CN107326366A - A kind of aluminium carbon steel galvanic corrosion corrosion inhibiter and preparation method - Google Patents
A kind of aluminium carbon steel galvanic corrosion corrosion inhibiter and preparation method Download PDFInfo
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- CN107326366A CN107326366A CN201710509755.8A CN201710509755A CN107326366A CN 107326366 A CN107326366 A CN 107326366A CN 201710509755 A CN201710509755 A CN 201710509755A CN 107326366 A CN107326366 A CN 107326366A
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing compounds
- C23F11/141—Amines; Quaternary ammonium compounds
- C23F11/142—Hydroxy amines
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
- C23F11/182—Sulfur, boron or silicon containing compounds
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Abstract
The invention discloses a kind of fine aluminium carbon steel galvanic corrosion corrosion inhibiter and preparation method, belong to galvanic corrosion inhibiter technology field, comprising：The parts by weight of component A 20.0 100.0；The parts by weight of component B 0 60；Desalination water surplus；The component A includes hydrazine hydrate, the one or more of azanol；The component B includes L ascorbic acid, the one or more of sulphite, will be added after component A and component B compoundings in the circulation where fine aluminium carbon steel, fine aluminium carbon steel galvanic corrosion speed that can be effectively in reduction system.
Description
Technical field
The present invention relates to galvanic corrosion inhibiter technology field, more particularly to a kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter and
Preparation method.
Background technology
Belt surface formula condenser and the supercritical generating sets indirect air cooling system for being arranged vertically air cooling heat radiator, its steamer
The steam discharge of machine steam discharge and steam feed pump is condensed into surface condenser by recirculated water, through recirculated water after recirculated water is heated
Cooled down after pump pressurization into gravity-flow ventilation indirect dry cooling tower by air, the recirculated water after cooling is back to surface condenser and formed again
Closed cycle.
Recirculated water initially enters air cooling tower after being boosted through water circulating pump, 1 water inlet dry tube diameter is DN2400.It is cold in tower
But the water after is exchanged heat through 1 DN2400 recirculated waters return pipe to main building condenser, and the water after heating again returns to circulation
Water pump, completes a closed cycle.
Air cooling tower interior circulation Water flow-path is as follows：Enter water inlet endless tube → sector branch pipe in underground in air cooling tower recirculated water main pipe → tower
In → cooling triangle bottom water inlet main pipe → cooling triangle (tube bank) → cooling triangle bottom backwater main pipe → sector branch pipe → tower
Ground lower water-back endless tube → go out cooling-tower circulating water main pipe.
Cooling triangle bottom Inlet and outlet water branch pipe and the carbon steel that telescopic DN200 is equipped with the middle of cooling triangle (tube bank) are swollen
Swollen section.
Cooling triangle bottom Inlet and outlet water branch pipe and expansion joint are all carbon steel materials and with whole circulating water line system are
Conduct.Carbon steel expansion joint cools down triangle (tube bank) by carbon steel half flange and 1050A fine aluminiums and passes through the company of being detachably connected
Connect.Carbon steel and 1050A fine aluminiums are dissimilar metal, in the case of electrical connection, it may occur that galvanic corrosion.And 1050A fine aluminiums are cooled down
Triangle (tube bank) is connected same grounded screen with carbon steel half flange and expansion joint, and 1050A fine aluminiums cooling triangle (tube bank) is with breathing out
Husband's flange is electrically connected by the formation of common ground net.Both electric connections can all cause galvanic corrosion.Actual operating data is proved：
The galvanic corrosion of exactly this carbon steel -1050A fine aluminiums causes circulation to occur in very short time after first time water-filling
The sudden rises of recirculated water pH, and then trigger the corrosion of 1050A fine aluminium radiators large area.
Cathodic protection is the conventional electrochemical anti-corrosive etching method of power plant cycle water system condenser metal structure, by additional
Electric current or connection sacrificial metal, make metal current potential reduce and be protected.Because the 1050A of indirect air cooling circulation is pure
Aluminium radiating triangle area is huge and complicated, and it is unpractical to implement cathodic protection.
Insulating Design between dissimilar metal is often the emphasis of Anti-corrosion design in galvanic corrosion control technology and extremely weighed
Depending in practical application, generally taking insulation to arrange between titanium alloy, the higher corrosion resistant metal of copper alloy equipotential and steel component
Apply.For indirect air cooling circulation, carbon steel serves as negative electrode simultaneously again in recirculated water general corrosion system in galvanic corrosion
In serve as the successful precedent that insulating Design is yet there are no in the complex corrosion structure of anode.
Addition corrosion inhibiter is the method for a kind of simple and effective and practicable control system corrosion.But, it is domestic at present
Do not control the special corrosion agent of galvanic corrosion also outside, simply replaced with other corrosion inhibiter, therefore control galvanic corrosion
Effect is undesirable.Especially for overcritical indirect air cooling circulation, this corrosion inhibiter must also be able to simultaneously effective
Control the local corrosion and homogeneous corrosion of carbon steel, stainless steel and 1050A fine aluminiums.
When galvanic corrosion refers to that dissimilar metal contacts with each other in same medium, because corrosion potential is unequal, there is electricity
Even electric current flowing, increases the relatively low dissolving metal speed of current potential, and the phenomenon that the higher dissolving metal speed of current potential reduces.
Potential difference of the dissimilar metal in corrosive medium is the necessary condition and motive force of galvanic corrosion, when different metals
One group of corrosion cell (corrosion galvanic couple) is constituted when material contacts with each other in corrosive medium, the higher metal of OCP is the moon
Pole, the relatively low metal of OCP is anode, and the corrosion rate of anode metal increases, and the corrosion rate of cathodic metal reduces.
