CN112390385A - Corrosion inhibitor and preparation method and application thereof - Google Patents
Corrosion inhibitor and preparation method and application thereof Download PDFInfo
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- CN112390385A CN112390385A CN202011182664.6A CN202011182664A CN112390385A CN 112390385 A CN112390385 A CN 112390385A CN 202011182664 A CN202011182664 A CN 202011182664A CN 112390385 A CN112390385 A CN 112390385A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 77
- 238000005260 corrosion Methods 0.000 title claims abstract description 77
- 239000003112 inhibitor Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 36
- -1 polyol phosphate Chemical class 0.000 claims abstract description 33
- 239000008367 deionised water Substances 0.000 claims abstract description 31
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 31
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 26
- 239000010452 phosphate Substances 0.000 claims abstract description 26
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 25
- LMHAGAHDHRQIMB-UHFFFAOYSA-N 1,2-dichloro-1,2,3,3,4,4-hexafluorocyclobutane Chemical compound FC1(F)C(F)(F)C(F)(Cl)C1(F)Cl LMHAGAHDHRQIMB-UHFFFAOYSA-N 0.000 claims abstract description 24
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 23
- 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 22
- 229920005862 polyol Polymers 0.000 claims abstract description 22
- 239000000176 sodium gluconate Substances 0.000 claims abstract description 22
- 235000012207 sodium gluconate Nutrition 0.000 claims abstract description 22
- 229940005574 sodium gluconate Drugs 0.000 claims abstract description 22
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims abstract description 22
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000012964 benzotriazole Substances 0.000 claims abstract description 21
- HPYNZHMRTTWQTB-UHFFFAOYSA-N dimethylpyridine Natural products CC1=CC=CN=C1C HPYNZHMRTTWQTB-UHFFFAOYSA-N 0.000 claims abstract description 21
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 18
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000008234 soft water Substances 0.000 claims abstract description 13
- 150000003751 zinc Chemical class 0.000 claims abstract description 10
- 150000001735 carboxylic acids Chemical class 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 27
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 24
- 239000011259 mixed solution Substances 0.000 claims description 18
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 16
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical group [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 16
- 229960001763 zinc sulfate Drugs 0.000 claims description 16
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 16
- 235000015393 sodium molybdate Nutrition 0.000 claims description 14
- 239000011684 sodium molybdate Substances 0.000 claims description 14
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical group [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 claims description 14
- 239000005711 Benzoic acid Substances 0.000 claims description 12
- 235000010233 benzoic acid Nutrition 0.000 claims description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 6
- BMOKHTQIBPRXSL-UHFFFAOYSA-N 2h-benzotriazole;sodium Chemical compound [Na].C1=CC=CC2=NNN=C21 BMOKHTQIBPRXSL-UHFFFAOYSA-N 0.000 claims description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 4
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 4
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 4
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 claims description 4
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 4
- 239000011976 maleic acid Substances 0.000 claims description 4
- 229910052700 potassium Inorganic materials 0.000 claims description 4
- 239000011591 potassium Substances 0.000 claims description 4
- 150000005846 sugar alcohols Polymers 0.000 claims description 4
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 4
- 239000005639 Lauric acid Substances 0.000 claims description 2
- 239000001361 adipic acid Substances 0.000 claims description 2
- 235000011037 adipic acid Nutrition 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 239000002455 scale inhibitor Substances 0.000 abstract description 3
- 231100000053 low toxicity Toxicity 0.000 abstract description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 14
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 14
- 150000003077 polyols Chemical class 0.000 description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 230000001681 protective effect Effects 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 7
- 150000002148 esters Chemical class 0.000 description 7
- 230000005764 inhibitory process Effects 0.000 description 6
- 239000011780 sodium chloride Substances 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000012467 final product Substances 0.000 description 5
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 description 5
- 229910000975 Carbon steel Inorganic materials 0.000 description 4
- 239000010962 carbon steel Substances 0.000 description 4
- 150000004010 onium ions Chemical class 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910015667 MoO4 Inorganic materials 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229940071161 dodecylbenzenesulfonate Drugs 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229940060296 dodecylbenzenesulfonic acid Drugs 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000001475 halogen functional group Chemical group 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/14—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
- C02F5/145—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus combined with inorganic substances
Abstract
The invention discloses a corrosion inhibitor and a preparation method and application thereof. The corrosion inhibitor comprises molybdate, ammonium chloride, zinc salt, polyol phosphate, benzotriazole, 2-hydroxyphosphonoacetic acid, organic carboxylic acid, sodium gluconate, sodium tungstate, sodium dodecyl benzene sulfonate, dimethyl pyridine quaternary ammonium salt and deionized water. During preparation, different components are dissolved separately, and then the obtained solution is mixed and stirred, so that the consumption of the components can be effectively avoided. The corrosion inhibitor is mainly used in a soft water closed circulating cooling system, can effectively relieve the corrosion of the soft water circulating system, and compared with the similar corrosion and scale inhibitor, the environment-friendly corrosion inhibitor suitable for the soft water closed circulating cooling system provided by the invention has the advantages of low toxicity, low cost, simple operation, convenience, rapidness, good environmental compatibility, safety, high efficiency and the like.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a corrosion inhibitor, and a preparation method and application thereof.
Background
With the increasing shortage of water resources, water conservation has become a worldwide problem. In recent years, with the wide application of advanced water treatment technologies and equipment such as reverse osmosis and the like, softened water or pure water is popularized as industrial circulating cooling water, and particularly, softened water is required to be used by some high-temperature devices to meet the requirements of industrial production on cooling and heat exchange. The hardness of the soft water circulating system is generally about 0-15 mg/L, and the closed soft water circulating system has the obvious characteristics of no scaling and extremely strong corrosivity, so that the key for solving the problems of metal corrosion, particularly the corrosion of carbon steel and copper equipment becomes the work of the soft water circulating system. Because of the restriction of the problems of cost, environmental protection and the like, common carbon steel corrosion inhibitors such as nitrite, chromate and silicate can not be adopted, so that the development of corrosion inhibitors with high cost performance and environmental friendliness is the key point of the development of the industry.
The corrosion inhibitors commonly used at present are of the phosphate series and the oxidative corrosion inhibitors. The phosphate series corrosion inhibitor has high phosphorus content and is easy to cause water eutrophication; the oxidizing corrosion inhibitor is generally harmful to human bodies and the environment, the dosage is large, and the application range is limited. According to the green chemical principle and the view point, the research and development of the novel soft water corrosion inhibitor with low phosphorus content, good environmental compatibility and low production cost are carried out around the three aspects of performance, environment and economy.
Disclosure of Invention
Aiming at the prior art, the invention provides a corrosion inhibitor, a preparation method and application thereof, aiming at solving the problems of poor corrosion inhibition performance and easy environmental pollution of the existing corrosion inhibitor.
In order to achieve the purpose, the invention adopts the technical scheme that: the corrosion inhibitor comprises the following components in parts by mass:
3-6 parts of molybdate, 2-4 parts of ammonium chloride, 1-3 parts of zinc salt, 0.5-1.5 parts of polyol phosphate, 0.5-1.5 parts of benzotriazole, 0.5-1.5 parts of 2-hydroxyphosphonoacetic acid, 2-4 parts of organic carboxylic acid, 1-3 parts of sodium gluconate, 0.5-1.5 parts of sodium tungstate, 0.5-1.5 parts of sodium dodecyl benzene sulfonate, 0.5-1.5 parts of dimethyl pyridine quaternary ammonium salt and 65-430 parts of deionized water.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the corrosion inhibitor comprises the following components in parts by mass:
5 parts of molybdate, 3 parts of ammonium chloride, 2 parts of zinc salt, 1 part of polyhydric alcohol phosphate, 1 part of benzotriazole, 1 part of 2-hydroxyphosphonoacetic acid, 3 parts of organic carboxylic acid, 2 parts of sodium gluconate, 1 part of sodium tungstate, 1 part of sodium dodecyl benzene sulfonate, 1 part of dimethyl pyridine quaternary ammonium salt and 200 parts of deionized water.
