Jeffrey L Sturgill

US Patent:

6818313, Nov 16, 2004

Filed:

Jul 24, 2002

Appl. No.:

10/202589

Inventors:

Andrew W. Phelps - Kettering OH
Jeffrey A. Sturgill - Fairborn OH

Assignee:

University of Dayton - Dayton OH

International Classification:

C23C 1800

US Classification:

428457, 106 117, 106 122, 106 129, 148243, 148247, 148253, 148258, 148259, 148260, 148261, 428469, 428470, 428472, 4284721, 4284722, 4284723

Abstract:

A corrosion-inhibiting coating, process, and system that provides a tight, adherent zinc- or zinc-alloy coating that is directly deposited onto steel or cast iron surfaces for enhanced corrosion protection. A process for applying the coating is also provided. The process includes the application of two sequential aqueous baths. The first bath contains a precursor zinc compound while the second bath contains a reducing agent to deposit the zinc directly upon the steel or cast iron.

US Patent:

6833124, Dec 21, 2004

Filed:

Jan 31, 2002

Appl. No.:

10/066533

Inventors:

Andrew Wells Phelps - Kettering OH
Jeffrey Allen Sturgill - Fairborn OH
Joseph Thomas Swartzbaugh - Phillipsburg OH

Assignee:

University of Dayton - Dayton OH

International Classification:

C22B 3400

US Classification:

423 55, 423 58, 210913

Abstract:

A process for recovery of hexavalent chromium from waste streams. The method includes providing a waste stream containing hexavalent chromium, reacting a soluble non-toxic precipitating reagent with the hexavalent chromium to form an insoluble precipitating reagent-chromate precipitate, and recovering the insoluble precipitating reagent-chromate precipitate. It may optionally include reacting the insoluble precipitating reagent-chromate precipitate with an acidic solution to form an insoluble precipitating reagent precipitate and a soluble hexavalent chromium compound, and recovering the soluble hexavalent chromium compound. The process may also include reacting the insoluble precipitating reagent precipitate with a solubilizing reagent to form the soluble non-toxic precipitating reagent.

US Patent:

7235142, Jun 26, 2007

Filed:

Jan 4, 2002

Appl. No.:

10/038150

Inventors:

Jeffrey Allen Sturgill - Fairborn OH, US
Andrew Wells Phelps - Kettering OH, US
Joseph Thomas Swartzbaugh - Phillipsburg OH, US

Assignee:

University of Dayton - Dayton OH

International Classification:

C23C 22/48

US Classification:

148273, 148253

Abstract:

Rinsing or sealing solutions based on cobalt are described for barrier films such as anodic coatings, phosphate coatings, or “black oxide” coatings. The treated films contain a trivalent or tetravalent cobalt/valence stabilizer complex. The rinsing or sealing bath may also contain an optional preparative agent or an optional solubility control agent. The oxidized cobalt is present in the coating in a “sparingly soluble” form. The valence stabilizers can be either inorganic or organic in nature. Cobalt/valence stabilizer combinations are chosen based on the well-founded principles of cobalt coordination chemistry. A number of cobalt/valence stabilizer combinations that match the performance of conventional hexavalent chromium systems are presented.

US Patent:

7291217, Nov 6, 2007

Filed:

Jul 23, 2003

Appl. No.:

10/625885

Inventors:

Andrew Wells Phelps - Kettering OH, US
Jeffrey Allen Sturgill - Fairborn OH, US
Joseph Thomas Swartzbaugh - Clayton OH, US

Assignee:

University of Dayton - Dayton OH

International Classification:

C04B 9/02
C09C 1/36
C08K 3/00
C09K 3/00
C23F 11/00

US Classification:

106480, 106419, 106436, 106438, 106439, 106440, 106441, 106442, 106435, 106450, 106455, 106456, 106 1405, 106 1411, 106 1412, 106 1441, 252387, 148247, 148248, 148253, 148257, 148275

Abstract:

A corrosion-inhibiting pigment comprising a rare earth element and a valence stabilizer combinded to form a rare earth/valence stabilizer complex. The rare earth element is selected from cerium, terbium, praseodymium, or a combination thereof, and at least one rare earth element is in the tetravalent oxidation state. An inorganic or organic material is used to stabilize the tetravalent rare earth ion to form a compound that is sparingly soluble in water. Specific stabilizers are chosen to control the release rate of tetravalent cerium, terbium, or praseodymium during exposure to water and to tailor the compatibility of the powder when used as a pigment in a chosen binder system. Stabilizers may also modify the processing and handling characteristics of the formed powders. Many rare earth-valence stabilizer combinations are presented that can equal the performance of conventional hexavalent chromium systems.

