CN110158069A - A kind of quick-acting environment-friendly type blackening agent for surface of steel room temperature and its application - Google Patents
A kind of quick-acting environment-friendly type blackening agent for surface of steel room temperature and its application Download PDFInfo
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- CN110158069A CN110158069A CN201910400987.9A CN201910400987A CN110158069A CN 110158069 A CN110158069 A CN 110158069A CN 201910400987 A CN201910400987 A CN 201910400987A CN 110158069 A CN110158069 A CN 110158069A
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/40—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
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Abstract
The present invention relates to field of metal surface treatment technology, disclose a kind of quick-acting environment-friendly type blackening agent for surface of steel room temperature and its application, black agent includes: copper sulphate 1-3%, nickel sulfate 0.5-4%, polyhydroxy aldehyde 0.5-3%, phytic acid 3-8%, citric acid 0.5-3%, inorganic acid 2-5%, alkyl phenol polyoxyethylene ether 0.5-2%, ammonium molybdate 1-3%, water surplus.Melanism method includes S1, oil removing；S2, cleaning；S3, nigrescence；S4, washing neutralize；S5, immersion oil closing.Blackening agent for surface of the invention is free of selenium, can carry out fast blackening processing to steel surface at normal temperature in application, and gained melanism film is smooth after processing, uniform, rub resistance.
Description
Technical field
The present invention relates to field of metal surface treatment technology more particularly to a kind of quick-acting environment-friendly type blackening agent for surface of steel room temperature and
It is applied.
Background technique
Traditional steel surface nigrescence is 30~90min of processing under 135~150 DEG C of high temperature, and the production cycle is long, energy consumption
Greatly, working condition is poor, and environmental pollution is serious.And the room temperature blackening of steel surface is in the feelings for not changing workpiece dimensional accuracy
Black oxide film is formed under condition.This layer of oxidation film can reduce the friction of sliding surface or supporting surface, have decoration and reduce light reflection and make
With can improve machine components antiseptic property by preservative treatment, be a kind of universal surface treatment of the industrial applications such as machinery, weapons
Technology.
It is clear that room temperature blackening technique is to operate under normal temperature conditions, both without high temperature, alkaline steam and influence environment,
Again it is energy saving, nigrescence speed is fast, meet country environmental protection policy.Room temperature blackening is divided into salt nigrescence system and non-salt nigrescence body again
System.Black the formed a film substance containing selenium is the atraments such as ferrous selenide, copper selenide, iron, at be grouped as generally copper sulphate and
Sub- main salt, complexing agent, stabilizer, buffer, the processing time is shorter, the processing time to black much smaller than alkaline high temperature.But contain selenium
Not only selenides is expensive for blackening agent for surface, and toxicity is big, and long-time service will cause serious environmental pollution.In pay attention to day by day environment
Today of protection, the research and development of nontoxic, low energy consumption non-selenium blackening agent for surface just become very urgent.
A kind of room temperature blackening liquid for steel is disclosed application No. is 2017100580509 Chinese patent and its is answered
With hair blackening liquid includes selenourea acid, copper sulphate, nickel sulfate, zinc dihydrogen phosphate, phosphoric acid, citric acid, Octylphenol polyoxyethylene ether
And water, in which: contain 1~6g selenourea acid, 1~10g copper sulphate, 1~2g nickel sulfate, 1~5g phosphoric acid in every 1L room temperature blackening liquid
Dihydro zinc, 1~10mL phosphoric acid, 1~5g citric acid and 1~4mL Octylphenol polyoxyethylene ether, surplus are water.The invention it is normal
Warm nigrescence formula of liquid is reasonable, and film forming efficiency is high, improves the performances such as the glossiness, binding force, compactness of black film.But the hair
Temperature of the black liquor when actually blacking application is 40-60 DEG C, and the time that blacks is 10-20 minutes, and temperature is higher, and the time is longer.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of quick-acting environment-friendly type blackening agent for surface of steel room temperature and its answer
With blackening agent for surface of the invention is free of selenium, fast blackening processing can be carried out to steel surface at normal temperature in application, after processing
Gained melanism film is smooth, uniform, rub resistance.
