Azani, Nur Fatin Silmi Mohd
(2021)
Anticorrosion Properties Of Epoxy
Zinc Oil Palm Frond Cellulose
Nanocrystal Composite Coating For
Mild Steel Corrosion Protection.
Masters thesis, Perpustakaan Hamzah Sendut.
Abstract
Epoxy zinc (epoxy-Zn) coating has been widely used as corrosion protection.
However, the high porosity of epoxy-Zn is tend to drawback the barrier properties of
the coating. Thus, the surface modification of epoxy-Zn is imperative. This study
focused on effect of oil palm frond cellulose nanocrystal (OPF-CNC) as a reinforcing
nanofiller to improve epoxy-Zn barrier properties. In this work, OPF biomass was
utilised in preparing OPF-CNC by H2SO4 hydrolysis. OPF was initially pre-treated
with autohydrolysis pre-treatment. The surface analyses via transmission electron
microscopy (TEM) confirmed that the OPF-CNC is a nanofiller with an average length
and diameter of 95.09 and 6.81 nm, respectively. The anticorrosive performance of
epoxy-Zn coating and modified epoxy-Zn coating was investigated using
electrochemical analyses via electrochemical impedance spectroscopy (EIS),
potentiodynamic polarization (PD) and open circuit potential (OCP). The anticorrosive
performance and surface properties of modified epoxy-Zn (E-Zn-0.5) were compared
with commercial zinc chromate paint. It was revealed that E-Zn-0.5 has higher
inhibition efficiency (99 %) than commercial paint (70 – 80 %). Based on wettability
study, E-Zn-0.5 shows the highest hydrophobicity (100.5 ± 0.70°) than commercial
paint (91.04 ± 1.20°). The hardness test revealed that the coating’s hardness value for
E-Zn-0.5 is higher than commercial paint of 0.61 and 0.25 GPa, respectively. Thus,
the improved corrosion protection properties of epoxy-Zn with the addition of OPF CNC proof the potential of OPF biomass waste to be utilized as an alternative in
renewable green materials.
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