US3542658A - Electrolytic bath containing ammonium nitrate and a phenol - Google Patents
Electrolytic bath containing ammonium nitrate and a phenol Download PDFInfo
- Publication number
- US3542658A US3542658A US722554A US3542658DA US3542658A US 3542658 A US3542658 A US 3542658A US 722554 A US722554 A US 722554A US 3542658D A US3542658D A US 3542658DA US 3542658 A US3542658 A US 3542658A
- Authority
- US
- United States
- Prior art keywords
- phenol
- stripping
- bath
- ammonium nitrate
- grams
- 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
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 title description 53
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 title description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 50
- 229910052759 nickel Inorganic materials 0.000 description 25
- 238000000576 coating method Methods 0.000 description 24
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 19
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 229910052799 carbon Inorganic materials 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 12
- 239000000243 solution Substances 0.000 description 11
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid group Chemical class S(O)(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 7
- 229910017604 nitric acid Inorganic materials 0.000 description 7
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 6
- 239000010953 base metal Substances 0.000 description 6
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 6
- WQGWDDDVZFFDIG-UHFFFAOYSA-N pyrogallol Chemical compound OC1=CC=CC(O)=C1O WQGWDDDVZFFDIG-UHFFFAOYSA-N 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 5
- 229910000746 Structural steel Inorganic materials 0.000 description 5
- -1 alkali metal salt Chemical class 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 239000001632 sodium acetate Substances 0.000 description 5
- 235000017281 sodium acetate Nutrition 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Inorganic materials [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 4
- IQUPABOKLQSFBK-UHFFFAOYSA-N 2-nitrophenol Chemical compound OC1=CC=CC=C1[N+]([O-])=O IQUPABOKLQSFBK-UHFFFAOYSA-N 0.000 description 3
- JPYHHZQJCSQRJY-UHFFFAOYSA-N Phloroglucinol Natural products CCC=CCC=CCC=CCC=CCCCCC(=O)C1=C(O)C=C(O)C=C1O JPYHHZQJCSQRJY-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- GGNQRNBDZQJCCN-UHFFFAOYSA-N benzene-1,2,4-triol Chemical compound OC1=CC=C(O)C(O)=C1 GGNQRNBDZQJCCN-UHFFFAOYSA-N 0.000 description 3
- 150000002989 phenols Chemical class 0.000 description 3
- QCDYQQDYXPDABM-UHFFFAOYSA-N phloroglucinol Chemical compound OC1=CC(O)=CC(O)=C1 QCDYQQDYXPDABM-UHFFFAOYSA-N 0.000 description 3
- 229960001553 phloroglucinol Drugs 0.000 description 3
- 239000004323 potassium nitrate Substances 0.000 description 3
- 235000010333 potassium nitrate Nutrition 0.000 description 3
- 229940079877 pyrogallol Drugs 0.000 description 3
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 3
- 239000001509 sodium citrate Substances 0.000 description 3
- 239000004317 sodium nitrate Substances 0.000 description 3
- 235000010344 sodium nitrate Nutrition 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UFBJCMHMOXMLKC-UHFFFAOYSA-N 2,4-dinitrophenol Chemical compound OC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O UFBJCMHMOXMLKC-UHFFFAOYSA-N 0.000 description 2
- YHKWFDPEASWKFQ-UHFFFAOYSA-N 3-nitrobenzene-1,2-diol Chemical compound OC1=CC=CC([N+]([O-])=O)=C1O YHKWFDPEASWKFQ-UHFFFAOYSA-N 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 2
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 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 2
- 229960004337 hydroquinone Drugs 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 150000007522 mineralic acids Chemical class 0.000 description 2
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 229960001755 resorcinol Drugs 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000008351 acetate buffer Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910001963 alkali metal nitrate Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PRORZGWHZXZQMV-UHFFFAOYSA-N azane;nitric acid Chemical compound N.O[N+]([O-])=O PRORZGWHZXZQMV-UHFFFAOYSA-N 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000007979 citrate buffer Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930192878 garvin Natural products 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000009423 ventilation Methods 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
- C25F5/00—Electrolytic stripping of metallic layers or coatings
Definitions
- the phenol is consumed during the course of the stripping and the invention contemplates replenishing it in order to maintain the concentration between the level of 1-20 grams per liter.
- 800 grams of phenol may be needed during the stripping of one kilogram of semilustrous nickel or of mat nickel coating.
- This invention relates to a novel electrolytic stripping bath for the removal of galvanic coatings or deposits, such as nickel coatings, from ferrous metal articles, the bath comprising, as its sole stripping component, a major proportion of an aqueous solution of ammonium ni trate (on a dry chemical basis) and a minor but critical proportion of a water-soluble phenol which serves as the sole accelerator for the stripping of the metal coating by the ammonium nitrate.
- the invention also relates to a new method of stripping metal coatings, especially nickel coatings, from ferrous metal articles wherein a ferrous metal article having a nickel coating is immersed in the stripping bath containing as its essential stripping ingredient, an aqueous solution of from 50-400 grams of ammonium nitrate per liter of solution and from about lgrams per liter of a water-soluble phenol serving as the accelerator for the stripping action of the ammonium nitrate solution, 0
- a pH bulfer consisting of the alkali metal salt of an organic acid, e.g. sodium acetate or sodium citrate, in an amount to maintain the pH at between 4 and 6 during the passage of direct current through the stripping bath.
- an organic acid e.g. sodium acetate or sodium citrate
- the ferrous metal article having the nickel coating is placed in the stripping bath which is held in a corrosion resistant tank, and the ferrous metal article connected as the anode to the electrolytic stripping apparatus employing a stainless steel plate as the cathode. Rapid and complete stripping occurs at temperatures of from 20 100 C., preferably -60 C., at a current density of 8 amperes per square decimeter as the minimum density up to about 36 amperes per square decimeter as a desirable top limit of current density.
- Stripping baths containing concentrated sulfuric acid at 52 to 56 Beaum are slow in their action and, when accelerated with catalytic agents, result in attack by the acid on the base metal.
- Alkali metal nitrate baths such as sodium or potassium nitrate, have been used to avoid the attack on the base metal, but these are unsatisfactory because they are no faster than the sulfuric acid bath.
- potassium nitrate and sodium nitrate have the additional disadvantage of setting free hydroxide during the stripping process, this hydroxide forming a slush which renders the stripping bath unusable in a relatively short period of time.
- a stripping bath based upon ammonium nitrate as the sole stripping agent has the advantage of avoiding the slush buildup, but is nevertheless extremely slow in its stripping action and also tends to corrode the ferrous base metal, especially alloy steels and ordinary steels with carbon content greater than 0.1%.
- the current densities of ammonium nitrate stripping solutions vary from 108 amperes per square foot, which is about 11.6 amperes per square decimeter, up to 475 amperes per square foot, which is 51.1 amperes per square decimeter, the higher current densities demanding higher voltages and producing more rapid stripping, and the lower current densities permitting undesirable etching of the ferrous base metal.
- sulfates did not detract from the efliciency of their stripping method if a nitrogen base were present, such as guanidine, diethanolamine, trimethyl amine, ethylene diamine, urea, aniline etc., in an amount of at least 50 grams per liter and at a pH of about 3 to 6.
- a nitrogen base such as guanidine, diethanolamine, trimethyl amine, ethylene diamine, urea, aniline etc.
- the present invention distinguishes over the teaching of Bell et al., US. Pat. 2,549,411, in the employment of a water-soluble phenol selected from the group consisting of phenol, pyrocatechol, resorcinol, hydroquinone, pyrogallol, phloroglucinol, oxyhydroquinone, nitrophenol, nitropyrocatechol and dinitrophenol, which serves as the sole accelerator of stripping at low current densities in the range of from 8 amperes per square decimeter to about 36 amperes per square decimeter.
- a water-soluble phenol selected from the group consisting of phenol, pyrocatechol, resorcinol, hydroquinone, pyrogallol, phloroglucinol, oxyhydroquinone, nitrophenol, nitropyrocatechol and dinitrophenol
- a low-carbon stripping bath need contain only ammonium nitrate and phenol, the preferred amounts being 200 grams of ammonium nitrate and 5 cubic centimeters of the phenol, the preferred phenol being phenol.
- the density of pure phenol is 1.07 grams per milliliter.
- the water-soluble phenols other than phenol itself are each measured in grams, while phenol is most conveniently liquefied by heating to above 41 C. and is measured in cubic centimeters.
- An object of the invention is to provide a stripping bath which is free from nonvolatile, inorganic acid such as sulfuric acid or chromic acid but which is adapted for rapid and complete electrolytic stripping of a nickel coating from ferrous articles of complex shapes, without attacking or etching the ferrous base.
- Another object is to provide an aqueous solution of ammonium nitrate as the sole stripping component with a water-soluble phenol as the accelerator for the stripping action, which solution is acidified to a pH of 4-6 with nitric acid, the proportions of the phenol being maintained between 1 and 20 grams per liter by replenishing during usage and being particularly adapted for stripping low-carbon steels.
- a solution is prepared containing 200 grams of ammonia nitrate, 2 cc. of phenol measured when melted to 45 C. and 100 grams of sodium acetate in 1 liter of water.
