CN115304323A - Conductive mortar and preparation method and application thereof - Google Patents
Conductive mortar and preparation method and application thereof Download PDFInfo
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- CN115304323A CN115304323A CN202210862918.1A CN202210862918A CN115304323A CN 115304323 A CN115304323 A CN 115304323A CN 202210862918 A CN202210862918 A CN 202210862918A CN 115304323 A CN115304323 A CN 115304323A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/12—Electrodes characterised by the material
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/90—Electrical properties
- C04B2111/94—Electrically conducting materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention relates to conductive mortar and a preparation method and application thereof, and relates to the technical field of corrosion and protection of reinforced concrete structures. The conductive mortar comprises cement, quartz sand, water, a sacrificial anode activator and an expanding agent; the weight portion ratio of the quartz sand to the cement is (2.5-4): 1, the weight ratio of cement to water is 1: (0.50-0.70); the sum of the cement and the quartz sand in parts by weight and the ratio of the cement and the quartz sand to the sacrificial anode activator in parts by weight are 100: (2-5), the weight ratio of cement to the expanding agent is 100: (8-15). The conductive mortar has the advantages of strong internal binding power, easiness in forming, small resistivity, promotion of internal ion transmission, small porosity and high ion permeation resistance, so that the sacrificial anode mortar prepared from the conductive mortar has good electrochemical activity, a wire does not need to be welded on the surface of metal, the metal and the sacrificial anode can be electrically connected, and the long-term cathode protection effect on the surface of the metal can be realized.
Description
Technical Field
The invention relates to the technical field of corrosion and protection of reinforced concrete structures, in particular to conductive mortar and a preparation method and application thereof.
Background
As a novel corrosion-resistant reinforcing steel bar, the epoxy coating reinforcing steel bar has wide application in major cross-sea engineering at home and abroad due to excellent chloride ion resistance. However, according to the long-term tracking detection result, the epoxy coating steel bar is easy to have micro defects such as micro holes, damage, scratches and the like on the surface of the coating due to the effects of field carrying, processing, binding and vibrating in the construction process, so that corrosion occurs in advance in the service process of the steel bar, and the theoretical design service life of the epoxy coating steel bar cannot be reached.
Therefore, how to repair the epoxy steel bars corroded at the damaged parts in the concrete is of great importance to guarantee the service life of the structure in service period. However, the preparation method of the sacrificial anode conductive mortar in the prior art has the following defects and inconveniences in the using process:
(1) The sacrificial anode and the concrete are electrically connected by welding or binding a lead on the surface of the steel bar, and the method is troublesome to operate, consumes time and labor in the field use process;
(2) After mortar is required to be prepared on the construction site, the concrete structure is manually filled, so that the operation is inconvenient and the efficiency is low;
(3) The method does not consider that the sacrificial anode mortar has loose internal structure in the use process and increased internal resistance of the mortar even cannot play a role because the sacrificial anode is gradually dissolved in the use process;
(4) The method does not consider that a certain shrinkage expansion difference exists between the existing concrete structure and the repair mortar, and the bonding force between the existing concrete structure and the repair mortar is poor, so that the repair mortar is likely to lose efficacy and fall off;
(5) Meanwhile, when the mortar is acted on common reinforcing steel bars, because the resistance between the reinforcing steel bars is small, the cathode protection effect provided by the sacrificial anode is easily influenced by stray currents of other surrounding reinforcing steel bars, and therefore the actual protection life of the sacrificial anode is easily caused to be less than the requirement of the theoretical design life.
Disclosure of Invention
Aiming at the technical problem, the invention provides a conductive mortar, which comprises the following raw materials: cement, quartz sand, water, a sacrificial anode activator and an expanding agent;
the weight ratio of the quartz sand to the cement is (2.5-4): 1, the weight part ratio of the cement to the water is 1: (0.50-0.70);
the ratio of the total weight of the cement and the quartz sand to the weight of the sacrificial anode activator is 100: (2-5), wherein the weight ratio of the cement to the expanding agent is 100: (8-15).
The conductive mortar prepared by the quartz sand, the cement and the water according to the proportion has the advantages of strong internal binding power, easiness in forming, small resistivity, promotion of internal ion transmission, small porosity and high ion permeation resistance, and further the sacrificial anode mortar prepared by the conductive mortar has good electrochemical activity.
