CN103046038A - Room temperature blackening agent suitable for iron casting and method for preparing room temperature blackening agent suitable for iron casting - Google Patents
Room temperature blackening agent suitable for iron casting and method for preparing room temperature blackening agent suitable for iron casting Download PDFInfo
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- CN103046038A CN103046038A CN201210518043XA CN201210518043A CN103046038A CN 103046038 A CN103046038 A CN 103046038A CN 201210518043X A CN201210518043X A CN 201210518043XA CN 201210518043 A CN201210518043 A CN 201210518043A CN 103046038 A CN103046038 A CN 103046038A
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Abstract
The invention provides a room temperature blackening agent suitable for an iron casting and a method for preparing the room temperature blackening agent suitable for the iron casting. Each liter of the blackening agent is prepared from the following raw materials: 1-3 grams of sodium molybdate, 2-6 grams of copper sulfate, 1-3 grams of nickel sulfate, 1-3 grams of complexing agent, 4-8 grams of coalescing agent, 0.3-1.5 grams of additive, 0.5-3 grams of polyethylene glycol, 0.5-3 grams of oleate and the balance of water, wherein the pH is between 2.0 and 3.0. The room temperature blackening agent suitable for the iron casting provided by the invention is the room temperature blackening agent which is environment-friendly, is toxicity-free, has strong adaptability and an excellent rust-proof function and does not contain harmful substances such as strong acid, strong alkali, phosphorus, selenium, nitrite and the like; and the room temperature blackening agent can form a layer of black film which is black, bright and uniform and has high firmness and strong corrosion resistance on workpiece surfaces.
Description
Technical field
The present invention relates to field of metal surface treatment, relate in particular to a kind of room temperature blacking liquid that is applicable to ironcasting and preparation method thereof.
Background technology
The blackening process of iron and steel (claiming again oxide treatment) is a kind of process for treating surface.The oxide treatment of iron and steel can make surface of steel workpiece generate the compound (such as oxide compound) of protective, and the part after the oxide treatment carries out immersion oil again and other fills processing, can further improve the solidity to corrosion of rete.
At present, the blackening method commonly used of ferrous materials has: the alkali electroless oxidation style claims again alkalescence turn blue (blackout); The acidic chemical oxidation style claims again room temperature blackening.What its neutral and alkali blackout was the most frequently used is to utilize NaOH-NaNO
2The high temperature oxidation system generates Z 250 (Fe
3O
4) be the oxide film of main component, its rete is fine and smooth, evenly, brilliant black, fastness be high, corrosion resistance and good, but NaOH-NaNO
2High temperature oxidation system process energy consumption height, length consuming time, alkaline corrosion fog are serious, contain carcinogens-nitrite in waste residue and the waste liquid, and selective to steel in the actual production, particularly cast iron, steel alloy etc. are difficult to upper film.And the representational Cu-Se of the being room temperature blackening system of acid blackout finally generates black copper selenide (CuSe) through series of chemical and is bonded in steel surface and forms the melanism film, this technological temperature requires low, easy to operate, resulting rete erosion resistance after closing process is processed is better, the melanism film is loose, sticking power is low but normal temperature Cu-Se blackout system generates, it is more to generate precipitation in the blackout process, contain toxic substance selenium element in its working fluid, the waste liquid that produces, waste residue all are harmful to human body and environment.
Many investigators have carried out a large amount of research to blackening in recent years, but the blackening process to ironcasting is then rarely found, although part Study person has made some progress, but mostly the pollutant such as phosphorous in the treatment solution, selenium, nitrite or complex procedures, cost are higher, and after ironcasting is turned black, for preventing its surface oxidisation, also need to immerse again and carry out antirust processing in the another kind of solvent, and can not reach simultaneously the antirust function of blackout, increased the complicacy of operation.
Summary of the invention
The object of the invention is to solve the defective that above-mentioned prior art exists, provide that a kind of nontoxic, environmental protection, preparation are simple and easy, the room temperature blacking liquid of institute's film forming layer superior performance.
A kind of nontoxic, environmental protection, preparation are simple and easy, the preparation method of the room temperature blacking liquid of institute's film forming layer superior performance providing for another object of the present invention.
A kind of room temperature blacking liquid that is applicable to ironcasting, every liter of blackening agent for surface is made by following raw material: Sodium orthomolybdate: 1～3g, copper sulfate: 2～6g, single nickel salt: 1～3g, complexing agent: 1～3g, film coalescence aid: 4～8g, additive: 0.3～1.5g, polyoxyethylene glycol 0.5～3g, oleate: 0.5～3g, surplus is water, and pH is 2.0～3.0.
Further, be applicable to as mentioned above the room temperature blacking liquid of ironcasting, described complexing agent is one or more in Seignette salt, xitix, disodium ethylene diamine tetraacetate, Tripotassium Citrate sodium, the sulphosalicylic acid.
Further, be applicable to as mentioned above the room temperature blacking liquid of ironcasting, described film coalescence aid is one or more in ammonium thiosulfate, ferrous sulfate, iron protochloride, the inferior manganese of carbonic acid.
Further, be applicable to as mentioned above the room temperature blacking liquid of ironcasting, described additive is one or more in Sodium Silicofluoride, Starso, the potassium silicofluoride.
Further, be applicable to as mentioned above the room temperature blacking liquid of ironcasting, described oleate is one or more in sodium oleate, fluorocarbon resin, the pure-acrylic emulsion.
Further, be applicable to as mentioned above the room temperature blacking liquid of ironcasting, described pH is 2.0～3.0th, is one or more solution adjustment in 25% citric acid, oxalic acid, the acetic acid with massfraction.
A kind of preparation method who is applicable to as mentioned above the room temperature blacking liquid of ironcasting may further comprise the steps:
A, according to the proportioning raw materials of the room temperature blacking liquid that is applicable to as mentioned above ironcasting, with stirring in Sodium orthomolybdate and the copper sulfate adding part water it is dissolved fully first, add successively single nickel salt, complexing agent, film coalescence aid, additive and stirring again it is fully dissolved, it is for subsequent use to make blackening agent for surface A component;
B, polyoxyethylene glycol and oleate fully are dissolved in the part water, it is for subsequent use to make blackening agent for surface B component again;
C, will fill into remaining water after blackening agent for surface A component and the blackening agent for surface B component mixing and stirring, regulating the pH value with the pH adjusting agent again is 2.0～3.0, namely gets the room temperature blacking liquid that is applicable to ironcasting again.
Further, be applicable to as mentioned above the preparation method of the room temperature blacking liquid of ironcasting, the used part water of described step (a) is 1/2 of whole water.
Further, be applicable to as mentioned above the preparation method of the room temperature blacking liquid of ironcasting, the used part water of described step (b) is 1/3 of whole water.
Further, be applicable to as mentioned above the preparation method of the room temperature blacking liquid of ironcasting, described complexing agent is Seignette salt, xitix, disodium ethylene diamine tetraacetate, Tripotassium Citrate sodium, in the sulphosalicylic acid one or more, described film coalescence aid is ammonium thiosulfate, ferrous sulfate, iron protochloride, in the inferior manganese of carbonic acid one or more, described additive is Sodium Silicofluoride, Starso, in the potassium silicofluoride one or more, described oleate is sodium oleate, fluorocarbon resin, in the pure-acrylic emulsion one or more, described pH adjusting agent are that massfraction is 25% citric acid, oxalic acid, one or more solution in the acetic acid are adjusted.
The room temperature blacking liquid that is applicable to ironcasting provided by the invention is that a kind of environmental protection, nontoxic, suitability are strong and the room temperature blacking liquid of excellent antirust function is arranged, and does not contain the objectionable impuritiess such as strong acid, highly basic, phosphorus, selenium, nitrite; Can form the blackout rete that one deck is shiny black, even, fastness is high, erosion resistance is strong at workpiece surface.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with the embodiment among the present invention, the technical scheme among the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The invention provides a kind of room temperature blacking liquid that is applicable to ironcasting, every liter of blackening agent for surface is made by following raw material: Sodium orthomolybdate: 1～3g, copper sulfate: 2～6g, single nickel salt: 1～3g, complexing agent: 1～3g, film coalescence aid: 4～8g, additive: 0.3～1.5g, polyoxyethylene glycol 0.5～3g, oleate: 0.5～3g, surplus is water, and pH is 2.0～3.0.
According to the room temperature blacking liquid that is applicable to ironcasting provided by the invention, in the preferred case, described complexing agent is that Seignette salt, described film coalescence aid are that ammonium thiosulfate, described additive are that Sodium Silicofluoride, described oleate are that sodium oleate, described pH are 2.0～3.0th, is 25% citric acid solution adjustment with massfraction.
Complexing agent of the present invention mainly plays stabilizing solution, reduce sediment, can control speed of response and regulate the effect of acidity, because of complexing agent energy complex copper ion, on the one hand can prevent from forming the copper hydroxide precipitation, but reaction speed on the other hand is organic acid such as complexing agent, can reduce the pH value, in addition, complexing agent of the present invention can also for other have can complex copper ion material, such as xitix, disodium ethylene diamine tetraacetate, Tripotassium Citrate sodium, sulphosalicylic acid etc.
A kind of preparation method who is applicable to as mentioned above the room temperature blacking liquid of ironcasting may further comprise the steps:
A, according to the proportioning raw materials of the room temperature blacking liquid that is applicable to as mentioned above ironcasting, with stirring in Sodium orthomolybdate and the copper sulfate adding part water it is dissolved fully first, add successively single nickel salt, complexing agent, film coalescence aid, additive and stirring again it is fully dissolved, it is for subsequent use to make blackening agent for surface A component;
B, polyoxyethylene glycol and oleate fully are dissolved in the part water, it is for subsequent use to make blackening agent for surface B component again;
C, will fill into remaining water after blackening agent for surface A component and the blackening agent for surface B component mixing and stirring, regulating the pH value with the pH adjusting agent again is 2.0～3.0, namely gets the room temperature blacking liquid that is applicable to ironcasting again.
According to the preparation method who is applicable to the room temperature blacking liquid of ironcasting provided by the invention, in the preferred case, the used part water of described step (a) is 1/2 of whole water, and the used part water of described step (b) is 1/3 of whole water.Described complexing agent is Seignette salt, and described film coalescence aid is ammonium thiosulfate, and described additive is Sodium Silicofluoride, and described oleate is sodium oleate, and described pH adjusting agent is that massfraction is 25% citric acid solution adjustment.
Film coalescence aid effect of the present invention is to make and exists in the blackening agent for surface than the more negative strong reductant in ferroelectric position, it can be under the catalysis of steel surface, with molybdate generation redox reaction, the reduction decomposition of accelerating molybdate obtains active oxygen, and then generation black CuO, therefore, film coalescence aid of the present invention can also can and then generate the material of black CuO with molybdate generation redox reaction for other, as: ferrous sulfate, iron protochloride, the inferior manganese of carbonic acid etc.
Additive of the present invention is when stopping film formation reaction, and the workpiece surface rete is solidified thereupon, does not fall to floating ash, combination firmly to reach rete.Therefore, additive of the present invention can also can stop film formation reaction and the workpiece surface rete is solidified thereupon for other has, and does not fall to floating firmly material of ash, combination to reach rete, as: Starso, potassium silicofluoride etc.
The effect of described oleate is that generating the solid space network structure with the polyoxyethylene glycol acting in conjunction is covered in workpiece surface, has hydrophobic, antirust function.It can also have for other material of film forming anti-corrosion function, as: fluorocarbon resin, pure-acrylic emulsion etc.
