Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS3514407 A
Publication typeGrant
Publication dateMay 26, 1970
Filing dateSep 28, 1966
Priority dateSep 28, 1966
Publication numberUS 3514407 A, US 3514407A, US-A-3514407, US3514407 A, US3514407A
InventorsMissel Leo
Original AssigneeLockheed Aircraft Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Chemical polishing of titanium and titanium alloys
US 3514407 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

United States Patent 3,514,407 CHEMICAL POLISHING 0F TITANIUM AND TITANIUM ALLOYS Leo Missel, Endwell, N.Y., assignor to Lockheed Missiles 8: Space Company, a division of Lockheed Aircraft Corporation, Sunnyvale, Calif., a corporation of California No Drawing. Filed Sept. 28, 1966, Ser. No. 583,125

Int. Cl. C2313 3/04, 1/00 U.S. Cl. 252-793 2 Claims ABSTRACT OF THE DISCLOSURE Solutions for polishing titanium and titanium alloy surfaces are disclosed. The solutions are mixtures of fluosilicic acid, hydrofluoric acid, nitric acid, acetic acid, and phosphoric acid. Polishing is accomplished by immersing objects made of titanium or titanium alloys in a solution containing the above acids at room temperature or elevated temperatures for periods up to 90 minutes.

This invention is a new and improved chemical solution for imparting bright and lustrous surfaces to articles made of titanium and alloys thereof.

In the past, metal surface polishing has been accomplished by dissolving thin layers of the metal chemically, or by abrading the surface, or by both.

The object of the present invention is to provide a chemical solution for imparting a visually bright and reflective surface to articles made of titanium and its alloys, with a minimum metal loss and minimum thermal emittance.

A further object is to provide a chemical solution for cleaning the surfaces of articles made of titanium and its alloys, preparatory to the firm bonding thereto of silicate paints, and the like.

Another object is to provide a metal surface polishing solution that requires the use of no electrical energy, does not require critical control of trained workers, and that provides results that are superior to comparable results attained by the use of processes that have been available to the trade previously.

The solutions that comprise the present invention are closely related in their compositions. In both solutions the titanium, or titanium alloy article, is immersed at ambient temperature or the temperature may be elevated to decrease the period of immersion.

Illustratively the solution for pure titanium articles is:

Phosphoric acid (85%) 17 Temperature (ambient). Time (-90 minutes).

3,514,407 Patented May 26, 1970 Illustratively an alloy of the composition by weight of 90% titanium, 6% aluminum and 4% vanadium is immersed in the solution:

EXAMPLE 2 Percent by volume Fluosilicic acid (31%) 20 Hydroflnoric acid (48%) 15 Nitric acid 45 Acetic acid (99 10 Phosphoric acid 10 Temperature (ambient). Time (15-45 minutes).

1. A solution for chemically polishing pure titanium metal, said solution consisting of: 33% by volume fluosilicic acid (31%), 8% by volume hydrofluoric acid (48%), 25% by volume nitric acid (70%), 17% by volume acetic acid (99;+%), and 17% by volume phosphoric acid (85%).

2. A solution for chemically polishing a titanium alloy wherein said titanium alloy consists essentially of the composition by weight of titanium, 6% aluminum, and 4% vanadium; said solution consisting of: 20% by volume fluosilicic acid (31%), 15% by volume hydrofiuoric acid (48%), 45% by volume nitric acid (70%), 10% by Volume acetic acid (99;+%), and 10% by volume phosphoric acid (85 References Cited UNITED STATES PATENTS 3,202,612 8/1965 Nelson 25279.2 3,085,917 4/1963 Netzler et a1. 25279.3 XR 3,007,780 11/1961 Beigay et al. 252--79.3 XR 2,559,445 7/1951 Lotz 252136 2,711,364 6/1955 Beach 41-42 3,125,474 3/ 1964 Watkins et al. 15618 LEON D. ROSDOL, Primary Examiner D. L. ALBRECHT, Assistant Examiner U.S. Cl. X.R.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2559445 *Dec 12, 1946Jul 3, 1951Union Switch & Signal CoMethod for removing scale from steel
US2711364 *Dec 31, 1953Jun 21, 1955Beach John GPolishing metals and composition therefor
US3007780 *Mar 20, 1958Nov 7, 1961Titanium Metals CorpTitanium etching
US3085917 *May 27, 1960Apr 16, 1963Gen ElectricChemical cleaning method and material
US3125474 *Jan 6, 1960Mar 17, 1964 Pickling zirconium and zirconium base alloys
US3202612 *Dec 5, 1960Aug 24, 1965Monsanto CoComposition for bright polishing aluminum
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3607398 *Jun 18, 1969Sep 21, 1971Avco CorpChemical stripping process
US3850712 *Jun 12, 1972Nov 26, 1974Rolls RoyceMethod of etching a titanium or titanium alloy part
US3891456 *Oct 17, 1973Jun 24, 1975Us Air ForceSurface treatment of titanium and titanium alloys
US4071397 *Jul 2, 1973Jan 31, 1978Motorola, Inc.Silicon metallographic etch
US4230522 *Dec 26, 1978Oct 28, 1980Rockwell International CorporationPNAF Etchant for aluminum and silicon
US4277289 *Jul 6, 1979Jul 7, 1981Aluminum PechineyProcess for removing titaniferous and silico-aluminous incrustations from surfaces
US4477364 *Nov 7, 1983Oct 16, 1984Capetrol International, Inc.Acidic glass cleaning composition
US4551434 *Feb 22, 1984Nov 5, 1985Mtu Motoren-Und Turbinen-Union Muenchen GmbhMethod for recognizing structural inhomogeneities in titanium alloy test samples including welded samples
US4704126 *Apr 15, 1985Nov 3, 1987Richards Medical CompanyChemical polishing process for titanium and titanium alloy surgical implants
US4900398 *Jun 19, 1989Feb 13, 1990General Motors CorporationChemical milling of titanium
US4944986 *Jan 13, 1989Jul 31, 1990Zuel CompanyAnti-reflective glass surface
US5120605 *Mar 27, 1990Jun 9, 1992Zuel Company, Inc.Anti-reflective glass surface
US6833328Jun 9, 2000Dec 21, 2004General Electric CompanyMethod for removing a coating from a substrate, and related compositions
US6852879 *Sep 26, 2002Feb 8, 2005Bp Corporation North America Inc.Method of removing iron oxide deposits from the surface of titanium components
US6863738Jan 29, 2001Mar 8, 2005General Electric CompanyMethod for removing oxides and coatings from a substrate
US6916429Oct 21, 2002Jul 12, 2005General Electric CompanyProcess for removing aluminosilicate material from a substrate, and related compositions
US6929861Mar 5, 2002Aug 16, 2005Zuel Company, Inc.Anti-reflective glass surface with improved cleanability
US6953533Jun 16, 2003Oct 11, 2005General Electric CompanyProcess for removing chromide coatings from metal substrates, and related compositions
US20040074873 *Oct 21, 2002Apr 22, 2004General Electric CompanyProcess for removing aluminosilicate material from a substrate, and related compositions
US20040169013 *Feb 28, 2003Sep 2, 2004General Electric CompanyMethod for chemically removing aluminum-containing materials from a substrate
US20050115926 *Jun 16, 2003Jun 2, 2005General Electric CompanyProcess for removing chromide coatings from metal substrates, and related compositions
US20050161438 *Jan 13, 2005Jul 28, 2005Kool Lawrence B.Method for chemically removing aluminum-containing materials from a substrate
EP1162286A1 *May 31, 2001Dec 12, 2001General Electric CompanyA method for removing a coating from a substrate
EP1178526A2 *Jul 27, 2001Feb 6, 2002Mitsubishi Chemical CorporationMixed acid solution in etching process, process for producing the same, etching process using the same and process for producing semiconductor device
EP1431421A1 *Oct 17, 2003Jun 23, 2004General Electric CompanyProcees and compositions for removing aluminosilicate material from a substrate
WO2000066808A1 *Apr 30, 1999Nov 9, 2000Kislyakov Yury VyacheslavovichMethod for chemically processing articles made of titanium or alloys thereof
WO2004031448A1 *Oct 1, 2003Apr 15, 2004Anselmi MarcoAqueous composition for the chemical removal of metallic surfacing present on turbine blades, and its use
WO2005017230A1 *Aug 6, 2004Feb 24, 2005Makoto IshikawaEtching solution for titanium-containing layer and method for etching titanium-containing layer
U.S. Classification252/79.3, 510/488, 134/41, 510/269, 252/79.4, 216/109, 510/257
International ClassificationC23F3/00, C23F3/06
Cooperative ClassificationC23F3/06
European ClassificationC23F3/06