CN101191231B - Sulfourea-like carbon steel pickling corrosion inhibitor and application thereof - Google Patents
Sulfourea-like carbon steel pickling corrosion inhibitor and application thereof Download PDFInfo
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- CN101191231B CN101191231B CN2006101344469A CN200610134446A CN101191231B CN 101191231 B CN101191231 B CN 101191231B CN 2006101344469 A CN2006101344469 A CN 2006101344469A CN 200610134446 A CN200610134446 A CN 200610134446A CN 101191231 B CN101191231 B CN 101191231B
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- corrosion inhibitor
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- thiourea
- ethanoyl
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Abstract
The invention relates to a corrosion inhibitor production technical field, in particular to a thiourea-based carbon steel restrainer for avoiding unnecessary corrosion and acid liquor waste in the acid washing process of the carbon steel and manufactures and an application thereof. The corrosion inhibitor which is a compound or combination of the thiourea-based compounds uses the cleaning liquid added with the corrosion inhibitor to submerge and clean the carbon steel, wherein the cleaning liquid is the acid washing liquor of which the concentration is 0.1mol/L to 1mol/L, each liter of acid liquor is added with 0.001g to 2.0g of the corrosion inhibitor and submerges the carbon steel for 0.5 to 4 hours at room temperature. The components of the corrosion inhibitor of the invention are the thiourea-based compounds which have the advantages of non-toxicity, harmlessness, easy synthesis and easily bought and low priced raw materials; moreover, when the surfaces of the carbon steel and manufactures thereof are cleaned by the corrosion inhibitor of the invention, the excessive etching of the base metal and the excessive consumption of the acid liquor during the acid washing process are avoided, thereby the invention has the advantages of low use level, high efficiency and strong sustained action capability.
Description
Technical field
The present invention relates to the inhibiter production technical field, specifically a kind of sulfourea-like carbon steel pickling corrosion inhibitor and application thereof in order to prevent that carbon steel and goods thereof unnecessary corrosion and acid solution in acid cleaning process from consuming.
Background technology
The incrustation scale that pickling is widely used in heat-exchange equipment, heat transfer equipment and cooling apparatus etc. in each industrial sector cleans.From socioeconomic angle, can reduce the fuel that brings because of dirt and expend; From point of view of environment protection, exhaust combustion gases and topsoil have been reduced; From the view of security, heat power equipments such as boiler and interchanger in use form all kinds of dirts gradually, and the bad boiler tube local temperature that causes of these dirt heat conduction raises, and have reduced the intensity of steel, and pipe explosion accident usually takes place, and influence the equipment operation.Therefore, pickling is significant to the normal operation of keeping equipment.
The most frequently used acid of pickling is hydrochloric acid, sulfuric acid.But because acid all has the corrosion of corrosive nature, particularly mineral acid very serious to hardware; The hydrogen of being emitted simultaneously can spread to metal inside, and making by the equipment of washing has the possibility that hydrogen embrittlement takes place; A large amount of sour gas of being separated out in addition can make labor condition worsen.Therefore when pickling, to add inhibiter,, reduce the usage quantity of acid, improve pickling effect, prolong the work-ing life of equipment to suppress the corrosion of metal in acidic medium.
In the inhibiter commonly used at present, mainly comprise the inorganic inhibition compound that contains poisonous chromate, and some organophosphor compounds, its discharging may cause the eutrophication of water body.The inhibiter of existing same domain mostly has toxic side effect, does not possess the market competitiveness.
Therefore, develop new efficient, cheapness, wide material sources, non-harmful organic inhibitor are the new directions of present inhibiter exploitation.
Summary of the invention
The object of the present invention is to provide efficiently, cheapness is easy to get, efficient carbon steel pickling corrosion inhibitor of non-harmful Thiourea and application thereof.
For achieving the above object; technical scheme of the present invention is: the inhibiter composition is a thiourea; described thiourea is: 1-N-(1 '-(1 '; 2 '; 4 '-triazole)) ethanoyl-4-N-(3 "; 5 "-dimethyl) benzoyl-amido thiocarbamide and/or 1-N-(1 '-(1 ', 2 ', 4 '-triazole)) ethanoyl-4-N-benzoyl-amido thiocarbamide.