The corrosion inhibitor of the invention is composed of a plurality of functional components. Wherein the ammonium chloride is weakly acidic after being dissolved in deionized water, and dodecyl benzene sulfonate anion and H+The formed dodecyl benzene sulfonic acid onium ions are adsorbed to the surface of the protective medium through electrostatic interaction; molybdate is MoO in the system4 2-Is present in the same MoO form4 2-The sodium dodecyl benzene sulfonate is absorbed on an ionic membrane of the sodium dodecyl benzene sulfonate by electrostatic lease and covers the surface of a protective medium; due to MoO4 2-Presence of, MoO4 2-And Cl-Competitive adsorption occurs at metal surface defects, weakening Cl-The adsorption enhances the pitting corrosion resistance of the adsorption film, the adsorption film is relatively perfect, and the corrosion is delayed. The polyol phosphate in the corrosion inhibitor can effectively prevent the generation of scale, prevent the scale from accumulating on the surface of a protective medium and reduce the pitting probability. The sodium gluconate can form a protective film on the metal surface of the circulating cooling water pipeline, so that the slow release effect is improved. The organic acid is weak in acidity and does not corrode metal, and can provide H+The metal surface protective agent can be combined with dodecyl benzene sulfonate anions to form a large amount of onium ions, and has stronger protective capability on the metal surface of a circulating cooling water pipeline. The dimethyl pyridine quaternary ammonium salt is strongly adsorbed on the metal surface by a plurality of polar groups and generates a complex reaction to form a compact multi-molecular complex adsorption film, and the corrosion medium and the metal surface are separated by controlling the anode process to a certain extent through the inhibition of the cathode process, so that the metal is protected. The 2-hydroxyphosphonoacetic acid has good scale inhibition and slow release performance, and can effectively prevent the accumulation of scale by being compounded with zinc salt. Sodium tungstate can form a layer on the surface of the substrateThe tungstate film prevents corrosive media from entering a matrix to prevent the matrix from being corroded, but the compactness of the tungstate film is not good, and active groups of sodium dodecyl benzene sulfonate in the corrosion inhibitor have strong adsorption effect and can be adsorbed on the surface of the tungstate film, so that pores existing in the tungstate film are filled, corrosive media are more difficult to enter, and the corrosion inhibition effect is better.
Further, the molybdate is sodium molybdate and/or potassium molybdate.
Further, the zinc salt is zinc sulfate.
Further, the polyol phosphate ester is a B-type nitrogen-containing polyol phosphate ester.
Further, the solid content of 2-hydroxyphosphonoacetic acid was 50%.
Further, the organic carboxylic acid is at least one of benzoic acid, citric acid, maleic acid, lauric acid and adipic acid.
The corrosion inhibitor is prepared by the following steps:
s1: dissolving polyalcohol phosphate, 2-hydroxyphosphonoacetic acid, zinc salt, molybdate and ammonium chloride in half amount of deionized water to obtain a solution A;
s2: dissolving organic carboxylic acid, sodium gluconate and dimethyl pyridine quaternary ammonium salt in the other half amount of deionized water to obtain a solution B;
s3: adding the solution B into the solution A under the stirring condition, and continuously stirring for 15-25 min to obtain a mixed solution;
s4: and adding benzotriazole, sodium tungstate and sodium dodecyl benzene sulfonate into the mixed solution, and continuously stirring for 10-15 min to obtain the benzotriazole-sodium tungstate-sodium dodecyl benzene sulfonate.
The corrosion inhibitor can effectively relieve the corrosion of metal, and is particularly suitable for the corrosion prevention of a soft water circulating system. When the soft water circulating system is subjected to corrosion prevention, the addition amount of the corrosion inhibitor is 300-500 mg/L.
The invention has the beneficial effects that: the environment-friendly corrosion inhibitor applicable to the soft water closed circulating cooling system provided by the invention has the advantages that the phosphorus content in the added circulating water is less than or equal to 0.5mg/L, and the new environment-friendly requirement is met. Compared with the similar corrosion and scale inhibitor, the environment-friendly corrosion inhibitor suitable for the soft water closed circulating cooling system provided by the invention has the advantages of low toxicity, low cost, simplicity in operation, convenience, rapidness, good environmental compatibility, safety, high efficiency and the like.
Detailed Description
The following examples are provided to illustrate specific embodiments of the present invention.
Example 1
The corrosion inhibitor comprises the following components in parts by mass:
5 parts of sodium molybdate, 3 parts of ammonium chloride, 2 parts of zinc sulfate, 1 part of B-type nitrogen-containing polyol phosphate (phosphoric acid mixed ester of polyhydroxy compound), 1 part of benzotriazole, 1 part of 2-hydroxyphosphonoacetic acid with solid content of 50%, 3 parts of benzoic acid, 2 parts of sodium gluconate, 1 part of sodium tungstate, 1 part of sodium dodecyl benzene sulfonate, 1 part of dimethyl pyridine quaternary ammonium salt and 200 parts of deionized water.
The corrosion inhibitor in the embodiment is prepared by the following steps:
s1: dissolving B-type nitrogen-containing polyol phosphate, 2-hydroxyphosphonoacetic acid with the solid content of 50%, zinc sulfate, sodium molybdate and ammonium chloride into half of deionized water to obtain a solution A;
s2: dissolving benzoic acid, sodium gluconate and dimethyl pyridine quaternary ammonium salt in the other half amount of deionized water to obtain a solution B;
s3: adding the solution B into the solution A under the stirring condition, and continuously stirring for 20min to obtain a mixed solution;
s4: adding benzotriazole, sodium tungstate and sodium dodecyl benzene sulfonate into the mixed solution, and continuously stirring for 10min to obtain the final product.
Example 2
The corrosion inhibitor comprises the following components in parts by mass:
3 parts of potassium molybdate, 4 parts of ammonium chloride, 1 part of zinc sulfate, 1.5 parts of B-type nitrogen-containing polyol phosphate (phosphoric acid mixed ester of polyhydroxy compound), 0.5 part of benzotriazole, 1.5 parts of 2-hydroxyphosphonoacetic acid with solid content of 50%, 2 parts of citric acid, 3 parts of sodium gluconate, 0.5 part of sodium tungstate, 1.5 parts of sodium dodecyl benzene sulfonate, 0.5 part of dimethyl pyridine quaternary ammonium salt and 150 parts of deionized water.
The corrosion inhibitor in the embodiment is prepared by the following steps:
s1: dissolving B-type nitrogen-containing polyol phosphate, 2-hydroxyphosphonoacetic acid with the solid content of 50%, zinc sulfate, potassium molybdate and ammonium chloride into half of deionized water to obtain a solution A;
s2: dissolving citric acid, sodium gluconate and dimethyl pyridine quaternary ammonium salt in the other half amount of deionized water to obtain a solution B;
s3: adding the solution B into the solution A under the stirring condition, and continuously stirring for 15min to obtain a mixed solution;
s4: and adding benzotriazole, sodium tungstate and sodium dodecyl benzene sulfonate into the mixed solution, and continuously stirring for 15min to obtain the benzotriazole-sodium tungstate-sodium dodecyl benzene sulfonate-sodium benzoate-sodium.
Example 3
The corrosion inhibitor comprises the following components in parts by mass:
6 parts of sodium molybdate, 2 parts of ammonium chloride, 3 parts of zinc sulfate, 0.5 part of B-type nitrogen-containing polyol phosphate (phosphoric acid mixed ester of polyhydroxy compound), 1.5 parts of benzotriazole, 0.5 part of 2-hydroxyphosphonoacetic acid with the solid content of 50%, 4 parts of maleic acid, 1 part of sodium gluconate, 1.5 parts of sodium tungstate, 0.5 part of sodium dodecyl benzene sulfonate, 1.5 parts of dimethyl pyridine quaternary ammonium salt and 430 parts of deionized water.
