CN105543864B - The method for preparing carbon steel pickling solution as corrosion inhibiter using low molecular weight sunflower disk pectin - Google Patents
The method for preparing carbon steel pickling solution as corrosion inhibiter using low molecular weight sunflower disk pectin Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/063—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors heterocyclic compounds
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
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Abstract
The present invention relates to the methods for preparing carbon steel pickling solution as corrosion inhibiter using low molecular weight sunflower disk pectin, belong to metallic material corrosion and protection technology field.The method is used as carbon steel pickling corrosion inhibitor with low molecular weight sunflower disk pectin, is solvent application and preparation low molecular weight sunflower disk pectin as the carbon steel pickling solution of corrosion inhibiter using water using hydrochloric acid solution as carbon steel pickling solution.The mass concentration of the sunflower disk pectin is 0.1~2g/L, and the molar concentration of hydrochloric acid is 0.5~2mol/L.Low molecular weight sunflower disk pectin is used as carbon steel pickling corrosion inhibitor by the present invention, has the characteristics that wide at low cost, source, easily biological-degradable, nontoxic and efficient, to be applied to metal erosion and protect field, have a vast market foreground and application value.
Description
Technical field
The present invention relates to the methods for preparing carbon steel pickling solution as corrosion inhibiter using low molecular weight sunflower disk pectin, belong to metal
Material corrosion and protection technology field.
Background technology
Carbon steel is widely used in building, bridge, railway, vehicle and ship because of its mechanical property at low cost and excellent
The various machine building industries such as oceangoing ship.But carbon steel product is in use, due to its active chemical property and use environment
Complexity so that carbon steel frequently suffers from different degrees of corrosion.Function is used in order to restore it, it is rotten to clean removal frequently with strong acid
Lose product and dirt.But easily occur " cross and lose " during using corrosions product, the dirts such as strong acid cleaning carbon steel
Phenomenon has also corroded part metals base material while removing corrosion product, cause the serious wasting of resources and environment
Pollution.Therefore in pickling carbon steel often using addition corrosion inhibiter as anti-corrosion measure.The restrainer being often used at present is most
For the organic matter of phosphorous, sulphur, nitrogen and oxygen element.However, this kind of corrosion inhibiter is shown in use, toxic, dosage is big and right
The shortcomings such as environmental hazard.With the continuous improvement of people's environmental consciousness, new and effective, less toxic or nontoxic environment friend is found
Good type corrosion inhibiter has become the research hotspot of the following corrosion inhibiter.
China has a large amount of sunflower disk waste residue to be discharged every year, these waste residues are often only used as production biogas, feed in rural area
Or as waste returning to the field.It is substantially all burnt up as fuel in the north or is discarded in field and be allowed to rot, cause material
Waste and environmental pollution.
With going deep into for Recent study work, the purposes of pectin is continuously developed out, and development potentiality is huge, has
Vast market prospect.By sunflower plate exploitation at extraction pectin corrosion inhibiter new raw material, to low molecular weight pectin therein into
Row develops and uses, and can not only increase the added value of sunflower, the raw material sources of abundant pectin production, to conservation of nature ecological environment
It is also had practical significance and social effect with social benefit is improved.
Using low molecular weight sunflower disk pectin as a kind of carbon steel corrosion inhibitor, inhibit steel corrosion in acid condition, so far also
There is not been reported.
Invention content
Toxic and the shortcomings that environmental hazard for traditional corrosion inhibiter, the present invention provides a kind of low molecular weight sunflower disk pectin
Application, by low molecular weight sunflower disk pectin be used as carbon steel pickling corrosion inhibitor.The present invention is to the pectin resource in sunflower disk waste residue
It extracts and develops and uses, be applied to the inhibition protection to corrosion of carbon steel, certain economic benefit can not only be generated,
It can also solve the problems, such as waste pollution, preserve the ecological environment that there is great social benefit and environmental benefit.
The present invention is achieved by the following technical solutions：
A method of carbon steel pickling solution being prepared for corrosion inhibiter using low molecular weight sunflower disk pectin, the method is with low
Molecular weight sunflower disk pectin is used as carbon steel pickling corrosion inhibitor, using hydrochloric acid solution as carbon steel pickling solution, is obtained by solvent preparation of water
It obtains using the carbon steel pickling solution that low molecular weight sunflower disk pectin is corrosion inhibiter.
