Environmentally-Induced Passivity of Aluminum Alloys and Aluminum Metal Matrix Composites

Abstract

This final report presents a summary of the work performed under Contract No. N00014-88-K-0034. One of the goals of the research carried out was to develop corrosion protection methods for Al-based materials which can replace the presently used chromate conversion coatings with modified surface layers of equal or even better resistance to localized corrosion. The past work first evaluated the use of rare earth metal chlorides (REMC) for the passivation of Al alloys and Al/SiC by a simple immersion treatment. Very corrosion resistant surfaces have been obtained in this manner which did not show any localized corrosion during exposure to aerated NaCl for periods up to 60 days. In an attempt to shorten the passivation time, a passivation treatment in solutions of CeCl3, and Ce(NO3)3 has been developed. Very corrosion resistant surfaces have been produced in a process in which immersion in CeCl3 and Ce(NO3)3 was followed by an electrochemical treatment in Na2MoO4.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1990
Accession Number
ADA231350

Entities

People

  • Florian Mansfeld

Organizations

  • University of Southern California

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Aluminum
  • Anodic Polarization
  • Auger Electrons
  • Body Weight
  • Capacitance
  • Composite Materials
  • Corrosion
  • Corrosion Resistance
  • Crystal Structure
  • Material Degradation Processes
  • Materials
  • Materials Science
  • Metal Matrix Composites
  • Oxide Films
  • Square Waves
  • Surface Analysis
  • Surface Properties

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Systems Analysis and Design