In one embodiment, the conductive mortar comprises the following raw materials in parts by weight:
in one embodiment, the conductive mortar comprises the following raw materials in parts by weight:
because the ash-sand ratio is too low or too high, the internal cohesive force of the mortar is poor, and the mortar is not easy to form, so that the ash-sand ratio (namely the weight ratio of cement to sand) in the conductive mortar is 0.25-0.40; the low water-cement ratio (namely the weight ratio of water to cement) can cause the electrical resistivity of the mortar to be large and influence the internal ion transmission, thereby influencing the electrochemical activity of the sacrificial anode mortar, and the high water-cement ratio can cause the porosity of the conductive mortar to be overlarge and cause the ion permeation resistance of the conductive mortar to be low, so that the water-cement ratio in the conductive mortar is 0.50-0.70. If the doping amount of the sacrificial anode activator is too low, the resistivity of the conductive mortar is higher, the doping amount is too high, bromide ions can easily permeate into the metal surface, the metal corrosion is promoted, and adverse effects are generated; meanwhile, the expansion effect cannot be achieved due to the fact that the content of the expanding agent is too low, and the stress inside the conductive mortar is too large due to the fact that the content of the expanding agent is too high, so that cracks occur in the conductive mortar.
In one embodiment, the sacrificial anode activator comprises at least 1 of the following raw materials: lithium bromide, lithium chloride or lithium nitrate;
the swelling agent comprises at least 2 of the following raw materials: low activity magnesium oxide, calcium oxide or calcium sulphoaluminate; the iodine absorption value measured by the low-activity magnesium oxide is 20-40 mg/g;
the cement comprises at least 1 of the following raw materials: portland cement, ordinary portland cement; the portland cement is 42.5 or 52.5 in grade, and the ordinary portland cement is 42.5 or 52.5 in grade.
The sacrificial anode activator can ensure that the surface of the sacrificial anode mortar obtained by the subsequent preparation of the conductive mortar is always in an activated state, can continuously react and dissolve and emit current, and meanwhile, the sacrificial anode activator also serves as a main ionic conductive medium in the mortar; the calcium oxide or calcium sulphoaluminate in the expanding agent acts on the early stage of hydration of the mortar, so that the adhesive force between the mortar and an existing concrete structure can be ensured within a plurality of days after the mortar is filled, and the low-activity magnesium oxide can act on the mortar for a long time, and the main effect of the low-activity magnesium oxide is to make up the problem that the contact resistance between the interior of the mortar and the sacrificial anode is increased due to the volume loss after the sacrificial anode is consumed; the specific cement can ensure that the mortar has certain strength.
In one embodiment, the expanding agent comprises the following components in parts by weight (2-4): 1, or the low-activity magnesium oxide and the calcium oxide comprise the following components in parts by weight (2-4): 1 low activity magnesium oxide and calcium sulphoaluminate.
The invention also provides a sacrificial anode mortar, which comprises: a sacrificial anode, a gel, a conductive layer and the conductive mortar; the sacrificial anode is inserted into the conductive mortar, gel and a conductive layer are sequentially paved at one end of the conductive mortar close to the sacrificial anode, and the iron core of the sacrificial anode is connected with the conductive layer through a lead.
The sacrificial anode mortar prepared by adopting the raw materials has better electrochemical activity; the gel is made of high water absorption elastic material, and can ensure the ion channel between the metal (such as steel bar) in the concrete and the sacrificial anode mortar. In the using process of the sacrificial anode mortar, a lead is not required to be welded on the surface of the metal, and the metal can be electrically connected with the sacrificial anode mortar through the carbon fibers in the gel and the bottom conductive layer; and the gel and the conductive layer at the bottom of the sacrificial anode mortar can be compressed and deformed under the action of external force, so that the gel can be fully contacted with the damaged part of the metal in the use process of the sacrificial anode mortar.
In one embodiment, the sacrificial anode mortar is cylindrical, and the ratio of the height to the diameter is more than or equal to 1; the sacrificial anode is a cuboid or a cylinder, and when the sacrificial anode is a cuboid, the ratio of the width of the sacrificial anode to the diameter of the sacrificial anode mortar is (0.1-0.3): 1, when the sacrificial anode is a cylinder, the ratio of the diameter of the sacrificial anode to the diameter of the sacrificial anode mortar is (0.1-0.3): 1.
the height and diameter ratio can ensure that the sacrificial anode mortar can work normally.
