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Title: Metallic corrosion in the polluted urban atmosphere of Hong Kong
Authors: Liu, B
Wang, DW
Guo, H 
Ling, ZH
Cheung, K
Keywords: Metallic corrosion
Acidic particles
Corrosion rate
Polluted urban atmosphere
Issue Date: 2015
Publisher: Springer
Source: Environmental monitoring and assessment, 2015, v. 187, 4112 How to cite?
Journal: Environmental monitoring and assessment 
Abstract: This study aimed to explore the relationship between air pollutants, particularly acidic particles, and metallic material corrosion. An atmospheric corrosion test was carried out in spring-summer 2012 at a polluted urban site, i.e., Tung Chung in western Hong Kong. Nine types of metallic materials, namely iron, Q235 steel, 20# steel, 16Mn steel, copper, bronze, brass, aluminum, and aluminum alloy, were selected as specimens for corrosion tests. Ten sets of the nine materials were all exposed to ambient air, and then each set was collected individually after exposure to ambient air for consecutive 6, 13, 20, 27, 35, 42, 49, 56, 63, and 70 days, respectively. After the removal of the corrosion products on the surface of the exposed specimens, the corrosion rate of each material was determined. The surface structure of materials was observed using scanning electron microscopy (SEM) before and after the corrosion tests. Environmental factors including temperature, relative humidity, concentrations of gaseous pollutants, i.e., sulfur dioxide (SO?), nitrogen dioxide (NO?), carbon monoxide (CO), ozone (O?), and particulate-phase pollutants, i.e., PM?.? (FSP) and PM?? (RSP), were monitored. Correlation analysis between environmental factors and corrosion rate of materials indicated that iron and carbon steel were damaged by both gaseous pollutants (SO? and NO?) and particles. Copper and copper alloys were mainly corroded by gaseous pollutants (SO? and O?), while corrosion of aluminum and aluminum alloy was mainly attributed to NO? and particles.
ISSN: 0167-6369
EISSN: 1573-2959
DOI: 10.1007/s10661-014-4112-z
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