WO2008073887A2 - Procédé de traitement de surfaces métalliques avec un courant électrique alternatif - Google Patents

Procédé de traitement de surfaces métalliques avec un courant électrique alternatif Download PDF

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Publication number
WO2008073887A2
WO2008073887A2 PCT/US2007/086970 US2007086970W WO2008073887A2 WO 2008073887 A2 WO2008073887 A2 WO 2008073887A2 US 2007086970 W US2007086970 W US 2007086970W WO 2008073887 A2 WO2008073887 A2 WO 2008073887A2
Authority
WO
WIPO (PCT)
Prior art keywords
zinc
metallic surface
silicate
medium
amps
Prior art date
Application number
PCT/US2007/086970
Other languages
English (en)
Other versions
WO2008073887A9 (fr
WO2008073887A3 (fr
Inventor
Wayne Soucie
Dennis Winn
William Dalton
Original Assignee
Elisha Holding, Llc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Elisha Holding, Llc filed Critical Elisha Holding, Llc
Publication of WO2008073887A2 publication Critical patent/WO2008073887A2/fr
Publication of WO2008073887A3 publication Critical patent/WO2008073887A3/fr
Publication of WO2008073887A9 publication Critical patent/WO2008073887A9/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials

Definitions

  • Prior art processes have employed electrolytic cathodic process to deposit a beneficial layer with improved corrosion resistance on zinc, zinc alloy plated substrates and zinc diecast components.
  • First the deposition of Silicon is not inherently cathodic in nature. Therefore, without wishing to be bound by any theory or explanation, it is believed that the resulting layer is the result of the pH environment created by the cathodic polarity of the surface, not the direct reduction on the surface due to the availability of electrons.
  • a companion reaction which occurs at the anode. This companion reaction may facilitate the beneficial result and in typical Zinc plating where the Zinc+ ions required for plating can be electrically oxidized at the anode for electro-reduction to zinc metal at the cathode.
  • an electrolytic process for treating a metallic surface with silicates in order to improve the corrosion resistance of the metallic surface.
  • a method for treating a metallic surface comprises contacting a metallic surface with a medium comprising at least one silicate and providing an alternating current to the medium for a time and under conditions sufficient to improve the corrosion resistance of the metallic surface.
  • the silicate can be sodium silicate.
  • the medium can comprise water and at least one silicate.
  • the metallic surface can comprise at least one member selected from the group consisting of zinc, zinc nickel, tin zinc, and zinc iron.
  • the step of providing the alternating current to the medium comprises contacting the metallic surface with an alternating current while the metallic surface is at least partially in contact with the medium.
  • Figure 1 is a schematic of the apparatus and electrical system that can be used in an AC method of the invention.
  • Figure 2 is a graphical representation of the corrosion resistance of articles treated in accordance with the invention.
  • the instant invention relates to using AC current to treat a metallic surface (e.g., to provide the opportunity for all beneficial reactions based upon polarity to occur on the work piece) in a silicate containing medium.
  • the metallic surface can comprise an electroplated article (e.g., a zinc plated fastener), discrete components having a metallic surface, metallic or metallic coated sheets or rolls, among other surfaces.
  • the silicate containing medium can comprise water, at least one silicate, and optionally additives such as silica.
  • An example of a suitable silicate comprises sodium silicate.
  • the AC process has the advantages of: 1 ) no dimensionally stable anode is required and thereby minimizes capital costs for setting up the process, and 2) in this configuration work pieces comprise both sides of the electrical circuit; therefore time efficiency is increased in that finished parts can be processed simultaneously.
  • the electrical dynamics of AC current are different than the use of pulse rectifiers in that typical pulse sources generate waveforms similar to square waves. In this condition voltage transitions are extremely rapid to a set threshold and remain at the predefined level until rapidly changed again. Conventional AC current is constantly undergoing changes in voltage and current relationships, which can potentially change the chemical response at the surface of the work piece.
  • the exposed metallic surface can be rinsed and dried.
  • the exposed metallic surface is coated with a film or layer in order to impart improved corrosion resistance, color, and lubricity, among other properties.
  • suitable coatings can comprise at least one member selected from the group consisting of latex, epoxy, acrylics, and urethanes, among other coatings.
  • Fig 1 shows the physical components and electrical configuration of the inventive process.
  • a barrel process is shown, however, a rack process could utilize a similar electrical circuit.
  • Th ⁇ following Examples are provided to illustrate certain aspects of the invention and do not limit the scope of the appended claims.
  • Zinc plated rivets were treated in accordance with the following Examples. Medium/Solution: 9.8% Sodium Silicate in de-ionized Water

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

L'invention concerne un procédé permettant de procurer une protection améliorée contre la corrosion à des composants et à des surfaces métalliques lors de l'exposition du composants métalliques à un milieu de silicate tout en appliquant un courant AC (courant alternatif).
PCT/US2007/086970 2006-12-11 2007-12-10 Procédé de traitement de surfaces métalliques avec un courant électrique alternatif WO2008073887A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US87416506P 2006-12-11 2006-12-11
US60/874,165 2006-12-11

Publications (3)

Publication Number Publication Date
WO2008073887A2 true WO2008073887A2 (fr) 2008-06-19
WO2008073887A3 WO2008073887A3 (fr) 2008-07-31
WO2008073887A9 WO2008073887A9 (fr) 2008-09-12

Family

ID=39512429

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/086970 WO2008073887A2 (fr) 2006-12-11 2007-12-10 Procédé de traitement de surfaces métalliques avec un courant électrique alternatif

Country Status (2)

Country Link
US (1) US20080135135A1 (fr)
WO (1) WO2008073887A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3335074A (en) * 1964-05-14 1967-08-08 Cons Mining & Smelting Co Anodic treatment of zinc and zinc-base alloys
US20040222105A1 (en) * 2003-04-25 2004-11-11 Heimann Robert L. Method for preparing and using silicate systems to treat electrically conductive surfaces and products obtained therefrom

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6599643B2 (en) * 1997-01-31 2003-07-29 Elisha Holding Llc Energy enhanced process for treating a conductive surface and products formed thereby
US6592738B2 (en) * 1997-01-31 2003-07-15 Elisha Holding Llc Electrolytic process for treating a conductive surface and products formed thereby
US6322687B1 (en) * 1997-01-31 2001-11-27 Elisha Technologies Co Llc Electrolytic process for forming a mineral
US6153080A (en) * 1997-01-31 2000-11-28 Elisha Technologies Co Llc Electrolytic process for forming a mineral
WO1998033960A1 (fr) * 1997-01-31 1998-08-06 Elisha Technologies Co. L.L.C. Procede electrolytique pour former un revetement contenant un mineral
CN1639386A (zh) * 2001-08-03 2005-07-13 以利沙控股有限公司 一种处理金属表面的无电镀加工方法及由此所生产的产品
WO2003021009A2 (fr) * 2001-08-03 2003-03-13 Elisha Holding Llc Procede de traitement d'une surface conductrice et produits formes a partir de ladite surface
US6753039B2 (en) * 2001-08-03 2004-06-22 Elisha Holding Llc Electrolytic and electroless process for treating metallic surfaces and products formed thereby
CN1692178A (zh) * 2002-02-05 2005-11-02 以利沙控股有限公司 一种处理金属表面的方法以及由此形成的产品
AU2003297279A1 (en) * 2002-11-14 2004-06-15 Elisha Holding Llc Processes for electrocoating and articles made therefrom
US6919012B1 (en) * 2003-03-25 2005-07-19 Olimex Group, Inc. Method of making a composite article comprising a ceramic coating
US20050031894A1 (en) * 2003-08-06 2005-02-10 Klaus-Peter Klos Multilayer coated corrosion resistant article and method of production thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3335074A (en) * 1964-05-14 1967-08-08 Cons Mining & Smelting Co Anodic treatment of zinc and zinc-base alloys
US20040222105A1 (en) * 2003-04-25 2004-11-11 Heimann Robert L. Method for preparing and using silicate systems to treat electrically conductive surfaces and products obtained therefrom

Also Published As

Publication number Publication date
US20080135135A1 (en) 2008-06-12
WO2008073887A9 (fr) 2008-09-12
WO2008073887A3 (fr) 2008-07-31

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