In one embodiment, the ratio of the thickness of the laid gel to the height of the conductive mortar is (0.1-0.3): 1, the gel comprises a gel substrate, an alkaline solution and an electron conducting medium;
the volume ratio of the mass of the gel base material to the alkaline solution is 80-120 g/L, and the mass of the electronic conducting medium to the volume of the alkaline solution is 10-30 g/L;
the gel base material comprises at least 1 of the following raw materials: agar, methylcellulose gel or polyacrylic gel; the alkaline solution comprises NaOH solution and Ca (OH) 2 A solution or a KOH solution, wherein the concentration of the alkali solution is 0.2mol/L to 0.5mol/L; the electronic conducting medium comprises at least 1 of the following raw materials: carbon fiber, graphene, or carbon powder.
The gel with high water absorption can be prepared by adopting the raw materials, meanwhile, the alkali solution can play a role in re-passivating the metal activation layer in the concrete, and the electronic conductive medium can increase an electronic transmission channel between the sacrificial anode and the reinforcing steel bar.
In one embodiment, the sacrificial anode comprises at least 1 of the following raw materials: a zinc alloy, a magnesium alloy or an aluminum alloy; the conductive layer is conductive carbon fiber cloth, flexible steel wire cloth or fiber cloth containing metal plating.
The invention also provides a preparation method of the sacrificial anode mortar, which comprises the following steps: and pouring the conductive mortar into a mold, inserting the sacrificial anode, adding gel after the conductive mortar is cured, and paving a conductive layer after the gel is cured to obtain the sacrificial anode mortar.
By adopting the preparation method, the gel and the conductive layer can be sequentially laid at the bottom of the sacrificial anode mortar, and the subsequent contact and repair with the damaged part of the metal are facilitated.
The invention also provides a method for preventing metal corrosion, which comprises the steps of paving the sacrificial anode mortar on the surface of the metal, enabling the conductive layer to be in contact with the metal, and enabling the alkali solution in the gel to penetrate into the surface layer of the metal.
By adopting the method, the alkali solution in the gel can permeate into the surface layer of the metal, thereby promoting the re-passivation of the metal. In addition, the method does not need to prepare mortar on site, and only needs to adopt the sacrificial anode mortar prepared in advance to repair the metal.
In one embodiment, the metal is a damaged metal located within the concrete, the method comprising the steps of: drilling concrete to a metal surface layer, removing rust on the metal, filling the sacrificial anode mortar into the hole, pressing the sacrificial anode mortar to enable the falling cushion layer to be in contact with the damaged part of the metal, enabling the gel to penetrate into the damaged part of the metal, and filling the gap between the sacrificial anode mortar and the concrete by adopting sealant or glass.
Compared with the prior art, the invention has the following beneficial effects:
according to the conductive mortar and the preparation method and application thereof, the quartz sand, the cement and the water in a specific ratio are adopted, so that the internal binding force of the conductive mortar is strong, the conductive mortar is easy to form, the resistivity is small, the internal ion transmission is promoted, the porosity is small, and the ion permeation resistance is high. The sacrificial anode mortar prepared by the conductive mortar has good electrochemical activity, and in the use process of the sacrificial anode mortar, the electrical connection between metal and a sacrificial anode can be realized without welding a lead on the surface of the metal, and the long-term cathodic protection effect on the surface of the metal can be realized.
Drawings
FIG. 1 is a sectional view of a sacrificial anode mortar in an embodiment;
FIG. 2 is a diagram of an embodiment of fabricated sacrificial anode mortar for epoxy rebar in an example;
the iron core comprises an iron core 1, a sacrificial anode 2, conductive mortar 3, gel 4, a lead 5, a conductive layer 6, an existing concrete structure 7, epoxy-coated steel bars 8 and epoxy-coated steel bars 9.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Defining:
low-activity magnesium oxide: the active magnesium oxide can be divided into high-activity, active and low-activity magnesium oxide according to the iodine absorption value, and the iodine absorption value of the low-activity magnesium oxide is 20-40 mg/g in the invention.
Ordinary portland cement: according to the regulation of GB175-2007, the hydraulic cementing material is prepared by grinding Portland cement clinker, 5% -20% of mixed materials and a proper amount of gypsum.
The source is as follows:
reagents, materials and equipment used in the embodiment are all commercially available sources unless otherwise specified; unless otherwise specified, all tests are routine in the art.
Examples
An electrically conductive mortar, a sacrificial anode mortar prepared from the electrically conductive mortar and application of the electrically conductive mortar.
1. The preparation method of the conductive mortar is shown as follows.
1. The raw materials were weighed out according to the following formulation table.
TABLE 1 mixing ratio of the raw materials of the conductive mortar (1L material amount required for the conductive mortar)
Note: the mortar resistivity was measured by a four-probe method.
2. Dissolving lithium bromide in the mixing water, and fully dissolving.
3. And (3) mixing and stirring the quartz sand, the cement and the expanding agent for 30-60 s, then pouring the solution obtained in the step (2) and stirring for 2-3 minutes to form the conductive mortar.
2. A sacrificial anode mortar is shown in figure 1, and the preparation method of the sacrificial anode mortar is shown as follows.
1. And (3) pouring the conductive mortar prepared in the step one into a cylindrical mold, inserting the prepared sacrificial anode in the initial setting stage of the mortar, and completely setting the mortar after about 24 hours.
2. 10g of methylcellulose are poured into 100mL of Ca (OH) at a temperature of 70-95 ℃ and a concentration of 0.3mol/L 2 To the solution, thoroughly stirred, and 2g of carbon fiber was poured to obtain a gel. Pouring the gel above the sacrificial anode mortar inserted with the sacrificial anode while the gel is hot, wherein the thickness of the gel layer can be determined according to the height ratio of the sacrificial anode mortar test block, so that the thickness of the gel layer and the conductive sandThe height ratio of the slurry is (0.1-0.3): 1, in this example, approximately 2cm of gel layer was laid flat on the sacrificial anode mortar. Notably, the gel should be laid after the sacrificial anode lead is removed.
3. And after the gel is solidified, placing a layer of conductive carbon fiber cloth above the gel, and electrically connecting the fiber cloth with the lead, so that the preparation of the sacrificial anode mortar is finished.
In order to ensure the water retention property of the gel at the bottom of the sacrificial anode mortar and the expansion property of the mortar, the sacrificial anode mortar is used within 7 days after the preparation.
3. And (5) field installation process.
Due to the fact that emission current and service life of the sacrificial anode in the sacrificial anode mortar are limited, the sacrificial anode mortar prepared in the second step protects epoxy steel bars locally damaged in a splash zone or an atmospheric zone, and the embodiment is shown in fig. 2.
1. The concrete surface is firstly corroded and detected by a steel bar corrosion instrument, and the corrosion condition inside the concrete steel bar is determined.
2. And drilling the external concrete for determining the corrosion of the internal steel bars until reaching the surface layer of the steel bars. And removing rust on the surface layer of the steel bar and washing with fresh water.
3. Filling the prepared sacrificial anode mortar (comprising bottom gel and a conductive layer) into the drilled hole, and slowly pressing the surface of the sacrificial anode mortar to ensure that the conductive layer at the bottom of the mortar is fully contacted with the damaged part of the steel bar, and the solution in the gel is also permeated into the damaged part of the surface of the steel bar to restore the alkaline environment of the surface of the steel bar.
4. And sealing glue or glass cement is used for filling gaps between the mortar and the concrete surface on the surface of the filled sacrificial anode mortar, so that the condition that the contact between the reinforcing steel bar and the surface of the conductive layer is poor due to incomplete hydration process and incomplete function of the expanding agent in the early stage of the sacrificial anode mortar is avoided. After filling, the expansion agent in the mortar plays a role within a plurality of days, and the mortar can be tightly bonded with the existing concrete structure.
Comparative example
The raw materials were weighed out according to the following formulation table.
TABLE 2 raw material mixing ratio of the conductive mortar (1L material amount required for the conductive mortar)
Note: the mortar resistivity was measured by a four-probe method.
In the comparative example, the mortar resistivity measured by the conductive mortar 1 and the conductive mortar 2 is more than 1500 omega cm, which does not meet the requirement of GB/T4950-2002 on the dielectric resistivity.
Examples of the experiments
And detecting the potential change of the steel bar repaired by the sacrificial anode mortar.
