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Keywords:

  • aggressiveness of atmospheres;
  • alloy;
  • atmosphere corrosion;
  • kinetics parameters;
  • metal;
  • XRD

Abstract

According to ASTM G50-76, materials have been exposed to atmospheres of Saudi Arabia. Environmental factors such as temperature, relative humidity and deposition rates of pollutants (Cl and SO2) were investigated. X-ray diffraction was used for characterization. Corrosion rates were determined by weight loss. As per ISO 9223, aggressivity classification was made. The results obeyed well with the empirical kinetics equation of the form C = Ktn, where K and C are the corrosion losses in mg/cm2 after 1 and t years of the exposure, respectively, and n is constant. Based on n values, the corrosion mechanisms of samples are predicted.