CN105821421A - Composition used for corrosion inhibitor and application thereof and method for pickling equipment - Google Patents
Composition used for corrosion inhibitor and application thereof and method for pickling equipment Download PDFInfo
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- CN105821421A CN105821421A CN201510007054.5A CN201510007054A CN105821421A CN 105821421 A CN105821421 A CN 105821421A CN 201510007054 A CN201510007054 A CN 201510007054A CN 105821421 A CN105821421 A CN 105821421A
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Abstract
The invention discloses a composition used for a corrosion inhibitor and an application thereof and a method for pickling equipment. The composition used for the corrosion inhibitor contains a benzothiazolecorrosion inhibitor, thiocyanate, an alicyclic amine corrosion inhibitor, a carbamide type corrosion inhibitor, and a hydrazine-type corrosion inhibitor, and the weight ratio of the benzoheterocycle corrosion inhibitor to the thiocyanate to the alicyclic amine corrosion inhibitor to the carbamide type corrosion inhibitor to the hydrazine type corrosion inhibitor is 1:0.25-5:0.25-5:1.25-12:0.2-4. The method comprises a step of contacting an acid-washing liquid containing the corrosion inhibitor composition with a to-be pickled-part of the equipment. The composition used for the corrosion inhibitor accords with the environmental protection requirements, and is suitable for the pickling processes of more than ten inorganic acids or organic acids of hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid, sulfamic acid, citric acid, and hydroxy ethylidene diphosphonic acid, and is suitable for a plurality of metal materials of carbon steel, stainless steel, brass, red copper, and aluminum. The composition used for the corrosion inhibitor can effectively mitigate the corrosion problem on heat exchange equipment during a pickling process, and has excellent corrosion inhibition performance, addition amount is less, the processing steps are simple, effect is obvious, and the method has the advantages of easy popularization and application.
Description
Technical field
The invention belongs to technical field of fine, relate to a kind of corrosion inhibiter compositions and application thereof and the method that equipment is carried out pickling, specifically, relate to a kind of corrosion inhibiter compositions and the application in the pickling of equipment thereof, and utilize the method that this corrosion inhibiter compositions carries out pickling to equipment.
Background technology
Pickling is widely used in incrustation scale and the cleaning of metal dirt on the surfaces such as rolling mill scale and the oxide layer of heat transmission equipment, heat-transfer equipment, cooling device, iron and steel and other metal materials in each industrial department (such as electric power, petrochemical industry, metallurgy and electronics etc.).The heat power equipment (such as boiler) of power department and the pickling of chemical industry equipment are even more important.From the perspective of social economy, pickling can reduce the fuel brought because of dirt and expend；From the perspective of environmental conservation, decrease exhaust combustion gases and atmospheric pollution；From the view of security, the heat power equipment such as boiler and heat exchanger in use gradually forms all kinds of dirt, and these bad meetings of dirt heat conduction cause boiler tube local temperature to raise, reduce the intensity of steel, thus cause the generation of pipe explosion accident, affect boiler and heat transmission equipment runs, and the properly functioning of equipment can be ensured by pickling.
The acid that pickling is commonly used has mineral acid and the organic acid such as citric acid, EDTA such as hydrochloric acid, sulphuric acid, phosphoric acid, Fluohydric acid., sulfamic acid.But owing to hardware is all had the corrosion of corrosiveness, especially mineral acid even more serious by acid, the hydrogen released can spread to metal inside, makes the equipment generation hydrogen embrittlement being cleaned by simultaneously.It addition, a large amount of sour gas that pickling separates out are known from experience deteriorates labor condition.Therefore, the corrosion inhibiter to be added when pickling, to suppress metal burn in acid medium to reduce the usage amount of acid, improve pickling effect, the service life of prolongation heat power equipment.
First patent application of restrainer is that the mixture of Britain's announcement syrup in 1860 and vegetable oil is as corrosion inhibiter during pickling iron plate.To the twenties in 20th century, metal inhibitor has formaldehyde, anthracene, quinoline, pyridine, thiourea and derivant；The forties, nitrogenous fatty amine, aromatic amine, heterocyclic compound, thiourea and mercaptan generally use as restrainer；The fifties is organic inhibitor to the sixties；It it is the corrosion inhibiter of compounding composition after the seventies；Occur in that the eighties such as the salt acid inhibitor of benzimidazole rustless steel and carbon steel, copper inhibitor and the benzyl quaternary ammonium salt multiplex restrainer of solid etc..So far the restrainer developed the nineties mainly has imidazolines and Sulphur-containing Imidazole quinoline derivant, such as the salt acid inhibitor of copper, dehydrogenation rosin-base imidazoline corrosion inhibitor, SH-707, IS-156, BH-2 etc. such as SM-thiourea condensation substance, IS-129 imidazolines.Current domestic the most frequently used Lan-826 multipurpose restrainer can be used in multiple pickle, but this product is placed and is easily generated precipitation, unstable chemcial property, properties of product are caused easily to reduce, it addition, cleaning in cupric device procedures with Lan-826, copper facing phenomenon also can be produced.
CN101634030A discloses a kind of restrainer for cleaning boiler and using method thereof.The component of this restrainer and mass percentage content be: acid solution 2.0-10.0%, hexamethylenamine 0.08-0.25%, dimethylbenzene thiourea or thiourea 0.04-0.15%, rhodanate 0.01-0.05%, 12-cetyl Methoxybenzyl chloride or bromide 0.03-0.12%, surfactant 0.05-0.12%, surplus is water.
CN101608313A discloses various metals high-performance solid restrainer.If this solid pickling inhibitor is formed by Tianjin fourth, hexamethylenamine, thiourea, BTA crushing, stirring together with surfactant compound, its weight percentage is respectively as follows: 50-80%, 10-20%, 10-20%, 5-10%, 1-5%.Various metals or the alloys such as carbon steel, rustless steel, copper, zinc, aluminum, titanium can be suitable for.
[the corrosion and protection such as Zhao Liping, 2007,28 (10): 536-539] a kind of multiplex solid pickling inhibitor CM-911 is reported, the materials such as pickle and carbon steel, rustless steel, pyrite, red copper and aluminum such as nitric acid, hydrochloric acid, sulphuric acid, sulfamic acid, citric acid, oxalic acid, EDTA, hydroxyacetic acid, Fluohydric acid. can be used in.
Currently used restrainer great majority are to plant for single acid, the inhibition of single metal, and specificity is the strongest, difference on effect is big, and some unstable chemcial properties need situ configuration, working strength is big, easily causes operational error so that the risk that equipment corrosion accident occurs is bigger.
Summary of the invention
It is an object of the invention to overcome prior art not enough, it is provided that a kind of stable chemical nature, toxicity multiduty corrosion inhibiter compositions low, adaptable and application thereof and the method that equipment is carried out pickling.
To achieve these goals, on the one hand, the invention provides a kind of corrosion inhibiter compositions, this corrosion inhibiter compositions contains benzothiazole type corrosion inhibiter, rhodanate, alicyclic ring amine type corrosion inhibiter, urea type corrosion inhibiter and hydrazine type corrosion inhibiter, wherein, the weight ratio of described benzothiazole type corrosion inhibiter, rhodanate, alicyclic ring amine type corrosion inhibiter, urea type corrosion inhibiter and hydrazine type corrosion inhibiter is 1:0.25-5:0.25-5:1.25-12:0.2-4, preferably 1:0.5-2:0.5-2:2-5:0.4-1.5.
Another further aspect, the invention provides a kind of method that equipment is carried out pickling, and wherein, the method includes pickle and equipment being treated, pickling position contacts, and described pickle contains above-mentioned corrosion inhibiter compositions and acid.
On the other hand, the invention provides the application in the pickling of equipment of the above-mentioned corrosion inhibiter compositions.
Pass through technique scheme, each component in corrosion inhibiter compositions of the present invention can play a role the most synergistically, therefore, and the corrosion inhibiter of present invention compositions stable chemical nature, for eco-friendly multipurpose corrosion inhibiter compositions, meet the requirement of environmental protection；The corrosion inhibiter of present invention compositions can use in the acid cleaning process of 19 kinds of mineral acids or organic acid, and wide adaptability has excellent corrosion inhibition, and dosage is few, and processing procedure is simple and effect is obvious, it is easy to popularization and application.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Detailed description of the invention
Hereinafter the detailed description of the invention of the present invention is described in detail.It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains the present invention, it is not limited to the present invention.
The corrosion inhibiter compositions that the present invention provides contains benzothiazole type corrosion inhibiter, rhodanate, alicyclic ring amine type corrosion inhibiter, urea type corrosion inhibiter and hydrazine type corrosion inhibiter, described benzothiazole type corrosion inhibiter is 1:0.25-5 (preferably 1:0.5-2) with the weight ratio of rhodanate, described benzothiazole type corrosion inhibiter is 1:0.25-5 (preferably 1:0.5-2) with the weight ratio of alicyclic ring amine type corrosion inhibiter, described benzothiazole type corrosion inhibiter is 1:1.25-12 (preferably 1:2-5) with the weight ratio of urea type corrosion inhibiter, described benzothiazole type corrosion inhibiter is 1:0.2-4 (preferably 1:0.4-1.5) with the weight ratio of hydrazine type corrosion inhibiter.Wherein, described rhodanate can be identical or different with the amount of described alicyclic ring amine type corrosion inhibiter.
Wherein, described benzothiazole type corrosion inhibiter is the important composition composition in corrosion inhibiter compositions, can be the existing various benzothiazole with corrosion inhibitive function and/or its derivant.Under preferable case, described benzothiazole type corrosion inhibiter is 2-mercaptobenzothiazole and/or 2,2 '-di-mercaptobenzothiazolby.
According to the present invention, described rhodanate is the important composition composition in corrosion inhibiter compositions, can be the existing various water soluble thiocyanate with corrosion inhibitive function.Under preferable case, described rhodanate is at least one in sodium rhodanate, potassium thiocyanate and ammonium thiocyanate.It was found by the inventors of the present invention that currently preferred rhodanate and preferred benzothiazole type corrosion inhibiter have cooperative effect, it is possible to improve the corrosion inhibition of corrosion inhibiter compositions further.
According to the present invention, described alicyclic ring amine type corrosion inhibiter can be the existing various water solublity alicyclic ring amine substance (such as piperidines, morpholine, nafoxidine etc.) with corrosion inhibitive function, preferably, described alicyclic ring amine type corrosion inhibiter is hexamethylenetetramine and/or cyclohexylamine.
According to the present invention, described urea type corrosion inhibiter is the important component in corrosion inhibiter compositions, it can be the existing various water solublity urea or derivatives thereof with corrosion inhibitive function, preferably, described urea type corrosion inhibiter is selected from thiourea, N, N '-diethyl thiourea, N, N '-di-o-tolyl thiourea, N, N '-di-n-butyl thiourea, carbamide, semicarbazides, 1,3-diaminourea, 1, at least one in 3-diaminourea thiourea, thiosemicarbazides, dicyandiamidines and guanyl thiourea and their inorganic acid salt (example hydrochloric acid salt, sulfate or phosphate etc.).
According to the present invention, described hydrazine type corrosion inhibiter is the important component of corrosion inhibiter compositions, can be the existing various water solublity hydrazines with corrosion inhibitive function and/or its derivant.Preferably, at least one in hydrazine hydrate, Hydrazinium sulfate, hydrazine hydrochloride, carbonic acid hydrazine, carbohydrazide and phenylhydrazine of described hydrazine type corrosion inhibiter.
