CN109628919A - The preparation of surface of steel plate passivating film and drying process - Google Patents
The preparation of surface of steel plate passivating film and drying process Download PDFInfo
- Publication number
- CN109628919A CN109628919A CN201910089877.5A CN201910089877A CN109628919A CN 109628919 A CN109628919 A CN 109628919A CN 201910089877 A CN201910089877 A CN 201910089877A CN 109628919 A CN109628919 A CN 109628919A
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- China
- Prior art keywords
- galvanized steel
- plain sheet
- steel plain
- passivating solution
- preparation
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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
- C23C22/34—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 fluorides or complex fluorides
- C23C22/36—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 fluorides or complex fluorides containing also phosphates
- C23C22/368—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 fluorides or complex fluorides containing also phosphates containing magnesium cations
Abstract
This application discloses the preparation of surface of steel plate passivating film and drying process, include the following steps: S1: by zinc nitrate, calcium silicates, sodium fluoborate, citric acid, potassium permanganate, potassium dihydrogen phosphate, Stepanol MG, 60% sulfuric acid, 15% hydrochloric acid and deionized water are combined together into passivating solution；S2: being placed in 20min in passivating solution for galvanized steel plain sheet, and maintaining the temperature of passivating solution is 25 DEG C~35 DEG C；S3 takes out galvanized steel plain sheet from passivating solution, and toasts 10min in the environment of being placed in 200 DEG C；S4 baking is completed galvanized steel plain sheet being cooled to 30 DEG C with the speed of 2 DEG C/min, is down to 30 DEG C to temperature and elutes galvanized steel plain sheet with 10 DEG C of water；S5 dries up galvanized steel plain sheet with gas.The invention has the following beneficial effects: the passivation layer of consistent densification can be formed in galvanized steel sheet surface, and all do not need in whole process using chromium, more safety and environmental protection；Physics protective mulch and hydrophobic layer are formd on the surface of passivation layer simultaneously.
Description
Technical field
The present invention relates to the preparation of steel plate manufacturing field more particularly to a kind of surface of steel plate passivating film and drying process.
Background technique
Hot galvanizing is the commonly used protective cathodic protection mode of cold-rolled steel sheet, but zinc coat in air (especially wet
Profit air) in be easy to be corroded.In order to prevent the corrosion of zinc coat, need to be passivated processing, traditional passivation mode is to use
Cr VI passivator is coated on hot-galvanized steel plate surface, the passivation layer of one layer of chromic salts containing sexavalence is formed after dry, but Cr VI has
It is toxic and carcinogenic, human health is not only influenced, but also be easy to cause damages to environment.In order to reduce the harm of Cr VI, Bu Shaogang
Iron enterprise starts with trivalent chromium passivator, but trivalent chromium as passivator carry out using when can be changed into six under certain condition
Valence chromium equally exists the potential risk for endangering environment and human health.
Summary of the invention
The present invention is in view of the above-mentioned problems, propose preparation and the drying process of a kind of surface of steel plate passivating film.
The technical solution adopted by the present invention is as follows:
A kind of preparation of surface of steel plate passivating film and drying process, include the following steps:
S1: by zinc nitrate, calcium silicates, sodium fluoborate, citric acid, potassium permanganate, potassium dihydrogen phosphate, dodecyl sulphate
Magnesium, 60% sulfuric acid, 15% hydrochloric acid and deionized water are combined together into passivating solution；
S2: being placed in 20min in passivating solution for galvanized steel plain sheet, and maintaining the temperature of passivating solution is 25 DEG C~35 DEG C；
S3 takes out galvanized steel plain sheet from passivating solution, and toasts 10min in the environment of being placed in 200 DEG C；
S4 baking is completed galvanized steel plain sheet being cooled to 30 DEG C with the speed of 2 DEG C/min, is down to 30 DEG C with 10 DEG C to temperature
Water elutes galvanized steel plain sheet；
S5 dries up galvanized steel plain sheet with gas.
After above-mentioned processing, consistent fine and close passivation layer can be formed in galvanized steel sheet surface, and in whole process all
It does not need using chromium, more safety and environmental protection.
The effect difference of each component is as follows in passivating solution:
1: potassium permanganate and 60% effect of sulfuric acid have been oxidations, and zinc is oxidized to zinc oxide；
2: the effect of calcium silicates is attached to galvanized steel sheet surface, protects galvanized steel plain sheet in the form of physics covering；
3: sodium fluoborate oxidation retarder plays certain inhibiting effect to 60% sulfuric acid, prevents 60% sulfuric acid
Excessive oxidation zinc layers；
4: citric acid and 15% hydrochloric acid effect be inhibit 60% sulfuric acid ionize；
5, the effect of potassium dihydrogen phosphate be play the role of buffer with the hydrochloric acid collective effect of citric acid and 15%, thus
The pH of entire passivating solution is maintained to stablize；
6, Stepanol MG comes as anion active agent using Stepanol MG mainly improves permanganic acid
The activity of root enables MnO4 that zinc is oxidized to zinc oxide as far as possible under lower concentration；
7, the effect of zinc nitrate is that hydrogen ion in zinc and passivating solution is inhibited to react, because zinc nitrate is dissolved in water energy
A large amount of zinc ion enough is ionized out, and a large amount of existing zinc ions can print hydrogen ion and react with zinc simple substance in solution.
The effect of above-mentioned each material combinations together is to form one layer of fine and close zinc oxide in galvanized steel sheet surface, simultaneously
One layer of calcium silicates coating is further formed on zinc oxide film, calcium silicates coating plays the work of physical protection to zinc oxide film
With.
The galvanized steel plain sheet taken out in passivating solution is placed in the environment of 200 DEG C and toasts 10min, which is in order to zinc-plated
The passivation layer of surface of steel plate is even closer because during baking, the oxidant on the surface of galvanized steel plain sheet still with zinc
Reaction.
The effect of deionized water elution is the impurity in order to remove galvanized steel sheet surface.
Optionally, the galvanized steel plain sheet first uses dipping by lye before immersing passivating solution, and dipping by lye is after the completion again with dilute
Hydrochloric acid solution impregnates, and is finally eluted with deionized water.
Optionally, 6~8 parts of the zinc nitrate, 5~7 parts of calcium silicates, 0.5~1 part of sodium fluoborate, 1~2 part of citric acid, phosphorus
1~2 part of acid dihydride potassium, 1~2 part of Stepanol MG, 6~8 parts of 60% sulfuric acid, 6~8 parts of 15% hydrochloric acid, deionization
25 parts of water, 3~7 parts of potassium permanganate.
Optionally, the zinc nitrate, calcium silicates, sodium fluoborate, potassium dihydrogen phosphate are mixed evenly in deionized water,
Again by citric acid, 15% hydrochloric acid, 60% sulfuric acid is successively poured into the mixture of zinc nitrate and calcium silicates, is stirred into blunt
Change liquid.
Optionally, after galvanized steel plain sheet is placed in passivating solution, ultrasonication is imposed to steel plate and passivating solution.
First the effect of ultrasonication is to speed up passivation reaction, effect second be the passivation layer of galvanized steel sheet surface more
Add uniformity.
Optionally, nanoscale silica dioxide granule is added in the passivating solution；And the SiO 2 powder adds
Dosage is 2~3 parts.
Nanoscale silica dioxide granule is a kind of good hydrophobing agent, and silica dioxide granule is added in passivating solution, can
Good guarantor is played to passivation layer so that passivation layer is not easy by Acid rain damages to form one layer of hydrophobic layer in passivation layer surface
Shield effect.
Optionally, it after galvanized steel plain sheet is eluted by deionized water, is first blown with 10 DEG C~50 DEG C gases, then uses temperature 60 again
DEG C or more oxygen blow.
The beneficial effects of the present invention are: consistent fine and close passivation layer, and whole process can be formed in galvanized steel sheet surface
In all do not need using chromium, more safety and environmental protection；Physics protective mulch and hydrophobic layer are formd on the surface of passivation layer simultaneously.
Specific embodiment:
The present invention will be described in detail below.
It is each that steps are as follows
S1: galvanized steel plain sheet being placed in lye and impregnates 5min, is then placed in dilute hydrochloric acid again and is impregnated 5min, after the completion of immersion
10min is eluted with deionized water；
S2: by 8 parts of zinc nitrate, 5 parts of calcium silicates, 0.5 part of sodium fluoborate, 1 part of citric acid, 3 parts of potassium permanganate, biphosphate
1 part of potassium, 1 part of Stepanol MG, 6 parts of 60% sulfuric acid, 15% 6 parts of hydrochloric acid, is gone 2 parts of nanometer grade silica powder
25 parts of ionized water are combined together into passivating solution；
S2: being placed in 20min in passivating solution for galvanized steel plain sheet, and maintaining the temperature of passivating solution is 25 DEG C~35 DEG C, and again this
A process carries out ultrasonication to passivating solution and galvanized steel plain sheet；
S3 takes out galvanized steel plain sheet from passivating solution, and toasts 10min in the environment of being placed in 200 DEG C；
S4 baking is completed galvanized steel plain sheet being cooled to 30 DEG C with the speed of 2 DEG C/min, is down to 30 DEG C with 10 DEG C to temperature
Water elutes galvanized steel plain sheet；
S5 dries up galvanized steel plain sheet with gas.
The above description is only a preferred embodiment of the present invention, not thereby limits scope of patent protection of the invention, all
It is directly or indirectly to be used in other related technical areas with equivalent structure transformation made by present specification,
It similarly include within the scope of the present invention.
Claims (7)
1. preparation and the drying process of a kind of surface of steel plate passivating film, which comprises the steps of:
S1: by zinc nitrate, calcium silicates, sodium fluoborate, citric acid, potassium permanganate, potassium dihydrogen phosphate, Stepanol MG,
60% sulfuric acid, 15% hydrochloric acid and deionized water are combined together into passivating solution；
S2: being placed in 20min in passivating solution for galvanized steel plain sheet, and maintaining the temperature of passivating solution is 25 DEG C~35 DEG C；
S3 takes out galvanized steel plain sheet from passivating solution, and toasts 10min in the environment of being placed in 200 DEG C；
S4 baking is completed galvanized steel plain sheet being cooled to 30 DEG C with the speed of 2 DEG C/min, is down to 30 DEG C to temperature and is drenched with 10 DEG C of water
Wash galvanized steel plain sheet；
S5 dries up galvanized steel plain sheet with gas.
2. preparation and the drying process of surface of steel plate passivating film as described in claim 1, which is characterized in that the galvanized steel plain sheet
Dipping by lye is first used before immersing passivating solution, is impregnated again with dilute hydrochloric acid solution after the completion of dipping by lye, is finally used deionized water
Elution.
3. preparation and the drying process of surface of steel plate passivating film as described in claim 1, which is characterized in that the zinc nitrate 6
~8 parts, 5~7 parts of calcium silicates, 0.5~1 part of sodium fluoborate, 1~2 part of citric acid, 1~2 part of potassium dihydrogen phosphate, dodecyl sulphur
1~2 part of sour magnesium, 6~8 parts of 60% sulfuric acid, 6~8 parts of 15% hydrochloric acid, 25 parts of deionized water, 3~7 parts of potassium permanganate.
4. preparation and the drying process of surface of steel plate passivating film as claimed in claim 3, which is characterized in that the zinc nitrate,
Calcium silicates, sodium fluoborate, potassium permanganate, potassium dihydrogen phosphate are mixed evenly in deionized water, then by citric acid, 15%
Hydrochloric acid, 60% sulfuric acid successively pour into the mixture of zinc nitrate and calcium silicates, are stirred into passivating solution.
5. preparation and the drying process of surface of steel plate passivating film as described in claim 1, which is characterized in that when galvanized steel plain sheet is set
After in passivating solution, ultrasonication is imposed to galvanized steel plain sheet and passivating solution.
6. preparation and the drying process of surface of steel plate passivating film as described in claim 1, which is characterized in that in the passivating solution
Added with nanoscale silica dioxide granule；And the additive amount of the SiO 2 powder is 2~3 parts.
7. preparation and the drying process of surface of steel plate passivating film as described in claim 1, which is characterized in that when galvanized steel plain sheet quilt
After deionized water elution, is first blown with 10 DEG C~50 DEG C gases, then blown again with oxygen more than temperature 60 C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910089877.5A CN109628919A (en) | 2019-01-30 | 2019-01-30 | The preparation of surface of steel plate passivating film and drying process |
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| CN201910089877.5A CN109628919A (en) | 2019-01-30 | 2019-01-30 | The preparation of surface of steel plate passivating film and drying process |
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| CN109628919A true CN109628919A (en) | 2019-04-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112170143A (en) * | 2019-07-02 | 2021-01-05 | 深圳Tcl数字技术有限公司 | Metal back plate, display device and pre-coating method of metal back plate |
| CN114657493A (en) * | 2022-05-05 | 2022-06-24 | 河北华熙管业有限公司 | Corrosion-resistant galvanized steel pipe and production method thereof |
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| CN102586768A (en) * | 2011-01-10 | 2012-07-18 | 中国石油化工股份有限公司 | Zinc layer surface passivating treatment liquid |
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| CN107419248A (en) * | 2017-08-08 | 2017-12-01 | 合肥正明机械有限公司 | A kind of process of surface treatment of stamping parts of automobile |
| EP3305859A1 (en) * | 2016-10-07 | 2018-04-11 | Goodrich Corporation | Anti-corrosion and/or passivation compositions for metal-containing substrates and methods for making, enhancing, and applying the same |
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| CN101469421A (en) * | 2007-12-29 | 2009-07-01 | 比亚迪股份有限公司 | Film forming solution for magnesium alloy chemical composition coating and preparation thereof |
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| CN104342670A (en) * | 2013-07-23 | 2015-02-11 | 无锡市石塘湾工业园区开发建设有限公司 | Electrogalvanized surface passivation process for steel plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112170143A (en) * | 2019-07-02 | 2021-01-05 | 深圳Tcl数字技术有限公司 | Metal back plate, display device and pre-coating method of metal back plate |
| CN114657493A (en) * | 2022-05-05 | 2022-06-24 | 河北华熙管业有限公司 | Corrosion-resistant galvanized steel pipe and production method thereof |
| CN114657493B (en) * | 2022-05-05 | 2024-02-13 | 河北华熙管业有限公司 | Corrosion-resistant galvanized steel pipe and production method thereof |
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Application publication date: 20190416 |