CN113005461A - Carbon steel descaling and cleaning corrosion inhibitor and cleaning agent - Google Patents
Carbon steel descaling and cleaning corrosion inhibitor and cleaning agent Download PDFInfo
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- CN113005461A CN113005461A CN201911327468.0A CN201911327468A CN113005461A CN 113005461 A CN113005461 A CN 113005461A CN 201911327468 A CN201911327468 A CN 201911327468A CN 113005461 A CN113005461 A CN 113005461A
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- 238000005260 corrosion Methods 0.000 title claims abstract description 169
- 239000003112 inhibitor Substances 0.000 title claims abstract description 108
- 238000004140 cleaning Methods 0.000 title claims abstract description 34
- 229910000975 Carbon steel Inorganic materials 0.000 title claims abstract description 19
- 239000010962 carbon steel Substances 0.000 title claims abstract description 19
- 239000012459 cleaning agent Substances 0.000 title claims description 26
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 37
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229960002233 benzalkonium bromide Drugs 0.000 claims abstract description 18
- KHSLHYAUZSPBIU-UHFFFAOYSA-M benzododecinium bromide Chemical compound [Br-].CCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 KHSLHYAUZSPBIU-UHFFFAOYSA-M 0.000 claims abstract description 18
- 150000001875 compounds Chemical class 0.000 claims abstract description 12
- 238000005554 pickling Methods 0.000 claims description 33
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 16
- 238000009472 formulation Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 7
- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 claims description 6
- 241000680714 Rhodine Species 0.000 claims description 6
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims description 5
- GHXZTYHSJHQHIJ-UHFFFAOYSA-N Chlorhexidine Chemical compound C=1C=C(Cl)C=CC=1NC(N)=NC(N)=NCCCCCCN=C(N)N=C(N)NC1=CC=C(Cl)C=C1 GHXZTYHSJHQHIJ-UHFFFAOYSA-N 0.000 claims description 3
- 229960003260 chlorhexidine Drugs 0.000 claims description 3
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- 238000002791 soaking Methods 0.000 claims description 2
- 230000005764 inhibitory process Effects 0.000 abstract description 48
- 230000000694 effects Effects 0.000 abstract description 14
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- 238000002360 preparation method Methods 0.000 abstract description 3
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- 238000001514 detection method Methods 0.000 description 12
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- 230000000052 comparative effect Effects 0.000 description 7
- 239000012153 distilled water Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- IIACRCGMVDHOTQ-UHFFFAOYSA-N sulfamic acid Chemical compound NS(O)(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-N 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 150000002148 esters Chemical class 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
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- 229940079593 drug Drugs 0.000 description 2
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- 150000004676 glycans Chemical class 0.000 description 2
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- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000001263 FEMA 3042 Substances 0.000 description 1
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 description 1
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- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- DDAQLPYLBPPPRV-UHFFFAOYSA-N [4-(hydroxymethyl)-2-oxo-1,3,2lambda5-dioxaphosphetan-2-yl] dihydrogen phosphate Chemical compound OCC1OP(=O)(OP(O)(O)=O)O1 DDAQLPYLBPPPRV-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
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- 239000010949 copper Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 238000009776 industrial production Methods 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229960002895 phenylbutazone Drugs 0.000 description 1
- VYMDGNCVAMGZFE-UHFFFAOYSA-N phenylbutazonum Chemical compound O=C1C(CCCC)C(=O)N(C=2C=CC=CC=2)N1C1=CC=CC=C1 VYMDGNCVAMGZFE-UHFFFAOYSA-N 0.000 description 1
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- 235000002949 phytic acid Nutrition 0.000 description 1
- 239000000467 phytic acid Substances 0.000 description 1
- -1 quaternary ammonium salt compound Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 229920002258 tannic acid Polymers 0.000 description 1
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 description 1
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- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/065—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors sulfur-containing compounds
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Detergent Compositions (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention provides a carbon steel descaling and cleaning corrosion inhibitor which comprises any two of the following compounds: sodium dodecyl benzene sulfonate, urotropine, tolidine or benzalkonium bromide. Wherein the mass ratio of any two compounds is 1-3: 3-1. The corrosion inhibitor has the advantages of good corrosion inhibition effect, simple formula, simple preparation process and easy operation, and can be prepared and used on site. In addition, the corrosion inhibitor has good stability and can also be dissolved in water to form solution for transportation.
