CN109626858B - Composite steel bar rust inhibitor based on long-chain biological nucleic acid and preparation method and application thereof - Google Patents
Composite steel bar rust inhibitor based on long-chain biological nucleic acid and preparation method and application thereof Download PDFInfo
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- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
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- C09D5/08—Anti-corrosive paints
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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
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- C04B2103/61—Corrosion inhibitors
Abstract
The invention discloses a composite steel bar rust inhibitor based on long-chain biological nucleic acid, a preparation method and application thereof, and is characterized in that: the rust inhibitor is formed by uniformly mixing long-chain biological nucleic acid and a sodium phosphate water agent; the sodium phosphate water agent is a commercial sodium phosphate water agent type cathode reinforcing steel bar rust inhibitor. The invention has the beneficial effects that: the composite steel bar rust inhibitor consists of long-chain biological nucleic acid and a sodium phosphate water agent, and a layer of compact protective film is formed on the surface of a steel bar by virtue of a good synergistic effect of two film forming modes, so that anions such as chloride ions are effectively prevented from permeating the surface of the steel bar, the corrosion resistance of the steel bar and the comprehensive corrosion resistance of concrete are improved, the service life of a building can be prolonged, and remarkable economic and social benefits are achieved.
Description
Technical Field
The invention relates to a composite steel bar rust inhibitor based on long-chain biological nucleic acid, a preparation method and application thereof, and belongs to the technical field of building material corrosion prevention.
Background
As an economical and practical structural material, the reinforced concrete is widely applied to structures such as bridges, roads, buildings, dams, submarine tunnels, large-scale ocean platforms and the like. There are many factors affecting the durability of reinforced concrete, wherein the corrosion damage of the steel bar in the concrete is the primary factor, especially in the marine environment and the concrete structure sprayed with deicing salt, the steel bar is easy to be corroded by chlorine salt, and the durability and the service life of the corroded concrete structure are greatly reduced.
In the newly-built reinforced concrete structure, because of the existence of the high-alkalinity pore liquid, a layer of compact passive film can be generated on the surface of the steel bar, and the protective effect is achieved on the steel bar. However, as time goes by, the concrete is carbonized due to the intrusion of CO2, the alkalinity of the concrete pore liquid decreases, and the passive film on the surface of the reinforcing steel bar becomes unstable. Along with the continuous migration of chloride ions into the structure, the steel bars in a plurality of concrete structures are corroded in a short time and even cause the concrete structure to crack along the steel bars, so that the structure safety is damaged, and huge economic loss is brought. Therefore, from the dual viewpoints of economy and safety, it is very important to slow down or even eliminate the corrosion of the steel bars in the concrete.
There are many protection methods for preventing the corrosion of the steel bar in the concrete, such as the methods of improving the material and the structure of the concrete, using corrosion resistant steel bars, a cathode protection method, concrete re-alkalization, steel bar coating, steel bar corrosion inhibitor and the like. Among them, the rust inhibitor is widely used in engineering practice because of its simple and economical construction and long-term protection effect on the steel bar. The rust inhibitor is classified into an anode type and a cathode type according to the mechanism of action. Anodic steel reinforcement corrosion inhibitors are capable of preventing or slowing down the anodic process, typically chromates, nitrites, molybdates and the like, which form a "passive film" on the surface of the reinforcement. Nitrite has been used in the early days as a major component of rebar corrosion inhibitors, which have the disadvantage of producing localized and accelerated corrosion at chloride concentrations of a certain extent, and are known as "hazardous" corrosion inhibitors. In addition, the rust inhibitor has the defects of carcinogenesis, alkali-aggregate reaction, slump influence and the like, so that the rust inhibitor is rarely used as the rust inhibitor. The cathode type reinforcing steel bar rust inhibitor can form a film through adsorption, and can prevent or slow down substances in a cathode process, such as zincate, certain phosphates, some organic compounds and the like. Although these substances are not dangerous, they have a low rust-inhibiting effect when used alone. Researchers develop a large amount of mixed rust inhibitors, the mixed rust inhibitors are comprehensive rust inhibitors formed by reasonably matching various substances such as a cathode type, an anode type, an improved resistance type, reduced oxidation and the like, the rust inhibitors are good in rust inhibition effect and low in toxicity, but the synthesis method is difficult and the synthesis process is complex, and most of the rust inhibitors in the prior art are doped during concrete mixing, so that the usage amount is large, and the uniform distribution on the surface of a steel bar cannot be ensured. Therefore, the composite steel bar rust inhibitor has good rust inhibition effect, long action time, simple synthesis method and no toxicity, and has important and wide research prospect.
In addition, an invention patent (CN107032654A) applied by the inventor of the application on 2016, 11, 15 discloses a biological nucleic acid rust inhibitor, a preparation method and application thereof, the biological nucleic acid steel bar rust inhibitor provided by the invention application solves the problems of more consumption, biological toxic action, complex synthesis method, action time and the like of the traditional rust inhibitor, but also has the problem of slightly higher synthesis cost, and the invention application overcomes the defects on the basis of the invention patent application CN 107032654A.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a composite steel bar rust inhibitor based on long-chain biological nucleic acid, a preparation method and application thereof.
In order to achieve the above object, the present invention adopts the following technical solutions:
the composite steel bar rust inhibitor based on the long-chain biological nucleic acid is prepared by uniformly mixing the long-chain biological nucleic acid and a sodium phosphate water aqua, and the components are prepared according to the mass percentage as follows:
4 to 10 percent of long-chain biological nucleic acid,
90-96% of sodium phosphate water agent.
According to the composite steel bar corrosion inhibitor based on the long-chain biological nucleic acid, the sodium phosphate aqueous solution is a commercial sodium phosphate aqueous solution cathode steel bar corrosion inhibitor.
The composite steel bar rust inhibitor based on the long-chain biological nucleic acid comprises a solvent and deoxyribonucleic acid dissolved in the solvent, wherein the solvent is water or a solution.
The long-chain biological nucleic acid-based composite steel bar rust inhibitor is prepared from the deoxyribonucleic acid with the length of 10000-1000000 bases or a mixture thereof.
The structure of the deoxyribonucleic acid is a linear structure, a ring structure, a single-chain structure, a double-chain structure or a single-double-chain mixed structure.
The deoxyribonucleic acid is composed of four bases including guanine (G), thymine (T), adenine (A) and cytosine (C) in sequence, and has a specific base sequence or a mixture of a plurality of base sequences.
The concentration of the deoxyribonucleic acid is 0.05 mg/L-100 mg/L.
The composite steel bar rust inhibitor based on the long-chain biological nucleic acid is a buffer solution consisting of Tris-C1 and EDTA or other solutions or buffer solutions capable of dissolving nucleic acid.
The preparation method of the composite steel bar rust inhibitor based on the long-chain biological nucleic acid comprises the following steps: dissolving deoxyribonucleic acid as solute in water or solution, mixing and stirring uniformly to obtain the product.
The composite steel bar rust inhibitor based on the long-chain biological nucleic acid is directly coated on the surface of a steel bar or is mixed with concrete in the form of an additive when the concrete is mixed.
The basic principle of the invention is as follows: according to the corrosion mechanism of steel bars in concrete and the action mechanism of the rust inhibitor, different rust inhibitors can form different covering films on the surfaces of the steel bars, and further corrosion is controlled by inhibiting the anode reaction or the cathode reaction of the electrochemical reaction of steel bar corrosion. In the invention, in the early stage of corrosion, phosphate radicals in the sodium phosphate water-type cathode steel bar corrosion inhibitor react with Ca (OH)2 in a concrete pore solution to generate apatite, phosphate radicals in long-chain biological nucleic acid have strong electron supply capacity and can be combined with a d-empty orbit of Fe on the surface of a steel bar to form a bond, and both the phosphate radicals and the d-empty orbit can form a firm film on the surface of the steel bar to inhibit the corrosion of a steel bar electrode, so the corrosion inhibitor is heavier than the cathode reaction for inhibiting the corrosion of the electrode. And in the later stage of corrosion, along with the continuous progress of corrosion, the rust inhibitor is constantly consumed, and the film that covers on the reinforcing bar surface is constantly destroyed for the rust inhibitor can only be emphatically adsorbed in the more active place of reinforcing bar electrode reaction, mainly plays the anodic reaction process that causes electrochemical reaction. The invention makes full use of the reaction of phosphate radical in the commercial sodium phosphate water-based cathode steel bar corrosion inhibitor and Ca (OH)2 in the concrete pore solution and the combination effect of the series repeated phosphate radical on the nucleic acid skeleton and Fe on the surface of the steel bar, and the good synergistic effect of the two film forming modes ensures that a layer of compact protective film is formed on the surface of the steel bar, thereby effectively preventing anions such as chloride ions from permeating the surface of the steel bar, improving the corrosion resistance of the steel bar and the comprehensive corrosion resistance of the concrete, prolonging the service life of buildings and having remarkable economic and social benefits.
