Molybdenum detection reagent, method of preparation and method of use thereof

Abstract

The present application relates to noble metal detection technical field, especially to molybdenum detection reagent, preparation method and use method thereof, molybdenum detection reagent, it includes 20% 38% content of hydrochloric acid, 20% 27% content of nitrate and water.316 stainless steel and 2205 stainless steel contain 2% or more molybdenum, 316 stainless steel and 2205 stainless steel can be distinguished by magnetism, and 2205 has strong magnetism.The molybdenum detection reagent can detect molybdenum ions in stainless steel to distinguish 316 stainless steel and 304 stainless steel.Nitrate can make 316 stainless steel and 304 stainless steel show different colors, so that accurate distinction can be made.Nitrate reagent can make the reagent on 316 stainless steel show yellow, and the reagent using aluminum nitrate can make the reagent on 316 stainless steel show yellow, and the reagent using iron nitrate can make the reagent on 316 stainless steel show brown.The molybdenum detection reagent can accurately and quickly detect and identify 316 stainless steel, has low cost, convenient operation and is convenient to carry.

Description

Molybdenum detection reagents, preparation methods and usage methods Technical Field

[0001] This invention relates to the field of precious metal detection technology, and in particular to molybdenum detection reagents, preparation methods, and usage methods. Background Technology

[0002] There are many types of stainless steel on the market, including 304 stainless steel, 316 stainless steel, 2205 stainless steel, etc. Different types of stainless steel have different compositions and properties, and are used for different purposes. 316 stainless steel has particularly good corrosion resistance, atmospheric corrosion resistance, and high-temperature strength, allowing it to be used under harsh conditions. It also has excellent work hardening properties (non-magnetic). Current methods for testing stainless steel types include magnetic identification, friction pyrolysis, spectroscopic detection, and electrochemical detection. Magnetic attraction testing cannot distinguish between 304 and 316 stainless steel. Other methods for testing 304 and 316 stainless steel are complex, and the testing equipment is cumbersome to carry, easily damaged during transportation, cannot be performed in real time, and is time-consuming, labor-intensive, costly, and cumbersome. Summary of the Invention

[0003] In order to address the technical deficiencies mentioned in the background section, the present invention aims to provide a molybdenum detection reagent, a preparation method, and a method of using it.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] Molybdenum testing reagent, used to detect and differentiate stainless steel grades, comprises the following raw materials in weight percentages:

[0006] The hydrochloric acid content is 20%-38%;

[0007] The nitrate content is 20%-27%;

[0008] The remainder is water.

[0009] By adopting the above technical solution, both 316 and 2205 stainless steel contain more than 2% molybdenum. 316 and 2205 stainless steel can be distinguished by magnetism, with 2205 exhibiting strong magnetism. This molybdenum detection reagent can detect molybdenum ions in stainless steel to differentiate between 316 and 304 stainless steel. Nitrates can cause 316 and 304 stainless steel to exhibit different colors, thus allowing for accurate differentiation. Specifically, using magnesium nitrate reagent will make the reagent on 316 stainless steel appear yellow, using aluminum nitrate reagent will make it slightly yellow, and using ferric nitrate reagent will make it brown. Reagents containing ferric nitrate can also make the reagent on 304 stainless steel appear green. Therefore, this molybdenum detection reagent can accurately and quickly detect and identify 316 stainless steel, is low in cost, easy to operate, and portable.

[0010] Furthermore, the nitrate is set as magnesium nitrate, aluminum nitrate, or a mixture of magnesium nitrate and aluminum nitrate.

[0011] Furthermore, the nitrate is ferric nitrate.

[0012] Furthermore, the nitrate also includes magnesium nitrate and aluminum nitrate.

[0013] A method for preparing a molybdenum detection reagent, used to prepare any of the molybdenum detection reagents described above, comprising:

[0014] Step S1: Measure a certain amount of water and place it in a mixing container. Add nitrate crystals according to the ratio and shake and mix evenly at room temperature to form the first mixture.

[0015] Step S2: Add hydrochloric acid to the first mixture according to the proportion, and shake and mix evenly at room temperature to form the molybdenum detection reagent.

[0016] The method of using molybdenum detection reagents, which involves using any of the molybdenum detection reagents described above to test products, includes:

[0017] Step S1: Determine the number of samples of each type of stainless steel product to be taken based on the experimental quantity of the molybdenum detection reagent described above; clean the surface to ensure that there is no dirt, electroplating layer, or oxide layer on the surface;

[0018] Step S2: At room temperature, use a dropper to take any of the molybdenum detection reagents described above, and drop one drop onto each product, recording the time and color change.

[0019] In summary, the beneficial effects of the present invention are as follows:

[0020] This invention relates to a molybdenum detection reagent that detects molybdenum ions in both 316 and 2205 stainless steel, both of which contain more than 2% molybdenum. 316 and 2205 stainless steel can be distinguished by magnetic properties, with 2205 exhibiting strong magnetism. This molybdenum detection reagent can detect molybdenum ions in stainless steel to differentiate between 316 and 304 stainless steel. Nitrates can cause 316 and 304 stainless steel to exhibit different colors, thus allowing for accurate differentiation. Specifically, using a magnesium nitrate reagent will make the reagent on 316 stainless steel appear yellow, using an aluminum nitrate reagent will make it appear slightly yellow, and using a ferric nitrate reagent will make it appear brown. A ferric nitrate-containing reagent will also make the reagent on 304 stainless steel appear green. Therefore, this molybdenum detection reagent can accurately and quickly detect and identify 316 stainless steel, is low in cost, easy to operate, and portable. Attached Figure Description

[0021] Figure 1 is a schematic diagram of the experimental results of Example 1 of the molybdenum detection reagent.

[0022] Figure 2 is a schematic diagram of the experimental results of Example 2 of the molybdenum detection reagent.

[0023] Figure 3 is a schematic diagram of the experimental results of Example 3 of the molybdenum detection reagent.

[0024] Figure 4 is a schematic diagram of the experimental results of Example 4 of the molybdenum detection reagent.

[0025] Figure 5 is a schematic diagram of the experimental results of Example 5 of the molybdenum detection reagent.

[0026] Figure 6 is a schematic diagram of the experimental results of Example 7 of the molybdenum detection reagent.

[0027] Figure 7 is a schematic diagram of the experimental results of Comparative Example 1 of the molybdenum detection reagent.

[0028] Figure 8 is a schematic diagram of the experimental results of Comparative Example 2 of the molybdenum detection reagent.

[0029] Figure 9 is a schematic diagram of the experimental results of Comparative Example 3 of the molybdenum detection reagent. Detailed Implementation

[0030] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0031] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0032] In the description of this invention, the use of terms such as "a number" means one or more, with "more than" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while terms like "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the number of indicated technical features, or the sequential relationship between indicated technical features.

[0033] The embodiments of the present invention will be further described in detail below with reference to Figures 1-9.

[0034] Example 1

[0035] Molybdenum testing reagent, used to detect and differentiate stainless steel grades, is prepared as follows:

[0036] Step S1: Measure 42g of water and place it in a mixing container, add 20g of ferric nitrate crystals, and shake and mix evenly at room temperature to form the first mixture.

[0037] Step S2: Add 38g of hydrochloric acid to the first mixture and shake well at room temperature to form a molybdenum detection reagent.

[0038] Example 2

[0039] The preparation method of the molybdenum detection reagent is as follows:

[0040] Step S1: Measure 35g of water and place it in a mixing container, add 25g of ferric nitrate crystals, and shake and mix evenly at room temperature to form the first mixture.

[0041] Step S2: Add 38g of hydrochloric acid to the first mixture and shake well at room temperature to form a molybdenum detection reagent.

[0042] Example 3

[0043] The preparation method of the molybdenum detection reagent is as follows:

[0044] Step S1: Measure 35g of water and place it in a mixing container, add 12g of ferric nitrate crystals, and shake and mix evenly at room temperature to form the first mixture.

[0045] Step S2: Add 7g of magnesium nitrate crystals to the first mixture and shake and mix evenly at room temperature to form a second mixture;

[0046] Step S3: Add 8g of aluminum nitrate crystals to the second mixture and shake and mix evenly at room temperature to form a third mixture;

[0047] Step S4: Add 38g of hydrochloric acid to the third mixture and shake well at room temperature to form a molybdenum detection reagent.

[0048] Example 4

[0049] The preparation method of the molybdenum detection reagent is as follows:

[0050] Step S1: Measure 37g of water and place it in a mixing container, add 25g of magnesium nitrate crystals, and shake and mix evenly at room temperature to form the first mixture.

[0051] Step S2: Add 38g of hydrochloric acid to the first mixture and shake well at room temperature to form a molybdenum detection reagent.

[0052] Example 5

[0053] The preparation method of the molybdenum detection reagent is as follows:

[0054] Step S1: Measure 37g of water and place it in a mixing container, add 25g of aluminum nitrate crystals, and shake and mix evenly at room temperature to form the first mixture.

[0055] Step S2: Add 38g of hydrochloric acid to the first mixture and shake well at room temperature to form a molybdenum detection reagent.

[0056] Example 6

[0057] The preparation method of the molybdenum detection reagent is as follows:

[0058] Step S1: Measure 62g of water and place it in a mixing container, add 18g of ferric nitrate crystals, and shake and mix evenly at room temperature to form the first mixture.

[0059] Step S2: Add 20g of hydrochloric acid to the first mixture and shake well at room temperature to form a molybdenum detection reagent.

[0060] Comparative Example 1,

[0061] The molybdenum detection reagent differs from that in Example 3 in that 5g of ferric nitrate crystals are added.

[0062] Comparative Example 2,

[0063] The molybdenum detection reagent differs from that in Example 1 in that 36g of ferric nitrate crystals are added.

[0064] Comparative Example 3

[0065] The molybdenum detection reagent differs from that in Example 2 in that 50g of hydrochloric acid is added.

[0066] Performance testing

[0067] The following performance tests were performed on the molybdenum detection reagents provided in Examples 1-6 and Comparative Examples 1-3 of this application:

[0068] Take 10 samples each of 409 stainless steel, 410 stainless steel, 430 stainless steel, 440 stainless steel, 201 stainless steel, 304 stainless steel, 316 stainless steel, and 2205 stainless steel. Clean the surfaces to ensure there are no dirt, electroplating layers, oxide layers, or other coverings. Use a dropper to take one drop of the molybdenum detection reagent provided in Examples 1-6 and Comparative Examples 1-3 for each sample. Place one drop of the molybdenum detection reagent with a different formulation on the surface of each sample. React at room temperature (25°C), observe the color on each sample, and record the color development time and the corresponding color change over time.

[0069] In the colorimetric chart, the color depth of the test reagent includes:

[0070] I - Colorless;

[0071] II- Slightly yellow;

[0072] III-Yellow;

[0073] IV-Slightly green;

[0074] V - Green;

[0075] VI - Brown;

[0076] VII - Dark brown;

[0077] VIII-Dark Brown

[0078] IX - Yellow-brown

[0079] X-Etching imprint.

[0080] In each embodiment and comparative example, three samples were taken, and the test results were averaged. The specific test results are shown in Table 1 and the corresponding figures 1-9.

[0081] Table 1 Performance Test Results

[0082]

[0083] A comparison of the data from Examples 1-6 and Comparative Examples 1-3 in Table 1 above shows that this application achieves rapid identification and detection of 316 stainless steel through the synergistic effect of multiple raw materials. The detection time is longer at lower temperatures and shorter at higher temperatures. At a temperature of 25℃-35℃, the reaction time between the stainless steel sample and the detection reagent is 360 seconds.

[0084] A comparison of the experimental data from Examples 1, 2, 3, and 6 with Comparative Examples 1 and 2 in Table 1 shows that controlling the ferric nitrate content in the molybdenum detection reagent can effectively distinguish 316 stainless steel based on color. When the ferric nitrate content is high, the color difference in the detection results for 316 stainless steel and 2205 stainless steel is small, which can easily affect the accuracy of differentiation. When the ferric nitrate content is low, the colors of 314 stainless steel, 316 stainless steel, and 2205 stainless steel are basically the same, making it impossible to effectively distinguish 316 stainless steel based on color.

[0085] A comparison of the experimental data from Examples 2 and 6 with Comparative Example 3 in Table 1 shows that controlling the hydrochloric acid content in the molybdenum detection reagent can effectively distinguish 316 stainless steel based on color. The lower the hydrochloric acid content, the lighter the color after the reaction; the higher the hydrochloric acid content, the darker the color, making it difficult to distinguish between 316 and 2205 stainless steel, requiring magnetic auxiliary testing.

[0086] Based on the comparison of experimental data from Examples 4, 5, and 6 in Table 1, it can be seen that the molybdenum detection reagent using magnesium nitrate, aluminum nitrate, or a combination of both as raw materials cannot distinguish between 316 stainless steel and 2205 stainless steel, as they display the same color. Further identification through magnetic means is required. The effect is somewhat worse than the experimental effect of adding ferric nitrate to the molybdenum detection reagent. However, 314 stainless steel and 316 stainless steel can be distinguished by color, and 316 stainless steel and 2205 stainless steel can be distinguished by physical means, which is relatively simple and convenient.

[0087] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An application of a molybdenum detection reagent in detecting and distinguishing between stainless steel grades 304 and 316, characterized in that, Step S1: Determine the number of stainless steel products to be taken for each category based on the formula quantity of the molybdenum detection reagent; clean the surface to ensure that there is no dirt, electroplating layer, or oxide layer on the surface; Step S2: At room temperature, use a dropper to take molybdenum detection reagent and drop one drop onto each product sample, recording the time and color change; the molybdenum detection reagent is composed of the following raw materials in weight percentage: hydrochloric acid content is 20%-38%; nitrate content is 20%-27%; the balance is water; the nitrate is set as magnesium nitrate, or aluminum nitrate, or a mixture of magnesium nitrate and aluminum nitrate, or ferric nitrate.

2. The application of the molybdenum detection reagent according to claim 1 in detecting and distinguishing between stainless steel grades 304 and 316, characterized in that, The preparation method of the molybdenum detection reagent includes: step S1, measuring a certain amount of water and placing it in a mixing container, adding nitrate crystals according to a certain ratio, and shaking and mixing evenly at room temperature to form a first mixture; step S2, adding hydrochloric acid to the first mixture according to a certain ratio, and shaking and mixing evenly at room temperature to form the molybdenum detection reagent.

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