Molybdenum detection reagent, preparation method and use method thereof

Abstract

The invention relates to the technical field of precious metal detection, in particular to a molybdenum detection reagent, a preparation method and a use method thereof, and the molybdenum detection reagent comprises 20%-38% of hydrochloric acid, 20%-27% of nitrate and water. The 316 stainless steel and the 2205 stainless steel both contain more than 2% of molybdenum, the 316 stainless steel and the 2205 stainless steel can be distinguished through magnetism, and the 2205 stainless steel has strong magnetism. The molybdenum detection reagent can be used for detecting molybdenum ions in stainless steel so as to distinguish 316 stainless steel from 304 stainless steel. The nitrate can make the 316 stainless steel and the 304 stainless steel show different colors, so that the 316 stainless steel and the 304 stainless steel can be accurately distinguished. The reagent of the magnesium nitrate can make the reagent on the 316 stainless steel yellow, the reagent of the aluminum nitrate can make the reagent on the 316 stainless steel light yellow, and the reagent of the ferric nitrate can make the reagent on the 316 stainless steel brown. The molybdenum detection reagent can accurately and rapidly detect and identify 316 stainless steel, and is low in cost, convenient to operate and convenient to carry.

Description

Technical Field

[0001] The present invention relates to the technical field of precious metal detection, and in particular to a molybdenum detection reagent, a preparation method thereof, and a usage method thereof. Background Art

[0002] There are many types of stainless steel on the market, including 304 stainless steel, 316 stainless steel, 2205 stainless steel, etc. The compositions and properties of different types of stainless steel are different, and their uses also vary. 316 stainless steel has excellent corrosion resistance, atmospheric corrosion resistance and high temperature strength, can be used under harsh conditions, and has excellent work hardening property (non-magnetic). The existing detection methods for stainless steel models include magnetic identification, friction fire method identification, spectral detection, electrochemical detection, etc. Magnetic detection cannot distinguish between 304 stainless steel and 316 stainless steel, and the other detection methods for detecting 304 stainless steel and 316 stainless steel are very complicated. Moreover, it is very troublesome to carry the detection equipment with you, and the instrument is easily damaged during transportation, and it is impossible to perform real-time detection, which is time-consuming, laborious, costly, and the detection is cumbersome. Summary of the Invention

[0003] In order to solve the technical defects proposed in the above background art, the purpose of the present invention is to provide a molybdenum detection reagent, a preparation method thereof, and a usage method thereof.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A molybdenum detection reagent for detecting and distinguishing stainless steel models, which is composed of raw materials in the following weight percentages:

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

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

[0008] The balance is water.

[0009] By adopting the above technical solution, both 316 stainless steel and 2205 stainless steel contain more than 2% of molybdenum. 316 stainless steel and 2205 stainless steel can be magnetically discriminated, and 2205 has strong magnetism. This molybdenum detection reagent can detect molybdenum ions in stainless steel to distinguish 316 stainless steel from 304 stainless steel. Nitrate can make 316 stainless steel and 304 stainless steel show different colors, so that they can be accurately distinguished. Specifically, using a reagent of magnesium nitrate can make the reagent on 316 stainless steel show yellow, using a reagent of aluminum nitrate can make the reagent on 316 stainless steel show slightly yellow, and using a reagent of iron nitrate can make the reagent on 316 stainless steel show brown. The reagent containing iron nitrate can also make the reagent on 304 stainless steel show green. Therefore, this molybdenum detection reagent can accurately and quickly detect and identify 316 stainless steel, with low cost, convenient operation and easy to carry.

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

[0011] Further, the nitrate is set as iron nitrate.

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

[0013] A preparation method of a molybdenum detection reagent for preparing any one of the above-mentioned molybdenum detection reagents, which includes:

[0014] Step S1, measure a quantitative amount of water and place it in a mixing container, add nitrate crystals according to a ratio, and shake and mix evenly at room temperature to form a first mixed solution;

[0015] Step S2, add hydrochloric acid according to a ratio to the first mixed solution, and shake and mix evenly at room temperature to form the molybdenum detection reagent.

[0016] A usage method of a molybdenum detection reagent for detecting a product using any one of the above-mentioned molybdenum detection reagents, which includes:

[0017] Step S1, determine the number of copies of stainless steel products of each category based on the number of experiments of the above-mentioned molybdenum detection reagent; scrub the surface clean 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 one of the above-mentioned molybdenum detection reagents, drop one drop on each product respectively, and record the time and color change.

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

[0020] Both the 316 stainless steel and the 2205 stainless steel of the present invention contain more than 2% molybdenum. The 316 stainless steel and the 2205 stainless steel can be discriminated by magnetism, and the 2205 has strong magnetism. This molybdenum detection reagent can detect molybdenum ions in stainless steel to distinguish between 316 stainless steel and 304 stainless steel. The nitrate can make the 316 stainless steel and the 304 stainless steel show different colors, so that they can be accurately distinguished. Specifically, for the reagent using magnesium nitrate, the reagent on the 316 stainless steel shows yellow; for the reagent using aluminum nitrate, the reagent on the 316 stainless steel shows slightly yellow; for the reagent using iron nitrate, the reagent on the 316 stainless steel shows brown. The reagent containing iron nitrate can also make the reagent on the 304 stainless steel show green. Therefore, this molybdenum detection reagent can accurately and quickly detect and identify 316 stainless steel, with low cost, convenient operation, and easy to carry. Description of the Drawings

[0021] Figure 1Schematic diagram of the experimental results of Example 1 of the molybdenum detection reagent.

[0022] Figure 2 Schematic diagram of the experimental results of Example 2 of the molybdenum detection reagent.

[0023] Figure 3 Schematic diagram of the experimental results of Example 3 of the molybdenum detection reagent.

[0024] Figure 4 Schematic diagram of the experimental results of Example 4 of the molybdenum detection reagent.

[0025] Figure 5 Schematic diagram of the experimental results of Example 5 of the molybdenum detection reagent.

[0026] Figure 6 Schematic diagram of the experimental results of Example 6 of the molybdenum detection reagent.

[0027] Figure 7 Schematic diagram of the experimental results of Example 7 of the molybdenum detection reagent.

[0028] Figure 8 Schematic diagram of the experimental results of Comparative Example 1 of the molybdenum detection reagent.

[0029] Figure 9 Schematic diagram of the experimental results of Comparative Example 2 of the molybdenum detection reagent.

[0030] Figure 10 Schematic diagram of the experimental results of Comparative Example 3 of the molybdenum detection reagent. Detailed implementation

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0032] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0033] In the description of the present invention, if there are descriptions with words such as "several", its meaning is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the base number, above, below, within, etc. are understood as including the base number. If there are descriptions of first, second, third, etc., they are only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0034] The following will further elaborate on the embodiments of the present invention in conjunction with the attached Figure 1-10 drawings.

[0035] Embodiment 1

[0036] A molybdenum detection reagent, used for detecting and distinguishing stainless steel models, and its preparation method is as follows:

[0037] Step S1, measure 42 g of water and place it in a mixing container, add 20 g of ferric nitrate crystals, and shake and mix evenly at room temperature to form a first mixed solution;

[0038] Step S2, add 38 g of hydrochloric acid to the first mixed solution, and shake and mix evenly at room temperature to form a molybdenum detection reagent.

[0039] Embodiment 2

[0040] A molybdenum detection reagent, and its preparation method is as follows:

[0041] Step S1, measure 35 g of water and place it in a mixing container, add 25 g of ferric nitrate crystals, and shake and mix evenly at room temperature to form a first mixed solution;

[0042] Step S2, add 38 g of hydrochloric acid to the first mixed solution, and shake and mix evenly at room temperature to form a molybdenum detection reagent.

[0043] Embodiment 3

[0044] A molybdenum detection reagent, and its preparation method is as follows:

[0045] Step S1, measure 35 g of water and place it in a mixing container, add 12 g of ferric nitrate crystals, and shake and mix evenly at room temperature to form a first mixed solution;

[0046] Step S2, add 7 g of magnesium nitrate crystals to the first mixed solution, and shake and mix evenly at room temperature to form a second mixed solution;

[0047] Step S3, add 8 g of aluminum nitrate crystals to the second mixed solution, and shake and mix evenly at room temperature to form a third mixed solution;

[0048] Step S4, add 38 g of hydrochloric acid to the third mixed solution, and shake and mix evenly at room temperature to form a molybdenum detection reagent.

[0049] Example 4

[0050] A molybdenum detection reagent, and its preparation method is as follows:

[0051] Step S1, measure 37 g of water and place it in a mixing container, add 25 g of magnesium nitrate crystals, and shake and mix evenly at room temperature to form a first mixed solution;

[0052] Step S2, add 38 g of hydrochloric acid to the first mixed solution, and shake and mix evenly at room temperature to form a molybdenum detection reagent.

[0053] Example 5

[0054] A molybdenum detection reagent, and its preparation method is as follows:

[0055] Step S1, measure 37 g of water and place it in a mixing container, add 25 g of aluminum nitrate crystals, and shake and mix evenly at room temperature to form a first mixed solution;

[0056] Step S2, add 38 g of hydrochloric acid to the first mixed solution, and shake and mix evenly at room temperature to form a molybdenum detection reagent.

[0057] Example 6

[0058] A molybdenum detection reagent, and its preparation method is as follows:

[0059] Step S1, measure 37 g of water and place it in a mixing container, add 14 g of magnesium nitrate crystals, and shake and mix evenly at room temperature to form a first mixed solution;

[0060] Step S2, add 13 g of aluminum nitrate crystals to the first mixed solution, and shake and mix evenly at room temperature to form a second mixed solution;

[0061] Step S3, add 38 g of hydrochloric acid to the second mixed solution, and shake and mix evenly at room temperature to form a molybdenum detection reagent.

[0062] Example 7

[0063] A molybdenum detection reagent, and its preparation method is as follows:

[0064] Step S1, measure 62 g of water and place it in a mixing container, add 18 g of iron nitrate crystals, and shake and mix evenly at room temperature to form a first mixed solution;

[0065] Step S2, add 20 g of hydrochloric acid to the first mixed solution, and shake and mix evenly at room temperature to form a molybdenum detection reagent.

[0066] Comparative Example 1

[0067] A molybdenum detection reagent, which is different from that in Example 3 in that 5 g of iron nitrate crystals are added.

[0068] Comparative Example 2

[0069] The molybdenum detection reagent, which is different from that of Example 1 in that 36 g of ferric nitrate crystals are added.

[0070] Comparative Example 3

[0071] The molybdenum detection reagent, which is different from that of Example 2 in that 50 g of hydrochloric acid is added.

[0072] Performance detection

[0073] The following performance detections were carried out on the molybdenum detection reagents provided in Examples 1-7 and Comparative Examples 1-3 of the present application:

[0074] Take 10 products 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 respectively, scrub the surfaces clean to ensure that there are no coverings such as dirt, electroplating layers, and oxide layers on the surfaces. Use a dropper to separately suck one drop of the molybdenum detection reagents provided in Examples 1-7 and Comparative Examples 1-3 each time, and drop one drop of the molybdenum detection reagents with different formulations on the surfaces of the same products. React at room temperature (25 °C), observe the colors on each product, and record the color development time and the corresponding color changes over time.

[0075] In the color comparison card, the color depths of the detection agents include:

[0076] I - Colorless;

[0077] II - Slightly yellow;

[0078] III - Yellow;

[0079] IV - Slightly green;

[0080] V - Green;

[0081] VI - Brown;

[0082] VII - Dark brown;

[0083] VIII - Black-brown

[0084] IX - Yellow-brown

[0085] X - Corrosion mark.

[0086] Among them, 3 samples were taken for each example and comparative example respectively, and the test results were averaged. The specific test results are shown in Table 1 and the corresponding appendix Figure 1-10 .

[0087] Table 1 Performance test results

[0088]

[0089]

[0090] From the data comparison between Examples 1-7 and Comparative Examples 1-3 in Table 1 above, it can be seen that through the synergistic cooperation of various raw materials and their combined action, the present application finally achieves the effect of quickly identifying and detecting 316 stainless steel. When the temperature is too low, the detection time is longer; when the temperature is too high, the detection time is shortened. When the temperature is 25°C - 35°C, the reaction time between the stainless steel sample and the detection agent is 360s.

[0091] According to the experimental data comparison between Examples 1, 2, 3, 7 and Comparative Examples 1, 2 in Table 1, it can be known that by controlling the content of ferric nitrate in the molybdenum detection reagent, 316 stainless steel can be effectively distinguished according to the color. When the content of ferric nitrate is relatively high, the reagent colors of the detection results of 316 stainless steel and 2205 stainless steel are relatively close, which is likely to affect the accuracy of discrimination. When the content of ferric nitrate is relatively low, the colors of 314 stainless steel, 316 stainless steel, and 2205 stainless steel are basically the same, and 316 stainless steel cannot be effectively distinguished according to the color.

[0092] According to the experimental data comparison between Examples 2, 7 and Comparative Example 3 in Table 1, it can be known that by controlling the content of hydrochloric acid in the molybdenum detection reagent, 316 stainless steel can be effectively distinguished according to the color. The lower the content of hydrochloric acid, the lighter the color shown after the reaction; the higher the content of hydrochloric acid, the darker the color shown, and it is not easy to distinguish 316 stainless steel from 2205 stainless steel, and magnetic auxiliary testing is required.

[0093] According to the experimental data comparison of Examples 4, 5, 6, 7 in Table 1, when magnesium nitrate or aluminum nitrate or magnesium nitrate and aluminum nitrate are used as raw materials in the molybdenum detection reagent, 316 stainless steel and 2205 stainless steel cannot be distinguished, and the colors shown by both are the same. Further discrimination by magnetism is required, and the effect is slightly 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 also relatively simple and convenient.

[0094] Finally, it should be noted that the above are only the preferred examples of the present invention and are not used 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 perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Molybdenum detection reagent, used to detect and distinguish stainless steel types, characterized by: It is composed of the following raw materials in percentage by weight: The content of hydrochloric acid is 20%-38%; The nitrate content is 20%-27%; The balance is water.

2. The platinum detection reagent according to claim 1, characterized in that The nitrate is set to be magnesium nitrate or aluminum nitrate or a mixture of the magnesium nitrate and the aluminum nitrate.

3. The platinum detection reagent according to claim 1, characterized in that The nitrate is set to be iron nitrate.

4. The platinum detection reagent according to claim 3, characterized in that The nitrates also include magnesium nitrate and aluminum nitrate.

5. A method for preparing a molybdenum detection reagent, for preparing the molybdenum detection reagent described in any one of claims 1 to 4, characterized in that: include: Step S1, measuring a certain amount of water and placing it in a mixing container, adding nitrate crystals according to a proportion, and shaking and mixing at room temperature to form a first mixed solution; Step S2, adding hydrochloric acid to the first mixed solution according to a proportion, and shaking and mixing evenly at room temperature to form the molybdenum detection reagent.

6. A method for using a molybdenum detection reagent, using the molybdenum detection reagent described in any one of claims 1 to 4 to detect a product, characterized in that: include: Step S1, determining the number of portions of stainless steel products of each category based on the formula quantity of the molybdenum detection reagent; Scrub the surface clean to ensure there is no dirt, electroplating layer or oxide layer on the surface; Step S2, at room temperature, use a dropper to take the molybdenum detection reagent described in any one of claims 1 to 4, drop one drop on each product, and record the time and color change.

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