A new green reinforcing steel rust inhibitor and its preparation method and application
By preparing a green steel reinforcement corrosion inhibitor based on microalgae powder, and utilizing its components to form a passivation film and physical barrier, the corrosion problem of reinforced concrete structures in chloride salt environments was solved, improving the durability and corrosion resistance of the structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HOHAI UNIV
- Filing Date
- 2026-03-11
- Publication Date
- 2026-05-29
AI Technical Summary
Existing reinforced concrete structures are prone to corrosion in chloride salt environments, leading to a decline in durability. Current rust inhibitors suffer from problems such as toxicity, high cost, or complex synthesis.
Using microalgae powder as the main raw material, supplemented with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder and Ce(NO3)3, a green steel rebar rust inhibitor is prepared through grinding, centrifugation and enzymatic hydrolysis to form a passivation film and physical barrier to prevent chloride ion intrusion.
It effectively inhibits steel corrosion, optimizes concrete porosity, and improves the durability of reinforced concrete structures. It is suitable for environments with high temperature, high humidity, and high chloride ion concentration.
Smart Images
Figure CN122102559A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a rust inhibitor, its preparation method and application, and more particularly to a novel green steel reinforcement rust inhibitor, its preparation method and application, belonging to the field of concrete technology. Background Technology
[0002] With the continuous advancement of reinforced concrete technology, it plays an important role in building structures such as houses, tunnels, and bridges. However, in the service environment of chloride salts, the corrosion of steel bars is the most important factor restricting the durability of reinforced concrete structures. Moreover, severe steel bar corrosion can lead to the decline of structural performance and a significant reduction in service life in a short period of time.
[0003] Applying corrosion inhibitors to steel bars is one of the measures to improve the durability of reinforced concrete structures in practical engineering. It is inexpensive and easy to operate. However, among the corrosion inhibitors currently used on the market, inorganic corrosion inhibitors are toxic; organic corrosion inhibitors require high concentrations to be effective, making them expensive; and mixed corrosion inhibitors have complex synthesis processes, hindering large-scale application. Microalgae, on the other hand, are single-celled organisms composed of prokaryotes, are environmentally friendly, and widely available. Therefore, there is an urgent need for a green steel bar corrosion inhibitor that utilizes microalgae as the main raw material. Summary of the Invention
[0004] Objectives of the invention: The first objective of this invention is to provide a novel green and effective rust-inhibiting agent for reinforcing steel bars; the second objective of this invention is to provide a method for preparing the rust-inhibiting agent for reinforcing steel bars; and the third objective of this invention is to provide an application of the rust-inhibiting agent for reinforcing steel bars.
[0005] To achieve the aforementioned primary objective, the technical solution for the steel reinforcement corrosion inhibitor provided by this invention is as follows:
[0006] The steel reinforcement rust inhibitor of the present invention is composed of microalgae powder and auxiliary materials. The amount of auxiliary materials added is 20-25 wt.% of the mass of microalgae powder. The auxiliary materials include 30-40 parts of bovine serum albumin, 20-30 parts of carboxymethyl chitosan, 20-30 parts of hydrotalcite powder, and 10-15 parts of Ce(NO3)3.
[0007] Preferably, the steel reinforcement rust inhibitor of the present invention further includes nano-SiO2, the amount of which is 10-15 wt.% of the total mass of microalgae powder and auxiliary materials.
[0008] Preferably, the steel reinforcement rust inhibitor of the present invention further includes alkaline protease.
[0009] To achieve the second objective mentioned above, the technical solution for preparing the steel reinforcement corrosion inhibitor provided by this invention is as follows:
[0010] The method for preparing the steel reinforcement rust inhibitor of the present invention includes the following steps: mixing microalgae powder with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder to obtain a mixture; grinding the above mixture into a mud to obtain a mud-like substance; adding anhydrous ethanol to the mud-like substance, centrifuging to obtain the supernatant; removing the ethanol from the supernatant to obtain a concentrated solution; adding alkaline protease to the concentrated solution to obtain an enzymatically hydrolyzed microalgae mixture, which is the steel reinforcement rust inhibitor.
[0011] Furthermore, the preparation method of microalgae powder involves washing, crushing and enriching microalgae, then freeze-drying under vacuum and grinding to obtain algae powder.
[0012] Preferably, the environmental conditions for cleaning and enrichment are 0~4℃.
[0013] Preferably, in freeze vacuum drying, the set temperature of the freeze vacuum dryer is -60℃ and the set time is 12~24h.
[0014] Furthermore, the method for grinding the above mixture into a paste is to add nano-SiO2 and anhydrous ethanol to the mixture, grind the mixture, and obtain the ground paste.
[0015] Preferably, when grinding into a paste, the amount of nano-SiO2 added is 10-15 wt.% of the mixed powder, and anhydrous ethanol is added until it just covers the mixture.
[0016] Preferably, in the centrifugation process, the centrifuge speed is set to 1000~3000 rpm and the centrifugation time is 10~15 min.
[0017] Furthermore, the method for removing ethanol from the supernatant is to remove the ethanol by rotary evaporation of the supernatant.
[0018] Preferably, in rotary evaporation, the evaporation temperature is 40~50℃, the rotation speed is set to 80~100rpm, and the volume is concentrated to 1 / 4 of the original volume.
[0019] Furthermore, alkaline protease is added to the concentrate to obtain an enzymatically hydrolyzed microalgae mixture. Water is then added to the microalgae mixture, and the resulting solution after stirring is the steel reinforcement rust inhibitor.
[0020] Preferably, the amount of alkaline protease added is 1-2 wt.% of the concentrate.
[0021] Further, alkaline protease is added to the concentrate to obtain a mixed solution. The mixed solution is continuously stirred in a magnetic stirrer to obtain an enzymatically hydrolyzed microalgae mixture. Deionized water is added to the enzymatically hydrolyzed microalgae mixture, and then it is continuously stirred in a magnetic stirrer. The resulting solution is a novel green steel reinforcement rust inhibitor.
[0022] Preferably, the mixed solution is continuously stirred in a magnetic stirrer with the stirring speed set to 400~600 rpm and the stirring time set to 6 hours.
[0023] Preferably, deionized water is added to the enzymatically hydrolyzed microalgae mixture, the magnetic stirrer speed is set to 1000 rpm, and the time is set to 2 hours.
[0024] To achieve the third objective mentioned above, the application technology solution of the steel reinforcement corrosion inhibitor provided by the present invention is as follows:
[0025] The steel reinforcement corrosion inhibitor of the present invention can be used in the preparation of reinforced concrete.
[0026] The application scenarios of the steel reinforcement corrosion inhibitor of the present invention are as follows: It is particularly suitable for harsh corrosive environments with high temperature, high humidity and high chloride ion concentration, including but not limited to marine engineering, port terminals, cross-sea bridges, and reinforced concrete structures of industrial and civil buildings in humid areas in the south and coastal areas. It is especially suitable for reinforced concrete components in the above-mentioned projects that are in the splash zone, water level fluctuation zone and salt spray erosion zone, and can effectively inhibit steel reinforcement corrosion caused by chloride ion penetration.
[0027] Preferably, the amount of steel corrosion inhibitor added accounts for 1% to 8% of the mass of cementitious materials in reinforced concrete.
