CN114075670A - Corrosion inhibitor and application thereof - Google Patents
Corrosion inhibitor and application thereof Download PDFInfo
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- CN114075670A CN114075670A CN202111362193.1A CN202111362193A CN114075670A CN 114075670 A CN114075670 A CN 114075670A CN 202111362193 A CN202111362193 A CN 202111362193A CN 114075670 A CN114075670 A CN 114075670A
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- corrosion inhibitor
- corrosion
- hydroxyquinoline
- metal material
- carboxymethyl chitosan
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- 230000007797 corrosion Effects 0.000 title claims abstract description 219
- 239000003112 inhibitor Substances 0.000 title claims abstract description 121
- 230000005764 inhibitory process Effects 0.000 claims abstract description 56
- 239000007769 metal material Substances 0.000 claims abstract description 48
- 229920001661 Chitosan Polymers 0.000 claims abstract description 39
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims abstract description 39
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 31
- 230000002378 acidificating effect Effects 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 20
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- 150000003585 thioureas Chemical class 0.000 claims abstract description 20
- 150000004325 8-hydroxyquinolines Chemical class 0.000 claims abstract description 19
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011701 zinc Substances 0.000 claims abstract description 10
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 239000011574 phosphorus Substances 0.000 claims abstract description 6
- 239000002904 solvent Substances 0.000 claims abstract description 6
- RDBONSWKYPUHCS-UHFFFAOYSA-N 1-undecyl-4,5-dihydroimidazole Chemical compound CCCCCCCCCCCN1CCN=C1 RDBONSWKYPUHCS-UHFFFAOYSA-N 0.000 claims description 17
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 claims description 16
- LEEHHPPLIOFGSC-UHFFFAOYSA-N cyclohexylthiourea Chemical compound NC(=S)NC1CCCCC1 LEEHHPPLIOFGSC-UHFFFAOYSA-N 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 8
- MMUFAGXJPKNAHT-UHFFFAOYSA-N copper;quinolin-8-ol Chemical compound [Cu].C1=CN=C2C(O)=CC=CC2=C1 MMUFAGXJPKNAHT-UHFFFAOYSA-N 0.000 claims description 8
- GSNUNTMZZWSJCW-UHFFFAOYSA-N decylthiourea Chemical compound CCCCCCCCCCNC(N)=S GSNUNTMZZWSJCW-UHFFFAOYSA-N 0.000 claims description 7
- 125000000400 lauroyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 44
- 229910052751 metal Inorganic materials 0.000 abstract description 34
- 239000002184 metal Substances 0.000 abstract description 34
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 239000008367 deionised water Substances 0.000 description 12
- 229910021641 deionized water Inorganic materials 0.000 description 12
- 244000005700 microbiome Species 0.000 description 7
- 239000002131 composite material Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
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- 241000894006 Bacteria Species 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
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- 239000012153 distilled water Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
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- 239000002244 precipitate Substances 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 229920001817 Agar Polymers 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 241000295146 Gallionellaceae Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
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- 238000012258 culturing Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
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- 238000009826 distribution Methods 0.000 description 1
- 230000002289 effect on microbe Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- BVAQZSBSTBYZPX-UHFFFAOYSA-M sodium;2-[2-(dodecanoylamino)ethyl-(2-hydroxyethyl)-[2-hydroxy-3-[hydroxy(oxido)phosphoryl]oxypropyl]azaniumyl]acetate Chemical compound [Na+].CCCCCCCCCCCC(=O)NCC[N+](CCO)(CC([O-])=O)CC(O)COP(O)([O-])=O BVAQZSBSTBYZPX-UHFFFAOYSA-M 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
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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
- C23F11/08—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
- C23F11/10—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 organic inhibitors
Abstract
The invention belongs to the technical field of metal corrosion protection, and discloses a corrosion inhibitor and application thereof. A corrosion inhibitor for decreasing the corrosion speed of metallic material in acidic environment with Cl ions is prepared from carboxymethyl chitosan, 8-hydroxyquinoline salt, surfactant, thiourea derivative and solvent. The total mass concentration of the solute of the corrosion inhibitor is 0.1-0.7 g/L, and the raw material of the corrosion inhibitor does not contain phosphorus or zinc. The corrosion inhibitor disclosed by the invention is simple in composition, has a good corrosion inhibition effect in an acid chloride ion environment, can effectively slow down metal corrosion, and is high in environmental friendliness. After the metal material is soaked in the corrosion inhibitor provided by the invention, the corrosion in an acidic chloride ion environment can be effectively relieved.
