Synthesis, characterization and protective efficiency of novel polybenzoxazine precursor as an anticorrosive coating for mild steel

Abstract

In this study, 2-[(E)-(hexylimino)methyl] phenol (SA-Hex-SF) was synthesized by adding salicylaldehyde (SA) and n-hexylamine (Hex-NH2), which was subsequently reduced by sodium borohydride to produce 2-[(hexylamino)methyl] phenol (SA-Hex-NH). Finally, the SA-Hex-NH reacted with formaldehyde to give a benzoxazine monomer (SA-Hex-BZ). Then, the monomer was thermally polymerized at 210 °C to produce the poly(SA-Hex-BZ). The chemical composition of SA-Hex-BZ was examined using FT-IR, 1H, and 13C NMR spectroscopy. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and X-ray Diffraction (XRD), respectively, were used to examine the thermal behavior, surface morphology, and crystallinity of the SA-Hex-BZ and its PBZ polymer. Mild steel (MS) was coated by poly(SA-Hex-BZ) which was quickly prepared using spray coating and thermal curing techniques (MS). Finally, the electrochemical tests were used to evaluate the poly(SA-Hex-BZ)-coating on MS as anti-corrosion capabilities. According to this study, the poly(SA-Hex-BZ) coating was hydrophobic, and corrosion efficiency reached 91.7%.

Construction of novel polybenzoxazine coating precursor exhibiting excellent anti-corrosion performance through monomer design

“…The poly(SA-Tol-BZ) coating, with its crosslinked network, demonstrated superior corrosion resistance ability compared to bare MS. According to Table S1 , our poly(SA-Tol-BZ) has the highest inhibition effect among other inhibitors in the same corrosive medium [ [42] , [43] , [44] , [45] , [46] , [47] , [48] , [49] , [50] , [51] , [52] , [53] , [54] , [55] ], suggesting that it is highly effective in inhibiting corrosion and holds great promise for anti-corrosive applications.

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Preparation of high‐performance hyperbranched polybenzoxazine with low dielectric constant

“…With high molecular design flexibility, polybenzoxazines can obtain various unique qualities based on the actual requirements, such as high thermal stability, [1][2][3] low surface energy, 4 flame retardancy, 5 anticorrosion, 6 low curing shrinkage, and dielectric constant. [7][8][9] Polybenzoxazines have potential as low dielectric constant (low-k) materials in the electronic information field.…”

Recent advances in bio-based polybenzoxazines as an interesting adhesive coating

“…[3][4][5][6] Furthermore, anticorrosion can be inhibited and reduced using some green nanoller to promote anticorrosion or by adopting some rules for anticorrosion inhibition. 7 Among all these polymer coatings, polybenzoxazine (PBZ) is a promising thermosetting resin used in various domains, including many advanced coating applications. 8 Researchers may be able to produce polymers with remarkable molecular structural exibility due to the intricate molecular structure of benzoxazines and the available varieties of phenolic and amino derivatives.…”

“… 3–6 Furthermore, anticorrosion can be inhibited and reduced using some green nanofiller to promote anticorrosion or by adopting some rules for anticorrosion inhibition. 7 …”