CN104775126B - A kind of 1,2 2 (sulfenyl of the benzimidazole 2) applications of ethane in metal pickle liquor is prepared - Google Patents
A kind of 1,2 2 (sulfenyl of the benzimidazole 2) applications of ethane in metal pickle liquor is prepared Download PDFInfo
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Abstract
The invention discloses a kind of 1,2 two (sulfenyl of the benzimidazole 2) applications of ethane in metal pickle liquor is prepared, 1,2 two (sulfenyl of benzimidazole 2) ethane are added into the inorganic pickling medium of various concentrations, it is 1 × 10 to make its concentration‑5~1×10‑3Mol/L, purpose is that solve people increasingly improves for the requirement that corrosion inhibiter is acted on, and the problem of the corrosion inhibiter species famine of satisfaction requirement, 1, the preparation method of 2 two (sulfenyl of benzimidazole 2) ethane is simple, low production cost, possesses good corrosion inhibition for metal effect, and with the features such as consumption is few, compatibility is good, can be with almost all of inorganic pickling media compatibility, and inhibition efficiency is influenceed smaller by time, acidity etc., available for various metals pickling, have a wide range of application, while the present invention is also 1,2 two（The sulfenyl of benzimidazole 2）Ethane has expanded new application field.
Description
Technical field
The present invention relates to pickling of metal corrosion and protection field, especially one kind 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) second
Application of the alkane in metal pickle liquor is prepared.
Background technology
Corrosion is the important destructive factor in modern industry and life, wherein being made with metal erosion to modern industry and life
Into loss it is the most serious.It is estimated that direct economic loss of the China caused by steel corrosion accounts for the 3- of gross national product
4%.In the technique of chemical pickling hardware and component, pickle is in dissolving metal oxide (such as iron rust, oxide skin
Deng) while, metallic matrix can also corroded and causes the hydrogen embrittlement of hardware to corrode, the huge waste of metals resources is caused.
Corrosion inhibiter is added into pickle, metal erosion can be effectively reduced, is a kind of work protected metal material and equipment
Skill is easy, with low cost, strong applicability method.The corrosion inhibiter requirement used in chemical pickling does not reduce cleaning speed and matter
Amount, does not result in the local corrosion of metal, high in the fast coverage rate of hardware adsorption, can bear acid washing conditions change and
Corrosion inhibition can not decline with time lengthening.
All the time, it is more applied to the pickle in life and production, in acid cleaning process, the mass concentration one of pickle
As be less than 20%, the mainly organic matter of its corrosion inhibition of its inhibiting solution.But meanwhile, there is inhibition effect in existing organic inhibitor
Rate is low, the problems such as toxicity of part corrosion inhibiter is larger, production cost is high, application is narrow.It is now widely used for pickle
Corrosion mitigating effect of the amine inhibitor in the case of one-component it is general, generally require and compounded, and amine inhibition mostly
Agent has penetrating odor；Pyridine derivate has penetrating odor mostly；Imidazolidine derivatives class corrosion inhibiter is without special thorn
Sharp property smell, heat endurance are good, toxicity is low, but need multistep to synthesize, and synthesis technique is complicated；Thiourea process
Inhibition efficiency is big by structure influence, and the concentration of corrosion inhibiter has optimized scope, and application is narrow；The application of natural rosin
Poor-performing, generally need to could be used as corrosion inhibiter by modified.
The problem of existing for existing corrosion inhibiter, applicant has synthesized a kind of benzimidazole corrosion inhibiter --- and 1,2- bis-
(benzimidazolyl-2 radicals-sulfenyl) ethane, its rust inhibition is far above the 2-mercaptobenzimidazole under the same terms；Concentration is 5 at 30 DEG C
×10-4The 1mol/L sulfuric acid pickling solutions of mol/L 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane reach to the corrosion inhibition rate in Q235 steel
To 99.47%.
People increasingly improve for corrosion inhibiter requirement, and meet the species famine for requiring corrosion inhibiter.Therefore, compel to be essential
New corrosion inhibiter is opened, to meet demand of the people for corrosion inhibiter, while metal erosion when effectively reducing pickling of metal,
Reduce economic loss.Applicant has also synthesized the (benzene of 1,3- bis- while 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane is synthesized
And imidazoles -2- sulfenyls) propane and Isosorbide-5-Nitrae-two (benzimidazolyl-2 radicals-sulfenyl) butane, their corrosion inhibition is tested, them are found
Equally there is good corrosion mitigating effect to pickling of metal.
The content of the invention
The goal of the invention of the present invention is：Increasingly improved for the requirement that corrosion inhibiter is acted on for people, and meet and require
Corrosion inhibiter species famine the problem of there is provided one kind 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane in metal pickle liquor
Application.The metal pickle liquor prepared using the present invention has good corrosion inhibition for metal effect, and with preferable compatibility, energy
Enough and almost all of inorganic pickling media compatibility, and inhibition efficiency is influenceed smaller by time, acidity etc., available for a variety of gold
Belong to pickling, have a wide range of application, while the present invention has also expanded new application neck for 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane
Domain.
To achieve these goals, the present invention is adopted the following technical scheme that：
The structural formula of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane is as follows：
1,2- bis- application of (benzimidazolyl-2 radicals-sulfenyl) ethane in metal pickle liquor is prepared, to the inorganic of various concentrations
1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane is added in pickling medium, it is 1 × 10 to make its concentration-5~1 × 10-3Mol/L, as
It is preferred that, concentration is 1 × 10-4~1 × 10-3Mol/L, most preferable concentrations are 1 × 10-4~5 × 10-4Mol/L, wherein, 1,2- bis-
(benzimidazolyl-2 radicals-sulfenyl) ethane makees restrainer in pickle.
The inorganic acid is hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, the one or more of carbonic acid.
Based on use above, a kind of metal pickle liquor can be prepared, includes the pickling medium and 1,2- bis- of various various concentrations
(benzimidazolyl-2 radicals-sulfenyl) ethane, 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane works as restrainer, preferably
It is 1 × 10 to add 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration-5~1 × 10-3mol/L。
For it is existing disclosure satisfy that people require corrosion inhibiter species famine the problem of, the application provide one kind 1,2-
Two applications of (benzimidazolyl-2 radicals-sulfenyl) ethane in metal pickle liquor is prepared.1,2- bis- that the present invention is provided (benzimidazole-
2- sulfenyls) ethane, in metal pickle liquor, with, corrosion mitigating effect high advantage good with metal pickle liquor media compatibility.Hair
A person of good sense is proved by lot of experiments, and 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane is added into hydrochloric acid, sulphur by certain concentration
In the pickling mediums such as acid, effective corrosion inhibition for metal effect can be obtained, wherein, 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane is added
Enter into the inorganic pickling medium of various concentrations, the concentration of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane is 1 × 10-5~1 ×
10-3mol/L；Preferably, its concentration is 1 × 10-4~1 × 10-3mol/L；Most preferably, its concentration is 1 × 10-4~5 × 10- 4mol/L。
Inventor is by the way that experimental results demonstrate 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane and almost all of inorganic acid
Washing medium all has preferable compatibility, and corrosion inhibiter of the invention can be used in various metals pickling, with wider application model
Enclose.(benzimidazolyl-2 radicals-sulfenyl) ethane of 1,2- bis- is added to the pickling of metal medium of various various concentrations according to the concentration
In obtained metal pickle liquor, with good corrosion inhibition for metal effect, and its inhibition efficiency by time, acidity etc. influenceed compared with
It is small.
The present invention provides the preparation method of one kind 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane simultaneously, and its raw material is inexpensively easy
, preparation method is simple, and production cost is low, is applied to and prepares metal pickle liquor, have the advantages that it is with low cost, suitable for work
Industry popularization and application.Meanwhile, the present invention has also expanded a kind of new application field for 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane.
Brief description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
During Fig. 1 is embodiment 1, temperature is 30 DEG C, in 1mol/L HCl pickles, 1,2- bis- (benzimidazolyl-2 radicals-sulphur
Base) ethane concentration and corrosion inhibition rate graph of a relation.
During Fig. 2 is embodiment 2, temperature is 30 DEG C, in 1mol/L H2SO4In pickle, 1,2- bis- (benzimidazolyl-2 radicals-sulphur
Base) ethane concentration and corrosion inhibition rate graph of a relation.
During Fig. 3 is embodiment 3, temperature is 30 DEG C, in 1mol/L H3PO4In pickle, 1,2- bis- (benzimidazolyl-2 radicals-sulphur
Base) ethane concentration and corrosion inhibition rate graph of a relation.
During Fig. 4 is embodiment 4, in 1mol/L HCl pickles, 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration is
5×10-4During mol/L, the graph of a relation of corrosion inhibition rate and temperature.
During Fig. 5 is embodiment 5, in 1mol/L H2SO4In pickle, 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration
For 5 × 10-4During mol/L, the graph of a relation of corrosion inhibition rate and temperature.
During Fig. 6 is embodiment 6, in 1mol/L H3PO4In pickle, 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration
For 5 × 10-4During mol/L, the graph of a relation of corrosion inhibition rate and temperature.
During Fig. 7 is embodiment 7, in 1mol/L HCl pickles, 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration is
5×10-4During mol/L, the graph of a relation of corrosion inhibition rate and time of repose.
During Fig. 8 is embodiment 8, in 1mol/L H2SO4In pickle, 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration
For 5 × 10-4During mol/L, the graph of a relation of corrosion inhibition rate and time of repose.
During Fig. 9 is embodiment 9, in 1mol/L H3PO4In pickle, 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration
For 5 × 10-4During mol/L, the graph of a relation of corrosion inhibition rate and time of repose.
Embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, can combine in any way.
Any feature disclosed in this specification, unless specifically stated otherwise, can be equivalent by other or with similar purpose
Alternative features are replaced.I.e., unless specifically stated otherwise, each feature is an example in a series of equivalent or similar characteristics
.
The foregoing invention content of the present invention is described in further detail with reference to embodiment.
Embodiment 1
The present embodiment is the different shadows to hydrochloric acid pickler corrosion inhibition rate of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration
Ring.
The present embodiment adds the (benzos of 1,2- bis- in the case of concentration of hydrochloric acid identical (1mol/L, molar concentration, similarly hereinafter)
Imidazoles -2- sulfenyls) ethane, the concentration for making 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane is 1 × 10-5~1 × 10-3mol/L.
30 DEG C, Q235 steel pickling is respectively used to, the corrosion inhibition rate of each pickle is determined, as a result as shown in table 1.And with (the benzo miaows of 1,2- bis-
Azoles -2- sulfenyls) ethane concentration C (mol/L) be abscissa, corrosion inhibition rate IE (%) be ordinate, obtain in 1mol/L chlorohydric acid picklings
In liquid, the graph of a relation of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration and corrosion inhibition rate, as shown in Figure 1.
Influences of (benzimidazolyl-2 radicals-sulfenyl) ethane concentration to hydrochloric acid pickler corrosion inhibition rate of 1 1,2- of table bis-
According to the above results, 1 × 10-5~1 × 10-3In mol/L concentration ranges, hydrochloric acid pickler corrosion inhibition rate with 1,
The increase of 2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration and raise, when 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration is super
Cross 5 × 10-4After mol/L, corrosion inhibition rate change is little.
Embodiment 2
The present embodiment is the different shadows to sulfuric acid pickling solution corrosion inhibition rate of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration
Ring.
The present embodiment adds the (benzos of 1,2- bis- in the case of sulfuric acid concentration identical (1mol/L, molar concentration, similarly hereinafter)
Imidazoles -2- sulfenyls) ethane, the concentration for making 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane is 1 × 10-5~1 × 10-3mol/L.
30 DEG C, Q235 steel pickling is respectively used to, the corrosion inhibition rate of each pickle is determined, as a result as shown in table 2.And with (the benzo miaows of 1,2- bis-
Azoles -2- sulfenyls) ethane concentration C (mol/L) be abscissa, corrosion inhibition rate IE (%) be ordinate, obtain in 1mol/L sulfuric acid washings
In liquid, the graph of a relation of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) concentration and corrosion inhibition rate, as shown in Figure 2.
Influences of (benzimidazolyl-2 radicals-sulfenyl) ethane concentration to sulfuric acid pickling solution corrosion inhibition rate of 2 1,2- of table bis-
According to the above results, 1 × 10-5~1 × 10-3In mol/L concentration ranges, sulfuric acid pickling solution corrosion inhibition rate with 1,
The increase of 2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration and raise, when 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration is super
Cross 5 × 10-4After mol/L, corrosion inhibition rate change is little.
Embodiment 3
The present embodiment is the different shadows to phosphoric acid pickle corrosion inhibition rate of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration
Ring.
The present embodiment adds the (benzos of 1,2- bis- in the case of phosphoric acid concentration identical (1mol/L, molar concentration, similarly hereinafter)
Imidazoles -2- sulfenyls) ethane, the concentration for making 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane is 1 × 10-5~1 × 10-3mol/L.
30 DEG C, Q235 steel pickling is respectively used to, the corrosion inhibition rate of each pickle is determined, as a result as shown in table 3, and with (the benzo miaows of 1,2- bis-
Azoles -2- sulfenyls) ethane concentration C (mol/L) be abscissa, corrosion inhibition rate IE (%) be ordinate, obtain in 1mol/L sulfuric acid washings
In liquid, the graph of a relation of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) concentration and corrosion inhibition rate, as shown in Figure 3.
Influences of (benzimidazolyl-2 radicals-sulfenyl) ethane concentration to phosphoric acid pickle corrosion inhibition rate of 3 1,2- of table bis-
And with (benzimidazolyl-2 radicals-sulfenyl) the ethane concentration C of 1,2- bis- (mol/L) for abscissa, corrosion inhibition rate IE (%) is vertical
Coordinate, is obtained in 1mol/L phosphoric acid pickles, the relation of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration and corrosion inhibition rate
Figure, as shown in Figure 3.
According to the above results, 1 × 10-5~1 × 10-3In mol/L concentration ranges, the corrosion inhibition rate of phosphoric acid pickle with
The increase of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration is first raised and reduced afterwards, when 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) second
Alkane concentration is 5 × 10-4Mol/L, corrosion inhibition rate reaches 90.02%.
Embodiment 4
The present embodiment is influence of the temperature to hydrochloric acid pickler corrosion inhibition rate.
The present embodiment is by 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane according to same concentrations (5 × 10-4Mol/L) it is added to
In the HCl solution (1mol/L) of same concentrations, under condition of different temperatures, Q235 steel pickling is respectively used to, different temperatures is determined
When pickle corrosion inhibition rate, as a result as shown in table 4.
Influence of the temperature of table 4 to hydrochloric acid pickler corrosion inhibition rate
| Temperature (DEG C) | 20 | 25 | 30 | 35 | 40 |
| Inhibition efficiency (%) | 98.22 | 98.32 | 99.75 | 98.86 | 99.15 |
Meanwhile, with pickle temperature T (DEG C) for abscissa, corrosion inhibition rate IE (%) is ordinate, is obtained in 1mol/L sulfuric acid
In pickle, temperature and the graph of a relation of pickle corrosion inhibition rate, as shown in Figure 4.
The above results show, restrainer of the invention is inhibition in the range of 20~40 DEG C in hydrochloric acid pickler temperature
Rate change is little.
Embodiment 5
The present embodiment is influence of the temperature to sulfuric acid pickling solution corrosion inhibition rate.
The present embodiment is by 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane according to same concentrations (5 × 10-4Mol/L) it is added to
The H of same concentrations2SO4In solution (1mol/L), under condition of different temperatures, Q235 steel pickling is respectively used to, different temperatures is determined
When pickle corrosion inhibition rate, as a result as shown in table 5.
Influence of the temperature of table 5 to sulfuric acid pickling solution corrosion inhibition rate
| Temperature (DEG C) | 30 | 35 | 40 | 45 | 50 |
| Inhibition efficiency (%) | 99.47 | 98.92 | 98.55 | 97.40 | 95.46 |
Meanwhile, with pickle temperature T (DEG C) for abscissa, corrosion inhibition rate IE (%) is ordinate, is obtained in 1mol/L sulfuric acid
In pickle, temperature and the graph of a relation of pickle corrosion inhibition rate, as shown in Figure 5.
The above results show, restrainer of the invention is inhibition in the range of 30~50 DEG C in sulfuric acid pickling solution temperature
Rate is declined slightly, but change is little.
Embodiment 6
The present embodiment is influence of the temperature to phosphoric acid pickle corrosion inhibition rate.
The present embodiment is by 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane according to same concentrations (5 × 10-4Mol/L) it is added to
The H of same concentrations3PO4In solution (1mol/L), under condition of different temperatures, Q235 steel pickling is respectively used to, different temperatures is determined
When pickle corrosion inhibition rate, as a result as shown in table 6.
Influence of the temperature of table 6 to phosphoric acid pickle corrosion inhibition rate
| Temperature (DEG C) | 20 | 30 | 40 | 50 | 60 |
| Inhibition efficiency (%) | 91.32 | 90.02 | 89.13 | 88.25 | 87.93 |
Meanwhile, with pickle temperature T (DEG C) for abscissa, corrosion inhibition rate IE (%) is ordinate, is obtained in 1mol/L phosphoric acid
In pickle, temperature and the graph of a relation of pickle corrosion inhibition rate, as shown in Figure 6.
