US2398079A - Composition for deanodizing aluminum and aluminum alloys - Google Patents
Composition for deanodizing aluminum and aluminum alloys Download PDFInfo
- Publication number
- US2398079A US2398079A US577152A US57715245A US2398079A US 2398079 A US2398079 A US 2398079A US 577152 A US577152 A US 577152A US 57715245 A US57715245 A US 57715245A US 2398079 A US2398079 A US 2398079A
- Authority
- US
- United States
- Prior art keywords
- aluminum
- composition
- deanodizing
- alloys
- aluminum alloys
- 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
- 239000000203 mixture Substances 0.000 title description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title description 6
- 229910052782 aluminium Inorganic materials 0.000 title description 5
- 229910000838 Al alloy Inorganic materials 0.000 title description 4
- 235000010210 aluminium Nutrition 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Substances OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 5
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 4
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000007743 anodising Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- NRUQNUIWEUZVLI-UHFFFAOYSA-O diethanolammonium nitrate Chemical compound [O-][N+]([O-])=O.OCC[NH2+]CCO NRUQNUIWEUZVLI-UHFFFAOYSA-O 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229940083542 sodium Drugs 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 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
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
Definitions
- This invention relates to a composition of matter and more particularly to a dry mixture of hemi-sodium phosphate and chromic acid adapted for use in deanodizing aluminum and aluminum carboys and is impracticable from an economical and commercial viewpoint as compared with the present composition which can be dispensed, shipped, and stored in solid form.
- the present composition consists of a dry mix-
- One of the standard methods of treating aluture of approximately 80% hemi-sod ium phosminum or aluminum alloy materials now in use phate (NaI-LzPOtHaPOU and zm'hromic acid. is the anodizing process.
- the alu- (CrOz) .mfimai is added to water when minum articles are immersed on aluminum racks it is desired to use it, preferably at the rate of 12 in a bath of the electrolyte, and an anodizing oimces per gallon of water.
- the solution is emcurrent passed therethrough. Eventually the ployed at about 180 F.
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)
- Chemical Treatment Of Metals (AREA)
Description
Patented Apr. 9, 1946 UNITED STATES PATENT OFFICE COMPOSITION FOR DEAN ODIZING ALUMI- NUM AND ALUMINUM ALLOYS Joseph Janota, Jr., Crete, and Bland B. Button,
Jr., Chicago, IlL, assignors to The Diversey Corporation, a corporation Illinois a No Drawing. Application February 9, 1945, I
Serial No. 577,152 a 1 Claim.
This invention relates to a composition of matter and more particularly to a dry mixture of hemi-sodium phosphate and chromic acid adapted for use in deanodizing aluminum and aluminum carboys and is impracticable from an economical and commercial viewpoint as compared with the present composition which can be dispensed, shipped, and stored in solid form.
alloys. 5 The present composition consists of a dry mix- One of the standard methods of treating aluture of approximately 80% hemi-sod ium phosminum or aluminum alloy materials now in use phate (NaI-LzPOtHaPOU and zm'hromic acid. is the anodizing process. In this process the alu- (CrOz) .mfimai is added to water when minum articles are immersed on aluminum racks it is desired to use it, preferably at the rate of 12 in a bath of the electrolyte, and an anodizing oimces per gallon of water. The solution is emcurrent passed therethrough. Eventually the ployed at about 180 F. and will completely strip racks themselves acquire a heavy odized coatthe anodized film from the aluminum racks withing. This coating has a high electric resistance in 3 to 10 minutes. The alum n is left bright and forms an insulation. The racks themselves and free from smut and is not corroded. are part of the electric circuit so that as the 15 The proportion of hemi-phosphoric acid maybe anodized coating builds up it interferes with the somewhat reduced, but as it is loweredit takes passage of electricity. Periodic stripping of this longer to strip the anodized coating. The chroanodized coating is, therefore, a requisite of the mic acid appears to be used up in the removal process. of the anodized film. It also acts to prevent cor- Various corrosive materials have been employed rosion by the phosphoric acid. The proportion of in the past for such stripping operation. The chromic acid, therefore, should not be reduced requisites of a suitable stripping bath are: greatly below the 20% limit. The proportion may,
(1) Ability to remove the anodized coating howevenbe somewhat increased. within a short period of time, generally less than The foregoing detailed description has been 15 minutes. given for clearness of understanding only, and no (2) Ability to leave the resulting surface bright unnecessary limitations should be understood and free from smut. therefrom.
(3) Non-corrosiveness to the underlying alu- What we claim as new, and desire to secure by minum. Letters Patent, is:
No combination of solid materials has hereto- A dry mix consisting essentially f hemifore been available which will satisfy all three of the above requirements. A mixture of liquid phosphoric acid and chromic acid may be employed satisfactorily but it must be handled in sodium phosphate and 20% chromic acid.
JOSEPH JANOI'A, JR. BLAND B. BUTTON, JR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US577152A US2398079A (en) | 1945-02-09 | 1945-02-09 | Composition for deanodizing aluminum and aluminum alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US577152A US2398079A (en) | 1945-02-09 | 1945-02-09 | Composition for deanodizing aluminum and aluminum alloys |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2398079A true US2398079A (en) | 1946-04-09 |
Family
ID=24307486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US577152A Expired - Lifetime US2398079A (en) | 1945-02-09 | 1945-02-09 | Composition for deanodizing aluminum and aluminum alloys |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2398079A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4419259A (en) * | 1981-10-22 | 1983-12-06 | Sprague Electric Company | Degreasing and deoxidizing aluminum foil |
-
1945
- 1945-02-09 US US577152A patent/US2398079A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4419259A (en) * | 1981-10-22 | 1983-12-06 | Sprague Electric Company | Degreasing and deoxidizing aluminum foil |
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