Enthone Incorporated

Bethlehem Steel Corporation

Other

Yung-Herng Yau

Joseph Anthony Abys

Karl F Wengenroth

Thomas B Richardson

Chonglun Fan

Chen Xu

John Fudala

Anthony Fiore

Richard N Steinbicker

Herbert E Townsend

Edward J Kudrak

Cai Wang

Pingping Ye

Xingping Wang

Robert Farrell

Edward S Fodor

Compositions and methods for silver plating onto metal surfaces such as PWBs in electronics manufacture to produce a silver plating which is greater than 80 atomic % silver, tarnish resistant, and has good solderability.

Silver plating in electronics manufacture

A method is provided for depositing a whisker resistant tin-based coating layer on a surface of a copper substrate. The method is useful for preparing an article comprising a copper substrate having a surface; and a tin-based coating layer on the surface of the substrate, wherein the tin-based coating layer has a thickness between 0.5 micrometers and 1.5 micrometers and has a resistance to formation of copper-tin intermetallics, wherein said resistance to formation of copper-tin intermetallics is characterized in that, upon exposure of the article to at least seven heating and cooling cycles in which each cycle comprises subjecting the article to a temperature of at least 217&#xb0; C. followed by cooling to a temperature between about 20&#xb0; C. and about 28&#xb0; C., there remains a region of the tin coating layer that is free of copper that is at least 0.25 micrometers thick.

Immersion tin silver plating in electronics manufacture

Incorporating an additive into a tin electroplating bath substantially inhibits soluble ferrous ions, ferric ions, and stannous ions from reacting thus minimizing the formation of stannic tin which is lost in the plating sludge.

Ferrocyanide-free halogen tin plating process and bath

The invention relates to an improvement in a process for electrodepositing a protective coating of zinc or a zinc alloy on steel or other metal substrates in which the process utilizes a metal conductor roll or conductor roll with metal sleeves and contains a rinsing bath with a mineral acid solution associated with the roll, the improvement comprises providing at least 50 ppm of hydrogen peroxide or a peroxydisulfate compound in the mineral acid bath.

Process for improving wear on conductor rolls in electroplating of steel

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Allentown, PA, United States of America

Yung-Herng Yau