GB1203980A - Improvements in or relating to the removal of scale from metal objects - Google Patents
Improvements in or relating to the removal of scale from metal objectsInfo
- Publication number
- GB1203980A GB1203980A GB55495/67A GB5549567A GB1203980A GB 1203980 A GB1203980 A GB 1203980A GB 55495/67 A GB55495/67 A GB 55495/67A GB 5549567 A GB5549567 A GB 5549567A GB 1203980 A GB1203980 A GB 1203980A
- Authority
- GB
- United Kingdom
- Prior art keywords
- melt
- alkaline solution
- anodic
- scale
- alkali metal
- 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
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
1,203,980. Electrolytic pickling. DYNAMIT NOBEL A. G. Dec. 6, 1967 [Dec.10, 1966], No.55495/67. Heading C7B. Scale is removed from a scaled metal object by pickling the object in an alkali metal hydroxide melt (e.g. NaOH and/or KOH) containing sodium hydride, and thereafter subjecting the pickled object to anodic and subsequent cathodic treatment in an aqueous alkaline solution or a melt containing at least 60% by weight, based on the alkaline solution or melt of an alkali metal hydroxide or mixture of alkali metal hydroxides (e.g. NaOH and or KOH) at a temperature which is greater than, but not more than 25 centigrade degrees greater than, the solidification point of the alkaline solution or melt, whereby the scale is completely or substantially completely removed. The "solidification point is the temperature at which, when the alkaline solution or melt is being cooled, solid material is first precipitated out. The anodic and cathodic treatments may employ currents of 1000 to 1500 amps for 5 to 20 minutes. After descaling, an object may be washed in cold water and dipped in an aqueous solution of calcium hydroxide. The Fig. illustrates descaling of a coil of wire 4, suspended from an electrode 3 of one polarity, and adjacent electrodes 5, 6 of opposite polarity. Half way through each of the anodic and cathodic treatments the coil of wire 4 is rotated so that a different portion is in contact with the part 3.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DED0051750 | 1966-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1203980A true GB1203980A (en) | 1970-09-03 |
Family
ID=7053629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB55495/67A Expired GB1203980A (en) | 1966-12-10 | 1967-12-06 | Improvements in or relating to the removal of scale from metal objects |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3616342A (en) |
| JP (1) | JPS5121938B1 (en) |
| BE (1) | BE707727A (en) |
| DE (1) | DE1496785A1 (en) |
| GB (1) | GB1203980A (en) |
| NL (1) | NL6716716A (en) |
| SE (1) | SE394896B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2714136A1 (en) * | 1976-04-01 | 1977-10-20 | Allegheny Ludlum Ind Inc | METAL BODY DESCALE METHOD |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5788672U (en) * | 1980-11-20 | 1982-06-01 | ||
| US6475289B2 (en) | 2000-12-19 | 2002-11-05 | Howmet Research Corporation | Cleaning of internal passages of airfoils |
| TR202100753A2 (en) * | 2021-01-19 | 2021-02-22 | Ahmet Ferhat Akguengoer | SYSTEM AND METHOD OF PROVIDING STEEL WIRE SURFACE CLEANING ON APPARATUS USED FOR EFFECTIVE CLEANING BEFORE STEEL WIRES AND GALVANIZED COATING |
-
1966
- 1966-12-10 DE DE19661496785 patent/DE1496785A1/en active Pending
-
1967
- 1967-12-06 GB GB55495/67A patent/GB1203980A/en not_active Expired
- 1967-12-08 BE BE707727D patent/BE707727A/xx unknown
- 1967-12-08 NL NL6716716A patent/NL6716716A/xx unknown
- 1967-12-08 SE SE6716918A patent/SE394896B/en unknown
- 1967-12-11 US US690717A patent/US3616342A/en not_active Expired - Lifetime
- 1967-12-11 JP JP42079453A patent/JPS5121938B1/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2714136A1 (en) * | 1976-04-01 | 1977-10-20 | Allegheny Ludlum Ind Inc | METAL BODY DESCALE METHOD |
Also Published As
| Publication number | Publication date |
|---|---|
| US3616342A (en) | 1971-10-26 |
| JPS5121938B1 (en) | 1976-07-06 |
| BE707727A (en) | 1968-04-16 |
| SE394896B (en) | 1977-07-18 |
| NL6716716A (en) | 1968-06-11 |
| DE1496785A1 (en) | 1969-08-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |