Synthesis Characterization and Protective Efficiency of Novel Polybenzoxazine Precursor as a Potential Corrosion Inhibitor for Mild Steel

Abstract In this study, salicylaldehyde (SA) and n-hexylamine (Hex-NH2) were used to produce 2-[(E)-(hexylimino)methyl] phenol (SA-Hex-SF), which was then reduced by sodium borohydride to obtain 2[(hexylamino)methyl]phenol (SA-Hex-NH), and finally the SA-Hex-NH reacted with formaldehyde to afford a new benzoxazine precursors (SA-Hex-BZ). Then, the poly(SA-Hex-BZ) was prepared through thermal curing polymerization of its monomer at of benzoxazine at 210 oC. The chemical structure of the SA-Hex-BZ was analyzed using FT-IR, 1H, and 13C NMR spectroscopy. The thermal properties, surface morphology and crystallinity of the SA-Hex-BZ and its PBZ polymer were studied by differential Scanning Calorimetric (DSC), TGA, scanning Electron Microscopy (SEM), and X-Ray analysis, respectively. poly(SA-Hex-BZ) was easily prepared on mild steel (MS) via spray painted and thermal curing methods. Finally, the electrochemical measurements were applied to measure the anticorrosion properties of MS coated with poly(SA-Hex-BZ). This work demonstrated that PBO coating was hydrophobic and had a high anticorrosion effect on MS with efficiency was 91.7%.