Effect of amorphous phytic acid nanoparticles on the corrosion mitigation performance and stability of sol-gel coatings on cold-rolled steel substrates

Highlights: • Novel amorphous phytic acid nanoparticles (PANPs) were prepared through a condensation reaction of PA with APTES. • The barrier property of PANPs doped silane coating is better than that of the undoped silane coating. • The doping of PANPs could greatly improve the durable performances of the sol-gel silane coatings in NaCl solutions. Amorphous phytic acid nanoparticles were prepared via a condensation reaction of phytic acid with aminopropyltriethoxysilane. X-ray photoelectron spectroscopy and fourier transform infrared characterizations demonstrated that there were abundant phosphate groups on the surface of as-prepared phytic acid nanoparticles. The advanced composite phytic acid nanoparticles doped silane sol-gel coating was fabricated on the cold-rolled steel substrates using sol-gel technique and introducing phytic acid nanoparticles into the coating. The results of electrochemical tests showed that the doping of phytic acid nanoparticles greatly improved the anti-corrosion and durable performances of the silane coatings. The simple strategy which utilized the "active" nanoparticles to improve the corrosion mitigation and durable performances of coating is expected to find wide application in the anti-corrosion coating industry.