GB477910A - Improvements in the production of phosphate coatings on ferrous surfaces - Google Patents
Improvements in the production of phosphate coatings on ferrous surfacesInfo
- Publication number
- GB477910A GB477910A GB1908336A GB1908336A GB477910A GB 477910 A GB477910 A GB 477910A GB 1908336 A GB1908336 A GB 1908336A GB 1908336 A GB1908336 A GB 1908336A GB 477910 A GB477910 A GB 477910A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ferrous
- oxidizing agent
- phosphate
- bath
- iron
- 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
- C23C22/07—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 phosphates
- C23C22/08—Orthophosphates
- C23C22/10—Orthophosphates containing oxidants
Abstract
In the phosphatizing of ferrous metal surfaces by subjecting them to a bath containing the phosphate of a metal above iron in the electrochemical series, the ferrous phosphate content of the bath is reduced by the periodic addition of an oxidizing agent capable of oxidizing ferrous iron to ferric iron under the conditions of the reaction. These additions are apart from and in addition to the usual replenishing. The amount of oxidizing agent added is preferably insufficient to oxidize all of the ferrous phosphate. When the bath contains manganese phosphate, e.g. a mixture of manganese and ferrous dihydrogen phosphates, the oxidizing agent is preferably potassium permanganate; when zinc dihydrogen phosphate is used, the oxidizing agent is preferably hydrogen peroxide. The bath may contain a weak oxidizing agent, e.g. sodium nitrate, to reduce or inhibit the formation of a hydrogen blanket on the work, as described in Specification 386,739*.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1908336A GB477910A (en) | 1936-07-09 | 1936-07-09 | Improvements in the production of phosphate coatings on ferrous surfaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1908336A GB477910A (en) | 1936-07-09 | 1936-07-09 | Improvements in the production of phosphate coatings on ferrous surfaces |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB477910A true GB477910A (en) | 1938-01-10 |
Family
ID=10123494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1908336A Expired GB477910A (en) | 1936-07-09 | 1936-07-09 | Improvements in the production of phosphate coatings on ferrous surfaces |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB477910A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1243494B (en) * | 1961-07-18 | 1967-06-29 | Amchem Prod | Process for the production of phosphate coatings on ferrous metal surfaces |
-
1936
- 1936-07-09 GB GB1908336A patent/GB477910A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1243494B (en) * | 1961-07-18 | 1967-06-29 | Amchem Prod | Process for the production of phosphate coatings on ferrous metal surfaces |
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