Description
Technical Field
The invention belongs to the technical field of metal corrosion protection, and particularly relates to a corrosion inhibitor and application thereof.
Background
The metal corrosion is a structure that the metal material is acted by surrounding media to generate chemical or electrochemical multiphase reaction on a metal interface, which obviously reduces the mechanical properties of the metal material, such as strength, plasticity, toughness and the like, shortens the service life of the metal material and even causes catastrophic accidents. Corrosion protection of metals is therefore important for the use of metallic materials.
There are many methods for metal corrosion prevention, and the use of corrosion inhibitors is an effective measure for metal corrosion prevention, and the metal corrosion prevention effect can be achieved by adding only a very small amount. The main action mechanism of the corrosion inhibitor is to form a film on the metal surface to isolate the metal material from the corrosive medium and slow down the chemical reaction or electrochemical reaction between the metal material and the medium. The corrosion inhibitor can prevent the corrosion of the metal material, simultaneously can keep the original physical and mechanical properties of the metal material unchanged, and can be widely applied to the corrosion prevention of the metal material. The reasonable use of corrosion inhibitors is an effective method for preventing corrosion of metal materials. The corrosion inhibitor has good effect and higher economic benefit, and becomes a method which is widely applied in the corrosion prevention technology.
Although the corrosion inhibitor has excellent metal corrosion resistance, in order to achieve good corrosion resistance, the raw materials of the corrosion inhibitor usually contain elements harmful to the environment, and most of the corrosion inhibitors have unsatisfactory corrosion inhibition effect in an acid chloride ion environment.
Disclosure of Invention
The embodiment of the application provides a corrosion inhibitor, which solves the problems that the corrosion inhibitor in the prior art has great environmental pollution and has poor corrosion inhibition effect in an acid chloride ion environment, and the provided corrosion inhibitor has good corrosion inhibition effect in the acid chloride ion environment and has little environmental pollution.
The embodiment of the application provides a corrosion inhibitor for reducing the corrosion rate of a metal material in an acidic chloride ion corrosion environment, the raw materials comprise a solute and a solvent, the solute comprises carboxymethyl chitosan, 8-hydroxyquinoline salt, a surfactant and a thiourea derivative, the total mass concentration of the corrosion inhibitor solute is 0.1-0.7 g/L, and the raw materials of the corrosion inhibitor do not contain phosphorus or zinc.
Preferably, the 8-hydroxyquinoline salt comprises at least one of 8-hydroxyquinoline aluminum and 8-hydroxyquinoline copper, and the mass concentration of the 8-hydroxyquinoline salt is 0.01-0.1 g/L.
Preferably, the surfactant comprises at least one of undecylimidazoline, lauroyl amphoteric dipropionic acid or sodium lauroyl amphoteric PG-acetate phosphate, and the mass concentration of the surfactant is 0.02-0.1 g/L.
Preferably, the thiourea derivative comprises at least one of cyclohexyl thiourea and n-decyl thiourea, and the mass concentration of the thiourea derivative is 0.01-0.05 g/L.
Preferably, the mass concentration of the carboxymethyl chitosan is 0.05-0.5 g/L.
Preferably, the mass ratio of the carboxymethyl chitosan, the 8-hydroxyquinoline salt, the surfactant and the thiourea derivative is (5-50): (1-10): (2-10): (1-5).
The embodiment of the application also provides an application of the corrosion inhibitor, wherein the corrosion inhibitor is applied to corrosion inhibition treatment of the metal material in an acidic chloride ion environment, and specifically, the metal material is soaked in the corrosion inhibitor before being used and then is taken out for treatment, and the corrosion inhibitor endows the metal material with corrosion resistance in the acidic chloride ion environment.
In the embodiment of the application, the solute required by the corrosion inhibitor is simply mixed with the solvent to obtain the corrosion inhibitor.
In summary, the embodiments of the present application at least include the following beneficial effects:
1. the corrosion inhibitor provided by the embodiment of the application does not contain phosphorus or zinc, so that the problem of great environmental pollution caused by the corrosion inhibitor is solved, and the influence of the corrosion inhibitor on the environment is ensured to be small.
