US3501278A - Process for electrodeposition of paint coatings on zinc-plated steel sheet - Google Patents

Process for electrodeposition of paint coatings on zinc-plated steel sheet Download PDF

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Publication number
US3501278A
US3501278A US717293A US3501278DA US3501278A US 3501278 A US3501278 A US 3501278A US 717293 A US717293 A US 717293A US 3501278D A US3501278D A US 3501278DA US 3501278 A US3501278 A US 3501278A
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US
United States
Prior art keywords
zinc
coating
electrodeposition
paint
plated
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
Application number
US717293A
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English (en)
Inventor
Hiromu Uchida
Hajime Nagino
Kunihiko Yokoyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Iron and Steel Co Ltd
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Fuji Iron and Steel Co Ltd
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Publication date
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/20—Pretreatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9335—Product by special process
    • Y10S428/934—Electrical process
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12556—Organic component
    • Y10T428/12569—Synthetic resin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y10T428/12792—Zn-base component
    • Y10T428/12799—Next to Fe-base component [e.g., galvanized]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12806—Refractory [Group IVB, VB, or VIB] metal-base component
    • Y10T428/12826—Group VIB metal-base component
    • Y10T428/12847—Cr-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31511—Of epoxy ether
    • Y10T428/31529—Next to metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31681—Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31692—Next to addition polymer from unsaturated monomers

Definitions

  • the zinc-plated steel products of the present invention have about 0.2 g./m. or more of zinc plated thereon.
  • the coating Weight throughout the specification and claims is shown as that on one side of the material.
  • the electrodeposition paint-coating process is a paint-coating process whereby coating material such as that of epoxy type, acrylic type, phenolic type, alkyd type, etc., dispersed or dissolved in an electro paint-coating solution, is electrodeposited on an article or product, e.g., zinc-plated steel.
  • the article to be coated is placed in the solution or dispersion of the paint, using the article as anode with direct current passed thereto. This causes paint particles to adhere onto the article by electrophoresis.
  • the above objects are attained by applying a chromium plating to zinc-plated steel products for a short period of time, prior to the electrodeposition of the paint coating.
  • Zinc plating and chromium plating in the present invention can be by any of the methods conventionally known.
  • the steel products should be washed with water after zinc plating and the chromium plating should preferably be done immediately thereafter. It is desirous to send the chromium plated steel sheet to the paint electrodeposition tank after water rinsing without drying the plated material. By doing so, the chromium-plated material can be paint coated by electrodeposition while it still preserves its chemically active state. This provides good adhesion of the paint coating and results in good corrosion resistance and workability.
  • the product obtained by the present invention has such advantages that red rusting is satisfactorily prevented because even when the coated film of paint is damaged the steel surface is protected by the zinc existing as underlaying film.
  • FIG. 1 is a diagram showing the relationship between the electrodeposition time and the thickness of electrodeposited paint coating film when the electrodeposition coating is given to various materials.
  • FIG. 2 is a diagram showing the relationship between tht zinc coating weight and corrosion resistance of zinc-plated steel sheet with electrodeposition paint coating.
  • Table 1 shows the amount of zinc dissolved from the zinc plating into the aqueous electrodeposition paint solution from steel which had been zinc plated and then chromium plated, and from steel which had been zinc plated and then chemically treated.
  • Bonderite #37 (commercial name, available from Hooker Chemical Corp.) is used.
  • Epoxy type electrodeposition coating material is used. Voltage9 v. Time3 minutes. Coating temperature-35 C.
  • Electro galvanized steel sheet (zinc coating weight, 18 g./m. X 3.1 X X X X Electro galvanized steel sheet with chromate treatment applied thereon (zinc coating weight, same as above) A 7. 3 A X X X Electro galvanized steel sheet with phosphate treatment applied thereon (zinc coating weight, same as above) 7. 8 0 A A X Electro galvanized steel sheet with chromium plating applied thereon:
  • Zine coating Weight 18 g./m. chromium coating weight, 1.0 mg. ldm. 8.0 O O O 0 Zinc coating weight, 18 g./m. chromium coating weight, 1.5 mg/dm. 8.0 0 O 0 O Zinc coating weight, 18 g./m. chromium coating weight, 2.0 mg./dm. 8.0 0 0 O O Zinc coating weight, 18 g./m. chromium coating weight, 4.0 mg dm. O 8.0 O O O O Zinc coating weight, 18 gJmfi; chromium coating weight, 6.0 mg. ldrn. O 8.
  • test pieces were drawn 8 mm. deep with an Erichsen tester and peeling ofi of the organic coating was observed.
  • Thickness of steel sheet 0.8 mm.
  • the baking after electro coating was done for 25 minutes in an electric furnace at 160" C.
  • FIG. 1 shows the relationship between the electrodeposition time and the thickness of elec-
  • the above table shows that the amount of chromium plated, about 1.5 mg./dm. or more is desirous.
  • the maximum amount of chromium plated should be about 7 mg/drn. from a standpoint of workability. More than 7 m n/dm. of chromium coating cracks when it is bent or drawn.
  • the amount of zinc plated it may be such amount as ordinarily used in conventional zinc-plated steel sheet, that is about 9 g./m. to g./m on electrogalvanized steel sheet and about 30 g./m. to 230 g./m. on galvanized steel sheet (both one side), but it can be such amount as far less than those, that is, about 0.2 g./rn.
  • the zinc plated in an amount smaller than that will result in inferior corrosion resistance, as shown in FIG. 2.
  • FIG. 2 shows red rust formation time on the cross-cut portions of steel sheets having ditferent amount of zinc plated thereon, with a certain amount of chromium plating and electrodeposition paint coating thereon, which were cross-cut on the surface and was salt Water sprayed.
  • FIG. 2 indicates that when the amount of Zinc plated is more than about 0.2 g./rn. the corrosion resistance after electrodeposition coating is good.
  • the steel sheet which has more than 0.2 g./m. of zinc plated thereonto and 1.5 to 7.0 mg/dm. of chromium plated thereover and then is subjected to electro-deposition coating, has excellent paint coating adhesion, corrosion resistance and workability.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US717293A 1967-04-03 1968-03-29 Process for electrodeposition of paint coatings on zinc-plated steel sheet Expired - Lifetime US3501278A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP42021103A JPS4829296B1 (enrdf_load_stackoverflow) 1967-04-03 1967-04-03

