CN101092698A - Method for forming anti corrosion film of self-assembled single molecule on surface of HSn70-1 brass - Google Patents
Method for forming anti corrosion film of self-assembled single molecule on surface of HSn70-1 brass Download PDFInfo
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- CN101092698A CN101092698A CN 200710044078 CN200710044078A CN101092698A CN 101092698 A CN101092698 A CN 101092698A CN 200710044078 CN200710044078 CN 200710044078 CN 200710044078 A CN200710044078 A CN 200710044078A CN 101092698 A CN101092698 A CN 101092698A
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- hsn70
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Abstract
This invention discloses a method for forming self-assembled monomolecular corrosion inhibitor film on HSn70-1 brass surface. The method comprises: (1) polishing HSn70-1 brass by 0#-6# in sequence, degreasing with absolute ethanol, and washing with deionized water; (2) preparing 1X10-3 mol/L corrosion inhibitor solution with ATA; (3) Immersing HSn70-1 brass in ATA corrosion inhibitor solution at 20-30 deg.C for 0.5-2 h to form ATA self-assembled monomolecular corrosion inhibitor film. The ATA corrosion inhibitor is environmentally friendly. Electrochemical data show that the corrosion current of HSn70-1 brass after film-forming in ATA self-assembly solution for 1 h is largely reduced to only 1.096 mu.A.cm-2, and the corrosion inhibiting efficiency is about 96.69%.
Description
Technical field
The present invention relates to a kind of the method for anti-corrosive treatment be carried out in the metallic surface, more particularly relate to a kind of HSn70-1 brass be carried out the method that surface treatment forms the unit molecule corrosion-proof film.
Background technology
Metallic corrosion is the thermodynamics spontaneous process that becomes the state of oxidation under metal corrosive medium in environment is had an effect.It is reported that the annual financial loss that causes owing to metallic corrosion accounts for 1.5～2.4% of gross national product.In order to tackle the metallic corrosion aggravation, people use more and more to inhibiter, but the inhibiter great majority of using at present are not the inhibiter of environmental protection, more or less can produce certain harm to environment.In order to slow down metallic corrosion or to prevent metallic corrosion, the method that adopts coating protection be in the anti-corrosion method most widely used general also be effective measures.With specific inhibiter, on the metallic surface, form fine and close, orderly unimolecular film as the self-assembly of inhibiter molecule and can stop the erosion of surrounding medium, protecting group substrate corrosion base metal.3-amino-1,2,4-triazole (ATA) is a kind of broad-spectrum organic synthesis intermediate, also be the extraordinary biochemical reagents that are used for the human body protein tryptophane, owing to its photosensitivity and biological activity are widely used in antibiotic class medicine, triazole species diimide dyestuff, sensitive materials, synthetic and the preparation of systemic fungicide and plant-growth regulator, but because it has very strong chelating, can form the huge legendary turtle compound and stop metallic corrosion attached to the metal vessel surface, non-toxic phosphorus-free can attempt being used as the anticorrosive metal inhibiter.3-amino-1,2,4-triazole (ATA) are to the corrosion inhibition of HSn70-1 brass and to be used for forming the research report of aspects such as self-composed monomolecular corrosion-proof film still rare both at home and abroad.
Summary of the invention
Technical problem to be solved by this invention provides that a kind of to be main active ingredient with ATA form the method for self-composed monomolecular corrosion-proof film in the HSn70-1 brass surfaces, and it is low that the present invention has an ATA consumption, the outstanding advantage that the corrosion-mitigation scale-inhibition ability is strong, environmentally safe.
A kind of method at HSn70-1 brass surfaces formation self-composed monomolecular corrosion-proof film comprises the following steps:
A. with HSn70-1 brass earlier through 0#～6# after sanding and polishing, dehydrated alcohol oil removing, deionized water are cleaned step by step, standby;
B. ATA being mixed with concentration is 1 * 10
-3The corrosion inhibitor solution of mol/L;
C. the HSn70-1 brass with above-mentioned processing impregnated in the above-mentioned ATA corrosion inhibitor solution that is mixed with, and dipping temperature is 20～30 ℃, and dipping time is 0.5～2 hour, finally forms ATA self-composed monomolecular corrosion-proof film in the HSn70-1 brass surfaces.
The dipping time of HSn70-1 brass in the ATA corrosion inhibitor solution is 1 hour among the step c.
