Chyang Jer Wu

US Patent:

7291252, Nov 6, 2007

Filed:

Nov 25, 2002

Appl. No.:

10/303529

Inventors:

Jian X. Li - Murrysville PA, US
Daniel E. Bullard - Valporaiso IN, US
Chyang J. Wu - Monroeville PA, US

Assignee:

United States Steel Corporation - Pittsburgh PA

International Classification:

C25D 13/12

US Classification:

204486, 204487, 204500

Abstract:

Steel cabinet parts and other steel objects are electrocoated in a cationic resin-containing bath. The steel objects are chromium-coated, free of phosphate and preferably free of chromium oxide. The products are not significantly subject to filiform corrosion, and the process is economically beneficial because throwpower is more easily controlled than in previous processes.

US Patent:

20080020226, Jan 24, 2008

Filed:

Sep 25, 2007

Appl. No.:

11/903845

Inventors:

Jian Li - Murrysville PA, US
Daniel Bullard - Valporaiso IN, US
Chyang Wu - Monroeville PA, US

International Classification:

C25D 13/00

US Classification:

428577000, 205224000, 205067000

Abstract:

Steel cabinet parts and other steel objects are electrocoated in a cationic resin-containing bath. The steel objects are chromium-coated, free of phosphate and preferably free of chromium oxide. The products are not significantly subject to filiform corrosion, and the process is economically beneficial because throwpower is more easily controlled than in previous processes.

US Patent:

53166531, May 31, 1994

Filed:

Jul 30, 1992

Appl. No.:

7/922994

Inventors:

Chyang J. Wu - Monroeville PA
Jack E. Manack - Murrysville PA

Assignee:

USX Corporation - Pittsburgh PA

International Classification:

C25D 356

US Classification:

205245

Abstract:

A process and electrolyte for forming mound-free coatings of zinc-iron alloy on metal, e. g. steel, sheet and strip comprises passing the article to be plated through an electrolyte bath containing chlorides of iron and zinc and from about 2 to about 6 g/l, and particularly about 2. 5 to about 3. 5 g/l, of citric acid.