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US3501278A true US3501278A (en) 1970-03-17

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JP (1) JPS4829296B1 (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816082A (en) * 1969-04-21 1974-06-11 Nat Steel Corp Method of improving the corrosion resistance of zinc coated ferrous metal substrates and the corrosion resistant substrates thus produced
US3928157A (en) * 1972-05-15 1975-12-23 Shinto Paint Co Ltd Cathodic treatment of chromium-plated surfaces
US4437944A (en) 1980-07-28 1984-03-20 Zincroksid S.P.A. Process of making long-life thin metal plate for automobile bodies
GB2266895B (en) * 1992-05-15 1996-12-04 Wednesbury Diecasting And Meta Improvements relating to electrophoretic coatings
US5707505A (en) * 1988-09-29 1998-01-13 Gesellschaft fur Technische Studien Entwicklung Planung mbH Method for the electrophoretic dip coating of chromatizable metal surfaces
US20050104488A1 (en) * 2003-11-14 2005-05-19 Hunt Stacy A. Dishwaser with electrocoated dish rack

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1827204A (en) * 1927-10-18 1931-10-13 Western Electric Co Method of protecting metal surfaces
US2412543A (en) * 1941-07-03 1946-12-10 Parker Rust Proof Co Coated zinc article and method of making same
US2802897A (en) * 1952-07-18 1957-08-13 Gen Electric Insulated electrical conductors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1827204A (en) * 1927-10-18 1931-10-13 Western Electric Co Method of protecting metal surfaces
US2412543A (en) * 1941-07-03 1946-12-10 Parker Rust Proof Co Coated zinc article and method of making same
US2802897A (en) * 1952-07-18 1957-08-13 Gen Electric Insulated electrical conductors

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816082A (en) * 1969-04-21 1974-06-11 Nat Steel Corp Method of improving the corrosion resistance of zinc coated ferrous metal substrates and the corrosion resistant substrates thus produced
US3928157A (en) * 1972-05-15 1975-12-23 Shinto Paint Co Ltd Cathodic treatment of chromium-plated surfaces
US4437944A (en) 1980-07-28 1984-03-20 Zincroksid S.P.A. Process of making long-life thin metal plate for automobile bodies
US4495008A (en) * 1980-07-28 1985-01-22 Zincroksid S.P.A. Process of making long-life thin metal plate for automobile bodies, and thin plate made thereby
US5707505A (en) * 1988-09-29 1998-01-13 Gesellschaft fur Technische Studien Entwicklung Planung mbH Method for the electrophoretic dip coating of chromatizable metal surfaces
GB2266895B (en) * 1992-05-15 1996-12-04 Wednesbury Diecasting And Meta Improvements relating to electrophoretic coatings
US20050104488A1 (en) * 2003-11-14 2005-05-19 Hunt Stacy A. Dishwaser with electrocoated dish rack

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Publication number Publication date
JPS4829296B1 (enrdf_load_stackoverflow) 1973-09-08

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