US1719168A - Pickling of metals, etc. - Google Patents
Pickling of metals, etc. Download PDFInfo
- Publication number
- US1719168A US1719168A US160527A US16052727A US1719168A US 1719168 A US1719168 A US 1719168A US 160527 A US160527 A US 160527A US 16052727 A US16052727 A US 16052727A US 1719168 A US1719168 A US 1719168A
- Authority
- US
- United States
- Prior art keywords
- acid
- pickling
- bath
- cleaning
- hexamethylenetetramine
- 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 - Lifetime
Links
- 238000005554 pickling Methods 0.000 title description 32
- 239000002184 metal Substances 0.000 title description 23
- 229910052751 metal Inorganic materials 0.000 title description 23
- 150000002739 metals Chemical class 0.000 title description 9
- 239000002253 acid Substances 0.000 description 38
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 28
- 238000004140 cleaning Methods 0.000 description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 16
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 14
- 239000004312 hexamethylene tetramine Substances 0.000 description 14
- 230000009471 action Effects 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 229940032330 sulfuric acid Drugs 0.000 description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- 230000002452 interceptive effect Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000003517 fume Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003112 inhibitor Substances 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 108010080511 serum sodium transport inhibitor Proteins 0.000 description 1
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
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/061—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors nitrogen-containing compounds
Definitions
- This invention relates to the pickling and cleaning of metals, and particularly to the pickling of iron and steel, to remove scale therefrom, although the invention is of more or less general application to the cleaning and pickling of metals such as iron and steel for the removal of oxides or scale therefrom.
- the pickling or cleaning of iron or steel is commonly efi'eeted by means of acid pickling or cleaning baths which remove the scale or oxide from the metal.
- the picklingbaths commonly employed are acid baths which often attack the metal as well as the scale. This action on the metal is undesirable and objectionable, involving not only excessive consumption of acids, but also corrosion or dissolving of metal and tending to give a rough or pitted surface.
- the present invention provides an improved bath for cleaning or pickling metals and also an improved process of pickling or cleaning the metal in which the acid pickling bath has incorporated therein a small amount of hexamethylenetetramine.
- the acid pickling baths with which hexamethylenetetramine is used may be acid baths suchas are commonly employed for pickling or cleaning iron and steel, containing, for example, about ten percent of sulfuric-acid. Such baths are gradually impoverished by the action of the acid in removing the scale or rust and their content of ferrous sulfate increases until the bath becomes too weak or too concentrated in ferrous sulfate for further use.
- sulfuric acid baths other acid baths can be used, including acid sulfate baths.
- the amount of hexamethylenetetramine added to the bath for carrying out the pickling or cleaning operation can be varied.
- hexamethylenetetramine In general, only a small amount of hexamethylenetetramine is required, for example, a small fraction of one percent. From two to five pounds f hexamcthylenetetramine for each ton of 66 degree acid used in the pickling bath has been found to give satisfactory results.
- the carrying out of the pickling or cleaning operation may be the same as in ordiby reducing the formation Application filed January 11, '1927. Serial No. 160,527.
- the pickling can be carried out continuously by passing the material to be pickled, such as wire or sheets, through a number of baths in a regulated manner; or b immersing the article to be pickled in the pickling bath for a suitable period of time.
- the temperature of the bath can be varied, ordinarily being around 150 to 180 F.
- the pickling bath may be replenishcd by the addition of further amounts of acid until the iron sulfate reaches too great a concentration.
- the addition of the 'hexamethylenetetramine to the bath prevents or retards or inhibits the act-ion of the acid bath on the metal without interfering with the removal of scale or oxide.
- the formation of hydrogen by the action of the acid bath on the metal is also reduced and the evolution of acid mist or fumes also greatly reduced.
- the reduced amount of action of the acid on themetal and the reduction in amount of hydrogen produced correspondingly reduces the amount of hydrogen absorbed by the metal.
- the method of cleaning or pickling metals which comprises subjecting the same to a non-oxidizing mineral acid pickling or cleaning bath and inhibiting the chemical action of the acid on the metal without interfering with the removal of scale or oxide, and thereof hydrogen and the production of acid fumes and effecting an economy in the acid consumed, by incorporating in the acid bath a small amount of hexamethylenetetramine.
- the method of pickling or cleaning iron or steel which comprises subjecting the same to a sulfuric acid pickling bath and inhibiting the chemical action of the acid on the metal without interfering with the removal of scale or oxide, and thereby reducing the formation of hydrogen and the production of acid fumes and efl'ecting an economy in the acid cou sumed, by incorporating in the acid bath a small-fraction of one percent of hexamethylenetetramine.
- the method of picklin or cleaning iron or steel which comprises su jectingthe same at atemperature of between 150180 F. to a sulfuric acid pickling bath and inhibiting the chemical action of the acid on the metal without interfering with the removal of scale or oxide, and thereby reducing the formation of hydrogen and the production of acid fumes and ,efiecting an economy in the acid consumed, by incorporating in the acid bath a small fraction of one percent of hexamethylenetetramine.
- the method of cleaning or pickling metals which comprises subjecting the same to a sulfuric acid pickling or cleaning bath and inhibitin the chemical action of the acid on the meta without interfering with the removal of scale or oxide, and thereby reducing the formation of hydrogen and the production of acid fumes and effecting an economy in the acid consumed, by incorporating in the acid bath hexamethylenetetramine in the proportion of from two to five pounds of hexamethylenetetramine to each ton of 60 degree Baum sulfuric acid. 7 l
- a non-oxidizing mineral acid bath for cleaning or pickling metals which contains a small amount of hexamethylenetetramine as an inhibitor.
- a non-oxidizing mineral acid bath for cleaning or pickling iron or steel which contains a fraction of one percent of hexamethylcnetetramine as an inhibitor.
- a bath for cleaning or pickling metals which contains sulfuric acid and a small amount of hcxamethylenetetramine as an inhibitorzr 8.
- a bath for pickling or cleaning iron or steel which contains sulfuric acid and a small fraction of one percent of hexamethylenetetramine as an inhibitor.
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)
Description
.1 Patented July 2, 1929 UNITED STATES 1,719,168 PATENT OFFICE.
YORK.
KENTUCKY, ASSIGNOR TO R. T. VANDER- Y A CORPORATION OF NEW PICKLING OF METALS, ETC.
No Drawing.
This invention relates to the pickling and cleaning of metals, and particularly to the pickling of iron and steel, to remove scale therefrom, although the invention is of more or less general application to the cleaning and pickling of metals such as iron and steel for the removal of oxides or scale therefrom.
The pickling or cleaning of iron or steel is commonly efi'eeted by means of acid pickling or cleaning baths which remove the scale or oxide from the metal. The picklingbaths commonly employed are acid baths which often attack the metal as well as the scale. This action on the metal is undesirable and objectionable, involving not only excessive consumption of acids, but also corrosion or dissolving of metal and tending to give a rough or pitted surface. i
The present invention provides an improved bath for cleaning or pickling metals and also an improved process of pickling or cleaning the metal in which the acid pickling bath has incorporated therein a small amount of hexamethylenetetramine.
I have found that the addition of a small amount of hexamethylenetetramine prevents or retards or inhibits the attack of the acid pickling bath on the metal without interfering with the removal of scale or oxide by the acid bath.
The acid pickling baths with which hexamethylenetetramine is used may be acid baths suchas are commonly employed for pickling or cleaning iron and steel, containing, for example, about ten percent of sulfuric-acid. Such baths are gradually impoverished by the action of the acid in removing the scale or rust and their content of ferrous sulfate increases until the bath becomes too weak or too concentrated in ferrous sulfate for further use. Instead of using sulfuric acid baths, other acid baths can be used, including acid sulfate baths. The amount of hexamethylenetetramine added to the bath for carrying out the pickling or cleaning operation can be varied. In general, only a small amount of hexamethylenetetramine is required, for example, a small fraction of one percent. From two to five pounds f hexamcthylenetetramine for each ton of 66 degree acid used in the pickling bath has been found to give satisfactory results.
The carrying out of the pickling or cleaning operation may be the same as in ordiby reducing the formation Application filed January 11, '1927. Serial No. 160,527.
nary practice. For example, the pickling can be carried out continuously by passing the material to be pickled, such as wire or sheets, through a number of baths in a regulated manner; or b immersing the article to be pickled in the pickling bath for a suitable period of time. The temperature of the bath can be varied, ordinarily being around 150 to 180 F. The pickling bath may be replenishcd by the addition of further amounts of acid until the iron sulfate reaches too great a concentration.
The addition of the 'hexamethylenetetramine to the bath prevents or retards or inhibits the act-ion of the acid bath on the metal without interfering with the removal of scale or oxide. The formation of hydrogen by the action of the acid bath on the metal is also reduced and the evolution of acid mist or fumes also greatly reduced. There is also a saving in the acid as well as a protection of the metal. The reduced amount of action of the acid on themetal and the reduction in amount of hydrogen produced correspondingly reduces the amount of hydrogen absorbed by the metal.
The employment of the hexamethylenetetramine in the pickling or cleaning operation, according to the present invention, involves but small additional expense and results in advantages in operation, economy of acid, protection of the metal from attack, etc., which materially improve the pickling and cleaning operation.
I claim: v
1. The method of cleaning or pickling metals which comprises subjecting the same to a non-oxidizing mineral acid pickling or cleaning bath and inhibiting the chemical action of the acid on the metal without interfering with the removal of scale or oxide, and thereof hydrogen and the production of acid fumes and effecting an economy in the acid consumed, by incorporating in the acid bath a small amount of hexamethylenetetramine.
2. The method of pickling or cleaning iron or steel which comprises subjecting the same to a sulfuric acid pickling bath and inhibiting the chemical action of the acid on the metal without interfering with the removal of scale or oxide, and thereby reducing the formation of hydrogen and the production of acid fumes and efl'ecting an economy in the acid cou sumed, by incorporating in the acid bath a small-fraction of one percent of hexamethylenetetramine.
3. The method of picklin or cleaning iron or steel which comprises su jectingthe same at atemperature of between 150180 F. to a sulfuric acid pickling bath and inhibiting the chemical action of the acid on the metal without interfering with the removal of scale or oxide, and thereby reducing the formation of hydrogen and the production of acid fumes and ,efiecting an economy in the acid consumed, by incorporating in the acid bath a small fraction of one percent of hexamethylenetetramine.
4. The method of cleaning or pickling metals which comprises subjecting the same to a sulfuric acid pickling or cleaning bath and inhibitin the chemical action of the acid on the meta without interfering with the removal of scale or oxide, and thereby reducing the formation of hydrogen and the production of acid fumes and effecting an economy in the acid consumed, by incorporating in the acid bath hexamethylenetetramine in the proportion of from two to five pounds of hexamethylenetetramine to each ton of 60 degree Baum sulfuric acid. 7 l
5. A non-oxidizing mineral acid bath for cleaning or pickling metals which contains a small amount of hexamethylenetetramine as an inhibitor.
6. A non-oxidizing mineral acid bath for cleaning or pickling iron or steel which contains a fraction of one percent of hexamethylcnetetramine as an inhibitor.
7. A bath for cleaning or pickling metals which contains sulfuric acid and a small amount of hcxamethylenetetramine as an inhibitorzr 8. A bath for pickling or cleaning iron or steel which contains sulfuric acid and a small fraction of one percent of hexamethylenetetramine as an inhibitor.
In testimony whereof I aifix my signature.
