CN118293803A - Method for measuring thickness of aluminum zinc magnesium coating - Google Patents
Method for measuring thickness of aluminum zinc magnesium coating Download PDFInfo
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- CN118293803A CN118293803A CN202410365827.6A CN202410365827A CN118293803A CN 118293803 A CN118293803 A CN 118293803A CN 202410365827 A CN202410365827 A CN 202410365827A CN 118293803 A CN118293803 A CN 118293803A
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- aluminum zinc
- coating
- zinc magnesium
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- depth
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- 239000011248 coating agent Substances 0.000 title claims abstract description 91
- 238000000576 coating method Methods 0.000 title claims abstract description 91
- -1 aluminum zinc magnesium Chemical compound 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004611 spectroscopical analysis Methods 0.000 claims abstract description 9
- 238000007747 plating Methods 0.000 claims description 25
- 239000000758 substrate Substances 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 6
- 238000005275 alloying Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000005284 excitation Effects 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 4
- 229910000861 Mg alloy Inorganic materials 0.000 abstract description 3
- 238000004090 dissolution Methods 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract description 3
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 23
- 239000010410 layer Substances 0.000 description 23
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 description 3
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 description 3
- 229910052793 cadmium Inorganic materials 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 239000008397 galvanized steel Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004993 emission spectroscopy Methods 0.000 description 1
- 238000001336 glow discharge atomic emission spectroscopy Methods 0.000 description 1
- 238000002354 inductively-coupled plasma atomic emission spectroscopy Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention relates to a method for measuring thickness of an aluminum zinc magnesium coating, which comprises the steps of exciting a tested aluminum zinc magnesium coating sample by adopting a glow discharge spectrometry to obtain an excitation depth-element content relation curve of the aluminum zinc magnesium coating sample, and determining depth and width of an Fe element fixed range of an aluminum zinc magnesium alloy so as to determine the thickness of the aluminum zinc magnesium coating; the invention can directly measure the coating thickness of the aluminum zinc magnesium coating sample, has high measurement speed and high accuracy repeatability, directly analyzes the solid sample, directly tests the thickness of the aluminum zinc magnesium coating by using the analysis technology of a glow spectrometer, does not need chemical method dissolution treatment, reduces the test steps, reduces the dosage of chemical reagents, and has very important practical significance for evaluating and obtaining aluminum zinc magnesium coated products with better performance.
Description
Technical Field
The invention relates to the technical field of chemical inspection, in particular to a method for measuring the thickness of an aluminum zinc magnesium coating.
Background
Recently, the developed and produced high-added-value aluminum zinc magnesium color-coated product in China becomes a first-choice product in the building industry, and the new energy field is successfully advanced by the excellent product performance, so that the capability of producing a full-series high-corrosion-resistance coated product and the strength of a low-carbon environment-friendly product are marked in China; with the continuous development of aluminum zinc magnesium coating products, the variety of the related aluminum zinc magnesium coating materials is more and more, an analysis method capable of evaluating the quality of the products is required to be prepared, the technological process of the coating is controlled, and all performance indexes of the products are strictly controlled, so that the method has important and profound significance for coating production.
At present, the method for measuring the element content in the aluminum zinc magnesium coating in China is to dissolve the coating by various acid solvents, and then analyze the element content in the coating by using the traditional chemical wet analysis, spectrophotometry, inductively coupled plasma atomic emission spectroscopy and other equipment.
The glow discharge spectrometry Glow Discharge Optical Emission Spectrometry is an analysis technology developed based on the discharge principle of inert gas under low pressure, and gradually becomes a rapid quantitative analysis technology along with the continuous development of computer software and hardware and grating technology and the perfection of deep layer-by-layer quantitative mode, and is widely applied in the metallurgical analysis industry, and has the advantages of high stability, sharp spectral line, small background, less interference, layered sampling and the like, so that the glow discharge spectrometry becomes an effective analysis means for analyzing various material components and deeply analyzing; therefore, if the glow discharge spectrometry can be established to measure the element content in the aluminum zinc magnesium coating, the method has very important practical significance for obtaining the aluminum zinc magnesium material with better performance and making the aluminum zinc magnesium material develop to a great extent.
Because the glow discharge spectrometry is established to analyze the aluminum zinc magnesium plating product, the obtained test data is required to be processed, the thickness of the plating layer is required to be calculated firstly, then the content of each element in the plating layer can be calculated in a targeted manner, and the premise of the previous calculation method for the thickness of the plating layer is that only one main element in the plating layer is provided, and the content of the main element is greatly higher than the content of other elements.
