Wear-resistant coating-containing anchoring part for high-speed rail and preparation method of wear-resistant coating-containing anchoring part

Abstract

The invention discloses a wear-resistant coating-containing anchoring part for a high-speed rail and a preparation method of the wear-resistant coating-containing anchoring part, and relates to the technical field of wear-resistant anchoring parts. The method specifically comprises the following steps that S1, the anchoring part is subjected to oil removal, water washing, acid pickling, water washing and drying, and a pretreated anchoring part is obtained; s2, the pretreated anchoring part is put into electroplating liquid A, and primary electroplating is conducted; transferring to an electroplating solution B, and carrying out secondary electroplating to obtain an anchoring part A; and S3, organic paint is sprayed on the outer surface of the anchoring part A, heating and curing are conducted, and the anchoring part containing the wear-resistant coating is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of wear-resistant anchor pieces, and in particular to an anchor piece for high-speed railways containing a wear-resistant coating and a preparation method thereof. Background Art

[0002] In high-speed rail systems, anchors are key components to ensure the stability and safety of track structures. They not only bear the huge weight and dynamic loads of the train, but are also exposed to various complex environments for a long time, such as extreme weather, industrial pollution, and salt spray corrosion. These environmental factors often lead to reduced wear resistance and corrosion resistance of anchors, thus affecting their service life and performance.

[0003] Although traditional anchor materials have certain wear resistance and corrosion resistance, they often cannot meet the high safety and stability requirements of high-speed rail systems during long-term service. Therefore, developing an anchor for high-speed rail with excellent wear resistance and corrosion resistance and its preparation method is important for improving the overall performance of the high-speed rail system and extending the service life of the anchor.

[0004] In the prior art, Ni-WP alloy coating is a common wear-resistant and corrosion-resistant coating. However, during the electroplating process, pure alloy coating may have problems such as tiny cracks, resulting in decreased corrosion resistance. At the same time, with the development of industry, higher requirements are placed on the wear and corrosion resistance of the coating.

[0005] In summary, in order to solve the above problems, it is of great significance to prepare an anchor for high-speed railways containing a wear-resistant coating. Summary of the invention

[0006] The object of the present invention is to provide an anchor for high-speed railway containing a wear-resistant coating and a preparation method thereof, so as to solve the problems raised in the prior art.

[0007] To achieve the above object, the present invention provides the following technical solutions: A method for preparing a high-speed railway anchor with a wear-resistant coating comprises the following steps: S1: degreasing, water washing, pickling, water washing, and drying the anchor to obtain a pre-treated anchor; S2: placing the pretreated anchor into electroplating solution A for one electroplating; transferring to electroplating solution B for a second electroplating to obtain anchor A; S3: spraying the organic coating on the outer surface of the anchor A, heating and curing, and obtaining the anchor with the wear-resistant coating.

[0008] Preferably, during the electroplating process, the temperature is 70-80°C and the current density is 8-10A / dm 2, time is 10~20min; during the secondary electroplating process, the temperature is 70~80℃, the current density is 2~5A / dm 2 , time is 1.5~2h.

[0009] Preferably, the electroplating solution A comprises the following substances: 80-90 g / L nickel sulfate hexahydrate, 32-35 g / L sodium tungstate dihydrate, 50-55 g / L sodium citrate dihydrate, 20-24 g / L sodium dihydrogen phosphate, 12-15 g / L lactic acid, 30-34 g / L ammonium sulfate, 2-3 g / L ammonium thiocyanate, and 3-4 g / L 8-aminoquinoline; The electroplating solution B includes the following substances: 45-51 g / L nickel sulfate hexahydrate, 32-35 g / L sodium tungstate dihydrate, 50-55 g / L sodium citrate dihydrate, 20-24 g / L sodium dihydrogen phosphate, 12-15 g / L lactic acid, 30-34 g / L ammonium sulfate, 2-3 g / L ammonium thiocyanate, 3-5 g / L modified nanoparticles, and 3-4 g / L 8-aminoquinoline.

[0010] Preferably, the method for preparing the modified nanoparticles comprises the following steps: (1) Add nano boron nitride to 60% ethanol solution and disperse it evenly by ultrasonication, add 3-aminopropyltriethoxysilane, stir at 30-40°C for 6-8h, centrifuge, wash, and dry to obtain amino-modified nano boron nitride; (2) adding the amino-modified nano-boron nitride to a 1-2 wt% tris(hydroxymethyl)aminomethane buffer solution, uniformly dispersing by ultrasonication, adjusting the pH to 8-9, adding 1-1.5 wt% graphene oxide dispersion, dopamine hydrochloride and an activator, stirring at 35-40°C for 12-18 h, centrifuging, washing and drying to obtain modified graphene; (3) The modified graphene is dispersed in acetone, acetic acid is gradually added dropwise, stirred at 25-30 °C for 4-5 h, centrifuged, washed, and freeze-dried to obtain 2,6-di-tert-butyl modified nanoparticles.

