CN109722669A - A kind of carbon steel corrosion inhibitor of high solubility - Google Patents
A kind of carbon steel corrosion inhibitor of high solubility Download PDFInfo
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- CN109722669A CN109722669A CN201711023356.7A CN201711023356A CN109722669A CN 109722669 A CN109722669 A CN 109722669A CN 201711023356 A CN201711023356 A CN 201711023356A CN 109722669 A CN109722669 A CN 109722669A
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- carbon steel
- corrosion inhibitor
- pyruvic acid
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Abstract
The present invention relates to carbon steel corrosion inhibitor, specifically a kind of carbon steel corrosion inhibitor of pyruvic acid modified chitosan (PCTS) ingredient.Using pyruvic acid modified chitosan as the corrosion inhibiter of carbon steel main component compared with currently used organic carbon steel corrosion inhibitor, can natural degradation be nontoxic, low toxicity material, not can also cause environmental pollution, meet green corrosion inhibitor development trend；And it can be applied to acid, neutral and alkaline system, greatly extend the application range of chitosan inhibition；With good durability, higher corrosion inhibition can be kept for a long time.
Description
Technical field
The present invention relates to carbon steel corrosion inhibitor, specifically a kind of carbon steel inhibition of pyruvic acid modified chitosan (PCTS) ingredient
Agent.
Background technique
Corrosion be under various environmental activities material occur destruction, be modern industry and life in important destruction because
Element affects each different field, brings huge loss to national economy.According to investigation, every year because being passed through caused by corrosion
Ji loss accounts for about the 3%-4% of gross national product.Therefore anticorrosion work is carried out, not simple technical problem,
It has been related to protection resource, energy saving, the normal production of guarantee and personal safety, a series of great societies such as development new technology
And economic problems.Anti-corrosion method has external coating, surface treatment, electrochemical protection etc. at present, and it is a kind of for adding corrosion inhibiter
Simple process, low in cost, quick method, thus it is widely used in chemical cleaning, atmospheric environment, industrial water, petroleum
The multiple fields such as chemicals processing.With the enhancing gradually of people's environmental consciousness, it is many it is toxic, biological degradability is poor, to environment
The use of the corrosion inhibiter damaged is greatly limited, the research direction of corrosion inhibiter gradually to low toxicity, it is cheap, efficiently,
The directions such as environmental protection are developed.
Contain a large amount of amino and hydroxyl in chitosan molecule, lone pair electrons can be improved, there is certain absorption to metal
Ability has the potential quality as green corrosion inhibitor application, however since chitosan autolysis is poor, cause its corrosion inhibition compared with
It is low, it limits its application.And in recent years, chitosan derivatives main direction of studying is as restrainer and in seawater
Use under environment, and it is very few for the research under alkaline condition, therefore, it is modified or compound corrosion inhibitor makes in different corruption
It is used under erosion environment, application value with higher.
Summary of the invention
Technical problems based on background technology the invention proposes a kind of pyruvic acid modified chitosan and its preparation and are answered
With.
Technical solution of the present invention can be realized by following technical measures:
A kind of carbon steel corrosion inhibitor of high solubility, the corrosion inhibiter include pyruvic acid modified chitosan and for dissolving described third
The solvent medium of ketone acid chitosan.
Preferably, the solvent medium is acid flux material, basic solvent or neutral flux.
Preferably, the solvent medium is aqueous hydrochloric acid solution, sodium hydrate aqueous solution or sodium-chloride water solution.
Preferably, concentration of the pyruvic acid modified chitosan in corrosion inhibiter is 100-400mg/L.
Preferably, the application temperature of the corrosion inhibiter is 25-60 DEG C.
The present invention is due to having the advantage that corrosion inhibiter of the present invention compared with prior art using above-mentioned technical solution
Compared with currently used organic carbon steel corrosion inhibitor, can natural degradation be nontoxic, low toxicity material, dirt will not be caused to environment
Dye meets the trend of green corrosion inhibitor development；And it can be applied to acid, neutral and alkaline system, greatly extend shell
The application range of glycan inhibition；With good durability, higher corrosion inhibition can be kept for a long time.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings, but the embodiment in attached drawing is not constituted to any limit of the invention
System.
Fig. 1 is the infrared spectrogram of pyruvic acid modified chitosan obtained by the present invention.
Specific embodiment
To keep the present invention easier to understand, specific embodiments of the present invention are further illustrated below.
The preparation method of water-soluble pyruvic acid modified chitosan:
The chitosan of 2.0g is accurately weighed first in 100mL three-necked flask, the distilled water that about 50mL is added sufficiently is swollen,
It is that pyruvic acid is added in 1:1 according to chitosan and pyruvic acid mass ratio, stirring at normal temperature 1h dissolves chitosan sufficiently, is filtered to remove
Insoluble matter detects pH with pH meter, adjusts pH value in reaction to 4 with the diluted sodium hydroxide solution of 0.1mol/L, set reaction temperature as
25 DEG C, it is stirred to react 3h, 1.7g sodium borohydride addition about 5mL distilled water is weighed and is configured to sodium borohydride solution, be slowly added to anti-
System is answered, is continued after stirring 1.5h, adjusting pH value with 1mol/L dilute hydrochloric acid solution after detecting pH value with pH meter is 7-8, is sealed quiet
It sets for 24 hours.Solution filtering, filtrate is slowly dropped into dehydrated alcohol, and being stirred continuously is precipitated white precipitate sufficiently, is filtered, filter
After slag is successively respectively washed three times with anhydrous ether, dehydrated alcohol, the pyruvic acid shell that white powder can be obtained in air drying is poly-
Sugar.
Examination of infrared spectrum is carried out to gained pyruvic acid modified chitosan, test results are shown in figure 1, in the infrared light of chitosan
In spectrogram, in 3427.85cm-1There is a wide absorption peak, is-NH2N-H stretching vibration and-OH stretching vibration absworption peak
Overlapping and generate；In 2874.81cm-1There is an absorption peak at place, is-NH2In N-H key due to hydrogen bond influence, bands of a spectrum to
The N-H stretching vibration peak of lower wave number displacement.In 1077.93cm-1There is C-N stretching vibration absworption peak at place.In pyruvic acid modified chitosan
Infrared spectrogram, in 3504.97cm-1Only there is an absorption peak in place, this is the flexible vibration of-NH- key in pyruvic acid modified chitosan
Dynamic peak；In 1641.54cm-1There is a strong absorption peak in place, this is the C=O stretching vibration key band of-COOH, so
The reaction of schiff alkali occurs in-NH2On.
The present invention carries out weightless test using static full leaching suspension method to characterize corrosion inhibition.Every group of experiment choosing of weightless test
With 3 parallel samples.Experiment is carried out in water-bath at a temperature of setting, regular replenishment deionized water in experimentation,
To guarantee that density of corrosion inhibitor remains unchanged in corrosive medium.
Weight-loss method is the weight change after corroding the regular hour in the medium according to metal, before and after corroding to determine inhibition
The corrosion rate of agent.This is most heavy in research corrosion inhibiter corrosion inhibition most basic method and all corrosion inhibiter evaluation methods
It wants, closest to the method for the practical corrosion condition of metal.For convenience of under different experimental conditions and the data of various sample are compared to each other
Analysis, generallys use the weightlessness in the unit time on unit area i.e. formula (1) to characterize average corrosion rate, by formula (2)
Corrosion inhibiter can be obtained to the inhibition efficiency of carbon steel.
Wherein, ν is the corrosion rate (gm of sample-2·h-1)；
W0For the sample mass (g) before experiment；
W1For the sample mass (g) after experiment；
S is the surface area (mm of experimental sample piece2)；
T is experimental period (h)；
η is inhibition efficiency；
ν0Corrosion rate (the gm of sample when to be not added with corrosion inhibiter-2·h-1)；
νinhFor the corrosion rate (gm of sample after addition corrosion inhibiter-2·h-1)。
Embodiment 1
Experimental material is Q235 carbon steel, and above-mentioned resulting pyruvic acid modified chitosan is dissolved in 1mol/L hydrochloric acid, is sufficiently stirred
Dissolution, can be obtained pyruvic acid modified chitosan acid system corrosion inhibiter, density of corrosion inhibitor 100mg/L is placed in closed wide-mouth bottle
In.Then Q235 carbon steel is placed in the above-mentioned corrosion inhibiter at 25 DEG C, experimental period 4h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 33.25%, display corrosion inhibiter has certain inhibition effect
Fruit.