The Chinese patent with publication number CN101349546A discloses a method for detecting the thickness of an iron-aluminum intermediate layer of a hot dip zinc plating plate, which comprises the following detection steps: processing the measured galvanized sheet into a sheet-shaped sample, wherein the sample can be processed into a disc shape with the diameter of 3-10 cm, the thickness is based on the thickness of the galvanized sheet, cleaning the surface of the sample by absolute ethyl alcohol, drying, then stripping the coating layer by adopting a glow spectrometry method, detecting the components of each layer, and stopping measuring when the measured components are consistent with the components of the steel plate matrix; drawing a relation curve of the components along with the thickness change of the coating according to the relation between the thickness measured each time and the components, and accurately calculating the thickness of the iron-aluminum intermediate layer according to the change rule of the contents of iron, zinc and aluminum in the coating along with the thickness; accurately calculating the thickness of the pure zinc layer; the beneficial effects of the invention are as follows: the thickness of the galvanized layer can be measured while the thickness of the iron-aluminum intermediate layer between the galvanized plate substrate and the galvanized layer is measured, and the method is simple, quick and accurate; however, the patent requires that the plating layer be dissolved by a solvent, is complicated to operate, pollutes the environment, and requires a long period of time.
The Chinese patent with publication number CN106546573B discloses a method for rapidly detecting the content of lead and cadmium in a galvanized steel sheet coating, and provides a method for rapidly detecting the content of lead and cadmium in the galvanized steel sheet coating, and the method can rapidly detect the content of Pb and Cd elements in the coating without stripping or dissolving the galvanized steel sheet coating by a chemical method; however, this patent is a measurement of the element content and does not provide a method for thickness measurement.
Disclosure of Invention
The invention provides a method for measuring the thickness of an aluminum zinc magnesium plating layer, which is characterized in that the determined aluminum zinc magnesium plating layer does not contain determined main elements, but takes two or even more than three elements as main elements, and the content is not up and down, so that the traditional plating layer thickness calculation method is not suitable for calculating the thickness of the aluminum zinc magnesium plating layer any more, a new calculation method is urgently needed for determining the thickness of the aluminum zinc magnesium plating layer, a depth-content diagram is obtained by measuring an aluminum zinc magnesium alloy through a glow discharge spectrometry, and then the depth and the width of an Fe element fixed range of the aluminum zinc magnesium alloy are determined, thereby determining the thickness of the aluminum zinc magnesium plating layer, the chemical method dissolution treatment is not needed, the measuring speed is high, the accuracy and the repeatability are high, and the method has very important practical significance for evaluating and obtaining the aluminum zinc magnesium plating product with better performance.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a method for measuring thickness of an aluminum zinc magnesium coating comprises the following steps:
Step one: exciting the tested aluminum zinc magnesium plating sample by adopting a glow discharge spectrometry until the aluminum zinc magnesium plating sample is excited to a substrate, and stopping exciting the sample when the intensity fluctuation of the main element Fe is less than 0.05V;
step two: obtaining a depth-content relation curve of an aluminum zinc magnesium coating sample;
Step three: determining the depths of the substrate main element Fe from 15+/-1% of the peak value to 50+/-1% of the peak value and 85+/-1% of the peak value from the depth-content relation curve in the second step, marking the depths as Fe 15+/-1%, fe50% and Fe 85+/-1%, and reversely pushing the peak value to the maximum value of the mass fraction of Fe between Fe 85+/-1% by the end of integration;
The depth of the alloying interface of the coating is defined as the width of the mass fraction of Fe element in the substrate, which increases from 15+/-1% of the peak value to 85+/-1% of the peak value, the depth of the coating is defined as the sum of the depth of Fe 50+/-1% and the depth of the interface, and the integral depth of the coating element is the depth of the coating.
Furthermore, the aluminum zinc magnesium plating sample is required to be manufactured into a wafer with the diameter of more than 2-10 cm or a square sheet with the side length of 2-10 cm.
Further, the measured thickness of the aluminum zinc magnesium plating layer in the sample is less than 40 mu m.
