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
  • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
  • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
  • C23C2/06—Zinc or cadmium or alloys based thereon
• • 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
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2933—Coated or with bond, impregnation or core
  • Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
• • 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
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2933—Coated or with bond, impregnation or core
  • Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
  • Y10T428/2958—Metal or metal compound in coating

Definitions

• the present invention relates to a hard steel wire with high carbon content, perfectly ductile, used for the manufacture of cables and springs, having a protective coating consisting of several layers of different alloys based on zinc, aluminum and of iron.
• the wire is characterized in that it is coated with a first internal layer of alloy (AI-Fe-Zn) comprising between 15% and 45% of AI, between 5% and 25% of Fe, the remainder consisting essentially of zinc and small amounts of additions of at least one of the elements from the group Mg, Sn, Ni, Cu, Cr and Mischmetal, the total of which does not exceed 0.5%, and a second outer layer of alloy comprising between 3% and 10% of AI, between 0.5% and 5% of Fe, the remainder consisting essentially of zinc and of small amounts of addition elements not exceeding one 0.5% total, from the group consisting of Mg, Sn, Ni, Cu, Cr, and Mischmetal.
• a first internal layer of alloy (AI-Fe-Zn) comprising between 15% and 45% of AI, between 5% and 25% of Fe, the remainder consisting essentially of zinc and small amounts of additions of at least one of the elements from the group Mg, Sn, Ni, Cu, Cr and Mischmetal, the total of which does not exceed 0.
• These coatings are obtained by a two-stage manufacturing process.
• document EP-AO 037143 describes a process for coating steel consisting of at least two immersions in baths with different temperatures, in particular metal baths of zinc and zinc alloy, such as Zn-AI with an AI content of between 3 and 10% by weight.
• the first stage of the process according to the invention thus consists of galvanizing with pure zinc by hot immersion in a bath of pure zinc followed by controlled cooling (R1) of 20 ° C / sec.
• the second stage of this process is an immersion of the first galvanizing coating in a bath of molten zinc-aluminum alloy, having the above-mentioned composition.
• the layer of pure zinc from the first galvanization disappears completely to give the layer of alloy A2 (AI-Zn-Fe).
• the process targeted by the invention therefore allows controlled diffusion of AI and Fe.
• the wire obtained as defined has a significantly improved corrosion resistance compared to the usual galvanized wires, while retaining excellent ductility and deformability characteristics (bending, winding, wire drawing, etc.).
• the resistance to accelerated corrosion in salt spray according to standard NFX41-002 (August 1975) of the wire according to the invention is at least twice as high as that of a traditional galvanized wire as shown by tests carried out.
• rust appears after approximately 150 hours on a traditional galvanized wire, and after 400 hours on a wire provided of a coating according to the invention.
• these times are 300 hours and 800 hours respectively.
• cathodic protection in a chlorinated medium of the coating according to the invention is at least equal to that of traditional galvanized wire.
• Corrosion tests were also carried out in an S0 2 atmosphere, at 10 ppm S0 2 , the table of which presents the results expressed in weight loss due to corrosion for various samples exposed in an atmosphere at 10 ppm S0 2 and examined. after 3 days, 1, 2, 3 and 4 weeks.
• the samples were wound on a 10 mm diameter mandrel before the test.
• Wires with a low zinc coating (10 ⁇ m) show red rust after 3 days of exposure.
• the galvanized wires with a coating thickness of 21 ⁇ m are corroded (with attack by the steel) after one week and those with a thickness of 35 ⁇ m reveal rust after two weeks of exposure.
• the corrosion resistance of the wire obtained according to the invention is greater than that of similar Zn-AI coatings, but deposited in a single operation, without controlled diffusion.
• the controlled cooling R1 of the wire at the outlet of the first bath was 20 ° C per second
• the cooling R2 after the second bath was 100 ° C per second.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Coating With Molten Metal (AREA)
• Conductive Materials (AREA)
• Non-Insulated Conductors (AREA)
• Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Applications Claiming Priority (2)

Publications (2)

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• 1983
  • 1983-06-28 FR FR8310660A patent/FR2548216B1/fr not_active Expired
• 1984
  • 1984-06-19 EP EP84401266A patent/EP0132424B1/fr not_active Expired
  • 1984-06-19 DE DE8484401266T patent/DE3477676D1/de not_active Expired
  • 1984-06-26 AU AU29894/84A patent/AU567948B2/en not_active Ceased
  • 1984-06-26 US US06/624,961 patent/US4605598A/en not_active Expired - Lifetime
  • 1984-06-27 ES ES533776A patent/ES533776A0/es active Granted
  • 1984-06-28 JP JP59132127A patent/JPS6052568A/ja active Granted

Non-Patent Citations (1)

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