According to the present invention, described corrosion inhibiter compositions can also contain surfactant, and described surfactant can be anion surfactant, it is also possible to for nonionic surfactant, act primarily as wetting action.It is, for example possible to use alkyl or aryl sulphuric acid, sodium sulfonate, potassium sulfonate, ichthyodin, alkyl phosphate salt, alkyl carboxylate, alkyl sulfonyl amine salt, fatty alcohol-polyoxyethylene ether, alkanolamide etc..Commercially available kinds of surface activating agent (such as OP-10, OP-15, NP-10, NP-15, NP or CAS123-03-5 etc.) may be incorporated for the present invention and its consumption can use the conventional amount used of this area, does not repeats them here.
According to the present invention, described corrosion inhibiter compositions can be obtained by existing various methods, such as the raw material forming described corrosion inhibiter compositions can be prepared according to aforementioned ratio mix homogeneously, therefore the present invention to the step of described mixing and condition without particular/special requirement.
The method that equipment carries out pickling that the present invention provides includes pickle and equipment being treated, pickling position contacts, and described pickle contains above-mentioned corrosion inhibiter compositions and the acid of the present invention.
In the present invention, described equipment can be the various equipment needing pickling.Under preferable case, the material treating pickling position of described equipment is at least one in carbon steel, rustless steel, copper and alloy thereof, aluminum and alloy thereof.
In the present invention, the content of described corrosion inhibiter compositions can be the amount that this area is conventional, it is preferable that on the basis of the gross weight of described pickle, the consumption of described corrosion inhibiter compositions is 0.05-5 weight ‰.
In the present invention, to the particularly requirement of the consumption of described acid, and the consumption of acid can be selected, such as by those skilled in the art for the difference treating pickler, on the basis of the gross weight of described pickle, the consumption of described acid typically 2-10 weight %.
In the present invention, described acid can be the various mineral acid being suitable to pickling and/or organic acid.
Described mineral acid is preferably selected from least one in hydrochloric acid, sulphuric acid, nitric acid, Fluohydric acid. and phosphoric acid.
Described organic acid is preferably selected from sulfamic acid, citric acid, hydroxyacetic acid, formic acid, ethylenediaminetetraacetic acid, oxalic acid, tartaric acid, hydroxy ethylene diphosphonic acid, ATMP, 2-phosphinylidyne butane-1; at least one in 2,4-tricarboxylic acids and ethylenediamine tetramethylene phosphonic acid.
Present invention also offers the application in the pickling of equipment of the above-mentioned corrosion inhibiter compositions.Described equipment can be the various equipment needing pickling.Under preferable case, the material treating pickling position of described equipment is at least one in carbon steel, rustless steel, copper and alloy thereof, aluminum and alloy thereof.
Hereinafter will be described the present invention by embodiment.Embodiment 1-10 is used for corrosion inhibiter compositions and preparation method thereof is described.In embodiment and comparative example, agents useful for same is as follows: hydrochloric acid, sulphuric acid, nitric acid, Fluohydric acid., phosphoric acid, hydroxyacetic acid, formic acid are analytical pure (being purchased from Beijing Chemical Plant)；Sodium lauryl sulphate, dodecylbenzene sodium sulfonate, sodium rhodanate, potassium thiocyanate, ammonium thiocyanate, 2-mercaptobenzothiazole, 2, 2 '-di-mercaptobenzothiazolby, N, N '-diethyl thiourea, N, N '-di-o-tolyl thiourea, N, N '-di-n-butyl thiourea, carbamide, semicarbazide hydrochloride, 1, 3-diaminourea hydrochlorate, 1, 3-diaminourea thiourea, thiosemicarbazides, dicyandiamidines, guanyl thiourea, sulfamic acid, citric acid, ethylenediaminetetraacetic acid, oxalic acid, tartaric acid, piperidines, hydrazine hydrate, Hydrazinium sulfate, hydrazine hydrochloride, carbonic acid hydrazine, carbohydrazide, phenylhydrazine is analytical pure (being purchased from Chemical Reagent Co., Ltd., Sinopharm Group)；Hydroxy ethylene phosphonic acids, ATMP, 2-phosphono-1,2,4-tricarboxylic acids, ethylenediamine tetramethylene phosphonic acid (being purchased from Jianghai Environmental Protection Co., Ltd.)；The multiplex restrainer of Lan-826 (cleans limited company purchased from blue star), the multiplex solid pickling inhibitor of CM-911 (purchased from Weihai Yun Qing chemical development institute).
