US3537896A - Beneficial after-treatment of workpieces - Google Patents
Beneficial after-treatment of workpieces Download PDFInfo
- Publication number
- US3537896A US3537896A US761866A US3537896DA US3537896A US 3537896 A US3537896 A US 3537896A US 761866 A US761866 A US 761866A US 3537896D A US3537896D A US 3537896DA US 3537896 A US3537896 A US 3537896A
- Authority
- US
- United States
- Prior art keywords
- solution
- treatment
- reducing
- workpieces
- chemical
- 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
- 230000009286 beneficial effect Effects 0.000 title description 2
- 239000000243 solution Substances 0.000 description 69
- 239000000126 substance Substances 0.000 description 20
- 229910052751 metal Inorganic materials 0.000 description 18
- 239000002184 metal Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 15
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 12
- 239000011651 chromium Substances 0.000 description 12
- 229910052804 chromium Inorganic materials 0.000 description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 10
- 239000010949 copper Substances 0.000 description 10
- 230000006378 damage Effects 0.000 description 10
- 231100000331 toxic Toxicity 0.000 description 10
- 230000002588 toxic effect Effects 0.000 description 10
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 9
- 150000002736 metal compounds Chemical class 0.000 description 8
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 7
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 7
- 230000001376 precipitating effect Effects 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 229910052793 cadmium Inorganic materials 0.000 description 4
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 229910001369 Brass Inorganic materials 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000010951 brass Substances 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 150000001845 chromium compounds Chemical class 0.000 description 3
- 238000007739 conversion coating Methods 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- JJLJMEJHUUYSSY-UHFFFAOYSA-L Copper hydroxide Chemical class [OH-].[OH-].[Cu+2] JJLJMEJHUUYSSY-UHFFFAOYSA-L 0.000 description 2
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 2
- 229910001956 copper hydroxide Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 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
- OAKJQQAXSVQMHS-UHFFFAOYSA-N hydrazine Substances NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- -1 hydrazine chemical compound Chemical class 0.000 description 2
- 150000002429 hydrazines Chemical class 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 description 2
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000005749 Copper compound Substances 0.000 description 1
- 239000005750 Copper hydroxide Substances 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical class [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052728 basic metal Inorganic materials 0.000 description 1
- 150000003818 basic metals Chemical class 0.000 description 1
- GLPMHULIKFGNIJ-UHFFFAOYSA-N cadmium(2+);dioxido(dioxo)chromium Chemical compound [Cd+2].[O-][Cr]([O-])(=O)=O GLPMHULIKFGNIJ-UHFFFAOYSA-N 0.000 description 1
- 238000006757 chemical reactions by type Methods 0.000 description 1
- 231100000481 chemical toxicant Toxicity 0.000 description 1
- 238000007744 chromate conversion coating Methods 0.000 description 1
- 238000004532 chromating Methods 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 150000001880 copper compounds Chemical class 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000006193 liquid solution Substances 0.000 description 1
- CRGGPIWCSGOBDN-UHFFFAOYSA-N magnesium;dioxido(dioxo)chromium Chemical compound [Mg+2].[O-][Cr]([O-])(=O)=O CRGGPIWCSGOBDN-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- NDKWCCLKSWNDBG-UHFFFAOYSA-N zinc;dioxido(dioxo)chromium Chemical compound [Zn+2].[O-][Cr]([O-])(=O)=O NDKWCCLKSWNDBG-UHFFFAOYSA-N 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
Definitions
- after-treatment desirably first reduces higher valence soluble metal compounds, such as those of chromium or copper compounds to facilitate later precipitating out and settling the metals.
- Hydrazine hydrate is used in the reducing, after-treating solution.
- This invention relates to an improved method of reducing toxic chemical compounds that are carried over as a liquid film on workpieces that have been previously subjected to treatment in a chromium or copper ion containing surface treating solution bath.
- a phase of the invention deals with reducing soluble carry-over compounds to lower valences in such a manner as to enable acontinuous in-line treatment of workpieces, prevent damage to the surfaces of the workpieces, and better convert soluble metal compounds into insoluble compounds of relatively high density form to aid fast settling or precipitation of insoluble metals.
- U.S. Pat. No. 2,725,314 discloses a continuous in-line treatment for aqueous toxic carry-over or drag-out solutions, wherein such carry-over liquid may be continuously and effectively removed from or neutralized on the surfaces of workpieces during movement through treatment, wash and other baths.
- Another object of the invention has been to solve the problem involved in providing a reducing solution or chemical which will be effective in lowering the valency of copper and chrominum ions dissolved in a waste treatment solution and without imposing undesirable limitations on the process or damage to surfaces of the workpieces;
- a further object of the invention has been to enable an efficient and effective direct application of reducing treating solution to carry-over or drag-out liquid on a previously treated workpiece, without damage to the surface of the workpiece, and to facilitate precipitating or settling out of insoluble metal compounds therefrom;
- an after treatment solution containing about 2 g./l. of N H (3.13 ml. of a 64% solution concentrate) in a liter of treatment solution at a pH of 9.65 requires about one hour to completely reduce 250 mg. of CrO contained in a one ml. solution which was added to this after treatment solution.
