CN101967643A - Application of chitosan used as brass corrosion inhibitor - Google Patents
Application of chitosan used as brass corrosion inhibitor Download PDFInfo
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- CN101967643A CN101967643A CN 201010239234 CN201010239234A CN101967643A CN 101967643 A CN101967643 A CN 101967643A CN 201010239234 CN201010239234 CN 201010239234 CN 201010239234 A CN201010239234 A CN 201010239234A CN 101967643 A CN101967643 A CN 101967643A
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- brass
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- corrosion inhibitor
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Abstract
The invention discloses an application of chitosan (CTS) used as a brass corrosion inhibitor, belonging to the technical fields of corrosion and protection of metal materials. The concentration of the CTS in the HCL solution of 0.1mol/L is 0-1.5g/L. The electrochemical data show that when the CTS is used as a brass corrosion inhibitor in the HCL solution of 0.1mol/L, the CTS has better corrosion inhibition effect; and especially, after the corrosion inhibitor CTS of 1.0g/L is added into the HCL solution of 0.1mol/L, the corrosion current of the brass is obviously reduced from 11.54mu A/cm<2> to 5.76mu A/cm<2>, and the corrosion inhibition efficiency is 54.08%. Thus, the results prove that the CTS can be used as the brass corrosion inhibitor, is a natural high molecular organic matter, has the advantages of rich resources, no toxicity and harm, easy biological degradation and the like, and has better corrosion inhibition effect on the brass in the system after being used.
Description
Technical field
The present invention relates to the application of chitosan, belong to metallic material corrosion and guard technology field as brass anticorrosion corrosion inhibitor.
Background technology
The binary alloy that brass is made up of copper and zinc.Brass is widely used in heat exchanger, condenser, cryogenic pipe and seabed delivery tube etc. because of its good mechanical performance, processing performance, electrical and thermal conductivity performance and corrosion resisting property.Yet the equipment run duration, be everlasting equipment or pipeline surface deposition of part composition in the medium descends heat exchange efficiency, just needs to carry out matting with acidic cleaner, and wherein hydrochloric acid is most widely used clean-out system.In cleaning process brass corrosion very easily takes place and and cause equipment perforation to be lost efficacy, often cause enormous economic loss.Therefore, the brass inhibition problem in the hydrochloric acid medium just is even more important.
In clean-out system, add inhibiter and not only can effectively control corrosion, also can not destroy original technical process simultaneously, need add any equipment hardly, have economy, efficient, characteristics such as suitability is strong, be used widely.Along with the deterioration of global environment and the enhancing of human environment protection consciousness, the friendly type green corrosion inhibitor of development environment has become important Sustainable development measure.At present the restrainer great majority are the organism of nitrogenous, sulphur, oxygen, phosphorus, and are common as benzotriazole, 2-mercapto benzothiazole, propiolic alcohol etc.Yet, the critical defect of this class inhibiter be poisonous and also great majority wherein not biodegradable.A kind of brass anticorrosion corrosion inhibitor-chitosan that the present invention proposes for head it off just.
Chitosan (chitosan CTS) is a kind of natural polymer organism (as figure below) of straight chain type,
Chemical name is (1,4)-2-amino-2-deoxidation-callose, and its resource is very abundant mainly to be obtained by de-acetyl chitin, nontoxic, harmless, readily biodegradable itself, intramolecularly contain-OH and-NH
2The isoreactivity group has very high chemically reactive, hydrolysis, reaction such as carboxylated, crosslinked easily take place and obtains new structure and performance.Contain a large amount of amino that organic inhibitor possessed, oh group in the molecular structure of chitosan (CTS), can with the metallic element coordination, firmly be adsorbed on the metallic surface, form protective membrane, thereby prevent metallic corrosion.Chitosan has certain corrosion mitigating effect, and its environmental protection, cheapness in addition have higher using value with its active principle that is developed to inhibiter independently or compound corrosion inhibitor.Yet chitosan is as a kind of environmentally friendly inhibiter, and the research to the brass corrosion inhibition in 0.1mol/LHCl solution is not seen in report as yet.
