US1755812A - Inhibitor material - Google Patents
Inhibitor material Download PDFInfo
- Publication number
- US1755812A US1755812A US393590A US39359029A US1755812A US 1755812 A US1755812 A US 1755812A US 393590 A US393590 A US 393590A US 39359029 A US39359029 A US 39359029A US 1755812 A US1755812 A US 1755812A
- Authority
- US
- United States
- Prior art keywords
- pickling
- bath
- inhibitor
- acid
- diamino diphenyl
- 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
- 239000003112 inhibitor Substances 0.000 title description 15
- 239000000463 material Substances 0.000 title description 7
- 238000005554 pickling Methods 0.000 description 26
- GUUVPOWQJOLRAS-UHFFFAOYSA-N Diphenyl disulfide Chemical compound C=1C=CC=CC=1SSC1=CC=CC=C1 GUUVPOWQJOLRAS-UHFFFAOYSA-N 0.000 description 22
- 229910052751 metal Inorganic materials 0.000 description 20
- 239000002184 metal Substances 0.000 description 20
- 239000002253 acid Substances 0.000 description 15
- 125000003698 tetramethyl group Chemical group [H]C([H])([H])* 0.000 description 12
- 150000002739 metals Chemical class 0.000 description 10
- 238000004140 cleaning Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 235000011149 sulphuric acid Nutrition 0.000 description 3
- 239000001117 sulphuric acid Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 125000006267 biphenyl group Chemical group 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000000266 injurious effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000005028 tinplate Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 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
- C23G1/065—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors sulfur-containing compounds
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
Patented Apr. 22, 1930 UNITED STATES Examin PATENT OFFICE LUDWIG J. CHRISTMANN,
C'YANAMID COMPANY, 01
OF JERSEY CITY, NEW JERSEY, ASSIGNOB TO AMERICAN NEW YORK, N. Y., A CORPORATION OF MAINE INHIBITOR MATERIAL No. Drawing.
This invention relates to methods of cleaning or pickling metals by subjecting the same to an acid bath.
In the metal industries, particularly in the manufacture of iron or steel sheets or the like, which are to be coated with protective metals such as tin, zinc or cadmium, it is a common expedient to first clean the metal surface in order that the subsequent coating material may adhere firmly thereto, without danger of peeling off of the coating. This cleaning treatment usually consists in providing a dilute solution of a non-oxidizing mineral acid material, such as sulphuric acid, called a pickling bath, and immersing the metal articles to be cleaned in the bath for a length of time sutficient to remove scale, oxide and other matter from the surface of the metal. The bath is usually maintained at a predetermined temperature, usually above room temperature, during the pickling operation.
The acid in the pickling hath not only acts to remove the undesirable surface materials but also tends to attack the metal itself and, to protect the metal from attack by the acid, there is usually added to the pickling bath a small amount of a substance called an inhibitor. The inhibitor permits the acid to remove the undesirable surface material from the metal and prevents, either in whole or in part. the action of the acid upon the metal itself. Ordinarily, in the absence of an inhibitor, the acid in attacking the metal gives off a substantial quantity of hydrogen or other gaseous substances with the production of an acid mist or spray which is injurious to the workmen and, in addition, results in appreciable loss of acid.
The present invention is intended to provide an inhibitor which may be prepared easily, which is low in cost and which is highly effective in a pickling bath even though present in small amounts.
I have discovered that tetramethyldiam i ng diphentirlisulfide is highly etltive as an inhibitor in a pickling bath. This material may be obtained in any suitable and well known manner.
The inhibitor constituting the subject mat- Application filed September 18, 1929. Serial No. 893,590.
ter of my invention was tested in a pickling bath in the following manner:
A pickling solution was prepared consisting of 250 cc. of dilute sulphuric acid containing 6% by weight of 66 B. acid. The solution was placed in a suitable vessel, maintained at a temperature of 183185 F. and 0.100 grams of tetramethyl diamino diphenyl disulfide was added to the solution. This is equivalent to about 4 one-hundredths of one percent of inhibitor in the bath.
