CN109112548B - anti-CO (carbon monoxide)2Corrosion inhibitor for corrosion gathering and transportation pipeline - Google Patents
anti-CO (carbon monoxide)2Corrosion inhibitor for corrosion gathering and transportation pipeline Download PDFInfo
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- CN109112548B CN109112548B CN201811149893.0A CN201811149893A CN109112548B CN 109112548 B CN109112548 B CN 109112548B CN 201811149893 A CN201811149893 A CN 201811149893A CN 109112548 B CN109112548 B CN 109112548B
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- 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
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Abstract
anti-CO (carbon monoxide)2The corrosion inhibitor for the corrosion gathering and transportation pipeline comprises 50-60% of bis-imidazoline quaternary ammonium salt and alkyl/aryl bis10-40% of sodium thiocarbamate and 10-40% of solvent. The corrosion inhibitor can be used at higher temperature and high CO2In the partial pressure gathering and transportation environment, metal pipelines and equipment are effectively protected. The corrosion inhibitor has the characteristics of good corrosion resistance effect, small using amount and low cost in the industrial production and application processes.
Description
Technical Field
The invention relates to the field of chemical industry, in particular to an anti-CO2Corrosion inhibitor for corrosion gathering and transportation pipeline.
Background
CO2Is often used as a component of natural gas or petroleum associated gas and exists in oil gas, and CO is adopted2The technology for improving the oil recovery rate also uses CO2Carrying in crude oil gathering and transportation system, CO2After being dissolved in water, the corrosion inhibitor has strong corrosivity on steel, can cause rapid overall corrosion and severe local corrosion of the steel, and leads to corrosion failure of pipelines and equipment. The oil-gas well often contains a large amount of calcium, magnesium and barium plasma, which is easy to generate carbonate and corrosion product FeCO3Deposit together on the surfaces of pipes and equipment in the form of scale, causing blockages, CO2The presence of these compounds promotes the deposition of scale and corrosion products on the pipe wall, which exacerbates problems such as waxing, asphalting, and blistering.
The addition of corrosion inhibitors is the most common for inhibiting CO2One method of etching. Currently the most commonly used anti-CO2The corrosion inhibitor is mainly prepared from imidazoline derivatives, and is compounded with quinoline quaternary ammonium salt, pyridine quaternary ammonium salt, thiourea and derivatives thereof to improve the corrosion inhibition performance of imidazoline, but the quinoline quaternary ammonium salt and the pyridine quaternary ammonium salt are high in price, and the thiourea and the derivatives thereof have different optimal use concentrations in different corrosion media, so that corrosion is promoted when the concentration is too high or too low, but the monocyclic imidazoline derivatives are easy to desorb at high temperature, so that the corrosion inhibition effect is reduced, and the corrosion inhibitor is compounded with quinoline quaternary ammonium salt, pyridine quaternary ammonium salt, thiourea and the derivatives2The product is used at a content ofThe amount is large. In recent years, in order to increase the adsorption performance of imidazoline derivatives at high temperature, dimer acid and polyethylene polyamine are reacted to prepare bicyclic imidazoline derivatives, the corrosion inhibition performance of the bicyclic imidazoline derivatives is greatly improved compared with that of monocyclic imidazoline derivatives, but the derivatives are poor in water solubility, and the application of the bicyclic imidazoline derivatives is greatly influenced.
Disclosure of Invention
The invention aims to provide a CO-resistant material2Corrosion inhibitors for corrosion gathering pipelines, which are suitable for use at higher temperatures and with high CO content2The corrosion resistance effect is good, the dosage is less and the cost is low under the partial pressure environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
anti-CO (carbon monoxide)2The corrosion inhibitor for the corrosion gathering and transportation pipeline comprises 50-60% of bis-imidazoline quaternary ammonium salt, 10-40% of alkyl/aryl sodium dithiocarbamate and 10-40% of solvent by mass percent.
The invention is further improved in that the solvent comprises 50-60% of bi-imidazoline quaternary ammonium salt, 10-20% of alkyl/aryl sodium dithiocarbamate and 20-40% of solvent by mass percent.
The invention is further improved in that the solvent comprises 50-60% of bi-imidazoline quaternary ammonium salt, 20-40% of alkyl/aryl sodium dithiocarbamate and 10-30% of solvent by mass percent.
In a further development of the invention, the solvent is water or N, N-dimethylformamide.
In a further improvement of the invention, the bis-imidazoline quaternary ammonium salt is prepared by the following process: adding oleic acid and diethylenetriamine into a reactor according to the molar ratio of 1:1, reacting for 3-5 hours at 140-160 ℃, and then vacuumizing and dehydrating for 6 hours at 220-240 ℃ to obtain an imidazoline intermediate; and adding sulfuric acid and epoxy chloropropane into the imidazoline intermediate, and reacting for 11-13 h at 105-110 ℃ to obtain the bisimidazoline quaternary ammonium salt.
The invention is further improved in that the temperature is raised from 140-160 ℃ to 220-240 ℃ at a rate of 1-2 ℃/min.
The invention is further improved in that the mass ratio of the imidazoline intermediate, epichlorohydrin and sulfuric acid is 4:2: 1; the mass concentration of sulfuric acid was 95%.
The invention is further improved in that the alkyl/aryl sodium dithiocarbamate is sodium dimethyldithiocarbamate, sodium diethyldithiocarbamate, sodium di-n-butyldithiocarbamate, sodium phenyldithiocarbamate or sodium benzyldithiocarbamate.
Compared with the prior art, the invention has the following beneficial effects: CO resistance of the invention2The bi-imidazoline quaternary ammonium salt in the corrosion inhibitor has good water solubility, the molecule contains two imidazoline rings, the bonding force with the metal surface is stronger, the sodium alkyl dithiocarbamate molecule contains a plurality of N, S atoms and has stronger interaction with the metal surface, and simultaneously the sodium alkyl dithiocarbamate can effectively fill the gap in an adsorption film formed by the bi-imidazoline on the metal surface, so that the adsorption film of the corrosion inhibitor is more compact, thereby having better CO resistance2The nature of the corrosion. The corrosion inhibitor of the invention is used for inhibiting high CO content in the oil and gas field exploitation, gathering and transportation process2The medium is a high-efficiency corrosion inhibitor for equipment corrosion, and has the characteristics of good corrosion resistance effect, small using amount and low cost. And through experimental tests, a better synergistic effect exists between the diimidazoline quaternary ammonium salt and the sodium alkyl dithiocarbamate, and the diimidazoline quaternary ammonium salt and the sodium alkyl dithiocarbamate are compounded to have high content of CO2Has good inhibition effect on corrosion and low slow release rate.
Drawings
FIG. 1 is a schematic diagram of the reaction scheme of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples, but the present invention is not limited to the scope of this example.
The invention relates to a CO-resistant composite material which is prepared by taking bis-imidazoline quaternary ammonium salt as a main agent, compounding sodium alkyl/aryl dithiocarbamate and adding a solvent2Corrosion inhibitors.
anti-CO (carbon monoxide)2The corrosion inhibitor comprises 50-60% of bis-imidazoline quaternary ammonium salt and alkane according to mass percentage10-40% of sodium aryl/aryl dithiocarbamate and 10-40% of solvent.
Wherein the solvent is water or N, N-dimethylformamide.
Referring to fig. 1, the bis-imidazoline quaternary ammonium salt is obtained by the following process: sequentially adding oleic acid and diethylenetriamine into a reactor with a stirring and distilling device according to the molar ratio of 1:1, reacting for 3-5 hours at 140-160 ℃, slowly heating to 220-240 ℃ at the speed of 1-2 ℃/min, vacuumizing, dehydrating for 6 hours, and cooling to obtain the imidazoline intermediate. And (2) sequentially and slowly adding sulfuric acid (with the mass concentration of 95%) and epoxy chloropropane (the mass ratio of the imidazoline intermediate, the epoxy chloropropane and the sulfuric acid is 4:2:1) into the imidazoline intermediate at room temperature, reacting for 11-13 h at the temperature of 95-105 ℃, and cooling to obtain the bisimidazoline quaternary ammonium salt.
