CN101555600A - Carbon steel pickling corrosion inhibitor for ethanone type heterocyclic organisms and application thereof - Google Patents

Abstract

The invention relates to a steel (carbon steel) pickling corrosion inhibitor, in particular to a carbon steel pickling corrosion inhibitor for ethanone type heterocyclic organisms and an application thereof. The corrosion inhibitor comprises 1-[2-4 '-nitrobenzene-5-(1,2,4-triazole)-methyl-(1,3,4-oxadiazole)]-ethanone or 1-(4-anisole)-2-[5- (1,2,4-triazole)-methyl-(1,2,4-triazole)-3-sulfenyl]-ethanone or the combination thereof. The corrosion inhibitor can effectively avoid the corrosion of acid to the carbon steel in the pickling process and has the outstanding advantages of low consumption, high corrosion inhibition efficiency and stable corrosion inhibition performance. The product has no pollution to the environment and has broad market prospect.

Description

A kind of carbon steel pickling corrosion inhibitor for ethanone type heterocyclic organisms and application thereof

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 efficient carbon steel pickling corrosion inhibitor of a kind of ethyl ketone class 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 efficient carbon steel pickling corrosion inhibitor of ethyl ketone class and the application thereof of environmental protection.

For achieving the above object, the technical solution used in the present invention is:

A kind of carbon steel pickling corrosion inhibitor for ethanone type heterocyclic organisms, described inhibiter composition is 1-{2-4 '-oil of mirbane-5-(1,2, the 4-triazole)-methyl-(1,3, the 4-oxadiazole) }-ethyl ketone, 1-(4-anisole)-2-{5-(1,2, the 4-triazole)-methyl-(1,2, the 4-triazole)-3-sulfenyl }-one or both combination of ethyl ketone; Portfolio ratio can be any ratio.

When described inhibiter was the combination of two kinds of ethyl ketone class heterocyclic organic compounds, by weight better compound proportion was between them: (1-100): (1-100);

The application of described carbon steel pickling corrosion inhibitor for ethanone type heterocyclic organisms is: clean steel with the pickle solution submergence that is added with ethyl ketone class inhibiter; Pickle 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 1-4h; ,

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: the ethyl ketone class inhibiter that the present invention relates to is the compound with three nitrogen heterocycles, this compound 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 invention has the beneficial effects as follows:,

1. cost is low.Inhibiter of the present invention is ethyl ketone compounds 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 the ethyl ketone compounds, 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 1-{2-4 '-oil of mirbane-5-(1,2, the 4-triazole)-methyl-(1,3, the 4-oxadiazole) }-ethyl ketone 30g, at ambient temperature steel to be cleaned are immersed in 4h in the pickle solution.

The highest inhibition efficiency that obtains by experimental test is 96%, is shown as inhibiter efficiently.

Embodiment 2

Pickle solution is a dilute hydrochloric acid, and concentration is 0.5M, pickle solution consumption 100L, add 1-{2-4 '-oil of mirbane-5-(1,2, the 4-triazole)-methyl-(1,3, the 4-oxadiazole) }-ethyl ketone 20g and 1-(4-anisole)-2-{5-(1,2, the 4-triazole)-methyl-(1,2, the 4-triazole)-the 3-sulfenyl }-ethyl ketone 20g, at ambient temperature steel to be cleaned are immersed in submergence 4h in the pickle solution.

The highest inhibition efficiency that obtains by experimental test is 98%, is shown as inhibiter efficiently.

Embodiment 3

Pickle solution is a dilute hydrochloric acid, and concentration is 1M, pickle solution consumption 100L, add 1-(4-anisole)-2-{5-(1,2, the 4-triazole)-methyl-(1,2,4-triazole)-the 3-sulfenyl }-ethyl ketone 40g, at ambient temperature steel to be cleaned are immersed in that submergence 4h gets final product in the pickle solution.

The highest inhibition efficiency that obtains by experimental test is 95%, is shown as inhibiter efficiently.

Embodiment 4

Pickle solution is a dilute hydrochloric acid, and concentration is 1M, pickle solution consumption 100L, add 1-{2-4 '-oil of mirbane-5-(1,2, the 4-triazole)-methyl-(1,3, the 4-oxadiazole) }-ethyl ketone 20g and 1-(4-anisole)-2-{5-(1,2, the 4-triazole)-methyl-(1,2, the 4-triazole)-the 3-sulfenyl }-ethyl ketone 20g, at ambient temperature steel to be cleaned are immersed in that submergence 4h gets final product in the pickle solution.

The highest inhibition efficiency that obtains by experimental test is 97%, 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 1-{2-4 '-oil of mirbane-5-(1,2, the 4-triazole)-methyl-(1,3, the 4-oxadiazole) }-ethyl ketone 35g, at ambient temperature steel to be cleaned are immersed in 4h in the pickle solution.

The highest inhibition efficiency that obtains by experimental test is 95%, is shown as inhibiter efficiently.

