CN101245466B - Green oxadiazoles carbon steel restrainer and uses thereof - Google Patents
Green oxadiazoles carbon steel restrainer and uses thereof Download PDFInfo
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- CN101245466B CN101245466B CN2007100137324A CN200710013732A CN101245466B CN 101245466 B CN101245466 B CN 101245466B CN 2007100137324 A CN2007100137324 A CN 2007100137324A CN 200710013732 A CN200710013732 A CN 200710013732A CN 101245466 B CN101245466 B CN 101245466B
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Abstract
The invention relates to a corrosion inhibiter for acid pickling steels, in particular to an environment-friendly triazole corrosion inhibiter for acid pickling carbon steels, can avoid the corrosion of acid to carbon steel and products thereof in the acid picking process and over consumption of acidizing fluid and application thereof. The components of corrosion inhibiter are 4-methoxy acetophenone-O-1'- (1', 3', 4'-ltriazole) methylene oxime and/or 1- (4'- N, N-dimethyl benzene methylene imino) - 2 - sulfhydryl -5- (1'(1', 3', 4'-triazole) methylene)-1, 3, 4-triazole. The corrosion inhibiter of the invention can effectively prevent corrosion of acid to carbon steel materials in the acid picking process and has the outstanding advantages of low consumption, high corrosion inhibition efficiency, and stable corrosion inhibiting performance. Besides, the corrosion inhibiter for acid pickling steels of the invention has no pollution to environment with wide market prospect.
Description
Technical field
The present invention relates to the acid washing rolled steel inhibiter, specifically in order to prevent carbon steel and goods thereof sour corrosion and outspent a kind of green oxadiazoles carbon steel restrainer of acid solution and application thereof in acid cleaning process to carbon steel material.
Background technology
The corrosion of strong acid clean surface, dirt are the important cleaning means of metal material surface pre-treatment, pipeline and the scale removal of boiler systems cleaning.Significant because of pickling to the normal operation of keeping equipment, still in industries such as metallic substance, machinery, metallurgy, chemical industry, be extensive use of so far.
Because strong acid all has corrosive nature to hardware, " crossing erosion " phenomenon often appears in the acid cleaning process, promptly not only removed the corrosion and the dirt of metallic surface in the acid cleaning process, simultaneously the part metals base material has also been disposed in the lump.Therefore both can cause Corrosion of Metallic Materials in the acid cleaning process, produced simultaneously a large amount of acid solutions have caused havoc to environment.Adding inhibiter when pickling, is to suppress the corrosion of metal in acidic medium, reduces the usage quantity of acid, improves pickling effect, prolongs the effective way of service life of equipment.
In the inhibiter commonly used at present, mainly comprise mineral compound such as chromic salt, nitrate, nitrite, because it has toxic side effect, environment friendly is relatively poor, and its application is being restricted and will progressively eliminating.And green corrosion inhibitor is not only nontoxic to environment in the process of using, and also can not cause detrimentally affect to environment in production and manufacturing processed.Therefore, develop new efficient, environmental protection, cheapness, the organic inhibitor that is easy to get has higher productive value and vast market prospect.
Summary of the invention
The object of the present invention is to provide a kind of efficient, the green oxadiazoles carbon steel restrainer of environmental protection and application thereof.
For achieving the above object, technical scheme of the present invention is: a kind of application of oxadiazoles carbon steel restrainer, clean steel with the acid solution submergence that is added with inhibiter, it is characterized in that: the inhibiter composition is a triazole compound, described triazole compound is 4-methyl acetophenone-O-1-(1 ' 3 ' 4-triazole) methylene radical oxime 20g and 1-(4 '-N, N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 "-(1 " 3 " 4 "-triazole) methylene radical]-1,3, the combination of 4-triazole 20g, pickle solution is a dilute hydrochloric acid, concentration is 0.5mol/L, and pickle solution consumption 100L is immersed in 4h in the pickle solution with steel to be cleaned at ambient temperature.
Principle of the present invention is: the triazole class inhibiter that the present invention relates to is the compound with three nitrogen heterocycles, this compound also contains three nitrogen heterocyclics, intramolecularly contain nitrogen-atoms, phenyl ring ,-atomic groups such as the two keys of C=N-, can be adsorbed in steel surface effectively, play corrosion inhibition.
The advantage that the present invention had:
1. cost is low.Inhibiter of the present invention is triazole compound and derivative thereof, and synthesis step is simple, and raw material is cheap and easy to get; Belong to green type inhibiter,
2. environmental friendliness.Inhibiter of the present invention is a triazole compound, is organic inhibitor, compares with inorganic inhibitor at present commonly used, and is nontoxic, do not have the environmental problem after the use; Harmless to environment and biological nontoxic, meet the trend that green corrosion inhibitor develops,
3. consumption is low, and result of use is good.The present invention is used for the steel surface pickling, add consuming excessively of excessive etch that a spot of inhibiter just can effectively suppress metallic substance metal in acid cleaning process (promptly harmful corrosion) and acid solution, with inhibiter at present commonly used relatively, have that consumption is low, inhibition efficiency is high, continuous action ability is strong, repeatedly used outstanding advantage.
4. corrosion inhibition is stable.The present invention can bear the variation of cleaning condition, as detergent concentration, temperature, flow velocity etc., does not influence the corrosion mitigating effect of inhibiter.
Embodiment
The present invention carries out 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, and pickle solution consumption 100L adds 4-methyl acetophenone-O-1 '-(1 ' .3 ' .4 '-triazole) methylene radical oxime 30g, at ambient temperature steel to be cleaned is immersed in 4h in the pickle solution.
The highest inhibition efficiency that obtains by experimental test is 95%, is shown as inhibiter efficiently.
Embodiment 2
Pickle solution is a dilute hydrochloric acid, concentration is 0.5M, pickle solution consumption 100L, add respectively 4-methyl acetophenone-O-1 '-(1 ' 3 ' 4-triazole) methylene radical oxime, 1-(4 '-N, N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 " (1 " 3 ' ' 4 " triazole) methylene radical]-1; 3,4-triazole 20g is immersed in steel to be cleaned submergence 4h in the pickle solution at ambient temperature.
The highest inhibition efficiency that obtains by experimental test is 97%, is shown as inhibiter efficiently.
Embodiment 3
Pickle solution is a dilute hydrochloric acid, concentration is 1M, pickle solution consumption 100L, adding 1-(4 '-N, N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 " (1 " 3 " 4 "-triazoles) methylene radical]-1,3,4-triazole 40g 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 93%, is shown as inhibiter efficiently.
Embodiment 4
Pickle solution is a dilute hydrochloric acid, concentration is 1M, pickle solution consumption 100L, adding 4-methyl acetophenone-O-1 '-(1 ' 3 ' 4-triazole) methylene radical oxime, 20g and 1-(4 '-N, N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 " (1 " 3 " 4 "-triazoles) methylene radical]-1,3,4-triazole 20g 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 96%, is shown as inhibiter efficiently.
Embodiment 5
Pickle solution is a dilute hydrochloric acid, and concentration is 0.8M, and pickle solution consumption 100L adds 4-methyl acetophenone-O-1 '-(1 ' 3 ' 4-triazole) methylene radical oxime 35g, at ambient temperature steel to be cleaned is immersed in 4h in the pickle solution.
The highest inhibition efficiency that obtains by experimental test is 93%, is shown as inhibiter efficiently.
Embodiment 6
Pickle solution is a dilute hydrochloric acid, concentration is 0.8M, pickle solution consumption 100L, adding 4-methyl acetophenone-0-1 '-(1 ' 3 ' 4-triazole) methylene radical oxime 20g and 1-(4 '-N, N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 " (1 " 3 " 4 "-triazoles) methylene radical]-1,3,4-triazole 20g is immersed in steel to be cleaned submergence 4h in the pickle solution at ambient temperature.
The highest inhibition efficiency that obtains by experimental test is 97%, is shown as inhibiter efficiently.
Embodiment 7
Pickle solution is a dilute sulphuric acid, concentration is 0.1M, pickle solution consumption 100L, adding 1-(4 '-N, N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 " (1 " 3 " 4 "-triazoles) methylene radical]-1,3,4-triazole 15g is immersed in steel to be cleaned that submergence 3h gets final product in the pickle solution at ambient temperature.
The highest inhibition efficiency that obtains by experimental test is 94%, is shown as inhibiter efficiently.
Embodiment 8
Pickle solution is a dilute sulphuric acid, concentration is 0.1M, pickle solution consumption 100L, adding 1-(4 '-N, N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 " (1 " 3 " 4 "-triazoles) methylene radical]-1,3,4-triazole 20g and 4-methyl acetophenone-O-1 '-(1 ' 3 ' 4-triazole) methylene radical oxime 15g is immersed in steel to be cleaned that submergence 3h gets final product in the pickle solution at ambient temperature.
