Method for steam bluing of non-oriented silicon steel

Abstract

The application discloses a non-oriented silicon steel steam bluing method, and belongs to the technical field of metal surface modification, and comprises the following steps: S1: non-oriented silicon steel treatment; S2: non-oriented silicon steel pickling activation; S3: blow drying; S4: assembling a steam bluing device; S5: non-oriented silicon steel preheating, reaching a set temperature, and passing in water vapor; the heated non-oriented silicon steel is subjected to bluing in the water vapor environment; after the bluing is completed, cooling to room temperature; and the non-oriented silicon steel completes steam bluing; the non-oriented silicon steel is heated by a high-frequency induction heating coil; compared with the prior art, the heating rate of the non-oriented silicon steel can be accelerated, the efficiency of steam bluing of the non-oriented silicon steel is accelerated, the steam bluing time of the non-oriented silicon steel is shortened, cost loss is reduced, and the steam bluing effect is good.

Description

A method for steam bluing non-oriented silicon steel Technical Field

[0001] This invention belongs to the field of metal surface modification technology, specifically relating to a method for steam bluing of non-oriented silicon steel. Background Technology

[0002] Non-oriented silicon steel, composed of silicon and iron, has excellent electromagnetic properties and is an important energy-saving functional metal material. It is mainly used as the core of various electric motors and small transformers.

[0003] Reducing the iron loss of non-oriented silicon steel is one of the important ways to improve the efficiency of motors and small transformers to save energy. At present, the common way to reduce the iron loss of non-oriented silicon steel is to coat the surface of non-oriented silicon steel with an insulating coating to increase the surface resistance of non-oriented silicon steel and at the same time isolate external pollutants to increase the corrosion resistance of non-oriented silicon steel.

[0004] Steam bluing is an economical, convenient, and simple method for coating an insulating coating onto the surface of non-oriented silicon steel. Currently, the general method for steam bluing non-oriented silicon steel involves placing the steel in a steam bluing furnace, heating it to a specific temperature, and then introducing steam to generate a thin film of magnetic iron oxide on the surface. Although the magnetic iron oxide film generated by the above steam bluing method has strong adhesion, good insulation, and excellent corrosion resistance, the heating efficiency of the steam bluing furnace is slow, the preparation process is time-consuming, and the cost is high. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides a method for steam bluing of non-oriented silicon steel. This method accelerates the heating rate of the non-oriented silicon steel, thereby increasing the efficiency of steam bluing, reducing the steam bluing time, lowering cost, and achieving good steam bluing results.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for steam bluing of non-oriented silicon steel, comprising the following steps:

[0007] S1: Use sandpaper to sand the non-oriented silicon steel until it is smooth. Use a polishing instrument to polish the non-oriented silicon steel until it is mirror-like. Place the polished non-oriented silicon steel in an alkaline solution for a first cleaning. Place the non-oriented silicon steel in deionized water for a second cleaning to remove the oil stains.

[0008] S2: Place the non-oriented silicon steel after the second cleaning in the pickling solution for pickling and activation, place the activated non-oriented silicon steel in deionized water for a first ultrasonic cleaning, and place the non-oriented silicon steel after the first cleaning in an ethanol solution for a second ultrasonic cleaning to remove the pickling solution from the surface of the non-oriented silicon steel.

[0009] S3: Place the ultrasonically cleaned non-oriented silicon steel in a drying instrument to dry it;

[0010] S4: Place the distillation flask in a constant temperature heating pot, add 2 / 3 of the deionized water to the distillation flask, place the special high temperature resistant quartz glass tube in the mouth of the distillation flask, put the high frequency induction heating coil around the special high temperature resistant quartz glass tube, and place the water vapor condensation reflux tube above the special high temperature resistant quartz glass tube. The water vapor inlet and outlet of the water vapor condensation reflux tube are in the high frequency induction heating coil.

[0011] S5: Place the air-dried non-oriented silicon steel in a special high-temperature resistant quartz glass tube, start the high-frequency induction heating coil, and preheat the non-oriented silicon steel until it reaches the set temperature. Then start the constant temperature heating pot, which heats the deionized water in the distillation flask. The generated steam enters the special high-temperature resistant quartz glass tube, and the heated non-oriented silicon steel undergoes bluing in the steam environment. After bluing, cool it to room temperature. The non-oriented silicon steel has completed steam bluing.