According to the scheme, the composite steel bar corrosion inhibitor added with the long-chain biological nucleic acid has a remarkable corrosion inhibition effect, after the composite steel bar corrosion inhibitor is added into saturated Ca (OH)2 simulated polluted concrete pore liquid containing 0.5mol/L NaCl, compared with two cases of only adding the sodium phosphate water-based cathode steel bar corrosion inhibitor and not adding the steel bar corrosion inhibitor, the corrosion speed is obviously reduced, the capacitive arc resistance radius of electrochemical impedance is obviously increased, the dynamic potential polarization curve breakdown potential is shifted forward, and the range of a stable passivation region is widened.
Defining: the long-chain biological nucleic acid in the invention refers to deoxyribonucleic acid contained in the long-chain biological nucleic acid, wherein the deoxyribonucleic acid is 10000-1000000 bases in length, or a mixture thereof.
Because the number of the base groups in the long-chain biological nucleic acid is 10000-1000000, the agglomeration phenomenon of the deoxyribonucleic acid of the macromolecules mentioned in paragraph 0016 of the specification of the invention patent application CN107032654A (patent name: a biological nucleic acid rust inhibitor, and the preparation method and application) can be ignored, and the specific reasons are as follows:
the long-chain biological nucleic acid corrosion inhibitor has a reasonable mixing range, can be well and uniformly mixed with a sodium phosphate water aqua, and can be uniformly distributed in the composite steel bar corrosion inhibitor instead of 100 percent. In the test process, in the initial stage, the long-chain biological nucleic acid and the sodium phosphate water agent are dissolved in the concrete pore liquid and distributed on the surface of the reinforcing steel bar; in the middle and later periods of the test, long-chain biological nucleic acid in the composite steel bar rust inhibitor can generate a certain degree of agglomeration, but phosphate radical leaked from the agglomerated outer surface can be combined with a d-hollow orbit of Fe on the surface of the steel bar to form a bond, and because the content of the long-chain biological nucleic acid is not very high, a very large cluster cannot be formed, the effective phosphate radical is still higher than the short-chain biological nucleic acid under the same concentration. In addition, generally, nucleic acids extracted from organisms are macromolecular long-chain nucleic acids, the material can be directly obtained from waste materials of factories, short-chain biological nucleic acids need to be artificially synthesized, and the long-chain biological nucleic acids have certain advantages in terms of cost.
The invention achieves the following beneficial effects:
(1) the invention provides a composite steel bar corrosion inhibitor consisting of long-chain biological nucleic acid and a sodium phosphate aqueous solution, which makes full use of the reaction of phosphate radicals in a commercial sodium phosphate aqueous cathode steel bar corrosion inhibitor and Ca (OH)2 in a concrete pore solution and the combined action of series repeated phosphate radicals on a nucleic acid skeleton and Fe on the surface of a steel bar, and has good synergistic effect of two film forming modes, so that a layer of compact protective film is formed on the surface of the steel bar, thereby effectively preventing anions such as chloride ions from permeating the surface of the steel bar, improving the corrosion resistance of the steel bar and the comprehensive corrosion resistance of concrete, prolonging the service life of a building and having remarkable economic and social benefits.
