Method for detecting thickness of insulating coating of electrical steel

Abstract

The invention discloses a method for detecting the thickness of an insulating coating of electrical steel, which comprises the following steps: a protective layer is coated on the insulating coating of the electrical steel, the protective layer and the insulating coating do not generate chemical reaction, the integrity of the coating is not damaged, and the protective layer and the coating are tightly combined and have obvious difference for subsequent observation; cutting the electrical steel coated with the protective layer to prepare a sample; carrying out embedding treatment on the prepared sample; carrying out grinding and polishing treatment on the embedded sample to expose an interface of the insulating coating and the protective layer; the thickness of the insulating coating is observed and measured under an optical microscope or a scanning electron microscope, the protective layer ensures that the coating is kept complete in the observation process, and the accuracy and reliability of measurement are improved. According to the technology, the idea that the protective layer wraps the protective coating is adopted, the electrical steel coating can be effectively protected, follow-up detection and analysis are facilitated, and the protective layer material is easy to obtain, low in cost and excellent in effect.

Description

Technical Field

[0001] The invention relates to the technical field of electrical steel material detection, and in particular to a method for detecting the thickness of an electrical steel insulating coating. Background Art

[0002] As an important soft magnetic material, electrical steel is widely used in power equipment such as transformers and motors. In order to effectively limit eddy current losses, the surface of finished electrical steel products is usually coated with a corrosion-resistant insulating coating. However, the coating is very thin, approximately between 0.5-3μm, and is prone to powdering or even falling off under certain conditions. In the prior art, the method for detecting the thickness of electrical steel corrosion-resistant insulating coatings usually involves cutting samples, mounting samples, grinding and polishing samples, and observing and measuring the coating under an optical microscope or scanning electron microscope. However, due to the thin thickness of the coating and its easy fall-off, it is difficult to obtain a cross-sectional image of the intact coating using the existing method, resulting in significant deviations in measuring the coating thickness, or even inability to accurately measure it. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned background technical problems and to provide a method for detecting the thickness of the insulating coating of electrical steel.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for detecting the thickness of an insulating coating of electrical steel comprises the following steps:

[0006] S1. A protective layer is applied on the insulating coating of the electrical steel, wherein the protective layer does not chemically react with the insulating coating, does not damage the integrity of the coating, and is closely combined with the coating and has obvious differences to facilitate subsequent observation;

[0007] S2. Cutting the electrical steel coated with the protective layer to prepare a sample;

[0008] S3, performing inlay processing on the prepared sample;

[0009] S4, grinding and polishing the mounted sample to expose the interface between the insulating coating and the protective layer;

[0010] S5. Observe and measure the thickness of the insulating coating under an optical microscope or a scanning electron microscope. The protective layer ensures that the coating remains intact during the observation process, thereby improving the accuracy and reliability of the measurement.

[0011] As a further solution of the present invention: for the insulating coating that is not resistant to high temperatures, a protective layer is formed by spraying colored paint.

[0012] As a further solution of the present invention: for the high temperature resistant insulating coating, a method of spraying colored paint is selected to form a protective layer.

[0013] As a further solution of the present invention: For the high temperature resistant insulating coating, hot dip tinning can also be selected. After the tin is heated and melted, the coated electrical steel is immersed in the tin solution to form a dense protective layer outside the electrical steel coating.

[0014] As a further solution of the present invention: For the high temperature resistant insulating coating, hot-dip aluminum can also be selected. After the aluminum is heated and melted, the coated electrical steel is immersed in the aluminum solution to form a dense protective layer on the outside of the electrical steel coating.

[0015] As a further solution of the present invention: For the high temperature resistant insulating coating, hot dip galvanizing can also be selected. After the zinc is heated and melted, the coated electrical steel is immersed in a zinc solution to form a dense protective layer outside the electrical steel coating.

[0016] Beneficial effects of the invention: This technology uses the concept of wrapping the protective coating with a protective layer, which can effectively protect the electrical steel coating to facilitate subsequent detection and analysis, and the protective layer material is easy to obtain, low cost, and has excellent effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] For example, see Figure 1 As shown, the present invention is a method for detecting the thickness of an insulating coating of electrical steel, characterized in that it comprises the following steps:

[0021] S1. A protective layer is applied on the insulating coating of the electrical steel, wherein the protective layer does not chemically react with the insulating coating, does not damage the integrity of the coating, and is closely combined with the coating and has obvious differences to facilitate subsequent observation;

[0022] S2. Cutting the electrical steel coated with the protective layer to prepare a sample;

[0023] S3, performing inlay processing on the prepared sample;

[0024] S4, grinding and polishing the mounted sample to expose the interface between the insulating coating and the protective layer;

[0025] S5. Observe and measure the thickness of the insulating coating under an optical microscope or a scanning electron microscope. The protective layer ensures that the coating remains intact during the observation process, thereby improving the accuracy and reliability of the measurement.

[0026] For example 2, please refer to Figure 1 As shown, the present invention is a method for detecting the thickness of an insulating coating of electrical steel, characterized in that it comprises the following steps:

[0027] S1. A protective layer is applied on the insulating coating of the electrical steel. The protective layer does not chemically react with the insulating coating, does not damage the integrity of the coating, and is closely combined with the coating and has obvious differences for subsequent observation; for insulating coatings that are not resistant to high temperatures, a protective layer is formed by spraying colored paint;

[0028] S2. Cutting the electrical steel coated with the protective layer to prepare a sample;

[0029] S3, performing inlay processing on the prepared sample;

[0030] S4, grinding and polishing the mounted sample to expose the interface between the insulating coating and the protective layer;

[0031] S5. Observe and measure the thickness of the insulating coating under an optical microscope or a scanning electron microscope. The protective layer ensures that the coating remains intact during the observation process, thereby improving the accuracy and reliability of the measurement.

[0032] For example 3, please refer to Figure 1 As shown, the present invention is a method for detecting the thickness of an insulating coating of electrical steel, characterized in that it comprises the following steps:

[0033] S1. A protective layer is applied on the insulating coating of the electrical steel. The protective layer does not chemically react with the insulating coating, does not damage the integrity of the coating, and is closely combined with the coating and has obvious differences for subsequent observation; for the high temperature resistant insulating coating, a method of spraying colored paint is selected to form the protective layer;

[0034] S2. Cutting the electrical steel coated with the protective layer to prepare a sample;

[0035] S3, performing inlay processing on the prepared sample;

[0036] S4, grinding and polishing the mounted sample to expose the interface between the insulating coating and the protective layer;

[0037] S5. Observe and measure the thickness of the insulating coating under an optical microscope or a scanning electron microscope. The protective layer ensures that the coating remains intact during the observation process, thereby improving the accuracy and reliability of the measurement.

[0038] Example 4, please refer to Figure 1 As shown, the present invention is a method for detecting the thickness of an insulating coating of electrical steel, characterized in that it comprises the following steps:

[0039] S1. A protective layer is coated on the insulating coating of the electrical steel. The protective layer does not chemically react with the insulating coating, does not destroy the integrity of the coating, and is closely combined with the coating and has obvious differences to facilitate subsequent observation. For high-temperature resistant insulating coatings, hot-dip tinning can also be selected. After the tin is heated and melted, the coated electrical steel is immersed in a tin solution to form a dense protective layer on the outside of the electrical steel coating.

[0040] S2. Cutting the electrical steel coated with the protective layer to prepare a sample;

[0041] S3, performing inlay processing on the prepared sample;

[0042] S4, grinding and polishing the mounted sample to expose the interface between the insulating coating and the protective layer;

[0043] S5. Observe and measure the thickness of the insulating coating under an optical microscope or a scanning electron microscope. The protective layer ensures that the coating remains intact during the observation process, thereby improving the accuracy and reliability of the measurement.

[0044] For example 5, please refer to Figure 1 As shown, the present invention is a method for detecting the thickness of an insulating coating of electrical steel, characterized in that it comprises the following steps:

[0045] S1. A protective layer is applied on the insulating coating of the electrical steel. The protective layer does not chemically react with the insulating coating, does not destroy the integrity of the coating, and is closely combined with the coating and has obvious differences for subsequent observation. For high-temperature resistant insulating coatings, hot-dip aluminum can also be selected. After the aluminum is heated and melted, the coated electrical steel is immersed in an aluminum solution to form a dense protective layer on the outside of the electrical steel coating.

[0046] S2. Cutting the electrical steel coated with the protective layer to prepare a sample;

[0047] S3, performing inlay processing on the prepared sample;

[0048] S4, grinding and polishing the mounted sample to expose the interface between the insulating coating and the protective layer;

[0049] S5. Observe and measure the thickness of the insulating coating under an optical microscope or a scanning electron microscope. The protective layer ensures that the coating remains intact during the observation process, thereby improving the accuracy and reliability of the measurement.

[0050] Example 6, please refer to Figure 1 As shown, the present invention is a method for detecting the thickness of an insulating coating of electrical steel, characterized in that it comprises the following steps:

[0051] S1. A protective layer is applied on the insulating coating of the electrical steel. The protective layer does not chemically react with the insulating coating, does not destroy the integrity of the coating, and is closely combined with the coating and has obvious differences to facilitate subsequent observation. For high-temperature resistant insulating coatings, hot-dip galvanizing can also be selected. After the zinc is heated and melted, the coated electrical steel is immersed in a zinc solution to form a dense protective layer on the outside of the electrical steel coating.

[0052] S2. Cutting the electrical steel coated with the protective layer to prepare a sample;

[0053] S3, performing inlay processing on the prepared sample;

[0054] S4, grinding and polishing the mounted sample to expose the interface between the insulating coating and the protective layer;

[0055] S5. Observe and measure the thickness of the insulating coating under an optical microscope or a scanning electron microscope. The protective layer ensures that the coating remains intact during the observation process, thereby improving the accuracy and reliability of the measurement.

[0056] It is also necessary to add that:

[0057] The protective layer materials of this technology are not limited to paints and low-melting-point metals. Various materials that do not destroy the integrity of the insulating coating of electrical steel, do not chemically react with the insulating coating, and materials that are tightly bonded to the insulating coating after coating can all be used as protective layer materials.

[0058] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A method for detecting the thickness of an insulating coating of electrical steel, characterized in that: The following steps are involved: S1. Apply a protective layer on the insulating coating of electrical steel; S2. Cutting the electrical steel coated with the protective layer to prepare a sample; S3, performing inlay processing on the prepared sample; S4, grinding and polishing the mounted sample to expose the interface between the insulating coating and the protective layer; S5. Observe and measure the thickness of the insulating coating under an optical microscope or a scanning electron microscope.

2. A method for detecting the thickness of the insulating coating of electrical steel according to claim 1, characterized in that: For insulating coatings that are not resistant to high temperatures, a protective layer is formed by spraying colored paint.

3. The method for detecting the thickness of the insulating coating of electrical steel according to claim 1, characterized in that: For high temperature resistant insulating coating, the method of spraying colored paint is selected to form a protective layer.

4. A method for detecting the thickness of an insulating coating of electrical steel according to claim 1, characterized in that: For high temperature resistant insulating coating, hot dip tinning can also be selected. After the tin is heated and melted, the coated electrical steel is immersed in the tin solution to form a dense protective layer on the outside of the electrical steel coating.

5. The method for detecting the thickness of the insulating coating of electrical steel according to claim 1, characterized in that: For high-temperature resistant insulating coatings, hot-dip aluminum can also be selected. After the aluminum is heated and melted, the coated electrical steel is immersed in the aluminum solution to form a dense protective layer on the outside of the electrical steel coating.

6. A method for detecting the thickness of an insulating coating of electrical steel according to claim 1, characterized in that: For high temperature resistant insulating coating, hot dip galvanizing can also be selected. After the zinc is heated and melted, the coated electrical steel is immersed in the zinc solution to form a dense protective layer on the outside of the electrical steel coating.

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