US20040194859A1 - Black hexavalent chromium-free plating treatment system - Google Patents

Black hexavalent chromium-free plating treatment system Download PDF

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Publication number
US20040194859A1
US20040194859A1 US10/783,680 US78368004A US2004194859A1 US 20040194859 A1 US20040194859 A1 US 20040194859A1 US 78368004 A US78368004 A US 78368004A US 2004194859 A1 US2004194859 A1 US 2004194859A1
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United States
Prior art keywords
metal part
black
coating
treatment step
treatment
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Abandoned
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US10/783,680
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English (en)
Inventor
Yoshitaka Asou
Yasuhiro Shikata
Toshio Shikata
Ryuichi Fujiwara
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Nitto Seiko Co Ltd
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Nitto Seiko Co Ltd
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Assigned to NITTO SEIKO CO., LTD. reassignment NITTO SEIKO CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ASOU, YOSHITAKA, FUJIWARA, RYUICHI, SHIKATA, TOSHIO, SHIKATA, YASUHIRO
Publication of US20040194859A1 publication Critical patent/US20040194859A1/en
Abandoned legal-status Critical Current

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    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • 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
    • C23C22/05—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 using aqueous solutions
    • C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/53—Treatment of zinc or alloys based thereon
    • 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
    • C23C22/73—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 characterised by the process
    • 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
    • C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
    • C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium

Definitions

  • the present invention relates to a black hexavalent chromium-free plating treatment system which is so designed that a corrosion resistance equal or similar to that of metal parts applied with hexavalent chromate treatment is maintained and environmental pollution is eliminate as much as possible not by application of conventional hexavalent chromate treatment, but by application of black trivalent chromate treatment to the surface of a metal part.
  • a method for preventing the surface of metal from corrosion is to apply zinc or zinc alloy plating to the surface of the base of a metal part to maintain the corrosion resistance.
  • a sufficient corrosion resistance cannot be achieved by only the plating and a treatment with chromic acid including hexavalent chromium, namely chromate treatment is usually carried out after the plating treatment.
  • chromate treatment is usually carried out after the plating treatment.
  • a prolonged contact of the human skin with the metal part treated with chromate including hexavalent chromium may cause the risk that the chromate is absorbed and accumulated in the body to cause chromium tumor, chromium allergy or the like.
  • JP-B No. 3,332,374 intends to obtain a treatment solution such that from the solution at a very low treatment concentration, a coating which contains no hexavalent chromium and which has a corrosion resistance equal or similar to that of conventional hexavalent chromium-containing coating can be formed on the surface of a metal base having thereon zinc or zinc alloy plating.
  • the invention also intends to obtain a method for forming a coating using the solution.
  • the invention provides a hexavalent chromium-free corrosion resistant trivalent chromate coating superior in hot corrosion resistance by forming a trivalent chromate coating containing a slightly soluble cobalt oxalate and Si on the surface of a metal base having thereon zinc plating deposited by use of a trivalent chromate treatment solution.
  • the object of the present invention is to provide a black trivalent chromate treatment which can yield plated products having a black trivalent chromate-treated coating superior in corrosion resistance and which has less bad influence on human bodies and the environment.
  • the surface of a metal part as a base is plated with zinc in a zinc plating treatment step 10 and the surface of the zinc-plated coating is activated in a treatment solution in a dilute nitric acid activation treatment step 11 . Then the activated metal part is rinsed, or is washed with water, so that nitric acid components are removed. Subsequently, a black coating is formed on the rinsed metal part in an inorganic salt solution containing trivalent chromium and iron components as main ingredients in a black chromate treatment step 20 .
  • the rerinsed black-coated metal part is subjected to a finish treatment by forming a conversion coating on the rerinsed metal part in a solution of inorganic salt and organic acid containing trivalent chromium and silica as main ingredients in a finish treatment step 30 .
  • the resulting metal part is dried in a drying step 34 .
  • a black trivalent chromate-treated coating is obtained which improves the corrosion resistance of the surface of the metal part.
  • the surface of a metal part as a base is plated with zinc in a zinc plating treatment step 10 and the surface of the zinc-plated coating is activated in a treatment solution in a dilute nitric acid activation treatment step 11 . Then the activated metal part is rinsed, so that nitric acid components are removed. Subsequently, a black regulation coating is formed on the rinsed metal part in a solution of inorganic salt and organic acid containing trivalent chromium and silica components as main ingredients in a chemical conversion treatment step 13 which is arranged next to the rinsing step.
  • a black coating is formed on the rinsed coated metal part in an inorganic salt solution containing trivalent chromium and iron components as main ingredients in a black chromate treatment step 20 .
  • the black coated metal part is rerinsed and then the rerinsed metal part is subjected to a finish treatment in a finish treatment step 30 by forming a conversion coating on the rerinsed metal part in a solution of inorganic salt and organic acid which contains trivalent chromium and silica as main ingredients and is less concentrated than the solution used in the foregoing conversion treatment step 13 .
  • the finished metal part is dried in a drying step 34 .
  • This procedure can also yield a black trivalent chromate-treated coating which improves the corrosion resistance of the surface of the metal part.
  • the aforementioned finish treatment step comprises an initial finish treatment step 31 in which a conversion coating is formed in a solution of inorganic salt and organic acid which contains trivalent chromium and silica as main ingredients and a final finish treatment step 33 in which after rinsing following the initial finish treatment, the rinsed metal part is immersed in any one of an overcoat treatment solution containing silica and cobalt as main ingredients and a water-soluble anti-corrosive solution.
  • an overcoat treatment solution containing silica and cobalt as main ingredients and a water-soluble anti-corrosive solution.
  • FIG. 1 is a treatment flow diagram of First Example showing one embodiment of the present invention.
  • FIG. 2 is an outside drawing of a screw obtained by the present invention.
  • FIG. 3 is a treatment flow diagram illustrating Second Example of the present invention.
  • FIG. 4 is a treatment flow diagram illustrating Third Example of the present invention.
  • FIG. 5 is a treatment flow diagram illustrating Fourth Example of the present invention.
  • FIG. 6 is a graph showing the relation of the quantity of zinc deposited with respect to the quantity of parts treated in the present invention.
  • FIG. 7 is a graph showing the relation between the quantity of zinc deposited and the time to the occurrence of corrosion according to the present invention.
  • FIG. 2 referential numeral 1 indicates a screw which is one example of the metal part for which the present invention is applied.
  • This screw 1 has a base made of iron-based material.
  • This screw has at its head a cross-shaped recess 3 with a tightening surface and on its shank 4 a thread 5 with a predetermined pitch, which are formed by a heading process and a rolling process, respectively.
  • the base has been zinc plated on its surface.
  • a black chromate-treated coating has been formed on the surface.
  • This coating has been formed by black trivalent chromate treatment for imparting heavy feeling as well as corrosion resistance, such as salt-water resistance and exposure resistance.
  • the black trivalent chromate coating 6 has less influence on the environment, such as vaporization of its ingredients at normal temperatures and their penetration into the ground, than hexavalent chromate coatings.
  • FIG. 1 illustrates First Example of the present invention.
  • referential numeral 10 indicates a zinc plating treatment step in which zinc plating is applied to the surface of the base of the metal part.
  • a dilute nitric acid activation treatment step 11 is arranged.
  • the nitric acid activation treatment step 11 the surface of the zinc-plated coating covering the surface of the base is activated, so that an oxide coating on the zinc-plated coating is removed.
  • the step 11 is followed by a rinsing step 12 , which is so designed that nitric acid components attached in the foregoing step are washed away with water.
