Doctoral Dissertations

Jangsop Han

Abstract

“The influence of fluoride ion on zinc adherence to aluminum cathode blanks was determined.

The studies have shown a direct correlation between the fluoride content of zinc electrolyte and the degree of adherence of deposited zinc to aluminum. With higher fluoride contents, the number of initial nuclei was proportionally increased and the surface of the aluminum was rougher after zinc stripping, illustrating that the higher adherence of zinc was due to increased chemical and physical bonding of zinc to aluminum substrate. Even in solutions containing low fluoride, the cyclic usage of an aluminum cathode showed a similar effect to that of high fluoride, eventually resulting in strong adherence of zinc. SEM examinations revealed that the fluoride effect was accumulated during repetitions. Electrochemical tests demonstrated the instability of the oxide layer of aluminum in fluoride containing solution, which appeared to be the cause of zinc adherence.

Electrolytes containing antimony showed less tendency for zinc adherence and in turn fluoride counteracted the lowering of current efficiency related to antimony. The decreased adherence is thought to be related to enhanced hydrogen evolution and the simultaneous zinc dissolution caused by the intrinsic antimony effect”--Abstract, page iii.

Advisor(s)

O'Keefe, T. J. (Thomas J.)

Committee Member(s)

Robertson, D. G. C.
Watson, John L.
James, William Joseph
Kohser, Ronald A.

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Metallurgical Engineering

Comments

The author gratefully acknowledges the support of Korean government which made me initiate this research, financial and materials supports provided by the Big River Zinc Co., Sauget, Illinois at the early stage of this research and provided by the U.S. Department of Interior, Generic Center for Mineral Industry, Waste Treatment and Recovery, (University of Nevada), Grant No. G 1175132 (#2951) throughout the whole research period are also specially acknowledged.

Publisher

University of Missouri--Rolla

Publication Date

Spring 1990

Journal article titles appearing in thesis/dissertation

  • Electrochemical evaluation of zinc adherence to aluminum during electrowinning

Pagination

xviii, 130 pages

Note about bibliography

Includes bibliographical references.

Rights

© 1990 Jangsop Han, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type

text

Language

English

Thesis Number

T 6062

Print OCLC #

23228214

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