CN109328245A - The inorganic agent of the pickling and formation passivating film that are carried out to remove peeling and the iron rust in stainless steel pipes and structures welding position - Google Patents
The inorganic agent of the pickling and formation passivating film that are carried out to remove peeling and the iron rust in stainless steel pipes and structures welding position Download PDFInfo
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- CN109328245A CN109328245A CN201780003397.1A CN201780003397A CN109328245A CN 109328245 A CN109328245 A CN 109328245A CN 201780003397 A CN201780003397 A CN 201780003397A CN 109328245 A CN109328245 A CN 109328245A
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Abstract
The present invention relates to for carrying out pickling processes to welding position and rusty part and forming the composition of passivating film, the welding position and rusty part due to being formed whens installing pipeline, construction, the equipment etc. that are made of stainless steel.It neutralizes alkaline aqueous solution to pH value and reaches 6.9-7.1, neutral preparations are made, with going the air of removing carbon dioxide to carry out Air Exposure to neutral preparations to increase the content of dissolved oxygen, make oxidation-reduction potential 170-310 mV.This preparation is the neutral preparations for being passivated stainless steel metal surface.
Description
Technical field
The present invention relates to be less susceptible to get rusty in the oxygen atmosphere of atmosphere, under the environmental conditions such as humidity, aqueous solution, corrode
Stainless steel pipes (compared with general steel (steel)), more particularly, to installation stainless steel pipes, construction and at being arranged
Welding position and rusty part when standby carry out the composition of formation passivating film after pickling.
Background technique
Most commonly used stainless steel is STS304 and STS316L on shipyard and ocean complete set of equipments at present, they because
Flaw is generated for outer exposed, and the superficial layer being oxidized when welding is contaminated or deforms and occurs corroding and corrode.
Normal stainless steel is with Fe for basic ingredient, mainly by Cr and Ni and a small amount of Mo, Ti, Mn, Zr, Nb and N etc.
It constitutes.
Currently, stainless steel is shipped by modes such as cold rolling, welding, heat treatment, pickling processes and passivation film process as steel
Plate, coil, steel pipe and other products.
In addition, the surface of oxidation is mainly by FeO, Fe3O4、Fe2O3、NiiO、Ni3O4、Ni2O3、CrO3And Cr2O3Etc. shapes
At.
Like this, when there are more Cr on the surface in oxidation2O3And Ni2O3In the case where, due to acid resistance, corrosion-resistant
Property, oxidative resistance is very strong and is not easy to get rusty.
In addition, the case where iron oxide is also in this way, in acid resistance, corrosion resistance, oxidative resistance: Fe2O3>Fe3O4>
FeO。
In addition, existing most pickling and passivation treating agent sour gas or acid solution carry out operation, wherein containing
There is harmful chemical, some acid and alkaline chemicals used when preparing the raw material of neutral solution are also listed in harmful
Substance is learned, therefore, when using these substances manufacture product, don't fail to mark it for harmful chemicals object in material information column
Matter.
Now, chemical substance administrative law and Industrial Security health care law regulation, when using harmful chemical, it is necessary to wear
Chemical safety protective equipment carries out that protective equipment must also be equipped with when operation.
Especially in shipbuilding and complete set of equipment industry, when carrying out pickling and passivation working process, region is carried out
Control, cannot carry out other operations simultaneously.
In addition, when building ship and ocean complete set of equipments, stainless steel pipes and construction setting are existing in ship or construction
After, have to carry out at pickling and passivating film processing when the pipeline and construction of setting are contaminated or generate corrosion because of welding
Reason.
In general, the acid solution preparation for using nitric acid, sulfuric acid, hydrochloric acid and hydrofluoric acid to mix is as the place of pickling and passivation
Manage agent.At this point, cleaning solution can flow down when acid solution can flow to floor surface or washing and cleaning operation, it can generally make coating
Epoxy resin reacts and causes to change colour or deform, and at this moment usually to paint again.
In addition, be neutralized using basic formulations after using highly acid preparation at once.Finally, having to use clear water
Carry out ending washing process.Because having used harmful chemical, it is necessary to which strict control scene cannot carry out other works simultaneously
Industry will also be equipped with chemical substance safety protection equipment and protective equipment.
Summary of the invention
The project of solution
As the inorganic agent for pickling and passivation, due to being neutral preparations that pH value is 6.9 ~ 7.1, on fabrication, nothing
It must be neutralized with basic formulations, washing process can be carried out, at once to shorten process time.
In addition, do not react due to being neutral preparations with resin, therefore coating part will not occur to change colour or deform,
Therefore more convenient to use.
