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Browse Prior Art Database

Evaluating the Condition of Electroless Plating Baths

IP.com Disclosure Number: IPCOM000095824D
Original Publication Date: 1964-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Greene, KF: AUTHOR [+5]

Abstract

The condition of an electroless plating bath, i. e., the likelihood of spontaneous decomposition or plate out, is determined by measuring the change of potential difference between the object being plated and a reference electrode.

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Evaluating the Condition of Electroless Plating Baths

The condition of an electroless plating bath, i. e., the likelihood of spontaneous decomposition or plate out, is determined by measuring the change of potential difference between the object being plated and a reference electrode.

In a continuous electroless tape plating bath, tape 2, composed of material such as polyethylene terephthalate presensitized with stannous chloride and palladium chloride, is passed over idler roller 3 into electroless solution 4, around roller 5, out of the bath and over contact roller 6.

An electroless metal layer is deposited on tape 2 during the entire time it is in solution 4. The plated tape effectively becomes an electrode in a cell in which plating tank 7 of the upper drawing or reference electrode 8, lower drawing, is the other electrode.

In the situation in the upper drawing, the change of potential, as plating progresses, is due to both the change in nature of solution 4 and the deposition of metal on the inner surfaces of tank 7.

Where reference electrode 8 is used, as in the lower drawing, assuming that it is kept free of plated metal, the change of potential is substantially due to the change in the nature of solution 4.

The variation of potential difference is measured either continuously or from time to time. With a small amount of experimentation, the approach of spontaneous decomposition, in a given plating system, is readily determined.

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