PH adjusting agent of the present invention can also be other acidic substance, as: oxalic acid, acetic acid etc.
The below will be described in more detail the present invention by specific embodiment.
Embodiment 1:
1, blackening agent for surface preparation
(a) get first the 500ml deionized water, add 1g Sodium orthomolybdate and 2g copper sulfate, and stirring is dissolved it fully;
(b) add successively 1g single nickel salt, 2g Seignette salt, 4g ammonium thiosulfate, 0.5g Sodium Silicofluoride in the obtained work in-process of step (a), a kind of medicament of every adding need stir it is fully dissolved, and finally makes blackening agent for surface A component;
(c) get the 200ml deionized water, add 0.5g polyoxyethylene glycol, fully dissolving of 0.8g sodium oleate stirring, it is for subsequent use to make blackening agent for surface B component;
(d) will add deionized water to 1L after the work in-process mixing and stirring that makes among step (b), (c), again take the lemon acid for adjusting pH value of massfraction as 25% as 2.0, both blackening agent for surface of the present invention.
2, blackening
(1) Iron Casting Surface pre-treatment
Degreasing (oil removing) → washing → rust cleaning → washing
(2) blackening process
Pretreated workpiece is placed blackening agent for surface of the present invention, and the treatment time is 5min, and the pH value is 2.0, and treatment temp is normal temperature.
(3) aftertreatment
Sky stops 2min after the blackout, and washing is dried naturally again.
Embodiment 2:
1, blackening agent for surface preparation
(a) get first the 600ml deionized water, add 2g Sodium orthomolybdate and 4g copper sulfate, and stirring is dissolved it fully;
(b) add successively 2g single nickel salt, 3g Seignette salt, 6g ammonium thiosulfate, 1.0g Sodium Silicofluoride in the obtained work in-process of step (a), a kind of medicament of every adding need stir it is fully dissolved, and finally makes blackening agent for surface A component;
(c) get the 300ml deionized water, add 0.5g polyoxyethylene glycol, fully dissolving of 0.8g sodium oleate stirring, it is for subsequent use to make blackening agent for surface B component;
(d) will add deionized water to 1L after the work in-process mixing and stirring that makes among step (b), (c), again take the lemon acid for adjusting pH value of massfraction as 25% as 2.5, both blackening agent for surface of the present invention.
2, blackening
(1) Iron Casting Surface pre-treatment
Degreasing (oil removing) → washing → rust cleaning → washing
(2) blackening process
Pretreated workpiece is placed blackening agent for surface, and the treatment time is 5min, and the pH value is 2.0, and treatment temp is normal temperature.
(3) aftertreatment
Sky stops 2min after the blackout, and washing is dried naturally again.
Embodiment 3:
1, blackening agent for surface preparation
(a) get first the 600ml deionized water, add 1.5g Sodium orthomolybdate and 3g copper sulfate, and stirring is dissolved it fully;
(b) add successively 1.5g single nickel salt, 2g Seignette salt, 4g ammonium thiosulfate, 0.5g Sodium Silicofluoride in the obtained work in-process of step (a), a kind of medicament of every adding need stir it is fully dissolved, and finally makes blackening agent for surface A component;
(c) get the 250ml deionized water, add 1.0g polyoxyethylene glycol, fully dissolving of 1.2g sodium oleate stirring, it is for subsequent use to make blackening agent for surface B component;
(d) will add deionized water to 1L after the work in-process mixing and stirring that makes among step (b), (c), again take the lemon acid for adjusting pH value of massfraction as 25% as 2.5, both blackening agent for surface of the present invention.
2, blackening
(1) Iron Casting Surface pre-treatment
Degreasing (oil removing) → washing → rust cleaning → washing
(2) blackening process
Pretreated workpiece is placed blackening agent for surface, and the treatment time is 8min, and the pH value is 2.5, and treatment temp is normal temperature.
