A gas phase corrosion inhibitor suitable for high temperature gas-cooled reactor steam generator and its preparation method

Abstract

The present invention provides a vapor-phase corrosion inhibitor suitable for a high-temperature gas-cooled reactor steam generator and a preparation method thereof. The vapor-phase corrosion inhibitor comprises the following components, measured in weight percentage: 50-70 wt% of a main corrosion inhibitor, 20-40 wt% of a phosphoric acid corrosion inhibitor, 2-5 wt% of a surfactant, and 5-10 wt% of a corrosion inhibitor aid. The main corrosion inhibitor is a mixture of cyclohexylamine carbonate, sodium benzoate, and ammonium phosphate; the surfactant is sodium octadecyl sulfate or sodium dodecylsulfonate; and the corrosion inhibitor aid is octadecylamine. The vapor-phase corrosion inhibitor of the present invention has a good corrosion inhibition effect and good compatibility with metals, thereby achieving long-term rust protection for metals. The preparation process of the vapor-phase corrosion inhibitor is simple and easy to operate.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas phase rust prevention, and in particular, relates to a gas phase corrosion inhibitor suitable for a high temperature gas-cooled reactor steam generator and a preparation method thereof. Background Art

[0002] Steam generators utilize a modular design. Each steam generator consists of multiple heat exchange modules, each containing multiple heat exchange tubes arranged in the annular space between the outer sleeve and the central tube. The steam generator heat exchange tubes utilize a spiral structure, with each heat exchange unit comprised of multiple layers of spiral tubes. Therefore, high-temperature gas-cooled reactor steam generators place high demands on corrosion protection, effectively preventing stress corrosion cracking (SC) in the steam generator heat transfer tubes caused by the accumulation of corrosion products.

[0003] To improve economic efficiency, high-temperature gas-cooled reactors (HTGRs) are typically configured as dual or multiple reactors with one turbine. This means that steam generated by two or more steam generators drives a single turbine generator. During operation, if a single reactor fails and requires shutdown for maintenance, the secondary side of the corresponding steam generator must be maintained to prevent internal corrosion.

[0004] In recent years, vapor-phase corrosion inhibitors have developed rapidly and are widely used. Compared with conventional corrosion protection methods, the main advantage of vapor-phase corrosion inhibitors is that they can reach the entire surface of the metal through the vapor phase, including narrow areas such as gaps, making them very suitable for pipelines and equipment under maintenance or sealed. However, with the development of vapor-phase rust prevention technology, people have put forward higher requirements for the corrosion inhibition performance and compatibility of vapor-phase corrosion inhibitors with metals. Therefore, there is an urgent need to develop vapor-phase corrosion inhibitors with excellent corrosion inhibition performance and good compatibility with metals to achieve long-term and effective rust protection for metals. Summary of the Invention

[0005] The present invention aims to at least partially address one of the technical problems in the related art. To this end, embodiments of the present invention provide a vapor-phase corrosion inhibitor suitable for use in a high-temperature gas-cooled reactor steam generator and a preparation method thereof, thereby improving the rust prevention performance of the high-temperature gas-cooled reactor steam generator and enabling long-term rust prevention of the high-temperature gas-cooled reactor steam generator.

[0006] In one aspect, an embodiment of the present invention provides a vapor-phase corrosion inhibitor suitable for a high-temperature gas-cooled reactor steam generator, comprising the following components: 50-70 wt% of a main corrosion inhibitor, 20-40 wt% of a phosphoric acid corrosion inhibitor, 2-5 wt% of a surfactant, and 5-10 wt% of a corrosion inhibitor aid, calculated in weight percentage;

[0007] Wherein, the main corrosion inhibitor is a mixture of cyclohexylamine carbonate, sodium benzoate and ammonium phosphate;

[0008] The surfactant is sodium octadecyl sulfate or sodium dodecyl sulfate;

[0009] The corrosion inhibitor is octadecylamine.