When potential difference of the dissimilar metal in corrosive medium is more than 0.25V, more serious galvanic corrosion can be produced.
The content of the invention
In order to overcome the shortcoming that the effect of existing corrosion inhibiter control galvanic corrosion is undesirable, the invention provides a kind of aluminium-
Carbon steel galvanic corrosion corrosion inhibiter and preparation method, can control overcritical indirect air cooling unit circulation fine aluminium-carbon steel electricity
Thermogalvanic corrision, can control the uniform corrosion rate of carbon steel, stainless steel and fine aluminium in recirculated water again.
The technical scheme that present invention solution above-mentioned technical problem is used is as follows：
A kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter, comprising：
Component A 20.0-100.0 parts by weight；
Component B 0-60 parts by weight；
Desalination water surplus；
The component A includes hydrazine hydrate, the one or two of azanol；
The component B includes L-AA, the one or more of sulphite.
Further, it is also appropriate comprising gas deoxygenation conditioning agent.
Further, the gas deoxygenation conditioning agent is SO2。
Further, the component A is included on the basis of its gross weight：
80% hydrazine hydrate 20-60 parts by weight；
50% hydroxylamine solution AR 0-2.0 parts by weight；
Desalination water surplus.
Further, the component B is included on the basis of its gross weight：
Further, the deoxidation catalyst is cobaltous sulfate or the dissolvable salt of other one or more cobalts.
In order to solve the above technical problems, also to provide a kind of technical scheme as follows by the present invention：
A kind of preparation method of any of the above-described kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter, is comprised the steps of：
Selected component A composition and the parts by weight for measuring each composition；
Selected component B composition and the parts by weight for measuring each composition；
Component A, component B and demineralized water parts by weight are determined, are then mixed and stirred for being formed uniformly mixed liquor.
Further, also comprising step：
After in the recirculated water where the mixed liquor adds aluminium-carbon steel galvanic couple, it is directly added into and removes in right amount into recirculated water
VPO catalysts.
Further, also comprising step：
As the pH of recirculated water>When 8.8, gas deoxygenation conditioning agent is injected into the recirculated water, until monitoring recirculated water pH
Value is returned and drops to 8.2-8.5 scopes.
Further, controlled concentration of the corrosion inhibiter in recirculated water is：
Hydrazine：10μg/L-40μg/L N2H4；
Ascorbic acid：0-50μg/L C6H8O6。
A kind of present invention aluminium-carbon steel galvanic corrosion corrosion inhibiter provided above and preparation method, pass through component A and component B
The reduction agent composition of compounding carries out reproducibility processing, regulation carbon steel, stainless steel and pure to the recirculated water where aluminium-carbon steel galvanic couple
The electrochemical state of aluminium corrosion system, is corroded by the concentration and increase that reduce the depolarizing agent oxygen for participating in corroding cathode process
The cathodic polarization ability of electrode reaches the purpose of the corrosion rate of the relatively low anode metal fine aluminium of reduction current potential.
Brief description of the drawings
Fig. 1 simulates schematic diagram for the operation principle of corrosion inhibiter of the present invention；
Fig. 2 is 1050A fine aluminiums corrosion potential and hydrazine concentration relationship curve in pure water；
Fig. 3 is 1050A fine aluminiums corrosion potential and hydrazine concentration relationship curve in simulation loop water；
Fig. 4 is carbon steel corrosion potential and relation curve of hydrazine concentration under the conditions of pure water；
Fig. 5 is pH value to SO2、HSO3 -And SO3 2-The influence figure of three kinds of fractions distributions；
Embodiment
In order that technical problems, technical solutions and advantages to be solved are clearer, clear, tie below
Drawings and examples are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
The present invention provides a kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter, comprising：20.0-100.0 the component A, 0-60 of parts by weight
The component B and desalination water surplus of parts by weight；The component A is one or more comprising hydrazine hydrate, azanol；The component B bags
One or more containing L-AA, sulphite.Wherein component A is included by component A parts by weight：20-60 parts by weight
80% hydrazine hydrate；50% hydroxylamine solution (AR), the desalination water surplus of 0-2.0 parts by weight.Component B presses component B parts by weight bag
Contain：L-AA (GR), the ammonium bisulfite of 0-5.0 parts by weight of 0-25 parts by weight；The deoxygenation catalysis of 0-0.5 parts by weight
Agent；And desalination water surplus.Proper amount of gas deoxygenation conditioning agent, such as SO are added when needing2.Gas deoxygenation conditioning agent is only used for
PH burst rise accident conditionses occur for recirculated water, add SO2Control standard be control pH in Circulating Water be in 8.2-8.5 model
Enclose.
It is preferred that, choose component A using 80% hydrazine hydrate as host, 50% azanol be assistant agent, using component A gross weight as
Benchmark, the content of the hydrazine hydrate is preferably 20-60 weight %, more preferably 31.25 weight %.The content of azanol is excellent
Elect 0.05-2.0 weight %, more preferably 0.10 weight % as.
For example configure component A 1000g, (hydrazine content：160g/kgN2H4), each composition is as follows：
80% hydrazine hydrate 312.5g
(31.25%)；
50% hydroxylamine solution AR 1.0g (0.1%)；
Demineralized water 686.5g (68.65%).
※ is noted：Hydrazine cubage：
The hydrazine is in alkalescent with water reaction, and reaction equation is as follows：
N2H4+H2O→N2H5 ++OH-Form positive monovalence hydrazine ion N2H5 +, (10)
First ionization constant is 1.0 × 10-6(298K)；
N2H4+2H2O→N2H6 2++20H-' form positive divalence hydrazine ion N2H6 2+, (11)
Secondary ionization constant is 9.0 × 10-16(298K)。
It is preferred that, component B is comprising host L-AA, assistant agent ammonium bisulfite, deoxidation catalyst and the aqueous solution.
On the basis of component B gross weight, the content of the L-AA is preferably 1-10 weight %, more preferably 8.0 weight %.
The content of ammonium bisulfite is preferably 0-5.0 weight %, more preferably 1.0 weight %.Deoxidation catalyst is a kind of cobalt salt, preferably
Use cobaltous sulfate, the content of the cobaltous sulfate is preferably 0-0.5 weight %, more preferably 0.1 weight %.Demineralized water is molten
Agent, the content of demineralized water is preferably 60-98 weight %, more preferably 91 weight %.
Such as configuration component B 1000g：(L-AA content：80g/kg C6H8O6), each component is as follows：
L-AA GR (99.7%) 80.0g (8%)；
Ammonium bisulfite 10.0g (1%)；
Demineralized water 910.0g (91%).
Shown under the molecular structure of L-AA：
It has been investigated that, the low metal of electrode potential can only accelerate its own to corrode with the high metal contact of electrode potential,
Rather than cause the basic reason of corrosion, it is impossible to galvanic corrosion is defined as to " metal is contacted due to the high metal of same electrode potential
Caused by corrode ".The basic reason for occurring galvanic corrosion (contact corrosion) process is still due to having negative electrode to go to pole in solution
The presence of agent.Can potential difference only determine the direction that occur galvanic corrosion and corrosion current, and the degree of galvanic corrosion depends on
In polarizability of each metal in corrosive medium.
By taking 1050A fine aluminiums-carbon steel galvanic corrosion problem as an example, the oxygen in recirculated water is that 1050A fine aluminiums-carbon steel galvanic couple is rotten
Unique cathodic depolarization agent of erosion, the activation energy for strengthening cathodic polarization or increase redox reactions is 1050A fine aluminiums-carbon steel electricity
The technology path of thermogalvanic corrision corrosion inhibiter reagent.If preventing oxygen molecule from participating in connecing the removal circulation completely of nucleophobic reduction reaction
Oxygen in water, metal will not corrode.
Corrosion inhibiter is made according to above-mentioned formula of the invention, it is rotten that the above-mentioned corrosion inhibiter of the present invention is added into 1050A fine aluminiums/pure water
Erosion system, controlled concentration of the corrosion inhibiter in recirculated water be：
Component A (hydrazine)：10μg/L-40μg/LN2H4, 16 μ g/LN preferably2H4
Component B (L-AA)：0-80μg/L C6H8O6,
It is preferred that：The μ g/L C of pH ＞ 8.5,406H8O6；
PH≤8.5,0 μ g/L C6H8O6。
Other auxiliary elements are with " component A " is formulated and " component B formulas " ratio adds recirculated water, it is not necessary to separately metering control
System.
The corrosion inhibiter is added after 1050A fine aluminiums/pure water corrosion system, and the oxidation that spontaneous offer can be lost into electronics is anti-
Should：(1), (2), (3), (15) and (16), i.e., couple new anode current (i in corrosion systemaN2H4、iaC6H806、iaNH2OHWith) (Fig. 1), these introduce corrosion systems new anode current with it is original in 1050A fine aluminiums/pure water corrosion system
Anodic attack electric current is the corrosion current (i of aluminium0 aAl) coupling form new corrosion electrochemistry system.Cathodic depolarization agent oxygen molecule
It is the unique cathode current (i coupled in 1050A fine aluminiums/pure water corrosion system to obtain electronicsc02)。
The oxidation reaction of aqueous hydrazine：
N2H4+40H--4e-=N2+4H2O -1.15V SHE (1)
N2H5 +-50H--4e-=N2+5H2O -0.23V SHE (2)
The oxidation reaction of ascorbic acid：
The oxidation reaction of sulphite：SO4 2-+H2O+2e-═SO3 2-+2OH- (15)
The oxidation reaction of azanol：N2+4H2O+2e-=2NH2OH+2OH- (16)
According to corrosion electrochemistry on polarization and the theory of mixed potential, under mixed potential stable state, electrode surface
Total faraday's admittance of reaction is faraday's admittance sum of each electrode reaction, i.e. all anodes of corroding electrode surface coupling
Kinetic current sum is equal to the cathode reaction electric current sum of all couplings.So, if expanded in the limit reacted with negative electrode oxygen uptake
New anode reaction electric current is introduced in the anode reaction for dissipating current balance type, it is possible to original unique sun in reduction or inhibition system
Anode reaction (corrosion) electric current (i.e. corrosion rate) of pole kinetic current-aluminium.
According to mixed potential theory：
The mixed potential equation of before processing：
Mixed potential equation after processing：
Obviously：Hydrazine, ascorbic acid, azanol and sulphite (SO are added to 1050A fine aluminiums/pure water corrosion system3 2-) etc.
After reducing agent processing, the corrosion rate of 1050A fine aluminiums diminishes.
icO2The limiting diffusion current i of=oxygend：
In formula：N redox reaction receiving and losing electrons numbers, cathode reaction is in, under the conditions of alkaline pure water：O2+2H2O+4e-
=4OH-, n=4；F:96500 coulombs/mol of Faraday constant；D：Diffusion coefficient of the oxygen in water；C:The concentration of dissolved oxygen；δ：
Thickness of diffusion layer.
Fig. 1 describes the operation principle of corrosion inhibiter：
Handle the corroding electrode reaction before (addition corrosion inhibiter) (on the left of Fig. 1):
Anode reaction：Al+4OH—-3e-=H2AlO3+H2O (8)
Cathode reaction：O2+2H20+4e-=4OH- (9)
Handle the corroding electrode reaction after (addition corrosion inhibiter) (on the right side of Fig. 1):
Anode reaction：
Al+4OH—-3e-=H2AlO3+H2O (8)
N2H4+4OH—-4e-=N2+4H2O (1)
N2H5 +-5OH--4e-=N2+5H2O (2)
SO4 2-+H2O+2e-═SO3 2-+2OH- (15)
N2+4H2O+2e-=2NH2OH+2OH- (16)
Cathode reaction：O2+2H20+4e-=4OH- (9)
Fig. 2 is 1050A fine aluminiums corrosion potential and hydrazine concentration relationship curve in pure water；Proved from the result of study in figure：
After hydrazine is added, the corrosion potential of fine aluminium is substantially to negative movement in system.
Fig. 3 is 1050A fine aluminiums corrosion potential and hydrazine concentration under the conditions of the simulation loop aqueous medium containing aluminium and chlorion
Relation curve, research as we know from the figure has shown that：After hydrazine is added, the corrosion potentials of 1050A fine aluminiums substantially to negative movement, this
Plant the negative phenomenon explanation moved of corrosion potential：Negative electrode oxygen uptake of the hydrazine mainly by suppressing aluminium electrode reacts to realize it to 1050A
The corrosion inhibition of fine aluminium, be a kind of cathode type corrosion inhibiter.
Fig. 4 is carbon steel corrosion potential and relation curve of hydrazine concentration under the conditions of pure water；From Fig. 4 data it may be said that
Bright, after hydrazine is added, the corrosion potential of carbon steel system is substantially to positive movement, and result of study is proved：Hydrazine is by suppressing carbon
The anode reaction of steel electrode realizes its corrosion inhibition to carbon steel, is a kind of typical anodic corrosion inhibitor.
Further it also found by electrochemical impedance research：The corrosion of 1050A fine aluminiums is typical oxygen diffusion process control
Process, according to formula (7), concentration of the reduction cathodic depolarization agent oxygen in recirculated water, it is possible to reduce the corruption of 1050A fine aluminiums
Lose speed.Compounded so adding a kind of normal temperature oxygen scavenger in this corrosion inhibitor formula, the inhibition effect of corrosion inhibiter can be improved
Rate.
The data of actual measurement are proved：The corrosion inhibiter that the present invention is provided is a kind of existing good control 1050A fine aluminiums-carbon
Steel galvanic corrosion function, can reduce the preferable corrosion inhibiter of the uniform corrosion rate of carbon steel, stainless steel and 1050A fine aluminiums again.
Therefore, added to 1050A fine aluminiums/pure water corrosion system after the corrosion inhibiter of the present invention, these corrosion inhibiter are in alkaline bar
Oxidation reaction (1), (2), (3), (15) and (16) under part, changes the mixed potential and corrosion current of corrosion system, reduces
Corrosion rate, realizes the technical purpose of the present invention.
In order to strengthen the effect for controlling galvanic corrosion of corrosion inhibiter, the corrosion inhibitor formula employs a kind of gas deoxygenation and adjusted
Save agent SO2.Gas deoxygenation conditioning agent SO2Decanting point should be located at the inlet tube of hydrazine dosing pump.
In demineralized water：SO2、HSO3 -、SO3 2-Three kinds of forms keep following chemical balance relation
Gas deoxygenation conditioning agent SO2The reproducibility of Circulating Water Corrosion system can be strengthened, while the reaction product H of generation+Can
To reduce the pH of recirculated water, the passivating film that protection 1050A fine aluminiums are formed in water.The feature of " the gas deoxygenation conditioning agent "
It is：It is only used for recirculated water and occurs pH burst rise accident conditionses, adds SO2Control standard be control ph be in 8.2-
8.5 scope.
During chemical deoxidization, no matter SO is added2Or HSO3 -It is required for changing into SO3 2-Form could and O2Point
Son completes the course of reaction of deoxygenation：
2SO3 2-+O2=2SO42- (14)
The electrochemical reaction equation of oxygen removal process；
Anode reaction：SO4 2-+H2O+2e═SO3 2-+2OH- (15)
Cathode reaction：O2+2H20+4e-=4OH- (9)
It is known, SO3 2-It is also a kind of strong reductant, electrode is participated in together with hydrazine and ascorbic acid according to equation (15)
Reaction, introduces new anode current in corrosion system, further the corrosion rate of reduction 1050A fine aluminiums.
Fig. 5 is pH value to SO2、HSO3 -And SO3 2-The influence figure of three kinds of fractions distributions.It can be seen that, the pH value of recirculated water is influence
The key factor of sulfite oxidation speed.As seen from Figure 5, SO2、HSO3 -And SO3 2-Three kinds of reactants according to recirculated water pH
Value reaches balanced sequence, SO3 2-I.e. the maximum condition deoxygenation reaction speed highest condition of concentration share.PH8.5 is sulfurous
The optimal pH value of hydrochlorate deaerating effect.
According to above corrosion inhibitor formula and preparation method, specific examples below is proposed.
Embodiment one
The present embodiment prepares a kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter, for the overcritical indirect air cooling circulating waters of 350MW
(the water capacity 7000m of system3)。
The formulation composition used for：
100.0% component A；
0% component B.
It is preferred that component A formula be：
80% hydrazine hydrate 312.5g
(31.25%)；
50% hydroxylamine solution AR 1.0g (0.1%)；
Demineralized water 686.5g (68.65%).
※ is noted：Hydrazine cubage：
The adding consistency is controlled to be：Hydrazine concentration：16μg/L N2H4；That is 16mg/m3N2H4；
L-AA concentration：0μg/L C6H8O6。
Gained hydrazine chemical feeding quantity is calculated to should be：16 × 7000=112g N2H4,
Component A formula hydrazine content is：160g/kg N2H4；
The amount that component A need to be put into is：
Component B quantity need to be put into：0.
Start from unit comercial operation on December 19th, 2015 on April 27th, 2017 and shut down, chemical supervision inspection result：
1050A fine aluminiums, 304 Corrosion of Stainless Steel indicate that test piece and 1050A fine aluminiums-carbon steel galvanic couple indicate that mistake is not corroded in test piece to corrosion
Weight, corrosion of carbon steel indicates that the corrosion rate average value of test piece is 0.015mm/a, better than GB50050-2007 industrial circulating cooling waters
Handle the standard of design specification：0.075mm/a.In 1000 times of above-mentioned corrosion coupons of metallography microscope Microscopic observation, do not observe
Spot corrosion and the situation of other corrosion.
Embodiment two：
A kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter is prepared in this implementation, for the overcritical indirect air cooling circulating waters of 350MW
Unite water capacity 7000m3(ton), using formula as below structure：
55.6% component A；
44.4% component B.
It is preferred that component A formula be：
80% hydrazine hydrate 312.5g
(31.25%)；
50% hydroxylamine solution AR 1.0g (0.1%)；
Demineralized water 686.5g (68.65%).
※ is noted：Hydrazine cubage：
It is preferred that component B formula be：
L-AA GR (99.7%) 80.0g (8%)；
Ammonium bisulfite 10.0g (1%)；
Demineralized water 910.0g (91%).
Runtime chemical feeding quantity prepares (pH ＞ 8.5)
Adding medicine control concentration：Hydrazine concentration：40μg/L N2H4；L-AA concentration：16μg/L C6H8O6。
Calculate hydrazine chemical feeding quantity：40 × 7000=280g N2H4,
Component A formula hydrazine content：160g/kg N2H4；
Component A amounts, which need to be put into, is：
L-AA chemical feeding quantity：16 × 7000=112g
Component B formula ascorbic acid content：80g/kg C6H8O6
The amount that component B need to be put into is：
250mL the present embodiment water samples are taken, electrokinetic potential scanning polarization curve survey is carried out using CS310 types electrochemical workstation
Amount, scanning potential range is from -0.2V (relative open circuit) to+0.2V (relative open circuit), and sweep speed is 1mV/s, and sampling rate is
2Hz。
The method that corrosion potential and corrosion rate are accurately calculated according to Tafel curve is corrosion speed international at present
Rate determines most accurate method.Anode and cathode Tafel slopes and corrosion rate, polarization are calculated using non-linear three-parameter method
The corrosion parameters such as resistance.
Measurement result：Corrosion rate of the 1050A fine aluminiums in above-mentioned medium：0.00011mm/a；State less than 0.05mm/a
Interior advanced level.
Embodiment three：
A kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter is prepared in this implementation, for the overcritical indirect air cooling circulating waters of 350MW
Unite water capacity 7000m3(ton), using formula as below structure：
100.0% component A；
0% component B.
It is preferred that component A formula be：
80% hydrazine hydrate 312.5g
(31.25%)；
50% hydroxylamine solution AR 1.0g (0.1%)；
Demineralized water 686.5g (68.65%).
Component A formula hydrazine content：160g/kg N2H4；
Runtime is set to：Material：1050A fine aluminiums；Corrosive medium：Demineralized water (pH7.2), hydrazine concentration：40μg/L
N2H4；Ascorbic acid concentrations：0μg/L C6H8O6。
250mL the present embodiment water samples are taken, electrokinetic potential scanning polarization curve survey is carried out using CS310 types electrochemical workstation
Amount, scanning potential range is from -0.2V (relative open circuit) to+0.2V (relative open circuit), and sweep speed is 1mV/s, and sampling rate is
2Hz。
The method that corrosion potential and corrosion rate are accurately calculated according to Tafel curve is corrosion speed international at present
Rate determines most accurate method.Curve calculated using non-linear three-parameter method anode and cathode Tafel slopes and corrosion rate,
The corrosion parameters such as polarization resistance.
Measurement result：Corrosion rate of the 1050A fine aluminiums in above-mentioned medium：6.4×10-5mm/a；Less than 0.05mm/a's
Advanced international level.
Galvanic corrosion electric current is determined using electrochemistry noise, measurement result is：
1050A fine aluminiums-carbon steel galvanic corrosion current density in above-mentioned medium：0.1μA/cm2；Better than air standard
A as defined in the HB5374 grades of μ A/cm of standard 0.32。
Example IV：
A kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter is prepared in this implementation, for the overcritical indirect air cooling circulating waters of 350MW
Unite water capacity 7000m3(ton), using formula as below structure：
The corrosion inhibitor formula structure used for：
100.0% component A；
0% component B.
It is preferred that component A formula be：
80% hydrazine hydrate 312.5g
(31.25%)；
50% hydroxylamine solution AR 1.0g (0.1%)；
Demineralized water 686.5g (68.65%).
Component A formula hydrazine content：160g/kg N2H4；
Hydrazine concentration：40μg/L N2H4；Ascorbic acid concentrations：0μg/L C6H8O6。
Runtime is set to：Material：1050A fine aluminiums；Corrosive medium：Simulation loop water (156 μ g/L of artificial addition
Cl-) pH8.7, the μ g/L of pure water+40 Al3++156μg/L Cl-；
250mL the present embodiment water samples are taken, electrokinetic potential scanning polarization curve survey is carried out using CS310 types electrochemical workstation
Amount, scanning potential range is from -0.2V (relative open circuit) to+0.2V (relative open circuit), and sweep speed is 1mV/s, and sampling rate is
2Hz。
The method that corrosion potential and corrosion rate are accurately calculated according to Tafel curve is corrosion speed international at present
Rate determines most accurate method.Curve calculated using non-linear three-parameter method anode and cathode Tafel slopes and corrosion rate,
The corrosion parameters such as polarization resistance.
Corrosion rate of the 1050A fine aluminiums in above-mentioned medium：10×10-5mm/a；The country less than 0.05mm/a first intakes
It is flat.
Corrosion of carbon steel speed：0.018mm/a, better than the mark of GB50050-2007 Code for design of industrial recirculating cooling water treatment
It is accurate：0.075mm/a.
Galvanic corrosion electric current is determined using electrochemistry noise, measurement result is：
1050A fine aluminiums-carbon steel galvanic corrosion current density：0.53μA/cm2；Meet as defined in air standard HB5374 B grades
Standard：0.3μA/cm2＜ igThe μ A/cm of ＜ 1.02。
Embodiment five：
A kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter is prepared in this implementation, for the overcritical indirect air cooling circulating waters of 350MW
Unite water capacity 7000m3(ton), using formula as below structure：
100.0% component A；
0% component B.
It is preferred that component A formula be：
80% hydrazine hydrate 312.5g
(31.25%)；
50% hydroxylamine solution AR 1.0g (0.1%)；
Demineralized water 686.5g (68.65%).
Component A formula hydrazine content：160g/kg N2H4；
Runtime is set to：Material：1050A fine aluminiums；Corrosive medium：Pure water, pH 7.1, hydrazine：16μg/L(N2H4),
Ascorbic acid：0
250mL the present embodiment water samples are taken, electrokinetic potential scanning polarization curve survey is carried out using CS310 types electrochemical workstation
Amount, scanning potential range is from -0.2V (relative open circuit) to+0.2V (relative open circuit), and sweep speed is 1mV/s, and sampling rate is
2Hz。
The method that corrosion potential and corrosion rate are accurately calculated according to Tafel curve is corrosion speed international at present
Rate determines most accurate method.Curve calculated using non-linear three-parameter method anode and cathode Tafel slopes and corrosion rate,
The corrosion parameters such as polarization resistance.
Measurement result is：
Corrosion rate：0.000023mm/a.Advanced international level less than 0.05mm/a.
Embodiment six：
A kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter is prepared in this implementation, for the overcritical indirect air cooling circulating waters of 350MW
Unite water capacity 7000m3(ton), using formula as below structure：
100.0% component A；
0% component B.
It is preferred that component A formula be：
80% hydrazine hydrate 312.5g
(31.25%)；
50% hydroxylamine solution AR 1.0g (0.1%)；
Demineralized water 686.5g (68.65%).
Component A formula hydrazine content：160g/kg N2H4
System environments is set to：Material：1050A fine aluminiums；Corrosive medium：Pure water, pH 7.1, hydrazine：40μg/L(N2H4),
Ascorbic acid：0.
250mL the present embodiment water samples are taken, electrokinetic potential scanning polarization curve survey is carried out using CS310 types electrochemical workstation
Amount, scanning potential range is from -0.2V (relative open circuit) to+0.2V (relative open circuit), and sweep speed is 1mV/s, and sampling rate is
2Hz。
The method that corrosion potential and corrosion rate are accurately calculated according to Tafel curve is corrosion speed international at present
Rate determines most accurate method.Curve calculated using non-linear three-parameter method anode and cathode Tafel slopes and corrosion rate,
The corrosion parameters such as polarization resistance.
Measurement result is：
Corrosion rate：0.00014mm/a.Advanced international level less than 0.05mm/a.
Embodiment seven：
A kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter is prepared in this implementation, for the overcritical indirect air cooling circulating waters of 350MW
Unite water capacity 7000m3(ton), using formula as below structure：
Use the formulation composition of corrosion inhibiter for：
55.6% component A；
44.4% component B.
It is preferred that component A formula be：
80% hydrazine hydrate 312.5g
(31.25%)；
50% hydroxylamine solution AR 1.0g (0.1%)；
Demineralized water 686.5g (68.65%).
※ is noted：Hydrazine cubage：
It is preferred that component B formula be：
L-AA GR (99.7%) 80.0g (8%)；
Ammonium bisulfite 10.0g (1%)；
Demineralized water 910.0g (91%).
7000m3Recirculated water chemical feeding quantity：
Adding medicine control concentration：Hydrazine concentration：40μg/L N2H4；L-AA concentration：16μg/L C6H8O6。
Calculate hydrazine chemical feeding quantity：40 × 7000=280g N2H4,
Component A formula hydrazine content：160g/kg N2H4；
Component A amounts, which need to be put into, is：
L-AA chemical feeding quantity：16 × 7000=112g
Component B formula ascorbic acid content：80g/kg C6H8O6
The amount that component B need to be put into is：
System environments is set to：Material：1050A fine aluminiums
Corrosive medium：Pure water, pH8.7 (aluminium：40μg/LAl3+, chlorion：156μg/LCl-,
Hydrazine：40μg/L N2H4, ascorbic acid：16μg/L C6H8O6)
250mL the present embodiment water samples are taken, electrokinetic potential scanning polarization curve survey is carried out using CS310 types electrochemical workstation
Amount, scanning potential range is from -0.2V (relative open circuit) to+0.2V (relative open circuit), and sweep speed is 1mV/s, and sampling rate is
2Hz。
The method that corrosion potential and corrosion rate are accurately calculated according to Tafel curve is corrosion speed international at present
Rate determines most accurate method.Curve calculated using non-linear three-parameter method anode and cathode Tafel slopes and corrosion rate,
The corrosion parameters such as polarization resistance.
Measurement result is：
Corrosion rate：0.00010mm/a.Advanced international level less than 0.05mm/a.
Embodiment eight：
A kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter is prepared in this implementation, for the overcritical indirect air cooling circulating waters of 350MW
Unite water capacity 7000m3(ton), using formula as below structure：100.0% component A；
0% component B.
It is preferred that component A formula be：
80% hydrazine hydrate 312.5g
(31.25%)；
50% hydroxylamine solution AR 1.0g (0.1%)；
Demineralized water 686.5g (68.65%).
Component A formula hydrazine content：160g/kg N2H4；
System environments is set to：
Material：1050A fine aluminiums；Corrosive medium：Pure water, pH8.7 (aluminium：40μg/L Al3+, chlorion：156μg/L Cl-,
Hydrazine：16μg/L N2H4, ascorbic acid：0
250mL the present embodiment water samples are taken, electrokinetic potential scanning polarization curve survey is carried out using CS310 types electrochemical workstation
Amount, scanning potential range is from -0.2V (relative open circuit) to+0.2V (relative open circuit), and sweep speed is 1mV/s, and sampling rate is
2Hz。
The method that corrosion potential and corrosion rate are accurately calculated according to Tafel curve is corrosion speed international at present
Rate determines most accurate method.Curve calculated using non-linear three-parameter method anode and cathode Tafel slopes and corrosion rate,
The corrosion parameters such as polarization resistance.
Measurement result is：
Corrosion rate：0.00029mm/a.Advanced international level less than 0.05mm/a.
Embodiment nine：
A kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter is prepared in this implementation, for the overcritical indirect air cooling circulating waters of 350MW
Unite water capacity 7000m3(ton), using formula as below structure：
55.6% component A；
44.4% component B.
It is preferred that component A formula be：
80% hydrazine hydrate 312.5g
(31.25%)；
50% hydroxylamine solution AR 1.0g (0.1%)；
Demineralized water 686.5g (68.65%).
※ is noted：Hydrazine cubage：
It is preferred that component B formula be：
L-AA GR (99.7%) 80.0g (8%)；
Ammonium bisulfite 10.0g (1%)；
Demineralized water 910.0g (91%).
7000m3Recirculated water chemical feeding quantity：
Adding medicine control concentration：Hydrazine concentration：40μg/L N2H4；L-AA concentration：16μg/L C6H8O6。
Calculate hydrazine chemical feeding quantity：40 × 7000=280g N2H4,
Component A formula hydrazine content：160g/kg N2H4；
Component A amounts, which need to be put into, is：
L-AA chemical feeding quantity：16 × 7000=112g
Component B formula ascorbic acid content：80g/kg C6H8O6
The amount that component B need to be put into is：
System environments is set to：Material：304 stainless steels；Corrosive medium：Pure water, pH8.7 (aluminium：40μg/L Al3+, chlorine from
Son：156μg/L Cl-, hydrazine：16μg/L N2H4, ascorbic acid：16μg/L C6H8O6)
250mL the present embodiment water samples are taken, electrokinetic potential scanning polarization curve survey is carried out using CS310 types electrochemical workstation
Amount, scanning potential range is from -0.2V (relative open circuit) to+0.2V (relative open circuit), and sweep speed is 1mV/s, and sampling rate is
2Hz。
The method that corrosion potential and corrosion rate are accurately calculated according to Tafel curve is corrosion speed international at present
Rate determines most accurate method.Curve calculated using non-linear three-parameter method anode and cathode Tafel slopes and corrosion rate,
The corrosion parameters such as polarization resistance.
Measurement result is：
Corrosion rate：0.00054mm/a, better than GB50050-2007《Code for design of industrial recirculating cooling water treatment》Regulation
Corrosion of Stainless Steel speed be less than 0.005mm/a standard requirement.
Embodiment ten：
A kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter is prepared in this implementation, for the overcritical indirect air cooling circulating waters of 350MW
Unite water capacity 7000m3(ton), using formula as below structure：
55.6% component A；
44.4% component B.
It is preferred that component A formula be：
80% hydrazine hydrate 312.5g
(31.25%)；
50% hydroxylamine solution AR 1.0g (0.1%)；
Demineralized water 686.5g (68.65%).
※ is noted：Hydrazine cubage：
It is preferred that component B formula be：
L-AA GR (99.7%) 80.0g (8%)；
Ammonium bisulfite 10.0g (1%)；
Demineralized water 910.0g (91%).
