Environmental Integrity of Coating/Metal Interface

Abstract

It is the objective of this project to establish the molecular details of the corrosion-induced loss of adhesion of organic films from steel. Scanning acoustic microscopy (SAM) has allowed observation of the microscopic details of the attack of cathodic corrosion products on a model organic coating on steel. Attack of the polymer by the alkaline corrosion products occurs at numerous localized regions resulting in the mechanical degradation of the coating/metal interface. Acoustic microscopy has also provided a rapid determination of the kinetics of the disbonding process. The disbond distance away from a cathodically polarized scribe increases with the square root of time. The corresponding rate parameter Kd increases with increasing potential for applied potentials below -750 mV vs Ag/AgCl.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1989
Accession Number
ADA207123

Entities

People

  • J. Lumsden
  • M. Kendig
  • P. Stocker

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Auger Electron Spectroscopy
  • Auger Electrons
  • Chemical Synthesis
  • Chemistry
  • Coatings
  • Current Density
  • Electron Spectroscopy
  • Electrons
  • Hydrophilic Properties
  • Materials
  • Metal Oxides
  • Microscopy
  • Organic Coatings
  • Polymer Degradation
  • Spectra
  • Surface Analysis
  • Surface Energy

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Nanocomposite Materials Science
  • Structural Health Monitoring of Composite Structures.