A hydraulic support surface treatment process

Abstract

The application provides a hydraulic support surface treatment process and belongs to the technical field of hydraulic support surface treatment, and comprises the following steps: step S1, adding ferrous sulfate heptahydrate, sodium molybdate and dimethylamine borane into a nickel sulfamate solution, then adding an additive, uniformly mixing, adjusting the pH to 4.0-4.5, obtaining a nickel sulfamate plating solution, electroplating a pretreated hydraulic support base material, washing with water, drying, and forming a bottom layer plating layer; step S2, adding ZIF-67 loaded with BTA / lauric acid into a mixed plating solution of nickel sulfate and cobalt sulfate, electroplating the hydraulic support base material with the bottom layer plating layer to form a functional plating layer; step S3, impregnating and sealing the plating layer with a sealing agent, drying, and obtaining the hydraulic support after surface treatment. The application can achieve the purposes of good corrosion resistance and strong wear resistance of the hydraulic support.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic support surface treatment, and particularly relates to a hydraulic support surface treatment process. BACKGROUND

[0002] As the core supporting equipment in coal mining, the reliability of the surface treatment process of the hydraulic support directly affects the service life and safety. The traditional process mainly uses surface painting, but has significant defects, for example, poor adhesion of the paint layer, uneven surface, and low smoothness. In addition, although the early widely used electroplating chromium process is low in cost, it has problems such as hexavalent chromium pollution, hydrogen embrittlement risk, and easy peeling of the plating layer, and especially it is difficult to meet the wear resistance and corrosion resistance requirements in complex geological environments, and it is difficult to adapt to the challenges of modern coal mine high strength and high corrosive working conditions.

[0003] The patent application file with the publication number CN109136813A discloses a mine hydraulic support column surface treatment method, which comprises the following steps: step 1: oil removal, rust removal, and sand blasting roughening; step 2: preparing a metal ceramic coating powder; step 3: using an ultrasonic flame spraying device and the metal ceramic coating powder to spray the metal ceramic coating on the surface of the mine hydraulic support column; step 4: using an organic resin to perform sealing treatment on the surface coating of the hydraulic column after the spraying is completed; and step 5: performing polishing treatment on the surface of the hydraulic column after the sealing treatment. Although this scheme removes iron and cobalt in the coating to reduce the factors affecting corrosion resistance, it still uses a large amount of chromium, which is easy to pollute and has a small degree of improvement in the base material corrosion resistance and wear resistance, and it is difficult to meet the wear resistance and corrosion resistance requirements.

[0004] Therefore, it is necessary to provide a hydraulic support surface treatment process to solve the problems existing in the prior art. SUMMARY

[0005] Therefore, the present application provides a hydraulic support surface treatment process, which can achieve the purposes of good corrosion resistance and strong wear resistance of the hydraulic support.

[0006] The specific scheme of the present application is as follows: a hydraulic support surface treatment process comprises the following steps:

[0007] Step S1: adding ferrous sulfate heptahydrate, sodium molybdate, and dimethylamine borane into a nickel sulfamate solution, then adding an additive, mixing uniformly, adjusting the pH to 4.0-4.5, obtaining a nickel sulfamate plating solution, electroplating a pretreated hydraulic support base material, washing with water, and drying to form a bottom layer plating layer;

[0008] Step S2: adding ZIF-67 loaded with BTA / lauric acid into a mixed plating solution of nickel sulfate and cobalt sulfate, electroplating the hydraulic support base material forming the bottom layer plating layer to form a functional plating layer.

[0009] Step S3, the coating is immersed in the pore sealing agent for sealing, and is dried to obtain the hydraulic support after surface treatment.

[0010] The nickel sulfamate plating solution has high stability and fast deposition rate, and the obtained nickel coating has low internal stress and good ductility, and is suitable for thick plating. The ferrous sulfate heptahydrate can provide Fe to form a solid solution with Ni, balance the hardness and ductility of the coating, improve the toughness of the coating, and avoid the decrease of wear resistance caused by the over brittleness of the nickel coating. The sodium molybdate can provide Mo, and can form a molybdenum trioxide passivation film in a corrosive environment to inhibit the penetration of corrosive ions and significantly improve the corrosion resistance. The dimethylamine borane as a boron source can stably release boron under acidic conditions and provide a reducing environment to inhibit the oxidation of metal ions. The multi-element alloy coating formed by the co-deposition of Fe, Mo, B and Ni can significantly enhance the hardness and wear resistance of the hydraulic support.

[0011] The ZIF-67 loaded with BTA (benzotriazole) / lauric acid is added to a mixed plating solution of nickel sulfate and cobalt sulfate to form a coating by electroplating co-deposition. When the coating is damaged, the environment becomes acidic due to the decrease of pH, and the ZIF-67 gradually releases BTA and lauric acid. BTA is a high-efficiency corrosion inhibitor for metals such as copper and iron. The nitrogen atoms in the molecule of BTA combine with the active sites on the surface of the metal (such as copper) to form a dense complex protective film, which physically isolates and blocks the direct contact of water, oxygen and other corrosive media with the metal, thereby improving the corrosion resistance. Lauric acid has hydrophobicity, and the hydrophobic groups at the ends of the molecular chain can reduce the surface energy of the material, form a hydrophobic barrier, and block the penetration of water, thereby delaying the corrosion of the metal. The nickel and cobalt coatings can provide corrosion resistance and wear resistance, and enhance the hardness of the coating.

[0012] Preferably, in the step S1, the additives include nickel chloride, boric acid, sodium citrate, sodium saccharin and sodium dodecyl sulfate.

[0013] Preferably, in the step S1, the preparation of the pretreated hydraulic support substrate includes the following steps: sandblasting the hydraulic support substrate with 80-100 mesh white corundum sand to roughen the surface, the sandblasting pressure is 0.6-0.8 MPa, the surface roughness Ra is ≥6.3 μm, the oil is removed and cleaned, and the pretreated hydraulic support substrate is obtained after preheating.

[0014] The white corundum sand has high hardness, can effectively remove the oxide layer and contaminants on the surface of the substrate, and form a rough surface. The rough surface can significantly improve the bonding strength of the coating and the hydraulic support substrate by increasing the contact area and mechanical interlocking force of the coating and the substrate. By removing residual grease, it can avoid the formation of pores or shedding of the coating due to contaminants. Preheating can remove surface adsorbed water, reduce the temperature difference stress between the plating solution and the substrate during electroplating, and improve the wettability of the plating solution.

[0015] Preferably, in the step S1, the current for electroplating is 3.5-4.5 A / dm 2 , and the temperature is 55-62℃.

[0016] Preferably, in the step S2, the preparation of the ZIF-67 loaded with BTA / lauric acid comprises the following steps:

[0017] Dissolve 2-methylimidazole in deionized water, adjust the pH to 10.5-11, stir until completely dissolved to obtain solution A; dissolve cobalt chloride hexahydrate in deionized water, stir until completely dissolved to obtain solution B; dissolve BTA and lauric acid together in methanol, ultrasonic treatment to obtain solution C; slowly add solution B to solution A, while adding solution C, stir the reaction, centrifuge, wash, dry to obtain ZIF-67 loaded with BTA / lauric acid.

[0018] The pore structure of ZIF-67 can delay the release rate of BTA and lauric acid, and only trigger release when corrosion occurs, achieving long-acting protection of the plating layer on the hydraulic support substrate.

[0019] Preferably, the stirring speed of the reaction is 250-400 rpm, and the time is 10-14 h.

[0020] Preferably, in the step S2, the ratio of nickel sulfate to cobalt sulfate in the mixed plating solution is 6:1.

[0021] Preferably, in the step S3, the pore sealing agent is obtained by mixing and stirring acrylic resin, nano chromium oxide, anhydrous ethanol and butyl acetate in a ratio of 60:15:20:5.

[0022] The acrylic resin in the pore sealing agent has strong adhesion and good weather resistance, and can also enhance the toughness of the plating layer; the nano chromium oxide has high hardness, as a reinforcing phase, can improve the hardness of the plating layer, and can also significantly improve the wear resistance of the hydraulic support substrate; ethanol and butyl acetate are mixed solvents, which can adjust the viscosity for easy impregnation of the hydraulic support substrate and improve the sealing degree.

[0023] Preferably, the mixing and stirring speed is 350-500 r / min, and the time is 5-7 h.

[0024] Preferably, in the step S3, after drying, the hydraulic support is subjected to vapor deposition of tridecafluorooctyltriethoxysilane.