The corrosion inhibitor in the embodiment is prepared by the following steps:
s1: dissolving B-type nitrogen-containing polyol phosphate, 2-hydroxyphosphonoacetic acid with the solid content of 50%, zinc sulfate, sodium molybdate and ammonium chloride into half of deionized water to obtain a solution A;
s2: dissolving maleic acid, sodium gluconate and dimethyl pyridine quaternary ammonium salt in the other half amount of deionized water to obtain a solution B;
s3: adding the solution B into the solution A under the stirring condition, and continuously stirring for 25min to obtain a mixed solution;
s4: adding benzotriazole, sodium tungstate and sodium dodecyl benzene sulfonate into the mixed solution, and continuously stirring for 10min to obtain the final product.
Comparative example 1
The corrosion inhibitor comprises the following components in parts by mass:
5 parts of sodium molybdate, 3 parts of sodium chloride, 2 parts of zinc sulfate, 1 part of B-type nitrogen-containing polyol phosphate (phosphoric acid mixed ester of polyhydroxy compound), 1 part of benzotriazole, 1 part of 2-hydroxyphosphonoacetic acid with solid content of 50%, 3 parts of benzoic acid, 2 parts of sodium gluconate, 1 part of sodium tungstate, 1 part of sodium dodecyl benzene sulfonate, 1 part of dimethyl pyridine quaternary ammonium salt and 200 parts of deionized water.
The corrosion inhibitor in the embodiment is prepared by the following steps:
s1: dissolving B-type nitrogen-containing polyol phosphate, 2-hydroxyphosphonoacetic acid with the solid content of 50%, zinc sulfate, sodium molybdate and sodium chloride into half of deionized water to obtain a solution A;
s2: dissolving benzoic acid, sodium gluconate and dimethyl pyridine quaternary ammonium salt in the other half amount of deionized water to obtain a solution B;
s3: adding the solution B into the solution A under the stirring condition, and continuously stirring for 20min to obtain a mixed solution;
s4: adding benzotriazole, sodium tungstate and sodium dodecyl benzene sulfonate into the mixed solution, and continuously stirring for 10min to obtain the final product.
Comparative example 2
The corrosion inhibitor comprises the following components in parts by mass:
5 parts of sodium molybdate, 3 parts of ammonium chloride, 2 parts of zinc sulfate, 1 part of B-type nitrogen-containing polyol phosphate (phosphoric acid mixed ester of polyhydroxy compound), 1 part of benzotriazole, 1 part of 2-hydroxyphosphonoacetic acid with solid content of 50%, 3 parts of benzoic acid, 2 parts of sodium gluconate, 1 part of sodium tungstate, 1 part of dimethyl pyridine quaternary ammonium salt and 200 parts of deionized water.
The corrosion inhibitor in the embodiment is prepared by the following steps:
s1: dissolving B-type nitrogen-containing polyol phosphate, 2-hydroxyphosphonoacetic acid with the solid content of 50%, zinc sulfate, sodium molybdate and sodium chloride into half of deionized water to obtain a solution A;
s2: dissolving benzoic acid, sodium gluconate and dimethyl pyridine quaternary ammonium salt in the other half amount of deionized water to obtain a solution B;
s3: adding the solution B into the solution A under the stirring condition, and continuously stirring for 20min to obtain a mixed solution;
s4: and adding benzotriazole and sodium tungstate into the mixed solution, and continuously stirring for 10min to obtain the benzotriazole-sodium tungstate composite material.
Comparative example 3
The corrosion inhibitor comprises the following components in parts by mass:
5 parts of sodium molybdate, 2 parts of zinc sulfate, 1 part of B-type nitrogen-containing polyol phosphate (phosphoric acid mixed ester of polyhydroxy compound), 1 part of benzotriazole, 1 part of 2-hydroxyphosphonoacetic acid with solid content of 50%, 3 parts of benzoic acid, 2 parts of sodium gluconate, 1 part of sodium tungstate, 1 part of sodium dodecyl benzene sulfonate, 1 part of dimethyl pyridine quaternary ammonium salt and 200 parts of deionized water.
