CN114441306A - Method and device for testing metal protective coating in stress corrosion environment - Google Patents
Method and device for testing metal protective coating in stress corrosion environment Download PDFInfo
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- CN114441306A CN114441306A CN202111609304.4A CN202111609304A CN114441306A CN 114441306 A CN114441306 A CN 114441306A CN 202111609304 A CN202111609304 A CN 202111609304A CN 114441306 A CN114441306 A CN 114441306A
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- protective coating
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- 239000002184 metal Substances 0.000 title claims abstract description 82
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 82
- 239000011253 protective coating Substances 0.000 title claims abstract description 76
- 230000007797 corrosion Effects 0.000 title claims abstract description 42
- 238000005260 corrosion Methods 0.000 title claims abstract description 42
- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims description 34
- 230000036316 preload Effects 0.000 claims description 6
- 229910000856 hastalloy Inorganic materials 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims 2
- 238000000576 coating method Methods 0.000 claims 2
- 238000010998 test method Methods 0.000 claims 1
- 239000010953 base metal Substances 0.000 abstract description 14
- 238000011068 loading method Methods 0.000 abstract description 6
- 239000000654 additive Substances 0.000 abstract description 3
- 230000000996 additive effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000010288 cold spraying Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
- G01N2203/024—Corrosive
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- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Pathology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention relates to a method and a device for testing a metal protective coating in a stress corrosion environment, and belongs to the technical field of additive manufacturing. According to the method and the device for testing the metal protective coating in the stress corrosion environment, the stress ring is miniaturized, the base metal is preloaded during testing, then the metal protective coating is prepared, secondary small load is applied, and the base metal protective coating is soaked in a corrosion medium for corrosion testing. According to the invention, the tensile stress load of the metal protective coating in the test process is reduced by a secondary loading method, the tensile failure of the metal protective coating is avoided, and the corrosion resistance advantage of the protective coating is highlighted; the test results of the base metal and the metal protective coating are more contrastive through a secondary loading mode, and the stress corrosion performance of the protective coating can be effectively analyzed under the same test condition; the testing device for the metal protective coating in the stress corrosion environment adopts a miniaturized stress ring device, so that the testing method and the testing device are simpler and more convenient.
Description
Technical Field
The invention relates to a method and a device for testing a metal protective coating in a stress corrosion environment, and belongs to the technical field of additive manufacturing.
Background
The pressure vessel steel is easy to be subject to stress corrosion in high-pressure and corrosive environments due to complex working environments, and cracks are easy to form at welding defects to influence the service life of pressure-bearing equipment. As a novel surface protective coating preparation technology, the cold spraying technology has the characteristics of high kinetic energy, low-temperature deposition and the like of the sprayed particles, and the prepared protective coating has the advantages of high bonding strength, low porosity and the like; moreover, in the deposition process of the protective coating, the particles with high kinetic energy also have the shot blasting effect, so that the strength of the welding seam is improved to a certain extent. Researches show that the aluminum-based composite protective coating prepared on the surface of the pressure vessel steel can provide cathode protection for the base metal and improve the corrosion resistance of the base metal, and the stress corrosion cracking behavior is expected to be improved by preparing the protective coating with high bonding strength and good corrosion resistance. In the existing national standard, the stress corrosion test of the metal protective coating is not clear, so the preparation requirement of the test template is strict, and the application of the metal additive manufacturing technology in engineering is limited to a certain extent.
The existing method and device for testing the stress corrosion of the metal protective coating by utilizing the stress ring loading are mainly used for metal blocks, the test process is one-time loading and then local soaking, and the tensile load of a metal sample is generally larger (0.8% Rel). For the metal protective coating, compared with the metal base material, the metal protective coating has small bearing capacity and can crack after exceeding the bearing limit, so that the stress corrosion result of the metal protective coating cannot be obtained by using the traditional stress ring testing method, and the improvement is needed.
Disclosure of Invention
The invention aims to provide a method and a device for testing a metal protective coating in a stress corrosion environment.
The invention aims to realize the purpose through the following technical scheme, and the method for testing the metal protective coating in the stress corrosion environment specifically comprises the following steps:
y＝πD(D-t)S/4tE (1)
wherein y is stress ring deflection, pi is circumferential rate, E is elastic modulus, t is stress ring thickness, D is stress ring outer diameter, and S is base metal axial tensile stress;
and 7, recording the test data and the result.
The invention also provides a device for testing the metal protective coating in the stress corrosion environment, which comprises: the device comprises a base, a stress ring, a pin, a nut, a metal protective coating, a fixing rod, a screw and a base metal;
the screw rod is connected with the nut and the base through threads and is used for transferring load to the base metal and the metal protective coating; the screw rod is fixedly connected with the fixed rod; the base material and the metal protective coating are fixed on the fixing rod through the pin and are centrally fixed on the stress ring through the fixing rod and the screw;
further, the fixing rod and the nut are used for applying a preload before the metal protective coating is prepared on the surface of the base material and applying a secondary small load after the metal protective coating is prepared on the surface of the base material;
further, the deflection of the stress ring is used for determining the tensile load of the parent metal and the metal protective coating;
preferably, except for the base metal and the metal protective coating, the base, the stress ring pin, the nut, the fixing rod and the screw are all made of hastelloy with high corrosion resistance and the grade of the hastelloy is C276, and corrosion in a corrosion medium is ignored.
Has the advantages that:
1. the invention discloses a testing method of a metal protective coating in a stress corrosion environment, which is characterized in that a base material is pre-loaded before the metal protective coating is prepared, and the secondary loading method reduces the tensile stress load of the metal protective coating in the testing process, avoids the tensile failure of the metal protective coating and highlights the corrosion resistance advantage of the protective coating;
2. according to the method for testing the metal protective coating in the stress corrosion environment, disclosed by the invention, the test results of the base metal and the metal protective coating are more contrastive in a secondary loading mode, and the stress corrosion performance of the protective coating can be effectively analyzed under the same test conditions;
3. the invention discloses a testing device of a metal protective coating in a stress corrosion environment, which adopts a miniaturized stress ring device to ensure that the testing method and the testing device are simpler and more convenient.
Drawings
FIG. 1 is a schematic flow chart of a method for testing a metal protective coating in a stress corrosion environment according to the present invention;
FIG. 2 is a schematic view of the overall structure of a device for testing a metal protective coating in a stress corrosion environment according to the present invention;
FIG. 3 is a schematic view of a partial structure of a testing apparatus for a metal protective coating under a stress corrosion environment according to the present invention.
FIG. 4 is a schematic view of the metal protective coating of the parent metal of the testing device for the metal protective coating in a stress corrosion environment according to the present invention;
wherein, the device comprises a base 1, a stress ring 2, a pin 3, a nut 4, a metal protective coating 5, a fixing rod 6, a screw 7 and a base material 8.
Detailed Description
For a better understanding of the objects and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1:
as shown in fig. 1, the method for testing a metal protective coating in a stress corrosion environment disclosed in this embodiment specifically includes the following steps:
y＝πD(D-t)S/4tE (1)
wherein y is the deflection of the stress ring 2, pi is the circumferential rate, E is the elastic modulus, t is the thickness of the stress ring 2, D is the outer diameter of the stress ring 2, and S is the axial tensile stress of the base material 8;
and 7, recording the test data and the result.
