Studies of Galvanic Corrosion Couples in Liquid Fluorine

Galvanic corrosion couples of several metals and alloys were tested in liquid fluorine at −320 F (−196 C), and the corrosion rates of the alloys were determined. A relative galvanic corrosion series, based on the rates, was developed as a guide for selecting materials for missile components exposed to fluorine containing propellants for long term storage. Electrode potentials of Al 1100 and copper versus a platinum reference electrode in liquid fluorine verify the general arrangement of the galvanic series. Evidence of pitting was found on Al 2014-T6 and silver coupons exposed to liquid fluorine.