Further, the method is specifically to prepare low molecular weight sunflower disk pectin first using sunflower disk as raw material
Powder dissolves the low molecular weight sunflower disk pectin powder by solvent of water, prepares low molecular weight sunflower disk pectin solution,
Then it hydrochloric acid solution and water is added into the low molecular weight sunflower disk pectin solution prepares and described apply low molecular weight
Sunflower disk pectin is the carbon steel pickling solution of corrosion inhibiter.
Further, the preparation of the low molecular weight sunflower disk pectin powder includes the following steps：
(1) sunflower disk is washed with deionized water only, is dried in 100 DEG C of vacuum drying chamber, is ground using pulverizer
Sunflower disk after broken drying crosses 60 mesh sieve, obtains sunflower disk powder；
(2) the sunflower disk powder and water obtained step (1) is according to 1:20~1:25 solid-to-liquid ratio mixing, to mixing
Citric acid solution is added in system afterwards, the pH of regulation system is added mass fraction into system and is to 5~5.5
1.5%~2% cellulase, 3.5~4h of constant temperature oscillation at a temperature of 55 DEG C~60 DEG C obtain extracting solution, by the extraction
Liquid is placed in 5min in 90 DEG C of hot water, is centrifuged after enzyme deactivation, after supernatant crosses sand core funnel, in 4 DEG C of short-term preservations.
(3) by the pectin extracting soln refrigerated in step (2) and the acidic ethanol of 4 DEG C of refrigeration according to volume ratio 1:2.5 mixing,
It is sufficiently stirred, is stood under the conditions of 4 DEG C, pectin is made fully to be precipitated, filter to obtain pectin with 200 mesh nylon filtering cloths, then washed with ethyl alcohol
It washs 3 times, in 60 DEG C of drying, with mortar grinder at powder, obtains the low molecular weight sunflower disk pectin powder；
The method for preparing the low molecular weight sunflower disk pectin solution is：Into the low molecular weight sunflower disk pectin powder
Water, heating stirring is added, heating temperature is 40 DEG C, rotating speed 500r/min, until stopping stirring after pectin complete swelling.
Further, it is described using low molecular weight sunflower disk pectin be corrosion inhibiter carbon steel pickling solution in, it is described low
The mass concentration of molecular weight sunflower disk pectin is 0.1~2g/L, and the molar concentration of hydrochloric acid is 0.5~2mol/L.
Further, the weight average molecular weight of the low molecular weight sunflower disk pectin is 5~12KDa, and number-average molecular weight is
650。
Further, the esterification degree of the low molecular weight sunflower disk pectin is 20.01%~32.52%, galacturonic
Acid content is 70~80%.
Further, at 25 DEG C, by pretreated 45#Carbon steel test piece is placed on the application low molecular weight sunflower disk fruit
Glue be corrosion inhibiter carbon steel pickling solution in impregnate 48h, the low molecular weight sunflower disk pectin pair 45#Carbon steel inhibition efficiency is
86.92%~95.99%.
A kind of carbon steel pickling corrosion inhibitor, the corrosion inhibiter are low molecular weight sunflower disk pectin.
Further, the weight average molecular weight of the low molecular weight sunflower disk pectin is 5~12KDa, and number-average molecular weight is
650。
Further, the esterification degree of the low molecular weight sunflower disk pectin is 20.01%~32.52%, galacturonic acid
Content is 70%~80%.
The advantageous effects of the present invention：
1. low molecular weight sunflower disk pectin of the present invention is extracted from sunflower plate residue, in sunflower disk waste residue
Pectin resource extract and develop and use, be applied to the inhibition protection to corrosion of carbon steel, can not only generate certain
Economic benefit, can also solve the problems, such as waste pollution, preserve the ecological environment, have great social benefit and environmental benefit.
2. low molecular weight sunflower disk pectin of the present invention is the polymer substance being polymerized by D- galacturonic acids, tool
There are the biology performances such as degradable, nontoxic, is a kind of corrosion inhibiter of safe green.
