Passivation of carbon steel using encapsulated oxygen
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United States of America Patent
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Feb 6, 1996
Issued Date -
N/A
app pub date -
Aug 25, 1994
filing date -
Oct 29, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A protective passive oxide layer is formed on the inner surfaces of metal heat pipes or tubes including their end caps, welds and accompanying hardware through the use of an oxygen encapsulation method. After cleaning the tube and its accompanying parts, the tube is reassembled and existing gases within the tube are removed thereby creating a vacuum inside the tube. The tube is then filled with pure oxygen and sealed. After the oxygen is sealed within the tube, the sealed tube is heated thereby forming a passive oxide layer, such as magnetite (Fe.sub.3 O.sub.4) on the inner surface of the tube.
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