The alkyl/aryl sodium dithiocarbamate can be sodium dimethyldithiocarbamate, sodium diethyldithiocarbamate, sodium di-n-butyldithiocarbamate, sodium phenyldithiocarbamate or sodium benzyldithiocarbamate.
Sodium alkyldithiocarbamate can be prepared by the following method: adding a certain amount of NaOH and water into a reactor to obtain a sodium hydroxide solution, cooling, adding a certain amount of amine (dimethylamine, diethylamine, di-n-butylamine, aniline or benzylamine), stirring in an ice water bath, and cooling. When the temperature is reduced to about 0 ℃, slowly dripping CS2The dropping speed was controlled so that the temperature was maintained at 20 ℃ or lower. After the addition of CS2, the mixture was stirred at a constant temperature of 45 ℃ for 2 hours. Cooling, crystallizing at-5 ℃, filtering, and vacuum drying at 40-45 ℃ overnight to obtain the sodium phenyldithiocarbamate.
The solvent may be water or N, N-dimethylformamide.
CO resistance of the invention2The preparation method of the corrosion inhibitor comprises the step of uniformly mixing 50-60% of bis-imidazoline quaternary ammonium salt, 10-40% of sodium alkyl dithiocarbamate and 10-40% of solvent by mass percent.
The method for measuring the corrosion rate of the corrosion inhibitor in each embodiment of the invention comprises the following steps: medium composition: cl-1:1823.2mg/L、HCO3 -： 1263.4mg/L、Ca2+:116.3mg/L、Mg2+：17.6mg/L、Na+1490.1 mg/L, a test temperature of 80 ℃, a test time of 24 hours and a test material of A3 steel, wherein the A3 steel is polished to be bright, washed by petroleum ether, acetone and ethanol, dried and weighed, the prepared sample is put into an autoclave, 100ppm of prepared corrosion inhibitor is added, the mixture is stirred uniformly, the weighed A3 steel is hung into the autoclave and sealed, and high-purity N is used for the test2After deoxygenation for 4h, the temperature is raised to 80 ℃, and high-purity CO is introduced2And maintain CO2And (3) taking out the sample after the pressure is 2.0MPa and the sample is stabilized for 24 hours under the condition, removing a corrosion product film on the surface of the sample, weighing after drying and calculating the corrosion rate.
Example 1
The bis-imidazoline quaternary ammonium salt is prepared by the following processes: sequentially adding oleic acid and diethylenetriamine into a reactor with a stirring and distilling device according to the mol ratio of 1:1, reacting for 5 hours at 140 ℃, slowly heating to 220 ℃ at the speed of 1 ℃/min, vacuumizing, dehydrating for 6 hours, and cooling to obtain an imidazoline intermediate. Slowly adding sulfuric acid (with the mass concentration of 95%) and epoxy chloropropane (the mass ratio of the imidazoline intermediate to the epoxy chloropropane to the sulfuric acid is 4:2:1) into the imidazoline intermediate at room temperature, reacting for 13h at 95 ℃, and cooling to obtain the bisimidazoline quaternary ammonium salt.
The corrosion inhibitor comprises the following components in percentage by weight: 50% of bisimidazoline quaternary ammonium salt, 20% of sodium dimethyldithiocarbamate and 30% of water. The corrosion inhibitor of the formula has good water solubility in a test medium, and the corrosion rate is 0.1376 mm/a.
Example 2
The bis-imidazoline quaternary ammonium salt is prepared by the following processes: sequentially adding oleic acid and diethylenetriamine into a reactor with a stirring and distilling device according to the mol ratio of 1:1, reacting for 4 hours at 150 ℃, slowly heating to 230 ℃ at the speed of 2 ℃/min, vacuumizing, dehydrating for 6 hours, and cooling to obtain an imidazoline intermediate. Slowly adding sulfuric acid (with the mass concentration of 95%) and epoxy chloropropane (the mass ratio of the imidazoline intermediate, the epoxy chloropropane and the sulfuric acid is 4:2:1) into the imidazoline intermediate at room temperature, reacting for 12h at 100 ℃, and cooling to obtain the bisimidazoline quaternary ammonium salt.
