TY - JOUR
T1 - Effects of Biochar Nanoparticles on Anticorrosive Performance of Zinc-rich Epoxy Coatings
AU - Li, Ziyou
AU - Ravenni, Giulia
AU - Bi, Huichao (Teresa)
AU - Weinell, Claus Erik
AU - Ulusoy, Burak
AU - Zhang, Yanqiang
AU - Dam-Johansen, Kim
PY - 2021
Y1 - 2021
N2 - Biochar nanoparticles (BCN) derived from spruce wood and wheat straw were prepared, characterized and incorporated into zinc-rich epoxy coatings, with the aim of improving the zinc powder utilization and the anticorrosion performance. Formulations with different BCN and commercial carbon black dosages (0.4wt.%, 0.8wt.% and 1.6wt.%) were compared to a zinc-rich epoxy paint (ZRP) without carbon addition. After immersion and salt spray exposure, coated steel panels were characterized with optical, electrochemical and spectroscopy techniques to evaluate the anticorrosive performance. BCN and carbon black addition enhanced the local electrochemical reactions and the barrier effects were promoted by an increased amount of zinc corrosion products (Zn5(OH)8Cl2 and ZnCO3). The formulation with 0.8 wt.% of spruce wood BCN performed equivalently well compared to the ones with carbon black. The degraded area and rust accumulation around the artificial scribe for the formulation with 0.8 wt.% of spruce wood BCN were 29.8% and 27.8% less than ZRP, respectively, which is attributed to the good electrical conductivity and high specific surface area of spruce wood char. These results suggest a promising and sustainable option for improving the anticorrosive performance of zinc-rich epoxy coatings by the incorporation of BCN.
AB - Biochar nanoparticles (BCN) derived from spruce wood and wheat straw were prepared, characterized and incorporated into zinc-rich epoxy coatings, with the aim of improving the zinc powder utilization and the anticorrosion performance. Formulations with different BCN and commercial carbon black dosages (0.4wt.%, 0.8wt.% and 1.6wt.%) were compared to a zinc-rich epoxy paint (ZRP) without carbon addition. After immersion and salt spray exposure, coated steel panels were characterized with optical, electrochemical and spectroscopy techniques to evaluate the anticorrosive performance. BCN and carbon black addition enhanced the local electrochemical reactions and the barrier effects were promoted by an increased amount of zinc corrosion products (Zn5(OH)8Cl2 and ZnCO3). The formulation with 0.8 wt.% of spruce wood BCN performed equivalently well compared to the ones with carbon black. The degraded area and rust accumulation around the artificial scribe for the formulation with 0.8 wt.% of spruce wood BCN were 29.8% and 27.8% less than ZRP, respectively, which is attributed to the good electrical conductivity and high specific surface area of spruce wood char. These results suggest a promising and sustainable option for improving the anticorrosive performance of zinc-rich epoxy coatings by the incorporation of BCN.
KW - Biochar nanoparticles
KW - Conductivity
KW - Corrosion
KW - EIS
KW - Zinc-rich epoxy coatings
U2 - 10.1016/j.porgcoat.2021.106351
DO - 10.1016/j.porgcoat.2021.106351
M3 - Journal article
SN - 0033-0655
VL - 158
JO - Progress in Organic Coatings
JF - Progress in Organic Coatings
M1 - 106351
ER -