- a high carbon steel angle-iron (more than 0.1% carbon) which bears a semi-lustrous nickel coating in a thickness of .0008 inch is submerged in the solution constituting the bath in a corrosion-resistant tank formed of molded synthetic resin, such as polystyrene or polyethylene.
- the bath is maintained at 45 C.
- the angle-iron is made the anode and a stainless steel plate is used as the cathode.
- the pH of the bath is adjusted to four by adding nitric acid.
- a current density of 8 amperes per square decimeter is applied and the nickel coating is completely stripped from the angle-iron in about 10 minutes, leaving the angle-iron bright and in condition to be replated without repolishing.
- EXAMPLE II instead of using a high-carbon ferrous base as in Example I, a low-carbon angle-iron (less than 0.1% carbon) coated with nickel having a thickness of .00125 inch is stripped in 20 minutes using a bath solution consisting of 200 grams of ammonium nitrate and cc. of phenol per liter of water, the solution being adjusted to pH 4 with nitric acid and being free of buffer, such as sodium acetate or sodium citrate.
- a bath solution consisting of 200 grams of ammonium nitrate and cc. of phenol per liter of water, the solution being adjusted to pH 4 with nitric acid and being free of buffer, such as sodium acetate or sodium citrate.
- Example I illustrates a bath which is particularly useful for stripping ferrous metals with a carbon content greater than 0.1%.
- Example II illustrates a bath useful for stripping ferrous metals with a carbon content less than 0.1%.
- the stripping rate becomes so slow as to make the process impractical. Raising the current density up to about 36 amperes per square decimeter tends to cause loss of the stripping solution and requires higher voltages so as to increase operating costs, but stripping can be hastened. It is preferred to carry out the stripping operation at lower cost keeping in mind that phenol is consumed and required replenishment. Operating at higher current densities increases the temperature of the bath making the replenishment with phenol more diflicult.
- the dihydric phenols such as resorcinol may be used, or the trihydric phenols such as pyrogallol may be used, these being less volatile and odorous than phenol.
- the advantages of low cost and simplicity of operation with phenol can outweigh the disadvantages of odor and volatility in installations provided with good ventilation.
- Example I If the phenol accelerator in Example I is eliminated, the semi-lustrous nickel coating is not completely removed, even after 24 hours. Therefore, the effect of the phenol is to accelerate stripping from a time period of about a day to about -20 minutes, as shown in Examples I and II.
- the present composition serves as a universal solution for electrolytic stripping of nickel coatings from ferrous metal articles, whether of high or low carbon content.
- the stripping bath of the present invention is useful not only for removing nickel coatings from a ferrous base, but also may be used for stripping any non-ferrous coating, such as chromium, cobalt and the like.
- An aqueous electrolytic stripping bath to remove nickel coatings from ferrous metal articles comprising ammonium nitrate as the sole stripping component in an amount of from 50-400 grams per liter and a water-soluble phenol having from 1 to 3 hydroxyl groups and no other functional group than the nitro group as the sole accelerator in an amount of from l-20 grams per liter, said bath being acidified with nitric acid to a pH of between 4 and 6 and being adapted to completely strip the nickel coating at a current density of at least 8 amperes per square decimeter and at a temperature of 20-l00 C.
- a bath as claimed in claim 1 wherein said watersoluble phenol is selected from the group consisting of phenol, pyrocatechol, resorcinol, hydroquinone, pyrogallol, phloroglucinol, oxyhydroquinone, nitrophenol, nitropyrcatechol and dinitrophenol.
- the process which comprises inserting a ferrous metal article coated with nickel in a stripping bath and passing an electric current from said article, serving as anode. to a cathode, said stripping bath consisting essentially of an aqueous solution of ammonium nitrate, as the sole stripping component, in an amount of from 50-400 grams per liter and a water soluble phenol having from 1 to 3 hydroxyl groups and no other functional group than the nitro group, as the sole accelerator, in an amount of from l-20 grams per liter, said bath being acidified with nitric acid to a pH of between 4 and 6 and being adapted to completely strip the nickel coating at a current density of at least 8 amperes per square decimeter and at a temperature of 20l00 C.
- a process as claimed in claim 3 wherein said watersoluble phenol is phenol which is continuously added during the course of the stripping process to maintain the level of phenol in the solution at a value of at least about 2 cubic centimeters of phenol per lliter of water making up the bath, there being consumed an amount of said phenol during stripping to require about 800 cubic centimeters of phenol for each kilogram of nickel which is stripped.
- a process as claimed in claim 3 wherein said Watersoluble phenol is phenol which is present in an amount of 2 cubic centimeters per liter of water in the bath and said stripping bath contains about 200 grams of ammonium nitrate and about grams of sodium acetate.
- a process as claimed in claim 3 wherein said watersoluble phenol is phenol which is present in an amount of about 5 cubic centimeters per liter of water in the bath and said stripping bath contains about 200 grams of ammonium nitrate which adapts the bath, free from acetate 6 or citrate, for the stripping of nickel from low-carbon References Cited steel containing less than 0.1% carbon.
- UNITED STATES PATENTS 7 A process as claimed in claim 3 wherein said watersoluble phenol is selected from the group consisting of 2,549,411 4/1951 Bell et a1 204-146 phenol, pyrocatechol, resorcinol, hydroquinone, pyrogal- 6 ,93 5/ 1960 WeiSberg et a1. 204-446 101, phloroglucinol, oxyhydroquinone, nitrophenol, nitropyrocatechol, and dinitm he L PATRICK GARVIN, Primary Examiner
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)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- ing And Chemical Polishing (AREA)
- Paints Or Removers (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB92263A DE1281217B (de) | 1967-04-27 | 1967-04-27 | Bad zum elektrolytischen Abloesen galvanischer Niederschlaege von eisenhaltigen Grundkoerpern |
| DEB95716A DE1301185B (de) | 1967-04-27 | 1967-12-06 | Bad zum elektrolytischen Abloesen galvanischer Niederschlaege von eisenhaltigen Grundkoerpern |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3542658A true US3542658A (en) | 1970-11-24 |
Family
ID=25968312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US722554A Expired - Lifetime US3542658A (en) | 1967-04-27 | 1968-04-19 | Electrolytic bath containing ammonium nitrate and a phenol |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3542658A (cs) |
| AT (1) | AT275991B (cs) |
| BE (1) | BE713896A (cs) |
| BR (1) | BR6898611D0 (cs) |
| CH (1) | CH499626A (cs) |
| DE (2) | DE1281217B (cs) |
| FR (1) | FR1561701A (cs) |
| GB (1) | GB1169498A (cs) |
| NL (1) | NL6805158A (cs) |
| SE (1) | SE334518B (cs) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3619390A (en) * | 1969-02-21 | 1971-11-09 | Horst Dillenberg | Aqueous electrolytic stripping bath to remove metal coatings from bases of steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2549411A (en) * | 1946-12-06 | 1951-04-17 | Henderson M Bell | Electrolytic stripping of nickel coatings from ferrous metals |
| US2937940A (en) * | 1957-07-01 | 1960-05-24 | Eltex Chemical Corp | Selective stripping of electroplated metals |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB336532A (en) * | 1929-03-06 | 1930-10-16 | Ternstedt Mfg Co | Improved method and means for stripping chromium plating |
| DE825597C (de) * | 1950-09-14 | 1951-12-20 | Collardin Gmbh Gerhard | Verfahren zum anodischen Entnickeln |
-
1967
- 1967-04-27 DE DEB92263A patent/DE1281217B/de active Pending
- 1967-12-06 DE DEB95716A patent/DE1301185B/de not_active Withdrawn
-
1968
- 1968-04-04 AT AT329068A patent/AT275991B/de active
- 1968-04-11 NL NL6805158A patent/NL6805158A/xx unknown
- 1968-04-18 GB GB08343/68A patent/GB1169498A/en not_active Expired
- 1968-04-19 BE BE713896D patent/BE713896A/xx unknown
- 1968-04-19 US US722554A patent/US3542658A/en not_active Expired - Lifetime
- 1968-04-19 FR FR1561701D patent/FR1561701A/fr not_active Expired
- 1968-04-25 BR BR198611/68A patent/BR6898611D0/pt unknown
- 1968-04-25 CH CH613068A patent/CH499626A/de not_active IP Right Cessation
- 1968-04-26 SE SE05675/68A patent/SE334518B/xx unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2549411A (en) * | 1946-12-06 | 1951-04-17 | Henderson M Bell | Electrolytic stripping of nickel coatings from ferrous metals |
| US2937940A (en) * | 1957-07-01 | 1960-05-24 | Eltex Chemical Corp | Selective stripping of electroplated metals |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3619390A (en) * | 1969-02-21 | 1971-11-09 | Horst Dillenberg | Aqueous electrolytic stripping bath to remove metal coatings from bases of steel |
Also Published As
| Publication number | Publication date |
|---|---|
| NL6805158A (cs) | 1968-10-28 |
| BR6898611D0 (pt) | 1973-01-09 |
| BE713896A (cs) | 1968-09-16 |
| AT275991B (de) | 1969-11-10 |
| GB1169498A (en) | 1969-11-05 |
| DE1281217B (de) | 1968-10-24 |
| FR1561701A (cs) | 1969-03-28 |
| CH499626A (de) | 1970-11-30 |
| SE334518B (cs) | 1971-04-26 |
| DE1301185B (de) | 1969-08-14 |
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