CN1049253C - Nontoxic blackening liquid for iron and steel surface at normal temp. - Google Patents
Nontoxic blackening liquid for iron and steel surface at normal temp. Download PDFInfo
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- CN1049253C CN1049253C CN95111424A CN95111424A CN1049253C CN 1049253 C CN1049253 C CN 1049253C CN 95111424 A CN95111424 A CN 95111424A CN 95111424 A CN95111424 A CN 95111424A CN 1049253 C CN1049253 C CN 1049253C
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Abstract
The present invention discloses a nontoxic blackening liquid for iron and steel at normal temperature, which comprises CuSO4.5H2O with the concentration of 3 to 8 g/L, CrO3 with the concentration of 1.5 to 3.5 g/l, NH4Cl with the concentration of 4 to 9 g/l, sodium gluconate with the concentration of 3 to 8 g/L, polyethyleneglycol with the concentration of 2 to 5 ml/l and balance of acid enabling the pH value of the blackening liquid to be from 1.5 to 2.5. The nontoxic blackening liquid for iron and steel at normal temperature has the advantages of nontoxicity, no environmental pollution, good working condition, simple operation, high work efficiency, good film forming property, etc.
Description
The invention belongs to steel surface chemical oxidation blackout (indigo plant) processing technology field.
Existing steel surface blackening, the one, adopt the nitrite heating systems, in 135-142 ℃ of high-temperature concentrated alkali liquid, boil the blackout process of finishing in 30-60 minute, its energy consumption height, the production cycle is long, and labor condition is poor, and serious environment pollution; The 2nd, selenide room temperature blackening system, as application number 93119784.8 " rapid ordinary-temp blacking agent for steel ﹠ iron ", though do not heat, but the selenide that contains was both expensive, severe toxicity is arranged again, and life-time service certainly will cause environmental pollution, health risk, and technology instability, aftertreatment time are long, soak to need to hang behind the dehydrated oil and can put in storage more than 12 hours.
Purpose of the present invention just provides a kind of nontoxic, pollution-free, and labor condition is good, the work efficiency height, and the blackout time is short, aftertreatment is simple and direct, and film forming properties is good, and the nontoxic hair blackening liquid of iron and steel normal temperature with low cost.
For realizing above goal of the invention, the technical solution used in the present invention is: be solvent with water, moiety is: the CuSO of 3-8g/L
45H
2O, the CrO of 1.5-3.5g/L
3, the NH of 4-9g/L
4Cl, the Sunmorl N 60S of 3-8g/L, the polyoxyethylene glycol of 2-5ml/L molecular-weight average 400, content are that to make the solution pH value be the acid of 1.5-2.5, the trisodium EDTA of 0.2-0.5g/L, and the glucose of 5-8g/L is formed the nontoxic hair blackening liquid of iron and steel normal temperature.
The acid that hair blackening liquid of the present invention is regulated its pH value can be more than one mixture of a kind of in the acid such as sulfuric acid, boric acid, phosphoric acid, Glacial acetic acid, citric acid or its.
Said components by its proportioning weighing, is promptly made hair blackening liquid of the present invention after dissolving respectively, mix, stir, diluting.
The present invention is described in further detail below in conjunction with embodiment.
One embodiment of the invention are: the CuSO that gets 5g
45H
2The CrO of O, 2.2g
3, 6g NH
4Cl, the Sunmorl N 60S of 4.5g, the poly(oxyethylene glycol) 400 of 3ml (molecular-weight average is 400 polyethylene glycol reagents), the disodium ethylene diamine tetraacetate of 0.3g, the glucose of 7.5g, the sulfuric acid of 0.74g, the boric acid of 0.7g.After above-mentioned each component of being measured is dissolved in water respectively, remix, stir, be diluted to 1 liter solution, promptly make the nontoxic hair blackening liquid of iron and steel normal temperature of the present invention.It is that to make the hair blackening liquid pH value be more than one mixture of a kind of in the acid such as phosphoric acid, Glacial acetic acid, citric acid, sulfuric acid, boric acid of 1.5-2.5 or its that sulfuric acid wherein, boric acid also can be changed to content.
During use, will immerse in the hair blackening liquid of the present invention, and soak 1 minute to 1 minute half at normal temperatures and get final product through the iron and steel parts of oil removing, rinsing, activation pre-treatment.There is not the precipitation generation through observing solution.Compared in 3-5 minute with selenide blackout system soak time, the present invention improves work efficiency more than 3 times.
The steel part immersion dehydrated oil several seconds after the blackout can directly put in storage, and is simple and convenient.And the selenide blackening, the workpiece after the blackout needs suspension can put in storage more than 12 hours after soaking dehydrated oil, and is promptly time-consuming, accounts for the place again.
Its blackout mechanism of hair blackening liquid of the present invention is: the iron and steel parts after the activation treatment immerses in the hair blackening liquid, the iron of workpiece surface and CuSO
45H
2Replacement(metathesis)reaction takes place in O, forms copper at workpiece surface, simultaneously CrO
3Be strong oxidizer in acidic medium, with copper generation redox reaction, with copper be oxidized to black (indigo plant) look cupric oxide, be wrapped in the outside surface of workpiece, form the blackout rete.Acid in the hair blackening liquid (sulfuric acid, boric acid etc.) is for redox reaction provides required hydrogen ion, and the hair blackening liquid pH value is stabilized between the 1.5-2.5, makes the redox reaction velocity-stabilization, and good with the replacement(metathesis)reaction synchronism, and the bonding force of blackout rete is strong.Polyoxyethylene glycol in the hair blackening liquid is a tensio-active agent, makes workpiece surface wetting everywhere, fully contacts hair blackening liquid, and obtains even, fine and closely woven, bright blackout layer, and Sunmorl N 60S and disodium ethylene diamine tetraacetate are Cu
2+Ionic complexing agent, glucose then are Cu
2+Ionic reductive agent, its effect are the speed of regulating copper, iron replacement(metathesis)reaction, and ammonium chloride then is the catalyzer of redox reaction, and their acting in conjunction is to guarantee that the oxidizing reaction of replacement(metathesis)reaction and copper is synchronous, to obtain the strong cupric oxide rete of bonding force.
Do not produce toxic substance and precipitation in the nontoxic hair blackening liquid blackout of the metal normal temperature of the present invention process.Use the every liter of waste liquid in back to add and promptly reach discharging standards after 2g NaOH stirs, the waste liquid that perhaps will turn black just can reach discharging standards after adding 10 times of dilutions of water.
With hair blackening liquid of the present invention iron and steel parts is turned black and to handle the blackout rete excellent property that the back forms:
1, bottom (GB is 150 times) does not appear in friction more than 200 times to the blackout workpiece with clean calico.
2,2% copper sulfate point drops in blackout workpiece last 40 second of above nondiscoloration (GB is nondiscoloration in 20 seconds).
3, soaked 2 hours in 3% neutral NaCl watery solution, do not have muddy the appearance, meet national standard.
Compared with prior art, advantage of the present invention is:
1, no Toxic produces in nontoxic, the blackout process, and free from environmental pollution, working condition is improved greatly.
2, simple to operate, the work efficiency height, the blackout time is short, and post processing is simple and convenient, does not account for the place.
3, filming performance is good, and cost is low double, does not have expensive chemicals in the raw material.
Claims (2)
1, the nontoxic hair blackening liquid of a kind of iron and steel normal temperature is a solvent with water, and moiety is: the CuSO of 3-8g/L
45H
2O, the CrO of 1.5-3.5g/L
3, the NH of 4-9g/L
4Cl, the Sunmorl N 60S of 3-8g/L, the polyoxyethylene glycol of 2-5ml/L molecular-weight average 400, content are that to make the pH value of hair blackening liquid be the acid of 1.5-2.5, the disodium ethylene diamine tetraacetate of 0.2-0.5g/L, the glucose of 5-8g/L.
2, the nontoxic hair blackening liquid of iron and steel normal temperature according to claim 1 is characterized in that: described acid is one or more the mixture in sulfuric acid, boric acid, phosphoric acid, Glacial acetic acid, the citric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95111424A CN1049253C (en) | 1995-07-04 | 1995-07-04 | Nontoxic blackening liquid for iron and steel surface at normal temp. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95111424A CN1049253C (en) | 1995-07-04 | 1995-07-04 | Nontoxic blackening liquid for iron and steel surface at normal temp. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1139706A CN1139706A (en) | 1997-01-08 |
| CN1049253C true CN1049253C (en) | 2000-02-09 |
Family
ID=5078719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95111424A Expired - Fee Related CN1049253C (en) | 1995-07-04 | 1995-07-04 | Nontoxic blackening liquid for iron and steel surface at normal temp. |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1049253C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046038A (en) * | 2012-12-06 | 2013-04-17 | 安徽未来表面技术有限公司 | Room temperature blackening agent suitable for iron casting and method for preparing room temperature blackening agent suitable for iron casting |
| CN104451648B (en) * | 2014-12-26 | 2017-07-11 | 湖南金裕化工有限公司 | Steel normal temperature quick black liquid and preparation method thereof |
| CN109576696B (en) * | 2017-09-29 | 2021-02-26 | 蓝思科技（长沙）有限公司 | Blackening liquid medicine for metal grid, blackening method of blackening liquid medicine, metal grid and touch screen |
| CN110158069B (en) * | 2019-05-14 | 2021-04-13 | 浙江机电职业技术学院 | Normal-temperature quick-acting environment-friendly steel blackening agent and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87102868A (en) * | 1987-04-14 | 1988-11-02 | 高君奇 | Electric heating clothes |
| CN1085606A (en) * | 1993-11-10 | 1994-04-20 | 苏静康 | Rapid ordinary-temp blacking agent for steel ﹠ iron |
-
1995
- 1995-07-04 CN CN95111424A patent/CN1049253C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87102868A (en) * | 1987-04-14 | 1988-11-02 | 高君奇 | Electric heating clothes |
| CN1085606A (en) * | 1993-11-10 | 1994-04-20 | 苏静康 | Rapid ordinary-temp blacking agent for steel ﹠ iron |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1139706A (en) | 1997-01-08 |
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