[0011] Preferably, the amino-modified nano-boron nitride comprises the following raw materials, by mass: 2-4 parts of nano-boron nitride, 70-80 parts of 60% ethanol solution, and 1-2 parts of 3-aminopropyltriethoxysilane; The modified graphene includes the following raw materials, calculated by weight: 0.5-1 parts of amino-modified nano boron nitride, 100-150 parts of 1.5wt% tris(hydroxymethyl)aminomethane) buffer solution, 40-50 parts of 1wt% graphene oxide dispersion, 2-3 parts of dopamine hydrochloride, and 0.01-0.02 parts of an activator; The modified nanoparticles include the following raw materials, calculated by mass: 1-2 parts of modified graphene, 30-40 parts of acetone, and 2-3 parts of acetic acid.

[0012] Preferably, during the heating and curing process, the temperature is 140-160° C. and the time is 2-4 hours; and the spraying thickness of the organic coating is 10-15 μm.

[0013] Preferably, the preparation method of the organic coating comprises the following steps: heating bisphenol A epoxy resin to 70-75° C., adding modified nano titanium dioxide, castor oil glycidyl ether, and azobisisobutyronitrile, stirring for 3-4 hours, adding 2,6-di-tert-butyl-p-cresol and diaminodiphenylmethane to obtain an organic coating.

[0014] Preferably, the organic coating comprises the following raw materials, in parts by mass: 100-120 parts of bisphenol A epoxy resin, 10-14 parts of castor oil glycidyl ether, 0.02-0.05 parts of azobisisobutyronitrile, 0.5-1 parts of 2,6-di-tert-butyl-p-cresol, and 25-27 parts of diaminodiphenylmethane.

[0015] Preferably, the preparation method of the modified nano titanium dioxide comprises the following steps: adding nano titanium dioxide to 60% anhydrous ethanol and dispersing it evenly, adding 3-mercaptopropyltrimethoxysilane, stirring at 50-60° C. for 2-4 hours, filtering, washing, and drying to obtain modified nano titanium dioxide.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) A layer of Ni-WP alloy coating is electroplated on the surface of the substrate, which has good corrosion resistance and wear resistance, but the coating after electroplating will have defects, prone to cracks and poor bonding with the substrate, resulting in problems such as decreased wear resistance and corrosion resistance. The present invention introduces graphene oxide and hexagonal boron nitride in the electroplating process, which can penetrate and fill cracks, increase the density of the coating, reduce the entry of corrosive media, and increase corrosion resistance. At the same time, graphene oxide has excellent mechanical strength and flexibility, while hexagonal boron nitride has high hardness and low friction coefficient. The synergistic effect of the two can significantly improve the wear resistance and adhesion of the coating. Polydopamine has good viscosity and is easy to adhere to the surface of the substrate. By grafting boron nitride and graphene oxide onto polydopamine, its dispersibility is improved, which also helps the adhesion of nanoparticles to the substrate. The amino groups contained in polydopamine can be protonated to make it positively charged, which improves its dispersibility and brings it closer to the electrode, thereby improving the electroplating effect, increasing the density of the coating, and thus improving corrosion resistance.

[0017] (2) The present invention also adds 8-aminoquinoline to the electroplating solution, which can coordinate with metal ions to reduce the precipitation of metal ions and improve the stability of the plating solution. At the same time, during the electroplating process, it can also be embedded in the plating layer with the electroplating, and fix the iron ions by coordination, thereby increasing the corrosion resistance.

[0018] (3) The present invention uses a high current density first and then a low current density electroplating strategy, which can quickly form an initial coating in the early stage of electroplating, improve the uniformity and coverage of the coating, and the subsequent low current density is used to optimize the crystal quality and performance of the coating, thereby obtaining a high-quality coating, improving the density of the coating, and enhancing corrosion resistance. However, when the current density is too high, the internal stress in the coating increases, and it is easy to fall off, resulting in a decrease in the quality of the coating.

[0019] (4) The surface of the coating of the present invention after electroplating will have hydrophilic groups such as amino groups and hydroxyl groups, which makes the substrate surface wettable and corrodes in the solution. Therefore, the present invention adds a layer of epoxy resin coating on the basis of the coating to react with the amino groups and hydroxyl groups, thereby improving the adhesion of the coating and also increasing the corrosion resistance. DETAILED DESCRIPTION

[0020] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0021] It should be noted that the purchase manufacturers of all raw materials involved in the present invention are not subject to any special restrictions and exemplarily include: nano boron nitride, Bnitril N-1, provided by Jiangxi Liankai Chemical Co., Ltd.; 3-aminopropyltriethoxysilane, CAS No.: 919-30-2; trishydroxymethylaminomethane, CAS No.: 77-86-1; graphene oxide dispersion, flake diameter > 10 μm, provided by Zhongke Yueda (Shanghai) Materials Technology Co., Ltd.; dopamine hydrochloride, CAS No.: 62-31-7; nano titanium dioxide, particle size of 60~80nm; 3-mercaptopropyltrimethoxysilane, CAS No.: 4420-74-0; bisphenol A epoxy resin, CAS No.: 16 75-54-3; castor oil glycidyl ether, CAS number: 74398-71-3; 2,6-di-tert-butyl-p-cresol, CAS number: 128-37-0; diaminodiphenylmethane, CAS number: 101-77-9; nickel sulfate hexahydrate; sodium tungstate dihydrate, CAS number: 10213-10-2; sodium citrate dihydrate; sodium dihydrogen phosphate; lactic acid; ammonium thiocyanate; 8-aminoquinoline, CAS number: 578-66-5; anchors, railway anchor bolts, provided by Kunshan Alex Railway Accessories Co., Ltd.

