The Compatibility of Welded Structural Materials with Chlorine Trifluoride, Perchloryl Fluoride and a Mixture of These

摘要

Compatibility and corrosion rates of nine welded alloys of aluminum, nickel and stainless steel, stressed and unstressed, in ClF3, ClO3F and 25% ClO3F-75% ClF3 at 30 and 66 C were investigated. Corrosion rates at 30 C were all less than 0.1 mil/yr. At 66 C, corrosion in ClF3 and Halox 25 was less than 0.1 mil/yr except for Type 410 S.S. (1-2.2 mil/yr). In ClO3F at 66 C corrosion was normally below 0.5 mil/yr, but with moisture present, rates up to 8.3 mil/yr were observed. No change in mechanical properties and no stress cracking due to oxidizer corrosion occurred. There was no interface corrosion. In an ambient temperature, high-pressure loop, liquid flows of ClF3 and ClO3F at 100 ft/sec through orfices in aluminum, nickel and stainless steel caused no erosion. A Teflon orifice was attacked by ClF3. Liquid impingement jets of ClF3 and ClO3F at 100 ft/sec had no effect on these metals except for a slight pit in aluminum 2014-T6 with ClF3. Liquid cavitation of ClF3 and ClO3F in an aluminum tube caused no metal change. (Author)