GB588437A - A method of improving the resistance to corrosion of stainless iron and steel - Google Patents
A method of improving the resistance to corrosion of stainless iron and steelInfo
- Publication number
- GB588437A GB588437A GB628444A GB628444A GB588437A GB 588437 A GB588437 A GB 588437A GB 628444 A GB628444 A GB 628444A GB 628444 A GB628444 A GB 628444A GB 588437 A GB588437 A GB 588437A
- Authority
- GB
- United Kingdom
- Prior art keywords
- metal
- immersed
- hour
- minutes
- corrosion
- 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
- C23C22/78—Pretreatment of the material to be coated
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)
- Chemical Treatment Of Metals (AREA)
Abstract
The resistance to corrosion of stainless irons and steels is increased by treating them with a corrosive fluid having a pH value of 2-7 for such a period that the dissolution of metal effected by the metal substantially ceases and then with a dissolved oxidising agent such as potassium bichromate or permanganate or hydrogen peroxide. The first liquid may be a hot acid containing an inhibitor in which the metal is immersed for at least 1/2 hour, preferably one hour. The metal is then immersed in the hot oxidising liquid for at least 15 minutes, preferably 30-45 minutes. In an example, the metal object is immersed for at least 1/2 hour in a boiling solution, prepared by dissolving 0.930 grams of citric acid and 1.986 gms. of sodium hydrogen phosphate in 1 litre of water, removed therefrom and then immersed in a boiling bichromate solution for at least 15 minutes. One alloy which is treated contains 14 per cent. of chromium, 1.07 of carbon, 0.5 of molybdenum, 0.5 of cobalt, 0.25 of copper, 0.3 of nickel, 0.45 of manganese, 0.35 of silicon and the balance iron. Specifications 383,567 and 471,070 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB628444A GB588437A (en) | 1944-04-04 | 1944-04-04 | A method of improving the resistance to corrosion of stainless iron and steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB628444A GB588437A (en) | 1944-04-04 | 1944-04-04 | A method of improving the resistance to corrosion of stainless iron and steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB588437A true GB588437A (en) | 1947-05-22 |
Family
ID=9811686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB628444A Expired GB588437A (en) | 1944-04-04 | 1944-04-04 | A method of improving the resistance to corrosion of stainless iron and steel |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB588437A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2657156A (en) * | 1948-07-23 | 1953-10-27 | Parker Rust Proof Co | Phosphate coating composition and process |
-
1944
- 1944-04-04 GB GB628444A patent/GB588437A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2657156A (en) * | 1948-07-23 | 1953-10-27 | Parker Rust Proof Co | Phosphate coating composition and process |
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