(2) Compared with the prior art, the composite steel bar rust inhibitor added with the long-chain biological nucleic acid, which is prepared by the invention, solves the problems that the traditional rust inhibitor has a biological toxic effect, is complex in synthesis method, short in action time and the like, and has negative effects on reinforced concrete. The method has the advantages of simple synthesis method, strong affinity with the steel bar, good adaptability with concrete, no toxicity, good environmental protection, easy production, no adverse effect, long action time, effective inhibition and slowing of the corrosion of the steel bar and the like.
Drawings
FIG. 1 is a Nyquist plot of the Electrochemical Impedance Spectroscopy (EIS) of steel bars doped with a composite steel bar rust inhibitor added with 4% long-chain biological nucleic acid, a sodium phosphate water-based cathode steel bar rust inhibitor and no steel bar rust inhibitor in a saturated Ca (OH)2 solution containing 0.5mol/L NaCl; the curve (a) is a composite steel bar corrosion inhibitor added with 4% of long-chain biological nucleic acid, the curve (b) is a cathode steel bar corrosion inhibitor added with sodium phosphate water, and the curve (c) is a steel bar corrosion inhibitor not added.
FIG. 2 is a zeta potential polarization curve of a composite steel bar corrosion inhibitor added with 4% long-chain biological nucleic acid, a cathode steel bar corrosion inhibitor added with sodium phosphate water and no steel bar corrosion inhibitor added in a saturated Ca (OH)2 solution containing 0.5mol/L NaCl; the curve (a) is a composite steel bar corrosion inhibitor added with 4% of long-chain biological nucleic acid, the curve (b) is a cathode steel bar corrosion inhibitor added with sodium phosphate water, and the curve (c) is a steel bar corrosion inhibitor not added.
FIG. 3 is a Nyquist plot of the Electrochemical Impedance Spectroscopy (EIS) of steel bars doped with 6% long-chain biological nucleic acid, sodium phosphate water-based cathode steel bar rust inhibitor and no steel bar rust inhibitor in a saturated Ca (OH)2 solution containing 0.5mol/L NaCl; the curve (a) is a composite steel bar corrosion inhibitor added with 6% of long-chain biological nucleic acid, the curve (b) is a cathode steel bar corrosion inhibitor added with sodium phosphate water, and the curve (c) is a steel bar corrosion inhibitor not added.
FIG. 4 is a Nyquist plot of the Electrochemical Impedance Spectroscopy (EIS) of steel bars doped with 8% long-chain biological nucleic acid, sodium phosphate water-based cathode steel bar rust inhibitor and no steel bar rust inhibitor in a saturated Ca (OH)2 solution containing 0.5mol/L NaCl; the curve (a) is a composite steel bar corrosion inhibitor added with 8% of long-chain biological nucleic acid, the curve (b) is a cathode steel bar corrosion inhibitor added with sodium phosphate water, and the curve (c) is a steel bar corrosion inhibitor not added.
FIG. 5 is a Nyquist plot of the Electrochemical Impedance Spectroscopy (EIS) of steel bars doped with 10% long-chain biological nucleic acid, sodium phosphate water-based cathode steel bar rust inhibitor and no steel bar rust inhibitor in a saturated Ca (OH)2 solution containing 0.5mol/L NaCl; the curve (a) is a composite steel bar corrosion inhibitor added with 10% of long-chain biological nucleic acid, the curve (b) is a cathode steel bar corrosion inhibitor added with sodium phosphate water, and the curve (c) is a steel bar corrosion inhibitor not added.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The composite steel bar rust inhibitor based on the long-chain biological nucleic acid comprises the following components in percentage by mass: 96% of sodium phosphate water-based cathode reinforcing steel bar rust inhibitor and 4% of long-chain biological nucleic acid rust inhibitor. The composite steel bar rust inhibitor is prepared by the following method: weighing the components according to the mass percentage, mixing and uniformly stirring to obtain the composition.
According to the technical scheme, a steel bar section with the diameter of 10mm and the length of 2cm is selected as a working electrode. Before the experiment, 200#, 600#, 1000# and 1200# metallographic abrasive paper are used for polishing the steel bars step by step in sequence. And taking one end of the steel bar section as a working surface, connecting the other end of the steel bar section with a copper wire, wrapping the side surface of the steel bar section with epoxy resin, and polishing the working surface into a mirror surface by using a polishing machine to obtain the required steel bar working electrode. Cleaning with acetone and deionized water, drying, and placing into a drying dish for later use.
