1,721,037 research outputs found
DEGRADATION ASSESSMENT OF POLYMERS FOR BIOMEDICAL APPLICATIONS UNDER STERILIZATION CONDITIONS
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Spectroscopic and mechanical properties of dental resin composites cured with different light sources.
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FTIR study on the amorphous corrosion products of galvanized steel in carbonated concrete
No full textThe composition and the structure of the passivating products of galvanized steel
after concrete carbonation and wet-dry cycles in tap water were studied. The research
was performed on mild steel sheets galvanized in a pure zinc bath and then
embedded in cubic concrete specimens. After 39 days of air curing, the specimens
were placed in a carbonation chamber and then were submitted to wet-dry cycles in
tap water. After different periods of time, some concrete specimens were broken and
the sheets were removed and submitted to scanning electron microscopy, energy
dispersive X-ray analysis and Fourier transform infrared spectroscopy. The results
confirm that concrete carbonation leads to the destruction of the passivating layer of
calcium hydroxyzincate with formation of amorphous compounds. FTIR spectra indicate
that these compounds are ZnCO3 and hydrozincite, with a prevailing presence of
the former. SEM observations of the coating cross-sections confirm the results of
previous corrosion rate measurements, which indicate that zinc remains passive both
during concrete carbonation and during the subsequent wet-dry cycles in tap water.
After 19 wet-dry cycles only to a slight decrease of the amount of the corrosion products
on the coating surface was found by means of SEM observation and FTIR spectroscopy
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