Corrosion Protection of Metal Matrix Composites

Abstract

Corrosion protection of Al alloys, Al-based metal matrix composites (MMCs), and Al-Li alloy by conversion coatings, anodized layers, polymer coatings, and chemical passivation in CeCl3 has been evaluated in a simulated marine environment (0.5 N NaCl) by electrochemical impedance spectroscopy (EIS). Conversion coatings, anodizing, polymer coatings have been evaluated for MgAZ31B. Chromate conversion coatings (Alodine 600) provided corrosion protection for Al/SiC and Al/Gr MMCs, but were not as effective as for Al 6061. For Al/SiC it was observed that sulfuric acid anodizing did not produce the corrosion resistance obtained for the Al 6061. The corrosion resistance for hard anodized Al/SiC was less than that for conventional anodized Al/SiC. Keywords: Corrosion protection, Polymer coatings, Conversion coatings, Anodizing Al alloys, Magnesium, Localized corrosion, Passivation, Electrochemical techniques.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1990
Accession Number
ADA222951

Entities

People

  • F. Mansfeld
  • H. Shih
  • Sharon Lin

Organizations

  • University of Southern California

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Chemical Synthesis
  • Chemistry
  • Chromium Compounds
  • Coatings
  • Composite Materials
  • Corrosion Resistance
  • Epoxy Coatings
  • Frequency
  • Impedance
  • Material Degradation Processes
  • Materials
  • Materials Processing
  • Materials Science
  • Metal Matrix Composites
  • Resistance
  • Spectra
  • Spectroscopy

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials
  • Surface Coatings Technology.