In addition, not containing harmful chemical in the raw material mark information of product specification, therefore not by chemicals
The constraint of matter administrative law, danger bursting tube logos and Industrial Security hygiene, to be more convenient to operate.
The solution of project
For this purpose, the present invention be the peeling and iron rust in order to remove stainless steel pipes and structures welding position and the pickling that carries out and
Passivating film working process.In the disodium hydrogen phosphate that 2-10 parts by weight are added, the gluconic acid of 1-5 parts by weight is received, 0.5-3 parts by weight
Sodium tripolyphosphate alkaline aqueous solution in, so that the alkaline aqueous solution and the sodium dihydrogen phosphate of 1.1-4.5 parts by weight is reacted,
Neutralization reaction, which occurs, makes pH value reach 6.9-7.1.
Air Exposure is carried out with the air for having got rid of carbon dioxide, increases dissolved oxygen, oxidation-reduction potential, which is made, is
The neutral preparations of 170-310 Mv.
The effect of invention
Therefore, it is an advantage of the invention that carrying out acid removing peeling and the iron rust of stainless steel pipes and structures welding position
It washes and when passivating film working process, because having used the composition of neutral preparations, not only can solve using harmful chemical
Problem, but also can with other job parallelism operations, and because its be neutral preparations, even if flowing to the ground of epoxy coating
On plate, it will not occur to change colour and deform.
Moreover, to be washed after smearing acid solution in existing process, then, alkaline solution is smeared,
It washes again, it is very inconvenient.If using neutral preparations, smear it is i.e. washable after neutral solution, make to process it is simpler, greatly
Process time is shortened greatly.
Detailed description of the invention
Fig. 1 is the passivation working process figure and working process figure of the invention of existing stainless steel surface.
Fig. 2 is the constituent analysis curve graph that the stainless steel surface of corrosion phenomenon occurs.
Fig. 3 is the constituent analysis curve graph according to treated the stainless steel surface of embodiment 1.
Fig. 4 is the salt spraytest that 8502 specification of JIS H of treated stainless steel surface is carried out according to embodiment 1
As a result.
Fig. 5 is the constituent analysis curve graph of the stainless steel surface handled according to comparative example 1.
Fig. 6 is the salt spraytest knot of 8502 specification of JIS H of the stainless steel surface handled according to comparative example 1
Fruit.
Fig. 7 is the constituent analysis curve graph of the stainless steel surface handled according to comparative example 2.
Fig. 8 is the salt spraytest result of 8502 specification of JIS H of the stainless steel surface handled according to comparative example 2.
Fig. 9 is the constituent analysis curve graph of the stainless steel surface handled according to embodiment 2.
Figure 10 is the salt spraytest result of 8502 specification of JIS H of the stainless steel surface handled according to embodiment 2.
Figure 11 is the constituent analysis curve of the stainless steel surface handled according to embodiment 3.
Figure 12 is the salt spraytest result of 8502 specification of JIS H of the stainless steel surface handled according to embodiment 3.
Figure 13 is the constituent analysis curve graph of the stainless steel surface handled according to embodiment 4.
Figure 14 is the salt spraytest result of 8502 specification of JIS H of the stainless steel surface handled according to embodiment 4.
Specific embodiment
Optimal morphology to realize the present invention instills the disodium hydrogen phosphate of 2-10 parts by weight, the Portugal of 1-5 parts by weight in water
Grape saccharic acid is received, and alkaline aqueous solution is made in the sodium tripolyphosphate of 0.5-3 parts by weight.
The sodium dihydrogen phosphate that 1.1-4.5 parts by weight are added in above-mentioned alkaline aqueous solution reacts, and reaches pH value
6.9-7.1.After neutralization reaction occurs, Air Exposure is carried out with the air for getting rid of carbon dioxide, increases dissolved oxygen, redox
Current potential is 170 mV-310 mV, so far form to remove peeling and the iron rust of stainless steel pipes and structures welding position and
It carries out pickling and forms the inorganic agent of passivating film.
The form to carry out an invention
It is characteristic of the invention that using neutral preparations, processing program is relatively easy, and does not make compared with existing acidic formulation
It is more environmentally friendly with harmful chemical.
In particular, if after neutral preparations to be coated in the position being corroded, after the corrosion such as phosphate and gluconate
Iron oxide and iron hydroxide of formation etc. react, to remove iron rust.Evanohm, nickel, iron and dissolved oxygen react,
Surface forms oxide skin(coating), to form passivating film.
Embodiment 1
It receives in the gluconic acid of the disodium hydrogen phosphate containing 10 parts by weight, 3 parts by weight, the sodium tripolyphosphate of 1 parts by weight and 81.9
In the alkaline aqueous solution of the water of parts by weight, the alkaline aqueous solution and the sodium dihydrogen phosphate of 4.1 parts by weight is made to react, is made
Property preparation.
As described above, the pH value of manufactured neutral preparations is 7.1, ORP measuring instrument (Oxidation Reduction is used
Potential meter, oxidation-reduction potentiometer) result of oxidation-reduction potential is measured as -210 mV.By above-mentioned neutral preparations
It is applied to the position for being coated with epoxy resin, it is confirming after a week the results show that not changing colour and deforming.
This property is confirmed in table 1.
In order to understand the pickling of neutral preparations as described above and form the degree of passivating film, in marine piping (STS304
Austenitic stainless steel) in extract the sub-fraction of part corroded by welding as test sample, and carry out SAM
(Scanning Auger Microscope, scanning Auger microscope) analysis, the result obtained are as shown in Figure 2.
As shown in Fig. 2, containing C(60% on the surface), Fe(10%), Ca(4%) and oxygen (26%), on the surface, discovery
There are Cr and Ni on the inside of 28nm.
That is, this pipeline forms the corrosion layer of 28nm.
After smearing as above made neutral preparations on above-mentioned pipeline, observes on the surface, find the foreign matter (hydrogen-oxygen of pipeline
Compound, oxide and oil etc.) react, after washing process, pipe surface present clean state, measurement reaction start to
The time of end needs about 140 minutes.
The part of washed pipeline is extracted as test sample.Carry out SAM(scanning electron microscope) analysis, knot
Fruit is as shown in Figure 3.
Just as shown in Figure 3 above, the content that the content that the content of the C on surface is 53%, Cr is 6%, Ni is containing for 3%, Fe
The content that amount is 7%, Ca is 6.5%, and the content of oxygen is 24.5%.
That is, the content of C is lower, it can more find out that the etching degree occurred by pickling is better.It can for 53% from the content of C
To find out, the etching of generation is seldom, oxide layer with a thickness of 80nm.
In addition, since the total content of metal is 22.5%, compared with the content of oxygen is 24.5%, ratio about 1:1, so
The passivating film being made of FeO, CrO and NiO is formd on surface.
Table 1
In order to understand the corrosion resistance of the passivating film on above-mentioned test sample (stainless steel), the salt water of 8502 specification of JISH is carried out
Spray testing, as a result as shown in Figure 4.Generation iron rust can be confirmed after 80 hours, therefore passivating film is undesirable level.
Comparative example 1
The gluconic acid of the phosphoric acid of 20 parts by weight, 5 parts by weight is received and is mixed and made into acidic formulation with the water of 70 parts by weight, to the acid
After property preparation carries out confirmation property, as the result is shown pH value be 1.2, oxidation-reduction potential 120mV.This acidic formulation is coated in ring
The position of oxygen resinous coat changes colour after 1 hour, deforms after a week.
Therefore, when carrying out pickling to pipeline using acidic formulation at the construction field (site) and form passivating film operation, in order to prevent
Preparation flow to ground, it is necessary to adopt various measures, which results in inconvenience and substantially reduce working efficiency.
This property is as shown in table 1.
After acidic formulation is made according to comparative example 1, the acidic formulation is smeared on the pipeline corroded, after 50 minutes,
It is washed with water, is then applied to again using the basic formulations that the water of the sodium hydroxide of 2 parts by weight and 98 parts by weight mixes
It on pipeline, is rinsed with water after 30 minutes, extracts a part and carry out SAM analysis, as a result as shown in Figure 5.
From figure 5 it can be seen that the content that the content that the content of the C on surface is 45%, Cr is 5.5%, Ni is 3%, Fe's
Content is 10%, and the content that the content of oxygen (O) is 29.5%, Ca is 7%.
The content of C is 45%, and compared with test sample (60%), etching is more；The total content of metal is 25.5%, with containing for oxygen
Amount is compared for 29.5%, and oxygen and metal ratio are 1.14.Therefore contain a small amount of Cr in the oxide on surface2O3、Ni2O3With
Fe2O3, form the passivating film that main component is FeO, CrO and NiO.
The thickness of passivating film where oxide layer is about 8-18nm.
In order to understand stainless steel passivating film corrosion resistance, carry out 8502 specification of JIS H salt spraytest, knot
Fruit can be confirmed that a small amount of iron rust of generation, passivating film are common horizontal as shown in fig. 6, after 200 hours.
Comparative example 2
The water of the tartaric acid of 5 parts by weight, the thiolactic acid of 5 parts by weight, the citric acid of 10 parts by weight and 60 parts by weight is mixed into system
For at acidic formulation, the potassium hydroxide that 20 parts by weight are added into the acidic formulation brings it about reaction, neutral preparations is made.
According to above-mentioned example, confirm made of neutral preparations property, result be pH value be 7.3, oxidation-reduction potential be-
190mV.The neutral preparations are coated in coating position, confirmation is not as a result, coating position deforms after a week.
The characteristic of this substance embodies in table 1, the disadvantage is that having used harmful chemical potassium hydroxide in raw material.
According to neutral preparations made of this comparative example, this neutral preparations is smeared on the pipeline being corroded, after 110 minutes,
It is rinsed with water.The part of extraction conduit carries out SAM analysis, as a result as shown in Figure 7.
From it has been confirmed that the content of C is 60% on surface, Cr is not present in Fig. 7, and the content of Ni is less than 1%, the content of Fe
Content for 8%, Ca is 7%, and the content of oxygen (O) is 24%.
That is, the content of the C on surface is 60%, it can be seen that the etching occurred after pickling is seldom, and there is no influence passivating film
Corrosion resistance Cr, there are a small amount of Ni, it is easy to generate iron rust.
In order to which the corrosion resistance for understanding the passivating film in test sample is strong and weak, the salt water spray of 8502 specification of JIS H has been carried out
Mist test, as a result as shown in figure 8, can confirm generation iron rust after 50 hours, passivating film is bad.
Embodiment 2
Neutral preparations are fabricated in the same manner as in Example 1, and spend the air of removing carbon dioxide, with 100ml/min's
Flow velocity carries out 30 minutes Air Exposures to the neutral preparations of 100 parts by weight, and oxidation-reduction potential is made and rises in 6 mV
Property preparation.
Containing the carbon dioxide of 0.03-0.05% in air, compared with oxygen, carbon dioxide is more soluble in neutral preparations
In.Process for the dissolution of anti-block is hindered, and is first removed the carbon dioxide in air, is then aerated again to neutral preparations
Processing.
The method for removing removing carbon dioxide is removed by the flow reactor full of liquid white lime.
To before carrying out Air Exposure according to neutral preparations made of the present embodiment, automatic suction-type titanium dioxide should be used
Carbon measuring instrument carries out Air Exposure after determining not carbonated again.
By as above made neutral preparations, it is coated in the position of coating epoxy, what is confirmed after a week has no as the result is shown
Discoloration and deformation.
This property embodies in table 1.
In the pipeline corroded, after being smeared with the neutral preparations according to made of the present embodiment, the foreign matter on surface occurs
Hair is answered, and after washing, clean state is presented in pipe surface.Detect that reaction starts to reaction to terminate to have consumed about 100
The time of minute, than the time that embodiment 1 shortens about 40 minutes.
The part of washed pipeline is extracted as test sample, carries out SAM analysis, as a result as shown in Figure 9.
As it can be seen in figure 9 that it be 3%, Fe content is 10%, Ca's that C content, which is the content that 50%, Cr content is 5.5%, Ni,
The content that content is 5%, O is 26.5%.
That is, from the C content on surface for 50% it has been confirmed that because a little etching has occurred in pickling.The total content of metal is
23.5%, compared with the content of oxygen is 26.5%, the ratio of oxygen and metal is 1.13.On the surface, about 20% or more oxidation
Object is with M2O3Form exist, i.e. Cr2O3、Ni2O3And Fe2O3, and form most of passivation being made of FeO, CrO and NiO
Film.
In order to understand the power of the corrosion resistance of passivating film in sample, JIS H8502 salt spraytest is carried out, has been tested
The results are shown in Figure 10, after about 150 minutes, produces a small amount of iron rust, can conclude that passivating film is common horizontal.
Embodiment 3
After neutral preparations are made in the same manner as shown in Example 1, with remove the air of removing carbon dioxide, with 100ml/min
Flow velocity 100 parts by weight neutral preparations are carried out with the Air Exposures of about 2 hours, oxidation-reduction potential is made and rises to 90mV's
Neutral preparations.
The neutral preparations according to made of the present embodiment are applied to the position for being coated with epoxy resin, the result confirmed after a week
It has been shown that, which has no discoloration and deformation.
This property can see in table 1.
The neutral preparations according to made of embodiment are smeared in the pipeline corroded, the foreign matter on surface reacts,
About 90 minutes are consumed after being washed, until clean state is presented to pipe surface altogether, is shortened 50 minutes than embodiment 1.
The part of washed pipeline is extracted as test sample, carries out SAM analysis, as a result as shown in figure 11.
It will be seen from figure 11 that the content that the content that the content of the C on surface is 34%, Cr is 7.5%, Ni is 3.5%, Fe
Content be 12%, Ca content be 7%, O content be 36%.
That is, being 34% as can be seen that because pickling produces many etchings from the content of the C on surface, the total content of metal is
30%, it is Cr there are about the oxide on 40% surface that compared with the content of oxygen is 36%, the ratio of oxygen and metal, which is 1.2,2O3、Ni2O3
And Fe2O3, a part of passivating film for foring FeO, CrO and NiO.
In order to understand the power of the corrosion resistance of passivating film in test sample, the brine spray of 8502 specification of JIS H is carried out
Test, as a result as shown in figure 12.Iron rust is generated after 300 hours, the passivating film of formation is common horizontal.
Embodiment 4
After neutral preparations are made with method same as Example 1, with got rid of the air of carbon dioxide, with 100ml/min
Flow velocity the neutral preparations of 100 parts by weight are carried out with the Air Exposures of about 4 hours, oxidation-reduction potential is made and rises to 170
The neutral preparations of mV.
It will be applied to the position for being coated with epoxy resin according to neutral preparations made of the present embodiment, confirms the position after a week
Have no discoloration and deformation.
This property can see from table 1.
The neutral preparations according to made of embodiment are smeared on the pipeline corroded, the foreign matter on surface occurs hair and answers,
After washing, the time consumed until clean state is presented is about 70 minutes, is shortened 70 minutes than embodiment 1.
The part of washed pipeline is extracted as test sample, the SAM of progress is analyzed, result Figure 13.
It can be observed from fig. 13 that the content that the content that the content of the C on surface is 27%, Cr is 8%, Ni is 4%, Fe's
The content that the content that content is 13.5%, Ca is 3.5%, O is 44%.
That is, the content of C is 27% as can be seen that because a large amount of etching has occurred in pickling from surface, the total content of metal is
29%, compared with the content of oxygen is 44%, the ratio of oxygen and metal is 1.5, on the surface, form most of oxide by
Cr2O3、Ni2O3And Fe2O3The passivating film of composition.
In order to understand the corrosion resistance of the passivating film in test sample, the brine spray examination of 8502 specification of JIS H has been carried out
It tests, test result is as shown in figure 14, after 300 hours, does not generate iron rust, passivating film is good.
Embodiment 5
After being fabricated in the same manner as in Example 1 neutral preparations, with remove the air of removing carbon dioxide, with 100ml/min
Flow velocity the neutral preparations of 100 parts by weight are carried out with the Air Exposures of 10 hours, oxidation-reduction potential is made and rises to 278
The neutral preparations of mV.
It will be applied to the position for being coated with epoxy resin according to neutral preparations made of the present embodiment, confirms the position after a week
Without discoloration and deformation.
This property embodies in table 1.
Smeared on the pipeline corroded the foreign matter according to neutral preparations made of the present embodiment, on surface occur it is anti-
It answers, clean state is presented to pipe surface after washing and needs about 70 minutes.
The part of the pipeline after rinsing is extracted as test sample, SAM analysis is carried out, analyzes the shape of result and embodiment 4
State is similar with ingredient.In order to which the corrosion resistance for understanding passivating film is strong and weak, the salt spraytest of 8502 specification of JIS H has been carried out,
Test result and embodiment 4 are consistent, after 300 hours, do not generate iron rust, passivating film is good.
Embodiment 6
By the disodium hydrogen phosphate of 1 parts by weight, the sodium gluconate of 3 parts by weight, the sodium tripolyphosphate of 1 parts by weight and 94.3 parts by weight
Water be mixed and made into alkaline aqueous solution, so that the alkaline aqueous solution and the sodium dihydrogen phosphate of 0.7 parts by weight is reacted, pH value be made
For 6.9 neutral preparations.
With remove the air of removing carbon dioxide, with the flow velocity of 100ml/min to according to 100 parts by weight made of the present embodiment
Neutral preparations carry out 10 hours Air Exposure, the neutral preparations that oxidation-reduction potential rises to 293mv are made.
This property can see in table 1.
It is smeared on the pipeline corroded according to neutral preparations made of the present embodiment, on the surface, confirmation foreign matter hair
The degree that hair tonic is answered, foreign matter is not removed after 10 hours as the result is shown, this phenomenon be because phosphate component is very few and
It fails to react.
Embodiment 7
By the disodium hydrogen phosphate of 2 parts by weight, the sodium gluconate of 3 parts by weight, the sodium tripolyphosphate of 1 parts by weight and 92.9 parts by weight
Water be mixed and made into alkaline aqueous solution, the sodium dihydrogen phosphate that 1.1 parts by weight are added brings it about reaction, and pH value is made as 7.0
Neutral preparations.
With remove the air of removing carbon dioxide, with the flow velocity of 100ml/min to 100 parts by weight according to made of the present embodiment
Neutral preparations carry out the Air Exposures of about 10 hours, the neutral preparations that oxidation-reduction potential rises to 283mV are made.
This property can see in table 1.
It will be applied on the position for being coated with epoxy resin according to neutral preparations made of the present embodiment, confirm result after a week
It has been shown that, which does not change colour and deforms.
The neutral preparations according to made of the present embodiment are smeared on the pipeline of corrosion, the foreign matter on surface occurs hair and answers, and passes through
Pipe surface is presented clean state and needs to consume about 90 minutes after washing.
The part of the pipeline after rinsing is extracted as test sample, SAM analysis is carried out, as a result occurs and 4 phase of embodiment
As form and ingredient.In order to understand passivating film corrosion resistance power, carried out the brine spray of 8502 specification of JIS H
Test, it is as a result also similar to Example 4, after 300 hours, iron rust is not generated, passivating film is good.
Embodiment 8
By the disodium hydrogen phosphate of 5 parts by weight, the sodium gluconate of 3 parts by weight, the sodium tripolyphosphate of 1 parts by weight and 88.8 parts by weight
Water be mixed and made into alkaline aqueous solution, the sodium dihydrogen phosphate that 2.2 parts by weight are added brings it about reaction, and pH value is made as 7.0
Neutral preparations.
With remove the air of removing carbon dioxide, with the flow velocity of 100ml/min to according to 100 parts by weight made of the present embodiment
Neutral preparations carry out 10 hours Air Exposure, the neutral preparations that oxidation-reduction potential rises to 280 mV are made.
This property is as can be seen from Table 1.
It will be applied on the position for being coated with epoxy resin according to neutral preparations made of the present embodiment, confirm result after a week
It has been shown that, which does not change colour and deforms.
The neutral preparations according to made of the present embodiment are smeared on the pipeline of corrosion, the foreign matter on surface occurs hair and answers, and passes through
Pipe surface is presented clean state and needs to consume about 70 minutes after washing.
The part of the pipeline after rinsing is extracted as test sample, SAM analysis is carried out, as a result occurs and 4 phase of embodiment
As form and ingredient.In order to understand passivating film corrosion resistance power, carried out the brine spray of 8502 specification of JIS H
Test, it is as a result also consistent with embodiment 4, after 300 hours, iron rust is not generated, passivating film is good.
Embodiment 9
It is water-soluble that the water of the disodium hydrogen phosphate of 10 parts by weight, the sodium tripolyphosphate of 1 parts by weight and 85 parts by weight is mixed and made into alkalinity
Liquid, the sodium dihydrogen phosphate for being put into 4 parts by weight bring it about reaction, and the neutral preparations that pH value is 7.1 are made.
With remove the air of removing carbon dioxide, with the flow velocity of 100ml/min to according to 100 parts by weight made of the present embodiment
Neutral preparations carry out the Air Exposures of about 10 hours, the neutral preparations that oxidation-reduction potential rises to 275 mV are made.
This property is as can be seen from Table 1.
It is smeared on the pipeline corroded according to neutral preparations made of the present embodiment, on the surface, confirmation foreign matter hair
The degree that hair tonic is answered, as the result is shown after 10 hours, the foreign matter of oil component is not removed.
This phenomenon is to fail to react since gluconic acid salt component is very few.
Embodiment 10
By the disodium hydrogen phosphate of 10 parts by weight, the sodium gluconate of 1 parts by weight, the sodium tripolyphosphate of 1 parts by weight and 83.8 weight
The water of part is mixed and made into alkaline aqueous solution, and the sodium dihydrogen phosphate that 4.1 parts by weight are added brings it about reaction, and it is 6.9 that pH value, which is made,
Neutral preparations.
With remove the air of removing carbon dioxide, with the flow velocity of 100ml/min to according to 100 parts by weight made of the present embodiment
Neutral preparations carry out 10 hours Air Exposure, the neutral preparations that oxidation-reduction potential rises to 270 mV are made.
This property can see from table 1.
It will be applied on the position for being coated with epoxy resin according to neutral preparations made of the present embodiment, confirm result after a week
It has been shown that, which does not change colour and deforms.
The neutral preparations according to made of the present embodiment are smeared on the pipeline of corrosion, the foreign matter on surface occurs hair and answers, and passes through
Pipe surface is presented clean state and needs to consume about 70 minutes after washing.
It is compared with embodiment 9, because of the gluconate containing 1 parts by weight, oil component is disposed of.
The part of the pipeline after rinsing is extracted as test sample, SAM analysis is carried out, as a result occurs and 4 phase of embodiment
As form and ingredient.In order to understand passivating film corrosion resistance power, carried out the brine spray of 8502 specification of JIS H
Test, it is as a result also consistent with embodiment 4, after 300 hours, iron rust is not generated, passivating film is good.
Embodiment 11
By the disodium hydrogen phosphate of 10 parts by weight, the sodium gluconate of 5 parts by weight, the sodium tripolyphosphate of 1 parts by weight and 79.8 weight
The water of part is mixed and made into alkaline aqueous solution, and the sodium dihydrogen phosphate that 4.2 parts by weight are added brings it about reaction, and it is 7.1 that pH value, which is made,
Neutral preparations.
With remove the air of removing carbon dioxide, with the flow velocity of 100ml/min to according to 100 parts by weight made of the present embodiment
Neutral preparations carry out the Air Exposures of about 10 hours, the neutral preparations that oxidation-reduction potential rises to 263mV are made.
This property has embodiment in table 1.
It will be applied on the position for being coated with epoxy resin according to neutral preparations made of the present embodiment, confirm result after a week
It has been shown that, which does not change colour and deforms.
The neutral preparations according to made of the present embodiment are smeared on the pipeline of corrosion, the foreign matter on surface occurs hair and answers, and passes through
Pipe surface is presented clean state and needs to consume about 70 minutes after washing.
The part of the pipeline after rinsing is extracted as test sample, SAM analysis is carried out, as a result occurs and 4 phase of embodiment
As form and ingredient.In order to understand passivating film corrosion resistance power, carried out the brine spray of 8502 specification of JIS H
Test, it is as a result also consistent with embodiment 4, after 300 hours, iron rust is not generated, passivating film is good.
Embodiment 12
The water of the disodium hydrogen phosphate of 10 parts by weight, the sodium gluconate of 3 parts by weight and 83.1 parts by weight is mixed and made into alkaline water
Solution, the sodium dihydrogen phosphate that 3.9 parts by weight are added bring it about reaction, and the neutral preparations that pH value is 6.9 are made.
With remove the air of removing carbon dioxide, with the flow velocity of 100ml/min to according to 100 parts by weight made of the present embodiment
Neutral preparations carry out 10 hours Air Exposure, the neutral preparations that oxidation-reduction potential rises to -45 mV are made.
This property can see in table 1.
The neutral preparations according to made of the present embodiment are smeared on the pipeline of corrosion, confirm the reaction interval of the foreign matter on surface
Degree, confirmation the results show that by 10 hours, do not remove foreign matter.
This phenomenon is in default of sodium tripolyphosphate ingredient, which can increase the content of dissolved oxygen
And permeability and reactivity are improved, so cannot cause to react.
Embodiment 13
By the disodium hydrogen phosphate of 10 parts by weight, the sodium gluconate of 3 parts by weight, the sodium tripolyphosphate of 0.5 parts by weight and 82.5 weights
The water of amount part is mixed and made into alkaline aqueous solution, so that the alkaline aqueous solution and the sodium dihydrogen phosphate of 4 parts by weight is reacted, pH is made
The neutral preparations that value is 7.0.
With remove the air of removing carbon dioxide, with the flow velocity of 100ml/min to according to 100 weight made of the present embodiment
The neutral preparations of part carry out the Air Exposure of 10 hours, and the neutral preparations that oxidation-reduction potential rises to 220mV are made.
This property has embodiment in table 1.
It will be applied on the position for being coated with epoxy resin according to neutral preparations made of the present embodiment, confirm result after a week
It has been shown that, which does not change colour and deforms.
The neutral preparations according to made of the present embodiment are smeared on the pipeline of corrosion, the foreign matter on surface occurs hair and answers, and passes through
Pipe surface is presented clean state and needs to consume about 80 minutes after washing.
This phenomenon is because compared with embodiment 12, and the present embodiment is improved there are the sodium tripolyphosphate of 0.5 parts by weight
The permeability and reactivity of neutral preparations, and and dissolved oxygen content, improve oxidation-reduction potential.
The part of the pipeline after rinsing is extracted as test sample, SAM analysis is carried out, as a result occurs and 4 phase of embodiment
As form and ingredient.In order to understand passivating film corrosion resistance power, carried out the brine spray of 8502 specification of JIS H
Test, it is as a result also similar to Example 4, after 300 hours, iron rust is not generated, passivating film is good.
Embodiment 14
By the disodium hydrogen phosphate of 10 parts by weight, the sodium gluconate of 3 parts by weight, the sodium tripolyphosphate of 3 parts by weight and 79.5 weight
The water of part is mixed and made into alkaline aqueous solution, so that the alkaline aqueous solution and the sodium dihydrogen phosphate of 4.5 parts by weight is reacted, pH is made
The neutral preparations that value is 7.0.
With remove the air of removing carbon dioxide, with the flow velocity of 100ml/min to according to 100 weight made of the present embodiment
The neutral preparations of part carry out the Air Exposure of about 10 hours, and the neutral preparations that oxidation-reduction potential rises to 310mV are made.
This property is as can be seen from Table 1.
It will be applied on the position for being coated with epoxy resin according to neutral preparations made of the present embodiment, confirm result after a week
It has been shown that, which does not change colour and deforms.
The neutral preparations according to made of the present embodiment are smeared on the pipeline of corrosion, the foreign matter on surface occurs hair and answers, and passes through
Pipe surface is presented clean state and needs to consume about 60 minutes after washing.
The part of the pipeline after rinsing is extracted as test sample, SAM analysis is carried out, as a result occurs and 4 phase of embodiment
As form and ingredient.In order to understand passivating film corrosion resistance power, carried out the brine spray of 8502 specification of JIS H
Test, it is as a result also consistent with embodiment 4, after 300 hours, iron rust is not generated, passivating film is good.
Claims (2)
1. the three of the disodium hydrogen phosphate of 2-10 parts by weight, the sodium gluconate of 1-5 parts by weight and 0.5-3 parts by weight are added in water
Alkaline aqueous solution is made in polyphosphate sodium；
The sodium dihydrogen phosphate that 1.1-4.5 parts by weight are added in above-mentioned alkaline aqueous solution reacts, and pH value is after neutralization reaction
6.9-7.1, using going the air of removing carbon dioxide to carry out Air Exposure, to increase the content of dissolved oxygen, oxidation-reduction potential
170 mV-310 mV are adjusted to, the peeling and iron rust for removing stainless steel pipes and structures welding position is made and carries out acid
Wash and formed the inorganic agent of passivating film.
2. inorganic agent according to claim 1, which is the air for removing removing carbon dioxide with 100 ml/min
To what is obtained after the Air Exposure of the neutral preparations 2-10 hour of progress of 100 parts by weight, dedicated for removing stainless steel pipes
And structures welding position peeling and iron rust and carry out pickling and formed passivating film inorganic agent.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/KR2017/005708 WO2017209524A1 (en) | 2016-06-01 | 2017-05-31 | Treatment agent for pickling to remove scales and rust at welding regions of stainless steel pipes and structures and for forming passivation film |
| KRPCT/KR2017/005708 | 2017-05-31 | ||
| PCT/KR2017/012787 WO2018221797A1 (en) | 2016-06-01 | 2017-11-13 | Pickling and passivation layer treating agent for removing scales and rust from welding zones of stainless steel pipe and structure |
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| CN109328245A true CN109328245A (en) | 2019-02-12 |
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| KR101718478B1 (en) * | 2016-06-01 | 2017-03-21 | (주)천우테크 | A Netural compound passivated for the surface of stainless steel |
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| JPS5565368A (en) * | 1978-11-07 | 1980-05-16 | Toshiba Corp | Strengthening method for making passive state of stainless steel |
| US4521332A (en) * | 1981-03-23 | 1985-06-04 | Pennwalt Corporation | Highly alkaline cleaning dispersion |
| FR2587369B1 (en) * | 1985-09-19 | 1993-01-29 | Ugine Gueugnon Sa | PROCESS OF ACID STRIPPING OF STAINLESS STEEL PRODUCTS |
| US4931102A (en) * | 1988-09-01 | 1990-06-05 | Eaton Corporation | Metal cleaning process |
| JP2004143530A (en) * | 2002-10-24 | 2004-05-20 | Ekusebun:Kk | Metal surface cleaning agent |
| JP5604244B2 (en) * | 2010-09-24 | 2014-10-08 | 株式会社ブリヂストン | Manufacturing method of rubber-metal composite, rubber-metal composite, tire, rubber bearing for seismic isolation, industrial belt, and crawler |
| CN103103549A (en) * | 2012-11-13 | 2013-05-15 | 三达奥克化学股份有限公司 | Pressure spray rinsing agent of cast iron-carbon steel-stainless steel-copper-aluminum combined component special for naval vessel as well as preparation method thereof |
| CN108315748B (en) * | 2018-02-09 | 2020-01-07 | 东莞华拓研磨材料有限公司 | Metal cleaning agent and preparation method thereof |
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