  • a black chromate treatment step 20 is arranged. This step is so designed that the base from which nitric acid components have been washed away in the rinsing step 12 is subjected to an immersion treatment in an inorganic salt solution containing trivalent chromium and iron components as main ingredients, so that a black trivalent chromate coating 6 is formed on the zinc-plated coating.
  • a rinsing step 21 is arranged.
  • a finish treatment step 30 is arranged in order to improve the corrosion resistance of the black trivalent chromate coating 6 formed in the foregoing step.
  • the finish treatment step includes a solution of inorganic salt and organic acid containing trivalent chromium and silica as main ingredients.
  • a conversion coating is formed on the black trivalent chromate coating.
  • the base having thereon the black trivalent chromate coating on which the conversion coating has been formed is dried in a subsequent drying step 34 , thereby finalizing the production of a metal part with an improved corrosion resistance.
  • the base is first subjected to zinc plating.
  • the resultant is therefore transferred to a dilute nitric acid activation treatment step 11 and is immersed in the solution at normal temperature for a short period of time.
  • the oxide coating formed on the zinc-plated surface is activated and removed.
  • the zinc-plated coating is activated.
  • the treated base is subsequently rinsed, so that nitric acid components are removed.
  • the resulting base is then immersed, for a predetermined time, in a treatment solution for use in the black chromate treatment step 20 , the solution containing trivalent chromium and iron as main ingredients.
  • a black trivalent chromate coating 6 is formed.
  • the base is rinsed again for the purpose of washing away that solution.
  • the ingredients of the black chromate treatment solution are thereby removed and the resulting base is supplied to the next finish treatment step 30 for improving the corrosion resistance and is subjected to a finish treatment.
  • the base is dried in a drying step 34 to yield a product.
  • FIG. 3 illustrates Second Example, which includes a conversion treatment step 13 intervening between the dilute nitric acid activation treatment step 11 and the black chromate treatment step 20 in First Example.
  • the conversion treatment step 13 is arranged. This step is so designed that a black regulation coating is formed in a solution of inorganic salt and organic acid containing trivalent chromium and silica as main ingredients.
  • the treatment step 13 further precipitates and removes the zinc-plated coating formed on the base and simultaneously forms a conversion coating composed mainly of chromium and silica.
  • the conversion treatment step 13 also has a rinsing step 14 , after which the aforementioned black chromate treatment step 20 is arranged.
  • FIG. 4 shows Third Example in which the finish treatment step 30 is designed to be a two-step finish treatment including an initial finish treatment step 31 and a final finish treatment step 33 in place of the finish treatment step 30 in the treatment process shown in the First Example.
  • the initial finish treatment step 31 in this case is, like the finish treatment step 30 in the First and Second Examples described above, composed of a solution of inorganic salt and organic acid containing trivalent chromium and silica as main ingredients in order to improve the corrosion resistance of the black trivalent chromate coating formed in the foregoing step.
  • the initial finish treatment step 31 is so designed that a conversion coating is formed on a black trivalent chromate coating like the finish treatment step 30 in the foregoing Examples.
  • the initial finish treatment step 31 is also followed by a subsequent rinsing step 32 , so that the solution components coming from the initial finish treatment step 31 are washed away. Following this step, the final finish treatment step 33 is arranged.
  • the final finish treatment step 33 immersion in any one of an overcoat treatment solution containing silica and cobalt as main ingredients and a water-soluble anti-corrosive solution is carried out.
  • the surface of the black trivalent chromate coating treated in the initial finish treatment step 31 is provided with a coating thereon for enhancing the corrosion resistance of the initially-finished black trivalent chromate coating.
  • FIG. 5 illustrates Fourth Example in which the finish treatment step 30 is, like Example 3, designed to be a two-step finish treatment including an initial finish treatment step 31 and a final finish treatment step 33 in place of the finish treatment step 30 in the treatment process shown in the Second Example.
  • the details of the finish treatment are the same as those of the Third Example and, therefore, the explanation of the treatment is omitted here.
  • the Fourth Example is the best treatment process by which corrosion resistance can be demonstrated most effectively in the formation of a black trivalent chromate coating 6 .
  • Second and Fourth Examples a small quantity of zinc was deposited as indicated by “B”. That is, it is shown that the quantity of zinc deposited reached the standard deposition quantity (15 g/L) at a large quantity of items treated (16,000 dm 2 /L). Therefore, the solution in the tank is not required to be changed or replenished so frequently. Such a difference depends on whether a conversion treatment step 13 was conducted as a step prior to the black chromate treatment step. What Example should be chosen for the treatment of screws may be determined by taking the number of the steps contained in the process and the cost thereof.
  • FIG. 7 is a graph relates to the corrosion resistance in the black chromate treatment step 20 and demonstrates the relation between the quantity of zinc deposited (g/L) and the time to the occurrence of corrosion (H).
  • the items which were treated before the quantity of zinc deposited reached to the standard deposition quantity (15 g/L), required at least 100 hours before the formation of 5% of the white corrosion product in the salt spray test demonstrating their corrosion resistance.
  • the items with deposition quantities larger than the standard deposition quantity tend to require considerably short times before the formation of 5% of the white corrosion product. Setting the standard deposition quantity makes it possible to maintain the solution concentration for obtaining a desired corrosion resistance.
  • a black trivalent chromate coating formed by use of the present invention can have a corrosion resistance and strength equal or similar to those of conventional black hexavalent chromate coatings.
  • a black trivalent chromate coating with heavy feeling is obtained for the first time and the invention permits glossy black coatings to be formed.
  • the black trivalent chromate coating can sufficiently meet the environmental problems with lately increasing requirements and the reliability thereof is improved.
  • conducting the black trivalent chromate treatment through such a process will elongate the life of the solution used in the treatment step and will achieve an accurate control.
  • the coating is one which is made mainly of trivalent chromium, the amount of penetration into the ground will be reduced. Therefore, the probability of the occurrence of the soil pollution caused by the penetration of harmful substances into the ground is reduced and the influence on environmental pollution such as pollution of water source and penetration into plants is also reduced. Furthermore, because the finish treatment uses any one of an overcoat solution containing silica, cobalt and the like as main ingredients and a water-soluble anti-corrosive solution, it is possible to repair slight scratch marks formed in the former steps and unique effects such as improvement of quality of products can be obtained.