Further, the tested aluminum zinc magnesium plating sample is pretreated before excitation, the surface of the sample is washed by absolute ethyl alcohol, and the surface is dried by hot air.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention can directly measure the coating thickness of the aluminum zinc magnesium coating sample, has high measurement speed and high accuracy repeatability, the sample is directly analyzed by a solid sample, the sample can be directly tested by an analysis technology of a glow spectrometer without dissolving treatment by a chemical method, the testing steps are reduced, and the dosage of chemical reagents is reduced, so that the method for quickly detecting the coating thickness of an aluminum zinc magnesium product is established;
2) The glow discharge spectrum analysis method realizes the concept of directly analyzing the solid sample, and the glow discharge spectrum analysis method has the advantages of sputtering and exciting layer by layer from the surface of the sample, along with high analysis speed, high analysis accuracy, low detection lower limit and good quantification;
3) The method can determine the content of each element in the coating while determining the thickness of the aluminum zinc magnesium coating by utilizing a glow discharge emission spectrometry, and can replace a detection barrier for sample dissolution and liquid sample injection at the present stage, thereby meeting the quantitative detection requirement for rapidly and accurately analyzing aluminum zinc magnesium products.
Drawings
FIG. 1 is a graph showing the excitation depth versus element content of an aluminum zinc magnesium plating layer according to example 1 of the present invention.
FIG. 2 is a graph showing the depth of excitation versus element content for an aluminum zinc magnesium plated sheet according to example 2 of the present invention.
FIG. 3 is a graph showing the depth of excitation versus element content for an aluminum zinc magnesium plated sheet according to example 3 of the present invention.
Detailed Description
Embodiments of the invention are further described below with reference to the accompanying drawings:
[ example 1 ]
The invention relates to a method for measuring the thickness of an aluminum zinc magnesium coating, which comprises the following steps:
Step one: preparing an aluminum zinc magnesium coating sample into a wafer with the diameter of 8cm, cleaning the surface of the sample by using absolute ethyl alcohol, drying by using hot air, exciting the tested aluminum zinc magnesium coating sample by using a glow discharge spectrometer until the sample is excited to a substrate, and stopping exciting the sample when the intensity fluctuation of the principal element Fe is less than 0.05V.
Step two: and obtaining a depth-content relation curve of an aluminum zinc magnesium coating sample.
Step three: firstly, determining depths of increasing mass fraction of a substrate main element Fe from 16% of a peak value to 50% of the peak value and 84% of the peak value, marking the depths as Fe16%, fe50% and Fe84%, wherein the peak value is 99.56% of the maximum mass fraction between the end of integration and the end of the inversion of the mass fraction of Fe to 84%; defining the depth W of a coating alloying interface as the width of increasing the mass fraction of Fe element in the substrate from 16% of peak value to 84% of peak value; the depth L of the coating is defined as the sum of the depth S of Fe50% and the depth W of an interface, the integral depth of the coating elements is the depth L of the coating, as shown in figure 1, the thickness of the coating is 9.07 mu m, the definition of the depth L of the coating can be clearly seen in the figure, and the thickness of the coating of an aluminum zinc magnesium coating sample can be rapidly and accurately obtained by adopting the mode, so that the repeatability is good.
The comparison of the coating quantity calculated by the coating thickness obtained by the method and the actual coating quantity is shown in table 1, and the comparison shows that the coating thickness calculated by the method accords with the actual result, and the relative difference is less than 0.1g/m 3.
TABLE 1
| Zinc element/g/m 3 | Aluminum element/g/m 3 | |
| The coating amount of the method is calculated as a result | 12.87 | 18.53 |
| Actual coating quantity | 12.80 | 18.62 |
[ Example 2 ]
The invention relates to a method for measuring the thickness of an aluminum zinc magnesium coating, which comprises the following steps:
Step one: and (3) preparing the aluminum zinc magnesium coating sample into square pieces with the side length of 5cm, cleaning the surface of the sample by using absolute ethyl alcohol, drying by using hot air, exciting the tested aluminum zinc magnesium coating sample by using a glow discharge spectrometer until the sample is excited to a substrate, and stopping exciting the sample when the intensity fluctuation of the main element Fe is less than 0.05V.
Step two: and obtaining a depth-content relation curve of an aluminum zinc magnesium coating sample.
Step three: firstly, determining the depths of increasing mass fraction of a substrate principal element Fe from 15% of a peak value to 50% of the peak value and 85% of the peak value, marking the depths as Fe15%, fe50% and Fe85%, wherein the peak value is 99.55% of the maximum mass fraction between the integration end and the mass fraction of Fe 85%; defining the depth W of a coating alloying interface as the width from 15% of peak value to 85% of peak value of mass fraction of Fe element in the substrate; the coating depth L was defined as the sum of Fe50% depth S and interface depth W, the integrated depth of the coating elements was defined as coating depth L, and the coating thickness was 10.69 μm as shown in FIG. 2.
The comparison of the coating quantity calculated by the coating thickness obtained by the method and the actual coating quantity is shown in Table 2, and the comparison shows that the coating thickness calculated by the method accords with the actual result, and the relative difference is less than 0.1g/m 3.
TABLE 2
| Zinc element/g/m 3 | Aluminum element/g/m 3 | |
| The coating amount of the method is calculated as a result | 15.73 | 16.57 |
| Actual coating quantity | 15.80 | 16.62 |
[ Example 3]
The invention relates to a method for measuring the thickness of an aluminum zinc magnesium coating, which comprises the following steps:
Step one: and (3) preparing the aluminum zinc magnesium coating sample into square pieces with the side length of 5cm, cleaning the surface of the sample by using absolute ethyl alcohol, drying by using hot air, exciting the tested aluminum zinc magnesium coating sample by using a glow discharge spectrometer until the sample is excited to a substrate, and stopping exciting the sample when the intensity fluctuation of the main element Fe is less than 0.05V.
Step two: and obtaining a depth-content relation curve of an aluminum zinc magnesium coating sample.
Step three: firstly, determining depths of increasing mass fraction of a substrate principal element Fe from 14% of a peak value to 50% of the peak value and 86% of the peak value, marking the depths as Fe14%, fe50% and Fe86%, wherein the peak value is 99.64% of the mass fraction maximum value between the integration end and the mass fraction of Fe of 85%; defining the depth W of a coating alloying interface as the width from 15% of peak value to 85% of peak value of mass fraction of Fe element in the substrate; the coating depth L was defined as the sum of Fe50% depth S and interface depth W, the coating element integration depth was defined as coating depth L, and the coating thickness was 11.34 μm as shown in FIG. 3.
The comparison of the coating quantity calculated by the coating thickness obtained by the method and the actual coating quantity is shown in Table 3, and the comparison shows that the coating thickness calculated by the method accords with the actual result, and the relative difference is less than 0.1g/m 3.
TABLE 3 Table 3
| Zinc element/g/m 3 | Aluminum element/g/m 3 | |
| The coating amount of the method is calculated as a result | 16.07 | 12.82 |
| Actual coating quantity | 16.12 | 12.77 |
Claims (4)
1. The method for measuring the thickness of the aluminum zinc magnesium coating is characterized by comprising the following steps of:
Step one: exciting the tested aluminum zinc magnesium plating sample by adopting a glow discharge spectrometry until the aluminum zinc magnesium plating sample is excited to a substrate, and stopping exciting the sample when the intensity fluctuation of the main element Fe is less than 0.05V;
step two: obtaining a depth-content relation curve of an aluminum zinc magnesium coating sample;
Step three: determining the depths of the substrate main element Fe from 15+/-1% of the peak value to 50+/-1% of the peak value and 85+/-1% of the peak value from the depth-content relation curve in the second step, marking the depths as Fe 15+/-1%, fe50% and Fe 85+/-1%, and reversely pushing the peak value to the maximum value of the mass fraction of Fe between Fe 85+/-1% by the end of integration;
The depth of the alloying interface of the coating is defined as the width of the mass fraction of Fe element in the substrate, which increases from 15+/-1% of the peak value to 85+/-1% of the peak value, the depth of the coating is defined as the sum of the depth of Fe 50+/-1% and the depth of the interface, and the integral depth of the coating element is the depth of the coating.
2. The method for measuring the thickness of an aluminum zinc magnesium coating according to claim 1, wherein the aluminum zinc magnesium coating sample is required to be manufactured into a wafer with a diameter of more than 2-10 cm or a square sheet with a side length of 2-10 cm.
3. The method according to claim 1, wherein the measured thickness of the aluminum zinc magnesium plating layer in the sample is less than 40 μm.
4. The method for measuring the thickness of an aluminum zinc magnesium plating layer according to claim 1, wherein the aluminum zinc magnesium plating layer sample to be tested is pretreated before being excited, and the surface of the sample is washed with absolute ethyl alcohol and dried with hot air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410365827.6A CN118293803A (en) | 2024-03-28 | 2024-03-28 | Method for measuring thickness of aluminum zinc magnesium coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410365827.6A CN118293803A (en) | 2024-03-28 | 2024-03-28 | Method for measuring thickness of aluminum zinc magnesium coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118293803A true CN118293803A (en) | 2024-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410365827.6A Pending CN118293803A (en) | 2024-03-28 | 2024-03-28 | Method for measuring thickness of aluminum zinc magnesium coating |
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| Country | Link |
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| CN (1) | CN118293803A (en) |
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- 2024-03-28 CN CN202410365827.6A patent/CN118293803A/en active Pending
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