2.5. Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR)

ATR-FTIR spectra were collected using a PerkinElmer Spectrum 100 series FTIR spectrometer in the mid-IR range from 4000 to 400 cm^–1. The spectra were collected for the intact silane deposited on the steel surface, the residue of the biotic medium, and the corrosion product film that developed on the silane-coated specimen pre-exposed to the anaerobic chloride solution with SRB (biotic). For each test, 64 scans were performed with a spectral resolution of 4 cm^–1. Prior to the collection of FTIR spectra, background scans were performed to be subtracted from the collected FTIR spectra.