US2793191A - Corrosion inhibition of monobasic acids - Google Patents
Corrosion inhibition of monobasic acids Download PDFInfo
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- US2793191A US2793191A US423505A US42350554A US2793191A US 2793191 A US2793191 A US 2793191A US 423505 A US423505 A US 423505A US 42350554 A US42350554 A US 42350554A US 2793191 A US2793191 A US 2793191A
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- solution
- ferric
- acids
- stainless steels
- acid
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- 239000002253 acid Substances 0.000 title claims description 24
- 150000007513 acids Chemical class 0.000 title claims description 14
- 238000005260 corrosion Methods 0.000 title description 10
- 230000007797 corrosion Effects 0.000 title description 10
- 230000005764 inhibitory process Effects 0.000 title description 10
- 239000000243 solution Substances 0.000 claims description 28
- 229910001220 stainless steel Inorganic materials 0.000 claims description 19
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 150000003839 salts Chemical class 0.000 claims description 15
- 230000002401 inhibitory effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 9
- -1 IRON HALIDE Chemical class 0.000 claims description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- 229910001447 ferric ion Inorganic materials 0.000 description 14
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 235000006408 oxalic acid Nutrition 0.000 description 3
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 3
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- IIACRCGMVDHOTQ-UHFFFAOYSA-N sulfamic acid group Chemical class S(N)(O)(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 150000004820 halides Chemical group 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 229910018651 Mn—Ni Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 231100001010 corrosive Toxicity 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- VEPSWGHMGZQCIN-UHFFFAOYSA-H ferric oxalate Chemical compound [Fe+3].[Fe+3].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O VEPSWGHMGZQCIN-UHFFFAOYSA-H 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000000080 wetting agent 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/04—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly acid liquids
-
- 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
Definitions
- the objects of this invention are obtained by incorporating in the acid solution a minor amount of ferric ion by addition to the acid of a ferric salt, preferably a salt of substantial solubility, after which the 5 solution is employed in its customary manner without Michael A. Streicher, Wilmington, DeL, assignor to E. I.
- hibited solution may also contain wetting and dispersing agents to facilitate cleaning, where this is the objective, or may contain oxalic acid or sodium bisulfate either N Dra 1954 singly or in mixture, the inhibitory elfect of ferric ion as regards oxalic acid being taught in my application 5 Claims. (Cl. 252-447) S. N. 423,504 and as regards sodium bisulfate in my application S. N. 423,506, both filed on the same date as the instant application.
- This invention relates to the corrosion inhibition of
- the following table is a compilation of data covervarious monobasic acids as regards stainless steels, and ing a number of tests which demonstrate the efficacy of particularly to a method of inhibiting the corrosiveness the method of this invention as regards boiling aqueous in aqueous solution of one or more of the group comsolutions of individual members of the group of acids, prising formic, acetic, glycolic and sulfamic acids by the ferric salt utilized in each particular series of tests being indicated parenthetically under the acid involved Formic, acetic, glycolic and sulfamic acids are appreand the column headings being self-explanatory:
- glycolic acid and sulfamic acid have been employed with good results for the cleaning of stainless steel dairy equipment, since the calcium salts of these acids are watersoluble and are thus readily rinsed away.
- sulfamic acid particularly, in this application, is the development over a period of continued use of an adherent black coating, which interferes with visual inspection for cleanliness.
- ferric salts were employed in conducting the tests reported. These salts were employed individually, as distinguished from mixtures of one with another, and the preference, based on order of solubility in the acid solution inhibited, is in the order of recitetion. "The only requirement this invention is that the ferric salt utilized be appreciably soluble in the acid solution to be inhibited, so that ferric ion is contributed readily to the solution.
- Halogen salts such as the chloride,.flu'oride or bromide
- the salt concentration at which the inhibition-counteracting effect occurred was found to be considerably in excess of the ferric ion concentration which it was necessary to maintain for complete corrosion inhibition, and therefore ferric halides are effective for the purposes of this invention with the limitations mentioned.
- my invention comprises an effective method of inhibiting the corrosionof the acids reported with respect to the stainless steels, within which term it is'intended' to comprehend both the conventional stainless steels and the socalled substitute stainless steels, the 16% Cr-17% Mn-l% Ni composition being a typical member of the latter class, and that the limiting concentrations which are employed depend upon the particular :acid solution, the specific analysis of the stainless steel involved and the salt through which the ferric ion is introduced, all of which are subject to relatively wide modification, for which reasons it is intended to be limited only by the following'claims.
- the method of substantially inhibiting the corrosiveness in aqueous solution of at least one of the group consisting of formic, acetic, sulfamic and glycolic acids toward stainless steels comprising incorporating in said solution a minor quantity of a ferric ion-contributing salt other than an iron halide, but not less than an amount yielding from about 0.02 to about 0.23 gram/liter of ferric iron, depending upon the specific solution and steel involved, and thereafter contacting said stainless steels with said solution.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
CORROSION INHIBITION OF MONOBASIC ACIDS a corporation of Delaware the incorporation of ferric ion.
