Accession Number : AD0748297

Title :   Effect of Applied Electric Fields on the Mechanisms of Oxidation of Metals and Alloys.

Descriptive Note : Final rept. 17 Mar-17 Dec 71,

Corporate Author : LITTLE (ARTHUR D) INC CAMBRIDGE MASS

Personal Author(s) : Berkowitz,John B. ; Ketteringham,John ; Peters,Edward ; Sienczyk,John

Report Date : APR 1972

Pagination or Media Count : 46

Abstract : The effects of applied electrical potentials on the mechanisms of hot corrosion have been studied in a potassium sulfate seeded propane/air flame at temperatures of about 1200C. Experiments were carried out with Chromel A (Ni - 20 Cr), Nickel, molybdenum, and tungsten at potentials of 250V D.C. Currents were of the order of milliamps. Both the nature of the corrosion reactions and the rates were found to be functions of electrode polarity. Electron microbe analysis of the Chromel A samples indicated enhanced sulfidation at the anode and enhanced oxidation at the cathode. Alkali metal ions seemed to be strongly attracted to the cathode and repelled from the anode. Experiments up to 1000 volts with Chromel A showed decreased net corrosion at both electrodes. (Author)

Descriptors :   (*CORROSION INHIBITION, ELECTRIC FIELDS), (*GAS TURBINES, CORROSION INHIBITION), OXIDATION, TUNGSTEN, NICKEL, NICKEL ALLOYS, CHROMIUM ALLOYS, SALTS, SODIUM CHLORIDE, SULFUR COMPOUNDS, FLAMES, ALKALI METALS, MOLYBDENUM, POLARIZATION, SULFIDES, ELECTROCHEMISTRY, MICROSTRUCTURE

Subject Categories : Properties of Metals and Alloys
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE