CN115074738B - Environment-friendly multi-element composite vapor phase corrosion inhibitor and preparation method thereof - Google Patents
Environment-friendly multi-element composite vapor phase corrosion inhibitor and preparation method thereof Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims abstract description 115
- 230000007797 corrosion Effects 0.000 title claims abstract description 113
- 239000003112 inhibitor Substances 0.000 title claims abstract description 62
- 239000012808 vapor phase Substances 0.000 title claims abstract description 37
- 239000002131 composite material Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 claims abstract description 49
- 239000004299 sodium benzoate Substances 0.000 claims abstract description 49
- 235000010234 sodium benzoate Nutrition 0.000 claims abstract description 49
- 239000000176 sodium gluconate Substances 0.000 claims abstract description 46
- 235000012207 sodium gluconate Nutrition 0.000 claims abstract description 46
- 229940005574 sodium gluconate Drugs 0.000 claims abstract description 46
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims abstract description 45
- GTLQZNKUEFUUIS-UHFFFAOYSA-N carbonic acid;cyclohexanamine Chemical compound OC(O)=O.NC1CCCCC1 GTLQZNKUEFUUIS-UHFFFAOYSA-N 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000012071 phase Substances 0.000 claims abstract description 11
- 239000012153 distilled water Substances 0.000 claims abstract description 8
- 239000002904 solvent Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 30
- 239000002184 metal Substances 0.000 abstract description 30
- 230000005764 inhibitory process Effects 0.000 abstract description 22
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 9
- 239000010962 carbon steel Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 2
- 231100000086 high toxicity Toxicity 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 63
- 229910000831 Steel Inorganic materials 0.000 description 20
- 239000010959 steel Substances 0.000 description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- -1 hydroxyl ions Chemical class 0.000 description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 7
- 238000012216 screening Methods 0.000 description 7
- 238000001179 sorption measurement Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 239000011684 sodium molybdate Substances 0.000 description 6
- 235000015393 sodium molybdate Nutrition 0.000 description 6
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 description 6
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- 150000001412 amines Chemical class 0.000 description 4
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- 150000003841 chloride salts Chemical class 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 229910017108 Fe—Fe Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M nitrite group Chemical group N(=O)[O-] IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
Classifications
-
- 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
- C23F11/02—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in air or gases by adding vapour phase inhibitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention relates to the technical field of metal gas phase rust prevention, and discloses a green environment-friendly multi-element composite gas phase corrosion inhibitor and a preparation method thereof, wherein the multi-element composite gas phase corrosion inhibitor is prepared from sodium benzoate, sodium gluconate, cyclohexylamine carbonate and distilled water serving as solvents, and the mass-volume concentration of each component in the multi-element composite gas phase corrosion inhibitor is as follows: 8g/L-10g/L sodium benzoate, 8g/L-5g/L sodium gluconate, 4g/L-5g/L cyclohexylamine carbonate. The multielement composite vapor phase corrosion inhibitor is prepared by compounding sodium benzoate, sodium gluconate and cyclohexylamine carbonate, is environment-friendly, efficient and pollution-free to the environment, has excellent synergistic effect, solves the problems of poor slow release effect and high toxicity of the conventional vapor phase corrosion inhibitor, has a simple preparation method and convenient use, can improve the corrosion inhibition rate of carbon steel, and prolongs the service life of the carbon steel.
Description
Technical Field
The invention relates to the technical field of metal gas phase rust prevention, in particular to an environment-friendly multi-element composite gas phase corrosion inhibitor and a preparation method thereof.
Background
Atmospheric corrosive environments can generally be divided into three categories: marine, industrial and rural atmospheric corrosive environments. The temperature and humidity of the air, the oxygen content in the air is an atmospheric fundamental factor determining the atmospheric corrosion, and some impurities such as chlorides and sulfides in the air can also affect the atmospheric corrosion. Particularly in marine atmospheric corrosive environments, a large amount of chloride salts such as sodium chloride and magnesium chloride exist, and the like, have strong corrosiveness. Common chloride salts can increase electrolyte in a liquid film to accelerate corrosion, and Cl in the salt - Is the most common and important atmospheric corrosive substance, cl - Can react with ferrous ions of the metal anode to generate soluble matters to directly participate in electrochemical corrosion reaction, thereby accelerating the corrosion rate of the metal. Therefore, how to prevent serious atmospheric corrosion in marine environments is an important research in the field of marine rust prevention.
The vapor phase corrosion inhibitor, also called as volatile corrosion inhibitor VCIs (Volatile Corrosion Inhibitors), can volatilize automatically at normal temperature (with higher saturated vapor pressure) and is slowly adsorbed on the outer surface of metal in the form of small molecules or particles so as to isolate external harmful gases such as O 2 ,CO 2 ,SO 2 ,H 2 S and water vapor and other corrosion medium to contact the metal surface to reach the aim of rust prevention. Compared with the traditional anti-corrosion coating, the VCIs volatilize in the form of particles and are adsorbed to all parts of the metal surface to form a uniform and effective protective film, so that the protective film is not influenced by the shape and defects of a matrix, and the real omnibearing protection can be realized.
Vapor phase corrosion inhibition is a new strategy for metal protection, and the VCIs used usually contain polar or nonpolar groups. Wherein, N, O and other atoms in the polar group are combined with empty d orbits of metal atoms to form a protective film, so that active dissolution of matrix metal is inhibited, and meanwhile, the structure of an electric double layer is changed, so that the energy state of the metal surface tends to be stable, the activation energy of corrosion reaction is increased, and the corrosion speed is slowed down; the nonpolar groups are arranged on the metal surface in an oriented manner to form a hydrophobic protective layer which prevents charge or substance transfer associated with corrosion reactions. At present, most of the vapor phase corrosion inhibitors are single-component use, and the corrosion inhibition performance has certain limitation and poor slow release effect; and the gas phase corrosion inhibitor commonly used at present is nitrite gas phase corrosion inhibitor, which has toxicity and can cause environmental pollution.
Disclosure of Invention
The invention aims to overcome the defects existing in the prior art and provides a green and environment-friendly multi-element composite vapor phase corrosion inhibitor and a preparation method thereof.
In order to achieve the above object, the technical scheme of the present invention is as follows: the environment-friendly multi-element composite vapor phase corrosion inhibitor consists of sodium benzoate, sodium gluconate, cyclohexylamine carbonate and distilled water as solvents, wherein the mass-volume concentration of each component in the multi-element composite vapor phase corrosion inhibitor is as follows: 8g/L-10g/L sodium benzoate, 8g/L-5g/L sodium gluconate, 4g/L-5g/L cyclohexylamine carbonate.
The other technical scheme of the invention is as follows: the preparation method of the environment-friendly multi-element composite vapor phase corrosion inhibitor comprises the following steps:
1) According to the volume of the corrosion inhibitor required and the mass-volume concentration of each component: 8g/L-10g/L sodium benzoate, 8g/L-5g/L sodium gluconate and 4g/L-5g/L cyclohexylamine carbonate, and respectively weighing sodium benzoate, sodium gluconate and cyclohexylamine carbonate;
2) Dissolving the sodium benzoate, the sodium gluconate and the cyclohexylamine carbonate weighed in the step 1) with 1/3 volume of distilled water respectively, and uniformly stirring to obtain sodium benzoate solution, sodium gluconate solution and cyclohexylamine carbonate solution respectively;
3) And (3) respectively standing the sodium benzoate solution, the sodium gluconate solution and the cyclohexylamine carbonate solution obtained in the step (2), and then mixing and uniformly stirring the three solutions to obtain the multi-element composite vapor phase corrosion inhibitor.
Further; the stirring time in the step 2) is 5min.
Further; the standing time in the step 3) is 4-6min.
The corrosion inhibitor has the functions of the components:
sodium benzoate: when sodium benzoate is added into corrosive medium, benzoate is absorbed by sample/medium interfaceAttached corrosive Cl - Competing, corrosive Cl is reduced - Adsorption at the interface. Sodium benzoate itself is not oxidizing and has dissolved oxygen in the corrosive medium, which does not act as a corrosion inhibitor. Sodium benzoate is a strong alkali weak acid salt, and generates hydroxyl ions after hydrolysis, and the hydroxyl ions can react with the metal surface to form passivation oxide, so that the corrosion of carbon steel can be effectively prevented. The benzoate ions react with carbon steel to form stable complex of high-valence iron on the surface of the steel to form a corrosion inhibition film, thereby achieving the corrosion inhibition effect. The sodium benzoate can be combined with metal ions to form a layer of complex adsorption film on the surface of the metal to play a role in corrosion inhibition, fe is a transition metal element in VIII family, is influenced by valence electrons of the transition metal element, has the characteristic of very easy electron acceptance, and is easy to attract the group with lone pair electrons of the benzoate, and iron ions are easy to react with (C) 6 H 5 COO) - Binding to form a complex, the complexation reaction can be expressed as follows:
2(C 6 H 5 COO) - +Fe 2+ →Fe(C 6 H 5 COO) 2
3(C 6 H 5 COO) - +Fe 3+ →Fe(C 6 H 5 COO) 3
sodium gluconate: sodium gluconate is a cathode precipitation film type corrosion inhibitor and has the greatest advantage of being capable of being matched with Ca in water 2+ 、Fe 3+ The formed complex is adsorbed on the metal surface to form a protective film, so that the effect of inhibiting metal corrosion is achieved; particularly in neutral medium and alkaline medium, sodium gluconate has obvious coordination corrosion inhibition effect with Mo, si, P, W salt and other formulas, which can not reach the corrosion inhibition effect of other corrosion inhibitors on steel (iron), so that the corrosion inhibition effect of the composite corrosion inhibitor for metal is obviously improved.
Cyclohexylamine carbonate: cyclohexylamine carbonate is unstable and readily breaks down into amine and acid, which then each volatilize. When the amine is dissolved in water, a part of the amine is dissociated to generate quaternary ammonium ions and cations, when the potential of the metal surface is negative than that of zero charge, the quaternary ammonium ions are electrostatically attracted with the ammonium ions, and the ammonium ions are adsorbed in a cathode region to block H + Thereby suppressing cathode reactions; when the metal surface potential is positive to zero potential, the generated OH is generated during the hydrolysis of amine - Adsorption is firstly carried out on the metal surface, then quaternary ammonium ions are chemically adsorbed on the iron surface through lone electron pairs on N of the quaternary ammonium ions, and the adsorption occurs in an anode region, so that metal dissolution is prevented. The cyclohexylamine carbonate is used as a mixed corrosion inhibitor mainly for inhibiting cathode reaction, has good volatility, short induction period and high corrosion inhibition efficiency, can be independently used as a vapor phase corrosion inhibitor, but needs to be periodically supplemented with medicines or compounded with the vapor phase corrosion inhibitor with lower volatility due to larger consumption so as to prolong the effective service time.
The multielement composite vapor phase corrosion inhibitor is prepared by compounding sodium benzoate, sodium gluconate and cyclohexylamine carbonate, is environment-friendly, efficient and pollution-free to the environment, has excellent synergistic effect, solves the problems of poor slow release effect and high toxicity of the conventional vapor phase corrosion inhibitor, has a simple preparation method and convenient use, can improve the corrosion inhibition rate of carbon steel, and prolongs the service life of the carbon steel.
Drawings
FIG. 1 is a reference diagram of a gas phase corrosion inhibitor screening experiment;
FIG. 2 (a) is a schematic SEM image of the surface of a steel sheet without vapor phase corrosion inhibitor added to the NaCl solution for the screening test; (b) To screen the steel sheet surface and SEM image of the experimental NaCl solution added with the vapor phase corrosion inhibitor prepared in example 1;
FIG. 3 shows the surface of steel sheet with different vapor phase corrosion inhibitors added to the NaCl solution for discrimination experiment.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
Example 1:
the preparation method of the environment-friendly multi-element composite vapor phase corrosion inhibitor comprises the following steps:
1) According to the preparation of 1L of corrosion inhibitor, 8g of sodium benzoate, 8g of sodium gluconate and 4g of cyclohexylamine carbonate are respectively weighed;
2) Dissolving the sodium benzoate, the sodium gluconate and the cyclohexylamine carbonate weighed in the step 1) with 1/3L of distilled water respectively, and stirring for 5min to obtain sodium benzoate solution, sodium gluconate solution and cyclohexylamine carbonate solution respectively;
3) And (3) respectively standing the sodium benzoate solution, the sodium gluconate solution and the cyclohexylamine carbonate solution obtained in the step (2) for 4min, and then mixing and uniformly stirring the three solutions to obtain the aqueous solution.
Example 2:
the preparation method of the environment-friendly multi-element composite vapor phase corrosion inhibitor comprises the following steps:
1) Preparing 1L of corrosion inhibitor, and respectively weighing 9g of sodium benzoate, 6.5g of sodium gluconate and 4.5g of cyclohexylamine carbonate;
2) Dissolving the sodium benzoate, the sodium gluconate and the cyclohexylamine carbonate weighed in the step 1) with 1/3L of distilled water respectively, and stirring for 5min to obtain sodium benzoate solution, sodium gluconate solution and cyclohexylamine carbonate solution respectively;
3) And (3) respectively standing the sodium benzoate solution, the sodium gluconate solution and the cyclohexylamine carbonate solution obtained in the step (2) for 5min, and then mixing and uniformly stirring the three solutions to obtain the aqueous solution.
Example 3:
the preparation method of the environment-friendly multi-element composite vapor phase corrosion inhibitor comprises the following steps:
1) Preparing 1L of corrosion inhibitor, and respectively weighing 10g of sodium benzoate, 5g of sodium gluconate and 5g of cyclohexylamine carbonate;
2) Dissolving the sodium benzoate, the sodium gluconate and the cyclohexylamine carbonate weighed in the step 1) with 1/3L of distilled water respectively, and stirring for 5min to obtain sodium benzoate solution, sodium gluconate solution and cyclohexylamine carbonate solution respectively;
3) And (3) respectively standing the sodium benzoate solution, the sodium gluconate solution and the cyclohexylamine carbonate solution obtained in the step (2) for 6min, and then mixing and uniformly stirring the three solutions to obtain the aqueous solution.
Screening experiment:
the vapor phase corrosion inhibitor prepared in example 1 was used to protect carbon steel, and the corrosion rate (v) and corrosion inhibition rate (eta) of carbon steel before and after the screening experiment were determined using the formula v= (W) 1 -W 0 ) /(s×t) and η=(v 0 -v 1 )/v 0 X 100% for calculation:
v-corrosion rate, g/(m) 2 ·h)；
W 0 -initial weight of metal test piece, g;
W 1 the weight g of the metal test piece with corrosion products after corrosion;
s-surface area of metal test piece: 0.0008m 2 ；
t-time of corrosion, h;
v 1 corrosion rate of metal after addition of corrosion inhibitor g/(m) 2 ·h)；
v 0 Corrosion rate of metal without corrosion inhibitor g/(m) 2 ·h)。
The screening experiment method comprises the following steps: 0.5g of the vapor phase corrosion inhibitor is fully dissolved by using 50mL of NaCl solution (corrosive medium) with the mass fraction of 3.5% and is contained in a wide-mouth bottle, then a metal test piece is hung and fixed below a bottle mouth, the wide-mouth bottle is placed in a constant-temperature water bath, the water bath temperature is 50 ℃, heating is stopped for 16h and 24h is a period after heating for 8h, and the corrosion state of the metal test piece is checked after 72h, as shown in figure 1.
Comparison test:
no vapor phase corrosion inhibitor is added into the corrosive medium, and the following vapor phase corrosion inhibitors are respectively added: screening experiments are carried out on 0.5gMP solution, 0.5gMB solution, 0.5gMC solution, 0.5gBC solution, 0.5gBP solution, 0.5g PC solution and 0.5g BPC solution, the experimental results are shown in FIG. 2 and FIG. 3, the experimental data are shown in Table 1 and Table 2, and bare steel in the tables represents the non-aerated phase corrosion inhibitor in the corrosive medium; the MP solution is sodium molybdate/sodium gluconate water solution, wherein the concentration of sodium molybdate and sodium gluconate is 8g/L; the MB solution is sodium molybdate/sodium benzoate water solution, wherein the concentration of sodium molybdate and sodium benzoate is 8g/L; the MC solution is sodium molybdate/cyclohexylamine carbonate aqueous solution, wherein the concentration of sodium molybdate is 8g/L, and the concentration of cyclohexylamine carbonate is 4g/L; the BC solution is sodium benzoate/cyclohexylamine carbonate aqueous solution, wherein the concentration of sodium benzoate is 8g/L, and the concentration of cyclohexylamine carbonate is 4g/L; the BP solution is sodium benzoate/sodium gluconate aqueous solution, wherein the concentration of sodium benzoate and sodium gluconate is 8g/L; the PC solution is sodium gluconate/cyclohexylamine carbonate aqueous solution, wherein the concentration of the sodium gluconate is 8g/L and the concentration of the cyclohexylamine carbonate is 4g/L; the BPC solution is the vapor phase corrosion inhibitor prepared in example 1 of the invention.
Table 1 comparison of Corrosion inhibition rates after screening experiments
| Bare steel | BPC solution | MP solution | MB solution | MC solution | BC solution | BP solution | PC solution | |
| Day0(g) | 17.8648 | 17.8812 | 17.9044 | 17.8653 | 17.8998 | 17.8673 | 17.9319 | 18.0777 |
| Day3(g) | 17.8736 | 17.8816 | 17.9092 | 17.8669 | 17.9006 | 17.8679 | 17.9324 | 18.0789 |
| Weight gain (g) | 0.0088 | 0.0004 | 0.0024 | 0.0017 | 0.0018 | 0.0013 | 0.0012 | 0.0014 |
| Corrosion rate | 15.278％ | 0.714％ | 4.167％ | 2.951％ | 3.125％ | 2.257％ | 2.083％ | 2.431％ |
| Corrosion inhibition rate | 95.327％ | 72.725％ | 80.685％ | 79.546％ | 85.227％ | 86.366％ | 84.088％ |
Table 2 comparison of the content of O, N element on the surface of Steel sheet after the discrimination experiment
| O | N | |
| Bare steel | 30.62％ | |
| BPC solution | 9.73％ | 15.14％ |
FIG. 2 (a) is a SEM image of the surface of a steel sheet without vapor phase corrosion inhibitor added to the corrosive medium; (b) The surface of the steel sheet and SEM image of the vapor phase corrosion inhibitor prepared in example 1 were added to a corrosive medium. As can be seen from fig. 2, the surface of the steel sheet without the vapor phase corrosion inhibitor in the corrosion medium is attached with fluffy corrosion products, and scratches are blurred, which indicates that the corrosion degree is deeper; under the same conditions, only scratches are observed on the surface of the steel sheet after the vapor phase corrosion inhibitor prepared in the embodiment 1 is added, no corrosion phenomenon occurs, and the corrosion speed and the corrosion inhibition rate of the two are combined, so that the vapor phase corrosion inhibitor prepared in the embodiment 1 of the invention has excellent corrosion inhibition performance on carbon steel, and the corrosion inhibition rate can reach 95.327%.
