CN111705319A - Environment-friendly corrosion inhibitor for circulating water closed system and preparation method thereof - Google Patents
Environment-friendly corrosion inhibitor for circulating water closed system and preparation method thereof Download PDFInfo
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- CN111705319A CN111705319A CN202010566772.7A CN202010566772A CN111705319A CN 111705319 A CN111705319 A CN 111705319A CN 202010566772 A CN202010566772 A CN 202010566772A CN 111705319 A CN111705319 A CN 111705319A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
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- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
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Abstract
The invention provides an environment-friendly corrosion inhibitor for a circulating water closed system and a preparation method thereof. The environment-friendly corrosion inhibitor for the circulating water closed system comprises the following raw materials in parts by weight: 5-10 parts of molybdate, 3-8 parts of organic amine, 5-8 parts of imidazoline, 0.5-1 part of benzotriazole, 1-2 parts of polyepoxysuccinic acid and 74-84 parts of ACS calcium sulfate aqueous solution. The environment-friendly corrosion inhibitor for the circulating water closed system, provided by the invention, is a molybdate formula corrosion inhibitor, replaces the existing chromate corrosion inhibitor, nitrite corrosion inhibitor, phosphorus corrosion inhibitor and silicon corrosion inhibitor, and well solves the problems of poor corrosion inhibition and sterilization capability and no environmental protection in the existing corrosion inhibitor.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to an environment-friendly corrosion inhibitor for a circulating water closed system and a preparation method thereof.
Background
In the working process of a circulating water closed system in the industries of chemical engineering and the like, softened water or chilled water needs to be supplemented into equipment for circulating cooling, and because the equipment is made of metal materials and can cause serious corrosion after being soaked in water for a long time, the control of the system mainly focuses on corrosion prevention of the equipment, and adding a corrosion inhibitor is the most economical, most convenient and most effective corrosion prevention method.
At present, corrosion inhibitors used for a circulating water closed system comprise three types of inorganic corrosion inhibitors, organic corrosion inhibitors and composite corrosion inhibitors, wherein the inorganic corrosion inhibitors and the organic corrosion inhibitors are single corrosion inhibitors and have limited corrosion prevention effect, and the composite corrosion inhibitors have synergistic effect among the components, so that the corrosion inhibition effect is better than that of the single corrosion inhibitor. The compound corrosion inhibitor has more formula systems, such as a chromate formula, a nitrite formula, a phosphorus formula and a silicon formula, wherein dichromate in the chromate formula is extremely toxic and harmful to the environment, and is eliminated and not used; the silicon formula is easy to generate silicate scales and is not easy to remove, and the silicon formula is used with care under the use condition at any moment and is not applied too much; phosphorus in the phosphorus system formula can bring eutrophication environmental protection problems to water, the environmental protection requirement limits the discharge of phosphorus, and the application is increasingly limited; the most applied circulating water closed system is a nitrite formula, and the nitrite belongs to carcinogenic substances and pollutes the environment, so that the application of the nitrite is further limited; therefore, the development of a new generation of molybdenum corrosion inhibitor is attracting more and more attention.
Molybdate is a positive passivation type corrosion inhibitor, which mainly takes the corrosion inhibition effect by the principle of an adsorption film and a deposition film, and has the advantages of good corrosion inhibition effect, high thermal stability and no influence of pH value change and chloride ion change on the corrosion inhibition effect when used in a large amount or used together with other substances, but the problems of large dosage, high cost and non-ideal corrosion inhibition effect exist when singly added. In order to solve various defects caused by single addition, a compound formula can be adopted, and two or more medicaments with different corrosion inhibition effects and mechanisms are compounded for use, so that the corrosion inhibition rate of the corrosion inhibitor can be greatly improved, and the consumption of molybdate is reduced, so that the development of a novel molybdate compound corrosion inhibitor is urgent.
Disclosure of Invention
In view of the above, the invention provides an environment-friendly corrosion inhibitor for a circulating water closed system, and aims to solve the problems of poor corrosion inhibition and sterilization capability and no environmental protection in discharge of the existing corrosion inhibitor.
The invention provides an environment-friendly corrosion inhibitor for a circulating water closed system, which comprises the following raw materials: molybdate, organic amine, imidazoline, benzotriazole, polyepoxysuccinic acid and an ACS calcium sulfate aqueous solution.
Further, in the environment-friendly corrosion inhibitor for the circulating water closed system, the weight parts of the raw materials in the environment-friendly corrosion inhibitor for the circulating water closed system are as follows: 5-10 parts of molybdate, 3-8 parts of organic amine, 5-8 parts of imidazoline, 0.5-1 part of benzotriazole, 1-2 parts of polyepoxysuccinic acid and 74-84 parts of ACS calcium sulfate aqueous solution.
Further, in the environment-friendly corrosion inhibitor for the circulating water closed system, the weight parts of the raw materials in the environment-friendly corrosion inhibitor for the circulating water closed system are as follows: 10 parts of molybdate, 5 parts of organic amine, 8 parts of imidazoline, 1 part of benzotriazole, 2 parts of polyepoxysuccinic acid and 74 parts of ACS calcium sulfate aqueous solution.
Further, in the above circulating water closed system environment-friendly corrosion inhibitor, the molybdate is one or more of sodium molybdate, potassium molybdate and ammonium molybdate.
Further, in the environment-friendly corrosion inhibitor for the circulating water closed system, the organic amine is one or more of diethanolamine, triethanolamine and cyclohexylamine.
Further, in the environment-friendly corrosion inhibitor for the circulating water closed system, the mass fraction of the ACS calcium sulfate aqueous solution is 1%.
A preparation method of an environment-friendly corrosion inhibitor for a circulating water closed system comprises the following steps:
(1) adding a 1% ACS calcium sulfate aqueous solution into a glass fiber reinforced plastic reaction kettle at a preset temperature and a preset stirring rate, stirring, adding molybdate, stirring for a first preset time until the molybdate is completely dissolved, sequentially adding imidazoline and polyepoxysuccinic acid, and stirring for a second preset time;
(2) after the benzotriazole is dissolved by organic amine in a medicine tank, the solution is added into the reaction kettle and stirred for a third preset time until all components are uniformly mixed, and finally, the mixture is filtered by 80-mesh filter cloth and then packaged to obtain the corrosion inhibitor.
Further, in the preparation method of the environment-friendly corrosion inhibitor for the circulating water closed system, the first preset time is 30 minutes, the second preset time is 10 minutes, and the third preset time is 5 minutes.
Further, in the preparation method of the environment-friendly corrosion inhibitor for the circulating water closed system, the preset temperature is 15-35 ℃.
Further, in the preparation method of the environment-friendly corrosion inhibitor for the circulating water closed system, the preset stirring speed is 60 r/min.
Compared with the prior art, the environment-friendly corrosion inhibitor for the circulating water closed system has the beneficial effects that the environment-friendly corrosion inhibitor for the circulating water closed system is prepared by using molybdate, organic amine, imidazoline, benzotriazole, polyepoxysuccinic acid and 1% ACS calcium sulfate aqueous solution as raw materials, and the prepared environment-friendly corrosion inhibitor for the circulating water closed system has good corrosion inhibition and sterilization capabilities. Wherein, the molybdate reacts with metal ions in the anode area of the metal surface to generate a protective film to achieve the corrosion inhibition effect; the organic amine and the imidazoline can be adsorbed by the charge on the surface of the metal, and a monomolecular film is formed in the whole anode area and the cathode area to play a role in corrosion inhibition; the benzotriazole can rapidly form a layer of film with metal ions on the surfaces of copper, cast iron, aluminum, zinc and other metals to prevent electrochemical corrosion of dissolved oxygen; the polyepoxysuccinic acid can well inhibit and disperse calcium carbonate scale, suspended matters and the like in water; the ACS calcium sulfate aqueous solution has a corrosion inhibition effect and also has strong bactericidal ability.
In addition, the environment-friendly corrosion inhibitor for the circulating water closed system is a molybdenum corrosion inhibitor, compared with a chromate corrosion inhibitor, a nitrite corrosion inhibitor, a phosphorus corrosion inhibitor and a silicon corrosion inhibitor, the molybdenum corrosion inhibitor is an environment-friendly corrosion inhibitor, and the water quality discharge of the water treated by the molybdenum corrosion inhibitor is not limited by environment protection.
Furthermore, the preparation method of the environment-friendly corrosion inhibitor for the circulating water closed system provided by the invention has the advantages of simple production process, capability of reducing the production cost and popularization and application.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below. While exemplary embodiments of the present disclosure are shown in the detailed description, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
The invention provides an environment-friendly corrosion inhibitor for a circulating water closed system, which comprises the following raw materials in parts by weight: 5-10 parts of molybdate, 3-8 parts of organic amine, 5-8 parts of imidazoline, 0.5-1 part of benzotriazole, 1-2 parts of polyepoxysuccinic acid and 74-84 parts of ACS calcium sulfate aqueous solution.
Wherein the raw materials have the following functions:
(1) molybdate: the corrosion inhibition mechanism is that metal ions are acted in the anode area of the metal surface to generate oxide or hydroxide to cover the anode to form a protective film to inhibit the metal from dissolving into water. The molybdate can contact with the surface of the carbon steel to form stable Fe2O3、MoO3、FeMoO4The formed compact protective film plays a role in preventing the corrosion of harmful substances to the surface of the metal, thereby inhibiting the further expansion of the corrosion of the matrix.
(2) Organic amine: belongs to an adsorption film type corrosion inhibitor, has polar genes, can be adsorbed by metal surface charges, and forms a monolayer in the whole anode region and the whole cathode region, thereby preventing or slowing down corresponding electrochemical reactions. The corrosion inhibitor has high film forming speed, can generate a synergistic effect with other corrosion inhibitors, and different adsorbed corrosion inhibitor molecules or ions can attract each other to increase the surface coverage, so that the corrosion inhibitor has a good corrosion inhibition effect.
(3) Imidazoline: belongs to an adsorption film type corrosion inhibitor, has polar genes, can be adsorbed by metal surface charges, and forms a monolayer in the whole anode region and the whole cathode region, thereby preventing or slowing down corresponding electrochemical reactions.
(4) Benzotriazole: the corrosion inhibitor belongs to a copper corrosion inhibitor, which can quickly form a layer of film with cuprous ions on the surface of copper metal to prevent electrochemical corrosion of dissolved oxygen, and the corrosion inhibition performance of the corrosion inhibitor is also effective on metals such as cast iron, aluminum, zinc and the like.
(5) Polyepoxysuccinic acid: a non-nitrogen non-phosphorus environment-friendly scale inhibition and dispersion agent has good scale inhibition and dispersion effects on calcium carbonate scale, suspended matters and the like in water. Is a green water treatment chemical.
(6) 1% aqueous ACS calcium sulfate solution: a novel corrosion inhibition product is an acidic food fresh-keeping and anti-corrosion additive which is certified by the American FDA and the USDA and meets the safety standard of GRAS, and because the solution contains a large amount of simple substance oxygen and dissolved oxygen with certain concentration, the oxidation potential is high, and the corrosion inhibition effect and the strong sterilization capability are realized.
The corrosion inhibitor is prepared by using molybdate, organic amine, imidazoline, benzotriazole, polyepoxysuccinic acid and 1% ACS calcium sulfate aqueous solution as raw materials, and the prepared circulating water closed system has good environment-friendly corrosion inhibition and sterilization capability; in addition, compared with chromate corrosion inhibitor, nitrite corrosion inhibitor, phosphorus corrosion inhibitor and silicon corrosion inhibitor, the molybdenum corrosion inhibitor provided by the invention is an environment-friendly corrosion inhibitor, and the water discharge of water treated by the molybdenum corrosion inhibitor is not limited by environment protection.
Further, a preparation method of the environment-friendly corrosion inhibitor for the circulating water closed system comprises the following steps:
(1) adding 1% of ACS calcium sulfate aqueous solution into a glass fiber reinforced plastic reaction kettle and stirring under the conditions that the preset temperature is 15-35 ℃ and the preset stirring speed is 60r/min, then adding molybdate and stirring for 30 minutes until the molybdate is completely dissolved, and sequentially adding imidazoline and polyepoxysuccinic acid and stirring for 10 minutes;
(2) after the benzotriazole is dissolved by organic amine in a medicine tank, the solution is added into the reaction kettle and stirred for 5 minutes until all components are uniformly mixed, and finally, the mixture is filtered by 80-mesh filter cloth and then packaged to obtain the corrosion inhibitor.
The preparation method of the environment-friendly corrosion inhibitor for the circulating water closed system provided by the invention has the advantages of simple production process, capability of reducing production cost and popularization and application
Example 1
An environment-friendly corrosion inhibitor for a circulating water closed system comprises the following raw materials in parts by weight: 10 parts of molybdate, 5 parts of organic amine, 8 parts of imidazoline, 1 part of benzotriazole, 1 part of polyepoxysuccinic acid and 74 parts of ACS calcium sulfate aqueous solution.
The specific preparation process comprises the following steps:
(1) adding 1% of ACS calcium sulfate aqueous solution into a glass fiber reinforced plastic reaction kettle and stirring under the conditions that the preset temperature is 15-35 ℃ and the preset stirring speed is 60r/min, then adding molybdate and stirring for 30 minutes until the molybdate is completely dissolved, and sequentially adding imidazoline and polyepoxysuccinic acid and stirring for 10 minutes;
(2) after the benzotriazole is dissolved by organic amine in a medicine tank, the solution is added into the reaction kettle and stirred for 5 minutes until all components are uniformly mixed, and finally, the mixture is filtered by 80-mesh filter cloth and then packaged to obtain the corrosion inhibitor.
Example 2
An environment-friendly corrosion inhibitor for a circulating water closed system comprises the following raw materials in parts by weight: 8 parts of molybdate, 8 parts of organic amine, 5 parts of imidazoline, 0.5 part of benzotriazole, 2 parts of polyepoxysuccinic acid and 77.5 parts of ACS calcium sulfate aqueous solution.
The specific preparation process comprises the following steps:
(1) adding 1% of ACS calcium sulfate aqueous solution into a glass fiber reinforced plastic reaction kettle and stirring under the conditions that the preset temperature is 15-35 ℃ and the preset stirring speed is 60r/min, then adding molybdate and stirring for 30 minutes until the molybdate is completely dissolved, and sequentially adding imidazoline and polyepoxysuccinic acid and stirring for 10 minutes;
(2) after the benzotriazole is dissolved by organic amine in a medicine tank, the solution is added into the reaction kettle and stirred for 5 minutes until all components are uniformly mixed, and finally, the mixture is filtered by 80-mesh filter cloth and then packaged to obtain the corrosion inhibitor.
Example 3
An environment-friendly corrosion inhibitor for a circulating water closed system comprises the following raw materials in parts by weight: 5 parts of molybdate, 3 parts of organic amine, 5 parts of imidazoline, 1 part of benzotriazole, 2 parts of polyepoxysuccinic acid and 84 parts of ACS calcium sulfate aqueous solution.
The specific preparation process comprises the following steps:
(1) adding 1% of ACS calcium sulfate aqueous solution into a glass fiber reinforced plastic reaction kettle and stirring under the conditions that the preset temperature is 15-35 ℃ and the preset stirring speed is 60r/min, then adding molybdate and stirring for 30 minutes until the molybdate is completely dissolved, and sequentially adding imidazoline and polyepoxysuccinic acid and stirring for 10 minutes;
(2) after the benzotriazole is dissolved by organic amine in a medicine tank, the solution is added into the reaction kettle and stirred for 5 minutes until all components are uniformly mixed, and finally, the mixture is filtered by 80-mesh filter cloth and then packaged to obtain the corrosion inhibitor.
Comparative example 1
Comparative example 1 is a nitrous acid corrosion inhibitor manufactured by Deltan Water technology, Inc.
Comparative example 2
No corrosion inhibitor is added.
The performance of the circulating water closed system environment-friendly corrosion inhibitor obtained in the embodiment 1-3, the nitrous acid corrosion inhibitor of the comparative example 1-2 and no corrosion inhibitor is detected, and the detection method comprises the following steps:
and (4) evaluating the corrosion inhibition performance, and determining the corrosion inhibition performance of the water treatment agent according to the national standard GB/T87157-2014.
The detection method comprises the following steps: the rotary hanging method.
Test equipment: RCC-1 rotating coupon corrosion tester.
Test temperature: 50 +/-1 ℃.
Test time: for 72 hours.
Stirring speed: 75 r/min.
The hanging piece is made of: 20# carbon steel, area 28cm2。
Test water quality: and (4) desalting water.
Adding concentration: 1000 mg/L.
The experimental steps are as follows: opening the rotary hanging sheet corrosion tester, heating to 50 ℃, adding 1500mL of test water into a 2000mL beaker, respectively adding the corrosion inhibitor obtained in the embodiment and a commercially available corrosion inhibitor according to the requirement of adding concentration, uniformly stirring, pouring into the rotary hanging sheet tester, hanging a treated and weighed test specimen, starting stirring, supplementing 250mL of demineralized water into the beaker every 24 hours, maintaining the liquid level at 1500mL, and carrying out closed operation for 72 hours. And (4) after the test is finished, taking out the test piece, processing and weighing according to standard requirements, and calculating the corrosion rate.
After 1000mg/l of the corrosion inhibitor prepared in the example and the corrosion inhibitor provided by the comparative example are added into the experimental treated water, the corrosion degree of the test piece is measured and drawn into a table for comparison to evaluate the corrosion inhibition capability of the corrosion inhibitor, and the specific experimental result is shown in the following table 1.
TABLE 1
As can be seen from the above Table 1, the circulating water closed system environment-friendly corrosion inhibitor prepared by the embodiment of the invention has better corrosion inhibition performance than the commercially available corrosion inhibitor, and meets the design requirements. The environment-friendly corrosion inhibitor for the circulating water closed system prepared in the embodiment 1 has the best slow release effect, wherein the corrosion rate of carbon steel is 0.0032mm/a, the corrosion rate of copper is 0.0011mm/a, and the corrosion rate of stainless steel is 0.
Obviously, the environment-friendly corrosion inhibitor for the circulating water closed system provided by the invention is prepared by using molybdate, organic amine, imidazoline, benzotriazole, polyepoxysuccinic acid and 1% ACS calcium sulfate aqueous solution as raw materials, and the prepared environment-friendly corrosion inhibitor for the circulating water closed system has good corrosion inhibition and sterilization capabilities. In addition, the environment-friendly corrosion inhibitor for the circulating water closed system is a molybdenum corrosion inhibitor, compared with a chromate corrosion inhibitor, a nitrite corrosion inhibitor, a phosphorus corrosion inhibitor and a silicon corrosion inhibitor, the molybdenum corrosion inhibitor is an environment-friendly corrosion inhibitor, and the water quality discharge of the water treated by the molybdenum corrosion inhibitor is not limited by environment protection.
Furthermore, the preparation method of the environment-friendly corrosion inhibitor for the circulating water closed system provided by the invention has the advantages of simple production process, capability of reducing the production cost and popularization and application.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An environment-friendly corrosion inhibitor for a circulating water closed system is characterized by comprising the following raw materials: molybdate, organic amine, imidazoline, benzotriazole, polyepoxysuccinic acid and an ACS calcium sulfate aqueous solution.
2. The environment-friendly corrosion inhibitor for the circulating water closed system as claimed in claim 1, wherein the environment-friendly corrosion inhibitor for the circulating water closed system comprises the following raw materials in parts by weight: 5-10 parts of molybdate, 3-8 parts of organic amine, 5-8 parts of imidazoline, 0.5-1 part of benzotriazole, 1-2 parts of polyepoxysuccinic acid and 74-84 parts of ACS calcium sulfate aqueous solution.
3. The environment-friendly corrosion inhibitor for the circulating water closed system as claimed in claim 2, wherein the environment-friendly corrosion inhibitor for the circulating water closed system comprises the following raw materials in parts by weight: 10 parts of molybdate, 5 parts of organic amine, 8 parts of imidazoline, 1 part of benzotriazole, 2 parts of polyepoxysuccinic acid and 74 parts of ACS calcium sulfate aqueous solution.
4. The circulating water closed system environment-friendly corrosion inhibitor as claimed in any one of claims 1 to 3, wherein the molybdate is one or more of sodium molybdate, potassium molybdate and ammonium molybdate.
5. The environmentally friendly corrosion inhibitor for the circulating water closed system as claimed in any one of claims 1 to 3, wherein the organic amine is one or more of diethanolamine, triethanolamine and cyclohexylamine.
6. The environment-friendly corrosion inhibitor for the circulating water closed system as claimed in any one of claims 1 to 3, wherein the mass fraction of the ACS calcium sulfate aqueous solution is 1%.
7. A preparation method of an environment-friendly corrosion inhibitor for a circulating water closed system is characterized by comprising the following steps:
(1) adding a 1% ACS calcium sulfate aqueous solution into a glass fiber reinforced plastic reaction kettle at a preset temperature and a preset stirring rate, stirring, adding molybdate, stirring for a first preset time until the molybdate is completely dissolved, sequentially adding imidazoline and polyepoxysuccinic acid, and stirring for a second preset time;
(2) after the benzotriazole is dissolved by organic amine in a medicine tank, the solution is added into the reaction kettle and stirred for a third preset time until all components are uniformly mixed, and finally, the mixture is filtered by 80-mesh filter cloth and then packaged to obtain the corrosion inhibitor.
8. The method for preparing the environment-friendly corrosion inhibitor for the circulating water closed system according to claim 7, wherein the first preset time is 30 minutes, the second preset time is 10 minutes, and the third preset time is 5 minutes.
9. The method for preparing the environment-friendly corrosion inhibitor for the circulating water closed system according to claim 7, wherein the preset temperature is 15-35 ℃.
10. The method for preparing the environment-friendly corrosion inhibitor for the circulating water closed system according to claim 7, wherein the preset stirring speed is 60 r/min.
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| 许立国等: "《火电厂水处理技术》", 30 September 2006, 中国电力出版社 * |
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