The corrosion inhibitor comprises the following components in percentage by weight: 50% of bisimidazoline quaternary ammonium salt, 20% of sodium diethyldithiocarbamate and 30% of water. The corrosion inhibitor of the formula has good water solubility in a test medium, and the corrosion rate is 0.1299 mm/a.
Example 3
The bis-imidazoline quaternary ammonium salt is prepared by the following processes: sequentially adding oleic acid and diethylenetriamine into a reactor with a stirring and distilling device according to the mol ratio of 1:1, reacting for 3 hours at 160 ℃, then slowly heating to 230 ℃ at the speed of 1.5 ℃/min, vacuumizing, dehydrating for 6 hours, and cooling to obtain the imidazoline intermediate. Slowly adding sulfuric acid (with the mass concentration of 95%) and epoxy chloropropane (the mass ratio of the imidazoline intermediate, the epoxy chloropropane and the sulfuric acid is 4:2:1) into the imidazoline intermediate at room temperature, reacting for 12h at 100 ℃, and cooling to obtain the bisimidazoline quaternary ammonium salt.
The corrosion inhibitor comprises the following components in percentage by weight: 50% of bisimidazoline quaternary ammonium salt, 20% of sodium di-n-butyldithiocarbamate and 30% of water. The corrosion inhibitor of the formula has good water solubility in a test medium, and the corrosion rate is 0.1105 mm/a.
Example 4
The bis-imidazoline quaternary ammonium salt is prepared by the following processes: sequentially adding oleic acid and diethylenetriamine into a reactor with a stirring and distilling device according to the mol ratio of 1:1, reacting for 3 hours at 145 ℃, slowly heating to 220 ℃ at the speed of 1 ℃/min, vacuumizing, dehydrating for 6 hours, and cooling to obtain an imidazoline intermediate. Slowly adding sulfuric acid (with the mass concentration of 95%) and epoxy chloropropane (the mass ratio of the imidazoline intermediate to the epoxy chloropropane to the sulfuric acid is 4:2:1) into the imidazoline intermediate at room temperature, reacting for 12h at 95 ℃, and cooling to obtain the bisimidazoline quaternary ammonium salt.
The corrosion inhibitor comprises the following components in percentage by weight: 50% of bisimidazoline quaternary ammonium salt, 20% of sodium phenyldithiocarbamate and 30% of N, N-dimethylformamide. The corrosion inhibitor of the formula has good dispersibility in a test medium, and the corrosion rate is 0.0727 mm/a.
Example 5
The bis-imidazoline quaternary ammonium salt is prepared by the following processes: sequentially adding oleic acid and diethylenetriamine into a reactor with a stirring and distilling device according to the mol ratio of 1:1, reacting for 5 hours at 155 ℃, slowly heating to 230 ℃ at the speed of 1.5 ℃/min, vacuumizing, dehydrating for 6 hours, and cooling to obtain the imidazoline intermediate. Slowly adding sulfuric acid (with the mass concentration of 95%) and epoxy chloropropane (the mass ratio of the imidazoline intermediate to the epoxy chloropropane to the sulfuric acid is 4:2:1) into the imidazoline intermediate at room temperature, reacting for 11h at 100 ℃, and cooling to obtain the bisimidazoline quaternary ammonium salt.
The corrosion inhibitor comprises the following components in percentage by weight: 50% of bisimidazoline quaternary ammonium salt, 20% of sodium benzyldithiocarbamate and 30% of water. The corrosion inhibitor of the formula has good water solubility in a test medium, and the corrosion rate is 0.0985 mm/a.