3. low molecular weight sunflower disk pectin of the present invention is used as carbon steel pickling corrosion inhibitor, dosage is few, and inhibition efficiency is high.
Description of the drawings
The infrared spectrum of Fig. 1 low molecule sunflower plate pectin；
Nyquist figure of Fig. 2 carbon steel electrodes in the pickling solution for being not added with and adding various concentration corrosion inhibiter；
Dynamic potential polarization curve of Fig. 3 carbon steel electrodes in the pickling solution for being not added with and adding various concentration corrosion inhibiter
Figure；
Fig. 4 impregnated without pickling solution 45#The high-power microscope figure of carbon steel test piece；
Fig. 5 are at 25 DEG C, after not adding the concentration of hydrochloric acid of any corrosion inhibiter to impregnate 48h in the pickling solution of 2mol/L
45#Carbon steel test piece high-power microscope figure；
Fig. 6 are at 25 DEG C, concentration of hydrochloric acid 2mol/L, and sunflower disk pectin corrosion inhibiter adds the pickling of a concentration of 2g/L
45 after 48h are impregnated in solution#100 times of figures of carbon steel test piece high-power microscope resolution ratio.
Fig. 7 are at 25 DEG C, concentration of hydrochloric acid 2mol/L, and sunflower disk pectin corrosion inhibiter adds the pickling of a concentration of 2g/L
45 after 48h are impregnated in solution#500 times of figures of carbon steel test piece high-power microscope resolution ratio.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any replacement done in the spirit and scope of the present invention being defined by the claims, repaiies
Change, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to the thin of the present invention
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
Description can also understand the present invention completely.
Embodiment 1
A method of carbon steel pickling solution being prepared for corrosion inhibiter using low molecular weight sunflower disk pectin, the method is with low
Molecular weight sunflower disk pectin is used as carbon steel pickling corrosion inhibitor, using hydrochloric acid solution as carbon steel pickling solution, is answered by solvent preparation of water
With the carbon steel pickling solution that low molecular weight sunflower disk pectin is corrosion inhibiter.And it has studied and utilizes the application low molecular weight sunflower disk
Corrosion mitigating effect when pectin is the carbon steel pickling solution progress pickling of corrosion inhibiter.
One, the method for preparing the pickling solution of the sunflower disk pectin corrosion inhibiter containing various concentration and different concentration of hydrochloric acid
1. the preparation process of low molecular weight sunflower disk pectin：
(1) sunflower disk is washed with deionized water only, is dried in 100 DEG C of vacuum drying chamber, is ground using pulverizer
Sunflower disk after broken drying is crossed 60 mesh sieve, obtains sunflower disk powder.
(2) the sunflower disk powder and water obtained step (1) is according to 1:20~1:25 solid-to-liquid ratio mixing, to mixing
Citric acid solution is added in system afterwards, 1.5%~2% (matter is added into system to 5~5.5 by the pH of regulation system
Measure score) cellulase, 3.5~4h of constant temperature oscillation at a temperature of 55 DEG C~60 DEG C, obtain extracting solution, extracting solution is placed in 90
DEG C hot water in 5min, centrifuged after enzyme deactivation, after supernatant crosses sand core funnel (No. G3), in 4 DEG C of short-term preservations.
(3) by the pectin extracting soln refrigerated in step (2) and the acidic ethanol of 4 DEG C of refrigeration according to volume ratio 1:2.5 mixing,
It is sufficiently stirred, is stood under the conditions of 4 DEG C, pectin is made fully to be precipitated, pectin is filtered to obtain with 200 mesh nylon filtering cloths.It is washed again with ethyl alcohol
It washs 3 times, in 60 DEG C of drying, with mortar grinder at powder, obtains low molecular weight sunflower disk pectin powder.
Pectin is by D- galacturonic acids with natural high molecular substance made of α-Isosorbide-5-Nitrae glycosidic bond links, and structural formula is such as
Under：
Structural analysis is carried out to low molecule sunflower disk pectin powder sample using Fourier infrared spectrograph, result is as schemed
Shown in 1.3411.49cm-1The broad peak at place is the stretching vibration absworption peak of O-H, 2929.92cm-1Left and right peak by C-H (including：
CH、CH2And CH3) stretching vibration absorb caused by, 1733.28cm-1And 1608.26cm-1The carbonyl and non-ester being respectively esterified
The carbonyl vibration absorption peak of change, 1249.29cm-1Caused by being the asymmetric stretching vibration by C-O-C, show-O-CH3Deposit
.FTIR spectrum analysis further demonstrates in sunflower disk pectin molecule containing a large amount of carboxyl, hydroxyl and ester group etc.
Functional group, these functional groups can be coordinated with metallic element, be adsorbed on carbon steel surface, protective film be formed, to prevent corrosive medium
It is contacted with carbon steel surface, slows down corrosion.
2. the method for preparing the pickling solution of the sunflower disk pectin corrosion inhibiter containing various concentration and different concentration of hydrochloric acid
(1) take 15 beakers, every five one group, be separately added into every group of 5 beakers 0g, 0.01g, 0.05g,
Low molecular weight sunflower disk pectin powder described in 0.1g, 0.2g, adds 50mL distilled water, heating stirring, rotating speed 500r/min,
Temperature is 40 DEG C, until pectin complete swelling, is made the pectin solution of various concentration.
(2) first groups of processing methods are：By the pectin solution of one group of 5 various concentration prepared in step (1), divide
It is not transferred in 5 100mL volumetric flasks, concentrated hydrochloric acid that 4.85mL mass fractions are 36% is added and (or 4.6mL mass point is added
The concentrated hydrochloric acid that number is 38%), it is settled to 100mL with distilled water, is shaken up, the sunflower disk pectin corrosion inhibiter containing various concentration is obtained
Pickling solution, prepare it is described using low molecular weight sunflower disk pectin be corrosion inhibiter carbon steel pickling solution in, institute
Low molecular weight sunflower disk pectin quality a concentration of respectively 0g/L, 0.1g/L, 0.5g/L, 1g/L, 2g/L are stated, at this point, hydrochloric acid
Molar concentration is 0.5mol/L；
Second group of processing method is identical as first group of preparation method step, only the difference is that, the mass fraction of addition
Volume for 36% concentrated hydrochloric acid is 9.7mL (or the concentrated hydrochloric acid that 9.2mL mass fractions are 38% is added), what is prepared
It is described using low molecular weight sunflower disk pectin be corrosion inhibiter carbon steel pickling solution in, the molar concentration of hydrochloric acid is 1mol/L；
Third group processing method is identical as first group of preparation method step, only the difference is that, the mass fraction of addition
Volume for 36% concentrated hydrochloric acid is 19.4mL (or the concentrated hydrochloric acid that 18.4mL mass fractions are 38% is added), is being prepared
It is described using low molecular weight sunflower disk pectin be corrosion inhibiter carbon steel pickling solution in, the molar concentration of hydrochloric acid is 2mol/L；
Two, the sunflower disk pectin corrosion inhibiter containing various concentration and the pickling solution of different concentration of hydrochloric acid, research are utilized
Corrosion mitigating effect of the low molecule sunflower disk pectin as pickling carbon steel corrosion inhibitor.
1. studying corrosion mitigating effect of the low molecular weight sunflower disk pectin to carbon steel using static weightless test.
According to GB10124-88《Metal material laboratory homogeneous corrosion soaks experimental method entirely》Carry out weightless test.This experiment
Used 45#The size of carbon steel test piece is 20mm × 10mm × 2mm, and surface is successively with 100#~2000#Water phase sand paper is beaten
Mill then uses deionized water, acetone and washes of absolute alcohol, last cold wind drying to weigh, wherein 45#Carbon steel is that carbon content exists
0.45% carbon structural steels, also known as 45 carbon junction steels, belong to medium carbon steel.
Under 25 DEG C of constant temperature, processed carbon steel test piece is placed in above-mentioned steps and is prepared containing different dense
48h is impregnated in the pickling solution of the sunflower disk pectin corrosion inhibiter difference concentration of hydrochloric acid of degree, then takes out test piece, is cleaned dry
It is dry, with scales/electronic balance weighing, its inhibition efficiency, corrosion rate (R) and inhibition efficiency (EI are calculated according to the weight loss of test piece
(%)) calculation formula is as follows：
In formula：
W0：Not soaking carbon steel test piece quality (g)；
W1：Carbon steel impregnates the quality (g) after 48h in corrosive medium；
A：Carbon steel strip accumulates (mm2)；
t：Carbon steel soaking time (48h) in corrosive medium；
RBlank：It is not added with the corrosion of carbon steel rate of corrosion inhibiter；
RCorrosion inhibiter：Add the corrosion of carbon steel rate of various concentration corrosion inhibiter.