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  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
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  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
US10/783,680 2003-02-28 2004-02-20 Black hexavalent chromium-free plating treatment system Abandoned US20040194859A1 (en)

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JPP2003-54221 2003-02-28
JP2003054221A JP2004263240A (ja) 2003-02-28 2003-02-28 黒色六価クロムフリー鍍金処理システム

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1325747C (zh) * 2005-08-02 2007-07-11 河北华北石油荣盛机械制造有限公司 不锈钢油管接箍内螺纹表面处理方法及产品
WO2007082613A1 (de) * 2006-01-16 2007-07-26 Schaeffler Kg Chrom (vi)-frei zusammensetzung zum schutz einer verzinkte metalloberfläche vor korrosion, verfahren zu dessen herstellung sowie riemenscheibe
KR100783484B1 (ko) 2006-08-16 2007-12-07 윤은상 아연도금용 흑색 피막조성물 및 흑색 피막형성방법
EP1900945A1 (en) * 2005-06-13 2008-03-19 Saga Tekkohsho Co., Ltd Screw and screw fastening structure
WO2009028182A3 (en) * 2007-08-30 2009-06-25 Nissan Motor Chrome-plated part and manufacturing method of the same
TWI422418B (zh) * 2011-08-08 2014-01-11 Jung Hua Su The method and apparatus for the rapid separation of the extract from the module
CN104233251A (zh) * 2014-09-16 2014-12-24 朱忠良 一种镀锌层无铬钝化工艺
EP2848713A4 (en) * 2012-05-10 2016-02-10 Dipsol Chem METHOD OF REGENERATING A SOLUTION FOR THE SALT-ACIDIC ACID TREATMENT TREATMENT OF THE SURFACE OF A ZINCED METAL ELEMENT AND A REGENERATION TREATMENT DEVICE THEREWITH

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102627860B1 (ko) * 2023-08-24 2024-01-23 (주)엠피피티 내식성이 우수한 전기아연도금 금속용 크로메이트 및 코팅 처리방법

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4174265A (en) * 1975-11-11 1979-11-13 Tomoya Minegishi Black chromium electroplating process
US4243434A (en) * 1978-05-30 1981-01-06 Rocol Limited Composition for coating metal-working tools
US4263059A (en) * 1979-12-21 1981-04-21 Rohco, Inc. Coating solutions of trivalent chromium for coating zinc and cadmium surfaces
US4578122A (en) * 1984-11-14 1986-03-25 Omi International Corporation Non-peroxide trivalent chromium passivate composition and process
US5368655A (en) * 1992-10-23 1994-11-29 Alchem Corp. Process for chromating surfaces of zinc, cadmium and alloys thereof
US5393353A (en) * 1993-09-16 1995-02-28 Mcgean-Rohco, Inc. Chromium-free black zinc-nickel alloy surfaces
US5407749A (en) * 1993-10-07 1995-04-18 Mcgean-Rohco, Inc. Iridescent chromium coatings and method
US5415702A (en) * 1993-09-02 1995-05-16 Mcgean-Rohco, Inc. Black chromium-containing conversion coatings on zinc-nickel and zinc-iron alloys
US5566011A (en) * 1994-12-08 1996-10-15 Luncent Technologies Inc. Antiflector black matrix having successively a chromium oxide layer, a molybdenum layer and a second chromium oxide layer
US5704995A (en) * 1996-07-16 1998-01-06 Globe Motors, A Division Of Labinal Components And Systems, Inc. Method for forming a black, adherent coating on a metal substrate
US6287704B1 (en) * 1996-04-19 2001-09-11 Surtec Produkte Und System Fur Die Oberflachenbehandlung Gmbh Chromate-free conversion layer and process for producing the same
US6719852B2 (en) * 2001-11-30 2004-04-13 Dipsol Chemicals Co., Ltd. Processing solution for forming hexavalent chromium free and corrosion resistant conversion film on zinc or zinc alloy plating layers, hexavalent chromium free and corrosion resistant conversion film and method for forming the same

