GB492521A - Improvements in or relating to the formation of protective layers on iron and steel articles - Google Patents
Improvements in or relating to the formation of protective layers on iron and steel articlesInfo
- Publication number
- GB492521A GB492521A GB482037A GB482037A GB492521A GB 492521 A GB492521 A GB 492521A GB 482037 A GB482037 A GB 482037A GB 482037 A GB482037 A GB 482037A GB 492521 A GB492521 A GB 492521A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hydrogen
- chromium
- mixture
- gas stream
- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
- C23C10/34—Embedding in a powder mixture, i.e. pack cementation
- C23C10/36—Embedding in a powder mixture, i.e. pack cementation only one element being diffused
- C23C10/38—Chromising
- C23C10/40—Chromising of ferrous surfaces
- C23C10/42—Chromising of ferrous surfaces in the presence of volatile transport additives, e.g. halogenated substances
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
A layer of chromium or chromium alloy is formed at the surface of an iron or steel article by treating it at a temperature of 900 DEG C. or over with a gaseous mixture formed by passing a continuous stream of hydrogen and hydrogen chloride over heated chromium or chromium alloy, e.g. ferrochrome. The gas stream preferably contains more hydrogen than hydrogen chloride and the reaction between the gas stream and the chromium &c. or between the resultant gas mixture and the article may take place in the presence of silicon or silicon compounds such as sand, quartz, or ferrosilicon. The chromium or chromium alloy and the articles may be in the same or in separate vessels; in the former case one or both may be enclosed in perforated containers. The vessels or containers may be rotated. The gas stream may be produced by passing hydrogen through fuming hydrochloric acid, and one or both of the constituents of the mixture or the mixture itself may be dried, e.g. by bubbling through concentrated sulphuric acid. The heated articles may be first treated with hydrogen alone to remove surface impurities such as oxides. The Provisional Specification refers also to the use of hydrochloric acid gas without hydrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB482037A GB492521A (en) | 1937-02-17 | 1937-02-17 | Improvements in or relating to the formation of protective layers on iron and steel articles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB482037A GB492521A (en) | 1937-02-17 | 1937-02-17 | Improvements in or relating to the formation of protective layers on iron and steel articles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB492521A true GB492521A (en) | 1938-09-19 |
Family
ID=9784416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB482037A Expired GB492521A (en) | 1937-02-17 | 1937-02-17 | Improvements in or relating to the formation of protective layers on iron and steel articles |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB492521A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2576916A1 (en) * | 1985-02-01 | 1986-08-08 | Centre Nat Rech Scient | Process for forming protective coatings on articles made of refractory alloys in a constantly renewed gas phase, under reduced pressure, and device for its implementation |
-
1937
- 1937-02-17 GB GB482037A patent/GB492521A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2576916A1 (en) * | 1985-02-01 | 1986-08-08 | Centre Nat Rech Scient | Process for forming protective coatings on articles made of refractory alloys in a constantly renewed gas phase, under reduced pressure, and device for its implementation |
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