[0022] In the following examples, parts are parts by mass, and the raw materials mentioned above and used but not mentioned in the following examples are all commercially available.

[0023] Example 1: Step 1: Preparation of modified nanoparticles: (1) Add 3 parts of nano boron nitride to 75 parts of 60% ethanol solution and disperse them evenly by ultrasonication, add 1.5 parts of 3-aminopropyltriethoxysilane, stir at 35°C for 7 hours, centrifuge, wash, and dry to obtain amino-modified nano boron nitride; (2) adding 0.5 parts of amino-modified nano-boron nitride to 125 parts of 1.5wt% tris(hydroxymethyl)aminomethane) buffer solution, uniformly dispersing by ultrasonication, adjusting the pH to 8.5, adding 45 parts of 1wt% graphene oxide dispersion, 2.5 parts of dopamine hydrochloride and 0.01 parts of activator, stirring at 35°C for 16h, centrifuging, washing and drying to obtain modified graphene; (3) dispersing 1.5 parts of modified graphene in 35 parts of acetone, gradually adding 2.5 parts of acetic acid, stirring at 30°C for 4.5 hours, centrifuging, washing, and freeze-drying to obtain modified nanoparticles; Step 2: Preparation of modified nano-titanium dioxide: 3 parts of nano titanium dioxide were added to 75 parts of 60% anhydrous ethanol and dispersed evenly, 2 parts of 3-mercaptopropyltrimethoxysilane were added, stirred at 55°C for 3 hours, filtered, washed, and dried to obtain modified nano titanium dioxide; Step 3: Preparation of organic coating: 110 parts of bisphenol A epoxy resin were heated to 70°C, 2 parts of modified nano titanium dioxide, 12 parts of castor oil glycidyl ether, and 0.03 parts of azobisisobutyronitrile were added, and stirred for 3.5 hours, and 0.5 parts of 2,6-di-tert-butyl-p-cresol antioxidant and 26 parts of diaminodiphenylmethane were added to obtain an organic coating; Step 4: Preparation of wear-resistant coating: S1: degreasing, water washing, pickling, water washing, and drying the anchor to obtain a pre-treated anchor; S2: Place the pretreated anchor into electroplating solution A at 75°C with a current density of 9A / dm 2 The electroplating was carried out for 15 min at a time; the electroplating solution was transferred to electroplating solution B and the current density was 3 A / dm at 75 °C. 2 The anchor A was obtained by secondary electroplating for 1.5 h; S3: Spray the organic coating on the outer surface of the anchor A and cure it at 150° C. for 3 h to obtain an anchor with a wear-resistant coating.

[0024] Wherein, the electroplating solution A includes the following substances: 85g / L nickel sulfate hexahydrate, 34g / L sodium tungstate dihydrate, 52g / L sodium citrate dihydrate, 22g / L sodium dihydrogen phosphate, 13g / L lactic acid, 32g / L ammonium sulfate, 2.5g / L ammonium thiocyanate, 3.5g / L 8-aminoquinoline; Plating solution B includes the following substances: 48 g / L nickel sulfate hexahydrate, 34 g / L sodium tungstate dihydrate, 52 g / L sodium citrate dihydrate, 22 g / L sodium dihydrogen phosphate, 13 g / L lactic acid, 32 g / L ammonium sulfate, 2.5 g / L ammonium thiocyanate, 4 g / L modified nanoparticles, and 3.5 g / L 8-aminoquinoline.