The specific technical proposal of the invention is: a kind of quick-acting environment-friendly type blackening agent for surface of steel room temperature, including following quality percentage
Several components:
Copper sulphate 1-3%,
Nickel sulfate 0.5-4%,
Polyhydroxy aldehyde 0.5-3%,
Phytic acid 3-8%,
Citric acid 0.5-3%,
Inorganic acid 2-5%,
Alkyl phenol polyoxyethylene ether 0.5-2%,
Ammonium molybdate 1-3%,
Water surplus.
The effect of each component is as follows in inventive formulation: copper sulphate is as its Cu of main salt2+It is all the key component of film forming.
Nickel sulfate mainly plays catalytic action, can improve reaction film forming speed.The main function of polyhydroxy aldehyde is complex copper, controls its displacement
Speed, to ensure binding force.For citric acid as auxiliary complex-former, team of the present invention finds that it is multiple in specific proportions with polyhydroxy aldehyde
It can be synergistic after matching.Alkyl phenol polyoxyethylene ether mainly makes steel substrate surface lubrication, black film uniformity, can eliminate
Floating, floating grey phenomenon.The effect of inorganic acid is to maintain the stability of blackening agent for surface pH value, it is ensured that room temperature blackening operates normal table.
Phytic acid in the present invention existing complexing, have corrosion-resistant effect again, after it and metal complex, easily form one layer in metal surface
Fine and close unimolecule protective film, can effectively prevent oxygen and contacts with metallic matrix, to achieve the purpose that anti-corrosion.Ammonium molybdate is main
Play the role of passivation, catalysis, be easy to adjust, stablize, sediment it is few, can quickly form film and densification.In the association of above-mentioned each substance
It, being capable of fast filming and quality of forming film is preferable at normal temperature under same-action.
The nigrescence membrane formation mechanism of blackening agent for surface of the present invention is as follows: the principle of Chemical Colouring of Steel at Room Temperature is more complicated, is related to many oxygen
Change reduction reaction and galvanic interaction, no selenium room temperature blackening film component are not such as alkaline black film Fe3O4, but the oxidation of black
Copper.It theoretically analyzes, main following reaction occurs:
Steel substrate occurs displacement with copper ion and reacts, and the copper absorption of precipitation forms Fe-Cu battery, be accelerated into matrix surface
Film speed:
Fe+Cu2+→Cu↓+Fe2+
Fe is generated under the association of hydrogen-oxygen in iron and air3O4:
2Fe3++Fe2++8OH-→Fe3O4↓+4H2O
Mantoquita becomes the copper oxide of black eventually:
Cu2++O2-→ CuO (black)
Above-mentioned reaction occurs quickly, elapses the one layer of continuous black oxide film of densification of formation in 1-5 minutes from edge to center.It is worth
It is concerned with: oxidation reaction and being not finished after nigrescence steel takes out out of tank liquor, may continue under the action of oxygen in air
(will be slow and reacted carrying out after oil sealing) slowly is carried out, perdurabgility just terminated up to tens of hours, can reduce hair
The black time.And this conversion process can improve film strength and adhesive force, blackness, uniformity also increase,
Preferably, the inorganic acid is at least one of boric acid, phosphoric acid, phosphate buffer, dihydric phosphate.
Application of the above-mentioned quick-acting environment-friendly type blackening agent for surface of steel room temperature in steel surface melanism, comprising the following steps:
S1, oil removing: oil removing is carried out to steel surface.
S2, cleaning: to steel surface with 40-60 DEG C of hot water wash → room temperature washing → 60-70 DEG C of pickling → room temperature washing →
Room temperature washing.
Compared with the methods of common washing, pickling, the present invention uses the cleaning process of specific combination mode.Steel surface
First be conducive to further remove a small amount of greasy dirt and degreaser that remain in steel surface with hot water injection, then be made with room temperature flowing water
After further rinsing, then the oxide skin that pickling removes steel surface is carried out, secondary washing can be clear by the remaining acid solution of steel surface
Wash clean is conducive to make blackening process in next step.Under above-mentioned hot → cold → hot → cold specific combination, the temperature of steel surface
After multiple contrasts, steel surface impurity can be effectively removed, cleaning effect is outstanding.
S3, nigrescence: steel is impregnated in blackening process in the container containing nigrescence agent solution, blackening agent for surface solution temperature is
15-35 DEG C, the processing time is 1-5min, and pH value of solution maintains 1.5-3.5.
S4, washing neutralize: washing → washing → neutralization → washing.
S5, immersion oil closing.
Preferably, using electrochemical deoiling, being carried out using the metal degreasing agent solution of 3-10wt% to steel surface in S1
Oil removing.
Preferably, in S1, the formula of the degreasing agent for metal are as follows:
Sodium hydroxide 13-17wt%,
Tertiary sodium phosphate 18-22wt%,
Sodium carbonate 13-17wt%,
Sodium tripolyphosphate 3-7wt%,
Anhydrous sodium metasilicate 8-12wt%,
Calgon 3-7wt%,
Nonylphenol polyoxyethylene ether 8-12wt%,
Anhydrous sodium sulphate 18-22wt%.
The present invention uses homemade degreasing agent for metal, and deoiling effect is obvious, and speed is fast, cleans up, easy to use.
Preferably, carrying out blasting treatment to steel surface in oil removing.Blasting treatment can further be conducive to oil removing effect
Fruit.
Preferably, in S2, using the sulfuric acid solution pickling of 15-20wt%, pickling time 25-35min.
Preferably, the nigrescence agent solution is that blackening agent for surface and water in mass ratio 1: 4-6 prepare gained in S3.
Preferably, being neutralized in S4 using the sodium carbonate liquor of 3-5wt%.
Preferably, the steel and nigrescence agent solution are in magnetic field in S3, the blackening process time is 1-2min, hair
Black temperature is 15-20 DEG C；Magnetic field strength is incremented by by 0-150mT, to reach to peak value after be incremented by again by 0-150mT, recycled with this；Magnetic
Field ascending rate is 4-6mT/sec.
In order to further reduce the Darkening process time, the present invention carries out magnetic field processing to nigrescence agent solution and steel, in magnetic
Under field action, the activity of potent agent and water can substantially be enhanced in metal, black agent, to promote the life of melanism film
At.Such as metal reacts active Du Genggao under magnetic field, surfactant activity under magnetic fields is stronger, to steel surface
Wellability is more preferable；And water can be converted into subset after magnetization by macromolecular mass, surface tension changes, and activity is more
It is high.Team of the present invention through further research, it has been found that, not arbitrarily apply magnetic field can obtain good technical effect,
It is obtained after a series of researchs, carries out magnetic field strength incremented circulation according to certain rules within the scope of above-mentioned particular magnetic field strength,
Effect is best.
It should be noted that nigrescence temperature can not be excessively high when adding magnetic field, need to control at 15-20 DEG C, it can if temperature is excessively high
It causes reaction rate too fast, causes oxidation film adhesive force not high.
It is compared with the prior art, the beneficial effects of the present invention are: blackening agent for surface and technique category environment-friendly type, nothing of the present invention without selenium
It pollutes, steel surface can be quickly handled under normal temperature condition, colouring is uniformly, speed is fast, fixation power is strong, rub resistance.Through field application
And test, it is mating etc. gradually to solve the technique of industrial application, condition, packaging, plays antirust to steel surface, corrosion-resistant is made
With.
Specific embodiment
The present invention will be further described with reference to the examples below.
Total embodiment
A kind of quick-acting environment-friendly type blackening agent for surface of steel room temperature, the component including following mass percent:
Copper sulphate 1-3%,
Nickel sulfate 0.5-4%,
Polyhydroxy aldehyde 0.5-3%,
Phytic acid 3-8%,
Citric acid 0.5-3%,
Inorganic acid (at least one of boric acid, phosphoric acid, phosphate buffer, dihydric phosphate) 2-5%,
Alkyl phenol polyoxyethylene ether 0.5-2%,
Ammonium molybdate 1-3%,
Water surplus.
Application of the above-mentioned quick-acting environment-friendly type blackening agent for surface of steel room temperature in steel surface melanism, comprising the following steps:
S1, oil removing: using electrochemical deoiling, carries out oil removing to steel surface using the metal degreasing agent solution of 3-10wt%.It is described
Metal
The formula of degreaser are as follows:
Sodium hydroxide 13-17wt%,
Tertiary sodium phosphate 18-22wt%,
Sodium carbonate 13-17wt%,
Sodium tripolyphosphate 3-7wt%,
Anhydrous sodium metasilicate 8-12wt%,
Calgon 3-7wt%,
Nonylphenol polyoxyethylene ether 8-12wt%,
Anhydrous sodium sulphate 18-22wt%.
S2, cleaning: to steel surface with the pickling of 40-60 DEG C of hot water wash → room temperature washing → 60-70 DEG C (15-20wt%'s
Sulfuric acid solution, 25-35min) → room temperature washing → room temperature washing.
S3, nigrescence: steel is impregnated in the container containing nigrescence agent solution (mass ratio of blackening agent for surface and water is 1: 4-6)
Blackening process, blackening agent for surface solution temperature are 15-35 DEG C, and the processing time is 1-5min, and pH value of solution maintains 1.5-3.5.
S4, washing neutralize: washing → washing → neutralization (sodium carbonate liquor of 3-5wt%) → washing.
S5, immersion oil closing.
Preferably, in oil removing, blasting treatment is carried out to steel surface.Blasting treatment can further be conducive to oil removing effect
Fruit.
Preferably, in S3, the steel and nigrescence agent solution are in magnetic field, and the blackening process time is 1-2min；Magnetic field
Intensity is incremented by by 0-150mT, to reach to peak value after be incremented by again by 0-150mT, recycled with this；Magnetic field ascending rate is 4-6mT/
sec。
Embodiment 1-5
The blackening agent for surface specific formula of embodiment 1-5 in table 1 are as follows:
Embodiment 1: copper sulphate 1%, nickel sulfate 1.5%, polyhydroxy aldehyde 2%, phytic acid 4%, citric acid 0.5%, boric acid 1%, phosphorus
Acid 2%, alkyl phenol polyoxyethylene ether 1%, ammonium molybdate 1.5%, water surplus.
Embodiment 2: copper sulphate 3%, nickel sulfate 3%, polyhydroxy aldehyde 3%, phytic acid 3%, citric acid 3%, boric acid 1%, phosphorus
Sour 2%, phosphate buffer 2%, alkyl phenol polyoxyethylene ether 2%, ammonium molybdate 1%, water surplus.
Embodiment 3: copper sulphate 1%, nickel sulfate 2%, polyhydroxy aldehyde 3%, phytic acid 3%, citric acid 2%, phosphate buffer
2%, dihydric phosphate 1%, alkyl phenol polyoxyethylene ether 1%, ammonium molybdate 2%, water surplus.
Embodiment 4: copper sulphate 2%, nickel sulfate 2%, polyhydroxy aldehyde 2%, phytic acid 5%, citric acid 3%, boric acid 2%, phosphorus
Acid dihydride salt 1%, alkyl phenol polyoxyethylene ether 2%, ammonium molybdate 1%, water surplus.
Embodiment 5: copper sulphate 1%, nickel sulfate 0.5%, polyhydroxy aldehyde 0.5%, phytic acid 3%, citric acid 3%, boric acid
1%, phosphatase 11 %, phosphate buffer 3%, alkyl phenol polyoxyethylene ether 0.5%, ammonium molybdate 1%, water surplus.
Application of the above-mentioned quick-acting environment-friendly type blackening agent for surface of steel room temperature in steel surface melanism, comprising the following steps:
S1, oil removing: using electrochemical deoiling, carries out oil removing to steel surface using the metal degreasing agent solution of 6wt%.The metal
The formula of degreaser are as follows:
Sodium hydroxide 15wt%,
Tertiary sodium phosphate 20wt%,
Sodium carbonate 15wt%,
Sodium tripolyphosphate 5wt%,
Anhydrous sodium metasilicate 10wt%,
Calgon 5wt%,
Nonylphenol polyoxyethylene ether 10wt%,
Anhydrous sodium sulphate 20wt%.
S2, cleaning: to steel surface, with → 65 DEG C of pickling of 50 DEG C of hot water wash → 25 DEG C room temperature washings, (sulfuric acid of 18wt% is molten
Liquid, 30min) → room temperature washing → room temperature washing.
S3, nigrescence: steel is impregnated in the container containing nigrescence agent solution (mass ratio of blackening agent for surface and water is 1: 5) and is sent out
Black processing, blackening agent for surface solution temperature are 25 DEG C, and the processing time is 3min, and pH value of solution maintains 1.5-3.5.
S4, washing neutralize: washing → washing → neutralization (sodium carbonate liquor of 4wt%) → washing.
S5, immersion oil closing.
Blackening effect comparison is carried out to gained steel oxidation film after embodiment 1-5 processing, the results are shown in Table 1.
