Masters Theses

Abstract

"The rate of dissolution of polycrystalline beryllium was studied in hydrofluoric, hydrochloric and sulfuric acids. Two samples of beryllium containing different amounts of beryllium oxide were used. The experiments were performed at temperatures ranging from 20 to 50°C, and at various acid concentrations. The kinetics of these heterogeneous processes conformed to a reaction order of approximately one in all the cases. Since the conditions of the surface were complex during dissolution, these might complicate the reaction. This might be due to the oxide layer, which is present as impurity.

The difference effect was determined at various acid concentrations at 25°C using a beryllium-platinum cell. The difference effect in the initial stages was directly proportional to the galvanic current. At higher current densities, the difference effect declined slightly from a linear relationship. A very strong positive difference effect was observed for beryllium dissolving anodically in hydrofluoric acid. The value of the proportionality constant K was higher than 6.97.

The two beryllium samples differed markedly in their behavior in hydrochloric acid, exhibiting the negative and the positive difference effect. The beryllium reacted with hydrochloric acid forming chunks which were visible to the unaided eye.

In sulfuric acid, a positive difference effect was observed with the values of K well below 6.97.

The apparent valence of beryllium ions going into solution during anodic dissolution was calculated. This resulted in ionic charges of extremely high and low values. It was thus concluded that the normal valence of beryllium ions does not change under these conditions"--Abstract, pages ii-iii.

Advisor(s)

Straumanis, Martin E., 1898-1973

Committee Member(s)

Larson, Andrew H.
Johnson, James W., 1930-2002
Webb, William H.

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering

Sponsor(s)

U. S. Atomic Energy Commission

Publisher

Missouri School of Mines and Metallurgy

Publication Date

1962

Pagination

xiii, 188 pages

Note about bibliography

Includes bibliographical references (pages 186-187).

Rights

© 1962 Daniel Santhamurthi Gnanamuthu, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Beryllium
Beryllium -- Dissolution -- Testing
Chemical kinetics
Hydrofluoric acid

Thesis Number

T 1384

Print OCLC #

5937975

Electronic OCLC #

982486750

Comments

Financial assistance of the United States Atomic Energy Commission, Contract AT (11-1) 73, Project 5.

The manuscript does not include page 168.

Included in

Metallurgy Commons

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