US Patent:

7294211, Nov 13, 2007

Filed:

Jan 4, 2002

Appl. No.:

10/038274

Inventors:

Jeffrey Allen Sturgill - Fairborn OH, US
Andrew Wells Phelps - Kettering OH, US
Joseph Thomas Swartzbaugh - Phillipsburg OH, US

Assignee:

University of Dayton - Dayton OH

International Classification:

C22C 22/48

US Classification:

148273, 148243, 106 1405, 106 1421, 252387, 2523871

Abstract:

Conversion coatings based on cobalt are described for substrate metals such as aluminum, zinc, magnesium, titanium, cadmium, silver, copper, tin, lead, cobalt, zirconium, beryllium, or indium, their alloys, or items coated with these metals. The conversion coating contains a trivalent or tetravalent cobalt/valence stabilizer complex. The coating bath may also contain a preparative agent or solubility control agent. The oxidized cobalt is present in the coating in a “sparingly soluble” form. The valence stabilizers can be either inorganic or organic in nature. Cobalt/valence stabilizer combinations are chosen based on the well-founded principles of cobalt coordination chemistry. A number of cobalt/valence stabilizer combinations that match the performance of conventional hexavalent chromium systems are presented.

US Patent:

7407711, Aug 5, 2008

Filed:

Jul 23, 2003

Appl. No.:

10/625915

Inventors:

Andrew Wells Phelps - Kettering OH, US
Jeffrey Allen Sturgill - Fairborn OH, US
Joseph Thomas Swartzbaugh - Clayton OH, US

Assignee:

University of Dayton - Dayton OH

International Classification:

C23F 11/00
C09K 3/10

US Classification:

428469, 106 1405, 106 1411, 106 1441, 106480, 252387, 2523892, 2523894, 148247, 148253, 148257, 148285, 428432, 428444, 428457

Abstract:

Conversion coatings comprising a rare earth element and a valence stabilizer combined to form a rare earth/valence stabilizer complex are described for substrate metals. The rare earth element is selected from cerium, praseodymium, terbium, or combinations thereof, and at least one rare earth element is in the tetravalent oxidation state. The coating bath may also contain a preparative or solubility control agent. The oxidized cerium, praseodymium or terbium is present in the coating in a “sparingly soluble” form. The valence stabilizers can be either inorganic or organic in nature. A number of cerium, praseodymium, or terbium/valence stabilizer combinations are presented that can equal the performance of conventional hexavalent chromium systems.

US Patent:

7422793, Sep 9, 2008

Filed:

Jul 23, 2003

Appl. No.:

10/625886

Inventors:

Andrew Wells Phelps - Kettering OH, US
Jeffrey Allen Sturgill - Fairborn OH, US
Joseph Thomas Swartzbaugh - Clayton OH, US

Assignee:

University of Dayton - Dayton OH

International Classification:

C23F 11/00
C09K 3/10

US Classification:

428469, 106 1405, 106 1411, 106 1441, 106480, 252387, 2523892, 2523894, 148247, 148248, 148253, 148257, 148285, 428432, 428444, 428457

Abstract:

Rinsing or sealing solutions comprising a rare earth element and a valence stabilizer for barrier films. The treated films contain a rare earth/valence stabilizer complex. The rare earth element is selected from cerium, praseodymium, terbium, or combinations thereof, and at least one rare earth element is in the tetravalent oxidation state. The rinsing or sealing solution may also contain an optional preparative or solubility control agent. The oxidized rare earth element is present in the coating in a “sparingly soluble” form. The valence stabilizers can be either inorganic or organic in nature. A number of rare earth/valence stabilizer combinations that match the performance of conventional hexavalent chromium systems are presented.

US Patent:

7537663, May 26, 2009

Filed:

Jun 23, 2004

Appl. No.:

10/875041

Inventors:

Andrew W. Phelps - Kettering OH, US
Jeffrey A. Sturgill - Fairborn OH, US

Assignee:

University of Dayton - Dayton OH

International Classification:

C23C 28/02
C23C 22/05
C25D 3/22

US Classification:

148243, 148258, 148261, 148276, 148280, 205118, 205126, 205155, 205244, 205305, 427 61

Abstract:

A corrosion-inhibiting coating, process, and system that provides a tight, adherent zinc- or zinc-alloy coating that is directly deposited onto steel or cast iron surfaces for enhanced corrosion protection. A process for applying the coating is also provided. The process includes the application of two sequential aqueous baths. The first bath contains a precursor zinc compound while the second bath contains a reducing agent to deposit the zinc directly upon the steel or cast iron.