Weightless test the results are shown in Table 1：It is found that at 25 DEG C, in pickling solution concentration of hydrochloric acid be 0.5mol/L, 1mol/L,
When 2mol/L, corresponding best efficiency of corrosion inhibitors is respectively：86.92%, 92.23%, 95.99%, inhibition efficiency is above 85%,
Show that low molecule sunflower disk pectin is a kind of efficient corrosion inhibiter.In three kinds of different concentration of hydrochloric acid, the hydrochloric acid solution of 2mol/L
Middle acquisition inhibition efficiency is up to 95.99%, can be with this is because pectin is degraded in concentrated hydrochloric acid molecules in solution chain
It is oriented in carbon steel surface and forms adsorbed film, and mutually wind small, less salt acid concentration depolymerized pectin molecular weight is weak, and strand largely twines
Around together, pectin molecule can be interfered to the absorption on carbon steel surface, therefore the sunflower disk pectin inhibition in high salt concentration acid solution
The inhibition efficiency of agent is higher than the inhibition efficiency of sunflower disk pectin corrosion inhibiter in low concentration of salt acid solution.
Pickling solution pickling of 1 carbon steel of table in sunflower disk pectin corrosion inhibiter difference concentration of hydrochloric acid containing various concentration
Weightless result
2. using Electrode with Electrochemical Impedance Spectroscopy research low molecular weight sunflower disk pectin to the corrosion mitigating effect of carbon steel
Using epoxy resin by 45#Carbon steel electrode non-active area seals, work area 1cm2.Electrode table before test
Face is with 100#~2000#Sand paper is polished step by step, then uses 1#~3#Abrasive paper for metallograph polishes, acetone and alcohol degreasing, then spend from
Sub- water is put into electrolytic cell after rinsing well and is tested.
Electro-chemical test is carried out by electrochemical workstation.It is saturation calomel that experiment, which uses three-electrode system, reference electrode,
Electrode (SCE), auxiliary electrode are platinum electrode, and working electrode is above-mentioned 45#Carbon steel.By above-mentioned 45#Carbon steel test piece is put into electrolytic cell
In, after open-circuit voltage stabilization, test dynamic potential polarization curve and ac impedance spectroscopy.Potentiodynamic polarization sweep speed is 1mV/s,
Scanning range is：- 1~0.2V, the fitting software carried using work station are fitted.
Electrochemical impedance scan frequency is 10mHz~100kHz, and sine wave disturbance signal amplitude is 5mV, is used
ZsimpWin softwares carry out analysis fitting, and test temperature is 25 DEG C.
At 25 DEG C, 45# carbon steels concentration of hydrochloric acid be 2mol/L, sunflower disk pectin density of corrosion inhibitor be respectively 0g/L,
Nyquist figures in the pickling solution of 0.1g/L, 0.5g/L, 1g/L, 2g/L.As shown in Fig. 2, wherein curve 1, curve 2, curve
3, curve 4, curve 5 respectively represent a concentration of 0g/L, 0.1g/L, 0.5g/L, 1g/L, 2g/L of sunflower disk pectin corrosion inhibiter.From
Nyquist figure major parts known to Fig. 2 show as the capacitive reactance arc of a semicircular, and what is mainly indicated is charge transfer resistance
Size controls the electric charge transfer of corrosion of carbon steel, and arc length shows that more greatly charge transfer resistance is bigger, and corrosion charge is less susceptible to turn
It moves, i.e., corrosion mitigating effect is better.From when a concentration of 2g/L of sunflower disk pectin corrosion inhibiter, impedance arc is maximum known to this figure, inhibition effect
Rate is maximum, consistent with weightless test result.It can be seen that other than capacitive reactance arc, there is also second time constant, high concentrations
It is especially apparent, caused by this time constant may be the absorption of carbon steel surface Fe dissolving ions.