Strips 3% long and wide of 30 gauge tin plate stock were used for the tests. The specimens were first cleaned with ether to remove any oil or grease on the surface, and, after drying were immersed in the pickling bath for five minutes to remove the oxide scale. The specimens were removed from the bath, dried and weighed. The specimens were immediately returned to the pickling bath, immersed for twenty minutes, washed, dried and weighed again. The loss in weight was determined and the specimens were subjected to another 20 minute test. Throughout the tests, check runs were made with similar pickling baths but without using any inhibitor. The table given below shows the results obtained with and without tetramethyl diamino diphenyl disulfide in the pickling bath:
, Initial Imm. 20min 25 3,
weight loss in loss in ofstnp loss total mm 40min loss Grams Gram Grams NO inhibitor inbath.---. 4.147 100.0 Tetramethyl diamino diphenyl disulflde in bath 4.081 0.135 0.238 3.3 5.8
From the above it is clear that tetramethyl diamino diphenyl disulfide is a good inhibitor and effectively curtails the action of the acid upon the metal. This is particularly true in view of the fact that the sample pickled in the bath containing no inhibitor was so rapidly dissolved in the acid that before the end of forty minutes it was completely in solution. Therefore, no effort was made to weigh the check samples during the tests. In similar tests carried out at higher was and lower temperatures, it was found that the tetamethyl diamino diphenyl disulfide was equally effective as at temperatures originally described.
Although I have described my invention in some detail, it is not limited to the specific matters set forth. The amounts of inhibitor used in pickling baths may, of course, be varied wldely and the nature of the bath may also be changed to suit any particular conditions which may prevail. In general, it is not necessary to use more than 1% of inhibitor in the bath and for most purposes less than 0.1% is sufiicient. It is to be understood that my invention is not to be limited except as set forth in the claims appended hereto.
I claim:
1. A method of cleaning or pickling metals which comprises subjecting the same to a pickling or cleaning bath containing a small amount of tetramethyl diamino diphenyl disulfide.
2. A method of cleaning or pickling metals which comprises subjecting the same to a pickling bath containing less than 1% of tetramethyl diamino diphenyl disulfide.
3. A method of cleaning or pickling metals which comprises subjecting the same to a pickling or cleaning bath containing less than 0.1% of tetramethyl diamino diphenyl disulfide.
4. A method of cleaning or pickling metals which comprises subjecting the same to a pickling or cleaning bath containing about 0.01% of tetramethyl diamino diphenyl disulfide.
5. A bath for pickling metals comprising a non-oxidizing mineral acid and a small amount of tetramethyl diamino diphenyl disulfide.
6. A bath for pickling metals comprising a non-oxidizing mineral acid and less than 1% of tetramethyl diamino diphenyl disulfide.
7. A bath for pickling metals comprising a non-oxidizing mineral acid and less than 0.1% of tetramethyl diamino diphenyl disulfide.
8. A bath for pickling metals comprising sulphuric acid and about 0.01% of tetramethyl diamino di henyl disulfide.
In testimony wiereof, 'I have hereunto subscribed my name this 16th day of September, 1929.
LUDWIG J. CHRISTMANN.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US393590A US1755812A (en) | 1929-09-18 | 1929-09-18 | Inhibitor material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US393590A US1755812A (en) | 1929-09-18 | 1929-09-18 | Inhibitor material |
Publications (1)
Publication Number | Publication Date |
---|---|
US1755812A true US1755812A (en) | 1930-04-22 |
Family
ID=23555373
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US393590A Expired - Lifetime US1755812A (en) | 1929-09-18 | 1929-09-18 | Inhibitor material |
Country Status (1)
Country | Link |
---|---|
US (1) | US1755812A (en) |
-
1929
- 1929-09-18 US US393590A patent/US1755812A/en not_active Expired - Lifetime
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