CN100500943C - Green environment-friendly type inhibitor for HSn70-1 brass - Google Patents
Green environment-friendly type inhibitor for HSn70-1 brass Download PDFInfo
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- CN100500943C CN100500943C CNB2007100413396A CN200710041339A CN100500943C CN 100500943 C CN100500943 C CN 100500943C CN B2007100413396 A CNB2007100413396 A CN B2007100413396A CN 200710041339 A CN200710041339 A CN 200710041339A CN 100500943 C CN100500943 C CN 100500943C
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- brass
- hsn70
- inhibiter
- corrosion
- phytic acid
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Abstract
The invention discloses a green environment protective inhibitor of HSn70-1 brass, which is compounded by sodium tungstate and phytic acid, wherein the density of sodium tungstate is 10-30mg/L and the density of phytic acid is 10-30mg/L and the total density of inhibitor solution is 40mg/L; the inhibitor displays optimum effect when the density rate of sodium tungstate and phytic acid is 1: 3. The corrosion current of brass is reduced greatly when 3%NaCl solution is added into 40mg/L inhibitor with inhibiting efficiency at 85. 47.
Description
Technical field
The present invention relates to a kind of inhibiter that prevents, delays metallic corrosion, more particularly relate to a kind of environment-friendly corrosion inhibitor of the HSn of being used for 70-1 brass.
Background technology
Metallic corrosion is that the corrosive medium of metal in environment had an effect and made metal become the thermodynamics spontaneous process of the state of oxidation.According to the literature, the annual financial loss that causes owing to metallic corrosion can account for 1.5～2.4% of state's gross national product.In order to tackle metallic corrosion, people have used increasing inhibiter, but the inhibiter great majority of using at present are not the inhibiter of environmental protection, more or less can produce harm to environment.China is tungsten resource big country, the tungsten reserves account for more than 51% of world's total reserves, and tungsten compound is almost non-toxic, and the water coolant of tungstenic can not pollute surrounding environment, human body and crop, also do not cause that the microorganism evil is living, so tungstate is a kind of water treatment corrosion inhibitors of environmental protection.Studies show that containing tungsten corrosion inhibitor all has corrosion inhibition to carbon steel, red copper, copper alloy, aluminium, zinc.Phytic acid is phytic acid (PA), has distinctive molecular structure, physico-chemical property and Nantural non-toxic characteristic, obtains more and more widely application at numerous areas such as food, medicine, chemical industry, metallurgy, machinery and environmental protection.Phytic acid is to Fe
3+, Cu
2+, Zn
2+, Ca
2+Deng strong especially sequestering power is arranged, can form the huge legendary turtle compound attached to the prevention metallic corrosion of metal vessel surface, environmental pollution is few, also is a kind of inhibiter and Scale inhibitors of environmental protection.At present, the application to these two kinds of inhibiter has both at home and abroad all had certain research, but sodium wolframate and phytic acid composite being used for are not seen in report as yet to the Corrosion Inhibition of HSn70-1 brass.
Summary of the invention
Technical problem to be solved by this invention provides a kind of sodium wolframate and composite efficient, the environment-friendly type metal inhibiter that are applicable to HSn70-1 brass of phytic acid.
The technical solution used in the present invention: a kind of environment-friendly corrosion inhibitor that is used for HSn70-1 brass, mix by sodium wolframate and phytic acid, wherein the concentration of sodium wolframate is 10～30mg/L, and the concentration of phytic acid is 10～30mg/L, and the total concn of corrosion inhibitor solution is 40mg/L.
When the concentration ratio of sodium wolframate and phytic acid is 1:3, the inhibiter best results.