The Electrochemical Impedance Spectroscopy (EIS) and the potentiodynamic polarization of the steel bar in a composite steel bar corrosion inhibitor added with 4 percent of long-chain biological nucleic acid, a cathode steel bar corrosion inhibitor added with sodium phosphate water and a saturated Ca (OH)2 solution containing 0.5mol/L NaCl without adding the steel bar corrosion inhibitor are respectively tested.
As can be seen from fig. 1, after the composite steel bar rust inhibitor added with 4% of long-chain biological nucleic acid is added, compared with the two cases of only adding the sodium phosphate aqueous solution type cathode steel bar rust inhibitor and not adding the steel bar rust inhibitor, the fitting radius of the Nyquist diagram is obviously increased, and through EIS data fitting analysis, the steel bar passivation and adsorption film is obviously increased, which indicates that the corrosion resistance of the steel bar is enhanced after the composite steel bar rust inhibitor is added.
As can be seen from FIG. 2, the corrosion current density of the system added with the composite steel bar rust inhibitor added with 4% of the long-chain biological nucleic acid is reduced by about one order of magnitude compared with the system added with the sodium phosphate water-based cathode steel bar rust inhibitor without the long-chain biological nucleic acid. Meanwhile, the corrosion potential of the steel bar electrode is obviously shifted forwards by 0.05-0.1 v, which shows that the composite steel bar corrosion inhibitor is mainly adsorbed at a place where the steel bar electrode is more active in reaction, so that the anode reaction process of electrochemical reaction is mainly inhibited, and the corrosion resistance of the steel bar is improved.
Example 2
The composite steel bar rust inhibitor based on the long-chain biological nucleic acid comprises the following components in percentage by mass: 94% of sodium phosphate water-based cathode reinforcing steel bar rust inhibitor and 6% of long-chain biological nucleic acid rust inhibitor. The composite steel bar rust inhibitor is prepared by the following method: weighing the components according to the mass percentage, mixing and uniformly stirring to obtain the composition.
According to the technical scheme, a steel bar section with the diameter of 10mm and the length of 2cm is selected as a working electrode. Before the experiment, 200#, 600#, 1000# and 1200# metallographic abrasive paper are used for polishing the steel bars step by step in sequence. And taking one end of the steel bar section as a working surface, connecting the other end of the steel bar section with a copper wire, wrapping the side surface of the steel bar section with epoxy resin, and polishing the working surface into a mirror surface by using a polishing machine to obtain the required steel bar working electrode. Cleaning with acetone and deionized water, drying, and placing into a drying dish for later use.
Testing the Electrochemical Impedance Spectrum (EIS) of the steel bar in a saturated Ca (OH)2 solution containing 0.5mol/L NaCl, wherein the composite steel bar rust inhibitor added with 6% of long-chain biological nucleic acid, the sodium phosphate water-based cathode steel bar rust inhibitor and the steel bar rust inhibitor not added are mixed in the steel bar.
As can be seen from fig. 3, after the composite steel bar rust inhibitor added with 6% of long-chain biological nucleic acid is added, compared with the two cases of only adding the sodium phosphate aqueous solution type cathode steel bar rust inhibitor and not adding the steel bar rust inhibitor, the impedance arc is significantly increased, and the rust inhibition efficiency is improved, which indicates that the corrosion resistance of the steel bar is enhanced after the composite steel bar rust inhibitor is added.
Example 3
The composite steel bar rust inhibitor based on the long-chain biological nucleic acid comprises the following components in percentage by mass: the sodium phosphate water agent type cathode reinforcing steel bar rust inhibitor is 92 percent, and the long-chain biological nucleic acid rust inhibitor is 8 percent. The composite steel bar rust inhibitor is prepared by the following method: weighing the components according to the mass percentage, mixing and uniformly stirring to obtain the composition.
