CN114280121A - Al-containing hot galvanizing automobile outer plate surface2O3Method for detecting inclusion linear defects - Google Patents
Al-containing hot galvanizing automobile outer plate surface2O3Method for detecting inclusion linear defects Download PDFInfo
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- 230000007547 defect Effects 0.000 title claims abstract description 111
- 238000005246 galvanizing Methods 0.000 title claims description 8
- 239000011701 zinc Substances 0.000 claims abstract description 43
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 37
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 36
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000009826 distribution Methods 0.000 claims abstract description 24
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 22
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 239000003792 electrolyte Substances 0.000 claims abstract description 14
- 238000004458 analytical method Methods 0.000 claims abstract description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 24
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 239000011159 matrix material Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000010183 spectrum analysis Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 238000012512 characterization method Methods 0.000 abstract description 4
- 238000006056 electrooxidation reaction Methods 0.000 abstract description 4
- 238000001228 spectrum Methods 0.000 description 10
- 238000009628 steelmaking Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000007431 microscopic evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses a hot-dip galvanized automobile outer plate containing Al2O3A method for detecting inclusion linear defects. The corrosion method of the invention adopts a constant-electric-quantity electrolysis method, and can accurately and effectively remove the zinc layer, thereby exactly highlighting the inclusion at the defect position on the basis of keeping the defect information of the original substrate and showing more complete full-size Al2O3The appearance of the inclusions and the distribution characteristics of the inclusions at the defects. The Al in the surface defect area of the hot-galvanized automobile outer plate is realized by combining a surface defect detection and analysis method2O3The appearance, size, quantity and distribution of inclusions and the complete characterization of the metallographic structure of the defect area. The electrolyte has simple formula, convenient implementation of electrochemical corrosion process and safe operation.
Description
Technical Field
The invention belongs to the technical field of surface quality analysis methods of steel materials, and particularly belongs to a method for analyzing Al content on the surface of a hot-galvanized automobile outer plate2O3An analysis method of inclusion linear defects.
Background
The hot-dip galvanized automobile outer plate is a thin plate product with high requirements on surface quality, and with the rapid development of the automobile industry in China, the demand volume is rapidly increased in recent years. After hot galvanizing process, the surface defects of the surface of the automobile outer plate caused by steel making are more seriousAnd is easy to visualize. The linear defects caused by steel making are the most common defects on the surface of the outer plate of the automobile, and the defects with the greatest difficulty in solving are mainly divided into three types of defects, namely inclusions, covering slag and bubble type defects. Wherein inclusions and bubble-type defects mainly contain dispersed Al2O3The inclusion particles may be collectively referred to as Al-containing particles2O3Linear defects are included, and the defects of the mold flux mainly comprise dispersed mold flux particles. The control of the surface defects of the automobile outer plate caused by steel making covers the whole steel making process of molten iron pretreatment, converter blowing, secondary refining, continuous casting and the like, and is also interwoven with the defects formed by hot rolling, pickling, cold rolling and hot galvanizing processes, and the defects relate to numerous processes and are difficult to identify, judge and improve. Thus aiming at containing Al2O3Al mixed with surface defects of automobile outer plates and in the surface defect area of hot-galvanized automobile outer plates2O3The appearance, size, quantity and distribution of inclusions and complete representation of a metallographic structure of a defect area are the basis for identifying, judging and improving the surface defects of the hot-dip galvanized automobile outer plate.
The conventional detection method for linear defects on the surface of the hot-galvanized plate mainly comprises the following steps:
1) observing and analyzing the surface of the zinc layer defect by combining a metallographic microscope and a scanning electron microscope and an energy spectrum analyzer;
2) after removing the surface zinc layer by acid corrosion, observing and analyzing by using a metallographic microscope and a scanning electron microscope in combination with an energy spectrum analyzer;
3) and (4) observing and analyzing the cross section of the defect by combining a metallographic microscope and a scanning electron microscope with an energy spectrum analyzer. However, the conventional analysis methods cannot be used for Al in the surface defect region of the hot-galvanized automobile outer plate2O3The appearance, size, quantity and distribution of inclusions and the complete characterization of a metallographic structure of a defect area are carried out for the following reasons:
1) the metallographic microscope and the scanning electron microscope are combined with an energy spectrum analyzer to observe and analyze the surface of the defect of the zinc layer, and due to the coverage of the zinc layer, metallographic structure information of the substrate surface cannot be effectively acquired, and Al cannot be acquired at the same time2O3Complete information of inclusion morphology, size, number and distribution。
2) After the surface zinc layer is removed by acid corrosion, a metallographic microscope and a scanning electron microscope are combined with an energy spectrum analyzer for observation and analysis, and the linear defect depth of the surface of the hot-dip galvanized automobile outer plate is shallow, so that the acid corrosion easily causes excessive corrosion to damage the appearance of the linear defect on the surface, so that the Al on the surface of the substrate2O3Inclusions fall off due to excessive corrosion, and complete information of original defects cannot be effectively retained, so that the defects cannot be accurately characterized.
3) For the observation and analysis of the cross section of the defect by a metallographic microscope and a scanning electron microscope combined energy spectrum analyzer, because the zinc coating and the matrix layer of the cross section can only show a contact line, Al is difficult to capture on the contact line2O3The inclusions show the full-scale morphology of the inclusions, and the distribution relationship between the inclusions and the matrix structure cannot be revealed, so that the defects cannot be completely characterized.
Therefore, Al is contained in the surface of the hot-dip galvanized automobile outer panel2O3The inclusion defects are completely identified, judged and characterized, a basis is provided for improving the surface defects of the hot-galvanized automobile outer plate, and the development of Al in the surface defect area of the hot-galvanized automobile outer plate is urgently needed2O3The appearance, size, quantity and distribution of inclusions and the complete representation of the metallographic structure of the defect area become a technical problem to be solved urgently.
Disclosure of Invention
In order to solve the problems of the prior art, the invention aims to overcome the defects in the prior art and provide a hot-galvanized automobile outer plate surface Al-containing material2O3The method for detecting the inclusion linear defects adopts constant-power electrolysis to electrolyze the outer plate of the hot-dip galvanized automobile until a zinc layer is just removed, a trace amount of a steel plate substrate is removed, and Al on the surface of the substrate2O3The inclusions are just highlighted, so that complete full-size Al is presented on the basis of keeping the defect information of the original substrate2O3The appearance of inclusions and the distribution characteristics of the inclusions in the defects realize the Al of the surface defect area of the hot-dip galvanized automobile outer plate2O3Appearance, size, quantity and distribution of inclusions and metallographic group of defect areaThe complete characterization lays a foundation for the identification, judgment and improvement of the surface defects of the hot-dip galvanized automobile outer plate.
In order to achieve the purpose, the invention adopts the following technical scheme:
al-containing hot galvanizing automobile outer plate surface2O3The detection method of the inclusion linear defect comprises the following steps:
a. preparing a chemical electrolysis system:
by using a material containing Al2O3A hot-dip galvanized automobile outer plate sample to be detected, which is mixed with linear defects, is used as an anode, a stainless steel plate is used as a cathode, an electrolyte prepared from methanol, hydrochloric acid with the mass percentage concentration of 10% and deionized water is used to form a chemical electrolysis system, and quantitative electrolysis is carried out in a constant current mode;
b. removal of zinc layer by electrolysis to reveal Al on the surface of automobile outer panel2O3Inclusion of linear defects:
according to the observed thickness of the zinc layer, the defects are electrolyzed for proper electrolysis time and with constant electricity quantity with set current density to remove the zinc layer and a steel plate matrix with certain thickness until the zinc layer is completely removed and the steel plate base is slightly removed, and Al on the surface of the substrate is removed2O3The inclusions are just highlighted, so that the inclusions with complete full-size morphology are shown on the basis of keeping the original substrate defect information, and the distribution state characteristics of the inclusions in the defects are shown at the same time;
c. microscopic observation and analysis:
al content of hot-galvanized automobile outer plate2O3Observing the microscopic appearance and performing energy spectrum analysis on the inclusion linear defects to obtain Al2O3The distribution condition and the law of the inclusions in the linear defects.
Preferably, in the step b, the proper electrolysis depth is controlled by adjusting the electrolysis current and the electrolysis time using the following formulas (1) to (4), wherein:
Q＝I·t (1)
q is the electrical quantity, C; i is the power supply output current, A; t is electrolysis time, s;
MZn、MFethe molar masses of Zn and Fe, kg/mol respectively; s is the electrolytic area, m2(ii) a h is the electrolysis depth, m; rhoZn、ρFeThe density of the zinc and the substrate in kg/m3，hZn，hFeThe electrolytic depth, m, of the zinc coating and the iron matrix respectively.
Preferably, in the step a, the size of the sample of the hot-dip galvanized automobile outer panel to be measured as the anode is 5-20mm multiplied by 0.7-1.2mm, and the size of the stainless steel plate as the cathode is 1-10cm multiplied by 0.5-5 cm.
Preferably, in the step a, the electrolyte is prepared by the following components in volume ratio, calculated according to the total volume percentage of 100% of the electrolyte: 25-55% of methanol, 25-55% of deionized water and 5-35% of hydrochloric acid with the mass percentage concentration of 10%.
Preferably, in said step b, galvanostatic electrolysis is carried out with an anodic current density of 0.01-1A/cm2。
Preferably, in the step b, the electrolysis time of the zinc coating is controlled to be 2-30 min.
Compared with the prior art, the invention has the following obvious and prominent substantive characteristics and remarkable advantages:
1. the invention electrolyzes the hot galvanizing automobile outer plate until the zinc layer is just removed, the steel plate base is removed in a trace way, and Al on the surface of the base plate2O3The inclusions are just highlighted, so that on the basis of keeping the defect information of the original substrate, the complete full-size morphology and the distribution characteristics of the inclusions in the defect are presented, and the Al of the surface defect area of the hot-galvanized automobile outer plate is realized2O3The complete representation of the appearance, size, quantity and distribution of inclusions and the metallographic structure of a defect area lays a foundation for the identification, judgment and improvement of the surface defects of the hot-dip galvanized automobile outer plate;
2. the detection method of the invention develops a method which can retain metallographic structure information of the original substrate and simultaneously reveal a defective area Al2O3Automobile outer plate containing Al mixed with complete shape, size, quantity and distribution information2O3Electrochemical corrosion method for inclusion of linear defects;
3. the method of the invention defines the sizes of the electrolytic anode and the electrolytic cathode, the component range of the electrolyte, the current density range of the anode and the electrolytic depth of the zinc coating and the iron matrix layer; al (Al)2O3The inclusions are not damaged and can be completely reserved, and the full-size morphology and the distribution characteristics of the inclusions in the substrate can be completely reflected;
4. the method realizes Al in the surface defect area of the hot-galvanized automobile outer plate2O3The complete representation of the appearance, size, quantity and distribution of inclusions and the metallographic structure of a defect area lays a foundation for the identification, judgment and improvement of the surface defects of the hot-dip galvanized automobile outer plate;
5. the electrolyte has simple formula, convenient implementation of electrochemical corrosion process and safe operation.
Drawings
FIG. 1 is a macroscopic view of the surface linear defects of the hot-dip galvanized automobile outer panel sample in example 1.
FIG. 2 is a graph showing the morphology of inclusions on the surface of a defect after electrolytic dezincification of the sample of example 1.
FIG. 3 is a graph showing an energy spectrum of inclusions on the surface of a defect after electrolytic dezincification of the sample of example 1.
FIG. 4 is a macroscopic view of the surface linear defects of the hot-dip galvanized automobile outer panel sample in example 2.
FIG. 5 is a graph of morphology and energy spectrum of inclusions on the surface of a defect after electrolytic dezincification of the sample of example 2.
FIG. 6 is a macroscopic view of the surface linear defects of the hot-dip galvanized automobile outer panel sample in example 3.
FIG. 7 is a graph of morphology and energy spectrum of inclusions on the surface of a defect after electrolytic dezincification of the sample of example 3.
Detailed Description
In the following examples, a hot-dip galvanized automobile outer panel surface contains Al2O3The detection method of the inclusion linear defect comprises the following steps:
a. preparing a chemical electrolysis system:
by using a material containing Al2O3A hot-dip galvanized automobile outer plate sample to be detected, which is mixed with linear defects, is used as an anode, a stainless steel plate is used as a cathode, an electrolyte prepared from methanol, hydrochloric acid with the mass percentage concentration of 10% and deionized water is used to form a chemical electrolysis system, and quantitative electrolysis is carried out in a constant current mode;
b. removal of zinc layer by electrolysis to reveal Al on the surface of automobile outer panel2O3Inclusion of linear defects:
according to the observed thickness of the zinc layer, the defects are electrolyzed for proper electrolysis time and with constant electricity quantity with set current density to remove the zinc layer and a steel plate matrix with certain thickness until the zinc layer is completely removed and the steel plate base is slightly removed, and Al on the surface of the substrate is removed2O3The inclusions are just highlighted, so that the inclusions with complete full-size morphology are shown on the basis of keeping the original substrate defect information, and the distribution state characteristics of the inclusions in the defects are shown at the same time;
c. microscopic observation and analysis:
al content of hot-galvanized automobile outer plate2O3Observing the microscopic appearance and performing energy spectrum analysis on the inclusion linear defects to obtain Al2O3The distribution condition and the law of the inclusions in the linear defects.
The above-described scheme is further illustrated below with reference to specific embodiments, which are detailed below:
example 1
In this example, the size of the anode of the sample cut was 5mm × 5mm × 1.2mm, and the size of the cathode stainless steel was 1cm × 1cm × 5 cm. The electrolyte used consists of 25% by volume of methanol, 40% by volume of deionized water and 35% by mass of hydrochloric acid with a concentration of 10%. The current density of the anode used in the constant current electrolysis is 0.01A/cm2. The electrolysis time of the hot-dip galvanized layer was 2 min.
And (3) carrying out macroscopic observation on the surface of the sample, wherein FIG. 1 shows the macroscopic appearance of linear defects on the surface of the hot-galvanized automobile outer plate sample, the defects are distributed along the rolling direction, the total length is 1m, and the width is 3 mm. The hot-dip galvanized automotive outer panel described above can be cut to the appropriate size for microscopic analysis.
In the embodiment, most of the zinc layer is removed, and the appearance and the distribution characteristics of the inclusions are partially exposed, and then the appearance and the components of the original substrate defects and the inclusions are observed. FIG. 2 and FIG. 3 show the morphology and energy spectrum of the inclusions on the surface of the defect after the dezincification layer of the sample by electrolysis, respectively, and it can be seen from the result of energy spectrum analysis that these are both Al2O3And (4) inclusion.
Example 2
This embodiment is substantially the same as embodiment 1, and is characterized in that:
in this example, the dimensions of the sample anode were 10mm × 10mm × 0.9mm, and the dimensions of the cathode stainless steel were 5cm × 5cm × 2 cm. The electrolyte consists of 55% of methanol, 25% of deionized water and 20% of hydrochloric acid with the mass percentage concentration of 10% by volume. The current density of the anode in constant current electrolysis was 0.1A/cm2. The electrolytic time of the zinc coating is 15 min.
And (3) carrying out macroscopic observation on the surface of the sample, wherein the macroscopic observation is as shown in FIG. 4, the macroscopic observation is the macroscopic appearance of linear defects on the surface of the hot-galvanized automobile outer plate sample, and the defects are distributed along the rolling direction and have the width of 2 mm. And cutting the hot-galvanized automobile outer plate into a proper size for detection.