Embodiment 1
Weigh the 2-mercaptobenzothiazole of 1.0g, 0.5g sodium rhodanate, 2.0g hexamethylenetetramine, the 1 of 3.0g, 3-diaminourea thiourea, 2.0g carbamide, 1.5g Hydrazinium sulfate, finally stir.
Embodiment 2
Weigh the 2 of 1.0g, 2-di-mercaptobenzothiazolby, 2.0g ammonium thiocyanate, 0.5g hexamethylenetetramine, 2.0g thiourea, 0.4g phenylhydrazine, 0.02g sodium lauryl sulphate, finally stir.
Embodiment 3
Weigh the 2-mercaptobenzothiazole of 1.0g, 1.5g potassium thiocyanate, 1.2g hexamethylenetetramine, the 1 of 2.0g, 3-diaminourea hydrochlorate, 1.5g thiosemicarbazides, 1.0g carbohydrazide, 0.01g dodecylbenzene sodium sulfonate, finally stir.
Embodiment 4
Weigh the 2-mercaptobenzothiazole of 1.0g, 0.25g sodium rhodanate, 5.0g hexamethylenetetramine, 1.0g dicyandiamidines, the N of 0.25g, N '-diethyl thiourea, 0.2g hydrazine hydrochloride, finally stir.
Embodiment 5
Weigh the 2-mercaptobenzothiazole of 1.0g, 5.0g sodium rhodanate, 0.25g hexamethylenetetramine, the N of 2.0g, N '-di-o-tolyl thiourea, 2.0g semicarbazide hydrochloride, 2.0g thiosemicarbazides, 2.0g carbamide, 4.0g guanyl thiourea, 4.0g hydrazine hydrate, finally stir.
Embodiment 6
Weigh the 2-mercaptobenzothiazole of 1.0g, 3.5g sodium rhodanate, 4.0g hexamethylenetetramine, 2.0g semicarbazide hydrochloride, the 1 of 2.0g, 3-diaminourea thiourea, the N of 4.0g, N '-di-n-butyl thiourea, 0.3g phenylhydrazine, finally stir.
Embodiment 7
Weigh the 2-mercaptobenzothiazole of 0.5g, the 2 of 0.5g, 2-di-mercaptobenzothiazolby, 0.25g ammonium thiocyanate, 3.0g hexamethylenetetramine, 4.0g thiosemicarbazides, 4.0g carbamide, 2.5g Hydrazinium sulfate, finally stir.
Embodiment 8
Weigh the 2-mercaptobenzothiazole of 10.0g, 4.0g sodium rhodanate, 30.0g hexamethylenetetramine, 10.0g carbamide, 5.0g thiourea, 10.0g carbohydrazide, finally stir.
Embodiment 9
Weigh the 2-mercaptobenzothiazole of 1.0g, 3.5g sodium rhodanate, 0.4g hexamethylenetetramine, 1.5g semicarbazides, 2.0g hydrazine hydrochloride, finally stir.
Embodiment 10
Weigh the 2-mercaptobenzothiazole of 1.0g, 5.0g sodium rhodanate, 5.0g hexamethylenetetramine, 2.0g semicarbazide hydrochloride, 1.0g thiosemicarbazides, 2.5g phenylhydrazine, finally stir.
Embodiment 11
Corrosion inhibiter compositions is prepared, except for the difference that, with " piperidines " replacement " hexamethylenetetramine " according to embodiment 1.
Comparative example 1
Corrosion inhibiter compositions is prepared according to the embodiment 2 of CN101634030A.
Comparative example 2
Corrosion inhibiter compositions is prepared according to the embodiment 6 of CN101634030A.
Comparative example 3
Using Lan-826 as corrosion inhibiter compositions, according to the description of product of the multiplex restrainer of Lan-826, consumption is the 0.25% of pickle quality.
Comparative example 4
Using CM-911 as corrosion inhibiter compositions, according to the description of product of the multiplex solid pickling inhibitor of CM-911, consumption is the 0.1% of pickle quality.
Comparative example 5
Corrosion inhibiter compositions is prepared according to the embodiment 1 of CN101608313A.
Comparative example 6
Preparing corrosion inhibiter compositions according to embodiment 1, except for the difference that, the consumption of sodium rhodanate is 0.1g, and the consumption of hexamethylenetetramine is 2.3g.
Test case 1
According to DL/T523-2007 " Chemical cleaning corrosion inhibiter Performance Properties Evaluation index and experimental technique " and GB/T25146-2010 " industrial equipment Chemical cleaning inspection of quality specification ", respectively the corrosion inhibition of the corrosion inhibiter compositions of embodiment 1-11 and comparative example 1-6 gained is evaluated, wherein, corrosion rate is the lowest, illustrates that the corrosion inhibition of corrosion inhibiter compositions is the highest.
In table 1, "-" represents the corrosion inhibiter compositions corrosion rate (static etch rate) in this pickle that undetermined prepares.
Table 1
Can be seen that from the evaluation experimental result of table 1, the corrosion inhibiter compositions of the present invention has good corrosion inhibition, add the pickle after the corrosion inhibiter compositions of the present invention, corrosion rate is all much smaller than corrosion rate < 1.5g/ (m2 h), the corrosion rate < 1.0g/ (m of Fluohydric acid. corrosion inhibiter of the salt acid inhibitor of regulation in DL/T523-2007 " Chemical cleaning corrosion inhibiter Performance Properties Evaluation index and experimental technique "2H), the corrosion rate < 1.5g/ (m of EDTA corrosion inhibiter2H), the corrosion rate < 1.0g/ (m of sulfamic acid corrosion inhibiter2H), the corrosion rate < 1.0g/ (m of citric acid corrosion inhibiter2H), the corrosion rate < 0.3g/ (m of copper inhibitor2H) requirement, is respectively less than the corrosion of carbon steel speed≤2.0g/ (m of regulation in GB/T25146-2010 " industrial equipment Chemical cleaning inspection of quality specification " to the corrosion rate of unlike material2H), Corrosion of Stainless Steel speed≤1.0g/ (m2H), brass corrosion speed≤< 1.0g/ (m2H), red copper corrosion rate≤1.0g/ (m2H), aluminum corrosion rate≤1.0g/ (m2H), therefore, the present invention corrosion inhibiter compositions can meet the inhibition requirement of various metals material pickling.
From the above it can also be seen that the corrosion inhibiter compositions concentration of the present invention is low, have only to when processing pickle add the 0.05-5 weight ‰ relative to pickle gross weight, just can obtain good corrosion inhibition.
Additionally, the measurement result of comparing embodiment 1-11 and comparative example 1-5 is it can be seen that the corrosion inhibiter compositions of the present invention shows the most excellent corrosion mitigating effect than existing corrosion inhibiter compositions.Embodiment 1 is compared with the measurement result of comparative example 6 it can be seen that the present invention corrosion inhibiter compositions each composition with specified quantitative with the use of time can play collaborative corrosion inhibition.
The preferred embodiment of the present invention described in detail above; but, the present invention is not limited to the detail in above-mentioned embodiment, in the technology concept of the present invention; technical scheme can be carried out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that, each concrete technical characteristic described in above-mentioned detailed description of the invention, in the case of reconcilable, can be combined by any suitable means, in order to avoid unnecessary repetition, various possible compound modes are illustrated by the present invention the most separately.