FIG. 3 (a) shows the surface of a steel sheet with MP solution added to the corrosive medium; (b) adding MB solution to the surface of the steel sheet in the corrosive medium; (c) adding MC solution to the surface of the steel sheet in the corrosive medium; (d) adding BC solution to the surface of the steel sheet in the corrosive medium; (e) adding BP solution to the surface of the steel sheet in the corrosive medium; (f) the surface of the steel sheet to which the PC solution is added in the corrosive medium. It can be seen from fig. 3 that each steel sheet has corrosion phenomena to various degrees.
The data in table 1 and fig. 3 can illustrate that the two-by-two combination of sodium benzoate, sodium gluconate and cyclohexylamine carbonate has more excellent corrosion inhibition performance than the other two-by-two combination of the compound corrosion inhibitors, and the sodium benzoate and sodium gluconate compound system shows the most excellent corrosion inhibition performance in the two-by-two combination because of the synergistic effect between the sodium benzoate and sodium gluconate: the corrosion inhibition of sodium benzoate is caused by the adsorption of benzoate on the metal surface. When sodium benzoate is added into corrosive medium, benzoate and Cl - Generates competitive adsorption and weakens corrosive Cl - Adsorption at interface, cl - Can react with anode in atmospheric liquid film corrosion (Fe-Fe) 2+ +2e - ) The generated ferrous ions form soluble matters, which can lead to the aggravation of corrosion, thus Cl - Is a major factor in accelerating anodic corrosion, so benzoate weakens anodic corrosion; sodium gluconate has excellent chelating performance to Fe 3+ Particularly outstanding chelating performance, can form a complex protective film with iron ions in solution to cover the metal surface, and can prevent the reaction (O 2 +2H 2 O+4e - →4OH - ). Therefore, sodium benzoate and sodium gluconate can synergistically inhibit the anode reaction and the cathode reaction in the atmospheric liquid film, and the excellent corrosion inhibition performance is shown.
The cyclohexylamine carbonate has good volatility and slow release, can be used as a pre-corrosion inhibitor after being compounded with sodium benzoate and sodium gluconate, and can realize optimal corrosion inhibition performance in cooperation with the sodium benzoate and the sodium gluconate.
The above-described embodiments are merely preferred embodiments of the present invention, and the present invention is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (4)
1. The environment-friendly multi-element composite vapor phase corrosion inhibitor is characterized in that: the multi-component composite gas phase corrosion inhibitor is composed of sodium benzoate, sodium gluconate, cyclohexylamine carbonate and distilled water as solvents, wherein the mass-volume concentration of each component is as follows: 8g/L-10g/L sodium benzoate, 8g/L-5g/L sodium gluconate, 4g/L-5g/L cyclohexylamine carbonate.
2. The preparation method of the environment-friendly multi-element composite vapor phase corrosion inhibitor is characterized by comprising the following steps of:
1) According to the volume of the corrosion inhibitor required and the mass-volume concentration of each component: 8g/L-10g/L sodium benzoate, 8g/L-5g/L sodium gluconate and 4g/L-5g/L cyclohexylamine carbonate, and respectively weighing sodium benzoate, sodium gluconate and cyclohexylamine carbonate;
2) Dissolving the sodium benzoate, the sodium gluconate and the cyclohexylamine carbonate weighed in the step 1) with 1/3 volume of distilled water respectively, and uniformly stirring to obtain sodium benzoate solution, sodium gluconate solution and cyclohexylamine carbonate solution respectively;
3) And (3) respectively standing the sodium benzoate solution, the sodium gluconate solution and the cyclohexylamine carbonate solution obtained in the step (2), and then mixing and uniformly stirring the three solutions to obtain the multi-element composite vapor phase corrosion inhibitor.
3. The method for preparing the environment-friendly multi-element composite vapor phase corrosion inhibitor according to claim 2, which is characterized in that: the stirring time in the step 2) is 5min.
4. The method for preparing the environment-friendly multi-element composite vapor phase corrosion inhibitor according to claim 2, which is characterized in that: the standing time in the step 3) is 4-6min.
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