CN112830701A - Environment-friendly composite steel bar rust inhibitor for marine environment and preparation method thereof - Google Patents
Environment-friendly composite steel bar rust inhibitor for marine environment and preparation method thereof Download PDFInfo
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- CN112830701A CN112830701A CN202110254215.6A CN202110254215A CN112830701A CN 112830701 A CN112830701 A CN 112830701A CN 202110254215 A CN202110254215 A CN 202110254215A CN 112830701 A CN112830701 A CN 112830701A
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- environment
- steel bar
- molybdate
- rust inhibitor
- benzotriazole
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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
- 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
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/61—Corrosion inhibitors
Abstract
The invention relates to an environment-friendly composite steel bar rust inhibitor for marine environment and a preparation method thereof, belonging to the technical field of material science and engineering, wherein the steel bar rust inhibitor is prepared by compounding 0.15-0.35 part of molybdate, 0.1-0.65 part of benzotriazole and 100 parts of water. The preparation method comprises the following steps: firstly, weighing molybdate and benzotriazole according to the parts by weight, adding the molybdate and the benzotriazole into an alkaline solution with the pH value of 13.5 at room temperature, and uniformly stirring the mixture by using a glass rod to complete the preparation. According to the invention, molybdate which is harmless to the natural environment and benzotriazole are compounded, so that the harm of a harmful rust inhibitor to the environment is reduced, and the compound rust inhibitor is an environment-friendly compound rust inhibitor. The molybdate and benzotriazole are compounded to generate a synergistic effect, so that the reinforcing steel bar forms an adsorption film in a marine environment, the film has good density, can effectively prevent harmful ions from corroding the surface of the reinforcing steel bar, and has a good rust resistance effect.
Description
Technical Field
The invention belongs to the technical field of material science and engineering, and particularly relates to an environment-friendly composite steel bar rust inhibitor for a marine environment and a preparation method thereof.
Background
The reinforced concrete structure is the most widely used structure in the civil engineering industry at present, and becomes the best choice for engineering construction due to the excellent mechanical property and the relatively low cost. A highly alkaline pore solution (pH is approximately equal to 12.5) can be formed in the fresh concrete, and a stable protective passive film of the reinforcing steel bar can be promoted. However, the steel bar passive film is broken due to chlorine salt corrosion in the marine environment, and local corrosion occurs, so that the concrete member fails, and huge economic loss is caused. Therefore, it is crucial to study how to prevent and delay the corrosion of steel reinforcement in marine environments.
The addition of rust inhibitors is considered to be one of the most effective and simple methods of inhibiting corrosion of steel reinforcement. However, other conventional corrosion inhibitors such as nitrites and chromates, which have been used earlier, are harmful to the human body and have a harmful effect on the ecological environment.
In contrast, molybdate is a corrosion inhibitor which is more environment-friendly and has good corrosion inhibition capability, and can not only form a passivation film containing molybdenum on the surface of the steel bar, but also form a deposition film containing molybdenum with hydration products, and can prevent chloride from corroding the steel bar to cause corrosion. However, the single molybdate is large in usage amount and expensive in price, so that in order to reduce the usage amount and save the cost, a high-efficiency compound rust inhibitor needs to be researched.
Benzotriazole is an organic heterocyclic azole compound and is a recognized copper corrosion inhibitor. The molybdate is used together with molybdate, so that a new adsorption layer with a three-dimensional net structure can be formed on a passivation film and a deposition film which are formed by molybdate and steel bars, the chlorine salt can be effectively prevented from diffusing, and the corrosion of the steel bars is further inhibited.
The invention content is as follows:
the technical problem is as follows: the invention aims to provide an environment-friendly composite steel bar rust inhibitor for marine environment, which can effectively prevent harmful ions from corroding the surface of a steel bar; it is another object of the present invention to provide a method for preparing the same.
The technical scheme is as follows: the invention adopts the following technical scheme:
an environment-friendly composite steel bar rust inhibitor for marine environment comprises the following components in parts by mass: 0.15-0.35 part of molybdate, 0.1-0.65 part of benzotriazole and 100 parts of water.
Further, the molybdate is selected from: sodium molybdate and ammonium molybdate.
Further, the mass ratio of the molybdate to the benzotriazole is 1: 1-1: 5.
further, the mass ratio of the molybdate to the benzotriazole is 1: 3.
further, the preparation method of the environment-friendly composite steel bar rust inhibitor for the marine environment comprises the steps of weighing molybdate and benzotriazole according to the mass parts, adding the molybdate and the benzotriazole into an alkaline solution at room temperature, and stirring to prepare the environment-friendly composite steel bar rust inhibitor.
Further, the pH of the alkaline solution is 13.5.
Further, the room temperature was 25 ℃.
Has the advantages that: compared with the prior art, the invention has the following beneficial effects:
(1) the molybdate which is harmless to the natural environment and benzotriazole are compounded, so that the harm of a harmful rust inhibitor to the environment is reduced, and the compound rust inhibitor is green and environment-friendly;
(2) the molybdate and the benzotriazole are compounded to generate a synergistic effect, so that the reinforcing steel bar forms an adsorption film in a marine environment, the film has good density, can effectively prevent harmful ions from corroding the surface of the reinforcing steel bar, has a good rust resistance effect, and has a mass ratio of 1:3, the rust resistance efficiency is the best, and can reach 72 percent;
(3) simple preparation, low cost and convenient industrial production.
Drawings
FIG. 1 is an electrochemical impedance spectrogram of a steel bar after the corrosion inhibitor is soaked in a marine environment for 1 hour;
FIG. 2 is a potentiodynamic cyclic polarization diagram of a steel bar after the corrosion inhibitor of the invention is soaked in a marine environment for 1 hour;
FIG. 3 is a graph of corrosion inhibition efficiency of steel bars after the corrosion inhibitor of the present invention is soaked in a marine environment for 1 hour;
FIG. 4 is an optical microscope photograph of the steel bar after the rust inhibitor of example 1 is soaked in the marine environment for 1 hour;
FIG. 5 is an optical microscope photograph of the steel bar after the corrosion inhibitor of example 2 is soaked in the marine environment for 1 hour;
FIG. 6 is an optical microscope photograph of the steel bar after the corrosion inhibitor of example 4 is soaked in the marine environment for 1 h.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The environment-friendly composite steel bar corrosion inhibitor for the marine environment and the preparation method thereof are compounded by molybdate and benzotriazole, wherein the components comprise, by mass, 0.15-0.35 part of molybdate, 0.1-0.65 part of benzotriazole and 100 parts of water. The molybdate is sodium molybdate or ammonium molybdate.
The molybdate-single-doped rust inhibitor can react with iron ions to form Fe (MoO) in an alkaline solution4) And Fe2(MoO4)3And the like, thereby forming a more protective passive film on the surface of the steel bar, and forming a calcium molybdate precipitation film to further protect the steel bar. After the chloride is added, the molybdate can also compete with chloride ions for adsorption, so that the corrosion of the steel bar is further inhibited.
The preparation method of the environment-friendly composite steel bar rust inhibitor for the marine environment comprises the steps of weighing molybdate and benzotriazole according to parts by weight, adding the molybdate and the benzotriazole into an alkaline solution at room temperature, and stirring to prepare the environment-friendly composite steel bar rust inhibitor. The pH of the alkaline solution was 13.5. The room temperature was 25 ℃.
Example 1
Blank control group, soaked only in marine environment.
Example 2
The rust inhibitor of the embodiment comprises the following components in parts by weight: 0.25 part of sodium molybdate and 100 parts of water. The rust inhibitor is obtained by the following method: weighing the components in parts by weight, adding the components into an alkaline solution with the pH value of 13.5 at room temperature (25 ℃) and uniformly stirring the components by using a glass rod to obtain the water-based paint.
Example 3
The rust inhibitor of the embodiment comprises the following components in parts by weight: 0.25 part of sodium molybdate, 0.12 part of benzotriazole and 100 parts of water. The rust inhibitor is obtained by the following method: weighing the components in parts by weight, adding the components into an alkaline solution with the pH value of 13.5 at room temperature (25 ℃) and uniformly stirring the components by using a glass rod to obtain the water-based paint.
Example 4
The rust inhibitor of the embodiment comprises the following components in parts by weight: 0.25 part of sodium molybdate, 0.4 part of benzotriazole and 100 parts of water. The rust inhibitor is obtained by the following method: weighing the components in parts by weight, adding the components into an alkaline solution with the pH value of 13.5 at room temperature (25 ℃) and uniformly stirring the components by using a glass rod to obtain the water-based paint. According to FIG. 3, when the weight ratio of molybdate to benzotriazole is 1: the best inhibitory effect can be obtained when 3.
Example 5
The rust inhibitor of the embodiment comprises the following components in parts by weight: 0.25 part of sodium molybdate, 0.6 part of benzotriazole and 100 parts of water. The rust inhibitor is obtained by the following method: weighing the components in parts by weight, adding the components into an alkaline solution with the pH value of 13.5 at room temperature (25 ℃) and uniformly stirring the components by using a glass rod to obtain the water-based paint.
Example 6
The rust inhibitor of the embodiment comprises the following components in parts by weight: 0.15 part of sodium molybdate, 0.22 part of benzotriazole and 100 parts of water. The rust inhibitor is obtained by the following method: weighing the components in parts by weight, adding the components into an alkaline solution with the pH value of 13.5 at room temperature (25 ℃) and uniformly stirring the components by using a glass rod to obtain the water-based paint.
Example 7
The rust inhibitor of the embodiment comprises the following components in parts by weight: 0.35 part of sodium molybdate, 0.54 part of benzotriazole and 100 parts of water. The rust inhibitor is obtained by the following method: weighing the components in parts by weight, adding the components into an alkaline solution with the pH value of 13.5 at room temperature (25 ℃) and uniformly stirring the components by using a glass rod to obtain the water-based paint.
The test method is as follows:
(1) in the electrochemical impedance spectrum, the test is carried out on a Princeton 2273 electrochemical workstation, the frequency range is 100 kHz-10 mHz, and the applied alternating voltage is 10 mV.
(2) In the linear polarization method, the steel bar was subjected to polarization test with respect to the corrosion potential. + -.10 mV at a scan rate of 0.1667 mV/s.
(3) In potentiodynamic cyclic polarization, the test is carried out at a constant rate of 1mV/s, scanning from-0.1V relative to the corrosion potential, and kickback to the corrosion potential is initiated when 0.8V relative to the reference electrode is reached.
(4) The optical microscopic image is obtained by photographing a steel bar sample after soaking chlorine salt for 1 hour by an Oss micro microscope.
The test results were as follows:
(1) electrochemical impedance spectroscopy: as can be seen from FIG. 1, the volume arc resistance of the steel bar is obviously increased after the molybdate is added into the 3.5% chloride solution, which indicates that the corrosion resistance of the steel bar is improved. After the composite corrosion inhibitor (examples 3 and 4) is added, the capacitive arc resistance is further increased, which shows that the composite corrosion inhibitor can better improve the corrosion resistance of the steel bar compared with a single corrosion inhibitor, but if the content of benzotriazole is too high, as in example 5, the corrosion resistance of the steel bar is reduced, possibly caused by competitive adsorption of molybdate and benzotriazole.
(2) Potentiodynamic cyclic polarization curve: as shown in FIG. 2, the corrosion potential of the steel bar can be increased by adding a single corrosion inhibitor into a 3.5% chloride solution (E)corr) And pitting potential (E)pit) And the molybdate can improve the corrosion resistance of the steel bar. After the compound rust inhibitor is added, compared with a single rust inhibitor, the corrosion potential is slightly increased, and the pitting potential is obviously improved, which shows that the corrosion inhibitor can better inhibit corrosion. However, the benzotriazole content in the compounded rust inhibitor does not need to be too high, otherwise the pitting corrosion resistance can be reduced.
