GB762104A - Corrosion protecting metal finishing composition - Google Patents
Corrosion protecting metal finishing compositionInfo
- Publication number
- GB762104A GB762104A GB26741/53A GB2674153A GB762104A GB 762104 A GB762104 A GB 762104A GB 26741/53 A GB26741/53 A GB 26741/53A GB 2674153 A GB2674153 A GB 2674153A GB 762104 A GB762104 A GB 762104A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sodium
- soluble
- solution
- sulphite
- sulphate
- 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
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
- C23C22/05—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
- C23C22/24—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 hexavalent chromium compounds
- C23C22/30—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 hexavalent chromium compounds containing also trivalent chromium
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)
- ing And Chemical Polishing (AREA)
Abstract
A dry composition capable of dissolving in an acid aqueous solution to produce a metal-finishing coating composition, comprises 90 parts by weight of a water soluble dichromate (calculated as Na2Cr2 O72H2O), 3-10 parts by weight of a non-hygroscopic, water-soluble, inorganic, metal sulphate (calculated as NA2SO4) and an amount of a water-soluble, non-hygroscopic, inorganic reducing agent, incapable of forming insoluble sulphates in acid solution, sufficient to reduce 0.5-5 per cent of the hexavalent chromium to trivalent chromium in acid solution. A lower aliphatic carboxylic acid salt soluble in aqueous acidic solution may also be present. The preferred components are sodium dichromate, sodium sulphate, sodium sulphite and sodium acetate. Other reducing agents include sodium hydrosulphite, potassium sulphite, thiosulphate and hydrosulphite, ammonium sulphite, thiosulphate and hydrosulphate and sodium peroxide; and instead of sodium acetate, sodium propionate or butyrate may be used. The composition may be dissolved in aqueous solutions of sulphuric, hydrochloric or nitric acids or mixtures thereof and may be used for the treatment of zinc, cadmium and zinc-copper alloy surfaces. Subsequently the surfaces may be treated with aqueous solutions of alkali metal hydroxides, carbonates or silicates; in particular with a solution of an alkali containing sodium, potassium, magnesium or ammonium sulphate with or without dextrose. Specifications 636,954, 680,435 and 762,103 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US762104XA | 1953-03-07 | 1953-03-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB762104A true GB762104A (en) | 1956-11-21 |
Family
ID=22130599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26741/53A Expired GB762104A (en) | 1953-03-07 | 1953-09-29 | Corrosion protecting metal finishing composition |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB762104A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1208149B (en) * | 1958-12-11 | 1965-12-30 | United States Steel Corp | Process for the aftertreatment of a protective film on tin-coated steel |
-
1953
- 1953-09-29 GB GB26741/53A patent/GB762104A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1208149B (en) * | 1958-12-11 | 1965-12-30 | United States Steel Corp | Process for the aftertreatment of a protective film on tin-coated steel |
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