Auxiliary device and auxiliary method for on-site metallographic coating of alloy steel in high humidity environment

Abstract

An auxiliary device and auxiliary method for on-site metallographic coating of alloy steel in a high-humidity environment include a fixed base, a fixing device, and a heat radiation plate; the fixing device is arranged on the fixed base, and is used to fix the fixed base on the workpiece to be tested, and the heat radiation plate is connected to the fixed base; the heat radiation plate is in the shape of a trumpet, and can completely cover the workpiece to be tested at that position. The present invention uses the heat radiation plate to locally heat the part to be tested, which can quickly dry the surface of the alloy steel in a humid environment, and at the same time, replaces water with anhydrous ethanol or methanol, which can avoid the emergence of rust spots in the part to be tested. The heat radiation plate of the present invention is arranged in a trumpet shape, which can not only evenly heat the part to be tested and its surroundings, but also prevent dust from adhering to the part to be tested or the surface of AC paper in dusty areas such as boiler superheaters / reheaters, thereby improving the coating quality.

Description

Technical Field

[0001] The present invention relates to the field of metallographic structure observation of metal materials, and in particular to an auxiliary device and an auxiliary method for on-site metallographic coating of alloy steel in a high-humidity environment. Background Art

[0002] Coal-fired power generation units, petrochemical plants and various structural parts in aerospace need to serve in high temperature and high stress environments at the same time, and have high requirements for the high temperature strength, oxidation resistance and corrosion resistance of the materials. Therefore, different grades of alloy steel are used for most pressure-bearing and stress-bearing components.

[0003] During the regular safety assessment and appraisal of the units and components, some components will be subject to on-site metallographic inspection. Since on-site metallographic inspection has high requirements for the surface condition of the test specimens, they need to be quickly etched and coated with AC paper metallographic film after step-by-step grinding and polishing. x 、SO x Waste gases such as these can easily form galvanic cells on the surfaces of low / medium alloy steels, martensitic steels, and other alloys, causing rust and affecting the metallographic film effect.

[0004] The existing solution to this problem typically involves on-site operators repeatedly applying the corrosion film to speed up the process, competing with the rust process to achieve a usable coating effect. This approach doesn't fundamentally address the low success rate and poor coating effect of metallographic coatings on alloy steel in humid air, but it does increase the workload of on-site personnel exponentially. Summary of the Invention

[0005] The purpose of the present invention is to provide an auxiliary device and auxiliary method for on-site metallographic coating of alloy steel in a high-humidity environment, so as to solve the problems of low success rate and poor coating effect of metallographic coating of alloy steel in a high-humidity environment in the prior art, effectively improve the efficiency of on-site staff and reduce workload.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An auxiliary device for on-site metallographic coating of alloy steel in a high-humidity environment includes a fixed base, a fixing device, and a heat radiation plate; the fixing device is arranged on the fixed base and is used to fix the fixed base on the workpiece to be tested, and the heat radiation plate is connected to the fixed base; the heat radiation plate is trumpet-shaped and can completely cover the workpiece to be tested at its location.

[0008] Furthermore, the fixing device includes a buckle and a binding belt; the binding belt passes through the fixing base, and the buckle is provided at the end of the binding belt.

[0009] Furthermore, the binding belt is a belt or elastic belt with adjustable length.

[0010] Furthermore, power supplies are provided at both ends of the fixed base, and the power supplies are connected to the heat radiation plate for supplying power to the heat radiation plate.

[0011] Furthermore, a power switch is provided on the power supply, and the power supply is a charging power supply.

[0012] Furthermore, the heat radiation plate includes an inner heating plate and an outer heat insulation plate; the inner heating plate is attached to the inner side of the outer heat insulation plate.

[0013] Furthermore, the inner heating plate is heated by resistance wire or infrared rays.

[0014] Furthermore, an auxiliary method for on-site metallographic coating of alloy steel in a high-humidity environment comprises the following steps:

[0015] (1) Grind and polish the surface of the test position of the tube sample to be tested, and use anhydrous ethanol or methanol instead of water to rinse and cool during the grinding and polishing process;

[0016] (2) Adjust the length of the buckle strap to securely fix the fixed base to the pipe sample to be tested;

[0017] (3) Adjust the fixed base to the part to be inspected, ensure that the part to be inspected is within the working range of the heat radiation plate, and turn on the power switch.

[0018] (4) Rinse the part to be tested with anhydrous ethanol or methanol to remove the polishing paste, grinding debris and other residues, revealing the metallic luster; the part to be tested is heated by the heat radiation plate and the surface is dried;

[0019] (5) Use a cotton ball dipped in a corrosive agent to corrode the part to be inspected and coat it with AC paper for metallographic examination. During this process, keep the heat radiation plate open;

[0020] (6) After the AC paper is completely dry, remove the film, turn off the power, remove the base, and complete the metallographic coating work at this position.

[0021] Compared with the prior art, the present invention has the following technical effects:

[0022] The present invention fixes a heat radiation plate on the surface of the alloy steel by a fixing device. The heat radiation plate locally heats the part to be inspected, which can quickly dry the alloy steel surface in a humid environment. In addition, the heat radiation plate is arranged in a trumpet shape, which not only can evenly heat the part to be inspected and its surroundings, such as in dusty areas such as boiler superheaters / reheaters, but also prevents dust from adhering to the part to be inspected or the surface of the AC paper, thereby improving the lamination quality.

[0023] The fixing device of the present invention includes a buckle and a binding belt, which can adapt to heat exchanger pipes of different diameters. The change in pipe diameter can be achieved by simply changing the length of the binding belt connected by the buckle. It is simple and easy to operate and has low cost.

[0024] The auxiliary method of the present invention uses anhydrous ethanol or methanol instead of water, which can prevent the rust spots from erupting on the part to be inspected.

[0025] When the present invention is used, it is only necessary to adjust the working position of the base according to the position and diameter of the pipe sample to be inspected, which is convenient and efficient, avoids repeated operations caused by frequent rust spots on the surface of alloy steel in a humid environment, improves work efficiency, and further shortens the inspection time and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Shown is a schematic structural diagram of the present invention.

[0027] Figure 2 Shown is a rendering without the present invention;

[0028] Figure 3 Shown is the effect diagram after adopting the present invention.

[0029] Description of reference numerals:

[0030] 1-Pipe fitting to be tested; 2-Fixed base; 3-Snap fastener; 4-Power supply; 5-Power switch; 6-Heat radiation plate; 7-Inner heating plate; 8-Outer insulation plate. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings:

[0032] An auxiliary device and a method for use for on-site metallographic coating of alloy steel in a high-humidity environment, comprising a fixed base 02, a buckle 03, and a heat radiation plate 06.

[0033] The pipe to be tested 01 is connected to the fixed base 02 via a length-adjustable buckle 03;

[0034] Both ends of the fixed base 02 have built-in rechargeable power supplies 04 to provide power for the heat radiation plate 06;

[0035] A heating switch 05 is provided on the fixed base 02 to control the working state of the heat radiation plate 06;

[0036] The heat radiation plate 06 is trumpet-shaped and has an inner and outer double-layer structure: the inner heating plate 07 is the heating layer, which can achieve heating function through resistance wire or infrared rays; the outer heat insulation plate 08 can prevent heat from radiating outward and will not interfere with on-site staff.

[0037] like Figure 1 As shown, the present invention provides an auxiliary device and method for on-site metallographic coating of alloy steel in a high-humidity environment. When used, the working principle is as follows:

[0038] (1) The surface of the test position of the test tube sample 01 is ground smooth and polished. During the grinding and polishing process, anhydrous ethanol or methanol is used instead of water for rinsing or cooling.

[0039] (2) Adjust the belt length of the buckle 03 so that the fixed base 02 is firmly fixed on the tube sample 01 to be tested.

[0040] (3) After grinding and polishing, fix the base 02 of the above device near the part to be inspected, ensure that the part to be inspected is within the working range of the heating plate, and turn on the power switch 05.

[0041] (4) Rinse the part to be tested with anhydrous ethanol or methanol to remove the polishing paste, grinding chips and other residues, revealing the metallic luster; the surface of the part to be tested is quickly dried after being heated by the heat radiation plate 06.

[0042] (5) Use a cotton ball dipped in an etchant (avoid using an aqueous etchant) to etch the part to be inspected and quickly coat it with AC paper. Keep the heating plate open during this process.

[0043] (6) After the AC paper is completely dry, remove the film, turn off the power, remove the base, and complete the metallographic coating work at this position.

[0044] Example:

[0045] This auxiliary device is used for on-site metallographic coating of alloy steel in high-humidity environments. It includes a fixed base 02, a clip 03, and a heat radiation plate 06. The base clip 03 can fix the device to the pipe to be tested, and the clip can be used to adjust the size to accommodate pipes of different diameters. The heat radiation plate is located on one side of the base and is shaped like a trumpet.

[0046] Rechargeable batteries are built into both ends of the fixed base to provide power for the heat radiation panels.

[0047] The heating switch of the heat radiation plate is located at one end of the base, which can control the heating function of the heat radiation plate to be turned on or off.

[0048] Belts are embedded on both sides of the buckle to accommodate pipe samples with different diameters.

[0049] The heat radiation plate has a double-layer structure, the inner layer is a heating plate, and the outer layer is a heat insulation plate, to ensure that the pipe sample to be tested is locally heated without significant impact on the outside.