Embodiment 2
Experimental material is Q235 carbon steel, and above-mentioned resulting pyruvic acid modified chitosan is dissolved in 1mol/L hydrochloric acid, is sufficiently stirred
Dissolution, can be obtained pyruvic acid modified chitosan acid system corrosion inhibiter, density of corrosion inhibitor 100mg/L places corrosion inhibitor solution
Be sealed in wide-mouth bottle three days, then Q235 carbon steel be placed in the above-mentioned corrosion inhibiter at 25 DEG C again, experimental period 4h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 31.90%, compared with Example 1, the inhibition of the two is imitated
Rate is almost the same, shows that corrosion inhibiter has certain persistence.
Embodiment 3
Condition: experimental material is Q235 carbon steel, above-mentioned resulting pyruvic acid modified chitosan is dissolved in 1mol/L hydrochloric acid, sufficiently
Stirring and dissolving, can be obtained pyruvic acid modified chitosan corrosion inhibiter, and density of corrosion inhibitor 200mg/L is placed in closed wide-mouth bottle.So
Q235 carbon steel is placed in the above-mentioned corrosion inhibiter at 25 DEG C afterwards, experimental period 4h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 48.30%, display corrosion inhibiter has certain inhibition effect
Fruit.
Embodiment 4
Condition: experimental material is Q235 carbon steel, above-mentioned resulting pyruvic acid modified chitosan is dissolved in 1mol/L hydrochloric acid, sufficiently
Stirring and dissolving, can be obtained pyruvic acid modified chitosan corrosion inhibiter, and density of corrosion inhibitor 300mg/L is placed in closed wide-mouth bottle.So
Q235 carbon steel is placed in the above-mentioned corrosion inhibiter at 25 DEG C afterwards, experimental period 4h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 52.99%, display corrosion inhibiter has certain inhibition effect
Fruit.
Embodiment 5
Condition: experimental material is Q235 carbon steel, above-mentioned resulting pyruvic acid modified chitosan is dissolved in 1mol/L hydrochloric acid, sufficiently
Stirring and dissolving, can be obtained pyruvic acid modified chitosan corrosion inhibiter, and density of corrosion inhibitor 400mg/L is placed in closed wide-mouth bottle.So
Q235 carbon steel is placed in the above-mentioned corrosion inhibiter at 25 DEG C afterwards, experimental period 4h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 68.08%, display corrosion inhibiter has inhibition effect at normal temperature
Fruit.
Embodiment 6
Condition: experimental material is Q235 carbon steel, above-mentioned resulting pyruvic acid modified chitosan is dissolved in 1mol/L hydrochloric acid, sufficiently
Stirring and dissolving, can be obtained pyruvic acid modified chitosan corrosion inhibiter, and density of corrosion inhibitor 400mg/L is placed in closed wide-mouth bottle.So
Q235 carbon steel is placed in the above-mentioned corrosion inhibiter at 40 DEG C afterwards, experimental period 4h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 47.25%, display corrosion inhibiter has certain inhibition effect
Fruit.
Embodiment 7
Condition: experimental material is Q235 carbon steel, above-mentioned resulting pyruvic acid modified chitosan is dissolved in 1mol/L hydrochloric acid, sufficiently
Stirring and dissolving, can be obtained pyruvic acid modified chitosan corrosion inhibiter, and density of corrosion inhibitor 400mg/L is placed in closed wide-mouth bottle.So
Q235 carbon steel is placed in the above-mentioned corrosion inhibiter at 50 DEG C afterwards, experimental period 4h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 41.46%, display corrosion inhibiter has certain inhibition effect
Fruit.