The above results show, restrainer of the invention is inhibition in the range of 20~60 DEG C in phosphoric acid wash temperature
Rate is declined slightly trend, but amplitude of variation is within 3.3%.
Embodiment 7
The present embodiment is influence of the time of repose to hydrochloric acid pickler corrosion inhibition rate.
The present embodiment is by 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane according to same concentrations (5 × 10-4Mol/L) it is added to
In the HCl solution (1mol/L) of same concentrations, under the conditions of 30 DEG C and different time of repose, Q235 steel pickling is respectively used to,
The corrosion inhibition rate of different time of repose pickles is determined, as a result as shown in table 7.
Influence of the time of repose of table 7 to hydrochloric acid pickler corrosion inhibition rate
| Time (h) | 0 | 24 | 48 | 72 | 96 | 120 |
| Inhibition efficiency (%) | 93.50 | 93.67 | 93.44 | 93.52 | 93.54 | 93.60 |
Meanwhile, with (benzimidazolyl-2 radicals-sulfenyl) the ethane concentration C of 1,2- bis- (mol/L) for abscissa, corrosion inhibition rate IE (%) is
Ordinate, is obtained in 1mol/L hydrochloric acid picklers, the relation of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration and corrosion inhibition rate
Figure, as shown in Figure 7.
It is the increasing of hydrochloric acid pickler corrosion inhibition rate over time in the range of 0~120h in the pickle time according to the above results
The change of long corrosion inhibition rate is little, illustrate the inhibition efficiency growth over time of the restrainer of the present invention, and change less, can be with
Use for a long time.
Embodiment 8
The present embodiment is influence of the time of repose to sulfuric acid pickling solution corrosion inhibition rate.
The present embodiment is by 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane according to same concentrations (5 × 10-4Mol/L) it is added to
The H of same concentrations2SO4In solution (1mol/L), under the conditions of 30 DEG C and different time of repose, Q235 steel pickling is respectively used to,
The corrosion inhibition rate of different time of repose pickles is determined, as a result as shown in table 8.
Influence of the time of repose of table 8 to sulfuric acid pickling solution corrosion inhibition rate
| Time (h) | 0 | 24 | 48 | 72 | 96 | 120 |
| Inhibition efficiency (%) | 95.45 | 95.33 | 95.98 | 95.52 | 95.53 | 95.54 |
Meanwhile, with (benzimidazolyl-2 radicals-sulfenyl) the ethane concentration C of 1,2- bis- (mol/L) for abscissa, corrosion inhibition rate IE (%) is
Ordinate, is obtained in 1mol/L sulfuric acid pickling solutions, the relation of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration and corrosion inhibition rate
Figure, as shown in Figure 8.
It is the increasing of sulfuric acid pickling solution corrosion inhibition rate over time in the range of 0~120h in the pickle time according to the above results
The change of long corrosion inhibition rate is little, illustrate the inhibition efficiency growth over time of the restrainer of the present invention, and change less, can be with
Use for a long time, use more facilitates.
Embodiment 9
The present embodiment is influence of the time of repose to phosphoric acid pickle corrosion inhibition rate.
The present embodiment is by 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane according to same concentrations (5 × 10-4Mol/L) it is added to
The H of same concentrations3PO4In solution (1mol/L), under the conditions of 30 DEG C and different time of repose, Q235 steel pickling is respectively used to,
The corrosion inhibition rate of different time of repose pickles is determined, as a result as shown in table 9.
Influence of the time of repose of table 9 to phosphoric acid pickle corrosion inhibition rate
| Time (h) | 0 | 24 | 48 | 72 | 96 | 120 |
| Inhibition efficiency (%) | 90.02 | 90.47 | 90.12 | 89.82 | 89.45 | 89.30 |
Meanwhile, with (benzimidazolyl-2 radicals-sulfenyl) the ethane concentration C of 1,2- bis- (mol/L) for abscissa, corrosion inhibition rate IE (%) is
Ordinate, is obtained in 1mol/L phosphoric acid pickles, the relation of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane concentration and corrosion inhibition rate
Figure, as shown in Figure 9.
It is that phosphoric acid pickle corrosion inhibition rate is over time in the range of 0~120h in pickle time of repose according to the above results
The change of growth corrosion inhibition rate it is little, illustrate the inhibition efficiency growth change over time of restrainer of the present invention less,
It can use for a long time.
In addition, inventor will also add various concentrations 1, various pickling made from 2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane
Liquid is used for the other metals of pickling, such as aluminium, copper, magnesium, zinc, almag, and by determining, it has same good inhibition effect
Really.
Corrosion inhibition rate IE (%) measure in the various embodiments described above, is carried out using row static suspension weight-loss method commonly used in the trade：
Consider at different temperatures, static suspension is soaked in blank acid to the different metal materials such as Q235 steel after weighing print respectively
In washing lotion and pickle added with 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane, stand and taken out after certain time, use vulcanite
Corrosion product is wiped, deionized water rinsing, acetone cleaning is weighed after drying.According to weight loss data its corrosion inhibition rate IE (%),
Calculation formula is as follows：
IE=[(V0-Vcorr)/V0] × 100%
In formula, V0And VcorrBlank pickle and the acid added with 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane are represented respectively
The weight loss rate of print in washing lotion, unit is mg/cm2.h。
Embodiment 11
The present embodiment is the preparation of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane
2-mercaptobenzimidazole is added into reactor, 2-mercaptobenzimidazole is dissolved in KOH solution, backflow is warming up to
Under state, start dropwise addition 1,2- Bromofumes are dripped after 1,2- Bromofumes, then are flowed back 2~3 hours, rear precipitation is a large amount of white
Terminate reaction after color solid, be cooled to room temperature, suction filtration is washed with massive laundering, be dried in vacuo, ethyl alcohol recrystallization obtains white powder
1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane.Fusing point：256~258 DEG C, yield 85.5~93.2%.
In terms of 1mol 2-mercaptobenzimidazoles, KOH quality is 50~70g, the volume of 1,2- Bromofume for 0.07~
0.10L, the volume of absolute ethyl alcohol is 0.3~1.0L, and the time for adding of 1,2- Bromofume is 10~40min.
The invention is not limited in foregoing embodiment.The present invention, which is expanded to, any in this manual to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (2)
1. one kind 1, application of (benzimidazolyl-2 radicals-sulfenyl) ethane of 2- bis- in metal pickle liquor is prepared, it is characterised in that：To not
With 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane is added in the inorganic pickling medium of concentration, it is 5 × 10 to make its concentration-4~1 ×
10-3Mol/L, the inorganic acid is hydrochloric acid or sulfuric acid.
2. a kind of metal pickle liquor, it is characterised in that：Including pickling medium and 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane, its
Middle pickling medium is hydrochloric acid or sulfuric acid, and the concentration of 1,2- bis- (benzimidazolyl-2 radicals-sulfenyl) ethane is 5 × 10-4~1 × 10-3mol/
L。
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| CN1044670A (en) * | 1989-02-01 | 1990-08-15 | 南京大学 | Nitrogen heterocyclic ring and metallic copper polycoordination prepare the technology of surfacecti proteon film |
| SU1743160A1 (en) * | 1990-09-04 | 1998-02-20 | Институт физико-органической химии и углехимии АН УССР | 1, 2-bis-(1-glycidylbenzimidazole-2-ylthio)-ethane as cohardening agent of epoxy resins and 1,2-bis-(benzimidazole-2-ylthio)-ethane as an intermediate compound for synthesis of 1, 2-bis-(1-glycidylbenzimidazole-2-ylthio)-ethane as cohardening agent of epoxy resins |
| CN101600816A (en) * | 2007-01-11 | 2009-12-09 | 阿斯科特克公司 | Corrosion inhibitor |
| CN103628076A (en) * | 2013-11-11 | 2014-03-12 | 青岛文创科技有限公司 | Citric acid compound corrosion inhibitor |
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| CN1044670A (en) * | 1989-02-01 | 1990-08-15 | 南京大学 | Nitrogen heterocyclic ring and metallic copper polycoordination prepare the technology of surfacecti proteon film |
| SU1743160A1 (en) * | 1990-09-04 | 1998-02-20 | Институт физико-органической химии и углехимии АН УССР | 1, 2-bis-(1-glycidylbenzimidazole-2-ylthio)-ethane as cohardening agent of epoxy resins and 1,2-bis-(benzimidazole-2-ylthio)-ethane as an intermediate compound for synthesis of 1, 2-bis-(1-glycidylbenzimidazole-2-ylthio)-ethane as cohardening agent of epoxy resins |
| CN101600816A (en) * | 2007-01-11 | 2009-12-09 | 阿斯科特克公司 | Corrosion inhibitor |
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