[0012] Furthermore, in step S2, the pickling solution is a mixture of sulfuric acid solution and thiourea solution, wherein the concentration of sulfuric acid solution is 0.2 mol / L, the concentration of thiourea solution is 2 g / L, and the pickling time is 60 s.

[0013] Furthermore, in step S2, the ultrasonic cleaning time is 60 seconds.

[0014] Furthermore, in step S5, the set temperature of the non-oriented silicon steel is 480°C.

[0015] Furthermore, in step S5, the heated non-oriented silicon steel is bluing at a temperature of 540°C in a water vapor environment for 20-30 minutes.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This invention uses a high-frequency induction heating coil to heat non-oriented silicon steel. Compared with the prior art, it can accelerate the heating rate of non-oriented silicon steel, that is, speed up the efficiency of steam bluing of non-oriented silicon steel, reduce the steam bluing time of non-oriented silicon steel, reduce cost losses, and at the same time, the steam bluing effect is good. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the method for steam bluing non-oriented silicon steel according to the present invention;

[0019] In the diagram: 1. Water vapor condensation reflux tube; 2. High-frequency induction heating coil; 3. Distillation flask; 4. Constant temperature heating pot; 5. Special high-temperature resistant quartz glass tube. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1

[0022] Please refer to Figure 1. The present invention provides the following technical solution: a method for steam bluing of non-oriented silicon steel, comprising the following steps:

[0023] S1: Use 2000# sandpaper to polish the non-oriented silicon steel until it is smooth. Apply 3μm and 1μm polishing paste to the non-oriented silicon steel with a polishing instrument and polish until it becomes mirror-like. Clean the polished non-oriented silicon steel in an alkaline solution once, and then clean it a second time in deionized water to remove oil stains.

[0024] S2: The non-oriented silicon steel after the second cleaning is placed in the pickling solution for 60 seconds for pickling activation. The activated non-oriented silicon steel is placed in deionized water and ultrasonically cleaned for 60 seconds. The non-oriented silicon steel after the first cleaning is placed in ethanol solution and ultrasonically cleaned for 60 seconds to remove the pickling solution from the surface of the non-oriented silicon steel. The pickling solution is a mixed solution of sulfuric acid solution and thiourea solution, with a sulfuric acid solution concentration of 0.2 mol / L and a thiourea solution concentration of 2 g / L.

[0025] S3: Place the ultrasonically cleaned non-oriented silicon steel in a drying instrument to dry it;

[0026] S4: Place the distillation flask in a constant temperature heating pot, add 2 / 3 of the deionized water to the distillation flask, place the special high temperature resistant quartz glass tube in the mouth of the distillation flask, put the high frequency induction heating coil around the special high temperature resistant quartz glass tube, and place the water vapor condensation reflux tube above the special high temperature resistant quartz glass tube. The water vapor inlet and outlet of the water vapor condensation reflux tube are in the high frequency induction heating coil.

[0027] S5: Place the air-dried non-oriented silicon steel in a special high-temperature resistant quartz glass tube, start the high-frequency induction heating coil, and preheat the non-oriented silicon steel using a thermocouple until it reaches 480°C. Then, start the constant temperature heating pot to heat the deionized water in the distillation flask. The generated steam enters the special high-temperature resistant quartz glass tube, and the high-frequency induction heating coil heats the tube until the temperature reaches 540°C. The heated non-oriented silicon steel will turn blue in the steam environment for 10 minutes. After the blueing is complete, cool it to room temperature. The steam blueing of the non-oriented silicon steel is now complete.

[0028] Example 2

[0029] Please refer to Figure 1. The present invention provides the following technical solution: a method for steam bluing of non-oriented silicon steel, comprising the following steps:

[0030] S1: Use 2000# sandpaper to polish the non-oriented silicon steel until it is smooth. Apply 3μm and 1μm polishing paste to the non-oriented silicon steel with a polishing instrument and polish until it becomes mirror-like. Clean the polished non-oriented silicon steel in an alkaline solution once, and then clean it a second time in deionized water to remove oil stains.

[0031] S2: The non-oriented silicon steel after the second cleaning is placed in the pickling solution for 60 seconds for pickling activation. The activated non-oriented silicon steel is placed in deionized water and ultrasonically cleaned for 60 seconds. The non-oriented silicon steel after the first cleaning is placed in ethanol solution and ultrasonically cleaned for 60 seconds to remove the pickling solution from the surface of the non-oriented silicon steel. The pickling solution is a mixed solution of sulfuric acid solution and thiourea solution, with a sulfuric acid solution concentration of 0.2 mol / L and a thiourea solution concentration of 2 g / L.

[0032] S3: Place the ultrasonically cleaned non-oriented silicon steel in a drying instrument to dry it;

[0033] S4: Place the distillation flask in a constant temperature heating pot, add 2 / 3 of the deionized water to the distillation flask, place the special high temperature resistant quartz glass tube in the mouth of the distillation flask, put the high frequency induction heating coil around the special high temperature resistant quartz glass tube, and place the water vapor condensation reflux tube above the special high temperature resistant quartz glass tube. The water vapor inlet and outlet of the water vapor condensation reflux tube are in the high frequency induction heating coil.

[0034] S5: Place the air-dried non-oriented silicon steel in a special high-temperature resistant quartz glass tube, start the high-frequency induction heating coil, and preheat the non-oriented silicon steel until it reaches 480°C. Then start the constant temperature heating pot, which heats the deionized water in the distillation flask. The generated steam enters the special high-temperature resistant quartz glass tube, and the high-frequency induction heating coil heats the special high-temperature resistant quartz glass tube until the temperature inside reaches 540°C. The heated non-oriented silicon steel will turn blue in the steam environment for 20 minutes. After the blueing is complete, cool it to room temperature. The non-oriented silicon steel has completed the steam blueing process.

[0035] Example 3

[0036] Please refer to Figure 1. The present invention provides the following technical solution: a method for steam bluing of non-oriented silicon steel, comprising the following steps:

[0037] S1: Use 2000# sandpaper to polish the non-oriented silicon steel until it is smooth. Apply 3μm and 1μm polishing paste to the non-oriented silicon steel with a polishing instrument and polish until it becomes mirror-like. Clean the polished non-oriented silicon steel in an alkaline solution once, and then clean it a second time in deionized water to remove oil stains.

[0038] S2: The non-oriented silicon steel after the second cleaning is placed in the pickling solution for 60 seconds for pickling activation. The activated non-oriented silicon steel is placed in deionized water and ultrasonically cleaned for 60 seconds. The non-oriented silicon steel after the first cleaning is placed in ethanol solution and ultrasonically cleaned for 60 seconds to remove the pickling solution from the surface of the non-oriented silicon steel. The pickling solution is a mixed solution of sulfuric acid solution and thiourea solution, with a sulfuric acid solution concentration of 0.2 mol / L and a thiourea solution concentration of 2 g / L.

[0039] S3: Place the ultrasonically cleaned non-oriented silicon steel in a drying instrument to dry it;

[0040] S4: Place the distillation flask in a constant temperature heating pot, add 2 / 3 of the deionized water to the distillation flask, place the special high temperature resistant quartz glass tube in the mouth of the distillation flask, put the high frequency induction heating coil around the special high temperature resistant quartz glass tube, and place the water vapor condensation reflux tube above the special high temperature resistant quartz glass tube. The water vapor inlet and outlet of the water vapor condensation reflux tube are in the high frequency induction heating coil.

[0041] S5: Place the air-dried non-oriented silicon steel in a special high-temperature resistant quartz glass tube, start the high-frequency induction heating coil, and preheat the non-oriented silicon steel until it reaches 480°C. Then start the constant temperature heating pot, which heats the deionized water in the distillation flask. The generated steam enters the special high-temperature resistant quartz glass tube, and the high-frequency induction heating coil heats the special high-temperature resistant quartz glass tube until the temperature inside reaches 540°C. The heated non-oriented silicon steel will turn blue in the steam environment for 30 minutes. After the blueing is complete, cool it to room temperature. The non-oriented silicon steel has completed the steam blueing process.

[0042] Example 4

[0043] Please refer to Figure 1. The present invention provides the following technical solution: a method for steam bluing of non-oriented silicon steel, comprising the following steps:

[0044] S1: Use 2000# sandpaper to polish the non-oriented silicon steel until it is smooth. Apply 3μm and 1μm polishing paste to the non-oriented silicon steel with a polishing instrument and polish until it becomes mirror-like. Clean the polished non-oriented silicon steel in an alkaline solution once, and then clean it a second time in deionized water to remove oil stains.

[0045] S2: The non-oriented silicon steel after the second cleaning is placed in the pickling solution for 60 seconds for pickling activation. The activated non-oriented silicon steel is placed in deionized water and ultrasonically cleaned for 60 seconds. The non-oriented silicon steel after the first cleaning is placed in ethanol solution and ultrasonically cleaned for 60 seconds to remove the pickling solution from the surface of the non-oriented silicon steel. The pickling solution is a mixed solution of sulfuric acid solution and thiourea solution, with a sulfuric acid solution concentration of 0.2 mol / L and a thiourea solution concentration of 2 g / L.

[0046] S3: Place the ultrasonically cleaned non-oriented silicon steel in a drying instrument to dry it;

[0047] S4: Place the distillation flask in a constant temperature heating pot, add 2 / 3 of the deionized water to the distillation flask, place the special high temperature resistant quartz glass tube in the mouth of the distillation flask, put the high frequency induction heating coil around the special high temperature resistant quartz glass tube, and place the water vapor condensation reflux tube above the special high temperature resistant quartz glass tube. The water vapor inlet and outlet of the water vapor condensation reflux tube are in the high frequency induction heating coil.

[0048] S5: Place the air-dried non-oriented silicon steel in a special high-temperature resistant quartz glass tube, start the high-frequency induction heating coil, and preheat the non-oriented silicon steel until it reaches 480°C. Then start the constant temperature heating pot, which heats the deionized water in the distillation flask. The generated steam enters the special high-temperature resistant quartz glass tube, and the high-frequency induction heating coil heats the special high-temperature resistant quartz glass tube until the temperature inside reaches 540°C. The heated non-oriented silicon steel will turn blue in the steam environment for 40 minutes. After the blueing is complete, cool it to room temperature. The non-oriented silicon steel has completed the steam blueing process.

[0049] Table 1 shows the performance tests in the examples.

[0050]

[0051] As shown in Table 1, the bluing temperature determines the quality of the oxide film. The bluing effect is best when the bluing temperature is controlled within 530-550℃. The bluing time affects the thickness of the oxide film. The oxide film effect is best when the bluing time is controlled within 20-30 min. The final oxide film thickness is in the range of 15-25 μm.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for steam bluing non-oriented silicon steel, characterized in that, Includes the following steps: S1: Sand the non-oriented silicon steel with sandpaper until it becomes smooth. Polish the non-oriented silicon steel with a polishing instrument until it reaches a mirror finish. Clean the polished non-oriented silicon steel once in an alkaline solution, then clean it a second time in deionized water. S2: After the second cleaning, acid-wash the non-oriented silicon steel in an acid pickling solution for activation. Clean the activated non-oriented silicon steel once in deionized water using ultrasonic cleaning, then clean it a second time in an ethanol solution using ultrasonic cleaning. S3: After ultrasonic cleaning, dry the non-oriented silicon steel in an air-drying instrument. S4: Place a distillation flask in a constant temperature heating pot, add 2 / 3 deionized water to the distillation flask, and add the special high-temperature resistant stone... A high-temperature resistant quartz glass tube is placed in the mouth of a distillation flask. A high-frequency induction heating coil is placed around the outside of the high-temperature resistant quartz glass tube. A water vapor condensation reflux tube is placed above the high-temperature resistant quartz glass tube, with the water vapor inlet and outlet of the water vapor condensation reflux tube in the high-frequency induction heating coil. S5: The air-dried non-oriented silicon steel is placed in the high-temperature resistant quartz glass tube. The high-frequency induction heating coil is activated to preheat the non-oriented silicon steel until it reaches the set temperature. The constant temperature heating pot is then activated to heat the deionized water in the distillation flask. The generated steam enters the high-temperature resistant quartz glass tube. The heated non-oriented silicon steel undergoes bluing in the steam environment. After bluing, it is cooled to room temperature, and the non-oriented silicon steel completes the steam bluing process.

2. The method for steam bluing of non-oriented silicon steel according to claim 1, characterized in that: In step S2, the pickling solution is a mixture of sulfuric acid solution and thiourea solution, wherein the concentration of sulfuric acid solution is 0.2 mol / L, the concentration of thiourea solution is 2 g / L, and the pickling time is 60 s.

3. The method for steam bluing non-oriented silicon steel according to claim 1, characterized in that: In step S2, the ultrasonic cleaning time is 60 seconds.

4. The method for steam bluing of non-oriented silicon steel according to claim 1, characterized in that: In step S5, the set temperature for the non-oriented silicon steel is 480°C.

5. The method for steam bluing non-oriented silicon steel according to claim 1, characterized in that: In step S5, the heated non-oriented silicon steel is bluing at a temperature of 540°C in a water vapor environment for 20-30 minutes.

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