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Detection of Cyanide Contamination in Ammoniacal Pd Solutions

IP.com Disclosure Number: IPCOM000061170D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Henning, TP: AUTHOR

Abstract

A low level of cyanide contamination in Pd plating baths results in plating defects. A technique to determine if low levels of cyanide are present in a Pd bath prevents defects.

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Detection of Cyanide Contamination in Ammoniacal Pd Solutions

A low level of cyanide contamination in Pd plating baths results in plating defects. A technique to determine if low levels of cyanide are present in a Pd bath prevents defects.

The technique utilizes a Hull cell plated with Ni, then Au to provide a uniform surface for testing. A Pt screen is used for the anode. The Au plated Hull cell panel is placed in the cell, and the cell is filled with the solution to be tested. The Hull cell panel is attached to the negative lead of the power supply and the anode to the positive lead. The panel was plated at 0.5 amperes for two minutes. A Hull cell agitator is used to achieve uniform plating.

After plating the panels are rinsed and blown dry. The panels are visually inspected for discontinuity in the appearance of the panels surface deposit. Where cyanide contamination exists, the panel will have a dull, flat gray appearance on the right-hand portion of the panel and a white satin or glossy appearance on the left-hand portion. The change in appearance is abruptly discontinuous.

As the level of cyanide contamination increases, the dull gray area is more extensively spread to the left side of the panel.

Panels plated in a like procedure in solutions that are uncontaminated from cyanide have a uniform color across the entire panel.

Cyanide levels as low as 0.062 ppm have been detected using this technique.

Anonymous.

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