CN115323384A - High-efficiency corrosion inhibitor for magnetic refrigeration material and application thereof - Google Patents
High-efficiency corrosion inhibitor for magnetic refrigeration material and application thereof Download PDFInfo
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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
- C23F11/18—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 using inorganic inhibitors
- C23F11/187—Mixtures of inorganic inhibitors
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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
- C23F11/18—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 using inorganic inhibitors
- C23F11/187—Mixtures of inorganic inhibitors
- C23F11/188—Mixtures of inorganic inhibitors containing phosphates
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Abstract
The invention provides a high-efficiency corrosion inhibitor for a magnetic refrigeration technology and application thereof, and relates to the technical field of magnetic refrigeration, wherein the high-efficiency corrosion inhibitor comprises at least 3 of the following components: na (Na) 2 MoO 4 ·2H 2 O、Na 2 HPO 4 ·12H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 SiO 3 ·9H 2 O、NaH 2 PO 4 、Na 2 CO 3 、NaNO 2 、K 2 CrO 7 、ZnSO 4 (ii) a And the pH value of the high-efficiency corrosion inhibitor is 6-8. Compared with the method for improving the intrinsic corrosion resistance of the magnetic refrigeration material by changing the chemical components and the tissue structure of the magnetic refrigeration material, the high-efficiency corrosion inhibitor prepared by the invention has the advantages of simple component proportion, easy preparation operation, better corrosion inhibition effect and wider universality, has important significance for practical application, and can greatly promote the application of the magnetic refrigeration technology.
Description
Technical Field
The invention relates to the technical field of magnetic refrigeration, in particular to a high-efficiency corrosion inhibitor for a magnetic refrigeration material and application thereof in the magnetic refrigeration technology.
Background
In modern society, refrigeration technology has been widely applied to various industries of human life. The energy consumption for refrigeration in daily life reaches 28 percent, and the greenhouse gas CO brought by the energy consumption reaches 2 The proportion of emissions is even as high as 30%. The efficiency of the traditional gas compression refrigeration technology is only about 40%, and simultaneously, a large amount of greenhouse gas is discharged, so that people need to find a novel refrigeration technology which is efficient, energy-saving and environment-friendly. Compared with the traditional gas compression refrigeration technology, the continuously developed novel solid-state phase-change refrigeration technology has the advantages of environmental protection, high efficiency and energy saving, and the theoretical Carnot efficiency value (60%) of the novel solid-state phase-change refrigeration technology is far higher than that of a semiconductor refrigeration technology (5-10%) commonly used in the microelectronic industry. At present, energy and environmental crisis are increasing day by day, the development of novel solid-state refrigeration materials and technology has important social benefit and economic benefit. A great deal of financial and material resources are invested in various countries in the world to research solid-state card effect materials and technologies.
The magnetic refrigeration technology is a green refrigeration technology which takes a magnetic material as a working medium and utilizes the magnetocaloric effect of the material to refrigerate. Compared with the traditional gas compression-expansion refrigeration technology, the magnetic refrigeration technology has the following advantages: 1) Green and environment-friendly: the magnetic refrigeration adopts a solid refrigeration working medium, so that the problems of toxic gas, easy leakage, flammability, ozone layer damage, greenhouse effect and the like are solved; 2) High-efficiency and energy-saving: the thermodynamic process of magnetic refrigeration for generating the magnetocaloric effect is efficient and reversible, and the intrinsic thermodynamic efficiency of the thermodynamic process can reach 60-70% of the Carnot efficiency; 3) The method is stable and reliable: the magnetic refrigeration does not need a gas compressor, and has the advantages of small vibration and noise, long service life and high reliability. Accordingly, magnetic refrigeration technology has recently received much attention worldwide.
In recent years, when a magnetic refrigeration material is used as a refrigeration working medium in a refrigerator, a water-based heat exchange fluid is mainly used as a heat exchange medium of a refrigeration cycle, so that the problem of serious corrosion of the magnetic refrigeration material is caused. Particularly, the continuous change of the cold and heat exchange fluid and the alternating magnetic field further aggravates the corrosion of the magnetic refrigeration material, and seriously hinders the development and the application of the magnetic refrigeration material and the technology. Therefore, the key problem to be solved at present is to effectively improve the corrosion problem of the magnetic refrigeration material in the application process.
In previous studies, researchers have improved the intrinsic corrosion resistance of magnetic refrigeration materials by altering their chemical composition and organization. For example, patent 201310014932.7 proposes to introduce Cr element into rare earth magnetic refrigeration material to improve its corrosion performance. In addition, patent 201910792374.4 proposes to prepare a complex phase magnetic refrigeration material to form a special impurity phase with high corrosion resistance, thereby improving the corrosion resistance. However, the above method is complicated, the improvement of corrosion resistance is not significant, and the method does not have universality applicable to different types of magnetic refrigeration materials. In contrast, introduction of corrosion inhibitors into water-based heat transfer fluids is generally easier to handle, has better corrosion inhibition effects, and is more versatile.
CN101514458B provides a water-soluble corrosion inhibitor for La-Fe-Si series room temperature magnetic refrigeration materials, which can remarkably improve the corrosion resistance of the La-Fe-Si series room temperature magnetic refrigeration materials in water-based heat exchange fluid, and specifically comprises 0.1-10 wt% of aluminate, 0-5 wt% of dichromate, 0-8 wt% of nitrite, 0.5-3 wt% of orthophosphate, 0.05-2 wt% of silicate, 0-1 wt% of borate, 0-3 wt% of sodium benzoate, 0-0.1 wt% of zinc sulfate, 0-0.5 wt% of sodium carbonate and 0-10 wt% of triethanolamine, wherein the base solution is distilled water. However, it does not take into consideration the ph value of the corrosion inhibitor itself, so that it is possible to use a strong alkaline corrosion inhibitor, which, although inhibiting the corrosion of the magnetic refrigeration material, will attack other components of the magnetic refrigeration system, thereby making it impractical to use.
In view of the above research background and the practical application requirement of magnetic refrigeration technology, in recent years, the search for high-efficiency corrosion inhibitors for magnetic refrigeration materials has become a new focus in the field of magnetic refrigeration technology research.
Disclosure of Invention
The invention aims to provide a high-efficiency corrosion inhibitor for a magnetic refrigeration technology, which has the advantages of simple component proportion, easy preparation and operation, better corrosion inhibition effect and wider universality and can greatly promote the application of the magnetic refrigeration technology. According to the invention, the pH value of the corrosion inhibitor is fully considered, and the corrosion inhibitor which adopts different chemical components and proportions and meets the specific pH value achieves the effects of good corrosion inhibition effect and neutral pH value, is friendly to equipment and avoids corrosion.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-efficiency corrosion inhibitor for magnetic refrigeration materials comprises at least 3 of the following components: na (Na) 2 MoO 4 ·2H 2 O、Na 2 HPO 4 ·12H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 SiO 3 ·9H 2 O、NaH 2 PO 4 、Na 2 CO 3 、NaNO 2 、K 2 CrO 7 、ZnSO 4 (ii) a The pH value of the high-efficiency corrosion inhibitor is 6-8; wherein, with respect to the base liquid water, na 2 MoO 4 ·2H 2 The concentration of O is 0 to 20g/L, na 2 HPO 4 ·12H 2 The concentration of O is 0 to 20g/L, na 2 B 4 O 7 ·10H 2 The concentration of O is 0 to 20g/L; na (Na) 2 SiO 3 ·9H 2 The concentration of O is 0 to 10g/L, naH 2 PO 4 Has a concentration of 0 to 10g/L, na 2 CO 3 The concentration of (A) is 0-10 g/L, naNO 2 Has a concentration of 0 to 10g/L, K 2 CrO 7 The concentration of (B) is 0-10 g/L, znSO 4 The concentration of (A) is 0 to 10g/L.