2. According to the corrosion inhibitor provided by the embodiment of the application, the carboxymethyl chitosan is compounded with other film forming components, so that the problem that the corrosion inhibitor has poor corrosion inhibition effect in an acidic chloride ion environment is solved, and the corrosion inhibitor has excellent corrosion inhibition effect in the acidic chloride ion environment.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following embodiments are described in detail and completely with reference to the specific examples. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to examples.
In order to solve the problems that the corrosion inhibitor has large environmental pollution and poor corrosion inhibition effect in an acidic chloride ion environment, the corrosion inhibitor is prepared by using raw materials which do not contain phosphorus or zinc elements and is compounded by a plurality of components, so that the corrosion inhibitor has good corrosion inhibition effect in the acidic chloride ion environment and is environment-friendly.
In an acid chloride ion environment, because the radius of chloride ions is small and the penetrating capacity is strong, the chloride ions can be adsorbed on the passivation film, oxygen atoms in the passivation film are squeezed out and combined with metal ions in the passivation film to form soluble chloride, finally, small etching pits are formed on specific points of newly exposed base metal in an enrichment mode, and meanwhile, the chloride ions can be enriched in the vicinity of the surrounding area to accelerate corrosion of metal materials. Therefore, the corrosion inhibitor which takes the protective film formed on the passivated metal surface as the main corrosion inhibition means can form a large amount of corrosion pit areas due to the local enrichment of chloride ions in the acidic chloride ion environment, thereby accelerating the corrosion of the metal material. And because chloride ions can be adsorbed on the metal material, corrosion pits can be formed on the protective film which is not compact enough, and the corrosion inhibition effect of the corrosion inhibitor is reduced. Therefore, in an acidic chloride ion environment, the corrosion inhibitor not only needs to form a deposition film and an adsorption film as main corrosion inhibition means, but also can form a compact protective film and prevent chloride ions from being locally enriched on the metal surface so as to achieve a good corrosion inhibition effect.
The embodiment of the application provides a corrosion inhibitor for reducing the corrosion rate of a metal material in an acidic chloride ion corrosion environment, the raw materials comprise a solute and a solvent, the solute comprises carboxymethyl chitosan, 8-hydroxyquinoline salt, a surfactant and a thiourea derivative, the total mass concentration of the corrosion inhibitor solute is 0.1-0.7 g/L, and the raw materials of the corrosion inhibitor do not contain phosphorus or zinc.
The corrosion inhibitor provided by the embodiment of the application uses carboxymethyl chitosan as a main corrosion inhibition film forming material, and the carboxymethyl chitosan is an amphoteric polyelectrolyte, is nontoxic and tasteless, and has excellent film forming property and water solubility. The carboxymethyl chitosan has good biocompatibility and degradability and good bacteriostatic action, the molecules contain amino and carboxyl, the electrolysis of acid groups is inhibited under the acidic condition, the electrolyte has positive charge, the amino is protonated in the acidic environment to form-NH+ 3The groups have strong adsorption effect on the metal surface, are easier to adsorb on the metal surface, and have higher corrosion inhibition efficiency. The carboxymethyl chitosan is easy to dissolve in water, forms precipitates after complexing with metal ions, and is adsorbed on the surface of a metal material through the group adsorption effect to form a precipitation film. Carboxymethyl chitosan contains-NH in its molecule2The groups of-OH, -COOH and the like can effectively coordinate metal ions and are separated out in a precipitation form, so that organic molecules are adsorbed on the metal surface to form a protective film, thereby inhibiting metal corrosion, reducing the adsorption of chloride ions on the metal surface and reducing the enrichment of chloride ions on the metal surface. The pure carboxymethyl chitosan has poor corrosion inhibition effect, so other components need to be added into the corrosion inhibitor to form a more compact composite protective film, and the corrosion inhibition effect of the corrosion inhibitor on metal materials is improved. The corrosion inhibitor is added with 8-hydroxyquinoline salt to inhibit the growth of microorganisms on the surface of the metal material, so that the corrosion of organisms on the metal material is slowed down; the surfactant is added to activate the surface of the metal material, so that the corrosion inhibitor is favorable for forming a protective film on the surface of the metal material, and the corrosion of the metal material is slowed down; thiourea derivatives are added to fill up the gaps of the protective film, so that a more compact protective film is formed, and the corrosion inhibition effect of the corrosion inhibitor is improved. In the embodiment of the application, the corrosion inhibitor has a minimum concentration value, and only if the concentration of the corrosion inhibitor is greater than the minimum concentration value, certain corrosion inhibition efficiency is achieved. The corrosion inhibition efficiency of the corrosion inhibitor is increased along with the increase of the concentration of the corrosion inhibitor, and when the concentration of the corrosion inhibitor reaches a certain value, the corrosion inhibition efficiency is maximizedThe value is obtained.
Preferably, the 8-hydroxyquinoline salt comprises at least one of 8-hydroxyquinoline aluminum and 8-hydroxyquinoline copper, and the mass concentration of the 8-hydroxyquinoline salt is 0.01-0.1 g/L.
In the natural environment, microorganisms participate in the corrosion process to cause generation and pitting corrosion of a large number of corrosion products, for example, growth and accumulation of flocculent fungi can hinder the flowing of a medium, so that the corrosion inhibitor cannot be uniformly dispersed on the metal surface, and some bacteria can even directly damage the corrosion inhibitor to change the corrosion inhibitor into a nutrient source of the microorganisms. Therefore, the corrosion inhibitor needs a certain amount of bacteriostatic substances to inhibit the growth of microorganisms and reduce the corrosion of the microorganisms to metal materials. Both 8-hydroxyquinoline aluminum and 8-hydroxyquinoline copper are 8-hydroxyquinoline salts and are less useful as corrosion inhibitors, 8-hydroxyquinoline aluminum is commonly used as a luminescent material, and 8-hydroxyquinoline copper is commonly used as an agricultural fungicide. The 8-hydroxyquinoline aluminum and the 8-hydroxyquinoline copper have high sterilization and algae removal functions, have strong inhibition effect on microorganisms, have certain film forming property, can form a precipitation film on the surface of metal, are favorable for forming a compact protective film, and can further slow down the corrosion of metal materials. And 8-hydroxyquinoline aluminum and 8-hydroxyquinoline copper have lower toxicity, have little influence on the environment, and the corrosion inhibitor has little pollution to the environment when in use.
Preferably, the surfactant comprises at least one of undecylimidazoline, lauroyl amphoteric dipropionic acid or sodium lauroyl amphoteric PG-acetate phosphate, and the mass concentration of the surfactant is 0.02-0.1 g/L.
The undecylimidazoline, the lauroyl amphoteric dipropionic acid and the sodium lauroyl amphoteric PG-acetate phosphate are used as surfactants, have good activated decontamination capability, can effectively clean and activate the metal surface, can still keep excellent surface activation performance in an acidic environment, are beneficial to film formation of a film-forming material on the metal material, and can slow down the metal corrosion effect. Undecylimidazoline, lauroyl amphoteric dipropionic acid and sodium lauroyl amphoteric PG-acetate phosphate have corrosion resistance, can form an adsorption film to help form a metal corrosion protection film while activating metal, wherein the undecylimidazoline can generate a synergistic effect with thiourea derivatives to further optimize the corrosion inhibition effect of the corrosion inhibitor. And the undecylimidazoline, the lauroyl amphoteric dipropionic acid and the sodium lauroyl amphoteric PG-acetate phosphate have low toxicity, good biodegradability, mild property and small environmental pollution, and can be matched with other surfactants to further reduce the irritation of other surfactants.
Preferably, the thiourea derivative comprises at least one of cyclohexyl thiourea and n-decyl thiourea, and the mass concentration of the thiourea derivative is 0.01-0.05 g/L.
The cyclohexyl thiourea and the n-decyl thiourea belong to thiourea derivatives, have carbon-nitrogen bonds and carbon-sulfur bonds, have excellent corrosion inhibition performance, can be adsorbed on the surface of a metal material to form a good corrosion inhibition protective film, have improved adsorption capacity in an acidic environment, and can effectively slow down the corrosion of the metal material in an acidic medium. Meanwhile, the cyclohexyl thiourea and the n-decyl thiourea can change the charge distribution on the metal surface, and generate a synergistic effect with the undecyl imidazoline, so that the undecyl imidazoline is easier to adsorb on the metal surface, the strong effect of inhibiting the metal corrosion is achieved, and a better corrosion inhibition effect is achieved. And the cyclohexyl thiourea and the n-decyl thiourea have small molecular weight, can be effectively adsorbed in gaps of the protective film formed by the carboxymethyl chitosan, and are compounded into a more compact and uniform protective film, so that the corrosion inhibitor can have excellent corrosion inhibition effect in an acid chloride ion environment.