(3) Corrosion inhibition efficiency: polarization resistance R obtained by linear polarization methodpThe corresponding inhibition efficiency (%) is obtained by the formula (R)p,1-Rp,0)/Rp,1X 100, wherein Rp,0Is the polarization resistance, R, of the blank control group of reinforcing steel barsp,1The polarization resistance value of the steel bar after the complex rust inhibitor is added. And from fig. 3, it can be found that the corrosion inhibition efficiency of example 4 is the best.
(4) Optical microscopy: as can be seen from fig. 4, the blank control (example 1) showed significant corrosion, as shown in fig. 5, while the steel bar surface in example 2 with sodium molybdate added was slightly corroded, as shown in fig. 6, the steel bar surface in example 4 with the built rust inhibitor added was not corroded, which shows that the present invention can well inhibit the corrosion of the steel bar.
(5) Examples 6 and 7 can also illustrate the advantageous effects of the present invention.
The above embodiments are merely illustrative of the features and contents of the present invention, and the scope of the present invention is not limited thereto, and the contents of the claims of the present invention are subject to the claims. Any modification or variation made in accordance with the spirit of the present invention falls within the scope of the present invention.
Claims (7)
1. The environment-friendly composite steel bar rust inhibitor for the marine environment is characterized by comprising the following components in parts by mass: 0.15-0.35 part of molybdate, 0.1-0.65 part of benzotriazole and 100 parts of water.
2. The environment-friendly composite steel bar rust inhibitor for marine environment as claimed in claim 1, wherein the molybdate is sodium molybdate or ammonium molybdate.
3. The environment-friendly composite steel bar rust inhibitor for marine environment as claimed in claim 1, wherein the mass ratio of molybdate to benzotriazole is 1: 1-1: 5.
4. the environment-friendly composite steel bar rust inhibitor for marine environment as claimed in claim 3, wherein the mass ratio of molybdate to benzotriazole is 1: 3.
5. The preparation method of the environment-friendly composite steel bar rust inhibitor for the marine environment as claimed in any one of claims 1 to 4, characterized in that molybdate and benzotriazole are weighed according to the mass parts, added into an alkaline solution at room temperature and stirred to complete the preparation.
6. The method for preparing the environment-friendly composite steel bar rust inhibitor for the marine environment as claimed in claim 5, wherein the pH of the alkaline solution is 13.5.
7. The method for preparing the environment-friendly composite steel bar rust inhibitor for the marine environment as claimed in claim 5, wherein the room temperature is 25 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114737189A (en) * | 2022-03-18 | 2022-07-12 | 东南大学 | Method for producing a surface pretreatment layer |
Citations (3)
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| US5597514A (en) * | 1995-01-24 | 1997-01-28 | Cortec Corporation | Corrosion inhibitor for reducing corrosion in metallic concrete reinforcements |
| CN102851668A (en) * | 2012-09-21 | 2013-01-02 | 烟台蓝德空调工业有限责任公司 | Molybdate composite inhibitor with open circulating calcium chloride solution |
| CN105177591A (en) * | 2015-06-25 | 2015-12-23 | 广东电网有限责任公司电力科学研究院 | Natural seawater molybdate carbon steel composite corrosion inhibitor |
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2021
- 2021-03-09 CN CN202110254215.6A patent/CN112830701A/en active Pending
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|---|---|---|---|---|
| US5597514A (en) * | 1995-01-24 | 1997-01-28 | Cortec Corporation | Corrosion inhibitor for reducing corrosion in metallic concrete reinforcements |
| CN102851668A (en) * | 2012-09-21 | 2013-01-02 | 烟台蓝德空调工业有限责任公司 | Molybdate composite inhibitor with open circulating calcium chloride solution |
| CN105177591A (en) * | 2015-06-25 | 2015-12-23 | 广东电网有限责任公司电力科学研究院 | Natural seawater molybdate carbon steel composite corrosion inhibitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114737189A (en) * | 2022-03-18 | 2022-07-12 | 东南大学 | Method for producing a surface pretreatment layer |
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Application publication date: 20210525 |