[0010] In the vapor-phase corrosion inhibitor provided by the embodiment of the present invention, the main corrosion inhibitor, phosphoric acid corrosion inhibitor, surfactant and corrosion inhibitor aid promote each other, greatly improving the corrosion inhibition effect and effectively inhibiting the corrosion of metals; and octadecylamine is used as a corrosion inhibitor aid. Since it is insoluble in water, it can form a single molecule or multi-molecule film on the metal surface, thereby playing the role of barrier isolation, preventing the dissolved oxygen in the water from contacting the metal surface, avoiding metal corrosion; and octadecylamine forms a uniform film and has a long protection time, and can also play a corrosion inhibition role even when the seal is not tight.

[0011] In some embodiments of the present invention, the mass ratio of the cyclohexylamine carbonate to the sodium benzoate and the ammonium phosphate is 2:(1.5-2):1, preferably 2:1.5:1.

[0012] In some embodiments of the present invention, the phosphoric acid corrosion inhibitor is any one of cyclohexylamine phosphate, ethylenediaminetetramethylenephosphonic acid or aminomethylphosphonic acid, preferably cyclohexylamine phosphate.

[0013] In some embodiments of the present invention, the surfactant is preferably sodium dodecyl sulfate.

[0014] Another embodiment of the present invention further provides a method for preparing the above-mentioned vapor phase corrosion inhibitor, comprising the following steps:

[0015] S1: Dissolve the main corrosion inhibitor in distilled water and stir for 10-20 minutes to obtain solution A;

[0016] S2: Dissolve the phosphoric acid corrosion inhibitor in distilled water and stir for 10 to 20 minutes to obtain solution B;

[0017] S3: Dissolve the surfactant in distilled water and stir for 10-20 minutes to obtain solution C;

[0018] S4: Weigh the corrosion inhibitor in proportion and heat it to 50-80°C for 10-20 minutes to obtain solution D;

[0019] S5: stirring and mixing solution A, solution B, solution C and solution D at 50-80° C. for 30-60 minutes to obtain the vapor phase corrosion inhibitor.

[0020] The preparation method of the vapor-phase corrosion inhibitor of the embodiment of the present invention is simple, easy to operate, does not require complex reaction equipment, has low manufacturing cost, and has mild reaction conditions; the vapor-phase corrosion inhibitor prepared by the preparation method of the embodiment of the present invention has good corrosion inhibition effect and good compatibility with metals, and can achieve long-term rust protection for metals.

[0021] In some embodiments of the present invention, in step S1, the mass ratio of the primary corrosion inhibitor to the distilled water is 1:5 to 1:10.

[0022] In some embodiments of the present invention, in step S2, the mass ratio of the phosphoric acid corrosion inhibitor to the distilled water is 1:5 to 1:10.

[0023] In some embodiments of the present invention, in step S3, the mass ratio of the surfactant to the distilled water is 1:3 to 1:5.

[0024] Another aspect of the embodiments of the present invention further provides the use of the above-mentioned vapor phase corrosion inhibitor in corrosion inhibition of a high temperature gas-cooled reactor steam generator.

[0025] The advantages and beneficial effects of the present invention are:

[0026] In the vapor phase corrosion inhibitor of the embodiment of the present invention, the components promote each other, improve the corrosion inhibition effect, can effectively inhibit the corrosion of metals, have good corrosion inhibition performance, and have good compatibility with metals, which can achieve long-term rust protection for metals; and the preparation method of the vapor phase corrosion inhibitor is simple, easy to operate, and suitable for large-scale industrial production. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a portion of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments derived by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] Unless otherwise defined, technical or scientific terms used in the present invention shall have the same meaning as commonly understood by persons having ordinary skills in the field to which the present invention belongs.

[0029] Where values are described herein as ranges, it should be understood that such disclosure includes disclosure of all possible sub-ranges within that range, as well as specific values falling within that range, regardless of whether a specific value or sub-range is explicitly stated.