Additionally, can also carry out combination in any between the various different embodiment of the present invention, as long as it is without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (12)
1. a corrosion inhibiter compositions, it is characterized in that, this corrosion inhibiter compositions contains benzothiazole type corrosion inhibiter, rhodanate, alicyclic ring amine type corrosion inhibiter, urea type corrosion inhibiter and hydrazine type corrosion inhibiter, wherein, the weight ratio of described benzothiazole type corrosion inhibiter, rhodanate, alicyclic ring amine type corrosion inhibiter, urea type corrosion inhibiter and hydrazine type corrosion inhibiter is 1:0.25-5:0.25-5:1.25-12:0.2-4, preferably 1:0.5-2:0.5-2:2-5:0.4-1.5.
Corrosion inhibiter compositions the most according to claim 1, wherein, described benzothiazole type corrosion inhibiter is 2-mercaptobenzothiazole and/or 2,2 '-di-mercaptobenzothiazolby.
Corrosion inhibiter compositions the most according to claim 1 and 2, wherein, at least one in sodium rhodanate, potassium thiocyanate and ammonium thiocyanate of described rhodanate.
4. according to the corrosion inhibiter compositions described in any one in claim 1-3, wherein, described alicyclic ring amine type corrosion inhibiter is hexamethylenetetramine and/or cyclohexylamine.
5. according to the corrosion inhibiter compositions described in any one in claim 1-4, wherein, described urea type corrosion inhibiter is selected from thiourea, N, N '-diethyl thiourea, N, N '-di-o-tolyl thiourea, N, N '-di-n-butyl thiourea, carbamide, semicarbazides, 1,3-diaminourea, 1, at least one in 3-diaminourea thiourea, thiosemicarbazides, dicyandiamidines, guanyl thiourea and their inorganic acid salt.
6. according to the corrosion inhibiter compositions described in any one in claim 1-5, wherein, at least one in hydrazine hydrate, Hydrazinium sulfate, hydrazine hydrochloride, carbonic acid hydrazine, carbohydrazide and phenylhydrazine of described hydrazine type corrosion inhibiter.
7. the method that equipment is carried out pickling, it is characterised in that the method includes pickle and equipment being treated, pickling position contacts, described pickle contains in claim 1-6 the corrosion inhibiter compositions described in any one and acid.
Method the most according to claim 7, wherein, on the basis of the gross weight of described pickle, the consumption of described corrosion inhibiter compositions is 0.05-5 weight ‰.
9. according to the method described in claim 7 or 8; wherein; described acid is hydrochloric acid, sulphuric acid, nitric acid, Fluohydric acid., phosphoric acid, sulfamic acid, citric acid, hydroxyacetic acid, formic acid, ethylenediaminetetraacetic acid, oxalic acid, tartaric acid, hydroxy ethylene diphosphonic acid, ATMP, 2-phosphinylidyne butane-1; at least one in 2,4-tricarboxylic acids and ethylenediamine tetramethylene phosphonic acid.
Method the most according to claim 7, wherein, the material treating pickling position of described equipment is at least one in carbon steel, rustless steel, copper and alloy thereof, aluminum and alloy thereof.
Corrosion inhibiter compositions described in any one application in the pickling of equipment in 11. claim 1-6.
12. application according to claim 11, wherein, the material treating pickling position of described equipment is at least one in carbon steel, rustless steel, copper and alloy thereof, aluminum and alloy thereof.
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| CN107761113A (en) * | 2017-10-17 | 2018-03-06 | 爱环吴世（苏州）环保股份有限公司 | The preparation method of copper heat exchanger acid cleaning corrosion inhibiter |
| CN108385115A (en) * | 2018-03-21 | 2018-08-10 | 山西欧迅电力建设有限公司 | A kind of indirect cool tower scavenger specially and preparation method thereof |
| CN108728853A (en) * | 2017-04-14 | 2018-11-02 | 上海济环水处理科技有限公司 | A kind of galvanized pipe restrainer and its application |
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