Electrochemical Studies of Passive Film Formation and Corrosion of Friction Stir Processed Nickel Aluminum Bronze

Abstract

The Navy currently uses Nickel-Aluminum Bronze (NAB) for its propellers. Friction stir processing (FSP) is a proposed method of improving the mechanical properties of NAB, and it is believed to improve the corrosion-resistive properties of NAB. This thesis used multiple techniques to compare the corrosion resistance of as-cast NAB with FSP NAB. Passive films were grown on the as-cast (AC) and FSP samples and modeled in order to relate the impedance data to changes in phase and microstructure resulting from FSP of NAB. Impedance modeling provides a way of measuring the passive film that forms on a metal and protects it from corrosion. In addition, cyclic polarization data was taken in order to study the stability of the films over a range of potentials. This data was then compared with SEM images to link the changes in the passive films with the changes in microstructure that occurred due to FSP.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2011
Accession Number
ADA547917

Entities

People

  • Peggy S. Legrand

Organizations

  • Naval Postgraduate School

Tags

DTIC Thesaurus Topics

  • Chemical Reactions
  • Chemical Synthesis
  • Chemistry
  • Corrosion
  • Corrosion Resistance
  • Crystal Structure
  • Elements
  • Friction Stir Processing
  • Friction Stir Welding
  • Impedance
  • Materials
  • Mechanical Properties
  • Metals
  • Microscopy
  • Resistance
  • United States
  • United States Naval Academy

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Metallurgy
  • Systems Analysis and Design