A catering stove and its preparation method

Abstract

A cooking stove for the catering industry and its preparation method. After adding molybdenum metal to the traditional Al-Si coating in the present invention, its corrosion resistance and wear resistance can be further improved. With the increase of the amount of molybdenum metal, the corrosion resistance of the composite coating shows a trend of first increasing and then decreasing, while the wear resistance shows a trend of first increasing and then stabilizing. At the same time, molybdenum is an essential trace element for the human body, and using molybdenum metal to prepare the coating of the cooking stove for the catering industry will not cause any harm to human health.

Description

Technical Field

[0001] The present invention relates to the field of kitchen utensils, and particularly to a catering stove and a preparation method thereof. Background Art

[0002] Catering stoves, such as iron pans, are commonly used tools for stir-frying and stewing in daily life, and are also the most important and popular cooking utensils in China. They are in the same line of inheritance as the li, fu, and ding that appeared in the pre-Qin era. Since the Qing Dynasty, iron pans have been widely used in China to cook food, and the popularity has almost reached every household. However, being prone to rust and corrosion is a major drawback of iron pans. At the same time, the wear resistance of iron pans is also an important factor affecting their service life. In the prior art, someone prepared an Al-Si coating on the surface of an iron pan to optimize its performance. However, the corrosion resistance and wear resistance of this coating product still need to be improved. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a preparation method of a catering stove, which can obtain a catering stove with excellent corrosion resistance and wear resistance.

[0004] A preparation method of a catering stove includes the following steps:

[0005] Substrate pretreatment: Take an iron workpiece as the substrate, polish the substrate with sandpaper to remove the burrs on the surface, then pickling the substrate with hydrochloric acid with a concentration of 15-18% to remove the oxide layer on the surface, and then cleaning the substrate with a sodium hydroxide solution with a concentration of 18-20% to remove the grease on the surface, and then cleaning the substrate with deionized water and drying it under nitrogen for standby;

[0006] Prepare the coating solution: Take 100 parts by weight of metal aluminum powder, 13-29 parts by weight of metal molybdenum powder, 7.5-9.0 parts by weight of the dispersant tannic acid, 30-35 parts by weight of silica sol with a concentration of 60-62%, and 300-320 parts by weight of absolute ethanol, mix them and stir at a speed of 450-500 r / min for 30-45 min. After the solution system is mixed evenly, adjust the pH value to 4.3-4.5 with a regulator;

[0007] Prepare the Al-Mo-Si composite coating: Immerse the substrate in the coating solution, take it out, first keep it warm at 80-85°C for 15-20 min, and then cure it at 260-280°C for 1-1.5 h. By controlling the immersion time and immersion times, make the thickness of the composite coating 10-12 μm.

[0008] Preferably, the stove is an iron pan.

[0009] Preferably, the stirring speed is 500 r / min.

[0010] Preferably, the stirring time is 45 min.

[0011] Preferably, the pH value is 4.3.

[0012] Preferably, the curing temperature is 280 °C.

[0013] Preferably, the coating thickness is 10 μm.

[0014] Furthermore, the present invention also provides a cooking stove for the catering industry, which is prepared by the above method.

[0015] After adding metallic molybdenum to the traditional Al-Si coating, the present invention can further improve its corrosion resistance and wear resistance. With the increase of the amount of metallic molybdenum, the corrosion resistance of the composite coating shows a trend of first increasing and then decreasing, while the wear resistance shows a trend of first increasing and then stabilizing. At the same time, molybdenum is an essential trace element for the human body, and preparing the coating of the cooking stove for the catering industry with metallic molybdenum will not cause any harm to human health. Specific Embodiments

[0016] The technical effects of the present invention are verified through specific embodiments below, but the implementation manners of the present invention are not limited thereto.

[0017] Example 1

[0018] Substrate Pretreatment: Take an iron workpiece as the substrate, polish the substrate with sandpaper to remove the burrs on the surface, then pick hydrochloric acid with a concentration of 15% to pickle the substrate to remove the oxide layer on the surface, and then clean the substrate with a sodium hydroxide solution with a concentration of 18% to remove the grease on the surface, and then clean the substrate with deionized water and dry it under nitrogen for standby;

[0019] Prepare the Coating Solution: Take 100 parts by weight of metallic aluminum powder, 13 parts by weight of metallic molybdenum powder, 7.5 parts by weight of the dispersant tannic acid, 30 parts by weight of silica sol with a concentration of 60%, and 300 parts by weight of absolute ethanol, mix them and stir at a speed of 500 r / min for 30 min. After the solution system is mixed evenly, adjust the pH value to 4.3 with a regulator;

[0020] Prepare the Al-Mo-Si Composite Coating: Immerse the substrate in the coating solution, take it out, keep it warm at 80 °C for 15 min first, and then cure it at 280 °C for 1 h. By controlling the immersion time and immersion times, make the thickness of the composite coating about 10 μm.

[0021] Example 2

[0022] Substrate pretreatment: Take an iron workpiece as the substrate, polish the substrate with sandpaper to remove surface burrs. Then, pick hydrochloric acid with a concentration of 15% to pickle the substrate to remove the surface oxide layer. After that, clean the substrate with a sodium hydroxide solution with a concentration of 18% to remove surface grease. Then, clean the substrate with deionized water and dry it under nitrogen for standby;

[0023] Prepare the coating solution: Take 100 parts by weight of aluminum metal powder, 17 parts by weight of molybdenum metal powder, 7.5 parts by weight of the dispersant tannic acid, 30 parts by weight of silica sol with a concentration of 60%, and 300 parts by weight of absolute ethanol. Mix them and stir at a speed of 500 r / min for 30 min. After the solution system is evenly mixed, adjust the pH value to 4.3 with a regulator;

[0024] Prepare the Al-Mo-Si composite coating: Immerse the substrate in the coating solution, take it out and keep it at 80 °C for 15 min first, and then cure it at 280 °C for 1 h. By controlling the immersion time and number of immersions, make the thickness of the composite coating about 10 μm.

[0025] Example 3

[0026] Substrate pretreatment: Take an iron workpiece as the substrate, polish the substrate with sandpaper to remove surface burrs. Then, pick hydrochloric acid with a concentration of 15% to pickle the substrate to remove the surface oxide layer. After that, clean the substrate with a sodium hydroxide solution with a concentration of 18% to remove surface grease. Then, clean the substrate with deionized water and dry it under nitrogen for standby;

[0027] Prepare the coating solution: Take 100 parts by weight of aluminum metal powder, 20.6 parts by weight of molybdenum metal powder, 7.5 parts by weight of the dispersant tannic acid, 30 parts by weight of silica sol with a concentration of 60%, and 300 parts by weight of absolute ethanol. Mix them and stir at a speed of 500 r / min for 30 min. After the solution system is evenly mixed, adjust the pH value to 4.3 with a regulator;

[0028] Prepare the Al-Mo-Si composite coating: Immerse the substrate in the coating solution, take it out and keep it at 80 °C for 15 min first, and then cure it at 280 °C for 1 h. By controlling the immersion time and number of immersions, make the thickness of the composite coating about 10 μm.

[0029] Example 4

[0030] Substrate pretreatment: Take an iron workpiece as the substrate, polish the substrate with sandpaper to remove surface burrs. Then, pick hydrochloric acid with a concentration of 15% to pickle the substrate to remove the surface oxide layer. After that, clean the substrate with a sodium hydroxide solution with a concentration of 18% to remove surface grease. Then, clean the substrate with deionized water and dry it under nitrogen for standby;

[0031] Prepare the coating solution: Take 100 parts by weight of aluminum metal powder, 25 parts by weight of molybdenum metal powder, 7.5 parts by weight of the dispersant tannic acid, 30 parts by weight of silica sol with a concentration of 60%, and 300 parts by weight of absolute ethanol. Mix them and stir at a speed of 500 r / min for 30 min. After the solution system is mixed evenly, adjust the pH value to 4.3 with a regulator.

[0032] Prepare the Al-Mo-Si composite coating: Immerse the substrate in the coating solution, take it out, keep it warm at 80 °C for 15 min first, and then cure it at 280 °C for 1 h. By controlling the immersion time and the number of immersions, make the thickness of the composite coating about 10 μm.

[0033] Example 5

[0034] Substrate pretreatment: Take an iron workpiece as the substrate, polish the substrate with sandpaper to remove the burrs on the surface. Then, select hydrochloric acid with a concentration of 15% to pickle the substrate to remove the oxide layer on the surface. Then, clean the substrate with a sodium hydroxide solution with a concentration of 18% to remove the grease on the surface. Then, clean the substrate with deionized water and dry it under nitrogen for standby.

[0035] Prepare the coating solution: Take 100 parts by weight of aluminum metal powder, 29 parts by weight of molybdenum metal powder, 7.5 parts by weight of the dispersant tannic acid, 30 parts by weight of silica sol with a concentration of 60%, and 300 parts by weight of absolute ethanol. Mix them and stir at a speed of 500 r / min for 30 min. After the solution system is mixed evenly, adjust the pH value to 4.3 with a regulator.

[0036] Prepare the Al-Mo-Si composite coating: Immerse the substrate in the coating solution, take it out, keep it warm at 80 °C for 15 min first, and then cure it at 280 °C for 1 h. By controlling the immersion time and the number of immersions, make the thickness of the composite coating about 10 μm.

[0037] Comparative Example 1

[0038] Substrate pretreatment: Take an iron workpiece as the substrate, polish the substrate with sandpaper to remove the burrs on the surface. Then, select hydrochloric acid with a concentration of 15% to pickle the substrate to remove the oxide layer on the surface. Then, clean the substrate with a sodium hydroxide solution with a concentration of 18% to remove the grease on the surface. Then, clean the substrate with deionized water and dry it under nitrogen for standby.

[0039] Prepare the coating solution: Take 100 parts by weight of aluminum metal powder, 50 parts by weight of molybdenum metal powder, 7.5 parts by weight of the dispersant tannic acid, 30 parts by weight of silica sol with a concentration of 60%, and 300 parts by weight of absolute ethanol. Mix them and stir at a speed of 500 r / min for 30 min. After the solution system is mixed evenly, adjust the pH value to 4.3 with a regulator.

[0040] Preparation of Al-Mo-Si composite coating: The substrate was immersed in the coating solution, taken out, kept at 80 °C for 15 min first, and then cured at 280 °C for 1 h. By controlling the immersion time and number of immersions, the thickness of the composite coating was about 10 μm.

[0041] Comparative Example 2

[0042] Substrate pretreatment: An iron workpiece was taken as the substrate and polished with sandpaper to remove surface burrs. Then, the substrate was pickled with 15% hydrochloric acid to remove the surface oxide layer, and then cleaned with 18% sodium hydroxide solution to remove surface grease. The substrate was further cleaned with deionized water and dried under nitrogen for standby;

[0043] Preparation of coating solution: 100 parts by weight of metal aluminum powder, 7.5 parts by weight of dispersant tannic acid, 30 parts by weight of 60% silica sol, and 300 parts by weight of absolute ethanol were mixed and stirred at a speed of 500 r / min for 30 min. After the solution system was mixed evenly, the pH value was adjusted to 4.3 with a regulator;

[0044] Preparation of Al-Si composite coating: The substrate was immersed in the coating solution, taken out, kept at 80 °C for 15 min first, and then cured at 280 °C for 1 h. By controlling the immersion time and number of immersions, the thickness of the composite coating was about 10 μm.

[0045] Next, we evaluated the corrosion resistance and wear resistance of the samples in Examples 1-5 and Comparative Examples 1-2. The specific method was as follows:

[0046] Corrosion resistance: Electrochemical tests were performed on each sample in 4% NaCl using an electrochemical workstation at room temperature.

[0047] Wear resistance: The wear resistance of each sample was evaluated using a CETR-3 type friction and wear tester with a load of 5 N, a friction pair of GCr15 steel balls with a diameter of 5 mm, a friction frequency of 8 Hz, a friction stroke of 3 mm, and a friction time of 60 min. The mass before and after wear was weighed with an electronic balance to calculate the wear amount.

[0048] The test results are shown in Table 1:

[0049] Table 1

[0050] Number <![CDATA[Self-corrosion current density / A·cm -2 > Wear amount / mg Example 1 <![CDATA[5.39×10 -7 > 7.3 Example 2 <![CDATA[2.12×10 -7 > 5.1 Example 3 <![CDATA[9.50×10 -8 > 3.9 Example 4 <![CDATA[6.17×10 -7 > 3.8 Example 5 <![CDATA[8.58×10 -7 > 3.6 Comparative Example 1 <![CDATA[9.69×10 -6 > 3.5 Comparative Example 2 <![CDATA[8.63×10 -6 > 11.7

[0051] As can be seen from Table 1, adding molybdenum metal to the traditional Al-Si coating can further improve its corrosion resistance and wear resistance. With the increase in the amount of molybdenum metal, the corrosion resistance of the composite coating shows a trend of first increasing and then decreasing, while the wear resistance shows a trend of first increasing and then stabilizing. Considering the coating performance and the manufacturing cost of the product comprehensively, Example 3 belongs to the most preferred technical solution.

[0052] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A preparation method of a cooking stove for the catering industry, characterized in that, The preparation method includes the following steps: Substrate pretreatment: Take an iron workpiece as the substrate, polish the substrate with sandpaper to remove burrs on the surface, then pick hydrochloric acid with a concentration of 15 - 18% to pickle the substrate to remove the oxide layer on the surface, and then clean the substrate with a sodium hydroxide solution with a concentration of 18 - 20% to remove the grease on the surface. Next, wash the substrate with deionized water and dry it under nitrogen for standby; Prepare the coating solution: Take 100 parts by weight of metal aluminum powder, 17 - 29 parts by weight of metal molybdenum powder, 7.5 - 9.0 parts by weight of the dispersant tannic acid, 30 - 35 parts by weight of silica sol with a concentration of 60 - 62%, and 300 - 320 parts by weight of absolute ethanol. Mix them and stir at a speed of 450 - 500 r / min for 30 - 45 min. After the solution system is mixed evenly, adjust the pH value to 4.3 - 4.5 with a regulator; Prepare the Al - Mo - Si composite coating: Immerse the substrate in the coating solution, take it out and first keep it warm at 80 - 85 °C for 15 - 20 min, then cure it at 260 - 280 °C for 1 - 1.5 h. By controlling the immersion time and the number of immersions, make the thickness of the composite coating 10 - 12 μm.

2. A preparation method as described in claim 1, characterized in that, The cooking utensil is an iron pan.

3. A preparation method as described in claim 1, characterized in that, The stirring speed is 500 r / min.

4. A preparation method as described in claim 1, characterized in that, The stirring time is 45 min.

5. A preparation method as described in claim 1, characterized in that, The pH value is 4.

3.

6. A preparation method as described in claim 1, characterized in that, The curing temperature is 280 °C.

7. A preparation method as described in claim 1, characterized in that, The coating thickness is 10 μm.

8. A cooking stove for the catering industry, characterized in that, The cooking utensil for the catering industry is prepared by the method described in any one of claims 1 - 7.