Chong Seng Liu

US Patent:

42845157, Aug 18, 1981

Filed:

Dec 10, 1979

Appl. No.:

6/102167

Inventors:

Chong T. Liu - West Nyack NY

Assignee:

Stauffer Chemical Company - Westport CT

International Classification:

C02F 154

US Classification:

210724

Abstract:

A process is provided for decreasing elemental phosphorus levels in an aqueous medium containing elemental phosphorus. Preferably, the elemental phosphorus levels are at about 10 ppm or less. The process comprises adding to the aqueous medium an effective amount of caustic, preferably Ca(OH). sub. 2, the effective amount being an amount sufficient to increase the pH of the aqueous medium to at least about 11, to produce a basic aqueous medium. The basic aqueous medium is then clarified and neutralized.

US Patent:

46630007, May 5, 1987

Filed:

Jul 25, 1985

Appl. No.:

6/757721

Inventors:

Chong T. Liu - West Nyack NY

Assignee:

Kollmorgan Technologies, Corp. - Dallas TX

International Classification:

C25D 322

US Classification:

204 551

Abstract:

The present invention relates an aqueous composition and process for electro-depositing at a pH of about 1 to 3. 5, a ductile, highly adhesive, adsorptive and absorptive zinc coating on a metal article. The article with the electro-deposited zinc coating can be subjected to further treatment, such as, a second functional or decorative coating or painting and forming. The ductile zinc coating is resistant to cracking during forming and metal articles treated in accordance to the present invention, including the formed areas, are highly resistant to corrosion, stress corrosion cracking, wear and galling.