A wheel carrier and a method of manufacturing the same

Abstract

The application belongs to the technical field of stainless steel wheel carrier, and particularly relates to a wheel carrier and a preparation method thereof. The wheel carrier optimizes the composition of a stainless steel base body, and then uses Cu2O particles for modification, so that the light absorption range of TiO2 nanotubes is widened, the transfer of photo-generated electrons is promoted, the separation of photo-generated electrons and holes is increased, and the utilization efficiency of visible light is increased, so that good cathodic protection effect is achieved on the stainless steel, and the corrosion resistance of the stainless steel is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of stainless steel wheel frame technology, specifically relating to a wheel frame and its preparation method. Background Technology

[0002] With the accelerated pace of transformation and upgrading in the manufacturing industry and the pursuit of high-quality development, the fields of mechanization and automation are developing rapidly, making the demand for automated assembly of material handling vehicles increasingly urgent. Material handling vehicles are widely used in logistics, warehouses, factories, hospitals, schools, shopping malls, airports, stadiums, stations, etc. The wheel frame of the material handling vehicle plays a supporting role, and when moving various kinds of goods, it not only needs to have strong strength, but also high corrosion resistance.

[0003] Common stainless steel wheel frames possess excellent mechanical properties, but in humid, coastal environments... - It will damage the surface passivation film and promote corrosion. Commonly used anti-corrosion methods include organic coatings and electrochemical protection, but a single method cannot comprehensively improve the anti-corrosion efficiency and needs to be combined with other methods to achieve effective protection of stainless steel. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a wheel frame with good corrosion resistance.

[0005] The above-mentioned objective of the present invention is achieved by the following scheme: a wheel frame, the stainless steel wheel frame comprising a stainless steel substrate and a protective layer on the surface of the substrate, wherein the composition and mass percentage content of the stainless steel substrate are: 0.25-0.26% C, 0.58-0.65% Mn, 0.01-0.15% P, 0.1-0.15% Si, 5-5.5% Cr, 8-8.5% Ni, 0.2-0.23% Mo, with the balance being Fe and unavoidable trace elements.

[0006] In one of the aforementioned wheel frames, the protective layer is an aqueous coating containing Cu2O and TiO2. This invention also provides a method for preparing the aforementioned wheel frame, the method comprising the following steps: adding Cu2O to a TiO2 nanotube array for ultrasonic composite formation, followed by drying and calcination to obtain a Cu2O / TiO2 composite material; then dispersing the Cu2O / TiO2 composite material in an epoxy aqueous emulsion by stirring to obtain an aqueous coating; then uniformly coating the aqueous coating onto the surface of a stainless steel wheel frame substrate; and finally drying to obtain a stainless steel wheel frame.

[0007] TiO2 nanotubes have a regular surface and uniform pore size, approximately 100–130 nm. Cu2O particles are mostly deposited on the inner wall and at the tube opening, without altering the crystal structure of the TiO2 nanotubes. Increasing the amount of Cu2O added will clog the tube opening, causing a decrease in performance.

[0008] In one of the above-mentioned methods for preparing a wheel frame, the mass ratio of TiO2 nanotube array to Cu2O is (10-15):1.

[0009] As a preferred method, ultrasonic composite is specifically performed by adding Cu2O to a TiO2 nanotube array and ultrasonically dispersing it in ethanol for 1-5 hours.

[0010] Modification with Cu2O particles broadens the light absorption range of TiO2 nanotubes, while promoting the transfer of photogenerated electrons, increasing the separation of photogenerated electrons and holes, and increasing the utilization efficiency of visible light. This results in better cathodic protection for stainless steel and greatly improves its corrosion resistance.

[0011] In one of the above-mentioned wheel frame preparation methods, the drying and calcination temperature is 60-80℃.

[0012] In one of the above-mentioned wheel frame preparation methods, the mass ratio of Cu2O / TiO2 composite material to epoxy aqueous emulsion is 1:(8-10). By controlling the mass ratio of Cu2O / TiO2 composite material to epoxy aqueous emulsion, the composite material can maintain good dispersion stability in the aqueous emulsion.

[0013] In one of the above-mentioned wheel frame preparation methods, the preparation method of the epoxy aqueous emulsion includes: mixing polyether alcohol diglycidyl ether and ethanolamine to obtain a reactant, and then adding urushiol epoxy resin to obtain the epoxy aqueous emulsion.

[0014] In one of the above-mentioned wheel frame preparation methods, the molar ratio of polyether alcohol diglycidyl ether and ethanolamine is 1:(1-1.5).

[0015] In one of the above-mentioned methods for preparing a wheel frame, the molar ratio of the reactants to urushiol epoxy resin is 1:(2-5).

[0016] In one of the above-mentioned wheel frame preparation methods, the drying temperature is 45-55℃ and the time is 20-30h.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The wheel frame of the present invention optimizes the composition of the stainless steel matrix and then uses Cu2O particles to broaden the light absorption range of TiO2 nanotubes. At the same time, it promotes the transfer of photogenerated electrons, increases the separation of photogenerated electrons and holes, and increases the utilization efficiency of visible light, thereby providing better cathodic protection for stainless steel and greatly improving the corrosion resistance of stainless steel. Detailed Implementation

[0018] The following are specific embodiments of the present invention, which further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0019] Example 1:

[0020] Cu2O was added to a TiO2 nanotube array at a mass ratio of 12:1 and ultrasonically dispersed in ethanol. The mixture was ultrasonically composited for 2 hours and then calcined at 80°C to obtain a Cu2O / TiO2 composite material. The Cu2O / TiO2 composite material was then placed in an epoxy aqueous emulsion at a mass ratio of 1:9 and stirred to obtain an aqueous coating. The aqueous coating was then uniformly coated onto the surface of a stainless steel wheel frame substrate. Finally, the substrate was dried at 50°C for 25 hours to obtain a stainless steel wheel frame.

[0021] The stainless steel wheel frame matrix composition and its mass percentage content are as follows: 0.26% C, 0.61% Mn, 0.08% P, 0.12% Si, 5.3% Cr, 8.2% Ni, 0.21% Mo, with the balance being Fe and unavoidable trace elements.

[0022] The preparation method of epoxy aqueous emulsion is as follows: polyether alcohol diglycidyl ether and ethanolamine are mixed at a molar ratio of 1:1.2 to obtain reactants, and then reacted with urushiol epoxy resin at a molar ratio of 1:3 at 75°C for 6 hours to obtain epoxy aqueous emulsion.

[0023] Example 2:

[0024] Cu2O was added to a TiO2 nanotube array at a mass ratio of 10:1 and ultrasonically dispersed in ethanol. The mixture was ultrasonically composited for 2 hours and then calcined at 70°C to obtain a Cu2O / TiO2 composite material. The Cu2O / TiO2 composite material was then placed in an epoxy aqueous emulsion at a mass ratio of 8:1 and stirred to obtain an aqueous coating. The aqueous coating was then uniformly coated onto the surface of a stainless steel wheel frame substrate. Finally, the substrate was dried at 45°C for 20 hours to obtain a stainless steel wheel frame.

[0025] The stainless steel wheel frame matrix composition and its mass percentage content are as follows: 0.25% C, 0.58% Mn, 0.01% P, 0.1% Si, 5% Cr, 8% Ni, 0.2% Mo, with the balance being Fe and unavoidable trace elements.

[0026] The preparation method of epoxy aqueous emulsion is as follows: polyether alcohol diglycidyl ether and ethanolamine are mixed at a molar ratio of 1:1 to obtain reactants, and then reacted with urushiol epoxy resin at a molar ratio of 1:2 at 75°C for 6 hours to obtain epoxy aqueous emulsion.

[0027] Example 3:

[0028] Cu2O was added to a TiO2 nanotube array at a mass ratio of 15:1 and ultrasonically dispersed in ethanol. The mixture was ultrasonically composited for 2 hours and then calcined at 90°C to obtain a Cu2O / TiO2 composite material. The Cu2O / TiO2 composite material was then placed in an epoxy aqueous emulsion at a mass ratio of 10:1 and stirred to obtain an aqueous coating. The aqueous coating was then uniformly coated onto the surface of a stainless steel wheel frame substrate. Finally, the substrate was dried at 55°C for 30 hours to obtain a stainless steel wheel frame.

[0029] The stainless steel wheel frame matrix composition and its mass percentage content are as follows: 0.26% C, 0.65% Mn, 0.15% P, 0.15% Si, 5.5% Cr, 8.5% Ni, 0.23% Mo, with the balance being Fe and unavoidable trace elements.

[0030] The preparation method of epoxy aqueous emulsion is as follows: polyether alcohol diglycidyl ether and ethanolamine are mixed at a molar ratio of 1:1.5 to obtain reactants, and then reacted with urushiol epoxy resin at a molar ratio of 1:5 at 75°C for 6 hours to obtain epoxy aqueous emulsion.

[0031] Comparative Example 1:

[0032] The only difference from Example 1 is that the protective layer is an aqueous coating containing TiO2.

[0033] Comparative Example 2:

[0034] The only difference from Example 1 is that the protective layer is an aqueous coating containing Cu2O.

[0035] Corrosion resistance tests were conducted on Examples 1-2 and Comparative Example 1, respectively:

[0036] Salt spray test for 600 hours was conducted according to GB / T2423, 17-2008;

[0037] The acid resistance test was conducted by immersing the sample in 5 wt% hydrochloric acid at 25°C for 10 hours, and the alkali resistance test was conducted by immersing the sample in 5 wt% sodium hydroxide at 25°C for 10 hours.

[0038] Table 1: Corrosion resistance test results of stainless steel wheel frames prepared in Examples 1-2 and Comparative Examples 1-3

[0039]

[0040] In summary, this invention optimizes the composition of the stainless steel matrix and then modifies it with Cu2O particles to broaden the light absorption range of TiO2 nanotubes. At the same time, it promotes the transfer of photogenerated electrons, increases the separation of photogenerated electrons and holes, and increases the utilization efficiency of visible light, thereby providing better cathodic protection for stainless steel and greatly improving its corrosion resistance.

[0041] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0042] Although the present invention has been described in detail and specific embodiments have been cited, it will be apparent to those skilled in the art that various changes or modifications can be made without departing from the spirit and scope of the invention.

Claims

1. A wheel frame, characterized in that, The wheel frame comprises a stainless steel substrate and a protective layer on the surface of the substrate. The composition and mass percentage content of the stainless steel substrate are as follows: 0.25-0.26% C, 0.58-0.65% Mn, 0.01-0.15% P, 0.1-0.15% Si, 5-5.5% Cr, 8-8.5% Ni, 0.2-0.23% Mo, with the balance being Fe and unavoidable trace elements. The protective layer is an aqueous coating containing Cu2O and TiO2; The preparation method of the wheel frame includes the following steps: Cu2O is added to TiO2 nanotube array for ultrasonic composite, and then dried and calcined to obtain Cu2O / TiO2 composite material. The Cu2O / TiO2 composite material is then placed in epoxy aqueous emulsion and stirred and dispersed to obtain aqueous coating. The aqueous coating is then uniformly coated on the surface of stainless steel wheel frame substrate, and finally dried to obtain stainless steel wheel frame. The mass ratio of TiO2 nanotube array to Cu2O solution is (10-15):1; The mass ratio of Cu2O / TiO2 composite material to epoxy aqueous emulsion is 1:(8-10). The preparation method of epoxy aqueous emulsion includes: mixing polyether alcohol diglycidyl ether and ethanolamine to obtain a reactant, and then adding urushiol epoxy resin to obtain epoxy aqueous emulsion.

2. A wheel frame according to claim 1, characterized in that, The drying and calcination temperature is 70-90℃.

3. A wheel frame according to claim 1, characterized in that, The molar ratio of polyether alcohol diglycidyl ether to ethanolamine is 1:(1-1.5).

4. A wheel frame according to claim 1, characterized in that, The molar ratio of reactants to urushiol epoxy resin is 1:(2-5).

5. A wheel frame according to claim 1, characterized in that, The drying process is carried out at a temperature of 45-55℃ for 20-30 hours.

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