Enhancing Corrosion Resistance Property of Mild Steel by Benzoxazine Synthesized from Vanillin and Copolymerize with Urethane

Abstract

Benzoxazine monomer prepared from vanillin and n-butylamine was characterized by 1H NMR, 13C NMR, FT-IR and UV visible spectroscopic techniques. The synthesized monomer was coated on the mild steel with isocyanate hardener in varying concentrations of isocyanate of the poly(VaBz-PU) and cured. The thermal properties of the monomer with and without isocyanate hardener were studied by TGA and DSC methods. The effect of various concentrations of isocyanate (PU) hardener with benzoxazine monomer on hardness, water absorption and gel absorption was investigated. Various concentrations of PU hardener with benzoxazine coating (VaBz-PU) on the mild steel were investigated by the electrochemical impedance and polarization studies. The study revealed that an increasing concentration of isocyante in the coating with benzoxazine increased their thermal, chemical and anticorrosive properties. The DFT calculations were also performed to support the anti-corrosive ability of the material.

Study of Corrosion Resistant Property of Benzoxazine Synthesised from Euginol with N-Butylamine and Copolymerised with Polyurethane on Mild Steel

“…The Biologic SP 300 model machine was used for the polarization studies; it has three electrodes, with Ag/AgCl serving as the reference electrode and Pt serving as the counter electrode; efficiency of corrosion was calculated from I corr value from Tafel extrapolation and the R ct value obtained from the Nyquist plot. [31][32][33][34][35][36][37][38][39]…”

“…The percentage of absorption of the water particles were calculated by weight difference. [31][32][33][34][35][36][37][38][39]…”

“…From the weight difference of the above two i.e., Wa and Wb the percentage of gel formation in the copolymer was calculated. 31,39…”

“…In order to minimize the health affect caused by the BPA monomer, now many researchers synthesized polybenzoxazine from bisguaicol-F 27 , cardanol 28 , sesamol 29 , curcumin 30 , guaicol 31 , eugenol 32,33 , vanillin 34,35 etc., Polyurethanes are produced by the reaction of isocyanates with polyols or suitable catalyst, which are widely used in industrial purposes due to its, good chemical resistance, flexibility, adhesion, etc., it is widely used in the anti-corrosive agent 36,37 and bio-medical applications 38 . In order to explore more polymeric materials as a corrosion inhibitor, we have reported vanillin based benzoxazines that is copolymerized with polyurethane shown a very good anti-corrosive on mild steel in marine environment 39 . In that series, we have reported the synthesis and the corrosion resistance behaviour of the synthesized eugenol-based benzoxazine which is co-polymerized with polyurethane.…”

Electrochemical assessment of the barrier ability of galvanic Zn coating primers electrodeposited on low-carbon steel

“…This, in turn, results in the smoothening of the deposited Zn film, highlighting the potential of this organic additive for further and more detailed research activities. Another anticipated advantage of introducing the organic compound is its potential corrosion inhibition effect, as elucidated in recent studies [26][27][28][29][30]. In alignment with these research trends, this brief study aims to assess the impact of benzalacetone addition on the performance of the resulting Zn galvanic films in diluted NaCl solutions.…”