[0028] Invention Principle: This invention proposes a novel green steel reinforcement rust inhibitor, the main component of which is microalgae containing electronegative atoms such as N and O, which can... 2+ and Fe 3+ In combination, these components adsorb onto the surface of the reinforcing steel, participating in the formation of a passivation film to inhibit steel corrosion. Furthermore, because the microalgae components are negatively charged, they can prevent the intrusion of corrosive media such as chloride ions through electrostatic repulsion, thus inhibiting steel corrosion. Bovine serum albumin and microalgae molecules form a denser composite adsorption film on the steel surface through hydrogen bonds and hydrophobic interactions, enhancing the physical barrier effect. The cations of carboxymethyl chitosan, through electrostatic attraction, enrich the negatively charged active components of the microalgae at the steel interface, improving film strength and adhesion. Hydrotalcite powder actively captures corrosive chloride ions in the concrete pore fluid through interlayer anion exchange, providing a stable interfacial environment for the organic film layer formed by microalgae and protein. Ce(NO3)3 powder can, when the passivation film on the steel surface is locally damaged by chloride ion erosion, generate an in-situ insoluble Ce(OH)3 or CeO2 deposition film to promptly repair defects and inhibit pitting corrosion propagation, ensuring the rust-inhibiting effect of the rust inhibitor.
[0029] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: (1) The present invention uses microalgae mixture as a steel reinforcement corrosion inhibitor, which contains electronegative atoms such as N and O, which can cooperate with iron ions to adsorb on the surface of steel reinforcement and participate in the formation of passivation film to hinder steel reinforcement corrosion. At the same time, it plays a synergistic role with other components in the corrosion inhibitor, thereby achieving the corrosion inhibition effect of reinforced concrete.
[0030] (2) The present invention uses microalgae mixture as a steel reinforcement corrosion inhibitor, which can optimize the porosity of concrete, thereby preventing the transport of chloride ions in concrete and thus inhibiting steel reinforcement corrosion caused by chloride ion penetration. Attached Figure Description
[0031] Figure 1 This is a cross-sectional schematic diagram of the steel electrode used in the embodiments and comparative examples. Detailed Implementation
[0032] The present invention will now be described in further detail.
[0033] Preparation process of the steel electrode used in the test: HPB335 steel bar with a diameter of 1 cm was selected and cut into 1 cm long test blocks. The sides and bottom surfaces of the steel bars were polished sequentially with 200 grit, 600 grit, 1200 grit, and 2000 grit sandpaper, until the bottom surface was polished to a mirror finish. One bottom surface was selected as the working surface, with an area of 0.785 cm². 2 The other bottom surface is connected to a copper wire, and all surfaces except the working surface are coated with epoxy resin. After the epoxy resin has solidified, the reinforcing bar is placed in anhydrous ethanol and subjected to ultrasonic treatment. It is then dried and set aside for later use. Figure 1 This is a cross-sectional schematic diagram of the steel electrode.
[0034] Potentiodynamic polarization method: This method changes the electrode potential at a constant rate, detects the current of the electrode at this time, and then obtains the corrosion potential and corrosion current. The test potential range is -0.25 V to 1.2 V relative to the open circuit potential, and the scan rate is 0.0002 V / s.
[0035] Example 1
[0036] A novel method for preparing a green steel rebar rust inhibitor includes the following steps:
[0037] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel reinforcement corrosion inhibitor mentioned in this invention. Add the steel reinforcement corrosion inhibitor at a dosage of 4% to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel reinforcement electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0038] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0039] Compared with Example 1, the difference between Examples 2-8 is that the amount of steel reinforcement corrosion inhibitor in concrete is changed.