[0050] There are various heating methods for heat radiation panels, including but not limited to resistance wire heating, infrared heating, etc.

[0051] The heating temperature of the heat radiation plate should not exceed 45°C, and the actual temperature of the pipe wall to be tested should not exceed 40°C; if the temperature is too high, it may cause the AC paper to dissolve retroperitoneally, thus affecting the coating effect.

[0052] A method for an auxiliary device for on-site metallographic coating of alloy steel in a high-humidity environment comprises the following steps:

[0053] 1) After selecting the location to be inspected of the tube sample, perform grinding, polishing and other treatments in accordance with the relevant procedures of "DL / T 652-1998 Guidelines for Metallographic Reproduction Technology". However, during the grinding process, avoid using water (including but not limited to tap water, desalted water, deionized water, distilled water, mineral water, etc.) to rinse the area to be inspected, and use anhydrous ethanol or methanol instead to perform the functions of flushing and cooling.

[0054] 2) After grinding and polishing, fix the base of the above device near the part to be inspected, ensure that the part to be inspected is within the working range of the heating plate, and turn on the power switch.

[0055] 3) Rinse the part to be tested with anhydrous ethanol or methanol to remove polishing paste, grinding chips and other residues, revealing the metallic luster; the surface of the part to be tested is quickly dried after being heated on the heating plate.

[0056] 4) Use a cotton ball dipped in an etchant (avoid using an aqueous etchant) to etch the part to be inspected and quickly coat it with AC paper. Keep the heating plate on during this process.

[0057] 5) After the AC paper is completely dry, remove the film, turn off the power, remove the base, and complete the metallographic coating work at this location.

[0058] Figure 2 This is the effect picture of the on-site metallographic coating of alloy steel in a high-humidity environment using existing technology. It is obvious that there are many rust spots and protrusions;

[0059] Figure 3 The effect diagram of the metallographic coating on alloy steel in high humidity environment by using this application is shown below, and Figure 2 The contrast coating is smooth.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. Auxiliary device for on-site metallographic coating of alloy steel in high humidity environment, characterized by: The device comprises a fixed base (02), a fixing device and a heat radiation plate (06); the fixing device is arranged on the fixed base (02) and is used to fix the fixed base (02) on the object to be tested, and the heat radiation plate (06) is connected to the fixed base (02); the heat radiation plate (06) is horn-shaped and can completely cover the object to be tested at its location; Both ends of the fixed base (02) are provided with power supplies (04), and the power supplies (04) are connected to the heat radiation plate (06) for supplying power to the heat radiation plate (06); The heat radiation plate (06) comprises an inner heating plate (07) and an outer heat insulation plate (08); the inner heating plate (07) is arranged on the inner side of the outer heat insulation plate (08).

2. The auxiliary device for on-site metallographic coating of alloy steel in high humidity environment according to claim 1, characterized in that: The fixing device comprises a buckle (03) and a binding belt; the binding belt passes through the fixing base (02), and the buckle (03) is provided at the end of the binding belt.

3. The auxiliary device for on-site metallographic coating of alloy steel in high humidity environment according to claim 1, characterized in that: The straps are belts or elastic bands with adjustable length.

4. The auxiliary device for on-site metallographic coating of alloy steel in high humidity environment according to claim 1, characterized in that: The power supply (04) is provided with a power switch (05), and the power supply (04) is a charging power supply.

5. The auxiliary device for on-site metallographic coating of alloy steel in high humidity environment according to claim 1, characterized in that: The inner heating plate (07) is heated by a resistance wire or infrared rays.

6. Auxiliary method for on-site metallographic coating of alloy steel in high humidity environment, characterized in that: The auxiliary device for on-site metallographic coating of alloy steel in a high-humidity environment according to any one of claims 1 to 5 comprises the following steps: (1) Grind and polish the surface of the test position of the tube sample to be tested, and rinse and cool it with anhydrous ethanol or methanol during the grinding and polishing process; (2) Adjust the length of the buckle strap to securely fix the fixed base to the pipe sample to be tested; (3) Adjust the fixed base to the part to be inspected, ensure that the part to be inspected is within the working range of the heat radiation plate, and turn on the power switch; (4) Rinse the part to be tested with anhydrous ethanol or methanol to remove the polishing paste and grinding debris, revealing the metallic luster; the part to be tested is heated by the heat radiation plate and the surface is dried; (5) Use a cotton ball dipped in a corrosive agent to corrode the part to be inspected and coat it with AC paper metallographically, while keeping the heat radiation plate open during the process; (6) After the AC paper is completely dry, remove the film, turn off the power, remove the base, and complete the metallographic coating work at this position.

Images