"Beryllium was shown to react stoichiometrically with HF, HCl, and H2SO4 acids in accordance with a plus two valence. These reactions were investigated by the hydrogen evolution method.
Dissolution rates were determined in five concentrations, 0.01, 0.05, 0.10, 0.50, and 0,75 N, of HF acid at 10, 20, 30, 40 and 50°C, This was accomplished by the hydrogen evolution method and the results were based on the tested stoichiometry. Beryllium has a high dissolution rate in HF acid, which approximates the following under similar conditions: 10 times Al, 4 times Ti, and 1.5 times Zr. A kinetic evaluation of the dissolution results revealed a reaction order of 0.88 and an activation energy of 6.8 Kcal/mole, Unfortunately, due to the existence of complex surface conditions, these values proved to be inadequate to deduce a conclusive mechanism for the reaction. However, a tentative hypothesis is offered which assumes a diffusionally controlled process that is hindered by a BeO film. Future studies involving potential and difference effect measurements should prove effectual in developing an explanation of this reaction.
A preliminary investigation of the HCl dissolution reaction revealed a very different mode of attack which appeared to be primarily electrochemical. A most interesting feature of this reaction was its capacity to exhibit the phenomenon known as the "chunk effect”. This resulted in fragments of the beryllium being dislodged into the solution during attack by the dilute acid. Limited dissolution rate data for this reaction indicated it to be more complex than for the HF acid reaction.
A review of the literature revealed no evidence of previous quantitative corrosion studies on beryllium in the above three acids"--Abstract, pages ii-iii.
Straumanis, Martin E., 1898-1973
James, William Joseph
Troutner, David E.
Leighly, Hollis P., 1923-2004
Materials Science and Engineering
M.S. in Metallurgical Engineering
U. S. Atomic Energy Commission
Missouri School of Mines and Metallurgy
viii, 100 pages
© 1961 Donald Lee Mathis, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Beryllium -- Dissolution -- Testing
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Mathis, Donald Lee, "A dissolution rate study of beryllium in hydrofluoric acid" (1961). Masters Theses. 4174.