US1996730A - Corrosion inhibitor - Google Patents
Corrosion inhibitor Download PDFInfo
- Publication number
- US1996730A US1996730A US693148A US69314833A US1996730A US 1996730 A US1996730 A US 1996730A US 693148 A US693148 A US 693148A US 69314833 A US69314833 A US 69314833A US 1996730 A US1996730 A US 1996730A
- Authority
- US
- United States
- Prior art keywords
- thiourea
- acid
- corrosion
- nitrosamine
- compounds
- 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
- 238000005260 corrosion Methods 0.000 title description 13
- 230000007797 corrosion Effects 0.000 title description 13
- 239000003112 inhibitor Substances 0.000 title description 3
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 25
- 239000002253 acid Substances 0.000 description 17
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 13
- 150000001875 compounds Chemical class 0.000 description 9
- UMFJAHHVKNCGLG-UHFFFAOYSA-N n-Nitrosodimethylamine Chemical compound CN(C)N=O UMFJAHHVKNCGLG-UHFFFAOYSA-N 0.000 description 8
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 150000002739 metals Chemical class 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XKLJHFLUAHKGGU-UHFFFAOYSA-N nitrous amide Chemical compound ON=N XKLJHFLUAHKGGU-UHFFFAOYSA-N 0.000 description 4
- -1 alkyl nitrosamine Chemical compound 0.000 description 3
- 150000004005 nitrosamines Chemical class 0.000 description 3
- 150000003585 thioureas Chemical class 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- OMWZFUMAEUREHT-UHFFFAOYSA-N 1,1-dipentyl-3-phenylthiourea Chemical compound CCCCCN(CCCCC)C(=S)NC1=CC=CC=C1 OMWZFUMAEUREHT-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- OELWBYBVFOLSTA-UHFFFAOYSA-N n,n-dipentylnitrous amide Chemical compound CCCCCN(N=O)CCCCC OELWBYBVFOLSTA-UHFFFAOYSA-N 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
Definitions
- the present invention relates to the prevention 01' corrosion of metals such as iron and steel by acids and is particularly concerned with the avoidance of corrosion of these substances in acid pickling baths and in the form of metal containers in which acid is stored.
- Diamyl nitrosamine for example, has been found to be-eflective in conjunction with compounds of the thiourea group and diamyl phenyl thiourea is effective in conjunctfoTwiththe nitrosamines.
- a process for reducing the corrosion of Q metals by an acid in contact therewith which comprises adding to such acid a derivative of thiourea chosen from the class consisting of thiourea and substituted thioureas and an alkyl nitrosamine.
- a process Ior reducing the corrosion of metals by an acid in contact therewith which comprises adding to such acid ditolyl thiourea and an alkyl nitrosamine.
- a process for reducing the corrosion of metals by an acid in contact therewith which comprises adding to such acid ditolyl thiourea and a dialkyl nitrosamine.
- a process for reducing the corrosion of metals by an acid in contact therewith which comprises addingto such acid a derivative of
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)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
252. COMPOSITIONS.
Patented Apr. 2, 1935- UNITED STATES Cross Reference PATENT OFFICE CORROSION INHIBITOR Charles A. Thomas, Wayne, and Charles G. Grosscup, Philadelphia, Pa., assignors to The Sharples Solvents Corporation, Philadelphia, Pa., a'corporation of Delaware No Drawing. Application October 11, 1933; Serial No. 693,148
6 Claims. (01. lie-8.1)
The present invention relates to the prevention 01' corrosion of metals such as iron and steel by acids and is particularly concerned with the avoidance of corrosion of these substances in acid pickling baths and in the form of metal containers in which acid is stored.
It hasbeen known for some time that thiourea and ra g pi smmrdefivmves; such asditolyl thiourea possess the property of preventing corrov sion 01' iron articles to a remarkable extent when these compounds are incorporated in small amounts in acids which tend to attack such articles. The present invention rests upon the discovery that the corrosion inhibiting properties 01 these compounds are greatly enhanced by the admixture therewith of a substantial proportion oi'an 'alkyl nitrosamine, the lower members of the eries .9 .i k nitriisfimlnes' a i be n found to be unusually effective for this purpose. By use of a properly proportioned mixture of 'ditolyl thiourea in conjunction with dimethyl nitrosamine, for example, it is possible to minimize corrosion of this type to a very remarkable extent.