In this example, the zinc layer is completely removed and the matrix is slightly corroded by 1 μm, the morphology of the inclusions and the distribution characteristics thereof in the matrix are further revealed, the original substrate defects and the inclusions thereof are observed for morphology and composition, as shown in fig. 5, and the results of energy spectrum analysis show that these are all Al2O3And (4) inclusion.
Example 3
This embodiment is substantially the same as the previous embodiment, and is characterized in that:
in this example, the dimensions of the sample anode were 20mm × 20mm × 0.7mm, and the dimensions of the cathode stainless steel were 10cm × 10cm × 0.5 cm. The electrolyte used consists of 40% by volume of methanol, 55% by volume of deionized water and 5% by mass of hydrochloric acid with a concentration of 10%. The constant current electrolysis adopts anode current density of 1A/cm2. The electrolytic time of the zinc coating is 30 min.
The surface of the sample is macroscopically observed, and FIG. 6 shows the macroscopic appearance of linear defects on the surface of the hot-galvanized automobile outer plate sample, wherein the defects are distributed along the rolling direction and have the width of about 2.5 mm. And cutting the hot-galvanized automobile outer plate into a proper size for detection.
At the moment, the zinc layer is completely removed and is electrolyzed along the matrix grain boundary in a small amount, the full-size morphology of the inclusions and the distribution characteristics in the matrix are relatively completely shown, the original substrate defects and the inclusions are observed in morphology and composition, and as shown in figure 7, the defects and the inclusions are all Al2O3And (4) inclusion.
The hot-dip galvanized automobile outer plate of the embodiment contains Al2O3A method for detecting inclusion linear defects. The etching method of the embodiment of the invention adopts a constant-electric-quantity electrolysis method, and can accurately and effectively remove the zinc layer, thereby exactly highlighting the inclusion at the defect position on the basis of keeping the defect information of the original substrate and showing more complete full-size Al2O3The appearance of the inclusions and the distribution characteristics of the inclusions at the defects. Combining with a surface defect detection and analysis method to realize Al in the surface defect area of the hot-galvanized automobile outer plate2O3Inclusion morphology, size, quantity and distributionAnd complete characterization of the metallographic structure of the defect region. The electrolyte of the embodiment of the invention has simple formula, convenient implementation of the electrochemical corrosion process and safe operation.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention should be replaced with equivalents as long as the object of the present invention is met, and the technical principle and the inventive concept of the present invention are not departed from the scope of the present invention.
Claims (6)
1. Al-containing hot galvanizing automobile outer plate surface2O3The detection method of the inclusion linear defect is characterized in that: the method comprises the following steps:
a. preparing a chemical electrolysis system:
by using a material containing Al2O3A hot-dip galvanized automobile outer plate sample to be detected, which is mixed with linear defects, is used as an anode, a stainless steel plate is used as a cathode, an electrolyte prepared from methanol, hydrochloric acid with the mass percentage concentration of 10% and deionized water is used to form a chemical electrolysis system, and quantitative electrolysis is carried out in a constant current mode;
b. removal of zinc layer by electrolysis to reveal Al on the surface of automobile outer panel2O3Inclusion of linear defects:
according to the observed thickness of the zinc layer, the defects are electrolyzed for proper electrolysis time and with constant electricity quantity with set current density to remove the zinc layer and a steel plate matrix with certain thickness until the zinc layer is completely removed and the steel plate base is slightly removed, and Al on the surface of the substrate is removed2O3The inclusions are just highlighted, so that the inclusions with complete full-size morphology are shown on the basis of keeping the original substrate defect information, and the distribution state characteristics of the inclusions in the defects are shown at the same time;
c. microscopic observation and analysis:
al content of hot-galvanized automobile outer plate2O3Microscopic appearance with linear defectsObservation and energy spectrum analysis, thereby obtaining Al2O3The distribution condition and the law of the inclusions in the linear defects.
