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| Number | Title | Issue Date |
| 7052592 | Chromium plating method An electrolyte bath and method of electrolytically plating a layer of metallic chromium on a substrate comprises providing an electrolyte bath of a trivalent chromium, passing a current through the bath from an anode to a cathode which receives the substrate, mainta... | 05/30/2006 |
| 6342554 | Surface treatment agent for steel material Disclosed herein is a surface treatment agent for steel, characterized in that, said agent contains 0.1-15% by mass of chromium sulfate and 10-40% by mass of a binder resin containing butyral resin or a mixture of butyral resin with another resin which is... | 01/29/2002 |
| 5876517 | Chromate-plating bath and process for finishing zinc zinc alloy or cadmium surfaces Process for finishing zinc, zinc alloy or cadmium surfaces which consists in bringing the components to be treated into contact first with an acidic chromate-plating bath based on chromium, cobalt and silver salts and then with a top coat bath comprising ... | 03/02/1999 |
| 5769968 | Method for manufacturing a developer support A method of making a developer support by forming an amorphous film on a metal substrate where the film is chromium, zinc with oxygen or hydrogen.... | 06/23/1998 |
| 5735972 | Black chromate-treatment solution for Zn-Ni alloy plated film A black chromate-treatment solution for Zn-Ni alloy plated film comprises 1 to 100 g/l of hexavalent chromium, 1 to 100 g/l of hydrochloric acid residues and/or sulfuric acid residues, 1 to 100 g/l of nitric acid residues and 1 to 100 g/l of at least one ... | 04/07/1998 |
| 5565042 | Black chromate solution A chemically stable black chromate solution capable of forming an anticorrosive black chromate film on a Zn-Ni alloy plating is provided, the components being easily soluble in the solution. The black chromate solution comprises 1 to 50 g/l of hexavalent ... | 10/15/1996 |
| 5147597 | Prestabilized chromium protective film to reduce radiation buildup The buildup of radioactive contaminants on the inside surface of light water reactor water systems is retarded by the use of a chromium coating of at least five hundred Angstroms on the surface exposed to the water system. The chromium coating is then pas... | 09/15/1992 |
| 5080733 | Method for producing chromate conversion coatings Chromate conversion coatings of improved corrosion resistance are produced through use of chromate conversion coating compositions containing alkane sulfonic acid.... | 01/14/1992 |
| 4818727 | Method of improving the corrosion resistance of aluminum contacts on semiconductors A method for improving the corrosion resistance of aluminum in a semiconductor device. The step includes providing a semiconductor device having aluminum containing contact pads; attaching a leadframe to the contact pads; and applying sufficient zinc chro... | 04/04/1989 |
| 4776898 | Passivation A method of passivating a zinc-cobalt alloy, which alloy has a cobalt content of 0.1-2%, by contacting the alloy with an aqueous composition which has a pH of 0.5-2.5 and contains hexavalent chromium, hydrogen ions to provide the pH, chloride ions and sul... | 10/11/1988 |
| 4620882 | Process for continuously coloring stainless steel A continuous process for coloring a stainless steel strip by continuously causing the strip to pass through a coloring solution wherein a potential difference between the steel of the strip and a reference electrode in the coloring solution is monitored r... | 11/04/1986 |
| 4591416 | Chromate composition and process for treating zinc-nickel alloys The present invention includes an aqueous acidic chromate solution, suitable for forming colored chromate coatings on zinc-nickel alloy electrodeposits containing up to about 15% by weight nickel, which solutions have a pH within the range of about 1.3 to... | 05/27/1986 |
| 4579606 | Metal sheet that selectively absorbs solar radiation In order to obtain a film having a low electric resistance and a good selective absorption property of solar radiation, good rust proofing and good weldability, a stainless steel is dipped in a chemical conversion bath, in which sodium bichromate or potas... | 04/01/1986 |
| 4491487 | Method for producing a selective absorption sheet of a solar radiation In order to obtain a film having a low electric resistance and a good selective absorption property of solar radiation, good rust proofing and good weldability, a stainless steel is dipped in a chemical conversion bath, in which sodium bichromate or potas... | 01/01/1985 |
| 4384902 | Trivalent chromium passivate composition and process An aqueous acidic solution and process for treating metal surfaces, particularly zinc and zinc alloy surfaces, for depositing a passivate film of improved clarity and hardness and to impart improved corrosion resistance thereto. The solution contains effe... | 05/24/1983 |