The beneficial effect of the invention, inhibiter of the present invention are by sodium wolframate and phytic acid is composite forms, and inhibiter green, environmental protection do not have harm to environment.Effect after two kinds of composite uses of inhibiter component is better than the effect of the single use of wherein any inhibiter.Electrochemical data shows that the corrosion current of brass reduces greatly behind the compound corrosion inhibitor of adding 40mg/L, only is 2.706 μ Acm
-2, inhibition efficiency is about 85.47.Inhibiter of the present invention has tangible corrosion mitigating effect to the brass in the 3%NaCl solution, and two kinds of inhibiter in the prescription have been brought into play the inhibition synergistic effect.
Description of drawings
Fig. 1 is that the HSn70-1 brass electrode immerses the alternating-current impedance figure (Nyquist figure) in the 3%NaCl solution that contains different inhibiter respectively;
Fig. 2 is that the HSn70-1 brass electrode immerses the alternating-current impedance figure (Bode figure) in the 3%NaC l solution that contains different inhibiter respectively;
Fig. 3 is that the HSn70-1 brass electrode immerses polarization curve in the 3%NaCl solution that contains different inhibiter respectively.
Embodiment
Below by accompanying drawing the present invention is described in further detail, a kind of environment-friendly corrosion inhibitor that is used for HSn70-1 brass is mixed by sodium wolframate and phytic acid, and wherein the concentration of sodium wolframate is 10～30mg/L, the concentration of phytic acid is 10～30mg/L, and the total concn of corrosion inhibitor solution is 40mg/L.When the concentration ratio of sodium wolframate and phytic acid is 1:3, the inhibiter best results.
Embodiment
One, solution preparation
Sodium wolframate (analytical pure): molecular formula is Na
2WO
4, white crystal, soluble in water.
Phytic acid PA (analytical pure): molecular weight is 660.08, and colourless or weak yellow liquid belongs to nontoxic level.
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 (copper zinc alloy)
Brass electrode (copper zinc alloy) selects for use the HSn70-1 brass material to test.The brass electrode non-working surface is made with epoxy sealing.Electrode area is 0.35cm
-2, 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 PAPCM283 potentiostat, the PARC1025 spectrum analyzer, software kit is PARCM398, PARCM352, the test frequency scope of alternating-current impedance is at 50mHz～100kHz, the actuation signal peak value is 5mV, and the scanning speed of method of polarization curve is 1mV/s.Adopt three-electrode system in the experiment, brass electrode is a working electrode; Platinum electrode is as supporting electrode; Reference electrode is that biliquid connects saturated calomel electrode.The measurement of alternating-current impedance and polarization curve all is to immerse in the 3%NaCl solution that contains various concentration inhibiter at brass electrode to carry out under open circuit potential behind the 0.5h.During test electrode is vertically immersed in the detected solution, the degree of depth of immersed in liquid level and reference electrode, supporting electrode are identical, are about 2cm.
Fig. 1 is that the HSn70-1 brass electrode immerses the alternating-current impedance figure after 0.5h hour in the 3%NaCl solution contain different inhibiter (on behalf of blank, 2, curve 1 represent 40mg/L Na
2WO
4, 3 represent 40mg/LPA, 4 to represent 10mg/L Na
2WO
4+ 20mg/L PA).When having inhibiter in the solution, inhibiter and metal function generate a kind of protective membrane, embody corrosion mitigating effect.Corresponding ac impedance measurement result is impedance spectrogram (Nyquist figure), and this impedance spectrum all shows a flat circle, and the chord length of flat circle 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.Can find out among Fig. 1 that single sodium wolframate, single PA and compound corrosion inhibitor and blank compare HSn70-1 brass all certain corrosion inhibition, PA and sodium wolframate are with the composite R of 3:1
fMaximum, corrosion mitigating effect the best.
Fig. 2 is that the HSn70-1 brass electrode immerses in the 3%NaCl solution contain different inhibiter the figure of the alternating-current impedance (Bode) after 0.5h hour (on behalf of blank, 2, curve 1 represent 40mg/L Na
2WO
4, 3 represent 40mg/L PA, 4 to represent 10mg/L Na
2WO
4+ 30mg/LPA).The corrosion resisting property of electrode can be by the modulus of impedance value of low frequency | and Z| characterizes, the modulus of impedance value | Z| is big more, then the corrosion mitigating effect of electrode is good more, also single as can be seen sodium wolframate, single PA and compound corrosion inhibitor and blank compare HSn70-1 brass from Fig. 2 all certain corrosion inhibition, with compound prescription | and Z|
0.05Maximum, corrosion mitigating effect the best.
Fig. 3 is that HSn70-1 brass immerses the polarization curve behind the 0.5h in the 3%NaCl solution that contains different inhibiter respectively (that curve 1 is represented is blank, 2 represent 40mg/L Na
2WO
4, 3 represent 40mg/L PA, 4 to represent 10mg/L Na
2WO
4+ 30mg/L PA), its relevant electrochemical data is listed in table 1 (η=(I wherein
Corr-I '
Corr)/I
Corr, I
Corr, I '
CorrEach represents not add in the solution and add the corrosion electric current density of inhibiter electrode).Table 1HSn70-1 brass 0.5h corrosion potential, corrosion electric current density and inhibition counting rate meter in containing different inhibiter 3%NaCl solution.
Table 1
The corrosion current of HSn70-1 brass electrode is 18.62 μ Acm during the blank test of 3%NaCl solution as known from Table 1
-2, add 40mg/L Na
2WO
4The post-etching electric current reduces, and is 4.349 μ Acm
-2, add 40mg/L PA post-etching electric current and also reduce, be 5.776 μ Acm
-2, adding 10mg/L Na
2WO
4Obviously reduce with the compound corrosion inhibitor post-etching electric current of 30mg/L PA, 2.706 μ Acm are only arranged
-2, corrosion inhibition rate is 85.47%, illustrates that PA and sodium wolframate are composite HSn70-1 brass in the 3%NaCl solution is had tangible corrosion mitigating effect, and has the inhibition synergistic effect.This result meets the conclusion that AC impedence method draws.Can find out also from polarization curve that in addition adding behind the compound corrosion inhibitor corrosion potential of HSn70-1 brass electrode shuffles, anodic polarization curves takes place obviously to shuffle, and illustrates that compound corrosion inhibitor is an anodic corrosion inhibitor.
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. an environment-friendly corrosion inhibitor that is used for HSn70-1 brass is mixed by sodium wolframate and phytic acid, and wherein the concentration of sodium wolframate is 10～30mg/L, and the concentration of phytic acid is 10～30mg/L, and the total concn of corrosion inhibitor solution is 40mg/L.
2. inhibiter according to claim 1 is characterized in that: the concentration ratio of sodium wolframate and phytic acid is 1:3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100413396A CN100500943C (en) | 2007-05-28 | 2007-05-28 | Green environment-friendly type inhibitor for HSn70-1 brass |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100413396A CN100500943C (en) | 2007-05-28 | 2007-05-28 | Green environment-friendly type inhibitor for HSn70-1 brass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101058885A CN101058885A (en) | 2007-10-24 |
| CN100500943C true CN100500943C (en) | 2009-06-17 |
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ID=38865188
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100413396A Expired - Fee Related CN100500943C (en) | 2007-05-28 | 2007-05-28 | Green environment-friendly type inhibitor for HSn70-1 brass |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268676A (en) * | 2011-08-03 | 2011-12-07 | 上海电力学院 | Environment-friendly compounded corrosion inhibitor for yellow brass and application thereof |
| CN103388148B (en) * | 2013-07-22 | 2015-09-30 | 上海电力学院 | A kind of Pure copper corrosion inhibitor |
| CN103484868B (en) * | 2013-09-23 | 2016-01-20 | 无锡阳工机械制造有限公司 | A kind of non-ferrous metal inhibiter |
| CN109839348A (en) * | 2017-11-24 | 2019-06-04 | 北京蓝星清洗有限公司 | A kind of method of quick screening engine cooling liquid formulation |
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2007
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|---|---|
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Granted publication date: 20090617 Termination date: 20130528 |