[0025] Example 2: Step 1: Preparation of modified nanoparticles: (1) Add 3 parts of nano boron nitride to 75 parts of 60% ethanol solution and disperse them evenly by ultrasonication, add 1.5 parts of 3-aminopropyltriethoxysilane, stir at 35°C for 7 hours, centrifuge, wash, and dry to obtain amino-modified nano boron nitride; (2) adding 0.5 parts of amino-modified nano-boron nitride to 125 parts of 1.5wt% tris(hydroxymethyl)aminomethane) buffer solution, uniformly dispersing by ultrasonication, adjusting the pH to 8.5, adding 45 parts of 1wt% graphene oxide dispersion, 2.5 parts of dopamine hydrochloride and 0.01 parts of activator, stirring at 35°C for 16h, centrifuging, washing and drying to obtain modified graphene; (3) dispersing 1.5 parts of modified graphene in 35 parts of acetone, gradually adding 2.5 parts of acetic acid, stirring at 30°C for 4.5 hours, centrifuging, washing, and freeze-drying to obtain modified nanoparticles; Step 2: Preparation of modified nano-titanium dioxide: 3 parts of nano titanium dioxide were added to 75 parts of 60% anhydrous ethanol and dispersed evenly, 2 parts of 3-mercaptopropyltrimethoxysilane were added, stirred at 55°C for 3 hours, filtered, washed, and dried to obtain modified nano titanium dioxide; Step 3: Preparation of organic coating: 110 parts of bisphenol A epoxy resin were heated to 70°C, 2 parts of modified nano titanium dioxide, 12 parts of castor oil glycidyl ether, and 0.03 parts of azobisisobutyronitrile were added, and stirred for 3.5 hours, and 0.5 parts of 2,6-di-tert-butyl-p-cresol antioxidant and 26 parts of diaminodiphenylmethane were added to obtain an organic coating; Step 4: Preparation of wear-resistant coating: S1: degreasing, water washing, pickling, water washing, and drying the anchor to obtain a pre-treated anchor; S2: Place the pretreated anchor into electroplating solution A at 70°C with a current density of 8A / dm 2 The electroplating was performed for 10 min at a time; the electroplating solution was transferred to electroplating solution B and the current density was 2 A / dm at 70 °C. 2 The anchor A was obtained by secondary electroplating for 1.5 h; S3: Spray the organic coating on the outer surface of the anchor A and cure it at 140° C. for 2 h to obtain an anchor with a wear-resistant coating.

[0026] Wherein, the electroplating solution A includes the following substances: 80g / L nickel sulfate hexahydrate, 32g / L sodium tungstate dihydrate, 50g / L sodium citrate dihydrate, 20g / L sodium dihydrogen phosphate, 12g / L lactic acid, 30g / L ammonium sulfate, 2g / L ammonium thiocyanate, and 3g / L 8-aminoquinoline; Plating solution B includes the following substances: 45 g / L nickel sulfate hexahydrate, 32 g / L sodium tungstate dihydrate, 50 g / L sodium citrate dihydrate, 20 g / L sodium dihydrogen phosphate, 12 g / L lactic acid, 30 g / L ammonium sulfate, 2 g / L ammonium thiocyanate, 3 g / L modified nanoparticles, and 3 g / L 8-aminoquinoline.

[0027] Example 3: Step 1: Preparation of modified nanoparticles: (1) Add 3 parts of nano boron nitride to 75 parts of 60% ethanol solution and disperse them evenly by ultrasonication, add 1.5 parts of 3-aminopropyltriethoxysilane, stir at 35°C for 7 hours, centrifuge, wash, and dry to obtain amino-modified nano boron nitride; (2) adding 0.5 parts of amino-modified nano-boron nitride to 125 parts of 1.5wt% tris(hydroxymethyl)aminomethane) buffer solution, uniformly dispersing by ultrasonication, adjusting the pH to 8.5, adding 45 parts of 1wt% graphene oxide dispersion, 2.5 parts of dopamine hydrochloride and 0.01 parts of activator, stirring at 35°C for 16h, centrifuging, washing and drying to obtain modified graphene; (3) dispersing 1.5 parts of modified graphene in 35 parts of acetone, gradually adding 2.5 parts of acetic acid, stirring at 30°C for 4.5 hours, centrifuging, washing, and freeze-drying to obtain modified nanoparticles; Step 2: Preparation of modified nano-titanium dioxide: 3 parts of nano titanium dioxide were added to 75 parts of 60% anhydrous ethanol and dispersed evenly, 2 parts of 3-mercaptopropyltrimethoxysilane were added, stirred at 55°C for 3 hours, filtered, washed, and dried to obtain modified nano titanium dioxide; Step 3: Preparation of organic coating: 110 parts of bisphenol A epoxy resin were heated to 70°C, 2 parts of modified nano titanium dioxide, 12 parts of castor oil glycidyl ether, and 0.03 parts of azobisisobutyronitrile were added, and stirred for 3.5 hours, and 0.5 parts of 2,6-di-tert-butyl-p-cresol antioxidant and 26 parts of diaminodiphenylmethane were added to obtain an organic coating; Step 4: Preparation of wear-resistant coating: S1: degreasing, water washing, pickling, water washing, and drying the anchor to obtain a pre-treated anchor; S2: Place the pretreated anchor into electroplating solution A at 80°C with a current density of 10A / dm 2 The electroplating was performed for 20 min at a time; the electroplating solution was transferred to electroplating solution B and the current density was 5 A / dm at 80 °C. 2After the second electroplating for 2 h, anchor A was obtained; S3: Spray the organic coating on the outer surface of the anchor A and cure it at 160° C. for 4 h to obtain an anchor with a wear-resistant coating.

