الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
In order to create a self-healing painting system that would offer long-term protection, corrosion inhibitors have been added to paints. The phrase ”self-healing” refers to the material’s ability to restore its original qualities after being harmed by the outside environment. In order to actively suppress the corrosion process at the places with defects and actively combat corrosion of the underlying substrate, inhibitors are incorporated into the painting for an anticorrosion painting system.
Tannic acid, polyethylene glycol, and quaternary amine are organic compounds were investigated as corrosion inhibitors for AISI 1020 steel in by using potentiodynamic polarization technique. The metal surface behavior in presence and absence of these organic compounds has been characterized by X-ray diffraction, EDX and SEM. Results showed that tannic acid, polyethylene glycol, and quaternary amine are good friendly environmentally inhibitors for AISI 1020 carbon steel in 3% NaCl solution by forming protective film and blocking the available reaction sites exposed to the corrosive media. Inhibition efficiency increased by increasing the concentration of tannic acid, polyethylene glycol, and quaternary amine up to 40 ppm, 250 ppm and 75 ppm respectively then decreased. We found that using 40 ppm of tannic acid recorded the lowest value of corrosion rate lower than quaternary amine and polyethylene glycol at their best inhibition efficiency concentrations. The self-healing ability of the organic painting is supposed to be enhanced after introducing 40 ppm of tannic acid which is experimentally proven as the best inhibition efficiency concentration of tannic acid into polyamide cured epoxy primer to provide long-term protection for carbon steel AISI 1020 from further corrosion. Addition of 40 ppm of tannic acid increased the adhesion between paint and substrate to 400 (N/m2), the glossy increased to 67 GU, hardness also increased to 80 HL and the rating performance of scratched painting was (Rp / RA) 8 VS G.