Infrared Detection of Chemical Corrosion on Metal Surface.
Final rept. 15 Jun 94-15 Mar 95,
AERODYNE RESEARCH INC BILLERICA MA
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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 Al3 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
- Inorganic Chemistry
- Physical Chemistry
- Properties of Metals and Alloys