2,793,19I Patented May 21, 1951 Generally, the objects of this invention are obtained by incorporating in the acid solution a minor amount of ferric ion by addition to the acid of a ferric salt, preferably a salt of substantial solubility, after which the 5 solution is employed in its customary manner without Michael A. Streicher, Wilmington, DeL, assignor to E. I. e a to e fact that the mhlbltor sp du Pont de Nemours and Company, Wilmington, Del., hibited solution may also contain wetting and dispersing agents to facilitate cleaning, where this is the objective, or may contain oxalic acid or sodium bisulfate either N Dra 1954 singly or in mixture, the inhibitory elfect of ferric ion as regards oxalic acid being taught in my application 5 Claims. (Cl. 252-447) S. N. 423,504 and as regards sodium bisulfate in my application S. N. 423,506, both filed on the same date as the instant application.
This invention relates to the corrosion inhibition of The following table is a compilation of data covervarious monobasic acids as regards stainless steels, and ing a number of tests which demonstrate the efficacy of particularly to a method of inhibiting the corrosiveness the method of this invention as regards boiling aqueous in aqueous solution of one or more of the group comsolutions of individual members of the group of acids, prising formic, acetic, glycolic and sulfamic acids by the ferric salt utilized in each particular series of tests being indicated parenthetically under the acid involved Formic, acetic, glycolic and sulfamic acids are appreand the column headings being self-explanatory:
Min. Amt. of Fe Acid Con- Steel, AISI Designation Uninhibited Giving Complete Solution centration Unless Otherwise Indi- Corrosion Inhibition, Unless cated Rate, g./sq. Otherwise Indi- Percent dm./l1r. cated, in g./]iter 10 0.452 0.13. it a Bit Suli'amic Acid (ferric ion added as oxalate and sulfate 10 1 not individually)- miried as mini! mum). 10 34. 633 .17. 10 0.027 0.0023. 10 0.000 Acetic Acid (i'erric ion added as nitrate and oxalate in- 10 0.344 0.206. dividnally). 50 0. 048 0.110. 90.7 0.013 0.018. 99.7 0.017 0.012. 10 0.251 0.068. 10 2. 202 0.023. Formie Acid (ferric ion added as nitrate and oxalate in- 10 3. 79 0.182. divldually). 0. 404 0.110. 90 0. 244 0.017. 90 0.069 0.069. 10 0. 0844 0.076. Glycolic Acid (ferric ion added as oxalate and nitrate 18 81g? 823;? individually 10 0.0068 0.230. 70 0.200 0.076.
1 No corrosion, but specimen had brown coloration.
glycolic acid and sulfamic acid have been employed with good results for the cleaning of stainless steel dairy equipment, since the calcium salts of these acids are watersoluble and are thus readily rinsed away. One objection to the use of sulfamic acid, particularly, in this application, is the development over a period of continued use of an adherent black coating, which interferes with visual inspection for cleanliness.
It is an object of this invention to provide a method of inhibiting the corrosiveness of formic, acetic, glycolic and sulfamic acids alone or in mixture in aqueous solution for stainless steels. Another object of this invention is to provide a method of inhibiting the corrosiveness of these acids in aqueous solution while preventing objectionable contamination of the solutions, and while retaining the original bright surface of the stainless steel intact. Yet another object of this invention is to provide a method of inhibiting the corrosiveness of one or more of these acids in aqueous solution, with or without oxalic acid or sodium bisulfate added, as hereinafter described, for stainless steels which is cheap and not dangerous to using personnel.
The tests reported 'in the table were conducted over periods of 7 hours using boiling acids in the concentrations reported, the concentration level being main.- tained constant throughout the tests by the use of con densers which returned all material boiled ofi to the metal sample-containing flask during the course of the tests. Additional tests, not reported in the table, confirmed the corrosion inhibitory action of ferric ion for much greater periods of time, up to and beyond 60 hours and, independently, for exposures of the steels at lower temperatures. In all cases, except for A. I. S. I. 430 steel exposed to 10% acetic acid, the original bright finish of the steel was preserved intact upon exposure to the corrosion-inhibited acids. In contrast, uninhibited acids affect the finish deleteriously to varying degrees depending upon the particular acid, temperature and concentration involved. Yet other tests disclosed that the inhibition data reported for A. I. S. I. 304 steel is applicable within i-20% to the A. I. S. I. 300 series steels generally.
As will be apparent from the parenthetical notes adjacent each of the acids identified in the left-hand column of the table, a variety of ferric salts were employed in conducting the tests reported. These salts were employed individually, as distinguished from mixtures of one with another, and the preference, based on order of solubility in the acid solution inhibited, is in the order of recitetion. "The only requirement this invention is that the ferric salt utilized be appreciably soluble in the acid solution to be inhibited, so that ferric ion is contributed readily to the solution. Halogen salts, such as the chloride,.flu'oride or bromide, are not favored for inhibition service, not only because corro sive halide residues might-remain on'the metal surfaces if not removed by thorough rinsing, but also :because I have found that halo-gen ions exert an inhibition-counteracting effect on the ferric ions above certain limiting total salt concentration levels. In all cases investigated, the salt concentration at which the inhibition-counteracting effect occurred was found to be considerably in excess of the ferric ion concentration which it was necessary to maintain for complete corrosion inhibition, and therefore ferric halides are effective for the purposes of this invention with the limitations mentioned.
In this connection, the following data were obtained in testing samples of 304 stainless steel over periods of one hour in boiling sulfamic acid containing the tabulated amounts of ferric ion added as the chloride:
Corrosion rate in g./sq.dm.
Amount of iron added as ferric chloride, g./l. soln.
From these data it will be apparent that, while only, 0.13.
g./l. of iron is required for complete inhibition of type 304 steel under exposure to 10% sulfamic acid solution (refer previous table), complete inhibition persisted for more than three times this minimum, namely, 0.448 g./l., even when the ferric ion was incorporated via the chloride.
All of the data hereinbefore setout .is convertible to the basis of pentration in inches per month by simply multiplying by the factor 0.36.
The mechanism responsible for the corrosion inhibition of the acids reported toward stainless. steels by the ferric ion, While keeping the surface'brighn'is not understood; however, the effect appears to result from a specific property of the ion itself.
From the foregoing it will be understoodthat my invention comprises an effective method of inhibiting the corrosionof the acids reported with respect to the stainless steels, within which term it is'intended' to comprehend both the conventional stainless steels and the socalled substitute stainless steels, the 16% Cr-17% Mn-l% Ni composition being a typical member of the latter class, and that the limiting concentrations which are employed depend upon the particular :acid solution, the specific analysis of the stainless steel involved and the salt through which the ferric ion is introduced, all of which are subject to relatively wide modification, for which reasons it is intended to be limited only by the following'claims.
for operability according to What is claimed is:
1. The method of substantially inhibiting the corrosiveness in aqueous solution of at least one of the group consisting of formic, acetic, sulfamic and glycolic acids toward stainless steels comprising incorporating in said solution a minor quantity of a ferric ion-contributing salt other than an iron halide, but not less than an amount yielding from about 0.02 to about 0.23 gram/liter of ferric iron, depending upon the specific solution and steel involved, and thereafter contacting said stainless steels with said solution.
2. The method according to claim 1 in which said ferric ion-contributing salt consists of ferric oxalate.
3. The method of substantially inhibiting the corrosiveness in aqueous solution of at least one of the group consisting of formic, acetic, sulfamic and glycolic acids toward A. I. S. I. series 300 stainless steels comprising incorporating in said solution a quantity of a ferric ioncontributing salt other than an iron halide furnishing from about 0.02 to 0.13 gram of iron/liter of said solution depending upon the specific solution and the steel involved, and thereafter contacting said stainless steels with said solution.
4. The method of substantially inhibiting the corrosiveness in aqueous solution of at least one of the group consisting of formic, acetic, sulfamic and glycolic acids toward A. I. S. I. series 400 stainless steels comprising incorporating in said solution a quantity of a ferric ioncontributing salt other than an iron halide furnishing from about 0.02 to 0.77 gram of iron/liter of said solution depending upon the specific solution and the steel involved, and thereafter contacting said stainless steels with said solution.
5 The method of substantially inhibiting the corrosiveness in aqueous solution of at least one of the group consisting of formic, acetic, sulfamic and glycolic acids toward Cr-Mn-Ni stainless steels comprising incorporating in said solution a quantity of a ferric ion-contributin-g salt other than an iron halide furnishing from about 0.02 to 0.23 gram of iron/liter of 'said solution depending upon the specific solution and the steel in- -volved, and thereafter contacting said stainless steels with said solution.
OTHER REFERENCES Percival et. al.: Metal Industry, Feb. 20, 1942, pp. 144, 145.