Summary of the invention
The object of the invention provides a kind of new environmentally friendly brass anticorrosion corrosion inhibitor in order to overcome the shortcoming that brass anticorrosion corrosion inhibitor exists in the prior art.
Technical scheme of the present invention
Chitosan is as the application of brass anticorrosion corrosion inhibitor.
The concentration of chitosan in 0.1mol/LHCl solution is 0.005～1.5g/L.
It is best when the concentration of chitosan in 0.1mol/LHCl solution is 1.0g/L to the corrosion mitigating effect of brass.
Beneficial effect of the present invention
A kind of brass anticorrosion corrosion inhibitor of the present invention is green water treatment agent, participate in the carbon and the nitrogen cycle of ecosystem after its biological degradation, ball ecological environment is played important regulation, environment is not had harm, the needs that meet sustainable development view, and raw material is easy to get.Electrochemical data shows that in 0.1mol/LHCl solution chitosan is had corrosion mitigating effect preferably as the brass corrosion inhibitor, after particularly in 0.1mol/LHCl solution, adding 1.0g/L inhibiter chitosan, the corrosion current of brass significantly reduces, from 11.54 μ A/cm
2Drop to 5.76 μ A/cm
2, inhibition efficiency is 54.08%.
Description of drawings
Fig. 1, brass electrode are not adding and are adding Nyquist figure after soaking 0.5h in the 0.1mol/LHCl solution of different concns inhibiter chitosan
Fig. 2, brass electrode are not adding and are adding polarization curve after soaking 0.5h in the 0.1mol/LHCl solution of different concns inhibiter chitosan
Embodiment
Also in conjunction with the accompanying drawings the present invention is further set forth below by embodiment, but do not limit the present invention.
Embodiment 1
One, solution preparation
Chitosan (BR): taking off second phthalein degree is 80.0～95.0%, and white powder is implemented system 0.1mol/LHCl solution.
Used vessel are all used the deionized water lotion in the experiment, and used solution is all prepared with deionized water.
Two, brass electrode
The brass electrode non-working surface is made with epoxy sealing, and working area is 1.0cm
2, measure front surface with 1#, 3#, 5# abrasive paper for metallograph sanding and polishing step by step, deionized water rinsing, the dehydrated alcohol oil removing is put into electrolyzer and is stablized after 30 minutes and test after rinsing well with deionized water again.
Three, testing method
The test of alternating-current impedance and polarization curve
Adopt classical three-electrode system, working electrode is a brass electrode.Used supporting electrode is platinum electrode, and reference electrode is saturated calomel electrode (SCE), and current potential shown in the present is all with respect to saturated calomel electrode.
The mensuration equipment used of alternating-current impedance and polarization curve adopts Shanghai China in morning electrochemical workstation CHI660C, and the ac impedance measurement range of frequency is 100.00kHz～50.00mHz, and ac-excited signal is 10mV, and the scanning speed of polarization curve is 1mV/s.
During alternating-current impedance was measured, blank represented that promptly with 0.1mol/LHCl solution be medium, and the add-on of inhibiter is 0mg/L.
Accompanying drawing 1 is not adding and is adding Nyquist figure after soaking 0.5h in the 0.1mol/LHCl solution of different concns inhibiter chitosan for brass electrode, and wherein curve 1, curve 2, curve 3, curve 4, curve 5, curve 6 and curve 7 represent that respectively CTS is that the Nyquist of 0g/L, 0.005g/L, 0.05g/L, 0.1g/L, 0.5g/L, 1.0g/L, 1.5g/L schemes.When having inhibiter in the solution, inhibiter and metal function form layer protecting film, embody corrosion mitigating effect.Corresponding ac impedance measurement result is impedance spectrogram (Nyquist figure), and the impedance spectrogram is irregular capacitive reactance arc, shows that the corrosion of brass in the system of being studied is mainly controlled by charge transfer.Chord length on arc and the Z axle is corresponding to the membrane resistance R of brass electrode
f, R
fBig more, illustrate that corrosion mitigating effect is good more.
As can be seen from Figure 1, compare with blank solution, the impedance spectrogram chord length that adds the brass electrode correspondence of CTS inhibiter obviously increases, but after CTS surpassed 1.0g/L, impedance spectrogram chord length was on a declining curve, and the corrosion resisting property of copper descends on the contrary, therefore, when CTS concentration was 1.0g/L, corrosion mitigating effect was best.
