CN114034701A - Method for detecting zinc slag content in hot galvanizing zinc liquid - Google Patents
Method for detecting zinc slag content in hot galvanizing zinc liquid Download PDFInfo
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- CN114034701A CN114034701A CN202111328194.4A CN202111328194A CN114034701A CN 114034701 A CN114034701 A CN 114034701A CN 202111328194 A CN202111328194 A CN 202111328194A CN 114034701 A CN114034701 A CN 114034701A
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- zinc
- dross
- zinc liquid
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 239000011701 zinc Substances 0.000 title claims abstract description 114
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 114
- 239000007788 liquid Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005246 galvanizing Methods 0.000 title claims abstract description 19
- 239000002893 slag Substances 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000005498 polishing Methods 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 14
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims description 7
- 239000004312 hexamethylene tetramine Substances 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 5
- 238000005530 etching Methods 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 230000007547 defect Effects 0.000 description 4
- 230000000877 morphologic effect Effects 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- General Health & Medical Sciences (AREA)
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- Pathology (AREA)
- Immunology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Metallurgy (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention relates to a method for detecting the content of zinc dross in hot galvanizing zinc liquid, belonging to the technical field of detection methods. The method comprises the following steps: (1) during the production of the outer plate, sampling zinc liquid in a zinc pot, and cooling to obtain a block sample; (2) longitudinally cutting the block sample, and polishing and corroding the cut surface; (3) observing 10mm under microscope at 100 times2And (4) stopping the production of the outer plate when the size and the density of the suspended slag in the zinc pot in the area exceed the standard. The method can clearly identify the zinc dross in the sample and quickly and conveniently guide the control of the zinc dross in the production process of the hot galvanizing automobile outer plate.
Description
Technical Field
The invention relates to the technical field of detection methods, in particular to a method for detecting the content of zinc dross in hot galvanizing zinc liquid.
Background
The steel for the automobile outer plate directly affects the appearance quality of the whole automobile, and has strict surface quality requirements for avoiding the defects of stamping, coating and the like. For hot galvanizing automobile outer plates, the zinc slag defect on the surfaces of the automobile outer plates is one of the most common defects, and the zinc slag not only can affect the coating and appearance quality of the automobile plates, but also can seriously damage the dies in the stamping process.
The zinc dross is Fe in nature2Al5Intermetallic compound particles, insoluble in zinc and generally having a size of 1mm or less, are produced in the zinc bath and adhere to the surface of the galvanized sheet. The main reason influencing the quantity of the zinc dross on the surface of the galvanized sheet is the content of the zinc dross in the zinc liquid, so that the production of the hot-galvanized automobile outer plate can be effectively guided by timely grasping the quantity of the zinc dross in the zinc liquid, the production of the outer plate is stopped in time when the quantity of the zinc dross in the zinc liquid exceeds a certain numerical value, the outer plate is switched to be the inner plate, the qualification rate of the outer plate is ensured, and the loss is reduced.
Patent No. CN109487192A discloses a method for controlling zinc ash and pockmark defects on the surface of galvanized automobile exterior panel, wherein a similar method for detecting the content of zinc dross in the zinc liquid is mentioned, but the concentration of the corrosive liquid used for sample preparation is too high, which is easy to corrode, and thus the observation effect is affected, and how to analyze and identify the morphological characteristics of zinc dross in the zinc liquid sample to distinguish from other impurities with similar morphologies is not elucidated.
Disclosure of Invention
Aiming at the problem that the zinc dross in a sample cannot be identified in the prior art, the invention provides a method for detecting the content of the zinc dross in hot galvanizing zinc liquid, and aims to solve the problem.
The technical scheme of the invention is as follows:
a method for detecting the zinc slag content in hot galvanizing zinc liquid comprises the following steps:
(1) during the production of the outer plate, the zinc liquid in the zinc pot is sampled and cooled to obtain a block sample.
(2) Longitudinally cutting the block sample, and polishing and corroding the cut surface; the corrosive liquid used in the corrosion process contains 20-30% of hydrochloric acid and 3-4 g/L of hexamethylenetetramine.
(3) Observing 10mm under microscope at 100 times2And (4) stopping the production of the outer plate when the size and the density of the suspended slag in the zinc pot in the area exceed the standard.
Preferably, in the step (1), the zinc liquid in the zinc pot is sampled every 4 hours.
Preferably, the sampling method comprises the following steps: removing dross on the surface of the zinc liquid before sampling, wherein the sampler needs to be deep into the zinc liquid surface for 1m or less, and then the zinc liquid is rinsed for 3 times and then sampled; and (4) casting the taken zinc liquid in a mould for cooling, and cooling the zinc liquid to form a blocky sample.
Preferably, the step (2) is: and after polishing, etching the polished surface for 10-20 s by using an etching solution.
Preferably, the corrosive liquid contains 25% of hydrochloric acid and 3.5g/L of hexamethylenetetramine.
Preferably, in the step (3), the observed region is a position near the top of the sample. Since the suspended slag is less dense than zinc, it floats on the surface. The suspension slag is irregular granular in shape and is in a gray smooth cut surface shape in an observation area after polishing.
Preferably, in the step (3), when the average size of the suspended slag is more than 100 μm and the density exceeds 5/10 mm2The production of the outer plate is stopped.
Preferably, in the step (3), when the average size of the suspended slag is more than 100 μm and the density exceeds 30/10 mm2The production of the outer plate is stopped.
The invention has the beneficial effects that:
the invention clarifies how to identify the morphological characteristics of the zinc dross in a zinc liquid sample so as to distinguish the morphological characteristics from other impurities with similar morphologies, and provides a stable and controllable corrosion liquid formula. The method can clearly identify the zinc dross in the sample and quickly and conveniently guide the control of the zinc dross in the production process of the hot galvanizing automobile outer plate.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the cutting of a bulk sample in step (1) of the present invention.
FIG. 2 is a schematic cross-sectional view of the sample after the treatment in step (3) of the present invention.
FIG. 3 is a sample view of the observation area of the sample after the polishing treatment in example 1 of the present invention.
FIG. 4 is a microscopic image of a sample treated in example 1 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for detecting the zinc slag content in hot galvanizing zinc liquid comprises the following steps:
(1) the total 200 tons of BH steel HC180BD + Z for the galvanized automobile outer plate is planned to be produced, and when the total 120 tons of BH steel are produced, the zinc liquid in a zinc pot is sampled. Removing dross on the surface of the zinc liquid before sampling, enabling the sampler to go deep into the zinc liquid level for 1m or less, rinsing in the zinc liquid for 3 times, and then sampling; and (4) casting the taken zinc liquid in a mould for cooling, and cooling the zinc liquid to form a blocky sample.
(2) And (4) longitudinally cutting the zinc liquid block sample, and polishing and corroding the cut surface. After polishing, the sample was etched with 25% hydrochloric acid +3.5g/L hexamethylenetetramine.
(3) Observing 10mm under microscope at 100 times2The size and density of suspended dross in the zinc pot in the area are about 40 μm, the number of dross is 37/10 mm2. The quantity of zinc dross exceeds the standard. The production of the automobile outer plate BH steel HC180BD + Z is stopped, and the automobile outer plate BH steel is switched into inner plate deep drawing steel DX53D + Z for production. The quantity of the plate zinc dross in production is gradually increased, and the surface quality of the plate zinc dross cannot meet the requirements of an outer plate.
Example 2
A method for detecting the zinc slag content in hot galvanizing zinc liquid comprises the following steps:
(1) the total 400 tons of BH steel HC220BD + Z for the galvanized automobile outer plate is planned to be produced, and when the production reaches 90 tons, the zinc liquid in a zinc pot is sampled. Removing dross on the surface of the zinc liquid before sampling, enabling the sampler to go deep into the zinc liquid level for 1m or less, rinsing in the zinc liquid for 3 times, and then sampling; and (4) casting the taken zinc liquid in a mould for cooling, and cooling the zinc liquid to form a blocky sample.
(2) And (4) longitudinally cutting the zinc liquid block sample, and polishing and corroding the cut surface. After polishing, the sample was etched with 25% hydrochloric acid +3.5g/L hexamethylenetetramine.
(3) Observing 10mm under microscope at 100 times2The size and density of suspended dross in the zinc pot in the area are about 30 μm, the number of dross is 13/10 mm2. The quantity of the zinc slag does not exceed the standard. The production is continued, and the quality is qualified.
Example 3
A method for detecting the zinc slag content in hot galvanizing zinc liquid comprises the following steps:
(1) the planned production of galvanized automobile outer plate deep drawing steel DX54D + Z is 500 tons, and before the outer plate is rolled, the zinc liquid in the zinc pot is sampled. Removing dross on the surface of the zinc liquid before sampling, enabling the sampler to go deep into the zinc liquid level for 1m or less, rinsing in the zinc liquid for 3 times, and then sampling; and (4) casting the taken zinc liquid in a mould for cooling, and cooling the zinc liquid to form a blocky sample.
(2) And (4) longitudinally cutting the zinc liquid block sample, and polishing and corroding the cut surface. After polishing, the sample was etched with 25% hydrochloric acid +3.5g/L hexamethylenetetramine.
(3) Observing 10mm under microscope at 100 times2The size and density of suspended dross in the zinc pot in the area are about 200 μm, and the number of dross is 48/10 mm2. The quantity of zinc dross exceeds the standard. And (3) suspending the feeding of the outer plate, and continuously producing the forward material deep drawing steel DX53D + Z, wherein the surface quality of the forward material can not meet the requirements of the outer plate all the time.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method for detecting the zinc slag content in hot galvanizing zinc liquid is characterized by comprising the following steps:
(1) during the production of the outer plate, sampling zinc liquid in a zinc pot, and cooling to obtain a block sample;
(2) longitudinally cutting the block sample, and polishing and corroding the cut surface; the corrosive liquid used in the corrosion process contains 20-30% of hydrochloric acid and 3-4 g/L of hexamethylenetetramine;
(3) observing 10mm under microscope at 100 times2And (4) stopping the production of the outer plate when the size and the density of the suspended slag in the zinc pot in the area exceed the standard.
2. The method for detecting the content of the zinc dross in the hot galvanizing zinc liquid according to claim 1, wherein in the step (1), the zinc liquid in a zinc pot is sampled every 4 hours.
3. The method for detecting the zinc dross content in the hot galvanizing zinc liquid according to claim 2, wherein the sampling method comprises the following steps: removing dross on the surface of the zinc liquid before sampling, enabling the sampler to go deep into the zinc liquid level for 1m or less, rinsing in the zinc liquid for 3 times, and then sampling; and (4) casting the taken zinc liquid in a mould for cooling, and cooling the zinc liquid to form a blocky sample.
4. The method for detecting the content of the zinc dross in the hot galvanizing zinc liquid according to claim 1, wherein the step (2) is as follows: and after polishing, etching the polished surface for 10-20 s by using an etching solution.
5. The method for detecting the content of the zinc dross in the hot galvanizing zinc solution according to claim 1, wherein the corrosive solution contains 25% of hydrochloric acid and 3.5g/L of hexamethylenetetramine.
6. The method for detecting the zinc dross content in the hot dip galvanized zinc liquid as claimed in claim 1, wherein in the step (3), the observed area is a position close to the top of the sample.
7. The method for detecting the content of the zinc dross in the hot galvanizing zinc liquid according to claim 1, wherein in the step (3), when the average size of the suspended dross is more than 100 μm and the density exceeds 5/10 mm2The production of the outer plate is stopped.
8. The method for detecting the content of the zinc dross in the hot galvanizing zinc liquid according to claim 1, wherein in the step (3), when the average size of the suspended dross is more than 100 μm and the density exceeds 30 pieces/10 mm2The production of the outer plate is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111328194.4A CN114034701A (en) | 2021-11-10 | 2021-11-10 | Method for detecting zinc slag content in hot galvanizing zinc liquid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111328194.4A CN114034701A (en) | 2021-11-10 | 2021-11-10 | Method for detecting zinc slag content in hot galvanizing zinc liquid |
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| CN114034701A true CN114034701A (en) | 2022-02-11 |
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| CN202111328194.4A Pending CN114034701A (en) | 2021-11-10 | 2021-11-10 | Method for detecting zinc slag content in hot galvanizing zinc liquid |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000131314A (en) * | 1998-10-28 | 2000-05-12 | Sumitomo Metal Ind Ltd | Method for analyzing hot galvanizing bath for dross |
| CN101092681A (en) * | 2006-06-23 | 2007-12-26 | 宝山钢铁股份有限公司 | Hot galvanizing pot in type of circulating and purifying zinc |
| CN103320736A (en) * | 2013-05-27 | 2013-09-25 | 首钢总公司 | A control method for startup of continuous hot dip galvanizing |
| CN105136629A (en) * | 2015-08-24 | 2015-12-09 | 首钢总公司 | Display method of zinc crystal grains on the surface of galvanizing plate |
| CN111962001A (en) * | 2020-09-09 | 2020-11-20 | 山东钢铁集团日照有限公司 | Production and surface quality control method of cold-rolled thick-zinc-layer hot-dip pure-zinc steel strip |
-
2021
- 2021-11-10 CN CN202111328194.4A patent/CN114034701A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000131314A (en) * | 1998-10-28 | 2000-05-12 | Sumitomo Metal Ind Ltd | Method for analyzing hot galvanizing bath for dross |
| CN101092681A (en) * | 2006-06-23 | 2007-12-26 | 宝山钢铁股份有限公司 | Hot galvanizing pot in type of circulating and purifying zinc |
| CN103320736A (en) * | 2013-05-27 | 2013-09-25 | 首钢总公司 | A control method for startup of continuous hot dip galvanizing |
| CN105136629A (en) * | 2015-08-24 | 2015-12-09 | 首钢总公司 | Display method of zinc crystal grains on the surface of galvanizing plate |
| CN111962001A (en) * | 2020-09-09 | 2020-11-20 | 山东钢铁集团日照有限公司 | Production and surface quality control method of cold-rolled thick-zinc-layer hot-dip pure-zinc steel strip |
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