CN112033989A - Method for judging crack formation time of surface of coated metal substrate - Google Patents
Method for judging crack formation time of surface of coated metal substrate Download PDFInfo
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- CN112033989A CN112033989A CN202011010477.XA CN202011010477A CN112033989A CN 112033989 A CN112033989 A CN 112033989A CN 202011010477 A CN202011010477 A CN 202011010477A CN 112033989 A CN112033989 A CN 112033989A
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- 239000002184 metal Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000758 substrate Substances 0.000 title claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 39
- 238000000576 coating method Methods 0.000 claims abstract description 39
- 239000011159 matrix material Substances 0.000 claims abstract description 15
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 12
- 238000010183 spectrum analysis Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 2
- 238000004611 spectroscopical analysis Methods 0.000 claims 2
- 239000011247 coating layer Substances 0.000 claims 1
- 238000005507 spraying Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012876 topography Methods 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
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/2206—Combination of two or more measurements, at least one measurement being that of secondary emission, e.g. combination of secondary electron [SE] measurement and back-scattered electron [BSE] measurement
-
- 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
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/225—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion
- G01N23/2251—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion using incident electron beams, e.g. scanning electron microscopy [SEM]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/07—Investigating materials by wave or particle radiation secondary emission
- G01N2223/071—Investigating materials by wave or particle radiation secondary emission combination of measurements, at least 1 secondary emission
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/102—Different kinds of radiation or particles beta or electrons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/646—Specific applications or type of materials flaws, defects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/66—Specific applications or type of materials multiple steps inspection, e.g. coarse/fine
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention discloses a method for judging the formation time of cracks on the surface of a coated metal matrix, which comprises the following steps: cutting a metallographic specimen with a surface coating, the width of which is not less than 5mm, along the cross section of the metal matrix, and observing whether the metal matrix adjacent to the coating has cracks or not at a low power under 50-100 times of an optical microscope; if the metal matrix adjacent to the coating has cracks, observing whether substances with the same structure and appearance as the coating exist in the cracks or not at a high power under the condition of 500-1000 times of an optical microscope; determining whether the main elements of the substances in the cracks are the same as the coating and whether the content of the main elements is close to that of the coating by adopting a micro-area energy spectrum analysis method under a scanning electron microscope; if the characteristics are all existed, the formation time of the cracks on the surface of the metal substrate is before the coating, otherwise, the cracks are after the coating.
Description
Technical Field
The invention belongs to the technical field of metal material surfaces, and particularly relates to a method for judging the time for forming cracks on the surface of a coated metal substrate.
Background
The coating has the advantage of greatly improving the surface performance of the material on the premise of not changing the composition of the metal matrix material, thereby being widely applied. When the failure condition of the coated metal part is continuously met in subsequent use, a large number of surface cracks exist on the surface of a metal matrix which is close to the coating when the anatomical test analysis shows that the surface cracks are formed in use before and after the spraying treatment, and the failure reason and the responsibility of the coated metal part cannot be further determined because the forming time of the surface cracks cannot be judged to be before or after the spraying treatment.
Disclosure of Invention
The invention aims to provide a method for judging the formation time of cracks on the surface of a coated metal substrate, which can accurately judge whether the formation time of the cracks on the surface of the coated metal substrate is before or after spraying treatment, thereby being beneficial to determining the failure reason and the responsibility definition of a coated metal part.
The invention is realized by adopting the following technical scheme:
a method for judging the time for forming cracks on the surface of a coated metal substrate comprises the following steps:
1) cutting a metallographic specimen with a surface coating along the cross section of the metal matrix, and observing whether the metal matrix adjacent to the coating has cracks or not at a low power under an optical microscope;
2) if the metal matrix adjacent to the coating has cracks, observing whether the structures and the appearances of substances which are the same as those of the coating exist in the cracks or not at a high power under an optical microscope;
3) determining whether the main elements of the substances in the cracks are the same as the coating and whether the content of the main elements is close to that of the coating by adopting a micro-area energy spectrum analysis method under a scanning electron microscope;
4) if the characteristics are all existed, the formation time of the cracks on the surface of the metal substrate is before the coating, otherwise, the cracks are after the coating.
A further improvement of the invention is that the metallographic specimen width, i.e. the distance of the vertical coating, is not less than 5 mm.
The invention is further improved in that the low power observation magnification of the optical microscope is 50-100 times.
The invention is further improved in that the high-power observation magnification of the optical microscope is 500-1000 times.
A further improvement of the invention is that the area of the micro-area spectral analysis is smaller than the area of the material within the crack.
The invention is further improved in that the micro-area energy spectrum analyzes that the main elements of the substances in the cracks are the same as the coating, and the content of the main elements is close to that of the coating.
The invention has the following beneficial technical effects:
the method for judging the forming time of the surface cracks of the coated metal substrate is simple and easy to implement, and can accurately judge whether the forming time of the surface cracks of the coated metal substrate is before or after spraying treatment, so that the method is beneficial to determining the failure reason and the responsibility definition of the coated metal part.
Drawings
FIG. 1 is a macro-topography of surface cracks of a coated metal substrate.