Description
Technical Field
The invention relates to the technical field of fine chemical engineering, in particular to a carbon steel descaling and cleaning corrosion inhibitor and a cleaning agent.
Background
In industrial production, the heat exchanger and the pipeline system can be increased along with the service life, and the water quality component changes and the like, so that the problems of heat exchange efficiency reduction and pipeline resistance increase occur. For this purpose, cleaning and descaling, heat exchange efficiency recovery and pipeline dredging are required. In general, the piping system and the heat exchanger are made of carbon steel, stainless steel, aluminum, copper, or the like. However, carbon steel is easy to corrode in the cleaning process, so that in order to ensure that the carbon steel material is not corroded in the descaling and cleaning process, a corrosion inhibitor needs to be added into the cleaning solution for protection.
The corrosion inhibitor used at present is generally a mixture of a plurality of substances, and has more varieties, larger addition amount and higher price of individual components. Chinese patent document CN104988519A (application No. 201510456723.7) discloses a pickling inhibitor and a pickling method using the same, wherein the pickling inhibitor comprises quaternary ammonium salt compound, thiourea, hydroxyethylidene diphosphate and/or its salt, and phytic acid and/or tannic acid. The corrosion inhibitor has low consumption and excellent corrosion inhibition performance, but the corrosion inhibitor has more compounds in the formula, thereby increasing the difficulty of wastewater treatment.
There are also reports related to corrosion inhibitors with relatively simple formulations, and the high-efficiency corrosion inhibitor provided by chinese patent document CN105154885A (application No. 201510578279.6) is sulfated polysaccharide Fucoidan, which is applied to zinc and its metal products as an anticorrosion corrosion inhibitor. The method has the advantages of small dosage, high efficiency, long lasting action time, capability of effectively inhibiting the corrosion damage of the metal zinc and the like, but the sulfated polysaccharide Fucoidan is expensive and has poor economic efficiency for the industry requiring a large amount of cleaning agents.
Disclosure of Invention
The invention aims to find a corrosion inhibitor formula and a cleaning agent for carbon steel descaling, which are efficient, simpler and lower in price.
In order to realize the purpose, the invention provides a carbon steel descaling and cleaning corrosion inhibitor, which specifically adopts the following technical scheme.
A carbon steel descaling and cleaning corrosion inhibitor comprises any two of the following compounds: sodium dodecyl benzene sulfonate, urotropine, tolidine or benzalkonium bromide.
Preferably, the mass ratio of any two compounds is 1-3: 3-1.
Preferably, the corrosion inhibitor formulation is selected from one of the following combinations:
1) sodium dodecylbenzene sulfonate and rhodine; the mass ratio of the sodium dodecyl benzene sulfonate to the corydalis is 1-3: 3-1;
2) sodium dodecyl benzene sulfonate and urotropine, wherein the mass ratio of the sodium dodecyl benzene sulfonate to the urotropine is 1-3: 3-1;
3) the mass ratio of the urotropin to the formotin is 1-3: 3-1.
Further preferably, the mass ratio of the sodium dodecyl benzene sulfonate to the nitrendine is 1: 2-3, the mass ratio of the sodium dodecyl benzene sulfonate to the urotropine is 1: 2-3, and the mass ratio of the urotropine to the nitrendine is 1: 2-3.
Preferably, the corrosion inhibitor formula comprises sodium dodecyl benzene sulfonate and dibutyl ester, wherein the mass ratio of the sodium dodecyl benzene sulfonate to the dibutyl ester is 1: 2-3.
The invention also provides a cleaning agent containing the corrosion inhibitor, which comprises 0.1-0.3% of the corrosion inhibitor by mass and 3% -10% of sulfamic acid by mass.
Preferably, the content of the corrosion inhibitor in the cleaning agent is 0.2%.
The invention also provides a using method of the cleaning agent, which comprises the following steps:
adding the two compounds in the formula into a pickling solution containing sulfamic acid to obtain a cleaning agent containing the corrosion inhibitor; wherein the mass percent of the corrosion inhibitor in the cleaning agent is 0.1-0.3%, and the mass percent of the sulfamic acid is 3% -10%; the pickling environment temperature is 5-40 ℃; the pickling time is 0.5-5 hours.
