STUDY OF HARD COATING FOR ALUMINUM ALLOYS

Abstract

A study was made of the effects of the hard oxide coatings produced by the Martin Hard-Coat process on the properties of 5 wrought and 2 cast Al alloys. Coating thicknesses ranged from 0.0005 to 0.005 in. The abrasion resistance of the coatings and the effect on the fatique strength of the parent metal were the most critical properties. The abrasion resistance substantially exceeded that of coatings produced by standard amodizing treatments and was equal to or better than that of thin cyanide coatings on steel. The coatings imparted corrosion resistance to Al alloy surfaces. The abrasion resistance decreased with exposure to humidity and atmospheric conditions; subsequent treatment, other than with boiling H2O which is used to seal anodized coatings, is expected to prevent the resistance decrease. The coatings lowered the fatigue strength of the metal by up to 65%; the decrease was not proportional to coating thickness.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1953
Accession Number
AD0014005

Entities

People

  • F. G. Gillig

Organizations

  • Calspan

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Aluminum Alloys
  • Base Metal
  • Chemistry
  • Coefficients
  • Corrosion
  • Corrosion Resistance
  • Crystal Structure
  • Dielectric Strength
  • Friction
  • Materials
  • Materials Laboratories
  • Plastic Explosives
  • Tensile Strength
  • Thermal Conductivity
  • Wear Resistance

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Mathematics or Statistics
  • Surface Engineering/Surface Coating Technology.