The corrosion inhibitor in the embodiment is prepared by the following steps:
s1: dissolving B-type nitrogenous polyol phosphate, 2-hydroxyphosphonoacetic acid with the solid content of 50%, zinc sulfate and sodium molybdate into half of deionized water to obtain a solution A;
s2: dissolving benzoic acid, sodium gluconate and dimethyl pyridine quaternary ammonium salt in the other half amount of deionized water to obtain a solution B;
s3: adding the solution B into the solution A under the stirring condition, and continuously stirring for 20min to obtain a mixed solution;
s4: adding benzotriazole, sodium tungstate and sodium dodecyl benzene sulfonate into the mixed solution, and continuously stirring for 10min to obtain the final product.
Comparative example 4
The corrosion inhibitor comprises the following components in parts by mass:
5 parts of sodium molybdate, 3 parts of ammonium chloride, 2 parts of zinc sulfate, 1 part of B-type nitrogen-containing polyol phosphate (phosphoric acid mixed ester of polyhydroxy compound), 1 part of benzotriazole, 1 part of 2-hydroxyphosphonoacetic acid with solid content of 50%, 3 parts of benzoic acid, 2 parts of sodium gluconate, 1 part of sodium tungstate, 1 part of sodium dodecyl benzene sulfonate and 200 parts of deionized water.
The corrosion inhibitor in the embodiment is prepared by the following steps:
s1: dissolving B-type nitrogen-containing polyol phosphate, 2-hydroxyphosphonoacetic acid with the solid content of 50%, zinc sulfate, sodium molybdate and sodium chloride into half of deionized water to obtain a solution A;
s2: dissolving benzoic acid and sodium gluconate in the other half amount of deionized water to obtain a solution B;
s3: adding the solution B into the solution A under the stirring condition, and continuously stirring for 20min to obtain a mixed solution;
s4: adding benzotriazole, sodium tungstate and sodium dodecyl benzene sulfonate into the mixed solution, and continuously stirring for 10min to obtain the final product.
Analysis of results
Experimental samples: the corrosion inhibitor is prepared by the experimental groups.
A cooling water dynamic simulation test method HG/T2160-2008 is adopted. The test apparatus was manufactured by Motian electronics Co., Ltd, Gaoyou, Jiangsu, the experimental process conditions are shown in Table 1, the experimental water quality index is shown in Table 2, the chemical dosing concentration is 350ppm, and the water replenishment and the chemical dosing are continuously performed.
Table 1 experimental process conditions
Table 2 experimental water quality index (2020 year 7 month field water)
| Test items | Water supplement | Quality of experiment water |
| Total hardness (as CaCO)3Calculated), mg/L | 15.56 | 45.56 |
| Full alkalinity (as CaCO)3Calculated), mg/L | 24.25 | 75.35 |
| Chloride, mg/L | 12.65 | 25.38 |
| pH | 8.23 | 8.35 |
| Conductance,. mu.s/cm | 9.86 | 165 |
The results of the in situ corrosion tests under these water conditions are shown in table 3.
TABLE 3 Corrosion test results
Note: the "experimental water quality factor" in Table 3 represents the concentration factor.
As can be seen from the above table, the corrosion rates of the experimental carbon steel for determining the dynamic corrosion performance of the corrosion inhibitor prepared in the embodiments 1-3 of the invention are all less than 0.065 mm/a; the corrosion rate reaches the requirements of national design Specification for treating industrial circulating cooling water (GB 50050-2017). Meanwhile, the occurrence of the colorful halo on the surface of the carbon steel indicates that a protective film is generated on the surface of the metal. The phosphorus-free corrosion and scale inhibitor prepared in the embodiment 3 has the best corrosion inhibition effect.
Comparative example 1 compared with example 1, ammonium chloride in the composition is replaced by sodium chloride, and sodium chloride is not hydrolyzed after being dissolved in tax, so that sufficient H is not generated+The amount of the formed onium ions is limited, and effective protection of the steel cannot be achieved, so that the corrosion resistance of the steel is poor.