(c) aftertreatment
Sky stops 2min after the blackout, and washing is dried naturally again
Embodiment 4:
1, blackening agent for surface preparation
(a) get first the 600ml deionized water, add 2g Sodium orthomolybdate and 4g copper sulfate, and stirring is dissolved it fully;
(b) add successively 2g single nickel salt, 3g Seignette salt, 6g ammonium thiosulfate, 1.0g Sodium Silicofluoride in step (a) obtained work in-process, a kind of medicament of every adding need stir it is fully dissolved, and finally makes blackening agent for surface A component;
(c) get the 250ml deionized water, add 1.5g polyoxyethylene glycol, fully dissolving of 2.0g sodium oleate stirring, it is for subsequent use to make blackening agent for surface B component;
(d) will add deionized water to 1L after the work in-process mixing and stirring that makes among step (b), (c), again take the lemon acid for adjusting pH value of massfraction as 25% as 2.5, both blackening agent for surface of the present invention.
2, blackening
(1) Iron Casting Surface pre-treatment
Degreasing (oil removing) → washing → rust cleaning → washing
(2) blackening process
Pretreated workpiece is placed blackening agent for surface, and the treatment time is 8min, and the pH value is 2.5, and treatment temp is normal temperature.
(3) aftertreatment
Sky stops 2min after the blackout, and washing is dried naturally again
Embodiment 5:
1, blackening agent for surface preparation
(a) get first the 500ml deionized water, add 3g Sodium orthomolybdate and 6g copper sulfate, and stirring is dissolved it fully;
(b) add successively 2g single nickel salt, 2g xitix, 8g ammonium thiosulfate, 1.0g Starso in step (a) obtained work in-process, a kind of medicament of every adding need stir it is fully dissolved, and finally makes blackening agent for surface A component;
(c) get the 350ml deionized water, add 2g polyoxyethylene glycol, fully dissolving of 2g sodium oleate stirring, it is for subsequent use to make blackening agent for surface B component;
(d) will add deionized water to 1L after the work in-process mixing and stirring that makes among step (b), (c), regulate the pH value as 3 take the oxalic acid of massfraction as 25% again, both blackening agent for surface of the present invention.
2, blackening
(1) Iron Casting Surface pre-treatment
Degreasing (oil removing) → washing → rust cleaning → washing
(2) blackening process
Pretreated workpiece is placed blackening agent for surface, and the treatment time is 5min, and the pH value is 3, and treatment temp is normal temperature.
(3) aftertreatment
Sky stops 2min after the blackout, and washing is dried naturally again.
Embodiment 6:
1, blackening agent for surface preparation
(a) get first the 600ml deionized water, add 2g Sodium orthomolybdate and 5g copper sulfate, and stirring is dissolved it fully;
(b) add successively 3g single nickel salt, 1g Seignette salt, 5g ferrous sulfate, 0.3g Sodium Silicofluoride in step (a) obtained work in-process, a kind of medicament of every adding need stir it is fully dissolved, and finally makes blackening agent for surface A component;
(c) get the 400ml deionized water, add 3g polyoxyethylene glycol, fully dissolving of 3g fluorocarbon resin stirring, it is for subsequent use to make blackening agent for surface B component;
(d) will add deionized water to 1L after the work in-process mixing and stirring that makes among step (b), (c), again take the vinegar acid for adjusting pH value of massfraction as 25% as 3, both blackening agent for surface of the present invention.
2, blackening
(1) Iron Casting Surface pre-treatment
Degreasing (oil removing) → washing → rust cleaning → washing
(2) blackening process
Pretreated workpiece is placed blackening agent for surface, and the treatment time is 5min, and the pH value is 2, and treatment temp is normal temperature.
(3) aftertreatment
Sky stops 3min after the blackout, and washing is dried naturally again.
Embodiment 7:
1, blackening agent for surface preparation
(a) get first the 500ml deionized water, add 2.5g Sodium orthomolybdate and 4g copper sulfate, and stirring is dissolved it fully;
(b) add successively 2g single nickel salt, 2g Seignette salt, 5g ammonium thiosulfate, 1.5g potassium silicofluoride in step (a) obtained work in-process, a kind of medicament of every adding need stir it is fully dissolved, and finally makes blackening agent for surface A component;
(c) get the 300ml deionized water, add 0.5g polyoxyethylene glycol, fully dissolving of 0.5g pure-acrylic emulsion stirring, it is for subsequent use to make blackening agent for surface B component;
(d) will add deionized water to 1L after the work in-process mixing and stirring that makes among step (b), (c), regulate the pH value as 2.5 take citric acid, the oxalic acid of massfraction as 25% again, both blackening agent for surface of the present invention.
2, blackening
(1) Iron Casting Surface pre-treatment
Degreasing (oil removing) → washing → rust cleaning → washing
(2) blackening process
Pretreated workpiece is placed blackening agent for surface, and the treatment time is 6min, and the pH value is 2.5, and treatment temp is normal temperature.
(3) aftertreatment
Sky stops 4min after the blackout, and washing is dried naturally again.
Embodiment 8:
1, blackening agent for surface preparation
(a) get first the 500ml deionized water, add 1g Sodium orthomolybdate and 2g copper sulfate, and stirring is dissolved it fully;
(b) add successively mixture, 4g ammonium thiosulfate, the 0.5g Sodium Silicofluoride of 1g single nickel salt, 2g Seignette salt and disodium ethylene diamine tetraacetate in the obtained work in-process of step (a), a kind of medicament of every adding need stir it is fully dissolved, and finally makes blackening agent for surface A component;
(c) get the 200ml deionized water, add 0.5g polyoxyethylene glycol, fully dissolving of 0.8g sodium oleate stirring, it is for subsequent use to make blackening agent for surface B component;
(d) will add deionized water to 1L after the work in-process mixing and stirring that makes among step (b), (c), again take the lemon acid for adjusting pH value of massfraction as 25% as 2.0, both blackening agent for surface of the present invention.
2, blackening
(1) Iron Casting Surface pre-treatment
Degreasing (oil removing) → washing → rust cleaning → washing
(2) blackening process
Pretreated workpiece is placed blackening agent for surface of the present invention, and the treatment time is 5min, and the pH value is 2.0, and treatment temp is normal temperature.
(3) aftertreatment
Sky stops 2min after the blackout, and washing is dried naturally again.
Embodiment 9:
1, blackening agent for surface preparation
(a) get first the 600ml deionized water, add 2g Sodium orthomolybdate and 4g copper sulfate, and stirring is dissolved it fully;
(b) add successively mixture, the 1.0g Sodium Silicofluoride of 2g single nickel salt, 3g Seignette salt, 6g ferrous sulfate and iron protochloride in the obtained work in-process of step (a), a kind of medicament of every adding need stir it is fully dissolved, and finally makes blackening agent for surface A component;
(c) get the 300ml deionized water, add 0.5g polyoxyethylene glycol, fully dissolving of 0.8g sodium oleate stirring, it is for subsequent use to make blackening agent for surface B component;
(d) will add deionized water to 1L after the work in-process mixing and stirring that makes among step (b), (c), again take the lemon acid for adjusting pH value of massfraction as 25% as 2.5, both blackening agent for surface of the present invention.
2, blackening
(1) Iron Casting Surface pre-treatment
Degreasing (oil removing) → washing → rust cleaning → washing
(2) blackening process
Pretreated workpiece is placed blackening agent for surface, and the treatment time is 5min, and the pH value is 2.0, and treatment temp is normal temperature.
(3) aftertreatment
Sky stops 2min after the blackout, and washing is dried naturally again.
