Allen Craig Jones

US Patent:

47311665, Mar 15, 1988

Filed:

Jan 12, 1986

Appl. No.:

6/929923

Inventors:

Allen R. Jones - Belford NJ

Assignee:

M&T Chemicals Inc. - Woodbridge NJ

International Classification:

C25D 536

US Classification:

204 34

Abstract:

An adherent, smooth electrodeposit of chromium is produced on a nodular cast iron substrate from a chromium plating bath. The desired deposit is provided herein by activating the substrate, subjecting the activated substrate to an ultrasonic treatment, and thereafter plating chromium from a chromium plating bath. The method is particularly effective for electrodeposition of chromium on such substrates from commercial high energy efficient chromium electroplating baths, where ordinarily only roughened deposits are obtained.

US Patent:

46683488, May 26, 1987

Filed:

Sep 26, 1985

Appl. No.:

6/780469

Inventors:

Allen R. Jones - Belford NJ
Hyman Chessin - Brick NJ

Assignee:

M&T Chemicals Inc. - Woodbridge NJ

International Classification:

C25D 536

US Classification:

204 34

Abstract:

An activation solution is provided for forming adherent chromium electrodeposits on metal substrates, preferably ferrous metals such as cast iron, from high energy efficient chromium baths. The solution suitably is a mixture of sulfuric acid, added sulfate ion, and an inorganic oxidizing agent. A preferred solution contains 10 to 40% by volume concentrated sulfuric acid, 100 to 200 grams per liter of magnesium sulfate heptahydrate and 1 to 2 grams per liter of sodium nitrate.