CN1225950A - Production method of strong alkali-resistant film normal-temperature phosphating powder - Google Patents
Production method of strong alkali-resistant film normal-temperature phosphating powder Download PDFInfo
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- CN1225950A CN1225950A CN 98113429 CN98113429A CN1225950A CN 1225950 A CN1225950 A CN 1225950A CN 98113429 CN98113429 CN 98113429 CN 98113429 A CN98113429 A CN 98113429A CN 1225950 A CN1225950 A CN 1225950A
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- China
- Prior art keywords
- powder
- phosphate coat
- phosphatize phosphate
- phosphorizing
- acid
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- 239000000843 powder Substances 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title abstract description 6
- 239000003513 alkali Substances 0.000 title abstract description 5
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 11
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 229930040373 Paraformaldehyde Natural products 0.000 claims abstract description 5
- 229920002866 paraformaldehyde Polymers 0.000 claims abstract description 5
- 239000011775 sodium fluoride Substances 0.000 claims abstract description 5
- 235000013024 sodium fluoride Nutrition 0.000 claims abstract description 5
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims abstract description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 21
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 21
- 239000010452 phosphate Substances 0.000 claims description 21
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 5
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 5
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 4
- 238000004070 electrodeposition Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 230000003628 erosive effect Effects 0.000 claims 1
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 claims 1
- 230000004580 weight loss Effects 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 8
- 229910052742 iron Inorganic materials 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 238000010422 painting Methods 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 238000005507 spraying Methods 0.000 abstract description 2
- 238000007590 electrostatic spraying Methods 0.000 abstract 1
- 150000002828 nitro derivatives Chemical class 0.000 abstract 1
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 238000004381 surface treatment Methods 0.000 abstract 1
- MFXMOUUKFMDYLM-UHFFFAOYSA-L zinc;dihydrogen phosphate Chemical compound [Zn+2].OP(O)([O-])=O.OP(O)([O-])=O MFXMOUUKFMDYLM-UHFFFAOYSA-L 0.000 abstract 1
- 239000011701 zinc Substances 0.000 description 17
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 12
- 229910052725 zinc Inorganic materials 0.000 description 12
- 238000000034 method Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000001962 electrophoresis Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- OSKILZSXDKESQH-UHFFFAOYSA-K zinc;iron(2+);phosphate Chemical compound [Fe+2].[Zn+2].[O-]P([O-])([O-])=O OSKILZSXDKESQH-UHFFFAOYSA-K 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Chemical Treatment Of Metals (AREA)
Abstract
The present invention relates to a production technology of normal-temp. phosphatizing powder for surface treatment before painting steel and iron. The phosphorization powder consists of solidified acid, zinc dihydrogen phosphate, sodium fluoride, paraformaldehyde or a substance which is decomposed in acid to generate formaldehyde, organic nitro compound and citric acid. The phosphorizing liquid prepared by the phosphorizing powder is soaked in steel for 3-5 minutes at the liquid temperature of 10-35 ℃ to generate a strong alkali-resistant gray phosphorizing film, and the phosphorizing liquid is particularly suitable for cathode electrophoretic coating besides general mechanical spraying and electrostatic spraying. The production method of the phosphorization powder is simple, convenient for packaging, storage and transportation and low in production cost.
Description
The invention belongs to iron and steel lacquer front surface and handle the phosphatizing powder production technology of usefulness.
Along with countries in the world automotive industry technology rapid development and progress, the requirement of car surface application is more and more higher.Phosphatization then is the indispensable pre-treatment step of application.In recent years, painting dressing automobiles is brought into use the cathode electrodip painting of high thickness, and this lacquer requires more Gao Gengyan to the phosphatize phosphate coat as paint filler.The phosphatize phosphate coat that is used for cathode electro-coating must have alkali-resistivity preferably, when the phosphatization workpiece carries out ability cathode electrophoresis, because cathode hydrogen evolution makes OH
-Ionic concn increases, and the solution alkalescence of cathode interface strengthens, and pH value raises.Common high zinc (Zn in the phosphatization liquid
2+Concentration is greater than 1.5 grams per liters) alkali-resistivity of phosphatize phosphate coat is poor, and phosphatize phosphate coat dissolves more in strong alkali solution." the matching capacity research that phosphatize phosphate coat and ability cathode electrophoresis are filmed " (seeing " modern coating and application " 1996.3.19) literary composition report, common high zinc phosphatize phosphate coat is at 30 ℃, soaked 3 minutes in the sodium hydroxide solution of PH=13, phosphatize phosphate coat dissolving weightlessness reaches 30-40%, causes the bonding force of enamelled coating and iron and steel to reduce greatly.And low zinc (Zn in the phosphatization liquid
2+Concentration is less than 1.5 grams per liters, and phosphatize phosphate coat dissolving weightlessness is lower than 6.6%, and less to the bonding force influence of enamelled coating and iron and steel, low zinc phosphating process technology is because of zinc iron phosphate [Zn in its rete component
2Fe (PO
4)
24H
2O, this salt is insoluble in alkali] ratio accounts for the overwhelming majority, and [its film composition mainly is zinc phosphate Zn to make its alkali-resistivity be far superior to common high zinc phosphatize phosphate coat
3(PO
4)
24H
2O, this salt alkali resistant dissolubility is poor].At present, developed countries such as Europe, the U.S., Japan all have been extensive use of full immersed type low zinc phosphating process technology in painting dressing automobiles, the domestic exploitation low zinc phosphating process technology that begun one's study, but, this low zinc phosphating process technology has three shortcomings: the one, and use expensive nickel salt to do promotor, make the more common high zinc phosphatization height of cost; The 2nd, use the Sodium Nitrite that very easily decomposes the generation toxic gas to do promotor, phosphorization film quality is difficult to control, and the phosphatization working fluid needs frequent analytical test, tank liquor maintenance management difficulty; The 3rd, phosphatization temperature will be controlled at about 50 ℃, and energy consumption is big.
The phosphorization agent that uses both at home and abroad mostly is liquid at present, is not easy to pack accumulating.
The objective of the invention is to overcome the above-mentioned shortcoming of common high zinc phosphatize phosphate coat alkali-resistivity difference and low zinc phosphating process technology, simultaneously phosphatization liquid is made pulvis so that the packing accumulating.Implementation method of the present invention is: will solidify acid, primary zinc phosphate, Sodium Fluoride, Paraformaldehyde 96 or decompose industrial chemicals commonly used such as the material that produces formaldehyde, organic nitro thing, citric acid in acid and mix in proportion, and promptly get strong alkali-resistivity film normal temperature phosphating powder.
Retrieve " the Chinese patent index " in year December in January, 1986 to 1997, " the Chinese chemical digest " in year December in January, 1986 to 1997, and U.S.'s " chemical abstracts " (Chemical Abstracts) in year December in January, 1980 to 1997 does not all have the report of this type of strong alkali-resistivity film normal temperature phosphating powder.
The mass percent of each component is in this phosphatizing powder:
Solidify sour 10-20
Primary zinc phosphate 50-70
Sodium Fluoride 3-5
Divide in Paraformaldehyde 96 or the acid
Separate the material 1-5 that produces formaldehyde
Organic nitro thing 1-5
Citric acid 1-4
Phosphatizing powder 50 to 70 grams are dissolved in 20-30 ℃ of 1 liter of tap water, stir and make it dissolving, the phosphatization working fluid of preparation is handled iron and steel parts (soaked 3-5 minute, sprayed 1-2 minute) at 10-35 ℃, can get strong alkali-resistivity grey phosphatize phosphate coat, the heavy 2-4.5 gram/m of film
2, thickness 2-3 μ m.Phosphatize phosphate coat soaked 3 minutes in the strong basicity sodium hydroxide solution of PH=13 at 31 ℃, and the phosphatize phosphate coat dissolving is weightless less than 2.4%, and [its rete composition mainly is tertiary iron phosphate zinc Zn to the alkali-resistivity of this phosphatize phosphate coat
2Fe (PO
4)
24H
2O] better than low zinc phosphating process film, be applicable to cathode electro-coating.
Pei Zhi phosphatization liquid as stated above, pH value is 3, free acidity 7-8 point, total acidity 50-60 point, the phosphatization fluidity can be stablized, and the groove slag is few, tank liquor is easy to maintenance management, does not need frequent analytical test in the parkerizing process, and no toxic gas produces, the phosphatize phosphate coat corrosion resistance is good, according to standard GB 6807-86, the acid copper sulfate pittingtest, 60-120 does not corrode second, 3% sodium chloride solution corrosion test, 5 hours rustless.Indoor aerial lacing film (relative humidity 85%) 2-4 week is rustless behind the phosphatization workpiece washing and drying.
Embodiment one:
Phosphatizing powder prescription (mass percent)
Solidify acid 15
Primary zinc phosphate 70
Sodium Fluoride 5
Paraformaldehyde 96 5
Organic nitro thing 3
Citric acid 2
These phosphatizing powder 70 grams are dissolved in 20-30 ℃ of 1 liter of tap water, stirring and dissolving, can deposit under the 10-35 ℃ of liquid temperature condition and use, the iron and steel parts that eliminates the oil rust is soaked 3-5 minute (or spraying 1-2 minute) in phosphatization liquid, can form fine and close strong alkali-resistivity grey phosphatize phosphate coat.
Claims (3)
1, a kind of strong alkali-resistivity film normal temperature phosphating powder is characterized in that: the mass percent of each component is in its prescription: solidify sour 10-20, primary zinc phosphate 50-70, Sodium Fluoride 3-5, Paraformaldehyde 96 or in acid, decompose to produce the material 1-5 of formaldehyde, organic nitro thing 1-5, citric acid 14.
2, the described normal temperature phosphating powder of claim 1, the phosphatize phosphate coat alkali-resistivity that it is characterized in that handling with the phosphatization liquid of this phosphatizing powder preparation the steel surface gained is strong, this phosphatize phosphate coat is at 31 ℃, soaked 3 minutes in the sodium hydroxide solution of PH=13, phosphatize phosphate coat dissolving rate of weight loss is lower than 2.4%, and this phosphatize phosphate coat is specially adapted to cathode electro-coating.
3, the molybdate that adds 1-5% in phosphatizing powder can strengthen the erosion resistance of phosphatize phosphate coat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98113429 CN1225950A (en) | 1998-02-13 | 1998-02-13 | Production method of strong alkali-resistant film normal-temperature phosphating powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98113429 CN1225950A (en) | 1998-02-13 | 1998-02-13 | Production method of strong alkali-resistant film normal-temperature phosphating powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1225950A true CN1225950A (en) | 1999-08-18 |
Family
ID=5223156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98113429 Pending CN1225950A (en) | 1998-02-13 | 1998-02-13 | Production method of strong alkali-resistant film normal-temperature phosphating powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1225950A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323911C (en) * | 2003-06-13 | 2007-07-04 | 中国科学院金属研究所 | Processing method for high purity and corrosive gas packaging container |
| CN103484847A (en) * | 2013-10-18 | 2014-01-01 | 国家电网公司 | Phosphating solution and phosphating method |
-
1998
- 1998-02-13 CN CN 98113429 patent/CN1225950A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323911C (en) * | 2003-06-13 | 2007-07-04 | 中国科学院金属研究所 | Processing method for high purity and corrosive gas packaging container |
| CN103484847A (en) * | 2013-10-18 | 2014-01-01 | 国家电网公司 | Phosphating solution and phosphating method |
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