According to the scheme, the components are proportioned according to the concentration, added into water for physical mixing, and stirred uniformly.
In the present invention, the concentrations of the above components refer to the grams of the respective components present in each liter of water. That is, the concentration of each component is measured relative to the base liquid water of the high efficiency corrosion inhibitor.
In some preferred embodiments of the present invention, the high-efficiency corrosion inhibitor is composed of the following components: na (Na) 2 MoO 4 ·2H 2 O、Na 2 HPO 4 ·12H 2 O and NaH 2 PO 4 Relative to the base liquid water, na 2 MoO 4 ·2H 2 The concentration of O is 1-5 g/L, na 2 HPO 4 ·12H 2 The concentration of O is 0.5 to 4g/L, naH 2 PO 4 The concentration of (B) is 0.1-1.5 g/L. The invention can adopt only 3 compositions and keep a certain pH value, thus obtaining excellent slow release effect.
In some preferred embodiments of the present invention, the high-efficiency corrosion inhibitor is composed of the following components: na (Na) 2 MoO 4 ·2H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 SiO 3 ·9H 2 O and NaH 2 PO 4 Relative to the base liquid water, na 2 MoO 4 ·2H 2 The concentration of O is 1-5 g/L, na 2 B 4 O 7 ·10H 2 The concentration of O is 1-3 g/L, na 2 SiO 3 ·9H 2 The concentration of O is 1 to 3g/L, naH 2 PO 4 The concentration of (b) is 1 to 3g/L.
In some preferred embodiments of the present invention, the high-efficiency corrosion inhibitor is composed of the following components: na (Na) 2 MoO 4 ·2H 2 O、Na 2 HPO 4 ·12H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 CO 3 And NaNO 2 (ii) a Relative to the base liquid water, na 2 MoO 4 ·2H 2 The concentration of O is 3-7 g/L, na 2 HPO 4 ·12H 2 The concentration of O is 0.5-3 g/L, na 2 B 4 O 7 ·10H 2 The concentration of O is 1-6 g/L, na 2 CO 3 The concentration of (b) is 7-15 g/L, naNO 2 The concentration of (b) is 0.5-4 g/L.
In some preferred embodiments of the present invention, the high-efficiency corrosion inhibitor is composed of the following components: na (Na) 2 HPO 4 ·12H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 SiO 3 ·9H 2 O、NaH 2 PO 4 、K 2 CrO 7 、ZnSO 4 (ii) a Relative to the base liquid water, na 2 HPO 4 ·12H 2 The concentration of O is 1-3 g/L, na 2 B 4 O 7 ·10H 2 The concentration of O is 4-6 g/L, na 2 SiO 3 ·9H 2 The concentration of O is 7 to 9g/L, naH 2 PO 4 Has a concentration of 5-7 g/L, K 2 CrO 7 The concentration of (A) is 11-13 g/L, znSO 4 The concentration of (B) is 0.1-1 g/L.
The magnetic refrigeration material can be La (Fe, si) 13 MnFe (P, X) (X = Si or Ge), gd or Gd 5 (Si,Ge) 4 A basic magnetic refrigeration material. Because different materials have different corrosion mechanisms and the requirements of the required corrosion inhibitor are different, the high-efficiency corrosion inhibitor is particularly suitable for the magnetic refrigeration materials and can obtain excellent slow-release effect.
According to the scheme, the corrosion current density value of the magnetic refrigeration material after being soaked for 500 hours by the high-efficiency corrosion inhibitor is 0-5 mu A/cm 2 Rate of corrosion<0.005g/m 2 h。
The invention also provides application of the high-efficiency corrosion inhibitor in corrosion prevention of magnetic refrigeration materials.
Compared with the prior art, the invention has the beneficial effects that:
compared with the corrosion inhibitor in the prior art, the corrosion inhibitor disclosed by the invention has the advantages that the special components and contents are adopted, the specific pH is met, an effective passivation film can be formed on the surface of the material, the high-efficiency corrosion inhibition effect is achieved, the pH value neutrality of the corrosion inhibitor can be considered, and the synergistic corrosion-resistant effect of each component is achieved.
Compared with the method that the intrinsic corrosion resistance of the magnetic refrigeration material is improved by changing the chemical components and the tissue structure of the magnetic refrigeration material, the high-efficiency corrosion inhibitor prepared by the method has the advantages of simple component proportion and easy preparation operation; has better corrosion inhibition effect and wider universality, and has important significance for practical application.
Drawings
FIG. 1 shows a typical La (Fe, si)) 13 A comparison graph of surface appearance of the basic magnetic refrigeration material before and after the basic magnetic refrigeration material is soaked in the corrosion inhibitor obtained in the embodiment 1, the comparative example 1 and the comparative example 2 of the invention for 1 day respectively;
FIG. 2 shows a typical La (Fe, si) 13 Electric polarization curves of the basic magnetic refrigeration material in the embodiment 1 and the comparative example 1 of the invention respectively;
FIG. 3 shows a typical La (Fe, si) 13 The basic magnetic refrigeration material has the corrosion rate of being soaked for 504 hours in the example 1 and the comparative example 1 respectively.
Detailed Description
The technical solution of the present invention is described below with reference to the accompanying drawings and examples.
Example 1:
the invention provides a high-efficiency corrosion inhibitor, which comprises the following components: na (Na) 2 MoO 4 ·2H 2 O、Na 2 HPO 4 ·12H 2 O、NaH 2 PO 4 。
Na in the component 2 MoO 4 ·2H 2 The concentration of O is 3.1g/L, na 2 HPO 4 ·12H 2 The concentration of O is 1.55g/L, naH 2 PO 4 The concentration of (2) was 0.2g/L.
The components are proportioned according to the concentration, added into water for physical mixing, and stirred uniformly.
Example 2:
the invention provides a high-efficiency corrosion inhibitor, which comprises the following components: na (Na) 2 MoO 4 ·2H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 SiO 3 ·9H 2 O、NaH 2 PO 4 。
In the component Na 2 MoO 4 ·2H 2 The concentration of O is 4.5g/L, na 2 B 4 O 7 ·10H 2 The concentration of O is 2.5g/L, na 2 SiO 3 ·9H 2 The concentration of O is 2.5g/L, naH 2 PO 4 The concentration of (2) was 2.5g/L.
The components are proportioned according to the concentration, added into water for physical mixing, and stirred uniformly.
Example 3:
the invention provides a high-efficiency corrosion inhibitor, which comprises the following components: na (Na) 2 MoO 4 ·2H 2 O、Na 2 HPO 4 ·12H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 CO 3 、NaNO 2 。
In the component Na 2 MoO 4 ·2H 2 The concentration of O is 5.0g/L, na 2 HPO 4 ·12H 2 The concentration of O is 1.0g/L, na 2 B 4 O 7 ·10H 2 The concentration of O is 3.2g/L, na 2 CO 3 Has a concentration of 10.0g/L, naNO 2 The concentration of (2) was 0.5g/L.
The components are proportioned according to the concentration, added into water for physical mixing, and stirred uniformly.
Example 4:
the invention provides a high-efficiency corrosion inhibitor, which comprises the following components: na (Na) 2 HPO 4 ·12H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 SiO 3 ·9H 2 O、NaH 2 PO 4 、K 2 CrO 7 、ZnSO 4 。
Na in the component 2 HPO 4 ·12H 2 The concentration of O is 2.1g/L, na 2 B 4 O 7 ·10H 2 The concentration of O is 5.2g/L, na 2 SiO 3 ·9H 2 The concentration of O is 8.2g/L, naH 2 PO 4 Has a concentration of 6.6g/L, K 2 CrO 7 Is 12.5g/L, znSO 4 The concentration of (2) was 0.3g/L.
The components are proportioned according to the concentration, added into water for physical mixing, and stirred uniformly.
Comparative example 1:
unlike the above examples, the composition of this comparative example was deionized water, and contained no 9 ingredients (Na) 2 MoO 4 ·2H 2 O、Na 2 HPO 4 ·12H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 SiO 3 ·9H 2 O, etc.).
Comparative example 2:
unlike the above examples, this comparative example uses a corrosion inhibitor provided in CN101514458B, which contains the following components in the following concentrations: 10wt% of aluminate, 0.1wt% of dichromate, 8wt% of nitrite, 3wt% of orthophosphate, 2wt% of silicate, 1wt% of borate, 3wt% of sodium benzoate and 10wt% of triethanolamine, and the base liquid is distilled water.
Test example
The effect comparison is carried out by taking the example 1 as an example and comparing the results with the comparative examples 1-2:
the corrosion inhibitor in the embodiment 1 has a pH value of 7.5 and the corrosion inhibitor in the comparative example 1 has a pH value of 7.0, which are neutral by using a pH meter for test comparison; while comparative example 2, which has a pH of 11, exhibits a strong basicity, which causes severe corrosion of the magnetic refrigeration system.
FIG. 1 shows a typical La (Fe, si) 13 And a comparison graph of the surface appearance of the basic magnetic refrigeration material before and after the basic magnetic refrigeration material is soaked in the corrosion inhibitor obtained in the example 1, the comparative example 1 and the comparative example 2 for 1 day. As can be seen, la (Fe, si) 13 After the basic magnetic refrigeration material is soaked in the deionized water of the comparative example 1 and the corrosion inhibitor of the comparative example 2 for 1 day, obvious corrosion phenomena appear on the surface. Before and after the corrosion inhibitor of the embodiment 1 is soaked, the surface appearance is basically kept consistent, and obvious corrosion does not occur.
FIG. 2 shows a typical La (Fe, si) 13 Electric polarization curves of the basic magnetic refrigeration material in example 1 and comparative example 1 respectively. As can be seen, in the deionized water of comparative example 1, the corrosion current density of the material is 17.21 muA/cm 2 While the corrosion current density in the corrosion inhibitor of example 1 is 1.33 muA/cm 2 Significantly lower than the results of comparative example 1, it is well known to those skilled in the art that the lower the corrosion current density, the better the corrosion inhibition.
The significantly lower current density of example 1 indicates good corrosion inhibition performance.
FIG. 3 shows a typical La (Fe, si) 13 The basic magnetic refrigeration material has a corrosion rate of 504 hours when soaked in example 1 and comparative example 1 respectively. As can be seen from the graph, the corrosion rate in comparative example 1 is 0.25g/m 2 h. Although the corrosion rate of the magnetic refrigeration material in the comparative example 2 is lower than that of the comparative example 1, the problems that the component proportion is complex, and the pH value is too high, so that the magnetic refrigeration system is seriously corroded exist. While the corrosion rate of the sample in example 1 was only 8.5X 10 －4 g/m 2 h, much lower than the corrosion rate of the sample in comparative example 1, and also significantly lower than 0.005g/m 2 h, the corrosion inhibitor in the embodiment 1 has high corrosion inhibition effect.
The above embodiments are only used for illustrating but not limiting the technical solutions of the present invention, and although the above embodiments describe the present invention in detail, those skilled in the art should understand that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and any modifications and equivalents may fall within the scope of the claims.
Claims (8)
1. The high-efficiency corrosion inhibitor for the magnetic refrigeration material is characterized by comprising at least 3 of the following components: na (Na) 2 MoO 4 ·2H 2 O、Na 2 HPO 4 ·12H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 SiO 3 ·9H 2 O、NaH 2 PO 4 、Na 2 CO 3 、NaNO 2 、K 2 CrO 7 、ZnSO 4 (ii) a The pH value of the high-efficiency corrosion inhibitor is 6-8;
wherein, with respect to the base liquid water, na 2 MoO 4 ·2H 2 The concentration of O is 0 to 20g/L, na 2 HPO 4 ·12H 2 The concentration of O is 0 to 20g/L, na 2 B 4 O 7 ·10H 2 The concentration of O is 0 to 20g/L; na (Na) 2 SiO 3 ·9H 2 The concentration of O is 0 to 10g/L, naH 2 PO 4 Has a concentration of 0 to 10g/L, na 2 CO 3 The concentration of (A) is 0-10 g/L, naNO 2 The concentration of (b) is 0-10 g/L, K 2 CrO 7 Concentration of (2)0 to 10g/L, znSO 4 The concentration of (A) is 0 to 10g/L.
2. The high-efficiency corrosion inhibitor according to claim 1, which is characterized by comprising the following components: na (Na) 2 MoO 4 ·2H 2 O、Na 2 HPO 4 ·12H 2 O and NaH 2 PO 4 Relative to the base liquid water, na 2 MoO 4 ·2H 2 The concentration of O is 1-5 g/L, na 2 HPO 4 ·12H 2 The concentration of O is 0.5 to 4g/L, naH 2 PO 4 The concentration of (B) is 0.1-1.5 g/L.
3. The high-efficiency corrosion inhibitor according to claim 1, which is characterized by comprising the following components: na (Na) 2 MoO 4 ·2H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 SiO 3 ·9H 2 O and NaH 2 PO 4 Relative to the base liquid water, na 2 MoO 4 ·2H 2 The concentration of O is 1-5 g/L, na 2 B 4 O 7 ·10H 2 The concentration of O is 1-3 g/L, na 2 SiO 3 ·9H 2 The concentration of O is 1 to 3g/L, naH 2 PO 4 The concentration of (b) is 1 to 3g/L.
4. The high-efficiency corrosion inhibitor according to claim 1, which is characterized by comprising the following components: na (Na) 2 MoO 4 ·2H 2 O、Na 2 HPO 4 ·12H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 CO 3 And NaNO 2 (ii) a Relative to the base liquid water, na 2 MoO 4 ·2H 2 The concentration of O is 3-7 g/L, na 2 HPO 4 ·12H 2 The concentration of O is 0.5-3 g/L, na 2 B 4 O 7 ·10H 2 The concentration of O is 1-6 g/L, na 2 CO 3 The concentration of (A) is 7-15 g/L, naNO 2 The concentration of (A) is 0.5-4 g/L.
5. The high-efficiency corrosion inhibitor according to claim 1, which is characterized by comprising the following components: na (Na) 2 HPO 4 ·12H 2 O、Na 2 B 4 O 7 ·10H 2 O、Na 2 SiO 3 ·9H 2 O、NaH 2 PO 4 、K 2 CrO 7 、ZnSO 4 (ii) a Relative to the base liquid water, na 2 HPO 4 ·12H 2 The concentration of O is 1 to 3g/L, na 2 B 4 O 7 ·10H 2 The concentration of O is 4-6 g/L, na 2 SiO 3 ·9H 2 The concentration of O is 7 to 9g/L, naH 2 PO 4 Has a concentration of 5-7 g/L, K 2 CrO 7 The concentration of (b) is 11-13 g/L, znSO 4 The concentration of (B) is 0.1-1 g/L.
6. The high-efficiency corrosion inhibitor according to claim 1, wherein the magnetic refrigeration material is La (Fe, si) 13 MnFe (P, X) (X = Si or Ge), gd or Gd 5 (Si,Ge) 4 A basic magnetic refrigeration material.
7. The high-efficiency corrosion inhibitor according to claim 1, wherein the corrosion current density value of the magnetic refrigeration material after being soaked for 500 hours by the high-efficiency corrosion inhibitor is 0-5 μ A/cm 2 Rate of corrosion<0.005g/m 2 h。
8. Use of the high-efficiency corrosion inhibitor according to any one of claims 1 to 7 for corrosion protection of magnetic refrigeration materials.
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