Other

Macdermid, Incorporated

Macdermid Acumen, Inc.

Stacey Handy

Roderick Dennis Herdman

Trevor Pearson

Roshan V Chapaneri

Richard Tooth

Toshiyuki Yamamoto

Kotaro Ishiwata

Masahiro Hara

Tatsuya Nishiyama

The invention consists of a chromium electroplating solution comprising a chromium electroplating solution comprising: (1) a water soluble trivalent chromium salt; (2) at least one complexant for trivalent chromium ions; (3) a source of hydrogen ions sufficient to create a pH of from 2.8-4.2; (4) a pH buffering compound; and (5) a sulfur-containing organic compound. The chromium electroplating solution is usable in a method for producing an adherent metallic coating on a decorative article, such coating having enhanced resistance to corrosion in environments containing calcium chloride.

Chromium alloy coating with enhanced resistance to corrosion in calcium chloride environments

An aqueous acidic trivalent chromium electrolyte comprising trivalent chromium ions and a complexing agent for maintaining the trivalent chromium ions in solution is provided in which the aqueous electrolyte comprises additives capable of producing a coating on a substrate having a desired dark hue. The additives typically comprise a dispersion of colloidal silica and an additional additive selected from thiocyanate ions and/or iron ions. The electrolyte is used in a method of producing the desired dark-hued decorative chromium coating on a substrate by electrodeposition.

Dark colored chromium based electrodeposits

A plating process for plating chromium metal onto substrates is disclosed. The process uses a trivalent chromium plating bath with a sulfate and/or sulfonate matrix. The process also utilizes insoluble anodes. An addition of manganese ions to the plating bath inhibits the formation of detrimental hexavalent chromium ions upon use of the plating bath.

Process for plating chromium from a trivalent chromium plating bath

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West Midlands, United Kingdom

Stacey Handy