US3068158A - Anodic brightening and polishing of metal - Google Patents
Anodic brightening and polishing of metal Download PDFInfo
- Publication number
- US3068158A US3068158A US787813A US78781359A US3068158A US 3068158 A US3068158 A US 3068158A US 787813 A US787813 A US 787813A US 78781359 A US78781359 A US 78781359A US 3068158 A US3068158 A US 3068158A
- Authority
- US
- United States
- Prior art keywords
- brightening
- metal
- anodic
- acid
- polishing
- 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
- 238000005282 brightening Methods 0.000 title claims description 11
- 229910052751 metal Inorganic materials 0.000 title description 7
- 239000002184 metal Substances 0.000 title description 7
- 238000005498 polishing Methods 0.000 title description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 14
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 7
- 229910052788 barium Inorganic materials 0.000 claims description 7
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 239000003792 electrolyte Substances 0.000 claims description 4
- 238000005530 etching Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000012047 saturated solution Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000001117 sulphuric acid Substances 0.000 description 4
- 235000011149 sulphuric acid Nutrition 0.000 description 4
- 235000011054 acetic acid Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 150000001243 acetic acids Chemical class 0.000 description 1
- 229910001422 barium ion Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/16—Polishing
- C25F3/22—Polishing of heavy metals
- C25F3/24—Polishing of heavy metals of iron or steel
Definitions
- an etching bath consisting essentially of fiuoboric acid and concentrated phosphoric acid in water-free form.
- the use of such an acid mixture according to the invention eliminates the explosion danger of the conventional perchloric acid tures and also excels them in brightening effect.
- an anodic bath according to the invention is not damaged by high cathodic and anodic current densities.
- the brightening eifect of the electrolyte according to t e invention is not appreciably dependent upon temperature and is obtained within a wide range of current densities. Good results are secured particularly when operating at normal room temperature (20 C.) with anodic current densities of 40 amps. per cm.
- the preparation of water-free solutions of fluoboric acid and phosphoric acid and/ or acetic acid is preferably carried out with the aid of water-free barium borofluorate.
- the fluorate is produced in conventional manner and has been found readily soluble in concentrated phosphoric and/ or acetic acids.
- a saturated solution of barium borofluoride in concentrated phosphortic acid is used.
- the effect is further improved if, prior to using the solution, the barium ions are caused to precipitate by adding concentrated sulphuric acid to the bath in stoichiometric quantity relative to the barium content of the bath.
- the resulting barium sulphate is practically completely insoluble in the resulting acid mixture. A slight excess of sulphuric acid does not impair the polishing action of the bath.
- a method of brightening steel and iron metal comprising subjecting the metal to anodic etching in a waterfree electrolyte consisting of a water-free saturated solution of barium borofluoride in water-free phosphoric acid.
- a method of brightening steel and iron metal com prising subjecting the metal to anodic etching in an essentially water-free electrolyte consisting of a water-free solution of fiuoboric acid in water-free phosphoric acid, said solution being prepared by dissolving barium borofluoride in phosphoric acid to saturation of the latter and precipitating the barium as barium sulfate by adding a stoichiometric amount of sulfuric acid.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES56772A DE1085391B (de) | 1958-01-30 | 1958-01-30 | Elektrolyt zum anodischen Polieren von Metallen und Verfahren zu seiner Herstellung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3068158A true US3068158A (en) | 1962-12-11 |
Family
ID=7491345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US787813A Expired - Lifetime US3068158A (en) | 1958-01-30 | 1959-01-20 | Anodic brightening and polishing of metal |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3068158A (de) |
| DE (1) | DE1085391B (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3725224A (en) * | 1971-06-30 | 1973-04-03 | Rohr Industries Inc | Composition for electrolytic descaling of titanium and its alloys |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2108603A (en) * | 1933-08-02 | 1938-02-15 | Aluminum Co Of America | Production of aluminum reflecting surfaces |
| GB550175A (en) * | 1941-06-20 | 1942-12-28 | Magnesium Metal Corp Ltd | Process for the anodic polishing of magnesium and of magnesium base alloys |
| GB618120A (en) * | 1946-09-18 | 1949-02-16 | Alais & Froges & Camarque Cie | Method for pickling, polishing and brightening metals and alloys |
| GB630854A (en) * | 1945-03-02 | 1949-10-24 | Fr Hispano Suiza Soc | Improvements in finishing treatments for machine parts |
| US2521106A (en) * | 1946-01-19 | 1950-09-05 | C G Coun Ltd | Method and bath for electropolishing |
| US2920023A (en) * | 1955-04-04 | 1960-01-05 | Chrysler Corp | Electrolytic cleaning of metal and composition therefor |
| US2928777A (en) * | 1950-12-16 | 1960-03-15 | Electro Process Inc | Electrolytic polishing of metals |
| US2986499A (en) * | 1958-01-17 | 1961-05-30 | Du Pont | Electropolishing steel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2542779A (en) * | 1948-01-07 | 1951-02-20 | Columbus Metal Products Inc | Electropolishing composition and process |
-
1958
- 1958-01-30 DE DES56772A patent/DE1085391B/de active Pending
-
1959
- 1959-01-20 US US787813A patent/US3068158A/en not_active Expired - Lifetime
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2108603A (en) * | 1933-08-02 | 1938-02-15 | Aluminum Co Of America | Production of aluminum reflecting surfaces |
| GB550175A (en) * | 1941-06-20 | 1942-12-28 | Magnesium Metal Corp Ltd | Process for the anodic polishing of magnesium and of magnesium base alloys |
| GB630854A (en) * | 1945-03-02 | 1949-10-24 | Fr Hispano Suiza Soc | Improvements in finishing treatments for machine parts |
| US2521106A (en) * | 1946-01-19 | 1950-09-05 | C G Coun Ltd | Method and bath for electropolishing |
| GB618120A (en) * | 1946-09-18 | 1949-02-16 | Alais & Froges & Camarque Cie | Method for pickling, polishing and brightening metals and alloys |
| US2928777A (en) * | 1950-12-16 | 1960-03-15 | Electro Process Inc | Electrolytic polishing of metals |
| US2920023A (en) * | 1955-04-04 | 1960-01-05 | Chrysler Corp | Electrolytic cleaning of metal and composition therefor |
| US2986499A (en) * | 1958-01-17 | 1961-05-30 | Du Pont | Electropolishing steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3725224A (en) * | 1971-06-30 | 1973-04-03 | Rohr Industries Inc | Composition for electrolytic descaling of titanium and its alloys |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1085391B (de) | 1960-07-14 |
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