3. using electrokinetic potential polarozation curve method research low molecular weight sunflower disk pectin to the corrosion mitigating effect of carbon steel
Fig. 3 is：At 25 DEG C, 45#Carbon steel is 2mol/L in concentration of hydrochloric acid, and sunflower disk pectin density of corrosion inhibitor is respectively
Polarization curve in the pickling solution of 0g/L, 0.1g/L, 0.5g/L, 1g/L, 2g/L, wherein curve 1, curve 2, curve 3, song
Line 4, curve 5 respectively represent a concentration of 0g/L, 0.1g/L, 0.5g/L, 1g/L, 2g/L of sunflower disk pectin corrosion inhibiter, corresponding
Corrosion potential Ecorr(mV) and corrosion electric current density Icorr(μ A) as shown in table 2 below, inhibition efficiency η (%) is calculated as follows：
Wherein I0It is to be not added with inhibition and addition various concentration sunflower disk under 2mol/L to be illustrated respectively in concentration of hydrochloric acid with I
The corrosion electric current density of the pickling solution of pectin corrosion inhibiter.
As known from Table 2, as the increase of density of corrosion inhibitor, corrosion electric current density are gradually reduced, inhibition efficiency is with inhibition
Agent concentration increases and increases, and shows after corrosion inhibiter is added, it is suppressed that corrosion of the carbon steel in hydrochloric acid solution, result are real with weightlessness
It tests consistent with polarization curve result.It is found that corrosion potential is mobile to anode from table 2 and attached drawing 3, the current density of polarization curve
It is gradually reduced with the addition of corrosion inhibiter, although anode and cathode shows as declining, cathode as concentration increases
Current density is but bigger than blank solution, and anode shows as smaller than blank solution, and corrosion potential is gradually shuffled, and current density subtracts
It is small, show that low molecule sunflower disk pectin is the corrosion inhibiter based on a kind of Anodic Type inhibits.
2 concentration of hydrochloric acid of table is under 2mol/L, and the corrosion current of the pickling solution of various concentration sunflower disk pectin corrosion inhibiter is close
Degree and inhibition efficiency
4. studying corrosion mitigating effect of the low molecular weight sunflower disk pectin to carbon steel using with ultramicroscopic observation
Fig. 4 is 45 impregnated without pickling solution#Carbon steel test piece；Fig. 5 is not add the salt of any corrosion inhibiter at 25 DEG C
45 after 48h are impregnated in the pickling solution that acid concentration is 2mol/L#Carbon steel test piece；Fig. 6 (100 times of resolution ratio) and Fig. 7 (resolution ratio
500 times) it is the concentration of hydrochloric acid 2mol/L at 25 DEG C, and sunflower disk pectin corrosion inhibiter adds the pickling solution of a concentration of 2g/L
Middle 45 impregnated after 48h#Carbon steel test piece.
It is seen from figure 4 that the specimen surface just polished is very smooth, cut is high-visible；Fig. 5 shows that sample is not adding
Add in the pickling solution of any corrosion inhibiter impregnate after its surface it is too corroded, there is rugged corrosion gully, according to
It is 136.5 μm that software data, which provides it to corrode the height in gully, and width is 137.5 μm；Fig. 6, Fig. 7 show that be immersed in hydrochloric acid dense
Degree is 2mol/L, and sunflower disk pectin corrosion inhibiter adds the specimen surface of the pickling solution of a concentration of 2g/L, compared to blank corruption
Liquid is lost, surface topography is relatively smooth, does not occur corrosion gully, but etch pit one by one, corrosion are high
Degree is 8.44 μm；Data above shows after adding corrosion inhibiter that carbon steel test piece receives significant protection, and addition sunflower disk pectin is slow
Corrosivenesses of the HCl to carbon steel structure can be weakened after erosion agent, corrosion mitigating effect is apparent.
