A method for detecting the weight of zinc layer of galvanized sheet

Abstract

The invention discloses a method for detecting the weight of zinc layer of a galvanized sheet, comprising the following steps: preparing materials; preparing a zinc weight detection sample of the galvanized sheet; cleaning the oil stains and impurities on the sample with ethanol and cloth and drying; pasting one side of the sample with transparent adhesive tape; weighing and recording with an electronic balance at this time; and recording the weight as W. 1‑1 ; Use tweezers to put the sample with tape into the beaker to generate a lot of bubbles. When the bubbles disappear, quickly take out the sample, wash the sample with deionized water, absorb the water on it with filter paper, and weigh it with an electronic balance after it is completely dried. The weight is recorded as W 1‑2 The zinc layer weight on one side can be detected, and the zinc weight on both sides of the galvanized sheet can be measured without sticking adhesive tape. The purpose of the present invention is to provide a method for detecting the zinc layer weight of a galvanized sheet, to correct the detection data of an online zinc layer thickness gauge, to determine the accuracy of a zinc layer fluorescence detector, and to improve the accuracy of zinc layer control.

Description

Technical Field

[0001] The invention relates to the field of detection technology, and in particular to a method for detecting the weight of a zinc layer of a galvanized sheet. Background Art

[0002] The data deviation between the zinc layer thickness gauge on site of the continuous hot-dip galvanizing production line of Baosteel Rare Earth Steel Cold Rolled Plate Plant and the data detected by the inspection and testing center is large. When a fault occurs, the result cannot be accurately determined, which is not conducive to the refined control of the zinc layer. A most basic and accurate detection method is needed.

[0003] Three documents were searched. Document 1 discloses a method for measuring the thickness of zinc layer on steel plate, which requires professional electronic equipment, such as probes and professional software for data processing. The main advantage of this patent is that it does not require relevant professional testing equipment, is widely applicable, and has accurate test results.

[0004] Document 2 discloses a method for measuring the zinc weight of a galvanized sheet. The solution used in the method is complex to prepare and needs to be heated. It also cannot detect the weight of the zinc layer on one side of the galvanized sheet. The advantage of this patent is that only one reagent is used to dissolve zinc, and heating is not required. It can perform single-side detection as well as double-side detection at the same time.

[0005] Document 3 discloses a method for measuring the coating thickness of zinc-aluminum-magnesium coated steel plates, which mainly uses X-ray fluorescence method, which is currently a more widely used detection method.

[0006] The advantage of this patent is that it is a method used to ensure the accuracy of production data when these devices have detection deviations or failures. Summary of the invention

[0007] The purpose of the present invention is to provide a method for detecting the weight of the zinc layer of a galvanized sheet, to correct the detection data of an online zinc layer thickness gauge, to determine the accuracy of a zinc layer fluorescence detector, and to improve the accuracy of zinc layer control.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] The present invention provides a method for detecting the weight of a zinc layer of a galvanized sheet, comprising the following steps:

[0010] 1) Material preparation:

[0011] 1000ml of 30-40% hydrochloric acid; 1 electronic balance; 1 pack of filter paper; 1 roll of ordinary transparent tape; 1 pair of iron tweezers; 1000ml beaker; 500ml of anhydrous ethanol; some clean cloths;

[0012] 3) Preparation of zinc weight test sample for galvanized sheet:

[0013] Use a punching machine to punch out a standard circular sample. You can also make samples of other geometric shapes according to the conditions of the inspection laboratory. As long as the area of ​​the sample can be accurately calculated, the sample area is recorded as S;

[0014] 3) Use ethanol and cloth to clean the oil and impurities on the sample and dry it;

[0015] 4) Use transparent tape to tape one side of the sample; weigh it with an electronic balance and record the weight; record the weight as W 1-1 ;

[0016] 5) Wear protective glasses and acid-resistant gloves, add 500ml of 30-40% hydrochloric acid into a 1000ml beaker;

[0017] 6) Use tweezers to put the sample with the tape into the beaker to generate a lot of bubbles. When the bubbles disappear, quickly take out the sample, wash the sample with deionized water, absorb the water on it with filter paper, and weigh it with an electronic balance after it is completely dried. The weight is recorded as W. 1-2 ;

[0018] 7) The above process can detect the weight of the zinc layer on one side, which is recorded as W1; the calculation formula is: W1 = (W 1-1 -W 1-2 ) / S, unit: g / m 2 ;

[0019] 8) The zinc weight on both sides of the galvanized sheet can be measured without sticking tape.

[0020] Furthermore, the width of the common transparent tape is greater than 40 mm.

[0021] Further, in step 2): the planned zinc weight is 120g / m 2 The hot-dip galvanized steel strip samples are taken with a size of 1250mm×60mm.

[0022] Furthermore, a punching machine was used to make standard discs with a diameter of 64.6 mm at the left, middle and right positions of the upper and lower surfaces of the sample, for a total of 6 discs, and they were marked respectively.

[0023] Furthermore, in step 4), there should be no gaps or bubbles between the tape and the base surface of the sample.

[0024] Furthermore, there must be no gaps or bubbles around the edges of the specimens.

[0025] Compared with the prior art, the beneficial technical effects of the present invention are:

[0026] 1. The test results are objective and accurate. Comparative equipment testing avoids the detection errors in standard sample comparison, curve calibration and other links.

