Infrared Detection of Chemical Corrosion on Metal Surface.

Abstract

The sulfuric acid-induced corrosion of smooth (20 A average roughness) aluminum surfaces has been studied in real time using an in situ Fourier transform infrared reflection absorption spectrometer (IRAS) and a quartz crystal microbalance. Submicron-thick, 35 - 55 wt% (5- 12 molal), sulfuric acid films were formed on room temperature metal surfaces by the reaction of gas phase SO3 and H2O vapor in a flowing gas system at a total pressure of approx. 200 Torr. Using changes in spectral features that are linked to the production of Al(3+) as indicators of corrosion, we conclude the rate of corrosion of the metal is strongly enhanced by both higher relative humidities and increased rates of sulfuric acid deposition. Ex situ IRAS measurements on aluminum foils indicated that this technique is suitable for the detection of corrosion on metal surfaces. jg

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Document Details

Document Type
Technical Report
Publication Date
Mar 15, 1995
Accession Number
ADA295000

Entities

People

  • Andrew Freeman
  • Gary N. Robinson
  • Qing Dai

Organizations

  • Aerodyne Research

Tags

DTIC Thesaurus Topics

  • Acid Deposition
  • Aluminum
  • Aluminum Foil
  • Corrosion
  • Detection
  • Infrared Detection
  • Measurement
  • Measuring Instruments
  • Metals
  • Microbalances
  • Optical Detection
  • Quartz Crystal Microbalances

Readers

  • Combustion science or combustion engineering.
  • Materials Science and Engineering.
  • Spectroscopy.