Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
  • E04D3/00—Roof covering by making use of flat or curved slabs or stiff sheets
  • E04D3/24—Roof covering by making use of flat or curved slabs or stiff sheets with special cross-section, e.g. with corrugations on both sides, with ribs, flanges, or the like
  • E04D3/30—Roof covering by making use of flat or curved slabs or stiff sheets with special cross-section, e.g. with corrugations on both sides, with ribs, flanges, or the like of metal
• • 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
  • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
  • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
  • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
  • C23C8/10—Oxidising

Definitions

• the invention relates to a method for producing brown cover layers on copper semi-finished products, in particular on rolled strips and sheets for roofing and facade cladding.
• a firmly adhering and stable top layer of copper oxide forms on the surface of bare metal copper.
• the initially very thin oxide film stabilizes the surface of the copper material noticeably against the effects of the atmosphere.
• the slow development of the oxide layer as a result of the reaction of the copper with moisture and atmospheric oxygen ideally gradually produces a uniform brown color (brown patina), the surface of the copper increasingly losing its metallic luster.
• the brown top layer gets darker over time and then changes to an anthracite brown. This is the final state that usually occurs on vertical building surfaces, such as external wall cladding.
• the top layer changes color in reaction to the substances contained in the atmosphere, such as sulfur dioxide, carbon dioxide and chlorides, to give basic copper compounds until the copper-typical patina green is reached.
• the formation of the brown cover layer can, however, under certain atmospheric conditions be considerably delayed in places but also accelerate, so that, as a rule, it is necessary to wait a relatively long time until a uniform discoloration of the copper surface is achieved. Deviations from a uniform color tone can be observed in particular in the early stages of weathering. In many cases, uneven dark spots and / or stripes often form on the copper surface. However, as the weathering continues due to atmospheric influences, these color differences disappear.
• the invention has for its object to provide a method with which a uniform and firmly adhering brown cover layer (brown patina) can be produced on the surface of copper-made semifinished product, which is not damaged even in the further processing necessary in particular in the construction or flakes off.
• pre-patinated strips or sheets made of copper produced by the process according to the invention have cover layers which both have excellent adhesive strength and remain preform-resistant when bent or folded, i.e. H. show no detachment. Even the fingerprints that are often unavoidable when installing roof coverings and facade cladding remain largely unremarkable on the pre-patinated surface.
• An even better adhesive strength of the top layer and, in particular, an even more uniform brown coloration of the prepatinated copper surface can be achieved in that, immediately after the heat treatment, a chemical post-oxidation with an aqueous solution of at least one metal salt from the group comprising potassium chlorate, potassium permanganate and sodium hypochlorite alone or in a mixture is carried out with copper sulfate.
• a cold-rolled and possibly degreased band made of SF copper in accordance with DIN 1787 with a thickness of 0.6 mm and a width of 1000 mm was roughened uniformly by means of a grinding device. Sanding belts with grit no. 180 and no. 320 used.
• the copper strip was then fed to a gas heated continuous furnace for heat treatment. In order to oxidize the surface of the copper strip heat-treated in the temperature range from 150 to 350 ° C., preferably at about 275 ° C., a controlled gas atmosphere with approximately 25% by volume oxygen was set in the furnace. After a brief cooling stretch, the pre-oxidized copper strip was then immersed at a working temperature of approximately 80 ° C.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Chemical Treatment Of Metals (AREA)
• Laminated Bodies (AREA)
• Physical Vapour Deposition (AREA)
• Roof Covering Using Slabs Or Stiff Sheets (AREA)
• Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
• Paints Or Removers (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Adornments (AREA)
• Tyre Moulding (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)
• Manufacturing Of Printed Wiring (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6417188

Family Applications (1)

Country Status (15)

Cited By (3)

Families Citing this family (7)

Citations (6)

Family Cites Families (2)

• 1990
  • 1990-10-27 DE DE4034249A patent/DE4034249A1/de not_active Withdrawn
• 1991
  • 1991-10-04 ZA ZA917973A patent/ZA917973B/xx unknown
  • 1991-10-11 DK DK91117338.3T patent/DK0483568T3/da active
  • 1991-10-11 DE DE59106523T patent/DE59106523D1/de not_active Expired - Lifetime
  • 1991-10-11 EP EP91117338A patent/EP0483568B1/fr not_active Expired - Lifetime
  • 1991-10-11 ES ES91117338T patent/ES2077133T3/es not_active Expired - Lifetime
  • 1991-10-11 AT AT91117338T patent/ATE128192T1/de not_active IP Right Cessation
  • 1991-10-15 FI FI914862A patent/FI96777C/fi active
  • 1991-10-16 RU SU915001722A patent/RU2023750C1/ru not_active IP Right Cessation
  • 1991-10-24 CA CA002054166A patent/CA2054166C/fr not_active Expired - Fee Related
  • 1991-10-25 JP JP03280070A patent/JP3111094B2/ja not_active Expired - Fee Related
  • 1991-10-25 NO NO914196A patent/NO303787B1/no unknown
  • 1991-10-25 PT PT99330A patent/PT99330B/pt not_active IP Right Cessation
  • 1991-10-25 AU AU86776/91A patent/AU633764B2/en not_active Ceased
  • 1991-10-28 US US07/783,002 patent/US5282890A/en not_active Expired - Lifetime
• 1995
  • 1995-11-09 GR GR950403151T patent/GR3018053T3/el unknown

Patent Citations (6)

Non-Patent Citations (7)

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