7000m3Recirculated water chemical feeding quantity：
Adding medicine control concentration：Hydrazine concentration：40μg/L N2H4；L-AA concentration：16μg/L C6H8O6。
Calculate hydrazine chemical feeding quantity：40 × 7000=280g N2H4,
Component A formula hydrazine content：160g/kg N2H4；
Component A amounts, which need to be put into, is：
L-AA chemical feeding quantity：16 × 7000=112g
Component B formula ascorbic acid content：80g/kg C6H8O6
The amount that component B need to be put into is：
System environments is set to：
Material：Carbon steel；Corrosive medium：Pure water, pH8.7 (aluminium：40μg/L Al3+, chlorion：156μg/L Cl-, hydrazine：
40μg/L N2H4, ascorbic acid：16μg/L C6H8O6)
250mL the present embodiment water samples are taken, electrokinetic potential scanning polarization curve survey is carried out using CS310 types electrochemical workstation
Amount, scanning potential range is from -0.2V (relative open circuit) to+0.2V (relative open circuit), and sweep speed is 1mV/s, and sampling rate is
2Hz。
The method that corrosion potential and corrosion rate are accurately calculated according to Tafel curve is corrosion speed international at present
Rate determines most accurate method.Curve calculated using non-linear three-parameter method anode and cathode Tafel slopes and corrosion rate,
The corrosion parameters such as polarization resistance.
Measurement result is：
Corrosion rate：0.035mm/a, better than GB50050-2007《Code for design of industrial recirculating cooling water treatment》It is defined
Corrosion of carbon steel speed is less than 0.075mm/a standard requirement.
Result of the test shows：1050A fine aluminiums-carbon steel galvanic corrosion and 1050A fine aluminiums and carbon steel are in experiment corrosive medium
In corrosion rate all reached the control range of correlation standard.
Above by reference to the preferred embodiments of the present invention have been illustrated, not thereby limit to the interest field of the present invention.This
Art personnel do not depart from the scope of the present invention and essence, can have a variety of flexible programs to realize the present invention, for example as one
The feature of individual embodiment can be used for another embodiment and obtain another embodiment.All institutes within the technical concept with the present invention
Any modifications, equivalent substitutions and improvements made, all should be within the interest field of the present invention.
Claims (10)
1. a kind of aluminium-carbon steel galvanic corrosion corrosion inhibiter, it is characterised in that include：
Component A 20.0-100.0 parts by weight；
Component B 0-60 parts by weight；
Desalination water surplus；
The component A includes hydrazine hydrate, the one or more of azanol；
The component B includes L-AA, the one or more of sulphite.
2. aluminium according to claim 1-carbon steel galvanic corrosion corrosion inhibiter, it is characterised in that also include：
Gas deoxygenation conditioning agent is appropriate.
3. aluminium according to claim 2-carbon steel galvanic corrosion corrosion inhibiter, it is characterised in that：The gas deoxygenation conditioning agent
For SO2。
4. aluminium according to claim 1-carbon steel galvanic corrosion corrosion inhibiter, it is characterised in that：The component A using its gross weight as
Benchmark is included：
80% hydrazine hydrate 20-60 parts by weight；
50% hydroxylamine solution AR 0-2.0 parts by weight；
Desalination water surplus.
5. aluminium according to claim 1-carbon steel galvanic corrosion corrosion inhibiter, it is characterised in that：The component B using its gross weight as
Benchmark is included：
6. aluminium according to claim 5-carbon steel galvanic corrosion corrosion inhibiter, it is characterised in that：The deoxidation catalyst is sulphur
The dissolvable salt of sour cobalt or other one or more cobalts.
7. a kind of preparation method of any one aluminium of the claim 1-6-carbon steel galvanic corrosion corrosion inhibiter, it is characterised in that bag
Containing following steps：
Selected component A composition and the parts by weight for measuring each composition；
Selected component B composition and the parts by weight for measuring each composition；
Component A, component B and demineralized water parts by weight are determined, are then mixed and stirred for being formed uniformly mixed liquor.
8. the preparation method of aluminium according to claim 7-carbon steel galvanic corrosion corrosion inhibiter, it is characterised in that also comprising step
Suddenly：
After in the recirculated water where the mixed liquor adds aluminium-carbon steel galvanic couple, appropriate deoxidation catalyst is added into recirculated water.
9. the preparation method of aluminium according to claim 7-carbon steel galvanic corrosion corrosion inhibiter, it is characterised in that also comprising step
Suddenly：
As the pH of recirculated water>When 8.8, gas deoxygenation conditioning agent is injected into the recirculated water, until monitoring pH in Circulating Water is returned
Drop to 8.2-8.5 scopes.
10. the preparation method of aluminium according to claim 7-carbon steel galvanic corrosion corrosion inhibiter, it is characterised in that：The inhibition
Controlled concentration of the agent in recirculated water be：
Component A：10μg/L-40μg/L N2H4；
Component B：0-50μg/L C6H8O6。
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| CN112376050A (en) * | 2020-11-15 | 2021-02-19 | 西安热工研究院有限公司 | Carbon steel and aluminum corrosion inhibitor |
| CN115433941A (en) * | 2022-08-08 | 2022-12-06 | 华北电力科学研究院有限责任公司 | Corrosion inhibitor and method for controlling corrosion of SCAL type intercooling system and indoor simulation system and method |
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| CN112376050A (en) * | 2020-11-15 | 2021-02-19 | 西安热工研究院有限公司 | Carbon steel and aluminum corrosion inhibitor |
| CN115433941A (en) * | 2022-08-08 | 2022-12-06 | 华北电力科学研究院有限责任公司 | Corrosion inhibitor and method for controlling corrosion of SCAL type intercooling system and indoor simulation system and method |
| CN115433941B (en) * | 2022-08-08 | 2024-02-27 | 华北电力科学研究院有限责任公司 | Corrosion inhibitor and method for controlling SCAL type indirect cooling system corrosion and indoor simulation system and method |
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