Preferably, the mass concentration of the carboxymethyl chitosan is 0.05-0.5 g/L.
The corrosion inhibition effect of the carboxymethyl chitosan is limited by the concentration range, a protective film which can play a corrosion inhibition role cannot be formed due to too low concentration, the excessive carboxymethyl chitosan adsorbed on the metal surface can be caused due to too high concentration, the formed precipitate has too large amount and cannot be adsorbed on the metal surface, the protective film is caused to fall off, and the corrosion inhibition effect of the carboxymethyl chitosan is reduced.
Preferably, the mass ratio of the carboxymethyl chitosan, the 8-hydroxyquinoline salt, the surfactant and the thiourea derivative is (5-50): (1-10): (2-10): (1-5).
The four components used in the embodiment of the application, namely the carboxymethyl chitosan, the 8-hydroxyquinoline salt, the surfactant and the thiourea derivative, have certain film forming and corrosion inhibiting functions, and the four components cooperate with each other to enable the film forming process to be quicker and form a more compact composite protective film, so that the enrichment of chloride ions on the metal surface is reduced, the metal material is protected, and the corrosion inhibitor has a better corrosion inhibiting effect in an acidic chloride ion environment.
The embodiment of the application also provides an application of the corrosion inhibitor, wherein the corrosion inhibitor is applied to corrosion inhibition treatment of the metal material in an acidic chloride ion environment, specifically, the metal material is soaked in the corrosion inhibitor for treatment before being used, and the corrosion inhibitor endows the metal material with corrosion resistance in the acidic chloride ion environment.
The metal material corrosion inhibitor is convenient to use, the metal material is soaked in the corrosion inhibitor, the effective components of the carboxymethyl chitosan, the 8-hydroxyquinoline salt, the surfactant and the thiourea derivative in the corrosion inhibitor are cooperated with each other, the composite protective film is rapidly formed on the metal surface to protect the metal material, and the composite protective film can effectively slow down the corrosion of the metal material in an acidic chloride ion environment after being taken out. The formed composite protective film not only has the function of slowing down the corrosion of metal materials, but also can inhibit the reproduction of microorganisms to prevent the local enrichment of chloride ions and further slow down the corrosion of the metal materials.
The corrosion inhibitor provided by the embodiment of the application is simple to prepare, and can be prepared by putting the required solute into the solvent and uniformly mixing, so that the cost in the anti-corrosion treatment of the metal material can be greatly reduced.
The present invention will be further described with reference to specific examples, but the present invention is not limited to the examples.
Example 1
A corrosion inhibitor comprises raw materials of 0.05g of carboxymethyl chitosan, 0.02g of 8-hydroxyquinoline aluminum, 0.02g of undecyl imidazoline, 0.01g of cyclohexyl thiourea and 1000mL of deionized water.
Example 2
A corrosion inhibitor comprises raw materials of 0.5g of carboxymethyl chitosan, 0.1g of 8-hydroxyquinoline copper, 0.03g of lauroyl amphoteric dipropionic acid, 0.05g of n-decyl thiourea and 1000mL of deionized water.
Example 3
A corrosion inhibitor comprises raw materials of 0.5g of carboxymethyl chitosan, 0.06g of 8-hydroxyquinoline aluminum, 0.04g of undecyl imidazoline, 0.04g of cyclohexyl thiourea and 1000mL of deionized water.
Example 4
A corrosion inhibitor comprises raw materials of 0.3g of carboxymethyl chitosan, 0.05g of 8-hydroxyquinoline aluminum, 0.1g of sodium lauroampho PG-acetate phosphate, 0.04g of cyclohexyl thiourea and 1000mL of deionized water.
Comparative example 1
The raw materials of the corrosion inhibitor comprise 0.5g of carboxymethyl chitosan, 0.09g of undecyl imidazoline, 0.05g of cyclohexyl thiourea and 1000mL of deionized water.
Comparative example 2
A corrosion inhibitor comprises raw materials of 0.5g of carboxymethyl chitosan, 0.09g of 8-hydroxyquinoline aluminum, 0.05g of cyclohexyl thiourea and 1000mL of deionized water.
Comparative example 3
A corrosion inhibitor comprises raw materials of 0.5g of carboxymethyl chitosan, 0.08g of 8-hydroxyquinoline aluminum, 0.09g of undecyl imidazoline and 1000mL of deionized water.
Comparative example 4
A corrosion inhibitor comprises raw materials of 0.05g of carboxymethyl chitosan, 0.006g of 8-hydroxyquinoline aluminum, 0.004g of undecyl imidazoline, 0.004g of cyclohexyl thiourea and 1000mL of deionized water.
Comparative example 5
A corrosion inhibitor comprises raw materials of 0.5g of carboxymethyl chitosan, 0.6g of 8-hydroxyquinoline aluminum, 0.4g of undecyl imidazoline, 0.4g of cyclohexyl thiourea and 1000mL of deionized water.
Comparative example 6
The raw materials of the corrosion inhibitor comprise 5g of carboxymethyl chitosan, 0.06g of 8-hydroxyquinoline aluminum, 0.04g of undecyl imidazoline, 0.04g of cyclohexyl thiourea and 1000mL of deionized water.
Comparative example 7
A corrosion inhibitor comprises 0.5g of carboxymethyl chitosan and 1000mL of deionized water.
Comparative example 8
A corrosion inhibitor comprises raw materials of 0.06g of 8-hydroxyquinoline aluminum, 0.04g of undecyl imidazoline, 0.04g of cyclohexyl thiourea and 1000mL of deionized water.
Performance testing and results
And (3) performance testing:
1. and (3) testing the corrosion inhibition rate: 10 zinc-coated steel grounding materials with the diameter of 10mm and the length of 30mm are ground by a metallographic specimen pre-grinding machine and water sand paper with the meshes of 400 and 1000 until the surfaces are smooth, are washed by distilled water, are degreased by absolute ethyl alcohol and acetone, are placed in a dryer at room temperature, are dried for 24 hours, and are precisely weighed. 5 zinc-coated steel grounding materials are selected and put into a corrosion inhibitor to be soaked for 30 minutes, taken out and suspended into 0.1mol/L NaCl solution with pH of 4 acidified by dilute hydrochloric acid together with the rest zinc-coated steel grounding materials, and kept stand for 72 hours at the temperature of 20 ℃. And taking out the zinc-coated steel sample, removing rust, washing with distilled water, degreasing with absolute ethyl alcohol and acetone, blow-drying with electric blower, and accurately weighing. Average weight loss of the non-soaked corrosion inhibitor group is marked as G0Average weight loss of the immersion corrosion inhibitor group is marked as G1，
2. Microbial inhibition test: adding 10mL of corrosion inhibitor into 1000mL of iron bacteria culture solution with OD600 of 0.8, uniformly mixing, respectively coating 1mL of mixed culture solution in 10 agar culture media, placing in an incubator at 20 ℃ for culturing for 7 days, taking out after the culture is finished, and recording the average colony number of the culture media.
And (3) performance test results: the following are the results of the performance tests of examples 1 to 4 and comparative examples 1 to 5.
TABLE 1 Performance test results of examples 1 to 4 and comparative examples 1 to 5
The corrosion inhibitor provided by the embodiment of the application has a good corrosion inhibition effect, and the data in the table show that the corrosion inhibition rate is more than 98%, the metal corrosion phenomenon can be effectively relieved, the bacteriostasis effect is obvious, and the number of colonies is less than 30.
Compared with the examples, the corrosion inhibition rate is reduced because one component is absent in each of comparative examples 1 to 3. Compared with the embodiment, the 8-hydroxyquinoline salt is absent in the comparative example 1, and according to data in a table, the corrosion inhibition effect of the corrosion inhibitor is reduced to some extent, the corrosion inhibition rate is only 88.3%, and the corrosion inhibitor has almost no antibacterial effect on bacteria in an antibacterial test, so that the corrosion effect of microorganisms on metal materials is difficult to prevent. Compared with the embodiment, the comparative example 2 lacks the surfactant, the metal surface cannot be activated, the corrosion inhibitor cannot effectively form a protective film, the corrosion inhibition effect is reduced, and the data in the table show that the corrosion inhibition rate is only 67.5%. Compared with the examples, the thiourea derivative is absent in comparative example 3, and the rest components can not form a film effectively, and the data in the table shows that the corrosion inhibition rate is greatly reduced and is only 50.2%. In comparative examples 4 and 5, the mass concentration of the solute of the corrosion inhibitor was varied as compared to example 3. The mass concentration of the solute in the comparative example 4 is one tenth of the mass concentration of the solute in the corrosion inhibitor in the example 3, and the data in the table show that the corrosion inhibition effect of the corrosion inhibitor in the comparative example 4 is greatly reduced, the corrosion inhibition rate is close to that of the corrosion inhibitor without the thiourea derivative in the comparative example 3, the corrosion inhibition effect is not obvious, and the reduction of the content of the 8-hydroxyquinoline salt also causes the inhibition effect of the corrosion inhibitor to be reduced, and the slowing effect on microbial corrosion is greatly reduced. The mass concentration of the solute of the corrosion inhibitor in the comparative example 5 is ten times that of the corrosion inhibitor in the example 3, but the corrosion inhibition efficiency is unchanged according to the data in the table, and the corrosion inhibition effect reaches the upper limit. Compared with the examples, the mass concentration of carboxymethyl chitosan in comparative example 6 is too large, and the data in the table show that the corrosion inhibition effect of the corrosion inhibitor is reduced, which indicates that the corrosion inhibition effect of carboxymethyl chitosan has the best value within a certain concentration range. Compared with the examples, the data in the table show that the corrosion inhibition effect and the bacteriostasis effect of the corrosion inhibitor are reduced by only adding carboxymethyl chitosan in the comparative example 7, which shows that the pure carboxymethyl chitosan has the corrosion inhibition effect in the acidic chloride ion environment, but the effect is not good, so that the addition of other components in the corrosion inhibitor is necessary to improve the corrosion inhibition effect. Compared with the embodiment, the carboxymethyl chitosan is not added in the comparative example 8, according to the data in the table, the corrosion inhibition effect and the bacteriostasis effect of the corrosion inhibitor are also reduced, and the formed composite protective film is not enough to play a good corrosion inhibition role in an acidic chloride ion environment.
In summary, the corrosion inhibitor provided by the embodiment of the application has good corrosion inhibition effect, does not contain elements harmful to the environment, has high environmental protection degree, and meets the use requirement of the corrosion inhibitor.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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. A corrosion inhibitor for reducing the corrosion rate of a metal material in an acidic chloride ion corrosion environment, which is characterized in that:
the raw materials of the corrosion inhibitor comprise a solute and a solvent;
the solute comprises carboxymethyl chitosan, 8-hydroxyquinoline salt, a surfactant and a thiourea derivative;
the total mass concentration of the solute of the corrosion inhibitor is 0.1-0.7 g/L;
the raw materials of the corrosion inhibitor do not contain phosphorus or zinc elements.
2. The corrosion inhibitor of claim 1, wherein:
the 8-hydroxyquinoline salt comprises at least one of 8-hydroxyquinoline aluminum or 8-hydroxyquinoline copper.
3. The corrosion inhibitor of claim 1, wherein:
the mass concentration of the 8-hydroxyquinoline salt is 0.01-0.1 g/L.
4. The corrosion inhibitor of claim 1, wherein:
the surfactant comprises at least one of undecylimidazoline, lauroyl amphodipropionic acid or sodium lauroyl ampho PG-acetate phosphate.
5. The corrosion inhibitor of claim 1, wherein:
the mass concentration of the surfactant is 0.02-0.1 g/L.
6. The corrosion inhibitor of claim 1, wherein:
the thiourea derivative comprises at least one of cyclohexyl thiourea or n-decyl thiourea.
7. The corrosion inhibitor of claim 1, wherein:
the amount concentration of the thiourea derivative is 0.01-0.05 g/L.
8. The corrosion inhibitor of claim 1, wherein:
the mass concentration of the carboxymethyl chitosan is 0.05-0.5 g/L.
9. The corrosion inhibitor of claim 1, wherein:
the mass ratio of the carboxymethyl chitosan, the 8-hydroxyquinoline salt, the surfactant and the thiourea derivative is (5-50): (1-10): (2-10): (1-5).
10. Use of a corrosion inhibitor according to any one of claims 1 to 9, characterized in that:
the corrosion inhibitor is applied to corrosion inhibition treatment of the metal material in an acidic chloride ion environment, and specifically, the metal material is soaked in the corrosion inhibitor for treatment before use, and the corrosion inhibitor endows the metal material with corrosion resistance in the acidic chloride ion environment.
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