CN109839348A - A kind of method of quick screening engine cooling liquid formulation - Google Patents
A kind of method of quick screening engine cooling liquid formulation Download PDFInfo
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- CN109839348A CN109839348A CN201711193049.3A CN201711193049A CN109839348A CN 109839348 A CN109839348 A CN 109839348A CN 201711193049 A CN201711193049 A CN 201711193049A CN 109839348 A CN109839348 A CN 109839348A
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Abstract
The present invention relates to a kind of methods of quickly screening engine cooling liquid formulation, corrosion inhibiter is measured using the polarized method of electrochemistry Tafel to the inhibition situation of metal erosion, Tafel polarization and linear polarization test carry out in three-electrode system, obtain different corrosion inhibiter to the slow release effect of different metal by electro-chemical test.The problem of method of the invention can be cycle time 5-6 months by screening, greatly improve engine cooling liquid formulation screening excessive cycle, suitable this field is promoted and applied.
Description
Technical field
The invention belongs to engine cool technical fields, and in particular to a kind of side of quickly screening engine cooling liquid formulation
Method.
Background technique
China's vehicle guaranteeding organic quantity rapid growth in recent years, the car ownership ended in June, 2017 China have reached
To 200,000,000.Engine coolant is consequently increased as a part essential in automobile, demand.However, with vapour
The fast development of turner industry, it is also higher and higher for the quality requirement of automobile engine cooling liquid, in addition to wanting boiling with higher
Except the basic demands such as point and lower freezing point, it is often more important that there is good preventing metal corrosion performance, Cavitation resistant energy
And scale-preventing performance, and the automaker of most countries also proposes strictly the environmental-protecting performance of engine coolant
Research.
Hyundai Motor and its engine develop to lightweight direction, wherein the alloy containing light metals such as aluminium, magnesium, titaniums
Material；Novel alloy Steel material containing elements such as aluminium, silicon；Cast iron materials containing elements such as nickel, chromium, manganese and novel pottery
Porcelain based composites are that have with representative lightweighting materials.In order to cope with the variation of automobile engine material, this requires
Corrosion inhibiter in engine coolant will also improve therewith with the variation of new material in engine, inhibit hair to reach
The purpose of material corrosion in motivation.At present according to the national standard of engine coolant (GB 29743-2013), engine cool
Liquid needs to test by glassware corrosion, simulation is rotten using corrosion test, cast aluminium alloy heat transfer corrosion test and aluminium pump air pocket
Corrosion test, although the corrosion test test of this four great tradition can accurately determine the applicability of engine coolant very much,
Excessive cycle and some uncontrollable factors are also easy to produce in the test period.Therefore, in order to adapt to the fast of engine material
Speed variation, it is necessary to the method that one kind can quickly screen engine cool formula.Even if the method using electrochemistry is added very
A small amount of corrosion inhibiter can obtain this corrosion inhibiter for the effect of corrosion inhibition for metal by the test method of electrochemistry.
Summary of the invention
In order to solve the problems, such as existing engine cooling liquid formulation screening excessive cycle, the present invention provides one kind to send out
Motivation anti-icing fluid formulating initial stage passes through the method that electro-chemical test quickly screens corrosion inhibiter, and the purpose is in engine antif
Formula of liquid research initial stage quickly screens engine cooling liquid formulation and its dosage by the method for electro-chemical test, in order to
It solves the above problems, present invention employs following scheme:
A kind of method of quick screening engine cooling liquid formulation, measures corrosion inhibiter using the polarized method of electrochemistry Tafel
To the inhibition situation of metal erosion, Tafel polarization and linear polarization test carry out in three-electrode system, pass through electro-chemical test
Different corrosion inhibiter are obtained to the slow release effect of different metal.
In specific embodiment of the invention, the method, comprising the following steps:
(1) composition of anti-icing fluid corrosive water: SO4 2-、Cl-And HCO3 -Each 100mmol/L of concentration, remaining is deionized water；
(2) corrosion inhibiter is one of isooctyl acid, succinic acid, decanedioic acid, enuatrol, sodium benzoate or a variety of, further includes lemon
Sour triamine, phytic acid, benzotriazole, Epoxysuccinic acid-epoxy prapanol copolymer, polyacrylamide, neopelex；
(3) concrete operations: Tafel polarization test carries out in three-electrode system, and working electrode chooses cast iron, carbon steel, cast aluminium, aluminium
Magnesium, solder, brass or red copper, and encapsulated with epoxy resin, work area 1cm2；Auxiliary electrode platinum electrode；Reference electrode is full
And calomel electrode, it is connected by salt bridge；Working electrode is gradually polishing to metallographic through sand paper, after acetone and alcohol are cleaned, merging
In engine fluid, carry out testing and screening above-mentioned corrosion inhibiter under the conditions of room temperature and 88 DEG C respectively.
Tafel the polarization m- 1v~+1v of polarized area, scanning speed 1mv/s judge inhibition by icorr and polarization curve
Inhibition efficiency (η) is calculated as follows in the superiority and inferiority of effect:
Wherein, icorr: not plus Tafel is fitted in the solution of corrosion inhibiter corrosion electric current density；
I ' corr: add the corrosion electric current density that Tafel is fitted in the solution of corrosion inhibiter.
Screening technique through the invention obtains enuatrol, benzotriazole, molybdic acid na concn in 100-150ppm just
Corrosion mitigating effect apparent for carbon steel is shown, decanedioic acid concentration can show preferable for carbon steel in 300-1000ppm
The corrosion inhibition rate of corrosion mitigating effect, corrosion inhibiter can achieve 45% or more.The phytic acid and sodium metasilicate of 1000-2000ppm just has cast aluminium
There is good corrosion mitigating effect, but decanedioic acid needs to have cast aluminium preferable corrosion mitigating effect in 3000-4000ppm, on
The sustained release rate for stating corrosion inhibiter can achieve 75% or so.The benzotriazole of 1-3ppm just has brass and red copper good slow
Release effect.The decanedioic acid of adipic acid, 3000-4000ppm containing 1000-1200ppm, 1000-1500ppm benzoic acid,
The benzotriazole of 500-800ppm and the sodium phytate of 500-100ppm are for carbon steel, cast iron, scolding tin, cast aluminium, brass and red copper
All there is preferable slow releasing function, the synthesis inhibition efficiency of the compound prescription can achieve 85% or more.Compared with prior art,
Screening technique of the invention can be cycle time 5-6 months by screening, greatly improve engine cooling liquid formulation screening week
Phase too long problem, suitable this field is promoted and applied.
Detailed description of the invention
It is further described with reference to the accompanying drawing:
Fig. 1 is a kind of schematic device that inhibition agent method is quickly screened by electro-chemical test of the invention；
Fig. 2 is the Tafel curve graph of the Electrochemical results of embodiment 2 in the present invention.
Specific embodiment
Below by embodiment, the present invention will be further described.
Embodiment 1
The screening of the single single corrosion inhibiter of metal, sequentially includes the following steps:
(1) composition of anti-icing fluid corrosive water: SO4 2-、Cl-And HCO3 -Each 100mmol/L of concentration, remaining is deionized water；
(2) type of corrosion inhibiter: isooctyl acid, succinic acid, decanedioic acid, enuatrol, sodium benzoate etc., further include triammonium citrate,
Phytic acid, benzotriazole, Epoxysuccinic acid-epoxy prapanol copolymer, polyacrylamide, neopelex；
(3) concrete operations: Tafel polarization test carries out (see attached drawing 1) in three-electrode system, and working electrode chooses conventional casting
Iron, carbon steel, cast aluminium, magnalium, solder, brass and red copper, and encapsulated with epoxy resin, work area 1cm2；Auxiliary electrode platinum electricity
Pole；Reference electrode is saturated calomel electrode, is connected by salt bridge；Working electrode is gradually polishing to metallographic through sand paper, through acetone and
After alcohol is cleaned；It carries out testing and screening above-mentioned corrosion inhibiter under the conditions of room temperature and 88 DEG C respectively.
The slow release effect of embodiment 1: enuatrol, benzotriazole, molybdic acid na concn are just shown in 100-150ppm
Corrosion mitigating effect apparent for carbon steel, decanedioic acid concentration can show inhibition effect preferable for carbon steel in 300-1000ppm
The corrosion inhibition rate of fruit, above-mentioned corrosion inhibiter can achieve 45% or more；The phytic acid and sodium metasilicate of 1000-2000ppm just has cast aluminium
Good corrosion mitigating effect, but decanedioic acid needs to have cast aluminium preferable corrosion mitigating effect in 3000-4000ppm, it is above-mentioned
The sustained release rate of corrosion inhibiter can achieve 75% or so；The benzotriazole of 1-3ppm just has good sustained release to brass and red copper
Effect.
Embodiment 2
The screening of composite corrosion inhibitor, sequentially includes the following steps:
Embodiment 2 carries out review screening difference from example 1 is that the not single screening of the type of corrosion inhibiter.
Other are same as the specific embodiment one.
The slow release effect of embodiment 2: decanedioic acid, the 1000- of adipic acid, 3000-4000ppm containing 1000-1200ppm
The sodium phytate of the benzoic acid of 1500ppm, the benzotriazole of 500-800ppm and 500-100ppm for carbon steel, cast iron, scolding tin,
Cast aluminium, brass and red copper all have preferable slow releasing function, and the synthesis inhibition efficiency of the compound prescription can achieve 85% or more.
Above in conjunction with embodiment, an exemplary description of the invention, it is clear that realization of the invention is not by above-mentioned reality
The limitation of example is applied, as long as using the various improvement that the inventive concept and technical scheme of the present invention carry out, or not improved by this
The conception and technical scheme of invention directly apply to other occasions, are within the scope of the invention.
Claims (5)
1. a kind of method of quickly screening engine cooling liquid formulation, which is characterized in that use the polarized method of electrochemistry Tafel
It carries out, leads in three-electrode system to measure corrosion inhibiter to the inhibition situation of metal erosion, Tafel polarization and linear polarization test
It crosses electro-chemical test and obtains different corrosion inhibiter to the slow release effect of different metal.
2. the method according to claim 1, wherein the following steps are included:
(1) composition of anti-icing fluid corrosive water: SO4 2-、Cl-And HCO3 -Each 100mmol/L of concentration, remaining is deionized water；
(2) corrosion inhibiter is one of isooctyl acid, succinic acid, decanedioic acid, enuatrol, sodium benzoate or a variety of, further includes lemon
Sour triamine, phytic acid, benzotriazole, Epoxysuccinic acid-epoxy prapanol copolymer, polyacrylamide, neopelex；
(3) concrete operations: Tafel polarization test carries out in three-electrode system, and working electrode chooses cast iron, carbon steel, cast aluminium, aluminium
Magnesium, solder, brass or red copper, and encapsulated with epoxy resin, work area 1cm2；Auxiliary electrode platinum electrode；Reference electrode is full
And calomel electrode, it is connected by salt bridge；Working electrode is gradually polishing to metallographic through sand paper, after acetone and alcohol are cleaned, merging
In engine fluid, carry out testing and screening above-mentioned corrosion inhibiter under the conditions of room temperature and 88 DEG C respectively.
3. the m- 1v~+1v of polarized area the method according to claim 1, wherein Tafel polarizes, scanning speed
1mv/s judges the superiority and inferiority of corrosion mitigating effect by icorr and polarization curve, and inhibition efficiency (η) is calculated as follows:
Wherein, icorr: not plus Tafel is fitted in the solution of corrosion inhibiter corrosion electric current density；
I ' corr: add the corrosion electric current density that Tafel is fitted in the solution of corrosion inhibiter.
4. method according to any one of claim 1-3, which is characterized in that obtain enuatrol, benzo by this method
Triazole, molybdic acid na concn just show corrosion mitigating effect apparent for carbon steel in 100-150ppm, and decanedioic acid concentration exists
300-1000ppm can show corrosion mitigating effect preferable for carbon steel, and the corrosion inhibition rate of corrosion inhibiter can achieve 45% or more；
The phytic acid and sodium metasilicate of 1000-2000ppm just has cast aluminium good corrosion mitigating effect, but decanedioic acid is needed in 3000-
4000ppm could have cast aluminium preferable corrosion mitigating effect, and the sustained release rate of above-mentioned corrosion inhibiter can achieve 75% or so；1-3ppm
Benzotriazole just there is good slow release effect to brass and red copper.
5. method according to any one of claim 1-3, which is characterized in that obtained by this method containing 1000-
The adipic acid of 1200ppm, the decanedioic acid of 3000-4000ppm, the benzoic acid of 1000-1500ppm, 500-800ppm benzo three
The sodium phytate of nitrogen azoles and 500-100ppm all there is preferable sustained release to make carbon steel, cast iron, scolding tin, cast aluminium, brass and red copper
With synthesis inhibition efficiency can achieve 85% or more.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110424016A (en) * | 2019-08-26 | 2019-11-08 | 中国特种设备检测研究院 | A kind of compound corrosion inhibitor preparation method suitable for producing synthesis gas from coal |
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Application publication date: 20190604 |