The detection method comprises the following steps: JTS/T236-2019 test and detection technical specifications of the concrete of the water transport engineering.
The results are shown in the following table.
TABLE 3 potential Change of Rebar repaired with sacrificial Anode mortar of example
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The conductive mortar is characterized by comprising the following raw materials: cement, quartz sand, water, a sacrificial anode activator and an expanding agent;
the weight ratio of the quartz sand to the cement is (2.5-4): 1, the weight ratio of the cement to the water is 1: (0.50-0.70);
the ratio of the sum of the parts by weight of the cement and the quartz sand to the parts by weight of the sacrificial anode activator is 100: (2-5), wherein the weight ratio of the cement to the expanding agent is 100: (8-15).
2. The conductive mortar of claim 1, wherein the conductive mortar comprises the following raw materials in parts by weight:
3. the electroconductive mortar according to any one of claims 1-2, wherein the sacrificial anode activator comprises at least 1 of the following raw materials: lithium bromide, lithium chloride or lithium nitrate;
the swelling agent comprises at least 2 of the following raw materials: low activity magnesium oxide, calcium oxide or calcium sulphoaluminate; the iodine absorption value measured by the low-activity magnesium oxide is 20-40 mg/g;
the cement comprises at least 1 of the following raw materials: portland cement, ordinary portland cement; the grade of the Portland cement is 42.5 or 52.5, and the grade of the ordinary Portland cement is 42.5 or 52.5.
4. The conductive mortar of claim 3, wherein the expanding agent comprises the following components in parts by weight (2-4): 1, or the low-activity magnesium oxide and the calcium oxide comprise the following components in parts by weight (2-4): 1 low activity magnesium oxide and calcium sulphoaluminate.
5. A sacrificial anode mortar, characterized in that the sacrificial anode mortar comprises: a sacrificial anode, a gel, an electrically conductive layer and the electrically conductive mortar of any one of claims 1-4; the sacrificial anode is inserted into the conductive mortar, gel and a conductive layer are sequentially paved at one end of the conductive mortar close to the sacrificial anode, and the iron core of the sacrificial anode is connected with the conductive layer through a lead.
6. The sacrificial anode mortar of claim 5, wherein the sacrificial anode mortar is cylindrical with a height to diameter ratio of greater than or equal to 1; the sacrificial anode is a cuboid or a cylinder, and when the sacrificial anode is a cuboid, the ratio of the width of the sacrificial anode to the diameter of the sacrificial anode mortar is (0.1-0.3): 1, when the sacrificial anode is a cylinder, the ratio of the diameter of the sacrificial anode to the diameter of the sacrificial anode mortar is (0.1-0.3): 1.
7. the sacrificial anode mortar of claim 5, wherein the ratio of the thickness of the gel pavement to the height of the electrically conductive mortar is (0.1-0.3): 1, the gel comprises a gel substrate, an alkaline solution and an electron conducting medium;
the volume ratio of the mass of the gel base material to the alkaline solution is 80-120 g/L, and the mass of the electronic conducting medium to the volume of the alkaline solution is 10-30 g/L;
the gel base material comprises at least 1 of the following raw materials: agar, methylcellulose gel or polyacrylic gel; the alkaline solution comprises NaOH solution and Ca (OH) 2 A solution or a KOH solution, wherein the concentration of the alkali solution is 0.2mol/L to 0.5mol/L; the electronic conducting medium comprises at least 1 of the following raw materials: carbon fiber, graphene or carbon powder.
8. The sacrificial anode mortar of claim 5, wherein the sacrificial anode comprises at least 1 of the following raw materials: a zinc alloy, a magnesium alloy or an aluminum alloy; the conducting layer is conductive carbon fiber cloth, flexible steel wire cloth or fiber cloth containing metal plating.
9. The process for the preparation of a sacrificial anode mortar of claims 5 to 8, characterized in that it comprises the following steps: and pouring the conductive mortar into a mold, inserting the sacrificial anode, adding gel after the conductive mortar is cured, and paving a conductive layer after the gel is cured to obtain the sacrificial anode mortar.
10. A method of preventing corrosion of a metal, comprising the steps of: laying the sacrificial anode mortar of claims 5-8 on a metal surface, bringing the conductive layer into contact with the metal, while allowing the alkali solution in the gel to penetrate to the metal surface.
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| CN115304323B (en) | 2023-04-25 |
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