[0025] Tridecafluorooctyltriethoxysilane forms a monolayer on the surface of the plating layer through vapor deposition, which has low surface energy and gives the substrate surface superhydrophobicity, significantly improving the corrosion resistance and self-cleaning performance.

[0026] The above technical scheme of the present application at least has the following beneficial effects:

[0027] (1) The nickel sulfamate plating solution has high stability, and the obtained nickel plating layer has low internal stress and good ductility. The ferrous sulfate heptahydrate, sodium molybdate, and dimethylamine borane can provide Fe, Mo, and B, and co-deposited with Ni to form a multi-element alloy plating layer, which can significantly enhance the hardness and wear resistance of the hydraulic support.

[0028] (2) When the plating layer is damaged, the pH changes, and the ZIF-67 loaded BTA (benzotriazole) / lauric acid can gradually release BTA and lauric acid. The nitrogen atoms in BTA combine with the active sites on the metal surface to form a dense complex protective film, which blocks the direct contact of corrosion media such as water and oxygen with the metal, thereby improving corrosion resistance. The hydrophobic groups at the end of the lauric acid molecule chain can reduce the surface energy of the material, forming a hydrophobic barrier to block water penetration and delay corrosion.

[0029] (3) The pore structure of ZIF-67 can delay the release rate of BTA and lauric acid, and only trigger release when corrosion occurs, achieving long-acting protection of the plating layer on the hydraulic support substrate. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the embodiments of the present application. The described embodiments are part of the embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present application belong to the scope of protection of the present application.

[0031] Embodiment 1

[0032] The hydraulic support substrate was pretreated by sandblasting and roughening with 80 mesh white corundum sand at a sandblasting pressure of 0.7 MPa, and the surface roughness Ra was ≥6.3 μm (to enhance the subsequent plating layer adhesion), and the oil was removed and preheated to obtain a pretreated hydraulic support substrate.

[0033] 15 g of ferrous sulfate heptahydrate, 12 g of sodium molybdate, and 6 g of dimethylamine borane were added to 1500 mL of a 30 wt% concentration nickel sulfamate solution, and then 20 g of nickel chloride, 50 g of boric acid, 30 g of sodium citrate, 1.5 g of sodium saccharin, and 0.3 g of sodium dodecyl sulfate were added and mixed uniformly to obtain a nickel sulfamate plating solution. The pretreated hydraulic support substrate was electroplated at an electroplating current of 4 A / dm 2 , a temperature of 60°C, and a plating layer thickness of 20-30 μm to form a bottom layer plating layer.

[0034] 50g 2-methylimidazole was dissolved in 1000mL deionized water, the pH was adjusted to 10.5-11, and stirring was performed until complete dissolution to obtain solution A; 40g of cobalt chloride hexahydrate was dissolved in 500mL deionized water, and stirring was performed until complete dissolution to obtain solution B; 7.5g of BTA (benzotriazole) and 4g of lauric acid were dissolved in 250mL of methanol, and ultrasonic treatment was performed to obtain solution C; solution B was slowly added to solution A, and solution C was added at the same time, the stirring speed was maintained at 300rpm, and the reaction was performed at room temperature for 12 hours. After the reaction was completed, centrifugation was performed, and washing was performed three times with methanol to remove un-encapsulated BTA and lauric acid, and vacuum drying was performed at 60°C for 12 hours to obtain BTA / lauric acid-loaded ZIF-67. 45g of the BTA / lauric acid-loaded ZIF-67 was added to a mixed plating solution of nickel sulfate and cobalt sulfate, and the hydraulic support substrate on which the base layer was formed was electroplated to form a functional plating layer.

[0035] 60g of an acrylic resin, 15g of nano-chromium oxide, 20g of anhydrous ethanol, and 5g of butyl acetate were mixed, stirring was performed at a speed of 400r / min for 6h, the hydraulic support substrate on which the functional plating layer was formed was immersed, dried, and then vapor deposition was performed using tridecafluorooctyltriethoxysilane, and drying was performed to complete the hydraulic support surface treatment process, and the surface-treated hydraulic support was obtained.

[0036] Example 2

[0037] The hydraulic support substrate was pretreated, 80 mesh white corundum sand was used for sandblasting and roughening, the sandblasting pressure was 0.6MPa, the surface roughness Ra was ≥6.3μm (to enhance the subsequent plating layer adhesion), oil removal and preheating were performed, and the pretreated hydraulic support substrate was obtained.

