic current is 10-15uA, and the distance between the muzzle and the workpiece is 250±10mm; the sprayed workpiece is pushed into the curing furnace, heated to 150±5℃ for curing for 10-15min, and then cooled to 40-50℃ for insulation for 10-20min to obtain the smart lamp pole with weathering steel oxide coating.

[0057] After testing, the adhesion of the coating film obtained in this embodiment (GB9286 cross-cut method) is level 0, and after 1000 hours of neutral salt spray test (GB / T2423.17-2008), there is no blistering, cracking, peeling, or rust on the board surface, and the single-side corrosion expansion at the scratch is less than 1 mm.

[0058] Example 5

[0059] A coating process for weathering steel strip oxide scale for smart lamp poles, comprising the following steps:

[0060] 1) preparing a powder coating, wherein the raw materials and their mass percentages are: 12% nickel phosphate, 8% chromium sulfate, 18% Fe(OH)3, 14% zinc oxide, 30% furan resin powder, 10% terpene resin particles, and 8% dinitrobenzoic acid powder; weighing nickel phosphate, chromium sulfate, Fe(OH)3, and zinc oxide into a grinder for grinding, and then using a 200-mesh screen to obtain a mixed powder; then weighing furan resin powder, terpene resin particles, dinitrobenzoic acid powder, and the obtained mixed powder into a mixer and mixing them evenly to obtain a powder coating;

[0061] 2) The smart lamp pole directly formed by weathering steel is heated to 45-50℃, and the surface of the smart lamp pole is sprayed with the obtained powder coating at high pressure, wherein the high-pressure spraying parameters are set as follows: atomization pressure is 2.5±0.1Mpa, electrostatic current is 10-15uA, and the distance between the muzzle and the workpiece is 250±10mm; the sprayed workpiece is pushed into the curing furnace, heated to 150±5℃ for curing for 10-15min, and then cooled to 40-50℃ for insulation for 10-20min to obtain the smart lamp pole with weathering steel oxide coating.

[0062] After testing, the adhesion of the coating film obtained in this embodiment (GB9286 cross-cut method) is level 0, and after 1000 hours of neutral salt spray test (GB / T2423.17-2008), there is no blistering, cracking, peeling, or rust on the board surface, and the single-side corrosion expansion at the scratch is less than 1 mm.

[0063] Comparative Example 1

[0064] A coating process for weathering steel strip oxide scale for smart lamp poles, comprising the following steps:

[0065] 1) preparing a powder coating, wherein the raw materials and their mass percentages are: 12% nickel phosphate, 8% chromium sulfate, 18% Fe(OH)3, 14% zinc oxide, 40% furan resin powder, and 8% dinitrobenzoic acid powder; weighing nickel phosphate, chromium sulfate, Fe(OH)3, and zinc oxide into a grinder for grinding, and then using a 200-mesh screen to obtain a mixed powder; then weighing furan resin powder, dinitrobenzoic acid powder, and the obtained mixed powder into a mixer and mixing them evenly to obtain a powder coating;

[0066] 2) The smart lamp pole directly formed by weathering steel is heated to 45-50°C, and the surface of the smart lamp pole is sprayed with the obtained powder coating at high pressure, wherein the high-pressure spraying parameters are set as follows: the atomization pressure is 2.5±0.1Mpa, the electrostatic current is 10-15uA, and the distance between the muzzle and the workpiece is 250±10mm; the sprayed workpiece is pushed into the curing furnace, heated to 150±5°C for curing for 10-15min, and then cooled to 40-50°C for insulation for 10-20min to obtain the comparative coating 1.

[0067] After testing, the adhesion of the coating film obtained in this comparative example (GB9286 cross-cut method) is level 1. After 1000 hours of neutral salt spray test (GB / T2423.17-2008), the board surface has obvious blistering and severe rust and flow.

[0068] Comparative Example 2

[0069] A coating process for weathering steel strip oxide scale for smart lamp poles, comprising the following steps:

[0070] Preparation of powder coating, the raw materials and their mass percentages are: 15% nickel phosphate, 5% chromium sulfate, 20% Fe(OH)3, 20% zinc oxide, 30% terpene resin particles, 10% dinitrobenzoic acid powder; weighed nickel phosphate, chromium sulfate, Fe(OH)3, and zinc oxide are put into a grinder for grinding, and then a 200-mesh screen is used to obtain a mixed powder; then the weighed terpene resin particles, dinitrobenzoic acid powder and the obtained mixed powder are put into a mixer and mixed evenly to obtain a powder coating;

[0071] The smart lamp pole directly formed by weathering steel is heated to 45-50℃, and the surface of the smart lamp pole is sprayed with the obtained powder coating at high pressure, wherein the high-pressure spraying parameters are set as follows: atomization pressure is 2.5±0.1Mpa, electrostatic current is 10-15uA, and the distance between the muzzle and the workpiece is 250±10mm; the sprayed workpiece is pushed into the curing furnace, heated to 150±5℃ for curing for 10-15min, and then cooled to 40-50℃ for insulation for 10-20min to obtain comparative coating 2.