Claims (1)
1. THE METHOD OF SUBSTANTIALLY INHIBITING THE CORROSIVENESS IN AQUEOUS SOLUTION OF AT LEAST ONE OF THE GROUP CONSISTING OF FORMIC, ACETIC, SULFAMIC AND GYLCOLIC ACIDS TOWARD STAINLESS STEELS COMPRISING INCORPORATING IN SAID SOLUTION A MINOR QUANTITY OF A FERRIC ION-CONTRIBUTING SALT OTHER THAN AN IRON HALIDE, BUT NOT LESS THAN AN AMOUNT YIELDING FROM ABOUT 0.02 TO ABOUT 0.23 GRAM/LITER OF FERRIC IRON, DEPENDING UPON THE SPECIFIC SOLUTION AND STEEL INVOLVED, AND THEREAFTER CONTACTING SAID STAINLESS STEELS WITH SAID SOLUTION
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US423505A US2793191A (en) | 1954-04-15 | 1954-04-15 | Corrosion inhibition of monobasic acids |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US423505A US2793191A (en) | 1954-04-15 | 1954-04-15 | Corrosion inhibition of monobasic acids |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2793191A true US2793191A (en) | 1957-05-21 |
Family
ID=23679132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US423505A Expired - Lifetime US2793191A (en) | 1954-04-15 | 1954-04-15 | Corrosion inhibition of monobasic acids |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2793191A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3003899A (en) * | 1957-05-17 | 1961-10-10 | Dow Chemical Co | Removal of scale deposits |
| US3033795A (en) * | 1957-06-10 | 1962-05-08 | Purex Corp Ltd | Compositions and process for removal of radioactive contaminants |
| US3118793A (en) * | 1960-12-06 | 1964-01-21 | Detrex Chem Ind | Method of pretreating and phosphatizing a metal surface for siccative coatings |
| US3266934A (en) * | 1962-12-04 | 1966-08-16 | John R Alexander | Removal of contaminants from interiors of enclosures |
| FR2413137A1 (en) * | 1977-12-27 | 1979-07-27 | Nissan Chemical Ind Ltd | PROCEDURE FOR ELIMINATING DEPOSITS CONTAINING CALCIUM OXALATE |
| US4469525A (en) * | 1983-01-19 | 1984-09-04 | Tennant Company | Membrane remover/etchant |
| US4608086A (en) * | 1983-01-19 | 1986-08-26 | Tennant Company | Membrane remover/etchant |
| EP0931854A1 (en) * | 1998-01-26 | 1999-07-28 | Elf Atochem S.A. | Corrosion inhibiting of stainless steel in organic sulphonic acid |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1334092A (en) * | 1918-07-29 | 1920-03-16 | John L Fay | Method of preparing metal to be galvanized or coated |
| DE375426C (en) * | 1922-09-12 | 1923-05-12 | Georg Kropfhammer | Procedure for derusting |
| US2220451A (en) * | 1938-02-09 | 1940-11-05 | Du Pont | Composition |
| US2474526A (en) * | 1940-06-15 | 1949-06-28 | Monsanto Chemicals | Picking of stainless steels |
| US2631950A (en) * | 1949-09-27 | 1953-03-17 | Rosenfeld Myer | Method of and composition for removing rust and scale |
-
1954
- 1954-04-15 US US423505A patent/US2793191A/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1334092A (en) * | 1918-07-29 | 1920-03-16 | John L Fay | Method of preparing metal to be galvanized or coated |
| DE375426C (en) * | 1922-09-12 | 1923-05-12 | Georg Kropfhammer | Procedure for derusting |
| US2220451A (en) * | 1938-02-09 | 1940-11-05 | Du Pont | Composition |
| US2474526A (en) * | 1940-06-15 | 1949-06-28 | Monsanto Chemicals | Picking of stainless steels |
| US2631950A (en) * | 1949-09-27 | 1953-03-17 | Rosenfeld Myer | Method of and composition for removing rust and scale |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3003899A (en) * | 1957-05-17 | 1961-10-10 | Dow Chemical Co | Removal of scale deposits |
| US3033795A (en) * | 1957-06-10 | 1962-05-08 | Purex Corp Ltd | Compositions and process for removal of radioactive contaminants |
| US3118793A (en) * | 1960-12-06 | 1964-01-21 | Detrex Chem Ind | Method of pretreating and phosphatizing a metal surface for siccative coatings |
| US3266934A (en) * | 1962-12-04 | 1966-08-16 | John R Alexander | Removal of contaminants from interiors of enclosures |
| FR2413137A1 (en) * | 1977-12-27 | 1979-07-27 | Nissan Chemical Ind Ltd | PROCEDURE FOR ELIMINATING DEPOSITS CONTAINING CALCIUM OXALATE |
| US4469525A (en) * | 1983-01-19 | 1984-09-04 | Tennant Company | Membrane remover/etchant |
| US4608086A (en) * | 1983-01-19 | 1986-08-26 | Tennant Company | Membrane remover/etchant |
| EP0931854A1 (en) * | 1998-01-26 | 1999-07-28 | Elf Atochem S.A. | Corrosion inhibiting of stainless steel in organic sulphonic acid |
| US6120619A (en) * | 1998-01-26 | 2000-09-19 | Elf Atochem, S.A. | Passivation of stainless steels in organosulphonic acid medium |
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