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Quantitative Analysis of Citrate Ion in Electroless Deposition Baths

IP.com Disclosure Number: IPCOM000095196D
Original Publication Date: 1965-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Geist, T: AUTHOR [+2]

Abstract

Control of electroless deposition baths depends to a great extent upon maintaining a knowledge of the concentration of the various bath constituents.

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Quantitative Analysis of Citrate Ion in Electroless Deposition Baths

Control of electroless deposition baths depends to a great extent upon maintaining a knowledge of the concentration of the various bath constituents.

Automatic analysis of citrate ion, utilizing a TECHNICON AUTO ANALYZER*, is schematically shown. Analysis of citrate ion in, for example, a particular cobalt electroless deposition bath is made by running the bath through a manifold, introduced in line 3, with line 1 feeding in water. A standard bath, simulating the bath being analyzed, is also run through the manifold. This simulation is made possible by the introduction of phosphite ion in line 1 of the manifold.

In a metal anion hypophosphite cation type of electroless deposition bath, analysis of citrate ion is interfered with by the uncontrolled buildup of phosphite ion from the decomposition of the hypophosphite anion in the electroless deposition reaction. The more closely the standard simulates the electroless bath under analysis, especially in terms of phosphite ion concentration, the more accurate the colorimetric analysis is. In the analysis shown, the standard bath was as follows. *Trademark of Technicon Instruments Corporation. CoSO(4).7H(2)O 34.5 g/L.

NaH(2)PO(2).H(2)O 20 g/L

(NH(4))(2) SO(4) 66 g/L

Na(3)C(6)H(5)O(7).2H(2)O 17 5-32 5g/L

pH 9.0. Colorimetric comparison of the to-be-tested bath with the standard bath reveals the citrate ion concentration in the tested bath.

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