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Improved Hydrogen Measurement in Molten Aluminum and Aluminum Alloys

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Improved Hydrogen Measurement in Molten Aluminum and Aluminum Alloys

D. Corleen Chesonis, Alcoa Technical Center, Cressona, USA
Todd M. Gansemer, Alcoa Davenport Works, Bettendorf, USA
Brian C. Reynolds, Alcoa Davenport Works, Bettendorf, USA
Jim N. Hart, Alcoa Technical Center, Cressona, USA

Track: BILLET PROCESS and EQUIPMENT - Metal Quality

ABSTRACT --- The hydrogen content of molten aluminum and aluminum
alloys can be measured in-line using equipment such as Alscan, Telegas, or
Notorp or by laboratory methods such as LECO Nitrogen Carrier Fusion or Hot
Vacuum Subfusion Extraction (HVE). It is generally recognized that differing
hydrogen results can be obtained when different methods are used. The Alscan
method is an established in-line measurement technique, but it has been observed
to have a bias relative to other methods that produces higher hydrogen
measurements. The extent of this bias appears to depend on ambient humidity
and temperature. An explanation for the bias has been discovered and an
equipment modification to eliminate the bias has been developed. This
equipment modification has been extensively tested through comparisons with
Notorp and LECO.


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