2. The hot-dip galvanized automobile outer panel surface according to claim 1 containing Al2O3The detection method of the inclusion linear defect is characterized in that: in the step b, the proper electrolysis depth is controlled by adjusting the electrolysis current and the electrolysis time using the following formulas (1) to (4), wherein:
Q＝I·t (1)
q is the electrical quantity, C; i is the power supply output current, A; t is electrolysis time, s;
nZn 2+、nFe 2+are each Zn2+、Fe2+Mole number of (c), mol; n is a radical ofAIs an Avogastron constant;
MZn、MFethe molar masses of Zn and Fe, kg/mol respectively; s is the electrolytic area, m2(ii) a h is the electrolysis depth, m; rhoZn、ρFeThe density of the zinc and the substrate in kg/m3，hZn，hFeThe electrolytic depth, m, of the zinc coating and the iron matrix respectively.
3. The hot-dip galvanized automobile outer panel surface according to claim 1 or 2 containing Al2O3The detection method of the inclusion linear defect is characterized in that: in the step a, the hot galvanizing to be measured is used as an anodeThe size of the sample of the automobile outer plate is 5-20mm multiplied by 0.7-1.2mm, and the size of the stainless steel plate used as the cathode is 1-10cm multiplied by 0.5-5 cm.
4. The hot-dip galvanized automobile outer panel surface according to claim 1 or 2 containing Al2O3The detection method of the inclusion linear defect is characterized in that: in the step a, the volume percentage of the components of the electrolyte is 100%, and the volume ratio of the prepared components of the electrolyte is as follows: 25-55% of methanol, 25-55% of deionized water and 5-35% of hydrochloric acid with the mass percentage concentration of 10%.
5. The hot-dip galvanized automobile outer panel surface according to claim 1 or 2 containing Al2O3The detection method of the inclusion linear defect is characterized in that: in the step b, constant current electrolysis is carried out, and the current density of the anode is 0.01-1A/cm2。
6. The hot-dip galvanized automobile outer panel surface according to claim 1 or 2 containing Al2O3The detection method of the inclusion linear defect is characterized in that: in the step b, the electrolysis time of the zinc coating is controlled to be 2-30 min.
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|---|---|---|---|---|
| JP2003073884A (en) * | 2001-09-05 | 2003-03-12 | Nkk Corp | Method for manufacturing galvannealed steel sheet |
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| CN102879412A (en) * | 2012-09-15 | 2013-01-16 | 内蒙古包钢钢联股份有限公司 | Method for observing in-situ morphologies of nonmetallic inclusions in steel |
| CN103439170A (en) * | 2013-08-20 | 2013-12-11 | 首钢总公司 | Method for displaying and detecting inhibition layer of hot-dip-coated zinc sheet |
| CN111596094A (en) * | 2020-05-12 | 2020-08-28 | 上海大学 | Three-dimensional etching device and method for nonmetallic inclusions in steel |
| CN111665109A (en) * | 2020-06-19 | 2020-09-15 | 武汉钢铁有限公司 | Preparation device and method of galvanized steel sheet matrix metallographic sample |
-
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- 2021-12-29 CN CN202111633810.7A patent/CN114280121A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003073884A (en) * | 2001-09-05 | 2003-03-12 | Nkk Corp | Method for manufacturing galvannealed steel sheet |
| JP2007017378A (en) * | 2005-07-11 | 2007-01-25 | Japan Aviation Electronics Industry Ltd | Method for detecting defective part of electrolyte and object to be inspected |
| CN102879412A (en) * | 2012-09-15 | 2013-01-16 | 内蒙古包钢钢联股份有限公司 | Method for observing in-situ morphologies of nonmetallic inclusions in steel |
| CN103439170A (en) * | 2013-08-20 | 2013-12-11 | 首钢总公司 | Method for displaying and detecting inhibition layer of hot-dip-coated zinc sheet |
| CN111596094A (en) * | 2020-05-12 | 2020-08-28 | 上海大学 | Three-dimensional etching device and method for nonmetallic inclusions in steel |
| CN111665109A (en) * | 2020-06-19 | 2020-09-15 | 武汉钢铁有限公司 | Preparation device and method of galvanized steel sheet matrix metallographic sample |
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