DE1521889B1 - Verfahren zur phosphatierung von eisen und stahl - Google Patents
Verfahren zur phosphatierung von eisen und stahlInfo
- Publication number
- DE1521889B1 DE1521889B1 DE19661521889 DE1521889A DE1521889B1 DE 1521889 B1 DE1521889 B1 DE 1521889B1 DE 19661521889 DE19661521889 DE 19661521889 DE 1521889 A DE1521889 A DE 1521889A DE 1521889 B1 DE1521889 B1 DE 1521889B1
- Authority
- DE
- Germany
- Prior art keywords
- manganese
- phosphate
- phosphating
- alkaline
- solutions
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 8
- 229910052742 iron Inorganic materials 0.000 title claims description 4
- ZKCBQOQPFCSEFF-UHFFFAOYSA-H manganese(ii) phosphate Chemical compound [Mn+2].[Mn+2].[Mn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O ZKCBQOQPFCSEFF-UHFFFAOYSA-H 0.000 claims description 19
- CPSYWNLKRDURMG-UHFFFAOYSA-L hydron;manganese(2+);phosphate Chemical compound [Mn+2].OP([O-])([O-])=O CPSYWNLKRDURMG-UHFFFAOYSA-L 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 15
- 239000011572 manganese Substances 0.000 claims description 11
- 229910019142 PO4 Inorganic materials 0.000 claims description 10
- 235000021317 phosphate Nutrition 0.000 claims description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 8
- 239000010452 phosphate Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 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 4
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 238000010297 mechanical methods and process Methods 0.000 claims description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 2
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims 3
- 238000010306 acid treatment Methods 0.000 claims 2
- 239000007900 aqueous suspension Substances 0.000 claims 1
- 239000000834 fixative Substances 0.000 claims 1
- 230000005226 mechanical processes and functions Effects 0.000 claims 1
- 235000006408 oxalic acid Nutrition 0.000 claims 1
- JUWGUJSXVOBPHP-UHFFFAOYSA-B titanium(4+);tetraphosphate Chemical compound [Ti+4].[Ti+4].[Ti+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O JUWGUJSXVOBPHP-UHFFFAOYSA-B 0.000 claims 1
- 239000010410 layer Substances 0.000 description 14
- 238000007654 immersion Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 235000011180 diphosphates Nutrition 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 229910000158 manganese(II) phosphate Inorganic materials 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- JUNWLZAGQLJVLR-UHFFFAOYSA-J calcium diphosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])(=O)OP([O-])([O-])=O JUNWLZAGQLJVLR-UHFFFAOYSA-J 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 235000019821 dicalcium diphosphate Nutrition 0.000 description 4
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 description 4
- 238000007792 addition Methods 0.000 description 3
- 229940043256 calcium pyrophosphate Drugs 0.000 description 3
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 238000005169 Debye-Scherrer Methods 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- FATBEOOOVJZXRV-UHFFFAOYSA-K P(O)(O)(O)=O.P(=O)([O-])([O-])[O-].[Mn+3] Chemical class P(O)(O)(O)=O.P(=O)([O-])([O-])[O-].[Mn+3] FATBEOOOVJZXRV-UHFFFAOYSA-K 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- -1 alkali metal pyrophosphate Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229910000393 dicalcium diphosphate Inorganic materials 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 235000019820 disodium diphosphate Nutrition 0.000 description 1
- GYQBBRRVRKFJRG-UHFFFAOYSA-L disodium pyrophosphate Chemical compound [Na+].[Na+].OP([O-])(=O)OP(O)([O-])=O GYQBBRRVRKFJRG-UHFFFAOYSA-L 0.000 description 1
- 229940038485 disodium pyrophosphate Drugs 0.000 description 1
- YRIUSKIDOIARQF-UHFFFAOYSA-N dodecyl benzenesulfonate Chemical compound CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 YRIUSKIDOIARQF-UHFFFAOYSA-N 0.000 description 1
- 229940071161 dodecylbenzenesulfonate Drugs 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 229910000155 iron(II) phosphate Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- SDEKDNPYZOERBP-UHFFFAOYSA-H iron(ii) phosphate Chemical compound [Fe+2].[Fe+2].[Fe+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O SDEKDNPYZOERBP-UHFFFAOYSA-H 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 150000002696 manganese Chemical class 0.000 description 1
- BZDIAFGKSAYYFC-UHFFFAOYSA-N manganese;hydrate Chemical compound O.[Mn] BZDIAFGKSAYYFC-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 229910000406 trisodium phosphate Inorganic materials 0.000 description 1
- 235000019801 trisodium phosphate Nutrition 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US681022A US3510365A (en) | 1966-11-30 | 1967-11-06 | Process of pretreating ferrous metal surfaces before phosphatizing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM0071839 | 1966-11-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1521889B1 true DE1521889B1 (de) | 1972-01-13 |
Family
ID=7314162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19661521889 Pending DE1521889B1 (de) | 1966-11-30 | 1966-11-30 | Verfahren zur phosphatierung von eisen und stahl |
Country Status (13)
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0117599A1 (de) * | 1983-03-01 | 1984-09-05 | HILTI Aktiengesellschaft | Verfahren zur Aktivierung der Phosphatschichtausbildung auf Metallen und Mittel zur Durchführung solcher Verfahren |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2207047A1 (de) * | 1972-02-15 | 1973-08-30 | Metallgesellschaft Ag | Verfahren zur vorbereitung von stahlwerkstuecken fuer die spanlose kaltverformung |
BE789593A (fr) * | 1972-03-22 | 1973-02-01 | Parker Ste Continentale | Procede de phosphatation de l'acier |
US4381064A (en) | 1979-02-12 | 1983-04-26 | National Can Corporation | Coated sheet material and container therefrom |
US4285223A (en) * | 1979-02-12 | 1981-08-25 | Narayan Das | Phosphate and ester coating method |
FR2461020A1 (fr) * | 1979-07-06 | 1981-01-30 | Produits Ind Cie Fse | Perfectionnements apportes aux procedes de phosphatation au manganese des surfaces en fer et en acier |
ATE156199T1 (de) * | 1993-09-17 | 1997-08-15 | Brent Int Plc | Vorspülung für die phosphatierung von oberflächen aus metall |
JP3451334B2 (ja) * | 1997-03-07 | 2003-09-29 | 日本パーカライジング株式会社 | 金属のりん酸塩皮膜化成処理前の表面調整用前処理液及び表面調整方法 |
US6214132B1 (en) | 1997-03-07 | 2001-04-10 | Henkel Corporation | Conditioning metal surfaces prior to phosphate conversion coating |
JP3451337B2 (ja) * | 1998-07-21 | 2003-09-29 | 日本パーカライジング株式会社 | 金属のりん酸塩被膜化成処理前の表面調整用処理液及び表面調整方法 |
DE202006009625U1 (de) * | 2006-06-19 | 2007-10-31 | Paatz Viernau Gmbh | Verbindung zwischen zwei Körpern |
CN106495226A (zh) * | 2016-11-07 | 2017-03-15 | 江苏理工学院 | 一种八面体Mn3O4及其微波合成方法 |
JP2023532256A (ja) * | 2020-07-01 | 2023-07-27 | ケメタル ゲゼルシャフト ミット ベシュレンクテル ハフツング | リン酸マンガン処理プロセスのための改善された活性化剤 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB983925A (en) * | 1962-08-01 | 1965-02-24 | Pyrene Co Ltd | Improvements relating to the treatment of metal surfaces |
FR1409199A (fr) * | 1963-09-30 | 1965-08-20 | Yawata Iron & Steel Co | Procédé de pré-traitement pour le traitement de phosphatation des tôles d'acier et des tôles d'acier plaquées |
-
1966
- 1966-11-30 DE DE19661521889 patent/DE1521889B1/de active Pending
-
1967
- 1967-07-19 FR FR114768A patent/FR1531888A/fr not_active Expired
- 1967-08-10 BE BE702536D patent/BE702536A/xx not_active IP Right Cessation
- 1967-10-19 SE SE1432667A patent/SE339900B/xx unknown
- 1967-10-19 AT AT943667A patent/AT275263B/de active
- 1967-10-23 CH CH1486867A patent/CH488029A/de not_active IP Right Cessation
- 1967-10-26 DK DK534767A patent/DK133957B/da not_active IP Right Cessation
- 1967-10-27 DD DD12799667A patent/DD63687A5/de unknown
- 1967-10-31 IL IL2886167A patent/IL28861A/en unknown
- 1967-11-03 NO NO17038767A patent/NO118524B/no unknown
- 1967-11-24 NL NL6716053A patent/NL6716053A/xx not_active Application Discontinuation
- 1967-11-24 GB GB5362267A patent/GB1137449A/en not_active Expired
- 1967-11-27 ES ES347666A patent/ES347666A1/es not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB983925A (en) * | 1962-08-01 | 1965-02-24 | Pyrene Co Ltd | Improvements relating to the treatment of metal surfaces |
FR1409199A (fr) * | 1963-09-30 | 1965-08-20 | Yawata Iron & Steel Co | Procédé de pré-traitement pour le traitement de phosphatation des tôles d'acier et des tôles d'acier plaquées |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0117599A1 (de) * | 1983-03-01 | 1984-09-05 | HILTI Aktiengesellschaft | Verfahren zur Aktivierung der Phosphatschichtausbildung auf Metallen und Mittel zur Durchführung solcher Verfahren |
Also Published As
Publication number | Publication date |
---|---|
AT275263B (de) | 1969-10-27 |
GB1137449A (en) | 1968-12-18 |
NO118524B (enrdf_load_stackoverflow) | 1970-01-05 |
NL6716053A (enrdf_load_stackoverflow) | 1968-05-31 |
IL28861A (en) | 1971-02-25 |
FR1531888A (fr) | 1968-07-05 |
CH488029A (de) | 1970-03-31 |
BE702536A (enrdf_load_stackoverflow) | 1968-01-15 |
ES347666A1 (es) | 1969-06-01 |
SE339900B (enrdf_load_stackoverflow) | 1971-10-25 |
DD63687A5 (de) | 1968-09-05 |
DK133957B (da) | 1976-08-16 |
DK133957C (enrdf_load_stackoverflow) | 1977-01-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0064790A1 (de) | Verfahren zur Phosphatierung von Metallen sowie dessen Anwendung zur Vorbehandlung für die Elektrotauchlackierung | |
DE2247888C3 (de) | Mittel und Verfahren zum Reinigen und Aktivieren von Eisen- und/oder Zinkoberflächen und Konzentrate dieser Mittel | |
DE2049350A1 (de) | Phosphatierungslosungen und ihre Verwendung zum Korrosionsschutz von Eisen metall und Zinkoberflachen | |
DE1521889B1 (de) | Verfahren zur phosphatierung von eisen und stahl | |
EP0454211A1 (de) | Verfahren zum Aufbringen von Phosphatüberzügen auf MetalloberflÀ¤chen | |
DE3307158A1 (de) | Verfahren zur aktivierung der phosphatschichtausbildung auf metallen und mittel zur durchfuehrung solcher verfahren | |
DE4241134A1 (de) | Verfahren zur Phosphatierung von Metalloberflächen | |
EP0031103B1 (de) | Verfahren zur Vorbehandlung von Metalloberflächen vor dem Phosphatieren | |
DE718317C (de) | Verfahren zur Erzeugung korrosionsbestaendiger UEberzuege auf Metallen | |
EP0347663B1 (de) | Verfahren zum Verdichten von anodisierten Oxidschichten auf Aluminium und Aluminiumlegierungen | |
DE2538347B2 (de) | Zinkphosphatlösung zur Ausbildung von Zinkphosphatschichten auf Metallen | |
DE1546070B2 (de) | Verfahren zum Phosphatieren von Eisen- und Stahlgegenständen | |
DE2043085C3 (de) | Verfahren zum Aufbringen von Zinkphosphatschichten auf elektrolytisch verzinktes Material | |
DE1521889C (de) | Verfahren zur Phosphatierung von Eisen und Stahl | |
DE3217145A1 (de) | Verfahren zum reinigen, entfetten sowie aktivieren von metalloberflaechen | |
DE2422569A1 (de) | Verfahren zur erzeugung von ueberzuegen auf eisenoberflaechen | |
DE974503C (de) | Verfahren zur Herstellung von UEberzuegen auf Metallen | |
DE755756C (de) | Herstellung rostschuetzender UEberzuege | |
DE2103086C3 (de) | Verfahren zur Oberflächenbehandlung von Werkstücken aus Eisen und Stahl | |
DE1188898B (de) | Verfahren zur Phosphatierung von Eisen und Stahl | |
DE584411C (de) | Verfahren zur Herstellung von korrosionsfesten UEberzuegen auf Eisen und Stahl | |
DE973195C (de) | Verfahren zum UEberziehen von Metalloberflaechen mit einer Phosphatschicht | |
AT241933B (de) | Verfahren zur Phosphatierung von Eisen und Stahl | |
AT209662B (de) | Verfahren zur Spritzkaltreinigung von metallischen Oberflächen vor der Phosphatierung, Reinigungsmittel und Konzentrat zur Durchführung dieses Verfahrens | |
AT238529B (de) | Wässerige, nickelbeschleunigte Phosphatüberzugslösung |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
E77 | Valid patent as to the heymanns-index 1977 |