Corrosion resistance of galvanized roofing sheets in acidic and rainwater environments
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CellPress
Abstract
Description
The galvanization of steel sheets for building roofs and construction of additional structures has been a valued
solution to the challenges faced by the deterioration of roofing steel sheets in an unfavourable surroundings. This
research was conducted on galvanized roofing sheets obtained from the open market in Nigeria. The samples were
cut to a small size (5 cm by 4 cm) and immersed in sulfuric acid (H2SO4) and hydrochloric acid (HCl). As the
control medium for the experiment, rainwater was used. The experiment was performed over 1200 hours; each
sample was removed every 240 hours, thoroughly washed, dried, and weighed again. Based on the reacting
media, variations in the weights of the samples were obtained. According to ASTM G1-03 standard practice,
Corrosion rates were calculated for preparing, cleaning, and evaluating corrosion test specimens. Scanning
electron microscopy/energy dispersive spectroscopy (SEM/EDS) was also carried out. Although some samples
resisted corrosion, other samples corroded. It is predicted that the green-coated samples are more resistant to
corrosion in rainwater and H2SO4 and thus more stable.
Keywords
TJ Mechanical engineering and machinery, TP Chemical technology