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4174265A (en) * 1975-11-11 1979-11-13 Tomoya Minegishi Black chromium electroplating process
US4243434A (en) * 1978-05-30 1981-01-06 Rocol Limited Composition for coating metal-working tools
US4263059A (en) * 1979-12-21 1981-04-21 Rohco, Inc. Coating solutions of trivalent chromium for coating zinc and cadmium surfaces
US4578122A (en) * 1984-11-14 1986-03-25 Omi International Corporation Non-peroxide trivalent chromium passivate composition and process
US5368655A (en) * 1992-10-23 1994-11-29 Alchem Corp. Process for chromating surfaces of zinc, cadmium and alloys thereof
US5415702A (en) * 1993-09-02 1995-05-16 Mcgean-Rohco, Inc. Black chromium-containing conversion coatings on zinc-nickel and zinc-iron alloys
US5393353A (en) * 1993-09-16 1995-02-28 Mcgean-Rohco, Inc. Chromium-free black zinc-nickel alloy surfaces
US5407749A (en) * 1993-10-07 1995-04-18 Mcgean-Rohco, Inc. Iridescent chromium coatings and method
US5566011A (en) * 1994-12-08 1996-10-15 Luncent Technologies Inc. Antiflector black matrix having successively a chromium oxide layer, a molybdenum layer and a second chromium oxide layer
US6287704B1 (en) * 1996-04-19 2001-09-11 Surtec Produkte Und System Fur Die Oberflachenbehandlung Gmbh Chromate-free conversion layer and process for producing the same
US5704995A (en) * 1996-07-16 1998-01-06 Globe Motors, A Division Of Labinal Components And Systems, Inc. Method for forming a black, adherent coating on a metal substrate
US6719852B2 (en) * 2001-11-30 2004-04-13 Dipsol Chemicals Co., Ltd. Processing solution for forming hexavalent chromium free and corrosion resistant conversion film on zinc or zinc alloy plating layers, hexavalent chromium free and corrosion resistant conversion film and method for forming the same

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1900945A4 (en) * 2005-06-13 2010-06-30 Saga Tekkohsho Co Ltd SCREWS AND SCREW CLOSURE STRUCTURE
EP1900945A1 (en) * 2005-06-13 2008-03-19 Saga Tekkohsho Co., Ltd Screw and screw fastening structure
US7976258B2 (en) 2005-06-13 2011-07-12 Saga Tekkohsho Co., Ltd. Screw and screw fastening structure
CN1325747C (zh) * 2005-08-02 2007-07-11 河北华北石油荣盛机械制造有限公司 不锈钢油管接箍内螺纹表面处理方法及产品
WO2007082613A1 (de) * 2006-01-16 2007-07-26 Schaeffler Kg Chrom (vi)-frei zusammensetzung zum schutz einer verzinkte metalloberfläche vor korrosion, verfahren zu dessen herstellung sowie riemenscheibe
US20100160102A1 (en) * 2006-01-16 2010-06-24 Schaeffler Kg Chromium(vi)-free composition for protection of a galvanized metal surface against corrosion, process for producing it and pulley
KR100783484B1 (ko) 2006-08-16 2007-12-07 윤은상 아연도금용 흑색 피막조성물 및 흑색 피막형성방법
WO2009028182A3 (en) * 2007-08-30 2009-06-25 Nissan Motor Chrome-plated part and manufacturing method of the same
US20110117380A1 (en) * 2007-08-30 2011-05-19 Nissan Motor Co., Ltd. Chrome-plated part and manufacturing method of the same
US9650722B2 (en) 2007-08-30 2017-05-16 Nissan Motor Co., Ltd. Chrome-plated part and manufacturing method of the same
TWI422418B (zh) * 2011-08-08 2014-01-11 Jung Hua Su The method and apparatus for the rapid separation of the extract from the module
EP2848713A4 (en) * 2012-05-10 2016-02-10 Dipsol Chem METHOD OF REGENERATING A SOLUTION FOR THE SALT-ACIDIC ACID TREATMENT TREATMENT OF THE SURFACE OF A ZINCED METAL ELEMENT AND A REGENERATION TREATMENT DEVICE THEREWITH
CN104233251A (zh) * 2014-09-16 2014-12-24 朱忠良 一种镀锌层无铬钝化工艺

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