Drawn in 0.1mol/LHCl solution CTS to brass tool corrosion inhibiting ability preferably by AC impedence method, and drawn the optimum concn of CTS as inhibiter.
To be brass electrodes do not adding and adding polarization curve after soaking 0.5h in the 0.1mol/LHCl solution of different concns inhibiter chitosan accompanying drawing 2, wherein curve 1, curve 2, curve 3, curve 4, curve 5, curve 6 and curve 7 represent that respectively CTS is 0g/L, 0.005g/L, 0.05g/L, 0.1g/L, 0.5g/L, 1.0g/L, 1.5g/L polarization curve, and corresponding corrosion potential and corrosion electric current density data see Table 1.The inhibition efficiency of inhibiter (η %) calculates according to following formula:
I
0Corrosion electric current density after being respectively blank assay and adding inhibiter with I.
The electrochemical parameter that table 1 brass obtains in the 0.1mol/LHCl of different concns CTS solution
As known from Table 1, when not adding inhibiter CTS in 0.1mol/LHCl solution, the corrosion current of brass electrode is 11.54 μ A/cm
2, along with the adding corrosion current of inhibiter diminishes, when CTS concentration is 1.0g/L, the corrosion current minimum of corresponding copper electrode is 5.76 μ A/cm
2, its corresponding inhibition efficiency is also the highest, is 54.1%, illustrates that CTS has corrosion mitigating effect preferably to the brass in the 0.1mol/LHCl solution.This is consistent with the conclusion that AC impedence method draws.In addition, negative moving takes place in the corrosion potential and the cathodic polarization curve that also add brass electrode behind the inhibiter CTS from polarization curve as can be seen, illustrates that this inhibiter is the cathode type inhibiter.
Above said content only is the basic explanation of the present invention under conceiving, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Claims (3)
1. chitosan is as the application of brass anticorrosion corrosion inhibitor.
2. chitosan is characterized in that as the application of brass anticorrosion corrosion inhibitor described application is that the concentration of chitosan in 0.1mol/LHCl solution is 0.005～1.5g/L according to claim 1.
3. chitosan is characterized in that as the application of brass anticorrosion corrosion inhibitor described application is that the concentration of chitosan in 0.1mol/LHCl solution is 1.0g/L according to claim 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010239234 CN101967643A (en) | 2010-07-29 | 2010-07-29 | Application of chitosan used as brass corrosion inhibitor |
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|---|---|---|---|
| CN 201010239234 CN101967643A (en) | 2010-07-29 | 2010-07-29 | Application of chitosan used as brass corrosion inhibitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103668220A (en) * | 2012-09-21 | 2014-03-26 | 成都飞机工业（集团）有限责任公司 | Environment-friendly inter-process antirust liquid |
| CN104049476A (en) * | 2014-05-30 | 2014-09-17 | 青岛华仁技术孵化器有限公司 | Photoresist remover |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101532138A (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 |
| CN101580942A (en) * | 2009-06-25 | 2009-11-18 | 济南大学 | Chitosan carbon steel restrainer and use thereof |
-
2010
- 2010-07-29 CN CN 201010239234 patent/CN101967643A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101532138A (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 |
| CN101580942A (en) * | 2009-06-25 | 2009-11-18 | 济南大学 | Chitosan carbon steel restrainer and use thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103668220A (en) * | 2012-09-21 | 2014-03-26 | 成都飞机工业（集团）有限责任公司 | Environment-friendly inter-process antirust liquid |
| CN103668220B (en) * | 2012-09-21 | 2016-09-07 | 成都飞机工业（集团）有限责任公司 | Environment-friendlyinter-process inter-process antirust liquid |
| CN104049476A (en) * | 2014-05-30 | 2014-09-17 | 青岛华仁技术孵化器有限公司 | Photoresist remover |
| CN104049476B (en) * | 2014-05-30 | 2017-11-14 | 青岛华仁技术孵化器有限公司 | Light carving rubber stripper |
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Application publication date: 20110209 |