As shown in fig. 2, fig. 3 and fig. 4, the testing apparatus for a metal protective coating in a stress corrosion environment disclosed in this embodiment includes: the device comprises a base 1, a stress ring 2, a pin 3, a nut 4, a metal protective coating 5, a fixing rod 6, a screw 7 and a base material 8;
the base 1, the stress ring 2, the pin 3, the nut 4, the fixed rod 6 and the screw 7 are all made of Hastelloy with high corrosion resistance and the mark of C276, and the corrosion in a corrosive medium is ignored;
the screw 7 is connected with the nut 4 and the base 1 through threads and is used for transferring load to the base metal 8 and the metal protective coating 5; the screw 7 is fixedly connected with the fixed rod 6; the base metal 8 and the metal protective coating 5 are fixed on the fixing rod 6 through the pin 3 and are centrally fixed on the stress ring 2 through the fixing rod 6 and the screw 7;
the fixing rod 6 and the nut 4 are used for applying a preload before the metal protective coating 5 is prepared on the surface of the base material 8 and applying a secondary small load after the metal protective coating 5 is prepared on the surface of the base material 8;
the deflection of the stress ring 2 is used to determine the tensile load of the parent metal 8 and the metallic protective coating 5.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A test method of a metal protective coating in a stress corrosion environment is characterized in that: the method comprises the following steps:
step 1, fixing a base material (8) on a stress ring (2) to enable the base material (8) to be aligned to the stress ring (2) in the middle;
step 2, keeping the stress ring (2) upright, fixing the stress ring on the plane of a workbench through a base (1), applying preload to the parent metal (8), measuring the deflection of the stress ring (2) by adopting a deflectometer, and quantifying the load value of the parent metal (8) through a formula (1);
y＝πD(D-t)S/4tE (1)
wherein y is the deflection of the stress ring (2), pi is the circumferential rate, E is the elastic modulus, t is the thickness of the stress ring (2), D is the outer diameter of the stress ring (2), and S is the axial tensile stress of the base material (8);
step 3, preparing a metal protective coating (5) on the surface of the pre-loaded base material (8) to ensure that the metal protective coating (5) completely covers the surface of the base material (8);
step 4, repeating the step 2 on the pre-loaded base material (8) with the surface prepared with the metal protective coating (5), and applying secondary small load again;
step 5, sealing the edge of the residual bare parent metal (8) to ensure that the edge is not soaked in the corrosive medium in the step 6;
step 6, vertically fixing the stress ring (2) loaded with the secondary small load and the parent metal (8) with the surface prepared with the metal protective coating (5) and applied with the secondary small load in a sealed solution tank, and adding a corrosive medium to begin soaking;
and 7, recording the test data and the result.
2. A testing device for a metal protective coating in a stress corrosion environment is used for realizing the testing method for the metal protective coating in the stress corrosion environment as claimed in claim 1, and is characterized in that: the device comprises a base (1), a stress ring (2), a pin (3), a nut (4), a metal protective coating (5), a fixing rod (6), a screw (7) and a base material (8);
the screw (7) is connected with the nut (4) and the base (1) through threads and is used for transferring load to the base material (8) and the metal protective coating (5); the screw rod (7) is fixedly connected with the fixed rod (6); the base material (8) and the metal protective coating (5) are fixed on the fixing rod (6) through the pin (3) and are centrally fixed on the stress ring (2) through the fixing rod (6) and the screw (7);
the fixing rod (6) and the nut (4) are used for applying a preload before the metal protection coating (5) is prepared on the surface of the base material (8) and applying a secondary small load after the metal protection coating (5) is prepared on the surface of the base material (8);
the deflection of the stress ring (2) is used to determine the tensile load of the base material (8) and the metal protective coating (5).
3. The apparatus for testing metal protective coating in stress corrosion environment according to claim 2, wherein: the base (1), the stress ring (2), the pin (3), the nut (4), the fixing rod (6) and the screw (7) are all made of Hastelloy with high corrosion resistance and the mark number of C276, and the corrosion in a corrosive medium is ignored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111609304.4A CN114441306A (en) | 2021-12-24 | 2021-12-24 | Method and device for testing metal protective coating in stress corrosion environment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111609304.4A CN114441306A (en) | 2021-12-24 | 2021-12-24 | Method and device for testing metal protective coating in stress corrosion environment |
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| CN114441306A true CN114441306A (en) | 2022-05-06 |
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| CN202111609304.4A Pending CN114441306A (en) | 2021-12-24 | 2021-12-24 | Method and device for testing metal protective coating in stress corrosion environment |
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|---|---|---|---|---|
| GB2048491A (en) * | 1980-03-17 | 1980-12-10 | Nippon Paint Co Ltd | Method for evaluating corrosion of coated metallic material |
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| JP2011169882A (en) * | 2010-01-22 | 2011-09-01 | Kobe Steel Ltd | Corrosion resistance evaluation method and corrosion fatigue resistance evaluation method for steel material for coating |
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| CN103926146A (en) * | 2014-04-11 | 2014-07-16 | 西南石油大学 | Constant-load stress corrosion testing device of small test sample and testing method thereof |
| CN103926025A (en) * | 2014-04-13 | 2014-07-16 | 北京工业大学 | Test device and method for measuring residual stress of coating |
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-
2021
- 2021-12-24 CN CN202111609304.4A patent/CN114441306A/en active Pending
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