Compared with the example 1, the component of the comparative example 2 lacks sodium dodecyl benzene sulfonate, so that not only can no onium ions be formed, but also a film formed by tungstate in the component can not be effectively repaired, namely, the corrosion inhibitor can not form a protective film with excellent performance on the surface of steel, and the corrosion resistance of the final steel is poorer.
Comparative example 3 compared to example 1, the lack of ammonium chloride in the composition, like comparative example 1, does not produce enough H when the corrosion inhibitor is dissolved in water+The amount of the formed onium ions is limited, and effective protection of the steel cannot be achieved, so that the corrosion resistance of the steel is poor.
Compared with the example 1, the component of the comparative example 4 lacks dimethyl pyridine quaternary ammonium salt, so that the corrosion inhibitor can not form an effective protective film on the surface of steel, the inhibition effect on the cathode process is also disappeared, and the corrosion resistance of the steel is poor.
While the present invention has been described in detail with reference to the embodiments, it should not be construed as limited to the scope of the patent. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (10)
1. The corrosion inhibitor is characterized by comprising the following components in parts by mass:
3-6 parts of molybdate, 2-4 parts of ammonium chloride, 1-3 parts of zinc salt, 0.5-1.5 parts of polyol phosphate, 0.5-1.5 parts of benzotriazole, 0.5-1.5 parts of 2-hydroxyphosphonoacetic acid, 2-4 parts of organic carboxylic acid, 1-3 parts of sodium gluconate, 0.5-1.5 parts of sodium tungstate, 0.5-1.5 parts of sodium dodecyl benzene sulfonate, 0.5-1.5 parts of dimethyl pyridine quaternary ammonium salt and 65-430 parts of deionized water.
2. The corrosion inhibitor according to claim 1, characterized by comprising the following components in parts by mass:
5 parts of molybdate, 3 parts of ammonium chloride, 2 parts of zinc salt, 1 part of polyhydric alcohol phosphate, 1 part of benzotriazole, 1 part of 2-hydroxyphosphonoacetic acid, 3 parts of organic carboxylic acid, 2 parts of sodium gluconate, 1 part of sodium tungstate, 1 part of sodium dodecyl benzene sulfonate, 1 part of dimethyl pyridine quaternary ammonium salt and 200 parts of deionized water.
3. The corrosion inhibitor according to claim 1 or 2, characterized in that: the molybdate is sodium molybdate and/or potassium molybdate.
4. The corrosion inhibitor according to claim 1 or 2, characterized in that: the zinc salt is zinc sulfate.
5. The corrosion inhibitor according to claim 1 or 2, characterized in that: the polyol phosphate ester is B-type nitrogen-containing polyol phosphate ester.
6. The corrosion inhibitor according to claim 1 or 2, characterized in that: the 2-hydroxyphosphonoacetic acid has a solids content of 50%.
7. The corrosion inhibitor according to claim 1 or 2, characterized in that: the organic carboxylic acid is at least one of benzoic acid, citric acid, maleic acid, lauric acid and adipic acid.
8. The method for preparing the corrosion inhibitor according to any one of claims 1 to 7, comprising the steps of:
s1: dissolving polyalcohol phosphate, 2-hydroxyphosphonoacetic acid, zinc salt, molybdate and ammonium chloride in half amount of deionized water to obtain a solution A;
s2: dissolving organic carboxylic acid, sodium gluconate and dimethyl pyridine quaternary ammonium salt in the other half amount of deionized water to obtain a solution B;
s3: adding the solution B into the solution A under the stirring condition, and continuously stirring for 15-25 min to obtain a mixed solution;
s4: and adding benzotriazole, sodium tungstate and sodium dodecyl benzene sulfonate into the mixed solution, and continuously stirring for 10-15 min to obtain the benzotriazole-sodium tungstate-sodium dodecyl benzene sulfonate.
9. Use of the corrosion inhibitor according to any one of claims 1 to 7 in a soft water closed circulation cooling system.
10. Use according to claim 9, characterized in that: when the soft water closed circulation cooling system normally operates, the adding amount of the corrosion inhibitor is 300-500 mg/L.
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