Rapid high-sensitivity detection method for tantalum metal products

Abstract

The invention provides a rapid high-sensitivity detection method for tantalum metal products, which comprises the following steps of: 1, selecting a sponge or a brush with the diameter smaller than the width of a welding seam, dipping a penetrant and only brushing a detection part; 2, a black tarpaulin is used for shielding the detection part; 3, the fluorescent dye part is cleaned, and other parts are prevented from being polluted; 4, in a dark environment, an LED flashlight type black light lamp is used for checking the cleaning effect, and it is avoided that residual penetrating agents at corners cover defect display; 5, spraying a developing agent to the detection area; step 6, marking when bright fluorescent display is found; 7, recording a defect related display position; and 8, after coping treatment, detecting and rechecking are carried out again until the product is qualified. The method solves the problems of cleaning the background of the redundant fluorescent penetrant, realizing the dark environment on site, using the LED black light lamp at any time, and performing rapid and high-sensitivity detection.

Description

Technical Field

[0001] The present invention relates to the field of nondestructive testing of metal products, and in particular to a rapid and highly sensitive testing method for tantalum metal products. Background Art

[0002] Pressure vessels are widely used in many fields such as petroleum, chemical industry, and pharmaceutical industry. In order to be suitable for various media environments, more stringent requirements are placed on the performance of the materials. One material cannot be suitable for all media environments. Only when it is suitable for targeted media can the special properties of the material be brought into play. Tantalum materials show excellent corrosion resistance in most chemical environments. They have strong resistance to corrosive media such as acids, alkalis, and salts, and can remain stable even under high temperature and strong corrosive conditions. This makes tantalum an ideal corrosion-resistant material in the fields of chemical industry and pharmaceutical industry. Because tantalum is a rare and precious metal material, there is no reference experience and technology for the manufacture of tantalum pressure vessels in China, and the various properties of tantalum materials are not well understood. Therefore, the molding quality of tantalum raw materials, the processing quality during the production process, and the uncertainty of welding quality that may occur during welding urgently need to be verified by various inspection and testing methods.

[0003] Tantalum precious metal materials are often used as composite layers or inner linings, and are mostly thin plates with a thickness of less than 2mm or even a few tenths of a millimeter. Minor surface defects can lead to corrosion and leakage accidents. The current national non-destructive testing technical standards do not include relevant testing technologies for tantalum pressure vessels. Among the existing non-destructive testing technologies: X-ray technology has difficulty in inspecting special structural parts, ultrasonic technology cannot detect such thin plates, and ordinary dye penetrant testing technology has low sensitivity (contrast ratio of approximately 6:1), which is insufficient for surface inspection of high-density materials such as tantalum. Fluorescent penetrant testing technology (contrast ratio can reach 300:1, or even 1000:1) involves fluorescent dyes that are difficult to clean and must be observed and inspected using black lights in a dedicated dark place. The product is frequently transported during the inspection process, which reduces production efficiency and makes it impossible to achieve rapid and high-sensitivity on-site inspection.

[0004] Based on the above situation, in order to improve the surface quality of tantalum precious metal products, it is very necessary to develop a fast and highly sensitive detection technology for tantalum materials. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a rapid and highly sensitive detection method for tantalum metal products. The method solves the problems of cleaning up excess fluorescent penetrant background, achieving a dark environment on site, using LED black light at any time, and rapid and highly sensitive detection.

[0006] In actual use, due to the strong penetrating ability of fluorescent dyes, they are very easy to adhere to the sprayed parts, making cleaning particularly difficult, and the cleaning effect must be checked under a black light environment. Therefore, this detection technology adopts the following detection methods: A rapid and highly sensitive detection method for tantalum metal products comprises the following steps: Step 1: Select a sponge or brush with a diameter smaller than the weld width, dip it in penetrant and apply it only to the inspection area; Step 2: Use black tarpaulin to cover the detection area; Step 3: Clean the fluorescent dye area to avoid contamination of other areas; Step 4: In a dark environment, use an LED flashlight to check the cleaning effect to avoid residual penetrant covering defects in corners; Step 5: spraying developer onto the detection area; Step 6: When bright fluorescence is detected, mark it; Step 7: Record the relevant display location of the defect; Step 8: After grinding, retest and re-inspect until qualified.

[0007] Furthermore, in step 2, the environment is measured using an illuminance meter: visible light ≤ 20 lx, black light radiation illuminance ≥ 1000 μW / cm².

[0008] Furthermore, in step 5, the whole bottle of developer is heated using warm water below 50°C.

[0009] Furthermore, in step 5, it is prohibited to use a higher temperature to bake the developer.

[0010] Furthermore, in step 5, the surrounding wind speed during spraying should not affect the adhesion to avoid multiple spraying.

[0011] Furthermore, in step 6, an LED flashlight-type black light is used to observe the inspection part, which is convenient and quick.

[0012] Furthermore, after step 8, the surface is thoroughly cleaned using an appropriate solvent or cleaning agent.

[0013] The beneficial effects of the present invention are: 1. Through the application and cleaning of fluorescent penetrant, the background is cleaned and the imaging contrast is higher; under the ultraviolet irradiation of the black light, the fluorescent penetrant at the defect will emit bright fluorescence, forming a clear fluorescent image.

[0014] 2. Through on-site dark environment preparation and the application of LED flashlight black light, on-site inspection is convenient and fast; it is not restricted by the use of black light or the structure of the workpiece, and can be used for large and complex structural parts as well as small parts.

[0015] 3. Through the implementation of the fluorescent penetrant testing process, tantalum products can be inspected and tested with high sensitivity, and even smaller surface quality risks can be discovered.

[0016] 4. This detection technology can be used in conjunction with other inspection methods. For problems found by other inspection methods, on-site rapid fluorescent penetrant detection technology can be used for fixed-point re-inspection, and the combination of these two methods can ensure product quality.

[0017] 5. Fluorescent penetrant testing is a non-destructive testing method that does not cause any damage to the object being tested, thus ensuring the integrity and reliability of the product. DETAILED DESCRIPTION

[0018] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be described clearly and completely below. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0020] The present invention mainly solves the problems existing in the prior art and provides a rapid and highly sensitive detection technology for tantalum-based precious metals. This technology ensures the contrast of the detection background by controlling the application of fluorescent penetrant on-site, the cleaning method, and the imaging process. By creating a dark detection environment on-site and using an LED flashlight-type black light, the fluorescent penetrant can be used quickly on-site, ensuring high-sensitivity surface detection of tantalum products.

[0021] The purpose of this detection technology is to take advantage of the high sensitivity of fluorescent penetrant detection, combined with the solution of various problems in the actual on-site detection process of tantalum materials workshop, to develop a rapid and highly sensitive detection technology for tantalum materials, to achieve high-sensitivity and high-precision detection of tantalum products, and to discover tiny quality risks on the surface of tantalum materials.

[0022] The following is a clear and complete description of the specific operation and implementation of this detection technology to achieve the high-sensitivity detection capability of tantalum fluorescent dyes in the field.

[0023] In actual use, due to the strong penetrating ability of fluorescent dyes, they are very easy to adhere to the sprayed parts, making cleaning particularly difficult, and the cleaning effect must be checked under a black light environment. Therefore, this detection technology adopts the following detection methods: First, the application method of fluorescent penetrant is improved: Select a sponge or brush with a diameter smaller than the width of the weld, dip it in the penetrant and apply it only to the inspection area. Do not use spraying to avoid excessive fluorescent background.

[0024] Second, the creation of a dark environment on site: First, use a black tarpaulin to cover the test area, and then use an illuminance meter to measure the environment. The standards are as follows: visible light ≤ 20lx, black light radiation illuminance ≥ 1000μW / cm².

[0025] Thirdly, the cleaning of excess fluorescent penetrant has been improved: Clean the fluorescent dye area to avoid contaminating other areas. After cleaning, check the cleaning effect in a dark environment using an LED flashlight black light to avoid residual penetrant in the corners that may cover defects.

[0026] Fourthly, control of application of developer: Shake the developer well and observe the spray pattern. If the mist particles are large, it indicates low temperature and the entire bottle of developer needs to be heated. Use warm water below 50°C. Avoid using open flames or other high-temperature methods to heat the developer. Ensure that the sprayed mist particles are fine and evenly cover the inspection area. During spraying, the surrounding wind speed should not affect adhesion to avoid multiple sprayings.

[0027] Fifth, post-imaging observation improvements: Using an LED flashlight with a black light is quick and convenient for observing the inspection area. LED flashlights with a black light start quickly, require no warm-up, and are instantly usable. The number of times they are switched on and off does not affect their service life. If bright fluorescent light is detected, it should be noted. Further confirmation and retesting, if necessary, confirm whether it is a defect-related indication.

[0028] Sixth aspect, related display processing: Record the relevant display positions of defects; after grinding, re-test and re-inspect until qualified.

[0029] Seventh aspect, post-processing: Use appropriate solvents or cleaning agents to thoroughly clean the surface, and dispose of the infiltrated waste liquid in accordance with environmental protection requirements to avoid pollution.

[0030] Using this rapid, highly sensitive tantalum material detection technology, we conducted on-site fluorescent penetrant testing of the entire tantalum composite layer using the tantalum composite pipe box inserted into the heat exchanger in the second reactor in the organosilicon project. This technology can sensitively detect minor surface processing scratches and allow for timely treatment, ensuring the quality of the raw materials used.

[0031] This rapid and highly sensitive tantalum material detection technology was used in the organic silicon project to detect the welds of the tantalum lining plates of the HCL vaporizer. On-site fluorescent penetration testing before thermal cycling revealed tiny circular displays at the joints, which were promptly processed to ensure that the thermal cycling test was qualified.

[0032] Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and substance of the present invention, persons of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall be within the scope of the present invention. Any changes or substitutions that can be readily conceived by persons skilled in the art within the technical scope disclosed in the present invention shall be within the scope of protection of the present invention.

Claims

1. A rapid and highly sensitive detection method for tantalum metal products, characterized in that: The steps include: Step 1: Select a sponge or brush with a diameter smaller than the weld width, dip it in penetrant and apply it only to the inspection area; Step 2: Use black tarpaulin to cover the detection area; Step 3: Clean the fluorescent dye area to avoid contamination of other areas; Step 4: In a dark environment, use an LED flashlight to check the cleaning effect to avoid residual penetrant covering defects in corners; Step 5: spraying developer onto the detection area; Step 6: When bright fluorescence is detected, mark it; Step 7: Record the relevant display location of the defect; Step 8: After grinding, retest and re-inspect until qualified.

2. The rapid and highly sensitive detection method for tantalum metal products according to claim 1, characterized in that: In step 2, the environment is measured using an illuminance meter: visible light ≤ 20 lx, black light radiation illuminance ≥ 1000 μW / cm².

3. The rapid and highly sensitive detection method for tantalum metal products according to claim 1, characterized in that: In step 5, the whole bottle of developer is heated using warm water below 50°C.

4. The rapid and highly sensitive detection method for tantalum metal products according to claim 1, characterized in that: In step 5, it is prohibited to use a higher temperature to bake the developer.

5. The rapid and highly sensitive detection method for tantalum metal products according to claim 1, characterized in that: In step 5, the surrounding wind speed during spraying should not affect the adhesion to avoid multiple spraying.

6. The rapid and highly sensitive detection method for tantalum metal products according to claim 1, characterized in that: In step 6, an LED flashlight-type black light is used to observe the inspection part, which is convenient and quick.

7. The rapid and highly sensitive detection method for tantalum metal products according to claim 1, characterized in that: After step 8, clean the surface thoroughly using an appropriate solvent or detergent.