Table 1- embodiment 1-5 is formulated blackening effect comparison
As shown in Table 1, the blackening effect of embodiment 1 and 4 is best, and embodiment 3 is taken second place, and embodiment 2 and 5 is third.
Embodiment 6
Steel surface processing is carried out using the melanism agent prescription of embodiment 1:
S1, oil removing: using electrochemical deoiling, carries out oil removing to steel surface using the metal degreasing agent solution of 6wt%.The metal
The formula of degreaser are as follows:
Sodium hydroxide 15%,
Tertiary sodium phosphate 20%,
Sodium carbonate 15%,
Sodium tripolyphosphate 5%,
Anhydrous sodium metasilicate 10%,
Calgon 5%,
Nonylphenol polyoxyethylene ether 10%,
Anhydrous sodium sulphate 20%.
S2, cleaning: to steel surface, with → 65 DEG C of pickling of 50 DEG C of hot water wash → 25 DEG C room temperature washings, (sulfuric acid of 18wt% is molten
Liquid, 30min) → room temperature washing → room temperature washing.
S3, nigrescence: steel is impregnated in the container containing nigrescence agent solution (mass ratio of blackening agent for surface and water is 1: 5) and is sent out
Black processing.Wherein, steel and nigrescence agent solution are in magnetic field, and magnetic field strength is incremented by by 0-150mT, to reach to peak value after again by
0-150mT is incremented by, and is recycled with this；Magnetic field ascending rate is 5mT/sec.Blackening agent for surface solution temperature be 15 DEG C, processing the time be
1.5min, pH value of solution maintain 1.5-3.5.
S4, washing neutralize: washing → washing → neutralization (sodium carbonate liquor of 4wt%) → washing.
S5, immersion oil closing.
Embodiment 7
Embodiment 7 and the difference of embodiment 6 are only that, in oil removing, carry out blasting treatment to steel surface.Blasting treatment can be into
One step is conducive to deoiling effect.
As shown in table 2, blackening agent for surface of the present invention compared with other commercial like product there is nothing during nontoxic, nigrescence to have
Poisonous substance generates, free from environmental pollution；Work efficiency is high, and nigrescence temperature is low, the time is short, film layer dense uniform and advantage at low cost.
Table 2- room temperature is without selenium hair blackening liquid compared with existing commercially available hair blackening liquid
Comparative example 1-2
Comparative example 1-2 and the difference of embodiment 1 be only that, black agent solution concentration is different when application, and wherein 1 concentration of comparative example is
Blackening agent for surface: water=1: 3,2 concentration of comparative example is blackening agent for surface: water=1: 7.
After carrying out Darkening process using same process, the excessive concentration of comparative example 1 is found, film forming speed is too fast, causes
Film layer is more loose, and binding force is bad；And then concentration is too low for comparative example 2, nigrescence speed is slow.
Comparative example 3-4
Comparative example 3-4 and the difference of embodiment 1 be only that, black agent pH value of solution range is different when application, wherein pH in comparative example 3
Control is 1, and pH control is 4 in comparative example 4.
After carrying out Darkening process using same process, team's discovery pH value of the present invention is the one most heavy of influence blackening effect
The parameter wanted.PH value is excessively high in comparative example 4, and film forming speed is slow, or even the film forming that cannot black；PH value is too low in comparative example 3, then instead
Excessive velocities are answered, binding force is bad, and can dissolve the film layer of generation with further decreasing for pH value.Therefore pH needs stringent control
System can be adjusted between 1.5~3.5 with nitric acid or ammonium hydroxide when necessary.
Comparative example 5-6
Comparative example 5-6 and the difference of embodiment 1 be only that, melanism temperature is different when application, and wherein nigrescence temperature is in comparative example 5
10 DEG C, nigrescence temperature is 40 DEG C in comparative example 6.
After carrying out Darkening process, the nigrescence temperature of comparative example 5 is too low, and reaction speed is slower, and blackness and uniformity are poor.Comparison
Temperature is higher than 40 DEG C in example 6, and reaction speed is too fast, but it is poor to also result in binding force, therefore nigrescence temperature needs stringent control
System is at 15~35 DEG C.
Comparative example 7-8
Comparative example 7-8 and the difference of embodiment 1 be only that, the melanism time is different when application, and the time that wherein blacks in comparative example 7 is
10min, the time that blacks in comparative example 8 is 1min.
After carrying out Darkening process, the time is too short in comparative example 8, then not exclusively, film layer is excessively thin, there is piebald for film growth.Comparison
Black overlong time in example 7, then surface can be too much black oxide, and redundance is loose, and binding force is bad or even surface
It is rubescent.
Comparative example 9
Comparative example 9 and the difference of embodiment 6 be only that, when application applies the stationary magnetic field of 150mT.Carry out the melanism of same time
After processing, not exclusively, film layer is excessively thin, there is piebald for the film growth in comparative example 9.It follows that the acceleration effect phase of stationary magnetic field
It is poorer than embodiment 6.
Raw materials used in the present invention, equipment is unless otherwise noted the common raw material, equipment of this field；In the present invention
Method therefor is unless otherwise noted the conventional method of this field.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification, change and equivalent transformation to the above embodiments, still fall within the technology of the present invention side
The protection scope of case.
Claims (9)
1. a kind of quick-acting environment-friendly type blackening agent for surface of steel room temperature, which is characterized in that the component including following mass percent:
Copper sulphate 1-3%,
Nickel sulfate 0.5-4%,
Polyhydroxy aldehyde 0.5-3%,
Phytic acid 3-8%,
Citric acid 0.5-3%,
Inorganic acid 2-5%,
Alkyl phenol polyoxyethylene ether 0.5-2%,
Ammonium molybdate 1-3%,
Water surplus.
2. a kind of quick-acting environment-friendly type blackening agent for surface of steel room temperature as described in claim 1, which is characterized in that the inorganic acid is boron
At least one of acid, phosphoric acid, phosphate buffer, dihydric phosphate.
3. application of the quick-acting environment-friendly type blackening agent for surface of steel room temperature as described in claim 1 in steel surface melanism, feature
Be the following steps are included:
S1, oil removing: oil removing is carried out to steel surface；
S2, cleaning: to steel surface 40-60 DEG C of hot water wash → room temperature washing → 60-70 DEG C of pickling → room temperature washing → room temperature
Washing；
S3, nigrescence: steel is impregnated in blackening process in the container containing nigrescence agent solution, blackening agent for surface solution temperature is 15-35
DEG C, the processing time is 1-5min, and pH value of solution maintains 1.5-3.5；
S4, washing neutralize: washing → washing → neutralization → washing；
S5, immersion oil closing.
4. application as claimed in claim 3, which is characterized in that in S1, using electrochemical deoiling, removed using the metal of 3-10wt%
Finish solution carries out oil removing to steel surface.
5. application as claimed in claim 4, which is characterized in that in S1, the formula of the degreasing agent for metal are as follows:
Sodium hydroxide 13-17wt%,
Tertiary sodium phosphate 18-22wt%,
Sodium carbonate 13-17wt%,
Sodium tripolyphosphate 3-7wt%,
Anhydrous sodium metasilicate 8-12wt%,
Calgon 3-7wt%,
Nonylphenol polyoxyethylene ether 8-12wt%,
Anhydrous sodium sulphate 18-22wt%.
6. application as claimed in claim 3, which is characterized in that in S2, using the sulfuric acid solution pickling of 15-20wt%, when pickling
Between be 25-35min.
7. application as claimed in claim 3, which is characterized in that in S3, the nigrescence agent solution is that blackening agent for surface and water press quality
Gained is prepared than 1:4-6.
8. application as claimed in claim 3, which is characterized in that in S4, neutralized using the sodium carbonate liquor of 3-5wt%.
9. application as claimed in claim 3, which is characterized in that in S3, the steel and nigrescence agent solution are in magnetic field, hair
The black processing time is 1-2min, and nigrescence temperature is 15-20 DEG C；Magnetic field strength is incremented by by 0-150mT, to reach to peak value after again by 0-
150mT is incremented by, and is recycled with this；Magnetic field ascending rate is 4-6mT/sec.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910400987.9A CN110158069B (en) | 2019-05-14 | 2019-05-14 | Normal-temperature quick-acting environment-friendly steel blackening agent and application thereof |
Applications Claiming Priority (1)
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| CN114059055A (en) * | 2021-11-12 | 2022-02-18 | 常州硕和机械有限公司 | Surface anticorrosion treatment method for automobile air conditioner compressor |
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