The beneficial effect of the invention; the inhibiter of the ATA that the present invention adopts is a kind of green, environmental protection inhibiter; environment there is not harm; the present invention passes through to form the mode of self-composed monomolecular corrosion-proof film (SAMs) in HSn70-1 brass surfaces film forming with above-mentioned inhibiter; slow down brass corrosion and take place, have good corrosion inhibiting effect.Electrochemical data shows that the corrosion current of HSn70-1 brass film forming 1h in ATA self-assembly solution reduces greatly, only is 1.096 μ Acm
-2, inhibition efficiency is about 96.69%, and the present invention has tangible corrosion mitigating effect to the HSn70-1 brass in the 3%NaCl solution.
Description of drawings
Fig. 1 is that the HSn70-1 brass electrode is 10
-3The time potential curve figure that assembles in the ATA self-assembly liquid of mol/L;
Fig. 2 is that the HSn70-1 brass electrode of assembling different time ATA SAMs immerses the alternating-current impedance figure (Nyquist figure) in the 3%NaCl solution respectively;
Fig. 3 is that the HSn70-1 brass electrode of assembling different time ATA SAMs immerses polarization curve in the 3%NaCl solution respectively.
Embodiment
Below by embodiment and accompanying drawing the present invention is described in further detail, a kind of method that forms the self-composed monomolecular corrosion-proof film in the HSn70-1 brass surfaces, comprise the following steps: a. with HSn70-1 brass earlier through 0#～6# after sanding and polishing, dehydrated alcohol oil removing, deionized water are cleaned step by step, standby; B. ATA being mixed with concentration is 1 * 10
-3The corrosion inhibitor solution of mol/L; C. the HSn70-1 brass with above-mentioned processing impregnated in the above-mentioned ATA corrosion inhibitor solution that is mixed with, and dipping temperature is 20～30 ℃, and dipping time is 0.5～2 hour, finally forms ATA self-composed monomolecular corrosion-proof film in the HSn70-1 brass surfaces.The dipping time of HSn70-1 brass in the ATA corrosion inhibitor solution is 1 hour among the step c.
Embodiment
One, solution preparation
ATA:C
2H
4N
4, white or pale yellow powder, soluble in water, nontoxic.
Enforcement system: 3%NaCl solution
Used vessel all will be used deionized water wash in the experiment.Deionized water is all used in the preparation of all solution.
Two, HSn70-1 brass electrode
Electrode selects for use the HSn70-1 brass material to test.HSn70-1 brass electrode non-working surface is made with epoxy sealing.Electrode area is 0.35cm
-2, the HSn70-1 brass electrode is with 0 before measuring
#-6
#Abrasive paper for metallograph is sanding and polishing step by step, and washed with de-ionized water is carried out oil removing with dehydrated alcohol then, puts into electrolyzer after rinsing well with deionized water at last.
Three, experiment test
Instrument: the determining instrument of alternating-current impedance and polarization curve is: the CHI660B electrochemical workstation, the test frequency scope of alternating-current impedance is at 50mHz-100kHz, the actuation signal peak value is 5mV, and the potential range of method of polarization curve is 0.5V～0.15V (vs SCE), and scanning speed is 1mV/s.
Adopt three-electrode system in the experiment, the HSn70-1 brass electrode is a working electrode; Platinum electrode is as supporting electrode; Reference electrode is a saturated calomel electrode.The measurement of alternating-current impedance and polarization curve all is to immerse in the 3%NaCl solution to carry out under open circuit potential behind the 0.5h behind the ATA SAMs of HSn70-1 brass electrode assembling different time.
Four, interpretation
Fig. 1 is that the HSn70-1 brass electrode is 10
-3Time-the potential curve of self assembling process in the ATA solution of mol/L, as seen from the figure, when electrode immerses the self assembling process initial stage in the ATA solution, current potential sharply raises, this may be because the ATA molecule has formed SAMs at electrode surface, make current potential raise, the 500s after potential changes mitigation, the 1000s after potential nearly 100mV that raises, basicly stable about-95mV, illustrate that it is that the HSn70-1 brass electrode of assembling different time ATA SAMs immerses the alternating-current impedance figure (Nyquist figure) (1--blank 2--0.5h 3--1h 4--2h) in the 3%NaC l solution respectively that the ATA molecule easily forms stable ATA SAMs. Fig. 2 in brass surfaces.When having inhibiter in the solution, inhibiter and metal function generate a kind of protective membrane, embody good corrosion mitigating effect.Corresponding ac impedance measurement result is impedance spectrum Fig. 1 (Nyquist figure), and this impedance spectrum all shows an arc, and the chord length of arc to the Z axle is corresponding to the membrane resistance R of electrode
f, R
fThe corrosion mitigating effect of big more inhibiter is good more.As can be seen from Figure 2, along with the time increased last 1 hour from 0 hour, corresponding impedance spectrogram chord length increases, R
fBig more, corrosion mitigating effect is good more, but built-up time surpasses after 1 hour, and the impedance spectrogram is on a declining curve.Therefore built-up time is 1 hour, and corrosion mitigating effect is best.Fig. 3 is that the HSn70-1 brass electrode of assembling different time ATA SAMs immerses polarization curve in the 3%NaCl solution (1--blank 2--0.5h3--1h 4--2h) respectively, and its relevant electrochemical data is listed in table 1 (η=(I wherein
Corr-I '
Corr)/I
Corr, I
Corr, I '
CorrEach represents the corrosion electric current density of unassembled and assembling ATA SAMs electrode in the solution).
The E of table 1 assembling different time brass electrode in 3%NaCl
Cocr, I
CoorWith corrosion inhibition rate η
| Assembled time | E coor/mV | I coor /μA·cm -2 | η/％ |
| blank 0.5h 1h 2h | -634.7 -595.3 -578.6 -554.8 | 33.11 5.754 1.096 3.548 | / 82.62 96.69 89.28 |
The corrosion current of HSn70-1 brass electrode is 33.11 μ Acm during the blank test of 3%NaCl solution as known from Table 1
-2, assembling ATA SAMs 0.5h post-etching electric current reduces, and is 5.754 μ Acm
-2, assembling ATA SAMs 1h post-etching electric current further reduces, and only is 1.096 μ Acm
-2, corrosion inhibition rate is 96.69%, assembling ATA SAMs 2h post-etching electric current raises to some extent, illustrates that ATA has tangible corrosion mitigating effect to the HSn70-1 brass in the 3%NaCl solution.This result meets the conclusion that AC impedence method draws.Can find out also that from polarization curve the ATA inhibiter is shuffled the corrosion potential of HSn70-1 brass electrode in addition, polarization curve takes place obviously to shuffle, and illustrates that compound corrosion inhibitor is an anodic corrosion inhibitor.Showing that from above electrochemical data ATA has good corrosion inhibition for corrosion of metal, is a kind of environmentally friendly efficiently inhibiter, and consumption is low, has higher productive value and vast market prospect.
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 (2)
1. the method at HSn70-1 brass surfaces formation self-composed monomolecular corrosion-proof film comprises the following steps:
A. with HSn70-1 brass earlier through 0#～6# after sanding and polishing, dehydrated alcohol oil removing, deionized water are cleaned step by step, standby;
B. ATA being mixed with concentration is 1 * 10
-3The corrosion inhibitor solution of mol/L;
C. the HSn70-1 brass with above-mentioned processing impregnated in the above-mentioned ATA corrosion inhibitor solution that is mixed with, and dipping temperature is 20～30 ℃, and dipping time is 0.5～2 hour, finally forms ATA self-composed monomolecular corrosion-proof film in the HSn70-1 brass surfaces.
2. according to the described a kind of method at HSn70-1 brass surfaces formation self-composed monomolecular corrosion-proof film of claim 1, it is characterized in that: the dipping time of HSn70-1 brass in the ATA corrosion inhibitor solution is 1 hour among the step c.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710044078 CN101092698A (en) | 2007-07-20 | 2007-07-20 | Method for forming anti corrosion film of self-assembled single molecule on surface of HSn70-1 brass |
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| CN 200710044078 CN101092698A (en) | 2007-07-20 | 2007-07-20 | Method for forming anti corrosion film of self-assembled single molecule on surface of HSn70-1 brass |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268715A (en) * | 2011-08-03 | 2011-12-07 | 上海电力学院 | Self-assembled film with corrosion inhibition performance on brass surface and preparation method thereof |
| CN101613543B (en) * | 2009-07-20 | 2012-05-23 | 北京科技大学 | Method for preparing coating with metal surface corrosion inhibition and self-repair functions |
| CN105714279A (en) * | 2016-03-07 | 2016-06-29 | 上海电力学院 | Preparation method for copper surface corrosion inhibition assembled membrane |
-
2007
- 2007-07-20 CN CN 200710044078 patent/CN101092698A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613543B (en) * | 2009-07-20 | 2012-05-23 | 北京科技大学 | Method for preparing coating with metal surface corrosion inhibition and self-repair functions |
| CN102268715A (en) * | 2011-08-03 | 2011-12-07 | 上海电力学院 | Self-assembled film with corrosion inhibition performance on brass surface and preparation method thereof |
| CN105714279A (en) * | 2016-03-07 | 2016-06-29 | 上海电力学院 | Preparation method for copper surface corrosion inhibition assembled membrane |
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