The Role of Moisture and Hydrogen in Hot-Salt Cracking of Titanium Alloys Page: 3 of 42
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I. ABSTRACT
The role of moisture and hydrogen in the stress corrosion
cracking of Ti-BAI-lMo-1V exposed to hot chloride salts was inves-
tigated. The adsorption and retention of moisture during the
application of salt deposits and subsequent heating, and the
extent of HCi and hydrogen generation during corrosion were studied
using radiotracer techniques and mese spectrographic analyses of
volatile corrosion products. Hot-stage microscopy and cinemato-
graphy were used to study crack initiation and propagation, and the
characteristics of fracture surfaces were examined by electron
fractography, The effects of NaCl were compared to those of
SnCl2-2H0, which not only retains much more moisture but also has
a much lower melting point than NaCl. These studies revealed an
obvious association between the occurence of cracking and the
amounts of HG] and hydrogen generated during hot-salt corrosion.
This, combined with results of supplementary experiments using sodi-
um iodide and bromide, indicates that hydrogen, rather than the
halide, plays the key role in the cracking process, The observations
are consistent with a stress-sorption mechanism for cracking, in
which corrosion-produced nascent hydrogen is proposed to be the
sorbed species responsible for cracking.- 2 -
i
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Rideout, S.P. The Role of Moisture and Hydrogen in Hot-Salt Cracking of Titanium Alloys, report, January 6, 2003; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc740800/m1/3/: accessed May 4, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.