[0028] Wherein, the electroplating solution A includes the following substances: 90g / L nickel sulfate hexahydrate, 35g / L sodium tungstate dihydrate, 55g / L sodium citrate dihydrate, 24g / L sodium dihydrogen phosphate, 15g / L lactic acid, 34g / L ammonium sulfate, 3g / L ammonium thiocyanate, 4g / L 8-aminoquinoline; Plating solution B includes the following substances: 51 g / L nickel sulfate hexahydrate, 35 g / L sodium tungstate dihydrate, 55 g / L sodium citrate dihydrate, 24 g / L sodium dihydrogen phosphate, 15 g / L lactic acid, 34 g / L ammonium sulfate, 3 g / L ammonium thiocyanate, 5 g / L modified nanoparticles, and 4 g / L 8-aminoquinoline.

[0029] Comparative Example 1: Based on Example 1, only the secondary electroplating treatment is performed, and the other processes remain unchanged, as follows: Step 1: Preparation of modified nanoparticles: (1) Add 3 parts of nano boron nitride to 75 parts of 60% ethanol solution and disperse them evenly by ultrasonication, add 1.5 parts of 3-aminopropyltriethoxysilane, stir at 35°C for 7 hours, centrifuge, wash, and dry to obtain amino-modified nano boron nitride; (2) adding 0.5 parts of amino-modified nano-boron nitride to 125 parts of 1.5wt% tris(hydroxymethyl)aminomethane) buffer solution, uniformly dispersing by ultrasonication, adjusting the pH to 8.5, adding 45 parts of 1wt% graphene oxide dispersion, 2.5 parts of dopamine hydrochloride and 0.01 parts of activator, stirring at 35°C for 16h, centrifuging, washing and drying to obtain modified graphene; (3) dispersing 1.5 parts of modified graphene in 35 parts of acetone, gradually adding 2.5 parts of acetic acid, stirring at 30°C for 4.5 hours, centrifuging, washing, and freeze-drying to obtain modified nanoparticles; Step 2: Preparation of modified nano-titanium dioxide: 3 parts of nano titanium dioxide were added to 75 parts of 60% anhydrous ethanol and dispersed evenly, 2 parts of 3-mercaptopropyltrimethoxysilane were added, stirred at 55°C for 3 hours, filtered, washed, and dried to obtain modified nano titanium dioxide; Step 3: Preparation of organic coating: 110 parts of bisphenol A epoxy resin were heated to 70°C, 2 parts of modified nano titanium dioxide, 12 parts of castor oil glycidyl ether, and 0.03 parts of azobisisobutyronitrile were added, and stirred for 3.5 hours, and 0.5 parts of 2,6-di-tert-butyl-p-cresol antioxidant and 26 parts of diaminodiphenylmethane were added to obtain an organic coating; Step 4: Preparation of wear-resistant coating: S1: degreasing, water washing, pickling, water washing, and drying the anchor to obtain a pre-treated anchor; S2: Place the pretreated anchor into electroplating solution B at 75°C with a current density of 3A / dm 2 After electroplating for 1.75 h, anchor A was obtained; S3: Spray the organic coating on the outer surface of the anchor A and cure it at 150° C. for 3 h to obtain an anchor with a wear-resistant coating.

[0030] Plating solution B includes the following substances: 48 g / L nickel sulfate hexahydrate, 34 g / L sodium tungstate dihydrate, 52 g / L sodium citrate dihydrate, 22 g / L sodium dihydrogen phosphate, 13 g / L lactic acid, 32 g / L ammonium sulfate, 2.5 g / L ammonium thiocyanate, 4 g / L modified nanoparticles, and 3.5 g / L 8-aminoquinoline.

[0031] Comparative Example 2: Based on Example 1, polydopamine was not introduced in the process of modifying the nanoparticles, and the other processes remained unchanged, as follows: Step 1: Preparation of modified nanoparticles: (1) Add 3 parts of nano boron nitride to 75 parts of 60% ethanol solution and disperse them evenly by ultrasonication, add 1.5 parts of 3-aminopropyltriethoxysilane, stir at 35°C for 7 hours, centrifuge, wash, and dry to obtain amino-modified nano boron nitride; (2) adding 0.5 parts of amino-modified nano-boron nitride to 125 parts of 1.5wt% tris(hydroxymethyl)aminomethane) buffer solution, uniformly dispersing by ultrasonication, adjusting the pH to 8.5, adding 45 parts of 1wt% graphene oxide dispersion and 0.01 parts of activator, stirring at 35°C for 16h, centrifuging, washing, and drying to obtain modified nanoparticles; Step 2: Preparation of modified nano-titanium dioxide: 3 parts of nano titanium dioxide were added to 75 parts of 60% anhydrous ethanol and dispersed evenly, 2 parts of 3-mercaptopropyltrimethoxysilane were added, stirred at 55°C for 3 hours, filtered, washed, and dried to obtain modified nano titanium dioxide; Step 3: Preparation of organic coating: 110 parts of bisphenol A epoxy resin were heated to 70°C, 2 parts of modified nano titanium dioxide, 12 parts of castor oil glycidyl ether, and 0.03 parts of azobisisobutyronitrile were added, and stirred for 3.5 hours, and 0.5 parts of 2,6-di-tert-butyl-p-cresol antioxidant and 26 parts of diaminodiphenylmethane were added to obtain an organic coating; Step 4: Preparation of wear-resistant coating: S1: degreasing, water washing, pickling, water washing, and drying the anchor to obtain a pre-treated anchor; S2: Place the pretreated anchor into electroplating solution A at 75°C with a current density of 9A / dm 2The electroplating was carried out for 15 min at a time; the electroplating solution was transferred to electroplating solution B and the current density was 3 A / dm at 75 °C. 2 The anchor A was obtained by secondary electroplating for 1.5 h; S3: Spray the organic coating on the outer surface of the anchor A and cure it at 150° C. for 3 h to obtain an anchor with a wear-resistant coating.

