Atmospheric corrosion effects of HNO3—Comparison of laboratory-exposed copper, zinc and carbon steel
Atmospheric Environment(2007)
Abstract
The influence of nitric acid (HNO3) on the atmospheric corrosion of copper, zinc and carbon steel was investigated in laboratory exposures at 65% relative humidity (RH), 25°C and 0.03cms−1 air velocity. The deposition velocity (Vd) of HNO3 on the specimens, the corrosion rates and corrosion products were determined by gravimetry, ion chromatography, X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) microspectroscopy. Comparisons were also made with literature data on the corrosion effects of sulfur dioxide (SO2), nitrogen dioxide (NO2) and ozone (O3).
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Key words
Nitric acid,Materials degradation,Deposition velocity,Iron,Gerhardtite,Cuprite,Nitrate
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