[0038] 10g of ferrous sulfate heptahydrate, 8g of sodium molybdate, and 5g of dimethylamine borane were added to 1000mL of a 25wt% concentration nickel sulfamate solution, 15g of nickel chloride, 40g of boric acid, 20g of sodium citrate, 1g of sodium saccharin, and 0.1g of sodium dodecyl sulfate were added, and mixing was performed to obtain a nickel sulfamate plating solution. The pretreated hydraulic support substrate was electroplated, the electroplating current was 4.5A / dm 2 , the temperature was 55°C, the plating layer thickness was 20-30μm, and the base layer was formed.

[0039] 50g 2-methylimidazole was dissolved in 1000mL deionized water, the pH was adjusted to 10.5-11, and stirring was performed until complete dissolution to obtain solution A; 40g of cobalt chloride hexahydrate was dissolved in 500mL deionized water, and stirring was performed until complete dissolution to obtain solution B; 7.5g of BTA (benzotriazole) and 4g of lauric acid were dissolved in 250mL methanol, and ultrasonic treatment was performed to obtain solution C; solution B was slowly added to solution A, and solution C was added at the same time, the stirring speed was maintained at 250rpm, and reaction was performed at room temperature for 14h. After the reaction was completed, centrifugation was performed, and washing was performed three times with methanol to remove un-encapsulated BTA and lauric acid, and vacuum drying was performed at 60℃ for 12h to obtain BTA / lauric acid-loaded ZIF-67. 40g of the BTA / lauric acid-loaded ZIF-67 was added to a mixed plating solution of nickel sulfate and cobalt sulfate, and electroplating was performed on the hydraulic support substrate on which the base layer plating layer was formed, thereby forming a functional plating layer.

[0040] 60g of an acrylic resin, 15g of nano-chromium oxide, 20g of anhydrous ethanol, and 5g of butyl acetate were mixed, stirring was performed at a speed of 350r / min for 7h, the hydraulic support substrate on which the functional plating layer was formed was immersed, and drying was performed. Then, vapor deposition was performed using tridecafluorooctyltriethoxysilane, drying was performed, and the hydraulic support surface treatment process was completed, thereby obtaining the surface-treated hydraulic support.

[0041] Example 3

[0042] The hydraulic support substrate was pretreated, 80 mesh white corundum sand was used for sandblasting and roughening, the sandblasting pressure was 0.8MPa, the surface roughness Ra was ≥6.3μm (to enhance the subsequent plating layer adhesion), oil removal and preheating were performed, and a pretreated hydraulic support substrate was obtained.

[0043] 12g of ferrous sulfate heptahydrate, 10g of sodium molybdate, and 5.5g of dimethylamine borane were added to 1300mL of a nickel sulfamate solution with a concentration of 25wt%, 18g of nickel chloride, 45g of boric acid, 25g of sodium citrate, 1.2g of sodium saccharin, and 0.2g of sodium dodecyl sulfate were further added, and mixing was performed until uniform, thereby obtaining a nickel sulfamate plating solution. The pretreated hydraulic support substrate was electroplated, the electroplating current was 3.5A / dm 2 , the temperature was 62℃, the plating layer thickness was 20-30μm, and a base layer plating layer was formed.

[0044] 50g 2-methylimidazole was dissolved in 1000mL deionized water, the pH was adjusted to 10.5-11, and stirring was performed until complete dissolution to obtain solution A; 40g of cobalt chloride hexahydrate was dissolved in 500mL deionized water, and stirring was performed until complete dissolution to obtain solution B; 7.5g of BTA (benzotriazole) and 4g of lauric acid were dissolved in 250mL of methanol, and ultrasonic treatment was performed to obtain solution C; solution B was slowly added to solution A, and solution C was added at the same time, the stirring speed was maintained at 400rpm, and the reaction was performed at room temperature for 10 hours. After the reaction was completed, centrifugation was performed, and washing was performed three times with methanol to remove un-encapsulated BTA and lauric acid, and vacuum drying was performed at 60°C for 12 hours to obtain BTA / lauric acid-loaded ZIF-67. 50g of the BTA / lauric acid-loaded ZIF-67 was added to a mixed plating solution of nickel sulfate and cobalt sulfate, and the hydraulic support substrate on which the base layer was formed was electroplated to form a functional plating layer.