Example 6
The bis-imidazoline quaternary ammonium salt is prepared by the following processes: sequentially adding oleic acid and diethylenetriamine into a reactor with a stirring and distilling device according to the mol ratio of 1:1, reacting for 5 hours at 140 ℃, slowly heating to 220 ℃ at the speed of 1 ℃/min, vacuumizing, dehydrating for 6 hours, and cooling to obtain an imidazoline intermediate. Slowly adding sulfuric acid (with the mass concentration of 95%) and epoxy chloropropane (the mass ratio of the imidazoline intermediate to the epoxy chloropropane to the sulfuric acid is 4:2:1) into the imidazoline intermediate at room temperature, reacting for 13h at 95 ℃, and cooling to obtain the bisimidazoline quaternary ammonium salt.
The corrosion inhibitor comprises the following components in percentage by weight: 60% of bisimidazoline quaternary ammonium salt, 20% of sodium diethyldithiocarbamate and 20% of N, N-dimethylformamide. The corrosion inhibitor of the formula has good dispersibility in a test medium, and the corrosion rate is 0.0597 mm/a.
Example 7
The bis-imidazoline quaternary ammonium salt is prepared by the following processes: sequentially adding oleic acid and diethylenetriamine into a reactor with a stirring and distilling device according to the mol ratio of 1:1, reacting for 4 hours at 150 ℃, slowly heating to 230 ℃ at the speed of 2 ℃/min, vacuumizing, dehydrating for 6 hours, and cooling to obtain an imidazoline intermediate. Slowly adding sulfuric acid (with the mass concentration of 95%) and epoxy chloropropane (the mass ratio of the imidazoline intermediate, the epoxy chloropropane and the sulfuric acid is 4:2:1) into the imidazoline intermediate at room temperature, reacting for 12h at 100 ℃, and cooling to obtain the bisimidazoline quaternary ammonium salt.
The corrosion inhibitor comprises the following components in percentage by weight: 55% of bisimidazoline quaternary ammonium salt, 20% of sodium phenyldithiocarbamate and 25% of N, N-dimethylformamide. The corrosion inhibitor of the formula has good dispersibility in a test medium, and the corrosion rate is 0.0662 mm/a.
Example 8
The bis-imidazoline quaternary ammonium salt is prepared by the following processes: sequentially adding oleic acid and diethylenetriamine into a reactor with a stirring and distilling device according to the mol ratio of 1:1, reacting for 3 hours at 160 ℃, then slowly heating to 230 ℃ at the speed of 1.5 ℃/min, vacuumizing, dehydrating for 6 hours, and cooling to obtain the imidazoline intermediate. Slowly adding sulfuric acid (with the mass concentration of 95%) and epoxy chloropropane (the mass ratio of the imidazoline intermediate, the epoxy chloropropane and the sulfuric acid is 4:2:1) into the imidazoline intermediate at room temperature, reacting for 12h at 100 ℃, and cooling to obtain the bisimidazoline quaternary ammonium salt.
The corrosion inhibitor comprises the following components in percentage by weight: 50% of bisimidazoline quaternary ammonium salt, 10% of sodium phenyldithiocarbamate and 40% of N, N-dimethylformamide. The corrosion inhibitor of the formula has good dispersibility in a test medium, and the corrosion rate is 0.0810 mm/a.
Example 9
The bis-imidazoline quaternary ammonium salt is prepared by the following processes: sequentially adding oleic acid and diethylenetriamine into a reactor with a stirring and distilling device according to the mol ratio of 1:1, reacting for 3 hours at 145 ℃, slowly heating to 220 ℃ at the speed of 1 ℃/min, vacuumizing, dehydrating for 6 hours, and cooling to obtain an imidazoline intermediate. Slowly adding sulfuric acid (with the mass concentration of 95%) and epoxy chloropropane (the mass ratio of the imidazoline intermediate to the epoxy chloropropane to the sulfuric acid is 4:2:1) into the imidazoline intermediate at room temperature, reacting for 12h at 95 ℃, and cooling to obtain the bisimidazoline quaternary ammonium salt.
The corrosion inhibitor comprises the following components in percentage by weight: 50% of bisimidazoline quaternary ammonium salt, 30% of sodium phenyldithiocarbamate and 20% of N, N-dimethylformamide. The corrosion inhibitor of the formula has good dispersibility in a test medium, and the corrosion rate is 0.0654 mm/a.