The inhibiter combined composition is: 1-N-(1 '-(1 '; 2 '; 4 '-triazole)) ethanoyl-4-N-(3 "; 5 "-dimethyl) benzoyl-amido thiocarbamide and 1-N-(1 '-(1 '; 2 '; 4 '-triazole)) ethanoyl-4-N-benzoyl-amido thiocarbamide, its compound proportion by weight is: (1-100): (1-100).
The application of described sulfourea-like carbon steel pickling corrosion inhibitor is to clean steel with the scavenging solution submergence that is added with the Thiourea inhibiter.Scavenging solution is an acid solution, and the amount that adds inhibiter in every liter of acid solution is 0.001g-2.0g, and the submergence temperature is a room temperature, and the time is 0.5-4h;
Wherein: acid solution is dilute hydrochloric acid or dilute sulphuric acid, and concentration is 0.1mol/L-1mol/L.
Principle of the present invention is: thiourea derivatives is to be the compound of significant functional group with the two keys of carbon sulphur, can be adsorbed in steel surface effectively by sulphur atom, plays corrosion inhibition.
The invention has the beneficial effects as follows:
1. inhibiter of the present invention is a thiourea derivative, has easily to synthesize the advantage that raw material is cheap and easy to get.
2. inhibiter of the present invention is organic inhibitor, and is nontoxic, compares with inorganic inhibitor at present commonly used, do not have the environmental problem after the use, harmless to environment and biological nontoxic, meets the trend of inhibiter development, has a good application prospect.
3. the present invention is used for the pickling of carbon steel and products thereof, can effectively suppress harmful corrosion and the consuming of acid solution of metallic matrix in acid, with inhibiter commonly used at present relatively, it is low to have consumption, the efficient height, the outstanding advantage that continuous action ability is strong can be used repeatedly.
Embodiment
The present invention carries out the lacing film zero-G test according to GB10124-88 " metallic substance laboratory uniform corrosion total immersion test method ".
Embodiment 1
Pickle solution is a dilute hydrochloric acid, and concentration is 0.5M, pickle solution consumption 100L; add 1-N-(1 '-(1 ', 2 ', 4;-triazole)) ethanoyl-4-N-(3 ", 5 "-dimethyl) benzoyl-amido thiocarbamide 200g, at ambient temperature steel to be cleaned are immersed in that 2h gets final product in the pickle solution.
The highest inhibition efficiency that obtains by experimental test is 99%, is shown as clean-out system efficiently.
Embodiment 2
Pickle solution is a dilute hydrochloric acid; concentration is 0.5M; pickle solution consumption 100L; adding 1-N-(1 '-(1 ', 2 ', 4 '-triazole)) ethanoyl-4-N-(3 "; 5 "-dimethyl) benzoyl-amido thiocarbamide 15g and 1-N-(1 '-(1 '; 2 ', 4 '-triazole)) ethanoyl-4-N-benzoyl-amido thiocarbamide 15g is immersed in steel to be cleaned that submergence 2h gets final product in the pickle solution at ambient temperature.
The highest inhibition efficiency that obtains by experimental test is 97%, is shown as clean-out system efficiently.
Embodiment 3
Pickle solution is a dilute hydrochloric acid, and concentration is 1M, pickle solution consumption 100L; add 1-N-(1 '-(1 '; 2 ', 4 '-triazole)) ethanoyl-4-N-benzoyl-amido thiocarbamide 50g is immersed in steel to be cleaned that submergence 0.5h gets final product in the pickle solution at ambient temperature.
The highest inhibition efficiency that obtains by experimental test is 97%, is shown as clean-out system efficiently.
Embodiment 4
Pickle solution is a dilute hydrochloric acid; concentration is 1M; pickle solution consumption 100L; add 1-N-(1 '-(1 ', 2 ', 4 '-triazole)) ethanoyl-4-N-benzoyl-amido thiocarbamide 20g and 1-N-(1 '-(1 '; 2 '; 4 '-triazole)) ethanoyl-4-N-(3 ", 5 "-dimethyl) benzoyl-amido thiocarbamide 20g, at ambient temperature steel to be cleaned are immersed in that submergence 1h gets final product in the pickle solution.
The highest inhibition efficiency that obtains by experimental test is 96%, is shown as clean-out system efficiently.
Embodiment 5
Pickle solution is a dilute sulphuric acid, and concentration is 0.1M, pickle solution consumption 100L; adding 1-N-(1 '-(1 ', 2 ', 4 '-triazole)) ethanoyl-4-N-(3 "; 5 "-dimethyl) benzoyl-amido thiocarbamide 0.1g is immersed in steel to be cleaned that submergence 4h gets final product in the pickle solution at ambient temperature.
The highest inhibition efficiency that obtains by experimental test is 80%, is shown as clean-out system efficiently.
Embodiment 6
Pickle solution is a dilute sulphuric acid; concentration is 0.5M; pickle solution consumption 100L; adding 1-N-(1 '-(1 ', 2 ', 4 '-triazole)) ethanoyl-4-N-(3 "; 5 "-dimethyl) benzoyl-amido thiocarbamide 10g and 1-N-(1 '-(1 '; 2 ', 4 '-triazole)) ethanoyl-4-N-benzoyl-amido thiocarbamide 10g is immersed in steel to be cleaned that submergence 4h gets final product in the pickle solution at ambient temperature.
The highest inhibition efficiency that obtains by experimental test is 92%, is shown as clean-out system efficiently.
Embodiment 7
Pickle solution is a dilute sulphuric acid; concentration is 1M; pickle solution consumption 100L; add 1-N-(1 '-(1 ', 2 ', 4 '-triazole)) ethanoyl-4-N-benzoyl-amido thiocarbamide 40g and 1-N-(1 '-(1 '; 2 '; 4 '-triazole)) ethanoyl-4-N-(3 ", 5 "-dimethyl) benzoyl-amido thiocarbamide 50g, at ambient temperature steel to be cleaned are immersed in that submergence 1h gets final product in the pickle solution.
The highest inhibition efficiency that obtains by experimental test is 98%, is shown as clean-out system efficiently.
Claims (2)
1. the application of a sulfourea-like carbon steel pickling corrosion inhibitor is characterized in that: clean steel with the scavenging solution submergence that is added with the Thiourea inhibiter;
Scavenging solution is an acid solution, and the amount that adds inhibiter in every liter of acid solution is 0.001g-2.0g, and the submergence temperature is a room temperature, and the time is 0.5-4h;
Wherein acid solution is dilute hydrochloric acid or dilute sulphuric acid, and concentration is 0.1mol/L-1mol/L;
Thiourea is: 1-N-(1 '-(1 ', 2 ', 4 '-triazole)) ethanoyl-4-N-(3 ", 5 "-dimethyl) benzoyl-amido thiocarbamide and/or 1-N-(1 '-(1 ', 2 ', 4 '-triazole)) ethanoyl-4-N-benzoyl-amido thiocarbamide.
2. according to the application of the described sulfourea-like carbon steel pickling corrosion inhibitor of claim 1; it is characterized in that: the inhibiter combined composition is: 1-N-(1 '-(1 '; 2 '; 4 '-triazole)) ethanoyl-4-N-(3 "; 5 "-dimethyl) benzoyl-amido thiocarbamide and 1-N-(1 '-(1 '; 2 ', 4 '-triazole)) ethanoyl-4-N-benzoyl-amido thiocarbamide, its compound proportion by weight is: (1-100): (1: 100).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101344469A CN101191231B (en) | 2006-12-01 | 2006-12-01 | Sulfourea-like carbon steel pickling corrosion inhibitor and application thereof |
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| CN2006101344469A CN101191231B (en) | 2006-12-01 | 2006-12-01 | Sulfourea-like carbon steel pickling corrosion inhibitor and application thereof |
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| Publication Number | Publication Date |
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| CN101191231A CN101191231A (en) | 2008-06-04 |
| CN101191231B true CN101191231B (en) | 2011-04-20 |
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| CN101914775A (en) * | 2010-06-29 | 2010-12-15 | 青岛大学 | Water-soluble anthranilic acid polymer carbon steel acid cleaning inhibitor and application thereof |
| CN104357856A (en) * | 2014-11-07 | 2015-02-18 | 南京溧水振兴船舶附件有限公司 | Ship metal surface pickling agent and preparation method thereof |
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Non-Patent Citations (1)
| Title |
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| 司国栋.《新型三唑类化合物的合成与生物活性研究以及新型烟碱类杀虫剂噻虫嗪的合成研究》.《新型三唑类化合物的合成与生物活性研究以及新型烟碱类杀虫剂噻虫嗪的合成研究》.2006, * |
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