Introducing rice husk after utilizing new technology as anticorrosive pigments in organic coatings

The aim of this study is to introduce rice husk after simple chemical modification as new eco-friendly anticorrosive pigments. Uncontrolled burning of rice husk is often considered the most disposal method in Egypt; this seasonal and highly localized massive burning generates excessive air pollution. The usage of this waste as anticorrosive pigments will decrease the danger of environment pollutions. The new anticorrosive pigments based on rice husk as core comprising 80-85% of new pigment covered with thin shell of ferrites that comprises about 15-20% were prepared using new technique called “core-shell”. The different ferrites/rice husk pigments were characterized using different analytical and spectro-photometric techniques, such as X-ray fluorescence (XRF), Energy dispersive X-ray (EDAX) and transmission electron microscopy (TEM). These core-shell pigments were then incorporated in solvent-based paint formulations based on epoxy resin. The physico-mechanical properties of dry films were tested. The corrosion properties using immersion test in 3.5% NaCl and electrochemical impedance spectroscopy (EIS) for 28 days were determined.