[0040] Example 2
[0041] A novel method for preparing a green steel rebar rust inhibitor includes the following steps:
[0042] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel reinforcement corrosion inhibitor mentioned in this invention. Add 1% of this steel reinforcement corrosion inhibitor to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel reinforcement electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0043] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0044] Example 3
[0045] A novel method for preparing a green steel rebar rust inhibitor includes the following steps:
[0046] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel rebar rust inhibitor mentioned in this invention. Add 2% of this steel rebar rust inhibitor to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel rebar electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0047] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0048] Example 4
[0049] A novel method for preparing a green steel rebar rust inhibitor includes the following steps:
[0050] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel reinforcement corrosion inhibitor mentioned in this invention. Add the steel reinforcement corrosion inhibitor at a dosage of 3% to a saturated Ca(OH)2 solution to adjust the pH value to 11.5. Immerse the steel reinforcement electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0051] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0052] Example 5
[0053] A novel method for preparing a green steel rebar rust inhibitor includes the following steps:
[0054] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel rebar rust inhibitor mentioned in this invention. Add 5% of this steel rebar rust inhibitor to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel rebar electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0055] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0056] Example 6
[0057] A novel method for preparing a green steel rebar rust inhibitor includes the following steps:
[0058] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain the enzymatically hydrolyzed microalgae mixture. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel reinforcement corrosion inhibitor mentioned in this invention. Add 6% of this steel reinforcement corrosion inhibitor to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel reinforcement electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0059] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0060] Example 7
[0061] A novel method for preparing a green steel rebar rust inhibitor includes the following steps:
[0062] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel rebar rust inhibitor mentioned in this invention. Add the steel rebar rust inhibitor at a dosage of 7% to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel rebar electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0063] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0064] Example 8
[0065] A novel method for preparing a green steel rebar rust inhibitor includes the following steps:
[0066] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel rebar rust inhibitor mentioned in this invention. Add the steel rebar rust inhibitor at an 8% dosage to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel rebar electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0067] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0068] Compared with Example 1, the difference between Examples 9-15 is that the formulation of the steel reinforcement corrosion inhibitor is changed.
[0069] Example 9
[0070] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel reinforcement corrosion inhibitor mentioned in this invention. Add the steel reinforcement corrosion inhibitor at a dosage of 4% to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel reinforcement electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0071] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 30 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0072] Example 10
[0073] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel reinforcement corrosion inhibitor mentioned in this invention. Add the steel reinforcement corrosion inhibitor at a dosage of 4% to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel reinforcement electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0074] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 40 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0075] Example 11
[0076] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel reinforcement corrosion inhibitor mentioned in this invention. Add the steel reinforcement corrosion inhibitor at a dosage of 4% to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel reinforcement electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0077] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 20 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0078] Example 12
[0079] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel reinforcement corrosion inhibitor mentioned in this invention. Add the steel reinforcement corrosion inhibitor at a dosage of 4% to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel reinforcement electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0080] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 30 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0081] Example 13
[0082] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel reinforcement corrosion inhibitor mentioned in this invention. Add the steel reinforcement corrosion inhibitor at a dosage of 4% to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel reinforcement electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0083] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 20 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0084] Example 14
[0085] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 10 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes in a pre-cooled centrifuge, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel reinforcement corrosion inhibitor mentioned in this invention. Add the steel reinforcement corrosion inhibitor at a dosage of 4% to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel reinforcement electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0086] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 30 parts hydrotalcite powder, and 15 parts Ce(NO3)3. The total amount of the four components added is 25 wt.% of the microalgae powder.
[0087] Example 15
[0088] A novel method for preparing a green steel rebar rust inhibitor includes the following steps:
[0089] Microalgae were first washed, pulverized, and enriched at 4℃. They were then frozen at -20℃ for 12 hours and freeze-dried under vacuum at -60℃ for 24 hours. Afterward, the algae powder was obtained by grinding and sieving. The algae powder was mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder. Under low light, the mixture was transferred to a pre-cooled mortar, and 15 wt.% nano-SiO2 was added. Anhydrous ethanol (just enough to cover the mixture) pre-cooled to 4℃ was added, and the mixture was rapidly ground for 10 minutes to obtain a slurry. The slurry was transferred to pre-cooled centrifuge tubes, and anhydrous ethanol pre-cooled to 4℃ was added. The mixture was centrifuged at 3000 rpm for 10 minutes, and the supernatant was collected. The supernatant was placed in a rotary evaporator at 50℃ and 100 rpm to remove the ethanol, yielding a concentrate with 1 / 4 of the original volume. Add 1 wt.% alkaline protease to the concentrate and stir continuously at 600 rpm for 6 hours in a magnetic stirrer to obtain a microalgae mixture after enzymatic hydrolysis. Add an appropriate amount of deionized water to the mixture and stir continuously at 1000 rpm for 2 hours in a magnetic stirrer. The resulting solution is the novel green steel reinforcement corrosion inhibitor mentioned in this invention. Add the steel reinforcement corrosion inhibitor at a dosage of 4% to a saturated Ca(OH)2 solution to adjust the pH to 11.5. Immerse the steel reinforcement electrode in the solution for 7 days to achieve a pre-passivation effect. After pre-passivation, add solid NaCl to the solution every 24 hours to reduce the Cl concentration in the solution. - The concentration increased by 0.01 mol / L every 24 hours, and changes in electrochemical parameters were monitored until the steel bars were corroded.
[0090] The amounts of bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder added, by weight, are as follows: 35 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 10 parts Ce(NO3)3. The total amount of the four components added is 20 wt.% of the microalgae powder.
[0091] Comparative Example 1
[0092] Compared with Example 1, the difference in this comparative example is that microalgae are not added as a rust inhibitor for steel bars in this example; the remaining steps are the same as in Example 1.
[0093] Comparative Example 2
[0094] Compared with Example 1, the difference in this comparative example is that bovine serum albumin is not added as a steel reinforcement rust inhibitor; the remaining steps are the same as in Example 1.
[0095] Comparative Example 3
[0096] Compared with Example 1, the difference in this comparative example is that carboxymethyl chitosan is not added as a steel reinforcement corrosion inhibitor in this example; the remaining steps are the same as in Example 1.
[0097] Comparative Example 4
[0098] Compared with Example 1, the difference in this comparative example is that: no hydrotalcite powder is added as a steel reinforcement rust inhibitor in this example; the remaining steps are the same as in Example 1.
[0099] The polarization behavior of Examples 1-15 and Comparative Examples 1-4 in a 0.06 mol / L NaCl environment was analyzed using potentiodynamic polarization testing. The highest corrosion current density i in Examples 1-15 and Comparative Examples 1-4 was determined. corr The test results for the lowest corrosion potential E and the rust inhibition efficiency η are shown in Table 1. Corrosion current density i corr The larger the value, the smaller the corrosion potential E, indicating a faster corrosion rate of the steel reinforcement.
[0100] Table 1. Electrochemical parameters and rust inhibition efficiency of Examples 1-14 and Comparative Examples 1-4
[0101]
[0102] As shown in Table 1, compared to the highest corrosion current density of Comparative Example 1, the lowest corrosion current densities of Examples 1-8 with the addition of the novel green steel rebar rust inhibitor were significantly reduced. Specifically, the highest corrosion current densities of Examples 1-8 decreased by 92.3%, 60.6%, 80.4%, 88.9%, 86.0%, 82.8%, 76.5%, and 72.2%, respectively, compared to the highest corrosion current density of Comparative Example 1. Compared to the lowest corrosion potential of Comparative Example 1, the lowest corrosion potential of Examples 1-8 with the addition of the microalgae mixed extract was significantly increased. Specifically, the lowest corrosion potential of Examples 1-8 increased by 63.7%, 11.6%, 20.0%, 45.6%, 42.0%, 27.0%, 16.5%, and 12.2%, respectively, compared to the lowest corrosion potential of Comparative Example 1. This indicates that the rust inhibitor of the present invention reduces the corrosion rate of the solution to a certain extent and improves the corrosion resistance of the solution. Example 1 represents the optimal formulation, and 4% is the optimal dosage.