According to the technical scheme, a steel bar section with the diameter of 10mm and the length of 2cm is selected as a working electrode. Before the experiment, 200#, 600#, 1000# and 1200# metallographic abrasive paper are used for polishing the steel bars step by step in sequence. And taking one end of the steel bar section as a working surface, connecting the other end of the steel bar section with a copper wire, wrapping the side surface of the steel bar section with epoxy resin, and polishing the working surface into a mirror surface by using a polishing machine to obtain the required steel bar working electrode. Cleaning with acetone and deionized water, drying, and placing into a drying dish for later use.
Testing the Electrochemical Impedance Spectrum (EIS) of the steel bar in a saturated Ca (OH)2 solution containing 0.5mol/L NaCl, wherein the composite steel bar rust inhibitor added with 8% of long-chain biological nucleic acid, the sodium phosphate water-based cathode steel bar rust inhibitor and the non-steel bar rust inhibitor are doped in the steel bar.
As can be seen from fig. 4, after the composite steel bar corrosion inhibitor added with 8% of the long-chain biological nucleic acid is added, the impedance arc is increased compared with the two cases of only adding the sodium phosphate aqueous solution type cathode steel bar corrosion inhibitor and not adding the steel bar corrosion inhibitor, which indicates that the corrosion resistance of the steel bar is enhanced after the composite steel bar corrosion inhibitor is added.
Example 4
The composite steel bar rust inhibitor based on the long-chain biological nucleic acid comprises the following components in percentage by mass: 90% of sodium phosphate water-based cathode reinforcing steel bar rust inhibitor and 10% of long-chain biological nucleic acid rust inhibitor. The composite steel bar rust inhibitor is prepared by the following method: weighing the components according to the mass percentage, mixing and uniformly stirring to obtain the composition.
According to the technical scheme, a steel bar section with the diameter of 10mm and the length of 2cm is selected as a working electrode. Before the experiment, 200#, 600#, 1000# and 1200# metallographic abrasive paper are used for polishing the steel bars step by step in sequence. And taking one end of the steel bar section as a working surface, connecting the other end of the steel bar section with a copper wire, wrapping the side surface of the steel bar section with epoxy resin, and polishing the working surface into a mirror surface by using a polishing machine to obtain the required steel bar working electrode. Cleaning with acetone and deionized water, drying, and placing into a drying dish for later use.
Testing the Electrochemical Impedance Spectrum (EIS) of the steel bar in a saturated Ca (OH)2 solution containing 0.5mol/L NaCl, wherein the composite steel bar rust inhibitor added with 10% of long-chain biological nucleic acid, the sodium phosphate water-based cathode steel bar rust inhibitor and the steel bar rust inhibitor which is not added are mixed in the steel bar.
As can be seen from fig. 5, after the composite steel bar rust inhibitor added with 10% of long-chain biological nucleic acid is added, the impedance arc is increased compared with the two cases of only adding the sodium phosphate aqueous solution type cathode steel bar rust inhibitor and not adding the steel bar rust inhibitor, which indicates that after the composite steel bar rust inhibitor is added, the rust inhibition efficiency is improved, and the corrosion resistance of the steel bar is enhanced.
In summary, the invention provides a composite steel bar rust inhibitor added with long-chain biological nucleic acid, which is formed by uniformly mixing a sodium phosphate water-based cathode steel bar rust inhibitor and a long-chain biological nucleic acid rust inhibitor, and the components are prepared according to the mass percentage as follows: 90-96% of sodium phosphate water-based cathode reinforcing steel bar rust inhibitor and 4-10% of long-chain biological nucleic acid rust inhibitor. Compared with the existing rust inhibitor, the composite steel bar rust inhibitor added with the long-chain biological nucleic acid has the advantages of simple synthesis method, strong affinity with steel bars, no toxicity, good environmental protection property, easiness in production, no adverse effect, long action time, capability of effectively inhibiting and slowing down the corrosion of the steel bars and the like. The method can be widely used in reinforced concrete structures such as bridges, roads, buildings, dams, submarine tunnels, large ocean platforms and the like.
