Effects of NaCl,SO2, NH3, O3, and ultraviolet light on atmospheric corrosion of Zn |
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| Authors: | Jermain Onye Gerald S Frankel |
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| Affiliation: | Department of Materials Science and Engineering, Fontana Corrosion Center, The Ohio State University, Columbus, Ohio |
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| Abstract: | The atmospheric corrosion behavior of Zn was studied in laboratory environments containing constituents that have not previously received much attention, in particular, humidity, SO2, NH 3, and O 3, along with ultraviolet (UV) light irradiation and a preloading of NaCl. After exposure, corrosion rates were measured using mass loss, and corrosion products were identified by X-ray diffraction, Fourier transform-infrared spectroscopy, and energy dispersive spectroscopy. In this study, UV light and O 3 did not significantly affect the Zn corrosion rate in the absence of Cl ?. However, when NaCl was present, UV light inhibited the Zn corrosion rate below 90% relative humidity (RH) and accelerated the Zn corrosion rate at 99% RH. The presence of UV light also increased the formation of zinc hydroxyl sulfate and gordaite when exposed to 120 parts per billion (ppb) SO 2 and NaCl. The combination of SO 2 and O 3 with the preloading of NaCl increased the corrosion rate of Zn compared with NaCl alone. NH 3 at a concentration of 550 ppb did not have a significant effect on the Zn corrosion rate. |
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| Keywords: | ammonia atmospheric corrosion ozone sodium chloride sulfur dioxide ultraviolet light zinc |
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