GEORGE D. CHAMBERLAIN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US160527A US1719168A (en) | 1927-01-11 | 1927-01-11 | Pickling of metals, etc. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US160527A US1719168A (en) | 1927-01-11 | 1927-01-11 | Pickling of metals, etc. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1719168A true US1719168A (en) | 1929-07-02 |
Family
ID=22577253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US160527A Expired - Lifetime US1719168A (en) | 1927-01-11 | 1927-01-11 | Pickling of metals, etc. |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1719168A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2478755A (en) * | 1945-11-30 | 1949-08-09 | Merck & Co Inc | Corrosion inhibitors |
| US2498684A (en) * | 1945-05-01 | 1950-02-28 | Jack K Y Hum | Chemical product |
| US2556333A (en) * | 1943-05-01 | 1951-06-12 | Oel Und Chemie Werk A G | Process for the manufacture of a novel binding agent for core sand from sulfite lye |
| US2556334A (en) * | 1943-05-01 | 1951-06-12 | Oel Und Chemie Werk A G | Process for the manufacture of a novel binding agent for core sand from sulfite lye |
| US2672484A (en) * | 1945-05-01 | 1954-03-16 | Macy Rudolph | Stabilization of levinstein mustard gas |
| US2899324A (en) * | 1959-08-11 | Nhxno | ||
| US3003970A (en) * | 1960-05-23 | 1961-10-10 | Dow Chemical Co | Cleaning composition and a method of its use |
| US3050359A (en) * | 1959-01-17 | 1962-08-21 | Degussa | Hexamethylene tetramine activated chlorite bleach |
| US3196113A (en) * | 1965-07-20 | Removal of flux from brazed aluminum assemblies | ||
| FR2348282A1 (en) * | 1976-04-13 | 1977-11-10 | Parker Ste Continentale | INHIBITOR FOR AQUEOUS ACID SOLUTIONS ESPECIALLY FOR PICKLING SOLUTIONS CONTAINING HYDROFLUORIC ACID |
| US4370256A (en) * | 1977-01-17 | 1983-01-25 | The Dow Chemical Company | Corrosion inhibitor for aluminum in aqueous acids |
| WO1997003167A1 (en) * | 1995-07-13 | 1997-01-30 | Henkel Corporation | Inhibited pickling acids containing chloride and zinc ions |
| US20070267046A1 (en) * | 2004-11-11 | 2007-11-22 | Areva Np Gmbh | Cleaning Process For Removing Magnetite-Containing Deposits From A Pressure Vessel Of A Power Station |
-
1927
- 1927-01-11 US US160527A patent/US1719168A/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3196113A (en) * | 1965-07-20 | Removal of flux from brazed aluminum assemblies | ||
| US2899324A (en) * | 1959-08-11 | Nhxno | ||
| US2556333A (en) * | 1943-05-01 | 1951-06-12 | Oel Und Chemie Werk A G | Process for the manufacture of a novel binding agent for core sand from sulfite lye |
| US2556334A (en) * | 1943-05-01 | 1951-06-12 | Oel Und Chemie Werk A G | Process for the manufacture of a novel binding agent for core sand from sulfite lye |
| US2498684A (en) * | 1945-05-01 | 1950-02-28 | Jack K Y Hum | Chemical product |
| US2672484A (en) * | 1945-05-01 | 1954-03-16 | Macy Rudolph | Stabilization of levinstein mustard gas |
| US2478755A (en) * | 1945-11-30 | 1949-08-09 | Merck & Co Inc | Corrosion inhibitors |
| US3050359A (en) * | 1959-01-17 | 1962-08-21 | Degussa | Hexamethylene tetramine activated chlorite bleach |
| US3003970A (en) * | 1960-05-23 | 1961-10-10 | Dow Chemical Co | Cleaning composition and a method of its use |
| FR2348282A1 (en) * | 1976-04-13 | 1977-11-10 | Parker Ste Continentale | INHIBITOR FOR AQUEOUS ACID SOLUTIONS ESPECIALLY FOR PICKLING SOLUTIONS CONTAINING HYDROFLUORIC ACID |
| US4370256A (en) * | 1977-01-17 | 1983-01-25 | The Dow Chemical Company | Corrosion inhibitor for aluminum in aqueous acids |
| WO1997003167A1 (en) * | 1995-07-13 | 1997-01-30 | Henkel Corporation | Inhibited pickling acids containing chloride and zinc ions |
| US20070267046A1 (en) * | 2004-11-11 | 2007-11-22 | Areva Np Gmbh | Cleaning Process For Removing Magnetite-Containing Deposits From A Pressure Vessel Of A Power Station |
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