It should be noted that: the embodiment of the invention is described in detail in the attached drawings by taking a saturated Ca (OH)2 solution containing 0.5mol/L NaCl as an example, because the concentration of the chloride ions in the environment of the steel bars is increased along with the time in the process of steel bar corrosion. In the test, in order to simulate the state of the steel bar corrosion, Cl-is added in a NaCl form from 0.01mol/L step by step according to a gradient, and the steel bar corrosion is serious when the concentration of NaCl reaches 0.5 mol/L. However, under the concentration, the composite steel bar rust inhibitor has an obvious rust inhibiting effect, and the composite steel bar rust inhibitor can effectively inhibit and slow down the corrosion of steel bars compared with the existing steel bar rust inhibitor, and has the advantages of simple synthesis method, strong affinity with the steel bars, no toxicity, good environmental protection, easy production, no adverse effect, long action time and the like.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The composite steel bar rust inhibitor based on the long-chain biological nucleic acid is characterized in that: the rust inhibitor is prepared by uniformly mixing long-chain biological nucleic acid and a sodium phosphate water aqua, and the components are prepared according to the mass percentage as follows:
4 to 10 percent of long-chain biological nucleic acid,
90-96% of sodium phosphate water agent.
2. The composite steel bar rust inhibitor based on long-chain biological nucleic acid as claimed in claim 1, which is characterized in that: the sodium phosphate water agent is a commercial sodium phosphate water agent type cathode reinforcing steel bar rust inhibitor.
3. The compound steel bar rust inhibitor based on long-chain biological nucleic acid as claimed in claim 1 or 2, which is characterized in that: the long-chain biological nucleic acid comprises a solvent and deoxyribonucleic acid dissolved in the solvent, and the solvent is water or a solution; the solution is a buffer consisting of Tris-C1 and EDTA or other solutions capable of dissolving nucleic acid.
4. The composite steel bar rust inhibitor based on long-chain biological nucleic acid as claimed in claim 3, wherein: the deoxyribonucleic acid is 10000-1000000 bases in length or a mixture thereof.
5. The composite steel bar rust inhibitor based on long-chain biological nucleic acid as claimed in claim 3, wherein: the structure of the deoxyribonucleic acid is a linear structure, a circular structure, a single-chain structure, a double-chain structure or a single-double-chain mixed structure.
6. The composite steel bar rust inhibitor based on long-chain biological nucleic acid as claimed in claim 3, wherein: the deoxyribonucleic acid is composed of four bases including guanine (G), thymine (T), adenine (A) and cytosine (C) in sequence, and has a specific base sequence or a mixture of a plurality of base sequences.
7. The composite steel bar rust inhibitor based on long-chain biological nucleic acid as claimed in claim 3, wherein: the concentration of the deoxyribonucleic acid is 0.05 mg/L-100 mg/L.
8. The preparation method of the long-chain biological nucleic acid-based composite steel bar rust inhibitor according to any one of claims 4 to 7, characterized by comprising the following steps: dissolving deoxyribonucleic acid as solute in water or solution, mixing and stirring uniformly to obtain the product.
9. The application of the long-chain biological nucleic acid-based composite steel bar rust inhibitor in the rust inhibition of reinforced concrete according to any one of claims 4 to 7, wherein the long-chain biological nucleic acid-based composite steel bar rust inhibitor comprises the following components in percentage by weight: the composite steel bar rust inhibitor is directly coated on the surface of a steel bar or is mixed into the steel bar in the form of an additive during concrete mixing.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86104445A (en) * | 1986-06-21 | 1987-12-30 | 苏永廉 | A kind of inhibiter that prevents steel corrosion |
| CN107032654A (en) * | 2016-11-15 | 2017-08-11 | 河海大学 | A kind of biotinylated nucleic acid corrosion inhibitor and preparation method and application |
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2018
- 2018-11-30 CN CN201811453640.2A patent/CN109626858B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86104445A (en) * | 1986-06-21 | 1987-12-30 | 苏永廉 | A kind of inhibiter that prevents steel corrosion |
| CN107032654A (en) * | 2016-11-15 | 2017-08-11 | 河海大学 | A kind of biotinylated nucleic acid corrosion inhibitor and preparation method and application |
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