THE POROSITY OF PROTECTIVE FILMS ON MILD STEEL

Abstract

Techniques were developed for investigation of the porosity of protective films formed in a mild steel-15% NaOH (aqueous) system at 316C. The apparent porosity and uniformity of the film were determined by hydroxyl ion transport, gas (helium and argon) flow and light transport through the film. Specifically, optical, gas flow, and pore volume per surface area measurements were used to estimate the mean pore size. A comparison of the results from the three methods established an estimated value of 0.1 to 7.0 microns for the mean pore diameter.

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Document Details

Document Type
Technical Report
Publication Date
Dec 31, 1968
Accession Number
AD0682935

Entities

People

  • T. A. Kovacina

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Chemistry
  • Diameters
  • Diffusion
  • Dosage Forms
  • Films
  • Flow
  • Fluids
  • Gas Flow
  • Material Degradation Processes
  • Materials
  • Measurement
  • Osmotic Pressure
  • Oxide Films
  • Oxides
  • Physical Properties
  • Porosity
  • Porous Materials

Readers

  • Combustion and Flow Dynamics.
  • Materials Science and Engineering.
  • Surface Engineering/Surface Coating Technology.