While it is a well-known fact that compounds of the thiourea type inhibit corrosion oi metals by acid, and we have found that nitrosamines likewise inhibit corrosion 01' this character, the effect of the addition of a thiourea in conjunction with a nitrosamine to an acid for the purpose of reducing its corrosive eii'ects has been found to be very much greater than would be expected from a consideration of the inhibiting properties of the individual compounds. Although the advantages of the invention are obtained throughout a wide range of relative proportions of these inhibiting compounds, the best results have been attained in cases in which at least as much nitrosamine as thiourea is present.
The following examples illustrate the practice of the invention:
' when used alone, has very little inhibiting eii'ect.
'(clhslmiiarstripwasimmersedinasimilar acid bath containing 1% di-orthoj; lyl thiourea under conditions similar-"r6" those discussed at (a) above. The strip lost 0.06% of its original weight in this test.
(d) A similar strip was immersed in a similar acid bath containing 1% di-ortho tolyl thiourea and 1% dimethyl nitrosamine, under conditions similar to those discussed at (a) and (0) above. The strip lost 0.005% of its original weight in this test, indicating that the addition oi the nitrosamine to the thiourea decreased the amount of corrosion by more than (e) A steel test strip having an area of 680 square millimeters was immersed in 1:4 hydrochloric acid in the absence of any inhibitor for a period of 4'7 hours at a temperature of 25 C. At the conclusion of this periodthe strip had lost 7.9% of its original weight.
(I) Tests with similar strips immersed in similar acid solutions containing varying proportions of dimethyl nitrosamine indicated that this compound, when used alone, has very little III Tests with other nitrosamines in conjunction with other'derivatives of thiourea indicated that while optimum results appear to be obtained by the use of di-ortho tolyl thiourea and dimethyl nitrosamine, the advantages of the invention may be at least in part obtained by the substitution of other compounds from these two groups for the specific compounds of the above illustrative examples. Diamyl nitrosamine, for example, has been found to be-eflective in conjunction with compounds of the thiourea group and diamyl phenyl thiourea is effective in conjunctfoTwiththe nitrosamines.
We claim:
1. A process for reducing the corrosion of Q metals by an acid in contact therewith which comprises adding to such acid a derivative of thiourea chosen from the class consisting of thiourea and substituted thioureas and an alkyl nitrosamine.
2. A process Ior reducing the corrosion of metals by an acid in contact therewith which comprises adding to such acid ditolyl thiourea and an alkyl nitrosamine.
3. A process for reducing the corrosion of metals by an acid in contact therewith which comprises adding to such acid ditolyl thiourea and a dialkyl nitrosamine.
