Abstract:
Marine corrosion usually occurs due to the exposure of metal to marine environment. In
this study, the inhibitory action of tapioca starch on the corrosion of mild steels has been
investigated at four different concentrations (200ppm, 400ppm, 600ppm and 800ppm)
using weight loss method and EIS. The inhibition of the corrosion on mild steel by
tapioca starch powder in seawater solutions was study using immersion technique. Mild
steel plates tested using different concentration of tapioca starch powder and immersed
for 35 days. The characterization of the corrosion was tested by using potentiodynamic
polarization (PP), weight loss, electrochemical impedance spectroscopy (EIS), fourier
transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). The
percentage of inhibition efficiency (IE%) was calculated by using equation and this study
showed the corrosion rate increase by decreasing concentration of the tapioca starch.
Tapioca starch serves as an effective and non-toxic inhibitor of the corrosion on mild
steel.
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