[0072] After testing, the adhesion of the coating film obtained in this comparative example (GB9286 cross-cut method) is level 3. After 1000 hours of neutral salt spray test (GB / T2423.17-2008), there are obvious bubbles at the cross-cut of the board surface, and rust and flow are serious.

[0073] The coating film surface obtained in Example 1 was subjected to adhesion and neutral salt spray tests. The results showed that the obtained weathering steel + coating was Figure 1 ), adhesion level 0, good adhesion.

[0074] Figure 2 This is the salt spray test result of the coating film obtained in Example 1. It can be seen from the figure that after 1000 hours of salt spray test, the coating surface of the smart lamp pole after weathering steel strip oxide coating has no blistering, cracking, peeling, rust, and the single-sided corrosion expansion at the scratch is <1mm; it has good corrosion resistance.

[0075] Comparative Example 3

[0076] A coating process for weathering steel strip oxide scale for smart lamp poles, comprising the following steps:

[0077] 1) preparing a powder coating, wherein the raw materials and their mass percentages are: 15% nickel phosphate, 5% chromium sulfate, 20% Fe(OH)3, 20% zinc oxide, 20% furan resin powder, 10% terpene resin particles, and 10% dinitrobenzoic acid powder; weighing nickel phosphate, chromium sulfate, Fe(OH)3, and zinc oxide into a grinder for grinding, and then using a 200-mesh screen to obtain a mixed powder; then weighing furan resin powder, terpene resin particles, dinitrobenzoic acid powder, and the obtained mixed powder into a mixer and mixing them evenly to obtain a powder coating;

[0078] 2) Use the obtained powder coating to perform high-pressure spraying on the surface of the smart lamp pole directly formed by weathering steel, wherein the high-pressure spraying parameters are set as follows: the atomization pressure is 2.5±0.1Mpa, the electrostatic current is 10-15uA, and the distance between the muzzle and the workpiece is 250±10mm; push the sprayed workpiece into the curing furnace, heat it to 150±5℃ for curing for 10-15min, and then cool it to 40-50℃ for insulation for 10-20min to obtain the smart lamp pole with weathering steel oxide coating.

[0079] After testing, the adhesion of the coating film obtained in this comparative example (GB9286 cross-cut method) is level 3. After 1000 hours of neutral salt spray test (GB / T2423.17-2008), the board surface has slight blistering and severe rust and flow.

[0080] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A coating process for weathering steel strip oxide skin for smart lamp poles, characterized in that: The steps include: 1) preparing a powder coating, taking furan resin powder, terpene resin particles, dinitrobenzoic acid, nickel phosphate, chromium sulfate, Fe(OH)3 and zinc oxide as main raw materials, mixing them evenly to obtain a powder coating; 2) The powder electrostatic spraying process is used to spray the obtained powder coating on the surface of the smart lamp pole directly formed by weathering steel, and then heat-curing and heat-insulating are performed to obtain the coated parts.

2. The process for coating the weather-resistant steel strip with oxide skin for smart lamp poles according to claim 1 is characterized in that: The raw materials and their mass percentages in the powder coating include: 20-35% furan resin powder, 10-15% terpene resin particles, 5-10% dinitrobenzoic acid, 5-15% nickel phosphate, 5-10% chromium sulfate, 5-20% Fe(OH)3, and 10-30% zinc oxide.

3. The process for coating the weathering steel strip with oxide skin for smart lamp poles according to claim 1 is characterized in that: The main chemical components of the hot-rolled weathering steel are as follows by mass percentage: C 0.02-0.1%, Si 0.02-0.3%, Mn 0.5-1.5%, P<0.2%, S<0.01%, Cu 0.02-1.5%, Ni 0.05-1%, Cr 0.2-4%, and the rest are Fe and unavoidable impurities.

4. The process for coating the weathering steel strip oxide skin for a smart lamp pole according to claim 1 is characterized in that: The smart light pole is heated to 45-50℃ before spraying.

5. The process for coating the weathering steel strip oxide skin for smart lamp poles according to claim 1 is characterized in that: The parameters of the electrostatic spraying process settings include: atomization pressure of 0.5-3.0Mpa, electrostatic current of 10-15uA, and distance between the muzzle and the workpiece of 100-300mm.

6. The process for coating the weathering steel strip oxide skin for smart lamp poles according to claim 1 is characterized in that: The film thickness of the powder coating on the surface of weathering steel is 150-200 μm.

7. The process for coating the weathering steel strip oxide skin for smart lamp poles according to claim 1 is characterized in that: Step 2) The temperature used in the heating and curing step is 60-155° C. and the time is 10-15 minutes.

8. The process for coating the weathering steel strip oxide skin for smart lamp poles according to claim 1 is characterized in that: Step 2) The temperature used in the insulation step is 40-50°C and the time is 10-20 minutes.

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