Preferably, the acid washing mode is as follows: soaking and pickling, or performing circulating pickling by using a pickling circulating pump.
Compared with the prior art, the main advantages of the pickling corrosion inhibitor are as follows:
the corrosion inhibitor has the advantages of good corrosion inhibition effect, simple formula, simple preparation process and easy operation, and can be prepared and used on site. The price of the compound in the formula is low, the price is 2 yuan to 20 yuan per kilogram, the dosage of the formula is low, and the price has obvious advantages. The adding amount of the corrosion inhibitor product (the content of the corrosion inhibitor in the cleaning agent) in the general market is between 0.3 and 1 percent by mass, and the unit dosage cost is 40 to 100 yuan for adding the corrosion inhibitor into each ton of the cleaning agent. The dosage of the corrosion inhibitor product is 0.1-0.3%, and the unit dosage cost of the corrosion inhibitor formula is 5-15 yuan per ton of the cost of adding the corrosion inhibitor to each ton of cleaning agent, so that the corrosion inhibitor has obvious economic advantages. In addition, the corrosion inhibitor has good stability, can be prepared by dissolving solid on site, and can also be dissolved in water to form solution for transportation.
Drawings
FIG. 1 is a graph of the corrosion inhibition efficiency of different component combinations (component ratio 1:1) in a 3% sulfamic acid cleaning solution;
FIG. 2 is a graph of the corrosion inhibition efficiency of different component combinations (component ratio 1:2) in a 6% sulfamic acid cleaning solution;
FIG. 3 is a graph of the corrosion inhibition efficiency of different component combinations (component ratio 1:3) in a 10% sulfamic acid cleaning solution;
FIG. 4 is a graph of the corrosion inhibition efficiency of various component combinations (component ratio 3:1) in a 5% sulfamic acid cleaning solution.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The invention is compounded by optionally selecting two of the following compounds: sodium dodecylbenzene sulfonate, urotropin, tolidine or benzalkonium bromide; the formula of the obtained corrosion inhibitor is as follows: respectively comprising a formula I, a formula II, a formula III, a formula IV, a formula V and a formula VI.
The formula I is as follows: the mass ratio of the sodium dodecyl benzene sulfonate to the dibutyl ester is 1-3: 3-1.
And a formula II: the composition comprises sodium dodecyl benzene sulfonate and urotropine, wherein the mass ratio of the sodium dodecyl benzene sulfonate to the urotropine is 1-3: 3-1.
And a formula III: the composition comprises sodium dodecyl benzene sulfonate and benzalkonium bromide, wherein the mass ratio of the sodium dodecyl benzene sulfonate to the benzalkonium bromide is 1-3: 3-1.
And a formula IV: the mass ratio of the urotropin to the formotin is 1-3: 3-1.
Formula V: the drug composition comprises urotropine and benzalkonium bromide, wherein the mass ratio of the urotropine to the benzalkonium bromide is 1-3: 3-1.
And a formula VI: the mass ratio of the phenylbutazone to the benzalkonium bromide is 1-3: 3-1.
The preparation and use of the above formulations are described in detail below.
Example 1 formulation I
(1) Sodium dodecylbenzenesulfonate and a solid tetrabutyl titanate were weighed, respectively dissolved in distilled water, and each was prepared as an aqueous solution having a concentration of 5%.
(2) Adding the two aqueous solutions into a pickling solution containing 3%, 6%, 10% and 5% of aminosulfonic acid according to the mass ratio of 1:1, 1:2, 1:3 and 3:1 respectively to finally form the cleaning agent containing 0.1%, 0.3%, 0.2% and 0.2% of corrosion inhibitor.
(3) The corrosion inhibition efficiency of the corrosion inhibitor is respectively 88.2%, 99.2%, 99.1% and 90.5% by corrosion coupon test detection. Refer to standard TSG G5003-2008 boiler chemical cleaning rules.
TABLE 1 Corrosion inhibition effect test results for corrosion inhibitors of formula I
In the invention, the dosage of the corrosion inhibitor is the mass percentage of solute in the corrosion inhibitor in the total mass of the cleaning agent.
Example 2 formulation II
(1) Weighing sodium dodecyl benzene sulfonate and urotropine corrosion inhibitor solids, respectively dissolving in distilled water, and respectively preparing into aqueous solutions with the concentration of 5%;
(2) adding the two aqueous solutions into a pickling solution containing 3%, 6% and 10% of aminosulfonic acid according to the mass ratio of 1:1, 1:2, 1:3 and 3:1 respectively to finally form the cleaning agent containing 0.1%, 0.3%, 0.2% and 0.2% of corrosion inhibitor respectively.
(3) The corrosion inhibition efficiency of the corrosion inhibitor is respectively 77.6%, 85.1%, 83.3% and 84.6% through corrosion coupon test detection.
TABLE 2 Corrosion inhibition effect test results of corrosion inhibitor of formula II
Example 3 formulation III
(1) Weighing sodium dodecyl benzene sulfonate and benzalkonium bromide corrosion inhibitor solids, respectively dissolving in distilled water, and respectively preparing into water solutions with the concentration of 5%
(2) Adding the two aqueous solutions into a pickling solution containing 3%, 6%, 10% and 5% of aminosulfonic acid according to the mass ratio of 1:1, 1:2, 1:3 and 3:1 respectively to finally form the cleaning agent containing 0.1%, 0.3%, 0.2% and 0.2% of corrosion inhibitor.
(3) The corrosion inhibition efficiency of the corrosion inhibitor is 80.0%, 92.6% and 87.5% through corrosion coupon test detection.
TABLE 3 Corrosion inhibition effect test results for corrosion inhibitor of formula III
Example 4 formulation IV
(1) Urotropin and the solid phase of the rhodine corrosion inhibitor are respectively weighed and dissolved in distilled water to be respectively prepared into aqueous solution with the concentration of 5 percent.
(2) Respectively mixing the two aqueous solutions according to the mass ratio of 1:1, 1:2, 1:3 and 3:1 is added into pickling solution containing 3 percent, 6 percent, 10 percent and 5 percent of sulfamic acid to finally form the cleaning agent containing 0.1 percent, 0.3 percent, 0.2 percent and 0.2 percent of corrosion inhibitor.
(3) The corrosion inhibition efficiency of the corrosion inhibitor is found to be 81.5%, 94.0%, 93.7% and 86.7% respectively through corrosion coupon test detection.
TABLE 4 Corrosion inhibition effect test results of formula IV corrosion inhibitor
Example 5 formulation V
(1) Urotropine and benzalkonium bromide corrosion inhibitor solid are weighed and respectively dissolved in distilled water to prepare water solutions with the concentration of 5 percent.
(2) Adding the two aqueous solutions into a pickling solution containing 3%, 6%, 10% and 5% of aminosulfonic acid according to the mass ratio of 1:1, 1:2, 1:3 and 3:1 respectively to finally form the cleaning agent containing 0.1%, 0.3%, 0.2% and 0.2% of corrosion inhibitor.
(3) The corrosion inhibition efficiency of the corrosion inhibitor is 69.7%, 80%, 81.0% and 74.8% through corrosion coupon test detection.
TABLE 5 Corrosion inhibition Effect test results for formulation V Corrosion inhibitors
Example 6 formulation VI
(1) Weighing tolidine and benzalkonium bromide corrosion inhibitor solid, respectively dissolving in distilled water, and preparing into water solutions with the concentration of 5%.
(2) Adding the two aqueous solutions into a pickling solution containing 3%, 6%, 10% and 5% of aminosulfonic acid according to the mass ratio of 1:1, 1:2, 1:3 and 3:1 respectively to finally form the cleaning agent containing 0.1%, 0.3%, 0.2% and 0.2% of corrosion inhibitor.
(3) The corrosion inhibition efficiency of the corrosion inhibitor is 74.4%, 89.2%, 85.3% and 83.0% through corrosion coupon test detection.
TABLE 6 Corrosion inhibition effect test results for corrosion inhibitor of formula VI
The above examples show that the corrosion inhibition efficiency of examples 1 to 6 is better, wherein the highest corrosion inhibition efficiency of examples 1, 3 and 4 can reach more than 90%, and particularly the best effect of example 1 can reach 99.2%. The formula can realize the carbon steel cleaning corrosion inhibition effect with low cost, high efficiency and high reliability.
The corrosion inhibition effect of corrosion inhibitors with different formulas in pickling solutions with different concentrations is analyzed below. FIG. 1 shows the corrosion inhibition efficiency of different component combinations (component ratio 1:1) in a 3% sulfamic acid cleaning solution. As can be seen from FIG. 1, in a 3% sulfamic acid cleaning solution, the corrosion inhibition efficiency of each combination of corrosion inhibitors is between 69.7% and 88.2%, wherein the corrosion inhibition efficiency of the corrosion inhibitor (total concentration is 0.1%) formed by combining sodium dodecyl benzene sulfonate and chlorhexidine is the highest and reaches 88.2%. The corrosion inhibitor (total concentration is 0.1%) formed by the combination of urotropine and benzalkonium bromide has the lowest corrosion inhibition efficiency which reaches 69.7%.
FIG. 2 is a graph of the corrosion inhibition efficiency of different component combinations (component ratio 1:2) in a 6% sulfamic acid cleaning solution. As can be seen from fig. 2, in 6% sulfamic acid cleaning solution, the corrosion inhibition efficiency of each combination corrosion inhibitor is between 80% and 99.2%, wherein the corrosion inhibition efficiency of the corrosion inhibitor formed by the combination of sodium dodecyl benzene sulfonate and floutan (total concentration is 0.3%) is the highest and reaches 99.2%. The corrosion inhibitor (total concentration is 0.3%) formed by the combination of urotropine and benzalkonium bromide has the lowest corrosion inhibition efficiency which reaches 80%.
FIG. 3 is a graph of the corrosion inhibition efficiency of different component combinations (component ratio 1:3) in a 10% sulfamic acid cleaning solution. As can be seen from fig. 3, in a 10% sulfamic acid cleaning solution, the corrosion inhibition efficiency of each combination corrosion inhibitor is between 81% and 99.1%, wherein the corrosion inhibition efficiency of the corrosion inhibitor formed by the combination of sodium dodecyl benzene sulfonate and floutan (total concentration is 0.2%) is the highest, and reaches 99.1%. The corrosion inhibitor (total concentration is 0.2%) formed by the combination of urotropine and benzalkonium bromide has the lowest corrosion inhibition efficiency which reaches 81%.
FIG. 4 is a graph of the corrosion inhibition efficiency of various component combinations (component ratio 3:1) in a 5% sulfamic acid cleaning solution. As can be seen from fig. 4, in 5% sulfamic acid cleaning solution, the corrosion inhibition efficiency of each combination corrosion inhibitor is between 74.8% and 90.5%, wherein the corrosion inhibition efficiency of the corrosion inhibitor formed by the combination of sodium dodecyl benzene sulfonate and chlorhexidine (total concentration is 0.2%) is the highest, and reaches 90.5%. The corrosion inhibitor (total concentration is 0.2%) formed by the combination of urotropine and benzalkonium bromide has the lowest corrosion inhibition efficiency which reaches 74.8%.
In order to compare the corrosion inhibition performance of the medicines singly used as the corrosion inhibitor, corrosion coupon test detection is carried out according to the addition amount of 0.2%.
Comparative example 1
1 liter of pickling solution containing 10 percent of sulfamic acid, and 2 grams of sodium dodecyl benzene sulfonate corrosion inhibitor are added to finally form the pickling solution containing 0.2 percent of sodium dodecyl benzene sulfonate corrosion inhibitor. The corrosion inhibition efficiency of the corrosion inhibitor is 80.1 percent through corrosion coupon test detection.
Comparative example 2
1 liter of pickling solution containing 10 percent of sulfamic acid, and 2 grams of urotropine corrosion inhibitor are added to finally form the pickling solution containing 0.2 percent of urotropine corrosion inhibitor. The corrosion inhibition efficiency of the corrosion inhibitor is 75.1 percent through corrosion coupon test detection.
Comparative example 3
1 liter of pickling solution containing 10 percent of sulfamic acid, and 2 grams of rhodine corrosion inhibitor are added to finally form the pickling solution containing 0.2 percent of rhodine corrosion inhibitor. The corrosion inhibition efficiency of the corrosion inhibitor is found to be 87.9% through corrosion coupon test detection.
Comparative example 4
1 liter of pickling solution containing 10 percent of sulfamic acid, and 2 grams of benzalkonium bromide corrosion inhibitor are added to finally form the pickling solution containing 0.2 percent of benzalkonium bromide corrosion inhibitor. The corrosion inhibition efficiency of the corrosion inhibitor is found to be 85.7% through corrosion coupon test detection.
Examples 1 to 6 and comparative examples 1 to 4 are all corrosion inhibition effect tests for descaling and cleaning carbon steel. The corrosion inhibitor of formula I is used for descaling and cleaning 201 stainless steel.
Comparative example 5
The formula I is as follows: the sodium dodecyl benzene sulfonate and the rhodizine compound corrosion inhibitor are used for carrying out corrosion inhibition effect experiments on 201 stainless steel.
(1) Sodium dodecylbenzenesulfonate and the solid of the rhodine corrosion inhibitor were weighed out and dissolved in distilled water, respectively, to prepare aqueous solutions each having a concentration of 5%.
(2) Adding the two aqueous solutions into a pickling solution containing 3%, 6%, 10% and 5% of aminosulfonic acid according to the mass ratio of 1:1, 1:2, 1:3 and 3:1 respectively to finally form the cleaning agent containing 0.1%, 0.3%, 0.2% and 0.2% of corrosion inhibitor.
(3) The corrosion inhibition efficiency of the corrosion inhibitor is 69.6%, 82.3%, 81.5% and 80.5% through corrosion coupon test detection.
TABLE 7 descaling, cleaning and corrosion inhibiting effect of the corrosion inhibitor on 201 stainless steel
As can be seen from comparative examples 1-4, the corrosion inhibition effect of the mixed corrosion inhibitor formula I, formula III and formula IV is obviously better than that of the corrosion inhibitor which is independently used respectively under the same condition.
As can be seen from Table 7, the descaling, cleaning and corrosion inhibiting effects of the formula I on 201 stainless steel are far lower than those on carbon steel.
Claims (10)
1. The carbon steel descaling and cleaning corrosion inhibitor formula is characterized by comprising any two of the following compounds: sodium dodecyl benzene sulfonate, urotropine, tolidine or benzalkonium bromide.
2. The carbon steel descaling and cleaning corrosion inhibitor formula as claimed in claim 1, wherein the mass ratio of the two compounds is 1-3: 3-1.
3. The carbon steel descaling cleaning corrosion inhibitor formulation according to claim 1 or 2, wherein the corrosion inhibitor formulation is selected from one of the following combinations:
1) sodium dodecylbenzene sulfonate and rhodine; the mass ratio of the sodium dodecyl benzene sulfonate to the corydalis is 1-3: 3-1;
2) sodium dodecyl benzene sulfonate and urotropine, wherein the mass ratio of the sodium dodecyl benzene sulfonate to the urotropine is 1-3: 3-1;
3) the mass ratio of the urotropin to the formotin is 1-3: 3-1.
4. The carbon steel descaling and cleaning corrosion inhibitor formula according to claim 3, wherein the mass ratio of sodium dodecyl benzene sulfonate to formotin is 1: 2-3, the mass ratio of sodium dodecyl benzene sulfonate to urotropine is 1: 2-3, and the mass ratio of urotropine to formotin is 1: 2-3.
5. The carbon steel descaling and cleaning corrosion inhibitor formula as claimed in claim 3, wherein the corrosion inhibitor formula comprises sodium dodecyl benzene sulfonate and dibutyl, and the mass ratio of the sodium dodecyl benzene sulfonate to the dibutyl is 1: 2-3.
6. The carbon steel descaling and cleaning corrosion inhibitor formula according to claim 5, wherein the mass ratio of the sodium dodecyl benzene sulfonate to the chlorhexidine is 1: 3.
7. A cleaning agent containing the corrosion inhibitor of any one of claims 1 to 6, which is characterized by comprising 0.1 to 0.3 mass percent of the corrosion inhibitor and 3 to 10 mass percent of sulfamic acid.
8. The cleaning agent according to claim 7, wherein the content of the corrosion inhibitor is 0.2%.
9. The method for using the cleaning agent as claimed in claim 7, which comprises the steps of:
adding the two compounds in the formula into a pickling solution containing sulfamic acid to obtain a cleaning agent containing the corrosion inhibitor; wherein the mass percent of the corrosion inhibitor in the cleaning agent is 0.1-0.3%, and the mass percent of the sulfamic acid is 3% -10%; the pickling environment temperature is 5-40 ℃; the pickling time is 0.5-5 hours.
10. The use method according to claim 9, wherein the pickling mode is as follows: soaking and pickling, or performing circulating pickling by using a pickling circulating pump.
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