The Anodic Dissolution Of Tungsten

Author

James W. Johnson, Missouri University of Science and Technology
Cheng-Hsiao Wu, Missouri University of Science and Technology

Abstract

The anodic dissolution of tungsten was studied in H₂SO₄-K₂SO₄ solutions (pH = -2 to 2.5) and K₂SO₄-K₂CO₃-KOH solutions (pH = 11.5 to 14.5) at 25 C. Faradaic efficiency studies in basic solutions showed the metal to be oxidized to the +6 state. In acid solutions, a thick protective film of yellow WO₃ was formed. Polarization curves possessed linear Tafel regions (slope ~ 2.3 RT/F) at potentials 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. © 1971, The Electrochemical Society, Inc. All rights reserved.

Recommended Citation

J. W. Johnson and C. Wu, "The Anodic Dissolution Of Tungsten," Journal of the Electrochemical Society, vol. 118, no. 12, pp. 1909 - 1912, The Electrochemical Society, Jan 1971.

The definitive version is available at https://doi.org/10.1149/1.2407865

Department(s)

Chemical and Biochemical Engineering

Second Department

Electrical and Computer Engineering

Keywords and Phrases

anodic dissolution; corrosion; tungsten

International Standard Serial Number (ISSN)

1945-7111; 0013-4651

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 The Electrochemical Society, All rights reserved.

Publication Date

01 Jan 1971