4. A process for reducing the corrosion of metals by an acid in contact therewith which comprises addingto such acid a derivative of
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US693148A US1996730A (en) | 1933-10-11 | 1933-10-11 | Corrosion inhibitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US693148A US1996730A (en) | 1933-10-11 | 1933-10-11 | Corrosion inhibitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1996730A true US1996730A (en) | 1935-04-02 |
Family
ID=24783514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US693148A Expired - Lifetime US1996730A (en) | 1933-10-11 | 1933-10-11 | Corrosion inhibitor |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1996730A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2716721A (en) * | 1955-08-30 | Electrolyte | ||
| US2755235A (en) * | 1951-10-26 | 1956-07-17 | Ethyl Corp | Process for benzene hexachloride purification |
| US2947703A (en) * | 1958-07-16 | 1960-08-02 | Nalco Chemical Co | Process of inhibiting corrosion of ferrous metals in contact with aqueous solutions of acids |
| US2959555A (en) * | 1956-09-28 | 1960-11-08 | Dow Chemical Co | Copper and iron containing scale removal from ferrous metal |
| US3009849A (en) * | 1958-06-04 | 1961-11-21 | Conversion Chem Corp | Aluminum brightening solution and method |
| US3033793A (en) * | 1958-08-13 | 1962-05-08 | Photo Engravers Res Inc | Powderless etching of copper photoengraving plates |
| US3114657A (en) * | 1960-08-29 | 1963-12-17 | John W Stilwell | Composition and method for cleaning and stripping metals |
| US9567510B2 (en) | 2014-09-11 | 2017-02-14 | Halliburton Energy Services, Inc. | Cyanamide-based carbon dioxide and/or hydrogen sulfide scavengers and methods of use in subterranean operations |
-
1933
- 1933-10-11 US US693148A patent/US1996730A/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2716721A (en) * | 1955-08-30 | Electrolyte | ||
| US2755235A (en) * | 1951-10-26 | 1956-07-17 | Ethyl Corp | Process for benzene hexachloride purification |
| US2959555A (en) * | 1956-09-28 | 1960-11-08 | Dow Chemical Co | Copper and iron containing scale removal from ferrous metal |
| US3009849A (en) * | 1958-06-04 | 1961-11-21 | Conversion Chem Corp | Aluminum brightening solution and method |
| US2947703A (en) * | 1958-07-16 | 1960-08-02 | Nalco Chemical Co | Process of inhibiting corrosion of ferrous metals in contact with aqueous solutions of acids |
| US3033793A (en) * | 1958-08-13 | 1962-05-08 | Photo Engravers Res Inc | Powderless etching of copper photoengraving plates |
| US3114657A (en) * | 1960-08-29 | 1963-12-17 | John W Stilwell | Composition and method for cleaning and stripping metals |
| US9567510B2 (en) | 2014-09-11 | 2017-02-14 | Halliburton Energy Services, Inc. | Cyanamide-based carbon dioxide and/or hydrogen sulfide scavengers and methods of use in subterranean operations |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2956956A (en) | Inhibitors for acid solutions employed in the surface treatment of metals | |
| US2739871A (en) | Composition and sheet material for inhibition of corrosion of metals | |
| US2838458A (en) | Inhibited methyl chloroform | |
| US2913408A (en) | Corrosion inhibitors for ferrous metals in aqueous solutions of non-oxidizing acids | |
| US1996730A (en) | Corrosion inhibitor | |
| US2926108A (en) | Process for inhibiting corrosion of metals | |
| US3294695A (en) | Corrosion inhibiting compositions and processes | |
| US3049496A (en) | Propargyl compounds as corrosion inhibitors | |
| US2520356A (en) | Method for inhibiting corrosion of ferrous metal | |
| US3047510A (en) | Corrosion inhibiting compositions and process | |
| US2624706A (en) | Noncorrosive fire extinguishing composition | |
| US2014924A (en) | Treatment of motor fuel | |
| US2617771A (en) | Corrosion retarder | |
| US3457185A (en) | Corrosion inhibited acidic solutions containing alkyl hexahydropyrimidine-2-thione and quaternary ammonium compounds | |
| US2981759A (en) | Stabilization of chlorinated hydrocarbons with a synergistic combination of a tertiary acetylenic alcohol, dioxane, and a volatile basic organic nitrogen-containing organic compound | |
| US2708184A (en) | Tincture of iodine as acid pickling inhibitor | |
| US2459119A (en) | Corrosion retarder | |
| US3226180A (en) | Process of conditioning metal surfaces and compositions therefor | |
| JPS595563B2 (en) | Stabilization of 1,1,1-trichloroethane | |
| US1961097A (en) | Inhibiting process and product | |
| US3282850A (en) | Corrosion inhibition with dipropargyl butylamine | |
| US2993007A (en) | Nu-alkylheterocyclic nitroge-containing derivatives as corrosion-inhibitors | |
| US3979311A (en) | Corrosion inhibitor compositions | |
| US1817500A (en) | Treating metals and compositions therefor | |
| US2873196A (en) | Rust preventative and anti-rust stabilizing compositions |