Claims (7)
1. a kind of method preparing carbon steel pickling solution using low molecular weight sunflower disk pectin for corrosion inhibiter, which is characterized in that institute
State method is with water using hydrochloric acid solution as carbon steel pickling solution as carbon steel pickling corrosion inhibitor with low molecular weight sunflower disk pectin
Solvent is prepared using the carbon steel pickling solution that low molecular weight sunflower disk pectin is corrosion inhibiter；
The method is specifically to prepare low molecular weight sunflower disk pectin powder first using sunflower disk as raw material, is molten with water
The low molecular weight sunflower disk pectin powder is dissolved in agent, low molecular weight sunflower disk pectin solution is prepared, then toward described low
It hydrochloric acid solution and water is added in molecular weight sunflower disk pectin solution prepares the application low molecular weight sunflower disk pectin and be
The carbon steel pickling solution of corrosion inhibiter；
The preparation of the low molecular weight sunflower disk pectin powder includes the following steps：
(1) sunflower disk is washed with deionized water only, is dried in 100 DEG C of vacuum drying chamber, ground using pulverizer dry
Sunflower disk after dry crosses 60 mesh sieve, obtains sunflower disk powder；
(2) the sunflower disk powder and water obtained step (1) is according to 1:20~1:25 solid-to-liquid ratio mixing, to mixed
Citric acid solution is added in system, the pH of regulation system to 5~5.5, and into system be added mass fraction be 1.5%~
2% cellulase, 3.5~4h of constant temperature oscillation at a temperature of 55 DEG C~60 DEG C obtain extracting solution, the extracting solution are placed in 90
DEG C hot water in 5min, centrifuged after enzyme deactivation, after supernatant crosses sand core funnel, in 4 DEG C of short-term preservations；
(3) by the pectin extracting soln refrigerated in step (2) and the acidic ethanol of 4 DEG C of refrigeration according to volume ratio 1:2.5 mixing, fully
Stirring, stands under the conditions of 4 DEG C, pectin is made fully to be precipitated, filter to obtain pectin with 200 mesh nylon filtering cloths, then wash 3 with ethyl alcohol
It is secondary, in 60 DEG C of drying, with mortar grinder at powder, obtain the low molecular weight sunflower disk pectin powder；Prepare the low molecule
Amount sunflower disk pectin solution method be：Water, heating stirring, heating temperature are added into the low molecular weight sunflower disk pectin powder
Degree is 40 DEG C, rotating speed 500r/min, until stopping stirring after pectin complete swelling.
2. a kind of side preparing carbon steel pickling solution for corrosion inhibiter using low molecular weight sunflower disk pectin according to claim 1
Method, which is characterized in that it is described using low molecular weight sunflower disk pectin be corrosion inhibiter carbon steel pickling solution in, the low molecule
The mass concentration for measuring sunflower disk pectin is 0.1~2g/L, and the molar concentration of hydrochloric acid is 0.5~2mol/L.
3. a kind of side preparing carbon steel pickling solution for corrosion inhibiter using low molecular weight sunflower disk pectin according to claim 1
Method, which is characterized in that the weight average molecular weight of the low molecular weight sunflower disk pectin is 5~12KDa, number-average molecular weight 650.
4. a kind of side preparing carbon steel pickling solution for corrosion inhibiter using low molecular weight sunflower disk pectin according to claim 1
Method, which is characterized in that the esterification degree of the low molecular weight sunflower disk pectin is 20.01%~32.52%, and galacturonic acid contains
Amount is 70~80%.
5. a kind of side preparing carbon steel pickling solution for corrosion inhibiter using low molecular weight sunflower disk pectin according to claim 1
Method, which is characterized in that at 25 DEG C, pretreated 45# carbon steel test pieces are placed on the application low molecular weight sunflower disk pectin
To impregnate 48h in the carbon steel pickling solution of corrosion inhibiter, the low molecular weight sunflower disk pectin is to 45# carbon steel inhibition efficiencies
86.92%~95.99%.
6. a kind of carbon steel pickling corrosion inhibitor, which is characterized in that the corrosion inhibiter is low molecular weight sunflower disk pectin；
The weight average molecular weight of the low molecular weight sunflower disk pectin is 5~12KDa, number-average molecular weight 650.
7. a kind of carbon steel pickling corrosion inhibitor according to claim 6, which is characterized in that the low molecular weight sunflower disk pectin
Esterification degree is 20.01%~32.52%, and galacturonic acid content is 70%~80%.
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