US3912603A - Electrolytic bath for the removal of metals - Google Patents
Electrolytic bath for the removal of metals Download PDFInfo
- Publication number
- US3912603A US3912603A US533719A US53371974A US3912603A US 3912603 A US3912603 A US 3912603A US 533719 A US533719 A US 533719A US 53371974 A US53371974 A US 53371974A US 3912603 A US3912603 A US 3912603A
- Authority
- US
- United States
- Prior art keywords
- bath
- acid
- salts
- iodine compound
- iodine
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F5/00—Electrolytic stripping of metallic layers or coatings
Definitions
- the present invention relates to an electrolytic bath for removing metallic coatings, such as nickel, chromium, zinc, tin, copper, cadmium or silver plate, from steel parts, the bath containing, in aqueous solution, nitric acid and/or its salts with inorganic and/or organic bases, organic acids and/or their salts, and a watersoluble halogen compound.
- metallic coatings such as nickel, chromium, zinc, tin, copper, cadmium or silver plate
- German published Specification Offenlegungsschrift l 963 415 describes an electrolytic demetallizing bath containing amines, nitrates, organic acids and water-soluble chlorine compounds.
- the above baths contain amines or aminoalcohols, especially those which have up to carbon atoms.
- the amines include primary, secondary and tertiary amines, such as trimethylamine, diethyland triethylamines, ethylene triamines, mono-, diand triethanol.
- the organic solvents used in the above baths are formic acid, acetic acid, propionic acid, oxalic acid, malonic acid, lactic acid and citric acid, or the alkali metal and/or ammonium salts thereof.
- the chlorine or bromine compounds are accelerators necessary to effect the removal of metal layers, particularly semi-polished nickel, within a reasonable period of time.
- they are activators of considerably increased corrosiveness for the base metal. Needless to say, it is practically impossible completely to inhibit corrosion of the base material, in an anodicelectrolytic operation.
- the object of the present invention can unexpectedly be achieved with the use of a bath, wherein the halogen compound is a soluble iodine compound, preferably an iodide.
- the baths of the present invention contain, as further known constituents, nitric acid and/or its salts with an alkali metal hydroxide or ammonium hydroxide or with an aliphatic amine or aminoalcohol or a blend of these salts, in proportions within the range 15 and 60 g/l, as well as organic acids, such as formic acid, acetic acid, propionic acid, oxalic acid, malonic acid, lactic acid or citric acid, or blends thereof, their salts or salt blends, in preferred proportions within the range 10 and 40 g/l.
- organic acids such as formic acid, acetic acid, propionic acid, oxalic acid, malonic acid, lactic acid or citric acid, or blends thereof, their salts or salt blends, in preferred proportions within the range 10 and 40 g/l.
- the difficultly soluble iodine compounds can be used in the form of solid phase material lying on the bottom of the bath, or to be placed in anode bags, for example, which'are suspended from a holder and continually contacted with the electrolyte.
- the electrolytic demetallization being critically determined by the addition of the halogen compound, it is absolutely necessary to avoid overfeeding of the bath with halogen.
- difficultly soluble iodine compounds e.g. copper-I-iodide, which produce a bath wherein the iodine content need not be controlled analytically. Overfeeding with iodine is practically excluded as the bath having the difficultly soluble iodine compounds therein is a self-controlling demetallization bath which is easy to handle.
- Baths containing soluble iodine compounds enable metal coatings to be removed from steel at least as rapidly as with the use of analogous baths containing chlorine or bromine compounds, and they combine this with considerably reduced corrosiveness for the steel itself.
- Baths containing readily and difficultly soluble chlorine and bromine compounds, respectively, and baths containing difficultly soluble iodine compounds are compared with each other hereinafter.
- the basic electrolyte was composed of: g/l of triethanolamine, 48 g/l of HNO of 63 strength, and
- EXAMPLE 2 The basic electrolyte and the electrolytic conditions were the same as those used in Example 1, save that the base material was stainless steel (material No. I4 571 (German Industrial Standard X CrNiMoTi 1810)).
- Electrolytic bath for removing metallic coatings, such as nickel, chromium, zinc, tin, copper, cadmium or silver plate, from steel parts the bath containing, in aqueous solution,
- a at least one substance selected from the group consisting of nitric acid and its salts with inorganic and organic bases;
- a water-soluble halogen compound being characterized in that the halogen compound is a soluble iodine compound.
- an organic acid being selected from the group consisting of formic acid, acetic acid, propionic acid, oxalic acid, malonic acid, lactic acid or citric acid.
- the bath as claimed in claim 13 having a pH-value between 6.5 and 7.5.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- ing And Chemical Polishing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2363352A DE2363352C3 (de) | 1973-12-20 | 1973-12-20 | Bad zum elektrolytischen Ablösen von Metallen |
Publications (1)
Publication Number | Publication Date |
---|---|
US3912603A true US3912603A (en) | 1975-10-14 |
Family
ID=5901294
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US533719A Expired - Lifetime US3912603A (en) | 1973-12-20 | 1974-12-17 | Electrolytic bath for the removal of metals |
Country Status (9)
Country | Link |
---|---|
US (1) | US3912603A (fr) |
BE (1) | BE823676A (fr) |
CH (1) | CH603833A5 (fr) |
DE (1) | DE2363352C3 (fr) |
FR (1) | FR2255397B1 (fr) |
GB (1) | GB1444699A (fr) |
IT (1) | IT1026066B (fr) |
NL (1) | NL7416696A (fr) |
SE (1) | SE7415930L (fr) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4090935A (en) * | 1977-07-12 | 1978-05-23 | The United States Of America As Represented By The Secretary Of The Interior | Process for recovering silver, copper and stainless steel from silver brazed stainless steel sections |
US4233124A (en) * | 1979-10-29 | 1980-11-11 | Oxy Metal Industries Corporation | Electrolytic stripping bath and process |
US4264420A (en) * | 1979-10-29 | 1981-04-28 | Oxy Metal Industries Corporation | Electrolytic stripping bath and process |
US4264419A (en) * | 1979-10-09 | 1981-04-28 | Olin Corporation | Electrochemical detinning of copper base alloys |
US4400248A (en) * | 1982-03-08 | 1983-08-23 | Occidental Chemical Corporation | Electrolytic stripping process |
DE3318598A1 (de) * | 1982-05-27 | 1983-12-01 | Occidental Chemical Corp., 48089 Warren, Mich. | Bad und verfahren fuer die elektrolytische entfernung von ueberzuegen aus kupfer, kupferlegierung oder chrom von einem eisenhaltigen grundmetall |
WO1986006763A1 (fr) * | 1985-05-08 | 1986-11-20 | M&T Chemicals Inc. | Procede de detachement de nickel ou d'un revetement d'un alliage de nickel et de fer dans une solution d'acide chromique |
US4968397A (en) * | 1989-11-27 | 1990-11-06 | Asher Reginald K | Non-cyanide electrode cleaning process |
US5071713A (en) * | 1988-03-17 | 1991-12-10 | N. V. Bekaert S.A. | Metal fibers obtained by bundled drawing |
USRE34227E (en) * | 1989-11-27 | 1993-04-20 | Motorola, Inc. | Non-cyanide electrode cleaning process |
US20110083972A1 (en) * | 2009-10-08 | 2011-04-14 | First Solar, Inc. | Electrochemical method and apparatus for removing coating from a substrate |
WO2016147709A1 (fr) * | 2015-03-13 | 2016-09-22 | 奥野製薬工業株式会社 | Agent de décapage électrolytique pour un gabarit |
CN106367803A (zh) * | 2016-09-05 | 2017-02-01 | 上海瑞尔实业有限公司 | 一种塑料电镀挂具铜镍铬镀层剥离方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004053135A1 (de) * | 2004-10-29 | 2006-05-04 | Siemens Ag | Verfahren zum Abtragen einer Beschichtung von einem Bauteil |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2371529A (en) * | 1941-09-20 | 1945-03-13 | Dow Chemical Co | Removal of electrodeposited metals |
US2581490A (en) * | 1947-03-11 | 1952-01-08 | Gen Motors Corp | Electrolytic process of stripping metallic coatings from a ferrous metal base |
US3151049A (en) * | 1958-09-29 | 1964-09-29 | Union Carbide Corp | Electrolytic method of and bath for stripping coatings from bases |
US3819494A (en) * | 1973-03-29 | 1974-06-25 | Fountain Plating Co Inc | Method of removing braze |
-
1973
- 1973-12-20 DE DE2363352A patent/DE2363352C3/de not_active Expired
-
1974
- 1974-12-11 CH CH1648374A patent/CH603833A5/xx not_active IP Right Cessation
- 1974-12-17 US US533719A patent/US3912603A/en not_active Expired - Lifetime
- 1974-12-18 SE SE7415930A patent/SE7415930L/xx unknown
- 1974-12-18 IT IT54626/74A patent/IT1026066B/it active
- 1974-12-18 GB GB5461474A patent/GB1444699A/en not_active Expired
- 1974-12-20 FR FR7442318A patent/FR2255397B1/fr not_active Expired
- 1974-12-20 BE BE151780A patent/BE823676A/fr not_active IP Right Cessation
- 1974-12-20 NL NL7416696A patent/NL7416696A/xx not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2371529A (en) * | 1941-09-20 | 1945-03-13 | Dow Chemical Co | Removal of electrodeposited metals |
US2581490A (en) * | 1947-03-11 | 1952-01-08 | Gen Motors Corp | Electrolytic process of stripping metallic coatings from a ferrous metal base |
US3151049A (en) * | 1958-09-29 | 1964-09-29 | Union Carbide Corp | Electrolytic method of and bath for stripping coatings from bases |
US3819494A (en) * | 1973-03-29 | 1974-06-25 | Fountain Plating Co Inc | Method of removing braze |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4090935A (en) * | 1977-07-12 | 1978-05-23 | The United States Of America As Represented By The Secretary Of The Interior | Process for recovering silver, copper and stainless steel from silver brazed stainless steel sections |
US4264419A (en) * | 1979-10-09 | 1981-04-28 | Olin Corporation | Electrochemical detinning of copper base alloys |
US4233124A (en) * | 1979-10-29 | 1980-11-11 | Oxy Metal Industries Corporation | Electrolytic stripping bath and process |
US4264420A (en) * | 1979-10-29 | 1981-04-28 | Oxy Metal Industries Corporation | Electrolytic stripping bath and process |
US4400248A (en) * | 1982-03-08 | 1983-08-23 | Occidental Chemical Corporation | Electrolytic stripping process |
DE3318598A1 (de) * | 1982-05-27 | 1983-12-01 | Occidental Chemical Corp., 48089 Warren, Mich. | Bad und verfahren fuer die elektrolytische entfernung von ueberzuegen aus kupfer, kupferlegierung oder chrom von einem eisenhaltigen grundmetall |
WO1986006763A1 (fr) * | 1985-05-08 | 1986-11-20 | M&T Chemicals Inc. | Procede de detachement de nickel ou d'un revetement d'un alliage de nickel et de fer dans une solution d'acide chromique |
US4664763A (en) * | 1985-05-08 | 1987-05-12 | M&T Chemicals Inc. | Process for stripping nickel or nickel-alloy plating in a chromic acid solution |
US5071713A (en) * | 1988-03-17 | 1991-12-10 | N. V. Bekaert S.A. | Metal fibers obtained by bundled drawing |
US4968397A (en) * | 1989-11-27 | 1990-11-06 | Asher Reginald K | Non-cyanide electrode cleaning process |
USRE34227E (en) * | 1989-11-27 | 1993-04-20 | Motorola, Inc. | Non-cyanide electrode cleaning process |
US20110083972A1 (en) * | 2009-10-08 | 2011-04-14 | First Solar, Inc. | Electrochemical method and apparatus for removing coating from a substrate |
WO2011044340A1 (fr) * | 2009-10-08 | 2011-04-14 | First Solar, Inc. | Procédé électrochimique et appareil permettant d'éliminer un revêtement d'un substrat |
WO2016147709A1 (fr) * | 2015-03-13 | 2016-09-22 | 奥野製薬工業株式会社 | Agent de décapage électrolytique pour un gabarit |
JPWO2016147709A1 (ja) * | 2015-03-13 | 2017-04-27 | 奥野製薬工業株式会社 | 治具用電解剥離剤 |
US11649558B2 (en) | 2015-03-13 | 2023-05-16 | Okuno Chemical Industries Co., Ltd. | Electrolytic stripping agent for jig |
CN106367803A (zh) * | 2016-09-05 | 2017-02-01 | 上海瑞尔实业有限公司 | 一种塑料电镀挂具铜镍铬镀层剥离方法 |
Also Published As
Publication number | Publication date |
---|---|
DE2363352C3 (de) | 1980-12-11 |
DE2363352B2 (de) | 1980-04-17 |
DE2363352A1 (de) | 1975-10-02 |
FR2255397A1 (fr) | 1975-07-18 |
SE7415930L (fr) | 1975-06-23 |
GB1444699A (en) | 1976-08-04 |
IT1026066B (it) | 1978-09-20 |
FR2255397B1 (fr) | 1980-11-07 |
CH603833A5 (fr) | 1978-08-31 |
NL7416696A (nl) | 1975-06-24 |
BE823676A (fr) | 1975-06-20 |
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