[0030] In one aspect, an embodiment of the present invention provides a vapor-phase corrosion inhibitor suitable for a high-temperature gas-cooled reactor steam generator, comprising the following components: 50-70 wt% of a main corrosion inhibitor, 20-40 wt% of a phosphoric acid corrosion inhibitor, 2-5 wt% of a surfactant, and 5-10 wt% of a corrosion inhibitor aid, calculated in weight percentage;

[0031] Among them, the main corrosion inhibitor is a mixture of cyclohexylamine carbonate, sodium benzoate and ammonium phosphate;

[0032] The surfactant is sodium octadecyl sulfate or sodium dodecyl sulfate;

[0033] The corrosion inhibitor is octadecylamine.

[0034] The vapor phase corrosion inhibitor in the embodiment of the present invention consists of two parts: a polar group and a non-polar hydrophobic group. Among them, the main corrosion inhibitor and the phosphoric acid corrosion inhibitor have polar groups (oxygen atoms containing lone electron pairs), which can provide lone pairs of electrons, thereby hybridizing with the d empty orbitals of Fe to form coordination bonds, adsorbing on the metal surface, changing the double electric layer structure of the metal surface, and thus increasing the activation energy of the metal ionization process and reducing the corrosion rate of the metal; and octadecylamine is used as a corrosion inhibitor, which has a non-polar hydrophobic group (hydrocarbon group), which can separate the corrosive medium from the metal surface, hinder the transfer process of charge and (or) substances related to the corrosion reaction, and reduce the corrosion rate of the metal; and octadecylamine is insoluble in water and can form a single molecule or multi-molecule film on the metal surface, which acts as a barrier isolation to prevent the dissolved oxygen in the water from contacting the metal surface; and octadecylamine has a uniform film formation and a long protection time, and can play a corrosion inhibition role even in the case of loose sealing; in addition, by adding a surfactant to the vapor phase corrosion inhibitor in the embodiment of the present invention, the hydrophobicity of the metal to water can be increased, thereby reducing the adsorption of water on the metal surface and further reducing the corrosion rate of the metal.

[0035] In some specific embodiments, the mass ratio of cyclohexylamine carbonate to sodium benzoate and ammonium phosphate is 2:(1.5-2):1, non-limiting examples include: 2:1.5:1, 2:1.8:1, 2:2:1, etc., preferably 2:1.5:1.

[0036] In some specific embodiments, the phosphoric acid corrosion inhibitor is any one of cyclohexylamine phosphate, ethylenediaminetetramethylenephosphonic acid or aminomethylphosphonic acid, preferably cyclohexylamine phosphate.

[0037] In some specific embodiments, the surfactant is preferably sodium dodecyl sulfate.

[0038] Another embodiment of the present invention further provides a method for preparing the above-mentioned vapor phase corrosion inhibitor, comprising the following steps:

[0039] S1: Dissolve the main corrosion inhibitor in distilled water and stir for 10-20 minutes to obtain solution A;

[0040] S2: Dissolve the phosphoric acid corrosion inhibitor in distilled water and stir for 10 to 20 minutes to obtain solution B;

[0041] S3: Dissolve the surfactant in distilled water and stir for 10-20 minutes to obtain solution C;

[0042] S4: Weigh the corrosion inhibitor in proportion and heat it to 50-80°C for 10-20 minutes to obtain solution D;

[0043] S5: stirring and mixing solution A, solution B, solution C and solution D at 50-80° C. for 30-60 minutes to obtain the vapor phase corrosion inhibitor.

[0044] The preparation method of the vapor phase corrosion inhibitor of the embodiment of the present invention is simple, does not require complex reaction equipment, and has mild reaction conditions. The vapor phase corrosion inhibitor prepared by the preparation method of the embodiment of the present invention has good corrosion inhibition effect and good compatibility with metals, and can achieve long-term rust protection for metals.

[0045] In some specific embodiments, in step S1, the mass ratio of the main corrosion inhibitor to distilled water is 1:5 to 1:10, non-limiting examples include: 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, etc.

[0046] In some specific embodiments, in step S2, the mass ratio of the phosphoric acid corrosion inhibitor to distilled water is 1:5 to 1:10, non-limiting examples include: 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, etc.

[0047] In some specific embodiments, in step S3, the mass ratio of the surfactant to distilled water is 1:3 to 1:5, non-limiting examples include 1:3, 1:4, 1:5, etc.

[0048] Another aspect of the embodiments of the present invention further provides the use of the above-mentioned vapor phase corrosion inhibitor in corrosion inhibition of a high temperature gas-cooled reactor steam generator.

[0049] The technical solutions of the present invention are further described in detail below with reference to specific examples. Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

[0050] Example 1

[0051] This embodiment provides a vapor phase corrosion inhibitor suitable for a high temperature gas-cooled reactor steam generator. The vapor phase corrosion inhibitor includes the following components (in weight percentage):

[0052]

[0053]

[0054] The preparation method of the vapor phase corrosion inhibitor comprises the following steps:

[0055] S1: Weigh the main corrosion inhibitor in proportion and dissolve it in distilled water (wherein the mass ratio of the main corrosion inhibitor to distilled water is 1:10), and stir for 20 minutes to obtain solution A;

[0056] S2: Weigh cyclohexyl phosphate in proportion and dissolve it in distilled water (wherein the mass ratio of cyclohexyl phosphate to distilled water is 1:5), and stir for 10 minutes to obtain solution B;

[0057] S3: Weigh sodium octadecyl sulfate in proportion and dissolve it in distilled water (wherein the mass ratio of sodium octadecyl sulfate to distilled water is 1:3), and stir for 10 minutes to obtain solution C;

[0058] S4: Weigh octadecylamine in proportion and heat it to 50° C. in a heat-collecting constant-temperature heating magnetic stirrer for 20 min to obtain solution D;

[0059] S5: Stir and mix the above solution A, solution B, solution C and solution D at 50° C. for 60 minutes to obtain the vapor phase corrosion inhibitor.

[0060] Example 2

[0061] This embodiment provides a vapor phase corrosion inhibitor suitable for a high temperature gas-cooled reactor steam generator. The vapor phase corrosion inhibitor includes the following components (in weight percentage):

[0062]

[0063] The preparation method of the vapor phase corrosion inhibitor comprises the following steps:

[0064] S1: Weigh the main corrosion inhibitor in proportion and dissolve it in distilled water (wherein the mass ratio of the main corrosion inhibitor to distilled water is 1:8), and stir for 18 minutes to obtain solution A;

[0065] S2: Weigh ethylenediaminetetramethylenephosphoric acid (EDTP) in proportion and dissolve it in distilled water (wherein the mass ratio of EDTP to distilled water is 1:6), and stir for 12 minutes to obtain solution B;

[0066] S3: Weigh sodium lauryl sulfate in proportion and dissolve it in distilled water (wherein the mass ratio of sodium lauryl sulfate to distilled water is 1:4), and stir for 12 minutes to obtain solution C;

[0067] S4: Weigh octadecylamine in proportion and heat it to 60° C. in a heat-collecting constant-temperature heating magnetic stirrer for 15 minutes to obtain solution D;

[0068] S5: Stir and mix the above solution A, solution B, solution C and solution D at 50° C. for 30 minutes to obtain the vapor phase corrosion inhibitor.

[0069] Example 3

[0070] This embodiment provides a vapor phase corrosion inhibitor suitable for a high temperature gas-cooled reactor steam generator. The vapor phase corrosion inhibitor includes the following components (in weight percentage):

[0071]

[0072] The preparation method of the vapor phase corrosion inhibitor comprises the following steps:

[0073] S1: Weigh the main corrosion inhibitor in proportion and dissolve it in distilled water (wherein the mass ratio of the main corrosion inhibitor to distilled water is 1:7), and stir for 15 minutes to obtain solution A;

[0074] S2: Weigh aminomethyl phosphoric acid in proportion and dissolve it in distilled water (wherein the mass ratio of aminomethyl phosphoric acid to distilled water is 1:7), and stir for 15 minutes to obtain solution B;

[0075] S3: Weigh sodium octadecyl sulfate in proportion and dissolve it in distilled water (wherein the mass ratio of sodium octadecyl sulfate to distilled water is 1:5), and stir for 15 minutes to obtain solution C;

[0076] S4: Weigh octadecylamine in proportion and heat it to 70° C. in a heat-collecting constant-temperature heating magnetic stirrer for 15 minutes to obtain solution D;

[0077] S5: Stir and mix the above solution A, solution B, solution C and solution D at 60° C. for 50 minutes to obtain the vapor phase corrosion inhibitor.

[0078] Example 4

[0079] This embodiment provides a vapor phase corrosion inhibitor suitable for a high temperature gas-cooled reactor steam generator. The vapor phase corrosion inhibitor includes the following components (in weight percentage):

[0080]

[0081]

[0082] The preparation method of the vapor phase corrosion inhibitor comprises the following steps:

[0083] S1: Weigh the main corrosion inhibitor in proportion and dissolve it in distilled water (wherein the mass ratio of the main corrosion inhibitor to distilled water is 1:6), and stir for 12 minutes to obtain solution A;

[0084] S2: Weigh cyclohexyl phosphate in proportion and dissolve it in distilled water (wherein the mass ratio of cyclohexyl phosphate to distilled water is 1:8), and stir for 12 minutes to obtain solution B;

[0085] S3: Weigh sodium lauryl sulfate in proportion and dissolve it in distilled water (wherein the mass ratio of sodium lauryl sulfate to distilled water is 1:5), and stir for 12 minutes to obtain solution C;

[0086] S4: Weigh octadecylamine in proportion and heat it to 80° C. in a heat-collecting constant-temperature heating magnetic stirrer for 12 minutes to obtain solution D;

[0087] S5: Stir and mix the above solution A, solution B, solution C and solution D at 70° C. for 40 minutes to obtain the vapor phase corrosion inhibitor.

[0088] Example 5

[0089] This embodiment provides a vapor phase corrosion inhibitor suitable for a high temperature gas-cooled reactor steam generator. The vapor phase corrosion inhibitor includes the following components (in weight percentage):

[0090]

[0091] The preparation method of the vapor phase corrosion inhibitor comprises the following steps:

[0092] S1: Weigh the main corrosion inhibitor in proportion and dissolve it in distilled water (wherein the mass ratio of the main corrosion inhibitor to distilled water is 1:5), stir for 10 minutes to obtain solution A;

[0093] S2: Weigh ethylenediaminetetramethylenephosphoric acid (EDTP) in proportion and dissolve it in distilled water (wherein the mass ratio of EDTP to distilled water is 1:5), and stir for 10 minutes to obtain solution B;

[0094] S3: Weigh sodium lauryl sulfate in proportion and dissolve it in distilled water (wherein the mass ratio of sodium lauryl sulfate to distilled water is 1:5), and stir for 10 minutes to obtain solution C;

[0095] S4: Weigh octadecylamine in proportion and heat it to 60° C. in a heat-collecting constant-temperature heating magnetic stirrer for 15 minutes to obtain solution D;

[0096] S5: Stir and mix the above solution A, solution B, solution C and solution D at 60° C. for 50 minutes to obtain the vapor phase corrosion inhibitor.

[0097] Test Example 1

[0098] With reference to GB / T 35491-2017 "Corrosion Inhibitors and Vapor-Phase Corrosion Inhibitors", a static coupon weight loss test was performed on the vapor-phase corrosion inhibitors prepared in Examples 1-5 of the present invention. Carbon steel metal was selected as the corrosion indicator, and the coupon experimental data was recorded. A 1L stoppered wide-mouth bottle was taken, and the vapor-phase corrosion inhibitor was placed in a reagent container and placed in the wide-mouth bottle. Three coupons of the same type of metal material were suspended by nylon thread and placed in the wide-mouth bottle. The ends of the nylon thread were tied to the bottle mouth. After tightening the rubber stopper, NaCl solution was injected into the bottle through a special syringe. At the same time, three coupons of the same type of metal material were taken and subjected to parallel blank tests according to the above method (without adding vapor-phase corrosion inhibitor). Then, the two stoppered wide-mouth bottles were placed in a temperature-controlled oven and the temperature was adjusted to 70°C. The start time was recorded, and the stop time was recorded after 72 hours. The coupons were taken out, the surface was treated, and then weighed. The corrosion rate and corrosion inhibition rate were obtained by calculation.

[0099] According to the above method, the vapor phase corrosion inhibitors obtained in Examples 1-5 were tested respectively, and the results are shown in Table 1.

[0100] Table 1 Corrosion inhibition performance data of the vapor phase corrosion inhibitors obtained in Examples 1-5

[0101] Serial number Sample <![CDATA[Corrosion rate g / (m 2 ·h)]]> Sustained release rate (%) 1 blank 0.3722 0 2 Example 1 0.0387 89.6％ 3 Example 2 0.0302 91.9％ 4 Example 3 0.0355 90.5％ 5 Example 4 0.0296 92.0％ 6 Example 5 0.0307 91.8％

[0102] The corrosion resistance of the vapor phase corrosion inhibitor is mainly characterized by the corrosion rate and the corrosion inhibition rate. The test data of the above examples show that the vapor phase corrosion inhibitors prepared in Examples 1 to 5 of the present invention have an average corrosion rate of only 0.03294 g / (m2) before and after 72 hours of reaction at 70°C and NaCl corrosive medium. 2 ·h), which is much lower than the corrosion rate of the comparative example of 0.3722g / (m 2 h); the average corrosion inhibition rate reaches 91.2% before and after 72 hours of reaction. The vapor phase corrosion inhibitor of the present invention has good corrosion inhibition performance for carbon steel and other materials, and has long-term vapor phase corrosion inhibition ability, which can achieve long-term and effective rust prevention for metals and other materials.

[0103] Test Example 2

[0104] With reference to GB / T 35491-2017 "Corrosion Inhibitors and Vapor-Phase Corrosion Inhibitors", a static coupon weight loss test was performed on the vapor-phase corrosion inhibitors prepared in Examples 1-5 of the present invention. Carbon steel metal was selected as the corrosion indicator, and the coupon test data was recorded. A 1L stoppered wide-mouth bottle was taken, and the vapor-phase corrosion inhibitor was placed in a reagent container and placed in the wide-mouth bottle. Three coupons of the same type of metal material were suspended by nylon thread and placed in the wide-mouth bottle. The ends of the nylon thread were tied to the bottle mouth. After tightening the rubber stopper, NaCl solution was injected into the bottle through a special syringe. At the same time, three coupons of the same type of metal material were taken and a parallel blank test was performed according to the above method (without adding vapor-phase corrosion inhibitor). Then, the above two stoppered wide-mouth bottles were placed in a temperature-controlled oven and the temperature was adjusted to 500°C. The start time was recorded, and the stop time was recorded after 72 hours. The coupons were taken out, the surface was treated, and then weighed. The corrosion rate and corrosion inhibition rate were obtained by calculation.

[0105] According to the above method, the vapor phase corrosion inhibitors obtained in Examples 1-5 were tested respectively, and the results are shown in Table 2.

[0106] Table 2 Corrosion inhibition performance data of the vapor phase corrosion inhibitors obtained in Examples 1-5

[0107] Serial number Sample <![CDATA[Corrosion rate g / (m 2 ·h)]]> Sustained release rate (%) 1 blank 0.8772 0 2 Example 1 0.2571 70.7％ 3 Example 2 0.2491 71.6％ 4 Example 3 0.2527 71.2％ 5 Example 4 0.2384 72.8％ 6 Example 5 0.2414 72.5％

[0108] The corrosion resistance of the vapor phase corrosion inhibitor is mainly characterized by the corrosion rate and the corrosion inhibition rate. The test data of the above examples show that the vapor phase corrosion inhibitors prepared in Examples 1 to 5 of the present invention have an average corrosion rate of only 0.2477 g / (m2) before and after 72 hours of reaction at 500°C and NaCl corrosive medium. 2 h), which is much lower than the corrosion rate of the comparative example of 0.8772 g / (m 2 h); the average corrosion inhibition rate reached 71.8% before and after 72 hours of reaction. The vapor-phase corrosion inhibitor of the present invention has excellent corrosion inhibition performance for carbon steel and other materials, and maintains long-term vapor-phase corrosion inhibition capability even at high temperatures, enabling long-term and effective rust prevention of high-temperature gas-cooled reactor steam generators.

[0109] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0110] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A gas phase corrosion inhibitor suitable for a high temperature gas-cooled reactor steam generator, characterized in that: The invention comprises the following components: 50-70 wt% of a main corrosion inhibitor, 20-40 wt% of a phosphoric acid corrosion inhibitor, 2-5 wt% of a surfactant, and 5-10 wt% of a corrosion inhibitor aid, calculated in weight percentage; wherein the main corrosion inhibitor is a mixture of cyclohexylamine carbonate, sodium benzoate, and ammonium phosphate, and the mass ratio thereof is 2:(1.5-2):1; the phosphoric acid corrosion inhibitor is any one of cyclohexylamine phosphate, ethylenediaminetetramethylenephosphoric acid, or aminomethylphosphonic acid; the surfactant is sodium octadecyl sulfate or sodium dodecylsulfonate; and the corrosion inhibitor aid is octadecylamine; The vapor phase corrosion inhibitor is prepared by a method comprising the following steps: S1: Dissolve the main corrosion inhibitor in distilled water and stir for 10-20 minutes to obtain solution A; S2: Dissolve the phosphoric acid corrosion inhibitor in distilled water and stir for 10 to 20 minutes to obtain solution B; S3: Dissolve the surfactant in distilled water and stir for 10-20 minutes to obtain solution C; S4: Weigh the corrosion inhibitor in proportion and heat it to 50-80°C for 10-20 minutes to obtain solution D; S5: stirring and mixing solution A, solution B, solution C and solution D at 50-80° C. for 30-60 minutes to obtain the vapor phase corrosion inhibitor.

2. The vapor phase corrosion inhibitor according to claim 1, characterized in that The mass ratio of the cyclohexylamine carbonate to the sodium benzoate and the ammonium phosphate is 2:1.5:

1.

3. The vapor phase corrosion inhibitor according to claim 1, characterized in that The surfactant is sodium lauryl sulfate.

4. The vapor phase corrosion inhibitor according to claim 1, characterized in that In step S1, the mass ratio of the main corrosion inhibitor to the distilled water is 1:5 to 1:

10.

5. The vapor phase corrosion inhibitor according to claim 1, characterized in that In step S2, the mass ratio of the phosphoric acid corrosion inhibitor to the distilled water is 1:5 to 1:

10.

6. The vapor phase corrosion inhibitor according to claim 1, characterized in that In step S3, the mass ratio of the surfactant to the distilled water is 1:3 to 1:

5.

7. Use of the vapor phase corrosion inhibitor according to any one of claims 1 to 6 in corrosion inhibition of a high temperature gas-cooled reactor steam generator.

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