The highest inhibition efficiency that obtains by experimental test is 96%, is shown as inhibiter efficiently.
Embodiment 9
Pickle solution is a dilute sulphuric acid, and concentration is 0.1M, and pickle solution consumption 100L adds 4-methyl acetophenone-O-1 '-(1 ' 3 ' 4-triazole) methylene radical oxime 20g, at ambient temperature steel to be cleaned is immersed in that submergence 3h gets final product in the pickle solution.
The highest inhibition efficiency that obtains by experimental test is 93%, is shown as inhibiter efficiently.
Embodiment 10
Pickle solution is a dilute sulphuric acid, and concentration is 0.5M, and pickle solution consumption 100L adds 4-methyl acetophenone-O-1-(1 ' 3 ' 4-triazole) methylene radical oxime 35g, at ambient temperature steel to be cleaned is immersed in that submergence 3h gets final product in the pickle solution.
The highest inhibition efficiency that obtains by experimental test is 98%, is shown as inhibiter efficiently.
Embodiment 12
Pickle solution is a dilute sulphuric acid, concentration is 0.5M, pickle solution consumption 100L, adding 1-(4 '-N, N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 " (1 " 3 " 4 "-triazoles) methylene radical]-1,3,4-triazole 15g and 4-methyl acetophenone-O-1-(1 ' 3 ' 4-triazole) methylene radical oxime 20g is immersed in steel to be cleaned that submergence 3h gets final product in the pickle solution at ambient temperature.
The highest inhibition efficiency that obtains by experimental test is 96%, is shown as inhibiter efficiently.
Embodiment 13
Difference from Example 1 is:
The inhibiter that it adopted be 1-(4 '-N, N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 " (1 " 3 " 4 "-triazoles) methylene radical]-1,3, the 4-triazole, its add-on is 200g.
Embodiment 14
Be with embodiment 12 differences:
The inhibiter that it adopted be 1-(4 '-N, N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 ' '-(1 " 3 " 4 " triazole) methylene radical]-1; 3; 4-triazole and 4-methyl acetophenone-O-1-(1 ' 3 ' 4-triazole) methylene radical oxime; its add-on is: 1-(4 '-N; N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 " (1 " 3 " 4 "-triazoles) methylene radical]-1,3,4-triazole 1g and 4-methyl acetophenone-O-1-(1 ' 3 ' 4-triazole) methylene radical oxime 100g.
Embodiment 15
Be with embodiment 12 differences:
The inhibiter that it adopted be 1-(4 '-N, N-dimethyl benzene time auxotox radical)-and 2-sulfydryl-5-[1 ' '-(1 ' ' 3 " 4 "-triazole) methylene radical]-1,3,4-triazole and 4-methyl acetophenone-O-1-(1 ' 3 ' 4-triazole) methylene radical oxime, its add-on is: 1-(4 '-N, N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 " (1 " 3 " 4 "-triazoles) methylene radical]-1,3,4-triazole 100g and 4-methyl acetophenone-O-1-(1 ' 3 ' 4-triazole) methylene radical oxime 1g.
Embodiment 16
Difference from Example 7 is:
The inhibiter that it adopted is 4-methyl acetophenone-O-1-(1 ' 3 ' 4-triazole) methylene radical oxime, and its add-on is 0.01g
Embodiment 17
Difference from Example 7 is:
The inhibiter that it adopted is 4-methyl acetophenone-O-1-(1 ' 3 ' 4-triazole) methylene radical oxime, and its add-on is 0.2g.
Claims (1)
1. the application of an oxadiazoles carbon steel restrainer, clean steel with the acid solution submergence that is added with inhibiter, it is characterized in that: the inhibiter composition is a triazole compound, described triazole compound is 4-methyl acetophenone-O-1-(1 ' 3 ' 4-triazole) methylene radical oxime 20g and 1-(4 '-N, N-dimethyl benzene time auxotox radical)-2-sulfydryl-5-[1 "-(1 " 3 " 4 "-triazole) methylene radical]-1,3, the combination of 4-triazole 20g, pickle solution is a dilute hydrochloric acid, concentration is 0.5mol/L, pickle solution consumption 100L is immersed in 4h in the pickle solution with steel to be cleaned at ambient temperature.
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| CN101245466B true CN101245466B (en) | 2011-01-19 |
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