Embodiment 10:
1, blackening agent for surface preparation
(a) get first the 600ml deionized water, add 1.5g Sodium orthomolybdate and 3g copper sulfate, and stirring is dissolved it fully;
(b) add successively the mixture of 1.5g single nickel salt, 2g Seignette salt, 4g ammonium thiosulfate, 0.5g Sodium Silicofluoride and Starso in the obtained work in-process of step (a), a kind of medicament of every adding need stir it is fully dissolved, and finally makes blackening agent for surface A component;
(c) get the 250ml deionized water, the mixture that adds 1.0g polyoxyethylene glycol, 1.2g sodium oleate and fluorocarbon resin stirs fully dissolving, and it is for subsequent use to make blackening agent for surface B component;
(d) will add deionized water to 1L after the work in-process mixing and stirring that makes among step (b), (c), again take the lemon acid for adjusting pH value of massfraction as 25% as 2.5, both blackening agent for surface of the present invention.
2, blackening
(1) Iron Casting Surface pre-treatment
Degreasing (oil removing) → washing → rust cleaning → washing
(2) blackening process
Pretreated workpiece is placed blackening agent for surface, and the treatment time is 8min, and the pH value is 2.5, and treatment temp is normal temperature.
(c) aftertreatment
Sky stops 2min after the blackout, and washing is dried naturally again
Because the ironcasting rete is estimated and industry standard or the national standard of detection method, therefore tests with chemical rete examination criteria commonly used.
(1), utilize the embodiment of the invention 1～4 blackening to carry out related experiment, the processing sample is grey casting, institute's film forming layer testing method and result are as follows:
1, film forming outward appearance: observation post's film forming layer outward appearance, place for some time observation and whether get rusty;
2, rete wear resistance:, carry out the friction number of times when record exposes matrix with LJ-810 rub resistance trier one rubber frictional experiment with reference to the wear test method of GB 5932-1986 light industrial goods metal plating and chemical treatment layer.
3, the corrosion-resistant experiment of rete: with reference to the testing method of GBT 5936-1986 light industrial goods ferrous metal chemical coating, the dipping topical application;
On rete, observe the time (with timing second) that shows variation with 3% copper sulfate drop
4, do simultaneous test with other blackening agent for surface and technique, comprehensive evaluation
Contrast technique: conventional high-temperature alkalescence blackening.High-temperature alkaline blackout prescription: sodium hydroxide 390g/L, Sodium Nitrite 390g/L, surplus is water; Technique is: 135 ℃ for the treatment of temps, treatment time 30min.
(2), result and analysis
Different blackening agent for surface and technique institute film forming properties detected result such as following table:
As seen from the above table, room temperature blacking liquid of the present invention exceeds the high-temperature alkaline blackening agent for surface to the treatment effect of ironcasting, blackening agent for surface of the present invention institute film forming layer, and color is pitch black, even, fastness is high, thickness can be adjusted as requested.Especially in the situation of not flooding encapsulant (slushing oil or aqueous rust preventive), there was not red rusty stain in about 3 days.Room temperature blacking liquid of the present invention preparation is simple, treatment process is low, easy to operate to environmental requirement, toxicological harmless, pollution-free etc., has many advantages.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. room temperature blacking liquid that is applicable to ironcasting, it is characterized in that every liter of blackening agent for surface is made by following raw material: Sodium orthomolybdate: 1～3g, copper sulfate: 2～6g, single nickel salt: 1～3g, complexing agent: 1～3g, film coalescence aid: 4～8g, additive: 0.3～1.5g, polyoxyethylene glycol 0.5～3g, oleate: 0.5～3g, surplus is water, pH is 2.0～3.0.
2. room temperature blacking liquid according to claim 1 is characterized in that, described complexing agent is one or more in Seignette salt, xitix, disodium ethylene diamine tetraacetate, Tripotassium Citrate sodium, the sulphosalicylic acid.
3. room temperature blacking liquid according to claim 1 is characterized in that, described film coalescence aid is one or more in ammonium thiosulfate, ferrous sulfate, iron protochloride, the inferior manganese of carbonic acid.
4. room temperature blacking liquid according to claim 1 is characterized in that, described additive is one or more in Sodium Silicofluoride, Starso, the potassium silicofluoride.
5. room temperature blacking liquid according to claim 1 is characterized in that, described oleate is one or more in sodium oleate, fluorocarbon resin, the pure-acrylic emulsion.
6. room temperature blacking liquid according to claim 1 is characterized in that, described pH is 2.0～3.0th, is one or more solution adjustment in 25% citric acid, oxalic acid, the acetic acid with massfraction.
7. a preparation method who is applicable to the room temperature blacking liquid of ironcasting claimed in claim 1 is characterized in that, may further comprise the steps:
A, according to proportioning raw materials claimed in claim 1, with stirring in Sodium orthomolybdate and the copper sulfate adding part water it is dissolved fully first, add successively single nickel salt, complexing agent, film coalescence aid, additive and stirring again it is fully dissolved, it is for subsequent use to make blackening agent for surface A component;
B, polyoxyethylene glycol and oleate fully are dissolved in the part water, it is for subsequent use to make blackening agent for surface B component again;
C, will fill into remaining water after blackening agent for surface A component and the blackening agent for surface B component mixing and stirring, regulating the pH value with the pH adjusting agent again is 2.0～3.0, namely gets the room temperature blacking liquid that is applicable to ironcasting again.
8. the preparation method who is applicable to the room temperature blacking liquid of ironcasting according to claim 7 is characterized in that, the used part water of described step (a) is 1/2 of whole water.
9. the preparation method who is applicable to the room temperature blacking liquid of ironcasting according to claim 7 is characterized in that, the used part water of described step (b) is 1/3 of whole water.
10. the preparation method who is applicable to the room temperature blacking liquid of ironcasting according to claim 7, it is characterized in that, described complexing agent is Seignette salt, xitix, disodium ethylene diamine tetraacetate, Tripotassium Citrate sodium, in the sulphosalicylic acid one or more, described film coalescence aid is ammonium thiosulfate, ferrous sulfate, iron protochloride, in the inferior manganese of carbonic acid one or more, described additive is Sodium Silicofluoride, Starso, in the potassium silicofluoride one or more, described oleate is sodium oleate, fluorocarbon resin, in the pure-acrylic emulsion one or more, described pH adjusting agent are that massfraction is 25% citric acid, oxalic acid, one or more solution in the acetic acid are adjusted.
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| CN104233275A (en) * | 2014-09-23 | 2014-12-24 | 中山市华光化工有限公司 | High-temperature blackening agent suitable for stainless steel or alloy steel and using method of high-temperature blackening agent |
| CN104357818A (en) * | 2014-11-14 | 2015-02-18 | 无锡伊佩克科技有限公司 | Composition for steel phosphating and preparation method thereof |
| CN104630757A (en) * | 2013-11-11 | 2015-05-20 | 安徽未来表面技术有限公司 | Low temperature black phosphatization liquid with characteristics of high friction resistance and corrosion resistance |
| CN105925972A (en) * | 2016-07-01 | 2016-09-07 | 施和琴 | Pre-blackening treatment agent for metal surface |
| CN106011823A (en) * | 2016-07-29 | 2016-10-12 | 南京科润工业介质股份有限公司 | Surface treating agent for enhancing corrosion resistance of metals |
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| CN107354451A (en) * | 2017-06-28 | 2017-11-17 | 常州市顺旭商贸有限公司 | A kind of iron and steel casting room temperature blacking liquid and preparation method thereof |
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| CN107354451A (en) * | 2017-06-28 | 2017-11-17 | 常州市顺旭商贸有限公司 | A kind of iron and steel casting room temperature blacking liquid and preparation method thereof |
| CN112011790A (en) * | 2019-05-29 | 2020-12-01 | 北京铂阳顶荣光伏科技有限公司 | Stainless steel foil blackening liquid for photovoltaic and blackening treatment method of stainless steel foil |
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