The anodic dissolution of tungsten

Author

Ching-lun Wu

Abstract

"The anodic dissolution of tungsten was studied in H₂SO₄-K₂SO₄ solutions (pH= -2 to 2.5) andK₂SO₄-K₂CO₃-KOH solutions (pH = 11.5 to 14.5) at 25ºC. Faradaic efficiency studies in basic solutions showed that the metal was oxidized to the +6 state. In acid solutions, a thick protective film of yellow WO₃ was formed. Polarization measurements showed linear Tafel behavior (slope ~ 2.3RT/F) in the potential region slightly more positive than the rest potentials. An anodic dissolution mechanism is proposed which involves a surface film of W₂O₅ that is further oxidized to WO₃ and dissolves by hydrolyzation"--Abstract, page 1.

Advisor(s)

Johnson, James W., 1930-2002

Committee Member(s)

James, William Joseph
O'Keefe, T. J. (Thomas J.)

Department(s)

Chemical and Biochemical Engineering

Degree Name

M.S. in Chemical Engineering

Publisher

University of Missouri--Rolla

Publication Date

1970

Pagination

vi, 39 pages

Note about bibliography

Includes bibliographical references (pages 60-61).

Rights

© 1970 Ching-Lun Wu, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Tungsten -- Anodic oxidationFaraday effectElectrolytic oxidation

Thesis Number

T 2509

Print OCLC #

6029609

Electronic OCLC #

871717566

Recommended Citation

Wu, Ching-lun, "The anodic dissolution of tungsten" (1970). Masters Theses. 5471.
https://scholarsmine.mst.edu/masters_theses/5471