GB985024A - Improvements in or relating to electrolytic etching - Google Patents
Improvements in or relating to electrolytic etchingInfo
- Publication number
- GB985024A GB985024A GB1005861A GB1005861A GB985024A GB 985024 A GB985024 A GB 985024A GB 1005861 A GB1005861 A GB 1005861A GB 1005861 A GB1005861 A GB 1005861A GB 985024 A GB985024 A GB 985024A
- Authority
- GB
- United Kingdom
- Prior art keywords
- etching
- capacitor
- bath
- current
- switches
- 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
Links
- 238000000866 electrolytic etching Methods 0.000 title 1
- 239000003990 capacitor Substances 0.000 abstract 6
- 238000005530 etching Methods 0.000 abstract 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 2
- 108091081062 Repeated sequence (DNA) Proteins 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 239000012153 distilled water Substances 0.000 abstract 1
- 239000011888 foil Substances 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 239000011780 sodium chloride Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
- H01G9/055—Etched foil electrodes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
-
- 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
- C25F3/02—Etching
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
<PICT:0985024/C6-C7/1> <PICT:0985024/C6-C7/2> <PICT:0985024/C6-C7/3> Metal such as Al, e.g. for electrolytic capacitors or printing plates, is electrolytically etched to increase its surface area by a fluctuating unidirectional current produced by a repeated sequence comprising charging a capacitor from a D.C. source and then temporarily short circuiting the capacitor across an etching bath. Fig. 1 shows Al foil being etched in a bath 7, washed in a bath 20, e.g. of distilled water, and dried by lamps 21. Charging and discharging of a capacitor 4 is controlled by switches 2 and 5 or, in a modification, by switches 15 and 5. The switching sequence at 2 and 5 is controlled at 23. Fig. 2 shows the voltage Vc of capacitor 4 and etching current Ie during operation. From t1 to t2 switches 2 and 5 are closed, from t3 to t4 both switches are open, and from t4 to t5 switch 2 is closed and 5 open. The etching bath contains 2% NaCl solution at 74 DEG C. and is stirred by air or gas from a fan 6. Fig. 3 shows a further embodiment wherein individual electrodes 38 are etched while connected to a current rail 35. The time interval t1 t2 may be lengthened so that after the current has fallen to the value of the rectifier current, the rectifier current flows for a short while as a steady D.C. before it is switcher off. Capacitor discharge etching may be followed by D.C. etching at 5-20 Amps./dm.2. After etching, dielectric oxide may be formed on the metal in a forming bath at a voltage not exceeding 100 volts, e.g. 17 or 64 volts.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL249731 | 1960-03-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB985024A true GB985024A (en) | 1965-03-03 |
Family
ID=19752239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1005861A Expired GB985024A (en) | 1960-03-23 | 1961-03-20 | Improvements in or relating to electrolytic etching |
Country Status (6)
Country | Link |
---|---|
CH (1) | CH414298A (en) |
DE (1) | DE1230643B (en) |
DK (1) | DK103196C (en) |
ES (1) | ES265871A1 (en) |
GB (1) | GB985024A (en) |
NL (2) | NL126998C (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3316164A (en) * | 1964-04-23 | 1967-04-25 | Sprague Electric Co | Etching of aluminum foil |
FR2508696A1 (en) * | 1981-06-29 | 1982-12-31 | United Chemi Con Inc | Electrolytic etching of aluminium - uses improved alternating current waveform for more efficient etching |
EP0099086A2 (en) * | 1982-07-08 | 1984-01-25 | Hitachi Cable, Ltd. | Process for manufacturing copper-clad laminate and copper-clad laminate |
US5500101A (en) * | 1993-12-28 | 1996-03-19 | Nihon Chikudenki Kogyo Kabushiki Kaisha | Method of etching aluminum foil for electrolytic capacitor |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE971562C (en) * | 1952-09-23 | 1959-02-19 | Siemens Ag | Process for the electrolytic roughening of valve metal foils, in particular aluminum foils |
-
0
- NL NL249731D patent/NL249731A/xx unknown
- NL NL126998D patent/NL126998C/xx active
-
1961
- 1961-03-20 CH CH331361A patent/CH414298A/en unknown
- 1961-03-20 GB GB1005861A patent/GB985024A/en not_active Expired
- 1961-03-20 ES ES0265871A patent/ES265871A1/en not_active Expired
- 1961-03-20 DE DEN19765A patent/DE1230643B/en active Pending
- 1961-03-20 DK DK117461A patent/DK103196C/en active
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3316164A (en) * | 1964-04-23 | 1967-04-25 | Sprague Electric Co | Etching of aluminum foil |
FR2508696A1 (en) * | 1981-06-29 | 1982-12-31 | United Chemi Con Inc | Electrolytic etching of aluminium - uses improved alternating current waveform for more efficient etching |
EP0099086A2 (en) * | 1982-07-08 | 1984-01-25 | Hitachi Cable, Ltd. | Process for manufacturing copper-clad laminate and copper-clad laminate |
EP0099086A3 (en) * | 1982-07-08 | 1984-10-17 | Hitachi Cable, Ltd. | Process for manufacturing copper-clad laminate |
US5500101A (en) * | 1993-12-28 | 1996-03-19 | Nihon Chikudenki Kogyo Kabushiki Kaisha | Method of etching aluminum foil for electrolytic capacitor |
Also Published As
Publication number | Publication date |
---|---|
DE1230643B (en) | 1966-12-15 |
ES265871A1 (en) | 1961-09-16 |
CH414298A (en) | 1966-05-31 |
NL249731A (en) | |
DK103196C (en) | 1965-11-29 |
NL126998C (en) |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR910007222A (en) | Snubber circuit of power converter | |
GB985024A (en) | Improvements in or relating to electrolytic etching | |
GB780197A (en) | Improvements in or relating to spark-cutting apparatus | |
SU545123A1 (en) | Pulse generator for electrical discharge machining | |
SU108335A1 (en) | DC Discharge Switch | |
JPS5462595A (en) | Electrical discharge machine | |
SU516405A1 (en) | Defibrillator | |
SU146879A1 (en) | Electronic time switch | |
SU563257A1 (en) | Current pulse generator for electrical | |
JPS54136191A (en) | Ion laser device | |
SU122200A1 (en) | Device for periodically changing the polarity of a dc generator | |
SU124343A1 (en) | Pulsed light source | |
SU650230A1 (en) | Dc interrupter | |
SU18839A1 (en) | Automatic mercury release rectifier | |
JPS5488057A (en) | Turn-off circuit of gate turn-off thyristor | |
SU608632A1 (en) | Thyristor generator for electroerosion machines | |
SU763998A1 (en) | Switching device | |
JPS5536850A (en) | Electronic flash device | |
JPS56115179A (en) | Converter for automobile | |
JPS5583338A (en) | Control circuit of semiconductor element | |
JPS5488840A (en) | Discharge circuit in line explosive spraying | |
JPS57145581A (en) | Dc-ac power converter | |
GB519348A (en) | Improvements in or relating to metal vapour rectifiers | |
FR2161293A5 (en) | Plasma generator - with low voltage arc striking device | |
GB894492A (en) | Improvements relating to the operation of electric discharge lamps |