Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE Zn2+ combines with phytic acid polyaniline (PANI-PA@Zn) through an ionic bond, and the obtained PANI-PA@Zn has good dispersibility in waterborne epoxy coating. The synergistic effect between PANI and the doped zinc phytate can give the waterborne epoxy coating an excellent anticorrosion performance. The formed protective film on the carbon steel surface is a hybrid film composed of a passivation film and the complex of phytate.

ABSTRACT
A highly efficient organic–inorganic anticorrosion pigment was synthesized by adsorbing zinc ions onto polyaniline doped with phytic acid (PANI-PA@Zn) by ionic bond. PANI-PA@Zn demonstrates excellent thermal stability and dispersibility in waterborne epoxy coatings. The waterborne epoxy coating exhibited a remarkable anticorrosion performance with a low addition of PANI-PA@Zn. Incorporation of 6 wt% of PANI-PA@Zn, waterborne epoxy coating presented excellent anticorrosion and mechanical properties. After an 84-day immersion, the coating resistance was still maintained at 1011 Ω cm2. Furthermore, scanning Kelvin probe (SKP) analysis also confirmed its effective self-healing capability. The superior corrosion inhibition effect of PANI-PA@Zn came from the passivation of polyaniline and the chelating of zinc phytate groups in PANI. These findings suggested that PANI-PA@Zn was a promising high-performance anticorrosive pigment capable of providing waterborne epoxy coatings with exceptional long-term corrosion protection for industrial applications.