Example 10
The bis-imidazoline quaternary ammonium salt is prepared by the following processes: sequentially adding oleic acid and diethylenetriamine into a reactor with a stirring and distilling device according to the mol ratio of 1:1, reacting for 5 hours at 155 ℃, slowly heating to 230 ℃ at the speed of 1.5 ℃/min, vacuumizing, dehydrating for 6 hours, and cooling to obtain the imidazoline intermediate. Slowly adding sulfuric acid (with the mass concentration of 95%) and epoxy chloropropane (the mass ratio of the imidazoline intermediate to the epoxy chloropropane to the sulfuric acid is 4:2:1) into the imidazoline intermediate at room temperature, reacting for 11h at 100 ℃, and cooling to obtain the bisimidazoline quaternary ammonium salt.
The corrosion inhibitor comprises the following components in percentage by weight: 50% of bisimidazoline quaternary ammonium salt, 40% of sodium phenyldithiocarbamate and 10% of N, N-dimethylformamide. The corrosion inhibitor of the formula has good dispersibility in a test medium, and the corrosion rate is 0.0616 mm/a.
Comparative example:
the corrosion inhibitor is the bis-imidazoline quaternary ammonium salt in the embodiment 1, the addition amount is 100ppm, the water solubility in the testing medium is good, and the corrosion rate is 0.1868 mm/a.
The above examples show that the bis-imidazoline quaternary ammonium salt and the sodium alkyl dithiocarbamate have good synergistic effect, and the two are compounded to high content CO2Has good inhibition effect on corrosion.
Claims (7)
1. anti-CO (carbon monoxide)2The corrosion inhibitor for the corrosion gathering and transportation pipeline is characterized by comprising 50-60% of bis-imidazoline quaternary ammonium salt, 10-40% of alkyl/aryl sodium dithiocarbamate and 10-40% of solvent by mass percent; wherein, the bis-imidazoline quaternary ammonium salt is prepared by the following steps: adding oleic acid and diethylenetriamine into a reactor according to the mol ratio of 1:1, reacting for 3-5 hours at 140-160 ℃, and then at 220-240 DEG CVacuumizing and dehydrating for 6 hours to obtain an imidazoline intermediate; and adding sulfuric acid and epoxy chloropropane into the imidazoline intermediate, and reacting for 11-13 h at 105-110 ℃ to obtain the bisimidazoline quaternary ammonium salt.
2. A CO-resistant composition according to claim 12The corrosion inhibitor for the corrosion gathering and transportation pipeline is characterized by comprising 50-60% of bis-imidazoline quaternary ammonium salt, 10-20% of alkyl/aryl sodium dithiocarbamate and 20-40% of solvent by mass percent.
3. A CO-resistant composition according to claim 12The corrosion inhibitor for the corrosion gathering and transportation pipeline is characterized by comprising 50-60% of bis-imidazoline quaternary ammonium salt, 20-40% of alkyl/aryl sodium dithiocarbamate and 10-30% of solvent by mass percent.
4. An anti-CO according to any one of claims 1 to 32The corrosion inhibitor for the corrosion gathering and transportation pipeline is characterized in that the solvent is water or N, N-dimethylformamide.
5. A CO-resistant composition according to claim 42The corrosion inhibitor for the corrosion gathering and transportation pipeline is characterized in that the temperature is increased from 140-160 ℃ to 220-240 ℃ at the speed of 1-2 ℃/min.
6. A CO-resistant composition according to claim 12The corrosion inhibitor for the corrosion gathering and transportation pipeline is characterized in that the mass ratio of the imidazoline intermediate, the epichlorohydrin and the sulfuric acid is 4:2: 1; the mass concentration of sulfuric acid was 95%.
7. An anti-CO according to any one of claims 1 to 32The corrosion inhibitor for the corrosion gathering pipeline is characterized in that the alkyl/aryl sodium dithiocarbamate is sodium dimethyldithiocarbamate, sodium diethyldithiocarbamate, sodium di-n-butyldithiocarbamate, sodium phenyldithiocarbamate or sodium benzyldithiocarbamate.
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