Embodiment 6

Pickle solution is a dilute hydrochloric acid, and concentration is 0.8M, pickle solution consumption 100L, add 1-{2-4 '-oil of mirbane-5-(1,2, the 4-triazole)-methyl-(1,3, the 4-oxadiazole) }-ethyl ketone 20g and 1-(4-anisole)-2-{5-(1,2, the 4-triazole)-methyl-(1,2, the 4-triazole)-the 3-sulfenyl }-ethyl ketone 20g, at ambient temperature steel to be cleaned are immersed in submergence 4h in the pickle solution.

The highest inhibition efficiency that obtains by experimental test is 98%, is shown as inhibiter efficiently.

Embodiment 7

Pickle solution is a dilute sulphuric acid, and concentration is 0.1M, pickle solution consumption 100L, add 1-(4-anisole)-2-{5-(1,2, the 4-triazole)-methyl-(1,2,4-triazole)-the 3-sulfenyl }-ethyl ketone 15g, at ambient temperature steel to be cleaned are immersed in that submergence 3h gets final product in the pickle solution.

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, and concentration is 0.1M, pickle solution consumption 100L, add 1-{2-4 '-oil of mirbane-5-(1,2, the 4-triazole)-methyl-(1,3, the 4-oxadiazole) }-ethyl ketone 20g and 1-(4-anisole)-2-{5-(1,2, the 4-triazole)-methyl-(1,2, the 4-triazole)-the 3-sulfenyl }-ethyl ketone 15g, at ambient temperature steel to be cleaned are 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 9

Pickle solution is a dilute sulphuric acid, and concentration is 0.1M, pickle solution consumption 100L, add 1-{2-4 '-oil of mirbane-5-(1,2, the 4-triazole)-methyl-(1,3,4-oxadiazole) }-and ethyl ketone 20g, at ambient temperature steel to be cleaned are immersed in that submergence 3h gets final product in the pickle solution.

The highest inhibition efficiency that obtains by experimental test is 96%, is shown as inhibiter efficiently.

Embodiment 10

Pickle solution is a dilute sulphuric acid, and concentration is 0.5M, pickle solution consumption 100L, add 1-{2-4 '-oil of mirbane-5-(1,2, the 4-triazole)-methyl-(1,3,4-oxadiazole) }-and ethyl ketone 35g, at ambient temperature steel to be cleaned are immersed in that submergence 3h gets final product in the pickle solution.

The highest inhibition efficiency that obtains by experimental test is 99%, is shown as inhibiter efficiently.

Embodiment 11

Pickle solution is a dilute sulphuric acid, and concentration is 0.5M, pickle solution consumption 100L, add 1-{2-4 '-oil of mirbane-5-(1,2, the 4-triazole)-methyl-(1,3, the 4-oxadiazole) }-ethyl ketone 20g and 1-(4-anisole)-2-{5-(1,2, the 4-triazole)-methyl-(1,2, the 4-triazole)-the 3-sulfenyl }-ethyl ketone 20g, at ambient temperature steel to be cleaned are immersed in that submergence 3h gets final product in the pickle solution.

The highest inhibition efficiency that obtains by experimental test is 99%, is shown as inhibiter efficiently.

Corrosion inhibiter of the present invention can effectively prevent in acid cleaning process acid to the corrosion of carbon steel, have consumption low, Inhibition efficiency height, the stable outstanding advantages of corrosion inhibition. Product environmentally safe of the present invention has Wide market prospects.

Claims (5)

1, a kind of carbon steel pickling corrosion inhibitor for ethanone type heterocyclic organisms, it is characterized in that: the effective constituent of described inhibiter is 1-{2-4 '-oil of mirbane-5-(1,2, the 4-triazole)-methyl-(1,3, the 4-oxadiazole) }-ethyl ketone, 1-(4-anisole)-2-{5-(1,2, the 4-triazole)-methyl-(1,2, the 4-triazole)-3-sulfenyl }-one or both combination of ethyl ketone.

2. according to the described carbon steel pickling corrosion inhibitor for ethanone type heterocyclic organisms of claim 1, it is characterized in that:

When described inhibiter was the combination of two kinds of ethyl ketone compounds, by weight compound proportion was between them: (1-100): (1-100).

3. the application of the described carbon steel pickling corrosion inhibitor of claim 1, it is characterized in that: described inhibiter is used to clean steel, the effective constituent of described inhibiter is 1-{2-4 '-oil of mirbane-5-(1,2, the 4-triazole)-methyl-(1,3, the 4-oxadiazole) }-ethyl ketone, 1-(4-anisole)-2-{5-(1,2, the 4-triazole)-methyl-(1,2,4-triazole)-the 3-sulfenyl }-one or both combination of ethyl ketone.

4. according to the application of the described carbon steel pickling corrosion inhibitor of claim 3, it is characterized in that:

When described inhibiter was the combination of two kinds of ethyl ketone compounds, by weight compound proportion was between them: (1-100): (1-100);

5. according to the application of the described ethyl ketone carbon steel restrainer of claim 3, it is characterized in that: clean steel with the pickle solution submergence that is added with ethyl ketone class inhibiter, pickle solution is an acid solution, and the amount that adds inhibiter in every liter of acid solution is 0.001g-2.0g, the submergence temperature is a room temperature, and the time is 1-4h;

Wherein: acid solution is dilute hydrochloric acid or dilute sulphuric acid, and concentration is 0.1mol/L-1mol/L.