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Effects of Film Stress on the Chemical Mechanical Polishing Process
Home
Publications
Effects of Film Stress on the Chemical Mechanical Polishing Process
Effects of Film Stress on the Chemical Mechanical Polishing Process
WT
Wei‐Tsu Tseng
Wei‐Tsu Tseng
YW
Yiao‐Hsien Wang
Yiao‐Hsien Wang
JC
Jyh‐Hwa Chin
Jyh‐Hwa Chin
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1 November 1999
journal article
Published by
The Electrochemical Society
in
Journal of the Electrochemical Society
Vol. 146
(11)
,
4273-4280
https://doi.org/10.1149/1.1392627
Abstract
Lead alloys, such as lead‐calcium‐tin and lead‐silver, are the primary insoluble anodes used in the electrowinning of metals. While some difficulties are encountered in their use, there is no obvious replacement that is economically and technically competitive. Two of the specific problems with lead include decreased cathode purity due to incorporation from corrosion products and the relatively high overpotential which increases cell voltage. To gain an improved understanding of the fundamental behavior of lead anodes, the polarization behavior of six different alloys in sulfuric acid was evaluated. Some tests were also made with Co(II) in the acid sulfate electrolyte. Notable differences were found in the multiple activation‐passivation cycles, stability, and relative activity for oxygen evolution for the alloys, and the relative trends in behavior were established. Electrochemical impedance spectroscopy studies were also conducted at selected potentials. Overall, the data show that the electrochemical response, particularly the degree of polarization for the oxygen evolution reaction, of the lead alloy anodes are dependent on the surface phases and structures present. The ability to depolarize the anode reaction using Co(II) was particularly sensitive to the lead composition. © 1999 The Electrochemical Society. All rights reserved.
Keywords
BEHAVIOR
STRESS
EVOLUTION
POLARIZATION
ALLOYS
OXYGEN
STRUCTURES
ANODES
LEAD ALLOY
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Open Access
Cited by 30 articles