CN116448854A - Method for testing dissimilar metal galvanic corrosion behavior under damaged organic coating - Google Patents
Method for testing dissimilar metal galvanic corrosion behavior under damaged organic coating Download PDFInfo
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- CN116448854A CN116448854A CN202210014797.5A CN202210014797A CN116448854A CN 116448854 A CN116448854 A CN 116448854A CN 202210014797 A CN202210014797 A CN 202210014797A CN 116448854 A CN116448854 A CN 116448854A
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- 238000000576 coating method Methods 0.000 title claims abstract description 41
- 239000011248 coating agent Substances 0.000 title claims abstract description 40
- 238000005260 corrosion Methods 0.000 title claims abstract description 40
- 230000007797 corrosion Effects 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 title claims abstract description 21
- 239000002184 metal Substances 0.000 title claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000003792 electrolyte Substances 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 239000013535 sea water Substances 0.000 abstract description 4
- 238000010998 test method Methods 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 229910000975 Carbon steel Inorganic materials 0.000 description 10
- 239000010962 carbon steel Substances 0.000 description 10
- 229910000570 Cupronickel Inorganic materials 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 9
- 238000002791 soaking Methods 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 7
- 238000011160 research Methods 0.000 description 5
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 4
- 229920006334 epoxy coating Polymers 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001453 impedance spectrum Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- ATLAQRSQSGOMOU-UHFFFAOYSA-N niobium platinum Chemical compound [Nb].[Pt] ATLAQRSQSGOMOU-UHFFFAOYSA-N 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
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- Chemical Kinetics & Catalysis (AREA)
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- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a method for testing the corrosion behavior of a dissimilar metal galvanic couple under a damaged organic coating. The test device comprises a computer flat cable, a tow electrode, a reference electrode, an auxiliary electrode and an electrolytic cell, wherein the tow electrode is formed by mixing a plurality of mutually insulated dissimilar metal electrode wires, one end of the tow electrode is connected with an external power supply through the computer flat cable, the other end of the tow electrode is an exposed surface of the tow electrode, the exposed surface of the tow electrode is uniformly coated with an anti-corrosion coating, damage points are formed on the anti-corrosion coating, seawater is arranged in the electrolytic cell, and one end of the tow electrode coated with the anti-corrosion coating, the reference electrode and the auxiliary electrode are immersed in the seawater in the electrolytic cell. The test method can effectively monitor galvanic corrosion.
Description
Technical Field
The invention relates to a method for testing dissimilar metal galvanic corrosion behavior under a damaged organic coating, and belongs to the field of marine material corrosion.
Background
In severe marine corrosion environments, due to the requirements of structural functions, different materials are generally adopted in mechanical structural systems of large marine engineering (such as offshore oil drilling platforms, cross-sea bridges, ships and the like), and the materials can generate galvanic corrosion with different degrees in seawater or humid marine atmosphere, which poses a great threat to the service safety of marine engineering equipment. Therefore, the research on galvanic corrosion of the metallic material of the marine structure can provide basic data and technical basis for the design and material selection and corrosion protection, and has important theoretical significance and economic value.
The application of an organic coating is one of the most common methods of preventing corrosion of metals, and the organic coating prevents contact of the metal substrate with the corrosive medium by physical shielding, thereby preventing the corrosive electrochemical reaction from occurring. To our knowledge, there is relatively little research on the corrosion behavior of dissimilar metals under organic coatings in simulated seawater environments. And the research on the galvanic corrosion behavior under the coating mostly adopts traditional methods such as weightlessness measurement, polarization curve and the like, but the research methods can not obtain local electrochemical information extremely important to the galvanic corrosion behavior under the coating. Moreover, the existing sheet electrode can only obtain electrode surface average information, but cannot obtain electrode local electrochemical information.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for testing the corrosion behavior of a dissimilar metal galvanic couple under a damaged organic coating.
The method for testing the corrosion behavior of the dissimilar metal galvanic couple under the damaged organic coating adopts a test device which comprises a computer flat cable 1, a wire bundle electrode 2, a reference electrode 4, an auxiliary electrode 5, an electrolytic cell 6 and an iron stand 7, wherein the wire bundle electrode 2 is formed by mixing a plurality of mutually insulated dissimilar metal electrode wires, one end of the wire bundle electrode 2 is connected with an external power supply through the computer flat cable 1, the other end is an exposed surface 3 of the wire bundle electrode, the exposed surface 3 of the wire bundle electrode is uniformly coated with an anti-corrosion coating, damage points are formed on the anti-corrosion coating, the electrolytic cell 6 is arranged on the iron stand 7, electrolyte is arranged in the electrolytic cell 6, and one end, which is coated with the anti-corrosion coating, of the wire bundle electrode 2 fixed by the iron stand 7, the reference electrode 4 and the auxiliary electrode 5 are immersed in the electrolyte;
and, comprising the steps of:
(1) Immersing the wire beam electrode 2 in electrolyte, carrying out potential and current distribution test on the wire beam electrode 2 according to the period,
(2) During potential distribution test, all electrode wires are disconnected, and corrosion potential of a single electrode wire relative to the reference electrode 4 is measured in sequence;
during current distribution measurement, the single electrode wires are disconnected from each other, and the galvanic current between the single electrode wires and other electrode wires connected with each other is measured.
According to different experimental requirements, different positions of the anticorrosive coating on the surface of the tow electrode 2 can be damaged, for example, positions of the surface of the heterogeneous electrode wire, the distance between the homogeneous electrode wire and the boundary line, the boundary position and the like are subjected to research on corrosion rules when the different positions are damaged.
The method for testing the corrosion behavior of the dissimilar metal galvanic couple under the damaged organic coating can obtain the local electrochemical information in the corrosion process of the dissimilar metal galvanic couple under the damaged coating and the correlation information of the coating failure and the galvanic corrosion electrochemical parameters in the soaking process, further solves the defect that the sheet electrode can only obtain the electrode surface average information but can not obtain the electrode local electrochemical information, and effectively monitors galvanic corrosion.
Drawings
FIG. 1 is a schematic diagram of a heterogeneous metal galvanic corrosion behavior test apparatus under a damaged organic coating of the present invention.
Fig. 2 is a schematic plan view of the tow electrode 2 according to the present invention.
Fig. 3 is a practical state diagram of the tow electrode 2 according to the present invention.
Fig. 4 is a practical application state diagram of the tow electrode 2 after the broken coating of the present invention.
Fig. 5 is a graph showing the current density distribution after 24 h of the tow electrode dip.
FIG. 6 is an EIS response graph of carbon steel and copper nickel alloy zone coating after 24 h filament bundle electrode dip.
Fig. 7 is a topography of the tow electrode after soaking 330 h.
Wherein, 1-computer winding displacement, 2-silk bundle electrode, 3-silk bundle electrode exposure face, 4-reference electrode, 5-auxiliary electrode, 6-electrolytic cell, 7-iron stand.
Detailed Description
The technical scheme of the invention is further described below with reference to the attached drawings and specific embodiments.
Example 1
The method for testing the corrosion behavior of the dissimilar metal galvanic couple under the damaged organic coating adopts a test device as shown in figure 1, wherein the test device comprises a computer flat cable 1, a tow electrode 2, a reference electrode 4, an auxiliary electrode 5, an electrolytic cell 6 and an iron stand 7, wherein the tow electrode 2 is formed by mixing a plurality of mutually insulated dissimilar metal electrode wires, one end of the tow electrode 2 is connected with an external power supply through the computer flat cable 1, the other end is an exposed surface 3 of the tow electrode, the exposed surface 3 of the tow electrode is uniformly coated with an anti-corrosion coating, damage points are formed on the anti-corrosion coating, the electrolytic cell 6 is arranged on the iron stand 7, electrolyte is arranged in the electrolytic cell 6, and one end, coated with the anti-corrosion coating, of the reference electrode 4 and the auxiliary electrode 5, of the tow electrode 2 fixed by the iron stand 7 are immersed in the electrolyte;
and, comprising the steps of:
(1) Immersing the wire beam electrode 2 in electrolyte, carrying out potential and current distribution test on the wire beam electrode 2 according to the period,
(2) During potential distribution test, all electrode wires are disconnected from each other, and corrosion potential of a single electrode wire relative to the reference electrode 4 is measured in sequence;
during current distribution measurement, the single electrode wires are disconnected from each other, and the galvanic current between the single electrode wires and other interconnected electrode wires is measured.
As shown in fig. 2 and 3, the dissimilar metal wire electrode materials of the wire bundle electrode 2 according to the present embodiment are Q235 carbon steel and B10 copper-nickel alloy, each wire electrode has a diameter of 1.5 mm, and 50 carbon steel wires and 50 copper-nickel alloy wires are sealed in a 10×10 matrix with epoxy resin. The spacing between each wire electrode was 1 mm and insulated from each other. According to the specific positions of 100 electrode wires in the tow electrode 2, the electrode wires are numbered in sequence, wherein 1 # -50 # The electrode is carbon steel electrode 51 # -100 # The electrode is a copper-nickel alloy electrode. Sample surface 800 for filament bundle electrode 2 # The SiC water-grinding sand paper is polished and then washed by deionized water and absolute ethyl alcohol in sequence.
As shown in fig. 4, the epoxy coating was applied to the surface of the wire-beam electrode 2 at one time using a coating rod having a thickness of 150 μm so that the coating thickness was uniform in different areas of the surface of the wire-beam electrode 2. After the epoxy coating is cured at room temperature for 7 days, the hardness of the epoxy coating reaches HB according to the ISO 15184-2012 test method, which shows that the epoxy coating is completely cured. After the coating was completely cured, the thickness of the coating was measured to be 100.+ -. 5. Mu.m, andand 45 of the carbon steel area # The electrode surface coating is completely removed so as to meet the requirement of damaging the coating at the interface of the dissimilar electrodes in the experiment.
The experimental process comprises the following steps:
the wire bundle electrode 2 was immersed in a 3.5. 3.5 wt.% NaCl solution at a temperature of 25 ℃.
The potential current distribution at soaking times of 0.5 h,2 h,6 h, 12 h and 24 h is measured respectively, then every 12 h is measured, and after each measurement, all the electrode wires in the tow electrode 2 are connected together so as to enable electrons to flow freely. The current density distribution after soaking 24 h of the tow electrode is shown in fig. 5.
And respectively carrying out electrochemical impedance spectrum measurement on the carbon steel and copper-nickel alloy regional coating when the soaking time is 0.5 h and 24 h so as to comparatively analyze the change characteristics of the impedance model of the carbon steel and copper-nickel alloy regional coating. The test procedure was as follows: the electrochemical impedance spectrum measurement is carried out under constant potential control under open circuit potential, the amplitude of sine wave signal is 20 mV, and the test frequency range is 10 5 ~10 -2 Hz. The electrolytic cell 6 adopts a classical three-electrode system, the tow electrode 2 is used as a working electrode, the saturated calomel electrode is used as a reference electrode 4, and the platinum-niobium wire is used as an auxiliary electrode 5. Respectively 45 # And coupling the 49 carbon steel wires and the 50 copper-nickel alloy wires outside the electrode together, and then performing electrochemical impedance spectroscopy measurement to obtain the electrochemical impedance spectroscopy of the carbon steel area and the copper-nickel alloy area. The EIS response of the carbon steel and copper nickel alloy zone coating after 24 h tow electrode dip is shown in fig. 6.
And after each soaking period is finished, tracking and shooting macro and micro morphology evolution of the surface of the tow electrode by using a digital camera and a split microscope respectively. The morphology of the tow electrode after soaking 330 h is shown in fig. 7.
The method can obtain the correlation information of the coating failure and the galvanic corrosion electrochemical parameter in the soaking process, effectively monitor galvanic corrosion, and solve the defect that the flaky electrode can only obtain the electrode surface average information, but can not obtain the electrode local electrochemical information.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments. Within the technical conception scope of the invention, a plurality of equivalent changes can be carried out on the technical proposal of the invention, and the equivalent changes belong to the protection scope of the invention.
Claims (1)
1. The method is characterized by adopting a test device which comprises a computer flat cable, a wire bundle electrode, a reference electrode, an auxiliary electrode and an electrolytic cell, wherein the wire bundle electrode is formed by mixing a plurality of mutually insulated dissimilar metal electrode wires, one end of the wire bundle electrode is connected with an external power supply through the computer flat cable, the other end of the wire bundle electrode is an exposed surface of the wire bundle electrode, the exposed surface of the wire bundle electrode is uniformly coated with an anti-corrosion coating, a breakage point is formed on the anti-corrosion coating, electrolyte is arranged in the electrolytic cell, and one end of the wire bundle electrode coated with the anti-corrosion coating, the reference electrode and the auxiliary electrode are immersed in the electrolyte;
and, comprising the steps of:
(1) Immersing the wire beam electrode in electrolyte, carrying out potential and current distribution test on the wire beam electrode according to the period,
(2) During potential distribution test, all electrode wires are disconnected from each other, and corrosion potential of a single electrode wire relative to a reference electrode is measured in sequence;
during current distribution measurement, the single electrode wires are disconnected from each other, and the galvanic current between the single electrode wires and other interconnected electrode wires is measured.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210014797.5A CN116448854A (en) | 2022-01-07 | 2022-01-07 | Method for testing dissimilar metal galvanic corrosion behavior under damaged organic coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210014797.5A CN116448854A (en) | 2022-01-07 | 2022-01-07 | Method for testing dissimilar metal galvanic corrosion behavior under damaged organic coating |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6132593A (en) * | 1998-06-08 | 2000-10-17 | Tan; Yong-Jun | Method and apparatus for measuring localized corrosion and other heterogeneous electrochemical processes |
| CN107860707A (en) * | 2017-11-15 | 2018-03-30 | 上海大学 | The heteropical method of aluminum alloy surface microcell galvanic corrosion is characterized using wire beam electrode |
| CN108827866A (en) * | 2017-11-15 | 2018-11-16 | 上海大学 | The method of the surface of low-carbon steel microcell corrosion characteristics of enamel layer is had been coated with using wire beam electrode characterization |
| CN113155723A (en) * | 2021-04-13 | 2021-07-23 | 中国石油大学(华东) | Testing method of electrode testing system for local corrosion of defect position on surface under flow state |
| CN113720764A (en) * | 2021-09-08 | 2021-11-30 | 上海第二工业大学 | Method for characterizing corrosion behavior of metal surface by using tow electrode |
-
2022
- 2022-01-07 CN CN202210014797.5A patent/CN116448854A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6132593A (en) * | 1998-06-08 | 2000-10-17 | Tan; Yong-Jun | Method and apparatus for measuring localized corrosion and other heterogeneous electrochemical processes |
| CN107860707A (en) * | 2017-11-15 | 2018-03-30 | 上海大学 | The heteropical method of aluminum alloy surface microcell galvanic corrosion is characterized using wire beam electrode |
| CN108827866A (en) * | 2017-11-15 | 2018-11-16 | 上海大学 | The method of the surface of low-carbon steel microcell corrosion characteristics of enamel layer is had been coated with using wire beam electrode characterization |
| CN113155723A (en) * | 2021-04-13 | 2021-07-23 | 中国石油大学(华东) | Testing method of electrode testing system for local corrosion of defect position on surface under flow state |
| CN113720764A (en) * | 2021-09-08 | 2021-11-30 | 上海第二工业大学 | Method for characterizing corrosion behavior of metal surface by using tow electrode |
Non-Patent Citations (1)
| Title |
|---|
| 陆忠海: "人工破损有机涂层下碳钢/铜镍合金偶对在静止和流动海水中的腐蚀行为", 中国优秀硕士学位论文全文数据库工程科技Ⅰ辑(月刊), no. 9, 15 September 2021 (2021-09-15), pages 2 - 3 * |
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