Fig. 2 is a partially enlarged view of fig. 1.
Detailed Description
The invention is further described below with reference to the following figures and examples.
The invention provides a method for judging the formation time of cracks on the surface of a coated metal substrate, which comprises the following steps:
1) cutting a metallographic specimen with a surface coating along the cross section of the metal matrix, wherein the width (namely the distance perpendicular to the coating) of the specimen is 10mm, and the length of the specimen is 20mm, and observing whether the metal matrix adjacent to the coating has cracks under the magnification of an optical microscope by 50 times, wherein the observed cracks are shown in figures 1 and 2;
2) if the metal matrix adjacent to the coating has cracks, observing whether substances with the same structure and appearance as the coating exist in the cracks under an optical microscope at a magnification of 500 times, wherein the structure and appearance of the substances in the cracks are shown in figures 1 and 2;
3) adopting a micro-area energy spectrum analysis method under a scanning electron microscope, and determining that the main elements of substances in the cracks are the same as the coating and the content of the main elements is close to that of the coating by testing the area;
4) the existence of the characteristics indicates that the formation time of the cracks on the surface of the metal substrate is before the coating.
Claims (6)
1. A method for judging the time for forming cracks on the surface of a coated metal substrate is characterized by comprising the following steps:
1) cutting a metallographic specimen with a surface coating along the cross section of the metal matrix, and observing whether the metal matrix adjacent to the coating has cracks or not at a low power under an optical microscope;
2) if the metal matrix adjacent to the coating has cracks, observing whether the structures and the appearances of substances which are the same as those of the coating exist in the cracks or not at a high power under an optical microscope;
3) determining whether the main elements of the substances in the cracks are the same as the coating and whether the content of the main elements is close to that of the coating by adopting a micro-area energy spectrum analysis method under a scanning electron microscope;
4) if the characteristics are all existed, the formation time of the cracks on the surface of the metal substrate is before the coating, otherwise, the cracks are after the coating.
2. The method as claimed in claim 1, wherein the metallographic specimen width (distance from the vertical coating layer) is not less than 5 mm.
3. The method according to claim 1, wherein the magnification of the observation with an optical microscope at low magnification is 50 to 100 times.
4. The method according to claim 1, wherein the magnification of the high power observation by the optical microscope is 500 to 1000 times.
5. The method of claim 1, wherein the micro-area spectroscopy analysis is performed on an area smaller than an area of the material within the crack.
6. The method as claimed in claim 1, wherein the micro-area spectroscopy analyzes that the main element of the substance in the crack is the same as the coating and the content of the substance is close to the coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010477.XA CN112033989A (en) | 2020-09-23 | 2020-09-23 | Method for judging crack formation time of surface of coated metal substrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010477.XA CN112033989A (en) | 2020-09-23 | 2020-09-23 | Method for judging crack formation time of surface of coated metal substrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112033989A true CN112033989A (en) | 2020-12-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011010477.XA Pending CN112033989A (en) | 2020-09-23 | 2020-09-23 | Method for judging crack formation time of surface of coated metal substrate |
Country Status (1)
| Country | Link |
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| CN (1) | CN112033989A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050136249A1 (en) * | 2003-12-18 | 2005-06-23 | Hideyuki Arikawa | Heat resistant article having thermal barrier coatinging |
| CN101398351A (en) * | 2008-10-31 | 2009-04-01 | 湘潭大学 | Method for preparing thermal curtain coating sample for researching flection damage of flat-plate structure thermal curtain coating interface |
| CN107101885A (en) * | 2017-04-25 | 2017-08-29 | 河海大学 | Acoustic emission detection cable corrosion of coating fatigue crack initiation and the experimental rig of extension |
| CN108663388A (en) * | 2018-08-15 | 2018-10-16 | 武汉钢铁有限公司 | Deposition material surface submillimeter level defect analysis method |
-
2020
- 2020-09-23 CN CN202011010477.XA patent/CN112033989A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050136249A1 (en) * | 2003-12-18 | 2005-06-23 | Hideyuki Arikawa | Heat resistant article having thermal barrier coatinging |
| CN101398351A (en) * | 2008-10-31 | 2009-04-01 | 湘潭大学 | Method for preparing thermal curtain coating sample for researching flection damage of flat-plate structure thermal curtain coating interface |
| CN107101885A (en) * | 2017-04-25 | 2017-08-29 | 河海大学 | Acoustic emission detection cable corrosion of coating fatigue crack initiation and the experimental rig of extension |
| CN108663388A (en) * | 2018-08-15 | 2018-10-16 | 武汉钢铁有限公司 | Deposition material surface submillimeter level defect analysis method |
Non-Patent Citations (3)
| Title |
|---|
| 张维平, 刘硕: "激光熔覆Ni基金属陶瓷复合涂层的裂纹研究", 复合材料学报, no. 03, pages 98 - 102 * |
| 张鸿雁 等: "KA145抗咬合合金棒开裂浅析", 《金属材料与冶金工程》, vol. 48, no. 1, pages 9 - 13 * |
| 王海宝 等: "连铸板坯角部纵裂纹缺陷的研究", 《连铸》, no. 2011, pages 343 - 348 * |
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