| 4370210 | Method and apparatus for continuously forming color display layer on stainless steel strip In continuously forming color display layer on the surface of the stainless steel strip, potential difference between the strip immersed in the oxidizing solution and a reference electrode is utilized for controlling the thickness, or color tone, of the c... | 01/25/1983 |
| 4367099 | Trivalent chromium passivate process A process for treating metal surfaces, particularly zinc and zinc alloy surfaces, for depositing a passivate film of improved corrosion resistance and hardness which comprises the steps of providing an aqueous acidic solution containing effective amounts ... | 01/04/1983 |
| 4359345 | Trivalent chromium passivate solution and process An aqueous acidic solution and process for treating metal surfaces, particularly zinc and zinc alloy surfaces, to impart improved corrosion resistance thereto. The solution contains effective amounts of chromium ions substantially all of which are in the ... | 11/16/1982 |
| 4359346 | Trivalent chromium passivate solution and process for yellow passivate film An aqueous acidic solution and process for treating receptive metal surfaces, particularly zinc and zinc alloy surfaces, to impart a light-yellow iridescent passivate film thereon imparting improved corrosion resistance thereto. The aqueous solution conta... | 11/16/1982 |
| 4349392 | Trivalent chromium passivate solution and process An aqueous acidic solution and process for treating metal surfaces, particularly zinc and zinc alloy surfaces, for depositing a passivate film of improved clarity and hardness and to impart improved corrosion resistance thereto. The solution contains effe... | 09/14/1982 |
| 4266988 | Composition and process for inhibiting corrosion of ferrous or non-ferrous metal surfaced articles and providing receptive surface for synthetic resin coating compositions No-rinse compositions and a process are provided for inhibiting corrosion of ferrous or non-ferrous metal surfaces and for producing a surface to which synthetic resin coating compositions will adhere so that the resultant coatings have satisfactory impac... | 05/12/1981 |
| 4263343 | Reference elements for ion-selective membrane electrodes A reference element for ion-selective membrane electrodes is prepared by coating portions of a layer of silver with a composition comprising a metal salt electrolyte, a hydrophilic binder and a membrane of the group consisting of an oxidizing agent and a ... | 04/21/1981 |
| 4263059 | Coating solutions of trivalent chromium for coating zinc and cadmium surfaces Aqueous acidic chromate coating solutions are described for treating zinc, zinc alloy, or cadmium surfaces comprising trivalent chromium as substantially the only chromium ion present, fluoride ion and an acid, the trivalent chromium ions comprising a mix... | 04/21/1981 |
| 4221832 | Surface treatment of metal strip Metal strip, particularly steel strip, is heated above 300° C. and immersed in a coating bath whose temperature is at least 80° C. and which contains at least one metal salt, the strip being coated with a metal layer, e.g. Ni-based or Cr-based, by the c... | 09/09/1980 |
| 4171231 | Coating solutions of trivalent chromium for coating zinc surfaces Aqueous acidic coating solutions are described for treating zinc or zinc alloy surfaces comprising trivalent chromium as substantially the only chromium ion present, fluoride ion, an acid other than nitric acid, and an oxidizing agent. The coating solutio... | 10/16/1979 |
| 4126490 | Composition for forming chromate coating Compositions for forming chromate coatings on zinc metal or zinc alloys typically contain water as a solvent with hexavalent chromium compounds therein as active ingredients. Such hexavalent chromium compounds are environmentally undesirable. An aqueous c... | 11/21/1978 |
| 4097311 | Absorption surface of solar collector The present invention relates to a selective absorption surface of a solar collector in which a coating layer consisting of the predetermined composition of metal oxide is tightly adhered to a substrate having the mirror-like surface in the predetermined ... | 06/27/1978 |
| 4063993 | Method of making gang bonding interconnect tape for semiconductive devices A gang bonding interconnect tape for use in an automatic bonding machine for gang bonding of semiconductive devices is fabricated by depositing a series of electrically insulative support structures, such as rings of epoxy resin, onto a metallic tape, as ... | 12/20/1977 |
| 4026737 | Method for coloring a stainless steel A method for coloring a stainless steel using a potential-time curve which comprises seeking for an individual coloring potential difference to be colored by compensating a standard coloring potential difference by difference between a standard inflexion ... | 05/31/1977 |
| 3964914 | Electromarking solution This invention is directed to an aqueous halogen-free electromarking solution which possesses the capacity for marking a broad spectrum of metals and alloys selected from different classes. The aqueous solution comprises basically the nitrate salt of an a... | 06/22/1976 |