Embodiment 8
Condition: experimental material is Q235 carbon steel, above-mentioned resulting pyruvic acid modified chitosan is dissolved in 1mol/L hydrochloric acid, sufficiently
Stirring and dissolving, can be obtained pyruvic acid modified chitosan corrosion inhibiter, and density of corrosion inhibitor 400mg/L is placed in closed wide-mouth bottle.So
Q235 carbon steel is placed in the above-mentioned corrosion inhibiter at 60 DEG C afterwards, experimental period 4h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 29.16%, display corrosion inhibiter has one under the high temperature conditions
Fixed corrosion mitigating effect.
Embodiment 9
Experimental material is Q235 carbon steel, and above-mentioned resulting pyruvic acid modified chitosan is dissolved in 0.5mol/L sodium hydroxide solution
In, dissolution is sufficiently stirred, pyruvic acid modified chitosan alkaline system corrosion inhibiter, density of corrosion inhibitor 50mg/L, by inhibition can be obtained
Agent solution is placed in wide-mouth bottle, and then Q235 carbon steel is placed in the above-mentioned corrosion inhibiter at 25 DEG C again, experimental period 12h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 48.77%, display corrosion inhibiter has inhibition effect at normal temperature
Fruit.
Embodiment 10
Experimental material is Q235 carbon steel, and above-mentioned resulting pyruvic acid modified chitosan is dissolved in 0.5mol/L sodium hydroxide solution
In, dissolution is sufficiently stirred, pyruvic acid modified chitosan alkaline system corrosion inhibiter, density of corrosion inhibitor 100mg/L, by inhibition can be obtained
Agent solution is placed in wide-mouth bottle, and then Q235 carbon steel is placed in the above-mentioned corrosion inhibiter at 25 DEG C again, experimental period 12h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 56.43%, display corrosion inhibiter has certain inhibition effect
Fruit.
Embodiment 11
Experimental material is Q235 carbon steel, and above-mentioned resulting pyruvic acid modified chitosan is dissolved in 0.5mol/L sodium hydroxide solution
In, dissolution is sufficiently stirred, pyruvic acid modified chitosan alkaline system corrosion inhibiter, density of corrosion inhibitor 150mg/L, by inhibition can be obtained
Agent solution is placed in wide-mouth bottle, and then Q235 carbon steel is placed in the above-mentioned corrosion inhibiter at 25 DEG C again, experimental period 12h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 56.85%, display corrosion inhibiter has certain inhibition effect
Fruit.
Embodiment 12
Experimental material is Q235 carbon steel, and above-mentioned resulting pyruvic acid modified chitosan is dissolved in 0.5mol/L sodium hydroxide solution
In, dissolution is sufficiently stirred, pyruvic acid modified chitosan alkaline system corrosion inhibiter, density of corrosion inhibitor 200mg/L, by inhibition can be obtained
Agent solution is placed in wide-mouth bottle, and then Q235 carbon steel is placed in the above-mentioned corrosion inhibiter at 25 DEG C again, experimental period 12h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 71.70%, display corrosion inhibiter is imitated with good inhibition
Fruit.
Embodiment 13
Experimental material is Q235 carbon steel, above-mentioned resulting pyruvic acid modified chitosan is dissolved in 3.5% sodium chloride solution, sufficiently
Stirring and dissolving, can be obtained pyruvic acid modified chitosan neutral system corrosion inhibiter, and density of corrosion inhibitor 50mg/L puts corrosion inhibitor solution
Be placed in wide-mouth bottle, then Q235 carbon steel be placed in the above-mentioned corrosion inhibiter at 25 DEG C again, experimental period 6h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 25.55%, display corrosion inhibiter has certain inhibition effect
Fruit.
Embodiment 14
Experimental material is Q235 carbon steel, above-mentioned resulting pyruvic acid modified chitosan is dissolved in 3.5% sodium chloride solution, sufficiently
Pyruvic acid modified chitosan neutral system corrosion inhibiter, density of corrosion inhibitor 100mg/L, by corrosion inhibitor solution can be obtained in stirring and dissolving
Be placed in wide-mouth bottle, then Q235 carbon steel be placed in the above-mentioned corrosion inhibiter at 25 DEG C again, experimental period 6h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 57.41%, display corrosion inhibiter has certain inhibition effect
Fruit.