[0027] 2. The material preparation, operation and calculation are simple, and all laboratories with general conditions have such conditions.

[0028] 3. It is of great significance for hot-dip galvanizing production lines. For example, according to the production data of Baosteel's rare earth steel cold-rolled sheet plant in 2020, the total production area of ​​galvanized steel strips throughout the year is 48.57 million square meters. By regularly correcting and checking the test results of online equipment, the weight of the zinc layer is finely controlled, and the average zinc coating amount is reduced by 0.5 grams per square meter. At that time, the price of zinc ingots was 18,952.43 yuan per ton, and the economic benefits could reach 920,500 yuan. The specific calculation formula is: 4857×0.5×2×18952.43×10 -6 =920,500 yuan. DETAILED DESCRIPTION

[0029] A method for detecting the weight of a zinc layer of a galvanized sheet, specifically comprising:

[0030] 1. Production of test samples. For the planned zinc weight of 120g / m 2 The hot-dip galvanized steel strip samples were taken with a size of 1250mm×60mm. Standard discs with a diameter of 64.6mm were made by punching machine at the left, middle and right positions of the upper and lower surfaces of the sample, for a total of 6 discs, and they were marked respectively.

[0031] 2. Use anhydrous ethanol to clean and dry the oil and impurities on the wafer.

[0032] 3. Use transparent tape to stick the bottom surface of the disc tightly, trim the edge of the tape to the same size as the disc with scissors and weigh it W. 1-1 .

[0033] 4. Wear protective glasses and acid-resistant gloves, and add 500ml of 30-40% hydrochloric acid into a 1000ml beaker.

[0034] Use tweezers to put the sample with the tape into the beaker. A lot of bubbles will be generated. When the bubbles disappear, quickly take out the sample, wash it with deionized water, and use filter paper to absorb the moisture on it. After it is completely dried, weigh it with an electronic balance and record it. The weight is recorded as W. 1-2 .

[0035] The above process can detect the weight of the zinc layer on the upper surface, which is recorded as W. 1 The calculation formula is: 1 =(W 1-1 -W 1-2 ) / S, unit: g / m 2 .

[0036] The same method can be used to detect the weight of the zinc layer on the lower surface, recorded as W 2The calculation formula is: 2 =(W 2-1 -W 2-2 ) / S, unit: g / m 2 .

[0037] Table 1 below is based on 120g / m 2 The test data of galvanized sheet is taken as an example.

[0038] Table 1120g / m 2 Galvanized sheet zinc weight test data

[0039]

[0040] From the above data, it can be analyzed that the upper and lower surfaces of the zinc layer control exceed the planned value of the single-sided zinc layer of 60g / m 2 In this way, the accuracy of the online zinc layer thickness gauge or fluorescence detector can be judged and data referenced, thereby reducing zinc consumption and reducing production costs.

[0041] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for detecting the weight of zinc layer of galvanized sheet, characterized in that: The steps include: 1) Material preparation: 1000ml of 30-40% hydrochloric acid; 1 electronic balance; 1 pack of filter paper; 1 roll of ordinary transparent tape; 1 pair of iron tweezers; 1000ml beaker; 500ml of anhydrous ethanol; some clean cloths; 2) Preparation of zinc weight test sample for galvanized sheet: Use a punching machine to punch out a standard circular sample. You can also make samples of other geometric shapes according to the conditions of the inspection laboratory. As long as the area of ​​the sample can be accurately calculated, the sample area is recorded as S; 3) Use ethanol and cloth to clean the oil and impurities on the sample and dry it; 4) Use transparent tape to tape one side of the sample; weigh it with an electronic balance and record the weight; record the weight as W 1-1 ; 5) Wear protective glasses and acid-resistant gloves, add 500ml of 30-40% hydrochloric acid into a 1000ml beaker; 6) Use tweezers to put the sample with the tape into the beaker to generate a lot of bubbles. When the bubbles disappear, quickly take out the sample, wash the sample with deionized water, absorb the water on it with filter paper, and weigh it with an electronic balance after it is completely dried. The weight is recorded as W. 1-2 ; 7) The above process can detect the weight of the zinc layer on one side, recorded as W1; The calculation formula is: W1=(W 1-1 -W 1-2 ) / S, unit: g / m 2 ; 8) The zinc weight on both sides of the galvanized sheet can be measured without sticking tape.

2. The method for detecting the weight of the zinc layer of the galvanized sheet according to claim 1, characterized in that: The width of the common transparent adhesive tape is greater than 40 mm.

3. The method for detecting the weight of the zinc layer of the galvanized sheet according to claim 1, characterized in that: In the step 2), the planned zinc weight is 120 g / m 2 The hot-dip galvanized steel strip samples are taken with a size of 1250mm×60mm.

4. The method for detecting the weight of the zinc layer of the galvanized sheet according to claim 2, characterized in that: Use a punching machine to make standard discs with a diameter of 64.6 mm at the left, middle and right positions on the upper and lower surfaces of the sample, a total of 6 discs, and mark them separately.

5. The method for detecting the weight of the zinc layer of the galvanized sheet according to claim 1, characterized in that: In step 4), there should be no gaps or bubbles between the tape and the base surface of the sample.

6. The method for detecting the weight of the zinc layer of the galvanized sheet according to claim 5, characterized in that: In particular, there should be no gaps or bubbles around the edges of the specimen.

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