The Properties of Anodic Aluminum Oxides, II. A Study of the Surface Roughness

Abstract

A method for determining the ratio of true surface area to apparent surface area has been developed which may be applied to smooth metal foils of only 200 square centimeters apparent area. For rougher foils proportionately less may be used. The method involves the adsorption of ethylene on the foil at -183 deg C. A new type of adsorption isotherm is found for most adsorbents. The method promises to be useful in the study of the preparation of metal surfaces for optimum paint adhesion, in the study of conversion coatings for similar purposes and in the general study of corrosion phenomena. Surfaces of anodized aluminum are found to be very rough. Their very large surfaces are consistent with the pore theory of anodic film structure and account for the excellent adhesion of paint to these surfaces.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1947
Accession Number
AD1204081

Entities

People

  • P. A. Smudski
  • R. L. Jr Burwell
  • T. P. May

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Aluminum Oxides
  • Boiling Point
  • Chemical Synthesis
  • Chemistry
  • Gases
  • Heat Energy
  • Isotherms
  • Kinetic Theory
  • Liquids
  • Materials
  • Materials Processing
  • Materials Science
  • Mean Free Path
  • Measurement
  • Protective Coatings
  • Surface Roughness

Readers

  • Materials Science and Engineering.
  • Surface Coatings Technology.