GB825485A - Improvements in the production of oxalate coatings - Google Patents
Improvements in the production of oxalate coatingsInfo
- Publication number
- GB825485A GB825485A GB10581/57A GB1058157A GB825485A GB 825485 A GB825485 A GB 825485A GB 10581/57 A GB10581/57 A GB 10581/57A GB 1058157 A GB1058157 A GB 1058157A GB 825485 A GB825485 A GB 825485A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nitrite
- solution
- oxalate
- oxalic acid
- sodium
- 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
- C23C22/46—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 oxalates
- C23C22/47—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 oxalates containing also phosphates
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)
Abstract
An aqueous solution for forming oxalate coatings on iron and steel surfaces contains 5-50 g/l oxalic acid, 0.2/4 g/l sodium nitrite or equivalent amounts of another nitrite, and one or more complex-forming phosphates, e.g. sodium pyrophosphate, polyphosphate or hexametaphosphate, preferably in an amount of at least one quarter of the weight of oxalic acid. The solution may be used in the dip and spray processes, and may be continuously replenished with nitrite and oxalic acid. Additions which may be made to the solution are (i) an iron compound such as ferrous sulphate which is oxidized by the nitrite to provide an initial ferric ion concentraton of 0.1-1 g/l (ii) an oxalate, e.g. ammonium or sodium oxalate, and (iii) a wetting agent (in the dip process). The coating is preferably rinsed with a solution of chromic acid which may contain phosphoric acid.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE825485X | 1956-03-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB825485A true GB825485A (en) | 1959-12-16 |
Family
ID=6747554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10581/57A Expired GB825485A (en) | 1956-03-31 | 1957-04-01 | Improvements in the production of oxalate coatings |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB825485A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0102284A1 (en) * | 1982-08-03 | 1984-03-07 | Roquette Frˬres | Composition and process for the chemical conversion of metallic substrates |
-
1957
- 1957-04-01 GB GB10581/57A patent/GB825485A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0102284A1 (en) * | 1982-08-03 | 1984-03-07 | Roquette Frˬres | Composition and process for the chemical conversion of metallic substrates |
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