GB594699A - Improvements in methods of producing surface conversion coatings on zinc - Google Patents
Improvements in methods of producing surface conversion coatings on zincInfo
- Publication number
- GB594699A GB594699A GB1657844A GB1657844A GB594699A GB 594699 A GB594699 A GB 594699A GB 1657844 A GB1657844 A GB 1657844A GB 1657844 A GB1657844 A GB 1657844A GB 594699 A GB594699 A GB 594699A
- Authority
- GB
- United Kingdom
- Prior art keywords
- radical
- sulphate
- zinc
- fluoride
- radicals
- 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.)
- Expired
Links
- HCHKCACWOHOZIP-UHFFFAOYSA-N zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title abstract 3
- 239000011701 zinc Substances 0.000 title abstract 3
- 229910052725 zinc Inorganic materials 0.000 title abstract 3
- 238000006243 chemical reaction Methods 0.000 title abstract 2
- 239000002253 acid Substances 0.000 abstract 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L Calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L Chromic acid Chemical compound O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 abstract 2
- UBXAKNTVXQMEAG-UHFFFAOYSA-L Strontium sulfate Chemical compound [Sr+2].[O-]S([O-])(=O)=O UBXAKNTVXQMEAG-UHFFFAOYSA-L 0.000 abstract 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract 2
- QYHFIVBSNOWOCQ-UHFFFAOYSA-L selenate Chemical compound [O-][Se]([O-])(=O)=O QYHFIVBSNOWOCQ-UHFFFAOYSA-L 0.000 abstract 2
- QAOWNCQODCNURD-UHFFFAOYSA-L sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 abstract 2
- TWGUZEUZLCYTCG-UHFFFAOYSA-N Sodium fluorosilicate Chemical compound [Na+].[Na+].F[Si-2](F)(F)(F)(F)F TWGUZEUZLCYTCG-UHFFFAOYSA-N 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 abstract 1
- 229910052783 alkali metal Inorganic materials 0.000 abstract 1
- 150000001340 alkali metals Chemical class 0.000 abstract 1
- 239000002585 base Substances 0.000 abstract 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 abstract 1
- 150000001844 chromium Chemical class 0.000 abstract 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract 1
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- 239000011651 chromium Substances 0.000 abstract 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 239000003086 colorant Substances 0.000 abstract 1
- 230000000875 corresponding Effects 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 239000011780 sodium chloride Substances 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 238000004381 surface treatment Methods 0.000 abstract 1
- 239000011787 zinc oxide Substances 0.000 abstract 1
- NDKWCCLKSWNDBG-UHFFFAOYSA-N zinc;dioxido(dioxo)chromium Chemical compound [Zn+2].[O-][Cr]([O-])(=O)=O NDKWCCLKSWNDBG-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/38—Chromatising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
594,699. Anodic surface treatment of zinc. STARECK, J. E., CORLISS, L. M., and UNITED CHROMIUM, Inc. Aug. 31, 1944, No. 16578. [Class 41] Surface conversion coatings are produced on zinc by anodic treatment, using current of 2-50 amps. per sq. ft. from an external source, in an aqueous bath containing a soluble chromate and an auxiliary acid radical selected from the group sulphate, selenate and fluoride (simple or complex) radicals, also having an alkali metal content to adjust the pH to 2-7. The proportion by weight of hexavalent chromium to sulphate radicals when employed is to lie within the range 10 : 1 and 30 : 1, the corresponding ranges in respect of the other auxiliary acid radicals being on the basis that 5 parts by weight of fluoride radical or 2 parts of silicofluoride radical or 1 part of selenate radial is equivalent to 1 parts of sulphate radical. The optimum proportion range with sulphate as the auxiliary radical is 15: 1 to 20: 1 with pH 3-4.5. The bath may be at room temperature. Chromic acid may be added from time to time to regulate the pH. The auxiliary acid radical may be introduced in the form of a sparingly soluble salt in excess, e.g. calcium or strontium sulphate or sodium silico-fluoride. An acetate or a chromium salt may be added as a buffer. A jet-black colour is obtained in baths of the sulphate radical type and yellow in baths of the fluoride type, similar colours being obtained on zinc-base diecastings of good quality. A steel cathode may be employed. The coating consists of zinc chromate with a small amount of zinc oxide.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB594699A true GB594699A (en) | 1947-11-18 |
Family
ID=1732406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1657844A Expired GB594699A (en) | 1944-08-31 | Improvements in methods of producing surface conversion coatings on zinc |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB594699A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0290793A2 (en) * | 1987-04-18 | 1988-11-17 | Henkel Kommanditgesellschaft auf Aktien | Process for the pretreatment of zinc-coated steel sheets |
-
1944
- 1944-08-31 GB GB1657844A patent/GB594699A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0290793A2 (en) * | 1987-04-18 | 1988-11-17 | Henkel Kommanditgesellschaft auf Aktien | Process for the pretreatment of zinc-coated steel sheets |
| EP0290793A3 (en) * | 1987-04-18 | 1990-02-07 | Henkel Kommanditgesellschaft auf Aktien | Process for the pretreatment of zinc-coated steel sheets |
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