Embodiment 15
Experimental material is Q235 carbon steel, above-mentioned resulting pyruvic acid modified chitosan is dissolved in 3.5% sodium chloride solution, sufficiently
Pyruvic acid modified chitosan neutral system corrosion inhibiter, density of corrosion inhibitor 150mg/L, by corrosion inhibitor solution can be obtained in stirring and dissolving
Be placed in wide-mouth bottle, then Q235 carbon steel be placed in the above-mentioned corrosion inhibiter at 25 DEG C again, experimental period 6h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 44.51%, display corrosion inhibiter has certain inhibition effect
Fruit.
Embodiment 16
Experimental material is Q235 carbon steel, above-mentioned resulting pyruvic acid modified chitosan is dissolved in 3.5% sodium chloride solution, sufficiently
Pyruvic acid modified chitosan neutral system corrosion inhibiter, density of corrosion inhibitor 200mg/L, by corrosion inhibitor solution can be obtained in stirring and dissolving
Be placed in wide-mouth bottle, then Q235 carbon steel be placed in the above-mentioned corrosion inhibiter at 25 DEG C again, experimental period 6h.
By the inhibition efficiency for testing the carbon steel that test obtains are as follows: 24.55%, display corrosion inhibiter has certain inhibition effect
Fruit.
It is important to emphasize that described above is only the preferred embodiment of the present invention, protection scope of the present invention
It is not limited merely to above-described embodiment, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.Institute
The those of ordinary skill in category field can also make other various forms of variations on the basis of the above description, here can not
Without providing embodiment to all embodiments, but the obvious variation thus amplified out is still in guarantor of the invention
Protect range.
Claims (5)
1. a kind of carbon steel corrosion inhibitor of high solubility, which is characterized in that the corrosion inhibiter includes pyruvic acid modified chitosan and is used for
Dissolve the solvent medium of the pyruvic acid modified chitosan.
2. the carbon steel corrosion inhibitor of high solubility according to claim 1, which is characterized in that the solvent medium is acidity
Solvent, basic solvent or neutral flux.
3. the carbon steel corrosion inhibitor of high solubility according to claim 1, which is characterized in that the solvent medium is hydrochloric acid
Aqueous solution, sodium hydrate aqueous solution or sodium-chloride water solution.
4. the carbon steel corrosion inhibitor of high solubility according to claim 1, which is characterized in that the pyruvic acid modified chitosan exists
Concentration in corrosion inhibiter is 100-400mg/L.
5. the carbon steel corrosion inhibitor of high solubility according to claim 1, which is characterized in that the application temperature of the corrosion inhibiter
Degree is 25-60 DEG C.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4209218B2 (en) * | 2003-02-19 | 2009-01-14 | 日本ペイント株式会社 | Antifouling paint composition and antifouling coating film |
| CN101532139A (en) * | 2008-03-14 | 2009-09-16 | 中国科学院海洋研究所 | Water soluble corrosion inhibitor for inhibiting seawater corrosion of carbon steel and preparation method thereof |
| CN103113491A (en) * | 2011-11-17 | 2013-05-22 | 中国科学院海洋研究所 | Carboxymethyl chitosan, and preparation and application thereof |
| CN105968229A (en) * | 2016-06-06 | 2016-09-28 | 中国科学院海洋研究所 | Chitosan modified derivative corrosion inhibitor and preparation method thereof |
-
2017
- 2017-10-27 CN CN201711023356.7A patent/CN109722669A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4209218B2 (en) * | 2003-02-19 | 2009-01-14 | 日本ペイント株式会社 | Antifouling paint composition and antifouling coating film |
| CN101532139A (en) * | 2008-03-14 | 2009-09-16 | 中国科学院海洋研究所 | Water soluble corrosion inhibitor for inhibiting seawater corrosion of carbon steel and preparation method thereof |
| CN103113491A (en) * | 2011-11-17 | 2013-05-22 | 中国科学院海洋研究所 | Carboxymethyl chitosan, and preparation and application thereof |
| CN105968229A (en) * | 2016-06-06 | 2016-09-28 | 中国科学院海洋研究所 | Chitosan modified derivative corrosion inhibitor and preparation method thereof |
Non-Patent Citations (2)
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| 梁婧宇等: "丙酮酸壳聚糖的合成及其吸附性能", 《天津工业大学学报》 * |
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