[0045] 60g of acrylic resin, 15g of nano-chromium oxide, 20g of anhydrous ethanol, and 5g of butyl acetate were mixed, stirring was performed at a speed of 500r / min for 5.5h, the hydraulic support substrate on which the functional plating layer was formed was immersed, dried, and then vapor deposition was performed using tridecafluorooctyltriethoxysilane, and drying was performed to complete the hydraulic support surface treatment process, and the surface-treated hydraulic support was obtained.

[0046] Example 4

[0047] The hydraulic support substrate was pretreated, 80 mesh white corundum sand was used for sandblasting and roughening, the sandblasting pressure was 0.6MPa, the surface roughness Ra was ≥6.3μm (to enhance the subsequent plating layer adhesion), oil removal and preheating were performed, and the pretreated hydraulic support substrate was obtained.

[0048] 10g of ferrous sulfate heptahydrate, 8g of sodium molybdate, and 5g of dimethylamine borane were added to 1000mL of a 30wt% concentration nickel sulfamate solution, 20g of nickel chloride, 50g of boric acid, 25g of sodium citrate, 1.5g of sodium saccharin, and 0.3g of sodium dodecyl sulfate were further added, and mixing was performed to obtain a nickel sulfamate plating solution. The pretreated hydraulic support substrate was electroplated, the electroplating current was 4.5A / dm 2 , the temperature was 60°C, the plating layer thickness was 20-30μm, and the base layer was formed.

[0049] 50g 2-methylimidazole was dissolved in 1000mL deionized water, the pH was adjusted to 10.5-11, and stirring was performed until complete dissolution to obtain solution A; 40g of cobalt chloride hexahydrate was dissolved in 500mL deionized water, and stirring was performed until complete dissolution to obtain solution B; 7.5g of BTA (benzotriazole) and 4g of lauric acid were dissolved in 250mL methanol, and ultrasonic treatment was performed to obtain solution C; solution B was slowly added to solution A, and solution C was added at the same time, the stirring speed was maintained at 350rpm, and reaction was performed at room temperature for 11 hours. After the reaction was completed, centrifugation was performed, and washing was performed three times with methanol to remove un-encapsulated BTA and lauric acid, and vacuum drying was performed at 60°C for 12 hours to obtain BTA / lauric acid-loaded ZIF-67, 45g of the BTA / lauric acid-loaded ZIF-67 was added to a mixed plating solution of nickel sulfate and cobalt sulfate, and electroplating was performed on the hydraulic support substrate on which the base layer plating layer was formed to form a functional plating layer.

[0050] 60g of acrylic resin, 15g of nano-chromium oxide, 20g of anhydrous ethanol, and 5g of butyl acetate were mixed, stirring was performed at a speed of 450r / min for 5h, the hydraulic support substrate on which the functional plating layer was formed was immersed, dried, and then vapor deposition was performed using tridecafluorooctyltriethoxysilane, and drying was performed to complete the hydraulic support surface treatment process, and the surface-treated hydraulic support was obtained.

[0051] Example 5

[0052] The hydraulic support substrate was pretreated, 80 mesh white corundum sand was used for sandblasting and roughening, the sandblasting pressure was 0.7MPa, the surface roughness Ra was ≥6.3μm (to enhance the subsequent plating layer adhesion), oil removal and preheating were performed, and the pretreated hydraulic support substrate was obtained.

[0053] 15g of ferrous sulfate heptahydrate, 10g of sodium molybdate, and 6g of dimethylamine borane were added to 1500mL of a nickel sulfamate solution with a concentration of 25wt%, 15g of nickel chloride, 50g of boric acid, 20g of sodium citrate, 1g of sodium saccharin, and 0.1g of sodium dodecyl sulfate were further added, and mixing was performed to obtain a nickel sulfamate plating solution, and the pretreated hydraulic support substrate was electroplated, the electroplating current was 4.5A / dm 2 , the temperature was 58°C, the plating layer thickness was 20-30μm, and a base layer plating layer was formed.