[0103] As shown in Table 1, compared with the highest corrosion current density of Example 1, the lowest corrosion current densities of Examples 9-15 and Comparative Examples 2-4 were significantly increased. Compared with the highest corrosion current density of Example 1, the highest corrosion current densities of Examples 9-15 and Control Groups 2-4 increased by 41.0%, 51.5%, 88.1%, 115.0%, 100.7%, 118.0%, 378.4%, 128.4%, 158.6%, and 142.2%, respectively. Compared with the lowest corrosion potential of Comparative Example 1, the lowest corrosion potentials of the steel reinforcement corrosion inhibitors with added microalgae mixed extracts in Examples 9-15 and Control Groups 2-4 were significantly decreased. Compared with the lowest corrosion potential of Example 1, the lowest corrosion potentials of Examples 9-15 and Control Groups 2-4 decreased by 48.2%, 55.5%, 66.5%, 90.6%, 69.1%, 92.1%, 145.5%, 110.0%, 126.2%, and 118.9%, respectively. This shows that the proportions of other components added to the rust inhibitor, besides microalgae, also affect the maximum corrosion current density and minimum corrosion potential of the rust inhibitor. It can be concluded that, by mass fraction, 35 parts bovine serum albumin, 25 parts carboxymethyl chitosan, 25 parts hydrotalcite powder, and 15 parts Ce(NO3)3 is the optimal proportion of other components.
Claims
1. A steel reinforcement corrosion inhibitor, characterized in that, It consists of microalgae powder and excipients. The amount of excipients added is 20-25 wt.% of the mass of microalgae powder. The excipients include 30-40 parts bovine serum albumin, 20-30 parts carboxymethyl chitosan, 20-30 parts hydrotalcite powder, and 10-15 parts Ce(NO3)3.
2. The steel reinforcement corrosion inhibitor according to claim 1, characterized in that, It also includes nano-SiO2, which is added at a rate of 10-15 wt.% of the total mass of microalgae powder and auxiliary materials.
3. The steel reinforcement corrosion inhibitor according to claim 1, characterized in that, It also includes alkaline proteases.
4. A method for preparing a steel reinforcement corrosion inhibitor according to any one of claims 1-3, characterized in that, Includes the following steps: Microalgae powder is mixed with bovine serum albumin, carboxymethyl chitosan, hydrotalcite powder, and Ce(NO3)3 powder to obtain a mixture. The mixture is then ground into a mud to obtain a mud-like substance. Anhydrous ethanol is added to the mud-like substance, and the supernatant is collected by centrifugation. The ethanol in the supernatant is removed to obtain a concentrated solution. Alkaline protease is added to the concentrated solution to obtain an enzymatically hydrolyzed microalgae mixture, which is the steel reinforcement rust inhibitor.
5. The method for preparing the steel reinforcement corrosion inhibitor according to claim 4, characterized in that, The preparation method of microalgae powder is as follows: after microalgae are washed, crushed and enriched, they are freeze-dried under vacuum and ground to obtain algae powder.
6. The method for preparing the steel reinforcement corrosion inhibitor according to claim 4, characterized in that, The method for grinding the above mixture into a paste is to add nano-SiO2 and anhydrous ethanol to the mixture, grind the mixture, and obtain the ground paste.
7. The method for preparing the steel reinforcement corrosion inhibitor according to claim 4, characterized in that, The method for removing ethanol from the supernatant is to remove the ethanol by rotary evaporation of the supernatant.
8. The method for preparing the steel reinforcement corrosion inhibitor according to claim 4, characterized in that, Alkaline protease is added to the concentrate to obtain an enzymatically hydrolyzed microalgae mixture. Water is then added to the microalgae mixture, and the resulting solution after stirring is the steel reinforcement rust inhibitor.
9. The application of the steel reinforcement corrosion inhibitor according to any one of claims 1-3 in the preparation of reinforced concrete.
10. The application according to claim 9, characterized in that, The amount of rust inhibitor added to steel bars accounts for 1% to 8% of the mass of cementitious materials in reinforced concrete.