Michael Malik

US Patent:

20090242081, Oct 1, 2009

Filed:

Mar 26, 2008

Appl. No.:

12/055539

Inventors:

Richard Bauer - Howell MI, US
Michael Malik - Livonia MI, US

International Classification:

C23C 22/30
C23C 22/44

US Classification:

148267, 148 22, 148243, 148275

Abstract:

An aqueous conversion coating composition for treating metal substrates such as aluminum, aluminum alloys, zinc, zinc alloys, magnesium, magnesium alloys and steel to provide a conversion coating thereon. The conversion coating composition comprises a) a source of aluminum ions; b) a fluoro compound; c) at least one pH adjuster; d) a source of Group VIB metal ions selected from the group consisting of tungstate ions and trivalent chromium ions; and e) optionally, a preservative. The conversion coating composition provides a corrosion resistant coating on the metal surface and improves the adhesion of subsequently applied layers.

US Patent:

46596054, Apr 21, 1987

Filed:

May 16, 1984

Appl. No.:

6/610684

Inventors:

Michael Malik - Livonia MI
Joseph L. Greene - Highland MI

Assignee:

Richardson Chemical Company - Des Plaines IL

International Classification:

H01F 1002

US Classification:

427129

Abstract:

A process for producing a high density magnetic storage device such as a rigid memory disc having improved magnetic recording properties including high coercivity, high remanence and improved hysteresis loop squareness. The device is prepared by initially cleaning the surface of a substrate, such as an aluminum disc, zincating that cleaned surface, when applicable electrolessly depositing a non-magnetic, nickel-phosphorus layer thereon which is substantially free of pits and other surface imperfections and which has a nickel content of from approximately 88 to 92 percent and a phosphorus content of from 12 to 8 percent, by weight. The non-magnetic, nickel-phosphorus layer is then polished and a magnetic, cobalt-phosphorus layer electrolessly deposited thereon. The cobalt-phosphorus deposition is performed in a highly stable, ammonia-free bath containing a source of cobalt ions, a source of hypophosphite ions, a source of citrate ions, and a low molecular weight, bath soluble amino acid. Preferably, a buffering agent such as, for example, a borate is employed in the bath.