CN116606070A - Anti-corrosion glass coating, preparation method and application - Google Patents
Anti-corrosion glass coating, preparation method and application Download PDFInfo
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- CN116606070A CN116606070A CN202310601086.2A CN202310601086A CN116606070A CN 116606070 A CN116606070 A CN 116606070A CN 202310601086 A CN202310601086 A CN 202310601086A CN 116606070 A CN116606070 A CN 116606070A
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- 238000000576 coating method Methods 0.000 title claims abstract description 120
- 239000011248 coating agent Substances 0.000 title claims abstract description 115
- 238000005260 corrosion Methods 0.000 title claims abstract description 43
- 239000011521 glass Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 59
- 239000002184 metal Substances 0.000 claims abstract description 59
- 239000000843 powder Substances 0.000 claims abstract description 31
- 239000003792 electrolyte Substances 0.000 claims abstract description 20
- 230000007797 corrosion Effects 0.000 claims abstract description 18
- 239000004927 clay Substances 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 238000005245 sintering Methods 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 239000004115 Sodium Silicate Substances 0.000 claims description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 15
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 14
- 239000003921 oil Substances 0.000 claims description 11
- 239000006255 coating slurry Substances 0.000 claims description 10
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 10
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000292 calcium oxide Substances 0.000 claims description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 8
- 239000000378 calcium silicate Substances 0.000 claims description 8
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 8
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 235000012239 silicon dioxide Nutrition 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 239000004317 sodium nitrate Substances 0.000 claims description 5
- 235000010344 sodium nitrate Nutrition 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 230000003373 anti-fouling effect Effects 0.000 abstract description 5
- 230000003670 easy-to-clean Effects 0.000 abstract description 2
- 230000002209 hydrophobic effect Effects 0.000 abstract description 2
- 230000000813 microbial effect Effects 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 abstract 2
- 230000001070 adhesive effect Effects 0.000 abstract 2
- 230000032683 aging Effects 0.000 abstract 1
- 238000011109 contamination Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 33
- 230000000052 comparative effect Effects 0.000 description 26
- 239000007789 gas Substances 0.000 description 10
- 238000012546 transfer Methods 0.000 description 9
- 239000010410 layer Substances 0.000 description 8
- 239000003822 epoxy resin Substances 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 229920000647 polyepoxide Polymers 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000032770 biofilm formation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229920006334 epoxy coating Polymers 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000001453 impedance spectrum Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
- C23D5/00—Coating with enamels or vitreous layers
- C23D5/02—Coating with enamels or vitreous layers by wet methods
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The application belongs to the technical field of metal pipeline anti-corrosion coatings used in marine environments, and particularly relates to an anti-corrosion glass coating, a preparation method and application thereof, wherein the anti-corrosion glass coating comprises the following components in parts by weight: 10-15 parts of siliceous oxide, 24-29 parts of clay and 2-7 parts of electrolyte powder. The waterproof adhesive has the advantages of low cost and high adhesive strength with the inner wall of the metal, and is suitable for improving the hydrophobic antifouling and corrosion resistance of the inner wall of the steel pipeline for conveying oil and gas at the seabed. The coating is smooth and easy to clean, can prevent microbial contamination, overcomes the problems of layering stripping and easy aging of the organic coating, and improves the efficiency of conveying oil gas by the submarine pipeline.
Description
Technical Field
The application belongs to the technical field of metal pipeline anti-corrosion coatings used in marine environments, and particularly relates to a preparation method and application of an anti-corrosion glass coating.
Background
Once corrosion perforation occurs on submarine pipelines, oil gas leakage is caused, maintenance is difficult, and serious ecological disasters and economic losses are caused. Thus, there is a need for corrosion protection of subsea pipelines.
The coating serves as a physical barrier to electrolyte penetration and is one of the most effective methods of corrosion inhibition. CoatingLayers have several advantages. First, the inner coating may prevent the fluid or gas from interacting and reacting with the pipe metal. Second, the coated steel tubing reduces microbial deposition and bacterial biofilm formation, helping to shield bacteria. Finally, the inner coating may reduce the pressure of the long distance pipeline, thereby reducing the power required to transport oil and gas. At a Reynolds number of 1×10 7 When the pressure of the coated pipe is 35% less than the pressure of the uncoated pipe. Currently, two-component solvent-borne epoxy coatings, solventless and melt-borne coatings, and polyamide coatings are widely used in crude oil and natural gas pipelines. These coatings are weak in bonding with the steel substrate and are prone to undercoating metal corrosion. It is therefore an urgent problem to develop a coating with high bond strength, smooth surface and high corrosion resistance.
Disclosure of Invention
Based on the problems, the application provides an anti-fouling and anti-corrosion coating with high bonding strength, low thickness and smooth surface and a preparation method thereof.
An anti-corrosive glass coating comprises the following components in parts by weight: 10-15 parts of siliceous oxide, 24-29 parts of clay and 2-7 parts of electrolyte powder.
Preferably, the siliceous oxide is a combination of silicon dioxide and one or two or three of calcium silicate, sodium silicate and calcium oxide.
Preferably, the electrolyte powder is one or a combination of two or three of sodium carbonate, sodium silicate and sodium nitrate.
The preparation method of the anti-corrosion glass coating comprises the following steps:
1) Preparing coating powder: grinding siliceous oxide, clay and electrolyte powder, sieving with 150-300 mesh sieve, and mixing and stirring;
2) Preparing coating slurry: mixing and stirring 10-20 parts of coating powder with 20-40 parts of deionized water to obtain the coating powder;
3) Primary drying of the coating: spraying the coating slurry on the inner wall of a metal pipeline, drying at 140-150 ℃, and removing moisture in the coating;
4) And (3) sintering and solidifying the coating: and 3) placing the dried metal pipeline with the coating in the step 3) into a high-temperature furnace at 715-815 ℃ for sintering, and rapidly cooling to room temperature after the sintering is finished, wherein a glass coating is formed on the metal pipeline.
Preferably: the siliceous oxide is the combination of silicon dioxide and one or two or three of calcium silicate, sodium silicate and calcium oxide.
Preferably: the electrolyte powder is one or the combination of two or three of sodium carbonate, sodium silicate and sodium nitrate.
An application of an anti-corrosion glass coating is disclosed, wherein the glass coating in claim 4 is coated on the inner wall of a metal pipeline for conveying oil gas at the sea bottom, the metal pipeline is dried at 140-150 ℃, the water in the coating is removed, the metal pipeline is placed in a high-temperature furnace at 715-815 ℃ for sintering, and the metal pipeline is rapidly cooled to room temperature after the sintering is finished, at the moment, the glass coating is formed on the inner wall of the metal pipeline for conveying oil gas steel at the sea bottom; the thickness of the glass coating is 200-230 mu m.
Preferably: the bonding strength between the glass coating and the inner wall of the metal pipeline for conveying oil gas at the bottom of the sea is 15-18MPa.
Compared with the prior art, the application has the following beneficial effects:
(1) The bonding strength is high, and the bonding strength between the anti-corrosion glass coating and the inner wall of the oil-gas steel pipe can reach more than 16 MPa;
(2) The corrosion prevention effect is good, after the coated metal pipeline test piece is soaked in 3.5 mass percent sodium chloride solution for 3 months, a scanning electron microscope is used for observation, and the surface of the coating has no corrosion points and corrosion pits;
(3) The hydrophobic property is good, and the roughness of the coating is only 0.85 micrometers when the coating is observed by a scanning electron microscope;
(4) The coating is suitable for the inner wall of a pipeline, the thickness of the coating is only 200-230 microns, and the flow rate of oil gas conveyed by the pipeline can be effectively improved;
(5) Good corrosion resistance, and the charge transfer resistance is of the order of 10 9 An effective capacitance of the double electric layer of the order of 10 -8 The higher charge transfer resistance and the lower effective capacitance of the double electric layers show that the coating has better erosion resistance;
(6) The surface is smooth and easy to clean, and microorganism adhesion is not easy to generate;
(7) The coating and the pipeline metal matrix are subjected to chemical reaction in the transition zone, and the iron bulges and is embedded into the coating, so that the bonding strength of the coating and the pipeline is far higher than that of the organic coating, and the common delamination phenomenon of an organic coating-steel interface can not occur.
Drawings
The application will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a macroscopic picture of the coating of example 1.
FIG. 2 shows the surface texture (2500 times) of the coating of the application under a scanning electron microscope.
FIG. 3 shows the surface texture (250 times) of the coating of the application under a scanning electron microscope.
Fig. 4 is a macroscopic picture of the coating of example 2.
Fig. 5 is a macroscopic picture of the coating of example 3.
Detailed Description
In order to better understand the solution of the present application, a technical solution of the embodiment of the present application will be clearly and completely described below, and it is obvious that the described embodiment is only a part of embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
Example 1
The anti-corrosion glass coating comprises the following raw materials in parts by weight: 1000 g of siliceous oxide, 2300 g of clay and 300 g of electrolyte powder, wherein the siliceous oxide, the clay and the electrolyte powder are sieved by a 200-mesh sieve. The siliceous oxide is one or the combination of two or three of silicon dioxide, calcium silicate, sodium silicate and calcium oxide.
The preparation method of the anti-corrosion glass coating comprises the following steps:
1) Preparing coating powder: 1000 g of siliceous oxide (comprising 750 g of silicon dioxide, 150 g of calcium silicate, 40 g of sodium silicate and 60 g of calcium oxide), 2000 g of clay and 200 g of electrolyte powder (100 g of sodium carbonate and 100 g of sodium silicate) are taken, ground and sieved by a 200-mesh sieve, and then mixed and stirred;
2) Preparing coating slurry: mixing and stirring the coating powder with deionized water to obtain a stable suspension;
3) Primary drying of the coating: spraying the coating slurry on the inner wall surface of a metal pipeline, and drying for 10 minutes at 140-150 ℃;
4) And (3) sintering and solidifying the coating: and (3) placing the metal pipeline test piece with the coating in a high-temperature furnace at 715-815 ℃ for sintering for 10 minutes, and then rapidly taking out, and cooling the pipeline to room temperature to obtain the glass coating on the inner surface of the metal pipeline, as shown in figure 1.
Example 2
The anti-corrosion glass coating comprises the following raw materials in parts by weight: 1200 g of siliceous oxide, 2600 g of clay and 400 g of electrolyte powder, wherein the siliceous oxide, the clay and the electrolyte powder are sieved by a 200-mesh sieve.
A preparation method of an anti-fouling and anti-corrosion glass coating with high bonding strength comprises the following steps:
1) Preparing coating powder: 1000 g of siliceous oxide (comprising 810 g of silicon dioxide, 130 g of calcium silicate, 30 g of sodium silicate and 30 g of calcium oxide), 2000 g of clay and 200 g of electrolyte powder (100 g of sodium carbonate and 100 g of sodium silicate) are taken, ground and sieved by a 200-mesh sieve, and then mixed and stirred;
2) Preparing coating slurry: mixing and stirring the coating powder with deionized water to obtain a stable suspension;
3) Primary drying of the coating: spraying the coating slurry on the surface of the inner wall of the metal pipeline, and drying for 10 minutes at 140-150 ℃;
4) And (3) sintering and solidifying the coating: and (3) placing the metal pipeline test piece with the coating in a high-temperature furnace at 715-815 ℃ for sintering for 10 minutes, rapidly taking out, and cooling the pipeline to room temperature to obtain the glass coating on the inner surface of the metal pipeline. As shown in fig. 4.
Example 3
The anti-corrosion glass coating comprises the following raw materials in parts by weight: 1500 g of siliceous oxide, 2700 g of clay and 500 g of electrolyte powder, wherein the siliceous oxide, the clay and the electrolyte powder are sieved by a 200-mesh sieve.
A preparation method of an anti-fouling and anti-corrosion glass coating with high bonding strength comprises the following steps:
1) Preparing coating powder: 1000 g of siliceous oxide (comprising 790 g of silicon dioxide, 120 g of calcium silicate, 50 g of sodium silicate and 40 g of calcium oxide), 2000 g of clay and 200 g of electrolyte powder (50 g of sodium carbonate, 100 g of sodium silicate and 50 g of sodium nitrate) are taken, ground and sieved by a 200-mesh sieve, and then mixed and stirred;
2) Preparing coating slurry: mixing and stirring the coating powder with deionized water to obtain a stable suspension;
3) Primary drying of the coating: spraying the coating slurry on the surface of the inner wall of the metal pipeline, and drying for 10 minutes at 140-150 ℃;
4) And (3) sintering and solidifying the coating: and (3) placing the metal pipeline test piece with the coating in a high-temperature furnace at 715-815 ℃ for sintering for 10 minutes, and rapidly taking out the metal pipeline, and cooling the metal pipeline to room temperature to obtain the coating on the inner surface of the pipeline. As shown in fig. 5.
The application of the anti-corrosion glass coating comprises the steps of coating the glass coating on the inner wall of a metal pipeline for conveying crude oil and natural gas on the sea floor, drying at 140-150 ℃, removing moisture in the coating, sintering in a high-temperature furnace at 715-815 ℃, and rapidly cooling to room temperature after sintering, so that the anti-corrosion glass coating for the oil and gas pipeline on the sea floor can be obtained; the thickness of the glass coating was 220 μm. The bonding strength of the glass coating and the inner wall of the crude oil and natural gas metal pipeline is 15-18MPa.
Comparative example 1
An organic anti-corrosion coating comprises the following raw materials in parts by weight: 1000 g of epoxy resin, directly coating the epoxy resin on the surface of a metal pipeline test piece, and then drying the metal pipeline test piece in air for 3 days to obtain a coating on the surface of the metal pipeline test piece.
Comparative example 2
An organic anti-corrosion coating comprises the following raw materials in parts by weight: 1300 g of epoxy resin, directly brushing the epoxy resin on the surface of a metal pipeline test piece, and then drying the metal pipeline test piece in air for 3 days to obtain a coating on the surface of the metal pipeline test piece.
Comparative example 3
An organic anti-corrosion coating comprises the following raw materials in parts by weight: 1600 g of epoxy resin, directly brushing the epoxy resin on the surface of a metal pipeline test piece, and then drying the metal pipeline test piece in air for 3 days to obtain a coating on the surface of the metal pipeline test piece.
In order to verify the effect of the high-cohesiveness anti-fouling and anti-corrosion glass coating, the caking degree test, the thickness test, the corrosion test and the salt spray corrosion resistance test are respectively carried out.
(1) Bond strength test
Bond strength tests were performed for inventive examples 1-3 and comparative examples 1-3. Test methods referring to ASTM D4541-09, a PosiTest probe was used to test the bond strength between a coating and a metal pipe test piece. The bond strengths of the examples are shown in table 1.
Table 1: bond strength
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Bond Strength (MPa) | 16.85 | 16.93 | 16.79 | 8.02 | 8.07 | 8.16 |
As can be seen from Table 1, the bond strengths of examples 1-3 are generally higher than those of the comparative examples, the average bond strength of examples reaches 16.86MPa, the average bond strength of comparative examples is 8.08MPa, and the average bond strength of examples is improved by 108.7% as compared with the comparative examples. The method is mainly characterized in that under the condition of high-temperature melting, the heavy metals such as chromium, nickel, molybdenum and the like in the siliceous oxide are subjected to chemical reaction with iron and carbon in the pipeline matrix, iron alloy is generated, and the bonding strength between the heavy metals and the iron alloy is enhanced. Meanwhile, as shown in fig. 2, convex anchor points are formed on the surface of the metal substrate and are connected with the siliceous oxide, and the bonding effect further optimizes the space structure between the siliceous oxide and the metal pipeline test piece, reduces the porosity of an interface transition zone and improves the bonding strength. The bond strength between the coating of the application and the metal pipe test piece is significantly higher than in the comparative example.
(2) Thickness test
Thickness tests were performed for examples 1-3 of the present application and comparative examples 1-3, and the thickness of each coating was measured using a coating thickness meter MiniTest 6008, and the respective coating thicknesses are shown in table 2.
Table 2: coating thickness
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Coating thickness (micron) | 230 | 231 | 219 | 289 | 296 | 276 |
As can be seen from Table 2, the thickness of examples 1-3 is generally lower than that of comparative example, the average thickness of examples is 226.7 micrometers, the average thickness of comparative example is 396 micrometers, the average thickness of examples is reduced by 42.8% compared with that of comparative example, mainly because the electrolyte powder can destroy the space structure of the siliceous oxide in the molten state, which not only can reduce the melting point of the siliceous oxide and reduce the preparation cost, but also can reduce the viscosity of the siliceous oxide in high-temperature environment and improve the fluidity of the siliceous oxide, so that the siliceous oxide can uniformly cover the surface of a metal pipe test piece and the phenomena such as local caking and the like can not occur. As shown in FIG. 3, the observation under a 250-time electron microscope shows that the coating uniformly covers the surface of the metal pipeline test piece and the lower surface roughness can effectively improve the oil gas transmission efficiency.
(3) Corrosion resistance test
Anti-corrosion performance tests were performed for examples 1 to 3 and comparative examples 1 to 3 of the present application, examples 1 to 3 and comparative examples 1 to 3 were immersed in a 3.5% sodium chloride solution by mass fraction for 3 months, and then electrochemical impedance spectrum parameters of the examples and comparative examples were recorded.
Table 3: electrochemical parameters of a Metal pipe test piece carrying a glass coating (Ω cm 2)
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Charge transfer resistor | 1.73×10 9 | 2.19×10 9 | 1.27×10 9 | 2.24×10 7 | 2.37×10 7 | 2.91×10 7 |
| Electric double layer effective capacitance | 3.24×10 -8 | 1.13×10 -9 | 1.37×10 -9 | 8.38×10 -7 | 6.34×10 -8 | 8.49×10 -7 |
The charge transfer resistance characterizes the difficulty of electron transfer on the metal surface, and can directly reflect the corrosion resistance of the metal pipeline. As can be seen from Table 3, the charge transfer resistances in the examples are all on the order of 10 9 In the comparative example, the charge transfer resistance is on the order of only 10 7 The charge transfer resistance between the coating and the metal pipeline test piece is obviously improved, which indicates that the corrosion resistance of the metal pipeline test piece is improved.
The electric double layer capacitor also reflects the difficulty of charge transfer, and the smaller the electric double layer capacitor is, the more difficult the charge transfer is. As can be seen from Table 3, the effective capacitance of the double electric layer in the examples is on the order of 10 -9 To 10 -8 The electric double layer capacitance in comparative example was of the order of 10 -8 To 10 -7 It can be seen that the electric double layer capacitance between the coating and the metal pipeline test piece is obviously reduced, which indicates that the corrosion resistance of the metal pipeline test piece is improved.
Claims (8)
1. An anti-corrosive glass coating, characterized by comprising the following components in weight: 10-15 parts of siliceous oxide, 24-29 parts of clay and 2-7 parts of electrolyte powder.
2. The corrosion resistant glass coating according to claim 1, wherein the siliceous oxide is a combination of silica and one or two or three of calcium silicate, sodium silicate, and calcium oxide.
3. The corrosion resistant glass coating according to claim 1, wherein the electrolyte powder is one or a combination of two or three of sodium carbonate, sodium silicate and sodium nitrate.
4. The preparation method of the anti-corrosion glass coating is characterized by comprising the following steps of:
1) Preparing coating powder: grinding siliceous oxide, clay and electrolyte powder, sieving with 150-300 mesh sieve, and mixing and stirring;
2) Preparing coating slurry: mixing and stirring 10-20 parts of coating powder with 20-40 parts of deionized water to obtain the coating powder;
3) Primary drying of the coating: spraying the coating slurry on the inner wall of a metal pipeline, drying at 140-150 ℃ and removing the water in the coating;
4) And (3) sintering and solidifying the coating: and 3) placing the dried metal pipeline with the coating in the step 3) into a high-temperature furnace at 715-815 ℃ for sintering, and rapidly cooling to room temperature after the sintering is finished, wherein a glass coating is formed on the metal pipeline.
5. A method for producing an anti-corrosive glass coating according to claim 3, wherein: the siliceous oxide is the combination of silicon dioxide and one or two or three of calcium silicate, sodium silicate and calcium oxide.
6. A method for producing an anti-corrosive glass coating according to claim 3, wherein: the electrolyte powder is one or the combination of two or three of sodium carbonate, sodium silicate and sodium nitrate.
7. An application of an anti-corrosive glass coating, which is characterized in that: in the preparation process, the glass coating in claim 4 is coated on the inner wall of a metal pipeline for conveying oil and gas at the sea bottom, the metal pipeline is dried at 140-150 ℃, the water in the coating is removed, the metal pipeline is placed in a high-temperature furnace at 715-815 ℃ for sintering, and after the sintering is finished, the metal pipeline is rapidly cooled to room temperature, and the glass coating is formed on the inner wall of the metal pipeline for conveying oil and gas steel at the sea bottom; the thickness of the glass coating is 200-230 mu m.
8. The use of a corrosion resistant glass coating according to claim 7, wherein: the bonding strength between the glass coating and the inner wall of the metal pipeline for conveying oil gas at the bottom of the sea is 15-18MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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