Accession Number : AD0732200

Title :   Potentiodynamic Polarization Behavior of Fe-25 Ni in (C1(-)) Containing IN H2SO4.

Descriptive Note : Final rept.,

Corporate Author : AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Condit,Dale O.

Report Date : JUL 1971

Pagination or Media Count : 43

Abstract : The polarization behavior of a high purity Fe-25Ni was determined as a function of the chloride ion (Cl(-)) concentration in a 1NH2SO4 solution. The anodic Tafel slopes were increased while the cathodic Tafel slopes were unchanged by increases in the (Cl(-)) concentration. However, a parallel shift in the cathodic curve in the noble potential direction was noted. Except for the increase in the anodic Tafel slopes, the active portion of the polarization curves were unaffected by the presence of (Cl(-)) concentration. At concentrations between 300 and 400ppm rapid changes in the passive current density were observed. At concentrations greater than about 400 ppm, the passive state was no longer exhibited; dissolution of the alloy occurred continuously throughout the anodic polarization test. (Author)

Descriptors :   (*IRON ALLOYS, *STRESS CORROSION), (*ELECTROCHEMISTRY, IRON ALLOYS), NICKEL ALLOYS, CRACKS, LIQUID IMMERSION TESTS, CHLORIDES, POLARIZATION, HEAT OF ACTIVATION

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE