Investigation of the Possibilities for Electrochemical Control of Hot Corrosion Mechanisms
Final rept. Dec 1972-Dec 1973
LITTLE (ARTHUR D) INC CAMBRIDGE MA
Pagination or Media Count:
The effect of applied currents on the hot corrosion of nickel, pure Nichrome, Inconel 600, Hastelloy X, and a Co-Cr-Al-Y alloy in both sodium sulfate melts and a sodium sulfate seeded flame has been briefly investigated. In the molten salt bath, some evidence of anodic protection was observed with strip samples of the chromia forming alloys, Nichrome and Inconel 600. Polished spherical samples of Inconel 600 were not corroded by the molten salt until structural defects were introduced either by abrading the surface or by application of high anodic or cathodic currents. In the salt seeded flame, the rate of corrosion was affected very little by applied currents, probably because of the low current densities achievable in a flame system. Evidence was obtained for a difference in mechanism between anodically and cathodically polarized Nichrome samples, oxidation being more pronounced at the cathode and sulfidation at the anode.
- Properties of Metals and Alloys