Accession Number:

AD0818667

Title:

HALOGEN PASSIVATION STUDIES.

Descriptive Note:

Quarterly progress rept. no. 3, 1 May-31 Jul 67,

Corporate Author:

DOUGLAS AIRCRAFT CO INC NEWPORT BEACH CA ASTROPOWER LAB

Report Date:

1967-08-01

Pagination or Media Count:

74.0

Abstract:

Experiments were carried out to further define the reaction of fluorine gas with typical system contaminants during passivation processes. Tests have shown that residues of certain organic materials are shock sensitive in LF2, even after passivation at pressures as high as 200 psig. Such evidence implies that it is dangerous to assume that passivation processes can be relied upon for final cleanup of systems that have not been properly cleaned before assembly. Accelerated corrosion tests of metals in wet HF vapor have shown that passivated surfaces are slightly more prone to corrosion than unpassivated surfaces. Thorough purging or evacuation of passivated surfaces can reduce the amount of secondary corrosion. Mechanical stability tests of passivated stainless steel bellows have indicated that little loss of fluoride film occurs under rigorous conditions of thermal shock and flexing. An investigation has been made of the amount of HF produced during passivation in a closed system containing known small quantities of hydrocarbons. Author

Subject Categories:

  • Fabrication Metallurgy
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE