GB599778A - Improvements relating to the production of phosphate coatings on metal - Google Patents
Improvements relating to the production of phosphate coatings on metalInfo
- Publication number
- GB599778A GB599778A GB2971145A GB2971145A GB599778A GB 599778 A GB599778 A GB 599778A GB 2971145 A GB2971145 A GB 2971145A GB 2971145 A GB2971145 A GB 2971145A GB 599778 A GB599778 A GB 599778A
- Authority
- GB
- United Kingdom
- Prior art keywords
- metal
- phosphate
- nitrate
- ammonium nitrate
- guanidine
- 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 a process for coating a metal or alloy surface with a phosphate, the surface is treated with a phosphate solution containing a heavy metal phosphate, i.e. a phosphate of a metal other than an alkaline or alkaline earth metal, with or without free phosphoric acid, in which the accelerator is ammonium nitrate which is reduced to an unstable nitrite. The ammonium nitrate may be replaced by a metal nitrate and an ammonium salt other than the nitrate or urea, hydrazine, guanidine, amino-guanidine sulphamic acid or a sulphamate or a mixture thereof. The solution may contain ferrous iron and the heavy metal may be iron, manganese, zinc or cadmium. The free acid should be maintained at a low value, e.g. by suspending scrap ferrous metal in the bath. The bath may be replenished by adding a concentrated chemical containing phosphoric acid and ammonium nitrate, or an equivalent mixture, in the required proportions. Specifications 386,739 and 514,443 are referred to.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB599778A true GB599778A (en) | 1948-03-19 |
Family
ID=1741727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2971145A Expired GB599778A (en) | 1945-11-07 | Improvements relating to the production of phosphate coatings on metal |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB599778A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3178319A (en) * | 1958-06-05 | 1965-04-13 | Geraldine D Henricks | Phosphate coating compositions and methods of making and using the same |
| EP0134895A1 (en) * | 1983-07-19 | 1985-03-27 | Gerhard Collardin GmbH | Process and compounds for applying accelerated and grain-refined phosphate coatings to metallic surfaces |
| CN112458444A (en) * | 2020-11-30 | 2021-03-09 | 李力 | Iron-based composite protective film without heavy metal and preparation method thereof |
-
1945
- 1945-11-07 GB GB2971145A patent/GB599778A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3178319A (en) * | 1958-06-05 | 1965-04-13 | Geraldine D Henricks | Phosphate coating compositions and methods of making and using the same |
| EP0134895A1 (en) * | 1983-07-19 | 1985-03-27 | Gerhard Collardin GmbH | Process and compounds for applying accelerated and grain-refined phosphate coatings to metallic surfaces |
| CN112458444A (en) * | 2020-11-30 | 2021-03-09 | 李力 | Iron-based composite protective film without heavy metal and preparation method thereof |
| CN112458444B (en) * | 2020-11-30 | 2022-11-29 | 李力 | Iron-based composite protective film without heavy metal and preparation method thereof |
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