[0032] Wherein, the electroplating solution A includes the following substances: 85g / L nickel sulfate hexahydrate, 34g / L sodium tungstate dihydrate, 52g / L sodium citrate dihydrate, 22g / L sodium dihydrogen phosphate, 13g / L lactic acid, 32g / L ammonium sulfate, 2.5g / L ammonium thiocyanate, 3.5g / L 8-aminoquinoline; Plating solution B includes the following substances: 48 g / L nickel sulfate hexahydrate, 34 g / L sodium tungstate dihydrate, 52 g / L sodium citrate dihydrate, 22 g / L sodium dihydrogen phosphate, 13 g / L lactic acid, 32 g / L ammonium sulfate, 2.5 g / L ammonium thiocyanate, 4 g / L modified nanoparticles, and 3.5 g / L 8-aminoquinoline.

[0033] Comparative Example 3: Based on Example 1, 8-aminoquinoline was not added to the electroplating solutions A and B, and the rest of the process remained unchanged, as follows: Step 1: Preparation of modified nanoparticles: (1) Add 3 parts of nano boron nitride to 75 parts of 60% ethanol solution and disperse them evenly by ultrasonication, add 1.5 parts of 3-aminopropyltriethoxysilane, stir at 35°C for 7 hours, centrifuge, wash, and dry to obtain amino-modified nano boron nitride; (2) adding 0.5 parts of amino-modified nano-boron nitride to 125 parts of 1.5wt% tris(hydroxymethyl)aminomethane) buffer solution, uniformly dispersing by ultrasonication, adjusting the pH to 8.5, adding 45 parts of 1wt% graphene oxide dispersion, 2.5 parts of dopamine hydrochloride and 0.01 parts of activator, stirring at 35°C for 16h, centrifuging, washing and drying to obtain modified graphene; (3) dispersing 1.5 parts of modified graphene in 35 parts of acetone, gradually adding 2.5 parts of acetic acid, stirring at 30°C for 4.5 hours, centrifuging, washing, and freeze-drying to obtain modified nanoparticles; Step 2: Preparation of modified nano-titanium dioxide: 3 parts of nano titanium dioxide were added to 75 parts of 60% anhydrous ethanol and dispersed evenly, 2 parts of 3-mercaptopropyltrimethoxysilane were added, stirred at 55°C for 3 hours, filtered, washed, and dried to obtain modified nano titanium dioxide; Step 3: Preparation of organic coating: 110 parts of bisphenol A epoxy resin were heated to 70°C, 2 parts of modified nano titanium dioxide, 12 parts of castor oil glycidyl ether, and 0.03 parts of azobisisobutyronitrile were added, and stirred for 3.5 hours, and 0.5 parts of 2,6-di-tert-butyl-p-cresol antioxidant and 26 parts of diaminodiphenylmethane were added to obtain an organic coating; Step 4: Preparation of wear-resistant coating: S1: degreasing, water washing, pickling, water washing, and drying the anchor to obtain a pre-treated anchor; S2: Place the pretreated anchor into electroplating solution A at 75°C with a current density of 9A / dm 2 The electroplating was carried out for 15 min at a time; the electroplating solution was transferred to electroplating solution B and the current density was 3 A / dm at 75 °C. 2 The anchor A was obtained by secondary electroplating for 1.5 h; S3: Spray the organic coating on the outer surface of the anchor A and cure it at 150° C. for 3 h to obtain an anchor with a wear-resistant coating.

[0034] Wherein, the electroplating solution A includes the following substances: 85g / L nickel sulfate hexahydrate, 34g / L sodium tungstate dihydrate, 52g / L sodium citrate dihydrate, 22g / L sodium dihydrogen phosphate, 13g / L lactic acid, 32g / L ammonium sulfate, 2.5g / L ammonium thiocyanate; Plating solution B includes the following substances: 48 g / L nickel sulfate hexahydrate, 34 g / L sodium tungstate dihydrate, 52 g / L sodium citrate dihydrate, 22 g / L sodium dihydrogen phosphate, 13 g / L lactic acid, 32 g / L ammonium sulfate, 2.5 g / L ammonium thiocyanate, and 4 g / L modified nanoparticles.

[0035] Comparative Example 4: Based on Example 1, the current density during the electroplating process is increased, and the other processes remain unchanged, as follows: Step 1: Preparation of modified nanoparticles: (1) Add 3 parts of nano boron nitride to 75 parts of 60% ethanol solution and disperse them evenly by ultrasonication, add 1.5 parts of 3-aminopropyltriethoxysilane, stir at 35°C for 7 hours, centrifuge, wash, and dry to obtain amino-modified nano boron nitride; (2) adding 0.5 parts of amino-modified nano-boron nitride to 125 parts of 1.5wt% tris(hydroxymethyl)aminomethane) buffer solution, uniformly dispersing by ultrasonication, adjusting the pH to 8.5, adding 45 parts of 1wt% graphene oxide dispersion, 2.5 parts of dopamine hydrochloride and 0.01 parts of activator, stirring at 35°C for 16h, centrifuging, washing and drying to obtain modified graphene; (3) dispersing 1.5 parts of modified graphene in 35 parts of acetone, gradually adding 2.5 parts of acetic acid, stirring at 30°C for 4.5 hours, centrifuging, washing, and freeze-drying to obtain modified nanoparticles; Step 2: Preparation of modified nano-titanium dioxide: 3 parts of nano titanium dioxide were added to 75 parts of 60% anhydrous ethanol and dispersed evenly, 2 parts of 3-mercaptopropyltrimethoxysilane were added, stirred at 55°C for 3 hours, filtered, washed, and dried to obtain modified nano titanium dioxide; Step 3: Preparation of organic coating: 110 parts of bisphenol A epoxy resin were heated to 70°C, 2 parts of modified nano titanium dioxide, 12 parts of castor oil glycidyl ether, and 0.03 parts of azobisisobutyronitrile were added, and stirred for 3.5 hours, and 0.5 parts of 2,6-di-tert-butyl-p-cresol antioxidant and 26 parts of diaminodiphenylmethane were added to obtain an organic coating; Step 4: Preparation of wear-resistant coating: S1: degreasing, water washing, pickling, water washing, and drying the anchor to obtain a pre-treated anchor; S2: Place the pretreated anchor into electroplating solution A at 75°C with a current density of 18A / dm 2 The electroplating was carried out for 15 min at a time; the electroplating solution was transferred to electroplating solution B and the current density was 3 A / dm at 75 °C. 2 The anchor A was obtained by secondary electroplating for 1.5 h; S3: Spray the organic coating on the outer surface of the anchor A and cure it at 150° C. for 3 h to obtain an anchor with a wear-resistant coating.

[0036] Wherein, the electroplating solution A includes the following substances: 85g / L nickel sulfate hexahydrate, 34g / L sodium tungstate dihydrate, 52g / L sodium citrate dihydrate, 22g / L sodium dihydrogen phosphate, 13g / L lactic acid, 32g / L ammonium sulfate, 2.5g / L ammonium thiocyanate, 3.5g / L 8-aminoquinoline; Plating solution B includes the following substances: 48 g / L nickel sulfate hexahydrate, 34 g / L sodium tungstate dihydrate, 52 g / L sodium citrate dihydrate, 22 g / L sodium dihydrogen phosphate, 13 g / L lactic acid, 32 g / L ammonium sulfate, 2.5 g / L ammonium thiocyanate, 4 g / L modified nanoparticles, and 3.5 g / L 8-aminoquinoline.

[0037] Performance test: (1) The anchor A of the embodiment and the comparative example was immersed in a 3.5wt% NaCl solution and electrochemically tested using a CS350 electrochemical workstation. The parameters were as follows: scanning at a speed of 1mV / s and a corrosion area of ​​1cm 2 , the potential scanning interval is -0.1~1V, using a corrosion potentiometer, and the experimental data are shown in Table 1; (2) The anchor A of the comparative example and the embodiment is tested for hardness using a HR-150 Rockwell hardness tester, using a multi-position and multi-point testing method, and taking the average value. The experimental data are shown in Table 1 Table 1

[0038] Conclusion: In comparative example 1, only secondary electroplating treatment is performed, and the metal substrate is exposed for a long time, which easily forms an oxide layer or impurities are adsorbed on the surface, resulting in reduced density, corrosion resistance and wear resistance; in comparative example 2, polydopamine is not introduced in the process of modifying the nanoparticles, which is prone to agglomeration, reduced coating uniformity, reduced corrosion resistance and hardness, and correspondingly reduced wear resistance; in comparative example 3, 8-aminoquinoline is not added to electroplating solutions A and B, and iron ions cannot be fixed, thereby reducing corrosion resistance; in comparative example 4, the current density in the primary electroplating process is increased, but when the current density is too large, the internal stress in the coating increases, it is easy to fall off, the density is low, the corrosion resistance and hardness decrease, and the wear resistance is low.

[0039] In summary, the present invention improves the wear resistance and the corrosion resistance by introducing the Ni-WP alloy plating layer and the organic coating added with modified nanoparticles on the surface of the substrate.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a high-speed railway anchor with a wear-resistant coating, characterized in that: The following steps are involved: S1: degreasing, water washing, pickling, water washing, and drying the anchor to obtain a pre-treated anchor; S2: placing the pretreated anchor into electroplating solution A for one electroplating; transferring to electroplating solution B for a second electroplating to obtain anchor A; S3: spraying the organic coating on the outer surface of the anchor A, heating and curing, and obtaining the anchor with the wear-resistant coating.

2. The method for preparing a high-speed railway anchor with a wear-resistant coating according to claim 1, characterized in that: During the electroplating process, the temperature is 70-80°C and the current density is 8-10A / dm 2 , time is 10~20min; during the secondary electroplating process, the temperature is 70~80℃, the current density is 2~5A / dm 2 , time is 1.5~2h.

3. The method for preparing a high-speed railway anchor with a wear-resistant coating according to claim 1, characterized in that: The electroplating solution A includes the following substances: 80-90 g / L nickel sulfate hexahydrate, 32-35 g / L sodium tungstate dihydrate, 50-55 g / L sodium citrate dihydrate, 20-24 g / L sodium dihydrogen phosphate, 12-15 g / L lactic acid, 30-34 g / L ammonium sulfate, 2-3 g / L ammonium thiocyanate, and 3-4 g / L 8-aminoquinoline; The electroplating solution B includes the following substances: 45-51 g / L nickel sulfate hexahydrate, 32-35 g / L sodium tungstate dihydrate, 50-55 g / L sodium citrate dihydrate, 20-24 g / L sodium dihydrogen phosphate, 12-15 g / L lactic acid, 30-34 g / L ammonium sulfate, 2-3 g / L ammonium thiocyanate, 3-5 g / L modified nanoparticles, and 3-4 g / L 8-aminoquinoline.

4. The method for preparing a high-speed railway anchor with a wear-resistant coating according to claim 3, characterized in that: The preparation method of the modified nanoparticles comprises the following steps: (1) Add nano boron nitride to 60% ethanol solution and disperse it evenly by ultrasonication, add 3-aminopropyltriethoxysilane, stir at 30-40°C for 6-8h, centrifuge, wash, and dry to obtain amino-modified nano boron nitride; (2) adding the amino-modified nano-boron nitride to a 1-2 wt% tris(hydroxymethyl)aminomethane buffer solution, uniformly dispersing by ultrasonication, adjusting the pH to 8-9, adding 1-1.5 wt% graphene oxide dispersion, dopamine hydrochloride and an activator, stirring at 35-40°C for 12-18 h, centrifuging, washing and drying to obtain modified graphene; (3) Dispersing the modified graphene in acetone, gradually adding acetic acid, stirring at 25-30 °C for 4-5 h, centrifuging, washing, and freeze-drying to obtain modified nanoparticles.

5. The method for preparing a high-speed railway anchor with a wear-resistant coating according to claim 4, characterized in that: The amino-modified nano boron nitride comprises the following raw materials, calculated by mass: 2-4 parts of nano boron nitride, 70-80 parts of 60% ethanol solution, and 1-2 parts of 3-aminopropyltriethoxysilane; The modified graphene includes the following raw materials, calculated by weight: 0.5-1 parts of amino-modified nano boron nitride, 100-150 parts of 1.5wt% tris(hydroxymethyl)aminomethane) buffer solution, 40-50 parts of 1wt% graphene oxide dispersion, 2-3 parts of dopamine hydrochloride, and 0.01-0.02 parts of an activator; The modified nanoparticles include the following raw materials, calculated by mass: 1-2 parts of modified graphene, 30-40 parts of acetone, and 2-3 parts of acetic acid.

6. The method for preparing a high-speed railway anchor with a wear-resistant coating according to claim 1, characterized in that: During the heating and curing process, the temperature is 140-160° C. and the time is 2-4 hours; the spraying thickness of the organic coating is 10-15 μm.

7. The method for preparing a high-speed railway anchor with a wear-resistant coating according to claim 1, characterized in that: The preparation method of the organic coating comprises the following steps: heating bisphenol A epoxy resin to 70-75° C., adding modified nano titanium dioxide, castor oil glycidyl ether and azobisisobutyronitrile, stirring for 3-4 hours, adding 2,6-di-tert-butyl-p-cresol and diaminodiphenylmethane to obtain the organic coating.

8. The method for preparing a high-speed railway anchor with a wear-resistant coating according to claim 7, characterized in that: The organic coating comprises the following raw materials, calculated by mass: 100-120 parts of bisphenol A epoxy resin, 10-14 parts of castor oil glycidyl ether, 0.02-0.05 parts of azobisisobutyronitrile, 0.5-1 parts of 2,6-di-tert-butyl-p-cresol, and 25-27 parts of diaminodiphenylmethane.

9. The method for preparing a high-speed railway anchor with a wear-resistant coating according to claim 7, characterized in that: The preparation method of the modified nano titanium dioxide comprises the following steps: adding nano titanium dioxide into 60% anhydrous ethanol to disperse uniformly, adding 3-mercaptopropyltrimethoxysilane, stirring at 50-60° C. for 2-4 hours, filtering, washing and drying to obtain the modified nano titanium dioxide.

10. Prepared by the method for preparing a high-speed railway anchor with a wear-resistant coating according to any one of claims 1 to 9.

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