GB551636A - Treatment of carbonised steel alloy surfaces to remove carbonaceous material therefrom - Google Patents
Treatment of carbonised steel alloy surfaces to remove carbonaceous material therefromInfo
- Publication number
- GB551636A GB551636A GB11040/41A GB1104041A GB551636A GB 551636 A GB551636 A GB 551636A GB 11040/41 A GB11040/41 A GB 11040/41A GB 1104041 A GB1104041 A GB 1104041A GB 551636 A GB551636 A GB 551636A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- treatment
- per cent
- hours
- carbonaceous material
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (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)
- Carbon And Carbon Compounds (AREA)
Abstract
551,636. Cleaning metal surfaces. BRITISH CELANESE, Ltd. Aug. 29, 1941, No. 11040. Convention date, Aug. 31,1940. [Class 82 (ii)] [Also in Group XXVIII] Carbonaceous material is removed from the carbonized surfaces of alloy steel articles such as tubes, reactors, and other articles by first treating with wet steam, then with an aqueous solution of a strongly oxidizing inorganic acid, e.g. nitric or chromic acids, and a hydrohalide acid, e.g., hydrofluoric acid, and then with a more concentrated solution of the strongly oxidizing acid. The first acid treatment may be effected with a solution. containing 6-12 per cent. of nitric acid and ¢-3 per cent. of hydrofluoric acid for about 2-6 hours and the second treatment with nitric acid 10-20 per cent, concentration for about 1-2 hours, both treatments being carried out at 70-90‹C. and the surfaces washed with water after each treatment. The initial treatment is effected with steam containing 5-20 per cent. of. moisture for 6-24 hours.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US551636XA | 1940-08-31 | 1940-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB551636A true GB551636A (en) | 1943-03-03 |
Family
ID=21996045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11040/41A Expired GB551636A (en) | 1940-08-31 | 1941-08-29 | Treatment of carbonised steel alloy surfaces to remove carbonaceous material therefrom |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB551636A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2137659A (en) * | 1983-04-08 | 1984-10-10 | Usui Kokusai Sangyo Kk | Joining cast iron member to another member of cast iron or other metal |
-
1941
- 1941-08-29 GB GB11040/41A patent/GB551636A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2137659A (en) * | 1983-04-08 | 1984-10-10 | Usui Kokusai Sangyo Kk | Joining cast iron member to another member of cast iron or other metal |
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