Accession Number : AD0709881

Title :   CORROSION AND POLARIZATION STUDIES OF Fe-Ni BINARY ALLOYS IN SULFURIC ACID SOLUTION AT 25C,

Corporate Author : AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Condit,Dale O.

Report Date : MAY 1970

Pagination or Media Count : 55

Abstract : The corrosion behavior of the Fe-Ni binary system, which is a base system for the stainless steels, was investigated using potentiodynamic polarization techniques. Both anodic and cathodic potential-current scans were conducted on ten high-purity Fe-Ni alloys. Several tests were conducted on each alloy to assure reliability of the data. Some of the data were analyzed using regression analysis to determine the kinetics involved in the anodic and cathodic processes. The anodic data indicate that active dissolution of Fe-Ni alloys is controlled by Fe in alloys containing up to and including 50 atomic per cent Ni. The cathodic data suggest that the evolution of hydrogen occurs by the formation of single atoms of hydrogen which coalesce to form the diatomic gas. Furthermore, as with anodic dissolution, the kinetics of the hydrogen reaction were found to nearly the same for high Ni alloys. The data from these experiments will provide a basis for determining the effect of (cl(-)) concentration on the corrosion behavior of Fe-Ni alloys, with specific interest in solving the stress corrosion problems in these alloys and in the stainless steels. (Author)

Descriptors :   (*IRON ALLOYS, *CORROSION), (*NICKEL ALLOYS, CORROSION), SULFURIC ACID, STRESS CORROSION, ELECTROCHEMISTRY, POLARIZATION

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE