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Effects of NaCl, SO 2 , NH 3 , O 3 , and ultraviolet light on atmospheric corrosion of Zn
Author(s) -
Onye Jermain,
Frankel Gerald S.
Publication year - 2020
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201911052
Subject(s) - corrosion , relative humidity , zinc , ultraviolet , fourier transform infrared spectroscopy , chemistry , metal , irradiation , spectroscopy , nuclear chemistry , materials science , inorganic chemistry , metallurgy , chemical engineering , meteorology , physics , optoelectronics , quantum mechanics , nuclear physics , engineering
The atmospheric corrosion behavior of Zn was studied in laboratory environments containing constituents that have not previously received much attention, in particular, humidity, SO 2 , 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.