GB1023958A - Improvements in and relating to scale removal and ferrous metal passivation - Google Patents
Improvements in and relating to scale removal and ferrous metal passivationInfo
- Publication number
- GB1023958A GB1023958A GB2747163A GB2747163A GB1023958A GB 1023958 A GB1023958 A GB 1023958A GB 2747163 A GB2747163 A GB 2747163A GB 2747163 A GB2747163 A GB 2747163A GB 1023958 A GB1023958 A GB 1023958A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- solution
- ferrous metal
- hydroxyalkylamine
- edta
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
-
- 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
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
A process for removing iron oxides from, and passivating, ferrous metal e.g. steel surfaces, particularly in evaporators, boilers or heat exchangers, comprises contacting them with an aqueous alkaline solution, e.g. pH at least 8, prepared by mixing one or more of citric acid, nitrilotriacetic acid, N-2-hydroxyethylamino diacetic acid and alkylenepolyamine polycarboxylic acid, e.g. EDTA, N-2-hydroxyethyl EDTA, diethylenetriamine pentaacetic acid, propylene -1, 2 or 3-diamine tetraacetic acid or isomeric butylene-diamine tetraacetic acids, with water and adding sufficient ammonia, an amine and/or hydroxyalkylamine to render the solution alkaline. Preferably the amine or hydroxyalkylamine contains 1-5 carbon atoms per molecule, e.g. (di)methylamino-, (di)ethylamino-, methyl ethylamino-, propylamino-, trimethylamino-, butyl- or amylamino-, or the corresponding mono-, di-, tri-(alkano)amino-. The solution may be heated under pressure up to the decomposition temperature. Between 0.1% and 5% corrosion inhibitor may be added.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US21188562A | 1962-07-23 | 1962-07-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1023958A true GB1023958A (en) | 1966-03-30 |
Family
ID=22788687
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2747163A Expired GB1023958A (en) | 1962-07-23 | 1963-07-11 | Improvements in and relating to scale removal and ferrous metal passivation |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE635216A (en) |
DE (1) | DE1517406A1 (en) |
GB (1) | GB1023958A (en) |
NL (1) | NL295657A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4758415A (en) * | 1980-12-22 | 1988-07-19 | Basf Corporation | Process for removing soluble metal cations in iron oxide pigments |
WO1999061179A1 (en) * | 1998-05-22 | 1999-12-02 | Siemens Aktiengesellschaft | Method for cleaning a container |
EP0976853A1 (en) * | 1994-09-09 | 2000-02-02 | Mobil Oil Corporation | Method for removing alkaline earth metal sulfate scale from a boiler or heat exchanger with use of sonic energy |
CN111593355A (en) * | 2020-05-12 | 2020-08-28 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Method for cleaning boiler of thermal power plant |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2023397B3 (en) * | 1986-12-01 | 1992-01-16 | Siemens Ag | PROCEDURE FOR CLEANING A CONTAINER. |
DE4216383A1 (en) * | 1992-05-18 | 1993-11-25 | Siemens Ag | Process for cleaning a closed container |
CZ306082B6 (en) * | 2015-05-28 | 2016-07-27 | Ladislav Šťastný | Device for cleaning internal combustion engines |
-
0
- NL NL295657D patent/NL295657A/xx unknown
- BE BE635216D patent/BE635216A/xx unknown
-
1963
- 1963-07-11 GB GB2747163A patent/GB1023958A/en not_active Expired
- 1963-07-23 DE DE19631517406 patent/DE1517406A1/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4758415A (en) * | 1980-12-22 | 1988-07-19 | Basf Corporation | Process for removing soluble metal cations in iron oxide pigments |
EP0976853A1 (en) * | 1994-09-09 | 2000-02-02 | Mobil Oil Corporation | Method for removing alkaline earth metal sulfate scale from a boiler or heat exchanger with use of sonic energy |
WO1999061179A1 (en) * | 1998-05-22 | 1999-12-02 | Siemens Aktiengesellschaft | Method for cleaning a container |
GB2354773A (en) * | 1998-05-22 | 2001-04-04 | Siemens Ag | Method for cleaning a container |
AU757069B2 (en) * | 1998-05-22 | 2003-01-30 | Siemens Aktiengesellschaft | Method for cleaning a container |
GB2354773B (en) * | 1998-05-22 | 2003-04-30 | Siemens Ag | Method for cleaning a container |
US6695927B1 (en) * | 1998-05-22 | 2004-02-24 | Siemens Aktiengesellschaft | Method and cleaning solution for cleaning a container |
CN111593355A (en) * | 2020-05-12 | 2020-08-28 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Method for cleaning boiler of thermal power plant |
Also Published As
Publication number | Publication date |
---|---|
DE1517406A1 (en) | 1970-01-15 |
BE635216A (en) | |
NL295657A (en) |
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