- hydrazine hydrate in stoichiometric excess in the after or washing-treating solution it was discovered that dwell times in the process rinse of longer than 30 seconds, even up to 120 seconds, did not in any way adversely effect the corrosion resistance of a dichromate film on a zinc Plated surface.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US76186668A | 1968-09-23 | 1968-09-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3537896A true US3537896A (en) | 1970-11-03 |
Family
ID=25063457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US761866A Expired - Lifetime US3537896A (en) | 1968-09-23 | 1968-09-23 | Beneficial after-treatment of workpieces |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3537896A (de) |
| JP (1) | JPS4925536B1 (de) |
| CH (1) | CH516650A (de) |
| DE (1) | DE1924157B2 (de) |
| FR (1) | FR2018624A1 (de) |
| GB (1) | GB1202520A (de) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3960723A (en) * | 1972-12-26 | 1976-06-01 | Ford Motor Company | Magnetization of iron chromium system |
| US4268486A (en) * | 1979-07-02 | 1981-05-19 | Olin Corporation | Selective chromate removal from a chlorate solution |
| US5256306A (en) * | 1991-10-07 | 1993-10-26 | Griffin Gus M | Continuous treatment of chromium bearing waste water |
| CN100362142C (zh) * | 2005-09-09 | 2008-01-16 | 桂林工学院 | 电沉积铬废液中铬的回收与处理方法 |
| WO2012135594A1 (en) * | 2011-03-30 | 2012-10-04 | Battelle Memorial Institute | Formulations and methods to reduce hexavalent chrome contamination |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3770630A (en) * | 1971-09-02 | 1973-11-06 | Dart Ind Inc | Treatment of electroless process and stripping solutions |
| JPS5570286U (de) * | 1978-11-09 | 1980-05-14 | ||
| JPS5571591A (en) * | 1978-11-26 | 1980-05-29 | Maesato Kenji | Fountain pen tip with hole behind |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2725314A (en) * | 1952-01-29 | 1955-11-29 | Leslie E Lancy | In line treatment of toxic carry-over of work pieces |
| US3294680A (en) * | 1964-11-18 | 1966-12-27 | Lancy Lab | Treatment of spent cooling waters |
| US3391789A (en) * | 1965-06-11 | 1968-07-09 | Industrial Filter Pump Mfg Co | Waste treatment apparatus |
| US3475219A (en) * | 1966-07-12 | 1969-10-28 | Lancy Lab | Bright treatment for workpieces having toxic carryover |
-
1968
- 1968-09-23 US US761866A patent/US3537896A/en not_active Expired - Lifetime
-
1969
- 1969-04-14 GB GB09062/69A patent/GB1202520A/en not_active Expired
- 1969-05-12 DE DE19691924157 patent/DE1924157B2/de not_active Withdrawn
- 1969-05-16 CH CH750969A patent/CH516650A/de not_active IP Right Cessation
- 1969-06-16 JP JP44046921A patent/JPS4925536B1/ja active Pending
- 1969-08-29 FR FR6929763A patent/FR2018624A1/fr not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2725314A (en) * | 1952-01-29 | 1955-11-29 | Leslie E Lancy | In line treatment of toxic carry-over of work pieces |
| US3294680A (en) * | 1964-11-18 | 1966-12-27 | Lancy Lab | Treatment of spent cooling waters |
| US3391789A (en) * | 1965-06-11 | 1968-07-09 | Industrial Filter Pump Mfg Co | Waste treatment apparatus |
| US3475219A (en) * | 1966-07-12 | 1969-10-28 | Lancy Lab | Bright treatment for workpieces having toxic carryover |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3960723A (en) * | 1972-12-26 | 1976-06-01 | Ford Motor Company | Magnetization of iron chromium system |
| US4268486A (en) * | 1979-07-02 | 1981-05-19 | Olin Corporation | Selective chromate removal from a chlorate solution |
| US5256306A (en) * | 1991-10-07 | 1993-10-26 | Griffin Gus M | Continuous treatment of chromium bearing waste water |
| CN100362142C (zh) * | 2005-09-09 | 2008-01-16 | 桂林工学院 | 电沉积铬废液中铬的回收与处理方法 |
| WO2012135594A1 (en) * | 2011-03-30 | 2012-10-04 | Battelle Memorial Institute | Formulations and methods to reduce hexavalent chrome contamination |
| US20140023555A1 (en) * | 2011-03-30 | 2014-01-23 | Battelle Memorial Institute | Formulations and methods to reduce hexavalent chrome contamination |
| US9539456B2 (en) * | 2011-03-30 | 2017-01-10 | Battelle Memorial Institute | Formulations and methods to reduce hexavalent chrome contamination |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1924157B2 (de) | 1971-11-25 |
| FR2018624A1 (de) | 1970-06-26 |
| CH516650A (de) | 1971-12-15 |
| JPS4925536B1 (de) | 1974-07-01 |
| DE1924157A1 (de) | 1970-09-17 |
| GB1202520A (en) | 1970-08-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: LANCY INTERNATIONAL, INC., 525 WEST NEW CASTLE ST. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DART INDUSTRIES, INC., A CORP. OF DE;REEL/FRAME:004118/0651 Effective date: 19830131 |
|
| AS | Assignment |
Owner name: DOLLAR BANK FEDERAL SAVINGS BANK THREE GATEWAY CEN Free format text: SECURITY INTEREST;ASSIGNOR:LANCY INTERNATIONAL, INC.;REEL/FRAME:004485/0752 Effective date: 19851115 |