[0054] 50g 2-methylimidazole was dissolved in 1000mL deionized water, the pH was adjusted to 10.5-11, and stirring was performed until complete dissolution to obtain solution A; 40g of cobalt chloride hexahydrate was dissolved in 500mL deionized water, and stirring was performed until complete dissolution to obtain solution B; 7.5g of BTA (benzotriazole) and 4g of lauric acid were dissolved in 250mL methanol, and ultrasonic treatment was performed to obtain solution C; solution B was slowly added to solution A, and solution C was added at the same time, the stirring speed was maintained at 300rpm, and reaction was performed at room temperature for 13h. After the reaction was completed, centrifugation was performed, and washing was performed three times with methanol to remove un-encapsulated BTA and lauric acid, and vacuum drying was performed at 60℃ for 12h to obtain BTA / lauric acid-loaded ZIF-67. 40g of the BTA / lauric acid-loaded ZIF-67 was added to a mixed plating solution of nickel sulfate and cobalt sulfate, and electroplating was performed on the hydraulic support substrate on which the base layer plating layer was formed, thereby forming a functional plating layer.

[0055] 60g of an acrylic resin, 15g of nano-chromium oxide, 20g of anhydrous ethanol, and 5g of butyl acetate were mixed, stirring was performed at a speed of 350r / min for 7h, the hydraulic support substrate on which the functional plating layer was formed was immersed, and drying was performed. Then, vapor deposition was performed using tridecafluorooctyltriethoxysilane, drying was performed, and the hydraulic support surface treatment process was completed, thereby obtaining the surface-treated hydraulic support.

[0056] Example 6

[0057] The hydraulic support substrate was pretreated, 80 mesh white corundum sand was used for sandblasting and roughening, the sandblasting pressure was 0.6MPa, the surface roughness Ra was ≥6.3μm (to enhance the subsequent plating layer adhesion), oil removal and preheating were performed, and a pretreated hydraulic support substrate was obtained.

[0058] 10g of ferrous sulfate heptahydrate, 12g of sodium molybdate, and 5g of dimethylamine borane were added to 1200mL of a 25wt% concentration nickel sulfamate solution, 15g of nickel chloride, 40g of boric acid, 20g of sodium citrate, 1g of sodium saccharin, and 0.2g of sodium dodecyl sulfate were further added, and mixing was performed until uniform, thereby obtaining a nickel sulfamate plating solution. The pretreated hydraulic support substrate was electroplated, the electroplating current was 3.5A / dm 2 , the temperature was 62℃, the plating layer thickness was 20-30μm, and a base layer plating layer was formed.

[0059] 50g 2-methylimidazole is dissolved in 1000mL deionized water, the pH is adjusted to 10.5-11, and stirring is carried out until complete dissolution to obtain solution A; 40g of cobalt chloride hexahydrate is dissolved in 500mL deionized water, and stirring is carried out until complete dissolution to obtain solution B; 7.5g of BTA (benzotriazole) and 4g of lauric acid are dissolved in 250mL of methanol, and ultrasonic treatment is carried out to obtain solution C; solution B is slowly added to solution A, and solution C is added at the same time, the stirring speed is kept at 350rpm, and reaction is carried out at room temperature for 10 hours. After the reaction is completed, centrifugation is carried out, and washing is carried out with methanol 3 times to remove unencapsulated BTA and lauric acid, and vacuum drying is carried out at 60°C for 12 hours to obtain ZIF-67 loaded with BTA / lauric acid, 50g of ZIF-67 loaded with BTA / lauric acid is added to a mixed plating solution of nickel sulfate and cobalt sulfate, and electroplating is carried out on the hydraulic support base material forming a bottom layer of plating layer to form a functional plating layer.

[0060] 60g of acrylic resin, 15g of nano-chromium oxide, 20g of anhydrous ethanol and 5g of butyl acetate are mixed, stirring is carried out at a speed of 400r / min for 5.5h, the hydraulic support base material forming a functional plating layer is immersed, dried, and then steam deposition is carried out using tridecafluorooctyltriethoxysilane, and drying is carried out to complete the hydraulic support surface treatment process to obtain the surface-treated hydraulic support.

[0061] The present application also carries out comparative examples and related tests.

[0062] Comparative Example 1

[0063] The difference between Comparative Example 1 and Example 1 is only that in Comparative Example 1, only a nickel sulfamate solution and an additive are used for electroplating to form a bottom layer of plating layer, and the other components and preparation methods are the same as those of Example 1 to obtain the surface-treated hydraulic support.

[0064] Comparative Example 2

[0065] The difference between Comparative Example 2 and Example 1 is only that in Comparative Example 2, ZIF-67 is not loaded with BTA / lauric acid, and only ZIF-67 is used, and the other components and preparation methods are the same as those of Example 1 to obtain the surface-treated hydraulic support.

[0066] Comparative Example 3

[0067] The difference between Comparative Example 3 and Example 1 is only that in Comparative Example 3, no sealing agent is used for immersion sealing, and the other components and preparation methods are the same as those of Example 1 to obtain the surface-treated hydraulic support.

[0068] Performance detection test

[0069] The hydraulic support after the surface treatment process of embodiments 1-6 and comparative examples 1-3 was tested for corrosion resistance and wear resistance in a simulated mine environment, the corrosion resistance was tested by the time of corrosion phenomenon in salt spray test; the wear resistance was tested by mass loss; the hardness test was measured by a microhardness tester, and the test results are shown in Table 1.

[0070] Table 1

[0071]

[0072] From the above Table 1, it can be seen that, compared with embodiment 1, the hardness and wear resistance of the hydraulic support after surface treatment of comparative example 1 decreased more obviously, which indicated that the bottom layer coating formed by co-deposition of Fe, Mo, B and Ni could effectively improve the wear resistance and hardness of the hydraulic support; compared with embodiment 1, the corrosion resistance of the hydraulic support after surface treatment prepared in comparative example 2 decreased greatly, which could indicate that ZIF-67 loaded with BTA / lauric acid could greatly improve the corrosion resistance of the hydraulic support; the performance of the hydraulic support after surface treatment prepared in comparative example 3 decreased, which indicated that the preparation of the sealing agent could make the hydraulic support more suitable for a more harsh environment.

[0073] The above is the preferred embodiment of the present application, and those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the protection scope of the present application.

Claims

1. A surface treatment process for a hydraulic support, characterized in that, Includes the following steps: Step S1: Add ferrous sulfate heptahydrate, sodium molybdate and dimethylamine borane to nickel aminosulfonate solution, add additives, mix evenly, adjust pH to 4.0-4.5 to obtain nickel aminosulfonate plating solution, electroplate the pretreated hydraulic support substrate, wash with water, dry to form the bottom layer. Step S2: Add ZIF-67 loaded with BTA and lauric acid to a mixed plating solution of nickel sulfate and cobalt sulfate, and electroplate the hydraulic support substrate to form the bottom layer to form a functional coating. Step S3: The coating is impregnated and sealed with a sealing agent, dried, and then vapor-deposited with tridecafluorooctyltriethoxysilane to obtain the surface-treated hydraulic support. The additives include nickel chloride, boric acid, sodium citrate, sodium saccharin, and sodium dodecyl sulfate; In step S3, the sealing agent is obtained by mixing acrylic resin, nano chromium oxide, anhydrous ethanol and butyl acetate in a ratio of 60:15:20:

5.

2. The surface treatment process for a hydraulic support according to claim 1, characterized in that, In step S1, the preparation of the pretreated hydraulic support substrate includes the following steps: taking 80-100 mesh white corundum sand to sandblast roughen the hydraulic support substrate, the sandblasting pressure is 0.6-0.8MPa, the surface roughness Ra≥6.3μm, degreasing and cleaning and preheating to obtain the pretreated hydraulic support substrate.

3. The surface treatment process for a hydraulic support according to claim 1, characterized in that, In step S1, the electroplating current is 3.5-4.5 A / dm. 2 The temperature is 55-62℃.

4. The surface treatment process for a hydraulic support according to claim 1, characterized in that, In step S2, the preparation of ZIF-67 loaded with BTA and lauric acid includes the following steps: Dissolve 2-methylimidazole in deionized water, adjust the pH to 10.5-11, and stir until completely dissolved to obtain solution A; dissolve cobalt chloride hexahydrate in deionized water and stir until completely dissolved to obtain solution B; dissolve BTA and lauric acid together in methanol. The mixture was ultrasonically treated to obtain solution C. Solution B was slowly added dropwise to solution A, and solution C was added simultaneously. The mixture was stirred, centrifuged, washed, and dried to obtain ZIF-67 loaded with BTA and lauric acid.

5. The surface treatment process for a hydraulic support according to claim 4, characterized in that, The stirring reaction is carried out at a speed of 250-400 rpm for 10-14 hours.

6. The surface treatment process for a hydraulic support according to claim 1, characterized in that, In the preparation of the sealing agent, the mixing speed is 350-500 r / min and the time is 5-7 h.

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